JP5782814B2 - Porous membrane processing apparatus and porous membrane processing method - Google Patents

Description

  The present invention relates to an apparatus for treating a porous membrane that treats the porous membrane with a chemical solution containing an oxidizing agent.

In recent years, due to increasing interest in environmental pollution and stricter regulations, a method using a porous membrane filtration membrane excellent in separation completeness and compactness has attracted attention as a water treatment method.
As a method for producing a porous membrane, a non-solvent phase separation method using a non-solvent phase separation phenomenon in which a polymer solution is made to be porous by phase separation with a non-solvent is known.
When producing a porous membrane using a non-solvent phase separation method, a film-forming stock solution containing a hydrophobic polymer, a hydrophilic polymer, and a solvent is discharged from a discharge port (spinning nozzle, T-die, etc.), and a coagulation liquid Solidify in to obtain a porous membrane precursor (hollow fiber etc.).
In the porous membrane precursor formed by the coagulation step, a large amount of hydrophilic polymer and solvent in the solution state remain. If a large amount of the hydrophilic polymer remains in the porous film obtained thereafter, the water permeability is impaired, and if the hydrophilic polymer is dried in the porous film, the mechanical strength of the film may be reduced. is there. Therefore, after the coagulation step, the hydrophilic polymer remaining in the porous membrane is usually immersed in a chemical solution containing an oxidizing agent such as hypochlorous acid, then heated to decompose, washed, and hydrophilic. A treatment for sufficiently removing the polymer is performed (Patent Documents 1 and 2).
In the above processing method, when heating the porous film after immersion in the chemical solution, for example, a heating container, heating means for heating the inside of the heating container, and a guide for running the porous film inside the heating container A heating device provided with a roll is widely used.

JP-A-2-302449 JP-A-2005-220202

However, when the porous membrane after immersion in the chemical solution is heated using a heating device equipped with a conventional heating container, the porous membrane is deformed (for example, when the porous membrane is a hollow fiber membrane, the diameter is reduced and flattened). ). The deformed porous membrane is excluded from the product because the desired performance is hardly obtained.
An object of this invention is to provide the porous membrane processing apparatus which can prevent the deformation | transformation of the porous membrane at the time of heating after chemical | medical solution immersion.

The present invention has the following aspects.
[1] A processing apparatus for a porous membrane used in a chemical treatment process for a porous membrane or a porous membrane precursor , wherein the porous membrane or the porous membrane precursor is immersed in a chemical solution containing an oxidizing agent. It has a chemical immersion part and a heating part that heats the porous film or porous film precursor after being immersed in the chemical liquid, and the heating part heats the heating container and the inside of the heating container And a guide means for causing the porous film or the porous film precursor to travel inside a heating vessel, the guide means being constituted by a guide roll comprising a free roll having a diameter of 80 mm or more .
[2] The porous membrane according to [1], wherein the bearing attached to the guide roll includes an outer ring and an inner ring made of polyetheretherketone, and a rotary bearing having a retainer made of fluororesin or surface-coated with fluororesin. Processing equipment.
[3] The porous membrane processing apparatus according to [2], wherein the rotary bearing has a silicon carbide ceramic ball bearing.
[4] The porous film processing apparatus according to any one of [1] to [3], wherein the heating container is made of titanium.
[5] The heating means is a steam ejection means provided near the bottom of the heating container, and a protective cover for protecting the heating means is provided between the heating means and the guide means. [1] The porous membrane processing apparatus according to any one of to [4].
[6] A method for treating a porous membrane used in a chemical treatment process for a porous membrane or a porous membrane precursor, wherein the porous membrane or the porous membrane precursor is immersed in a chemical solution containing an oxidizing agent. A chemical solution immersion step, and a heating step of heating the porous membrane or the porous membrane precursor after being immersed in the chemical solution. In the heating step, heating the heating container and heating the inside of the heating container Means and a heating unit comprising guide means for running the porous film or porous film precursor inside the heating container, the guide means is constituted by a guide roll composed of a free roll having a diameter of 80 mm or more, A porous membrane treatment method, wherein the relative humidity inside the heating container is 80% or more.
[7] The porous membrane treatment method according to [6], wherein the heating temperature in the heating step is set to 50 ° C. or higher.
[8] The porous membrane treatment method according to [6] or [7], wherein the temperature of the chemical solution in the chemical solution immersion step is set to 50 ° C. or less.

According to the porous membrane processing apparatus of the present invention, it is possible to prevent the porous membrane from being deformed, such as thinning and flattening when heated after immersion in the chemical solution.
In the porous membrane treatment apparatus of the present invention, if the bearing attached to the guide roll includes an outer ring and an inner ring made of polyetheretherketone, and a rotary bearing having a retainer made of fluororesin or surface-coated with fluororesin. Further, it is possible to prevent the porous membrane from being deformed.
Further, if the rotary bearing has a silicon carbide ceramic ball bearing, wear can be suppressed.
Moreover, if a heating container is made from titanium, corrosion resistance can be improved and generation | occurrence | production of rust can be suppressed.
Further, if the heating means is a steam jetting means provided near the bottom of the heating container and a protective cover for protecting the heating means is provided between the heating means and the guide means, the steam of the jetting means is provided. Blockage of the spout can be prevented.

It is a schematic diagram which shows one Embodiment of the porous membrane processing apparatus of this invention.

An embodiment of the porous membrane treatment apparatus of the present invention will be described as an example of the treatment of the hollow fiber membrane.
In FIG. 1, the schematic diagram of the porous membrane processing apparatus of this embodiment is shown. The porous film processing apparatus 1 of the present embodiment includes a chemical solution immersion unit 10, a heating unit 20, a cleaning unit 30, and a drying unit 40.

(Chemical solution immersion part)
The chemical solution immersion unit 10 in the present embodiment includes a treatment tank 11 in which the chemical solution B is placed, a guide unit 12 that guides the hollow fiber membrane A so that the hollow fiber membrane A is immersed in the chemical solution B multiple times, and a guide unit. 12, a cooling member 14 provided inside the processing tank 11, a chemical supply pipe 15 for supplying the chemical B to the processing tank 11, and a chemical discharge pipe for discharging the chemical B from the processing tank 11. 16.

In the treatment tank 11 in the present embodiment, the chemical solution B is supplied from the chemical solution supply pipe 15 and discharged from the chemical solution discharge pipe 16 so as to move from the downstream side in the transfer direction of the hollow fiber membrane A toward the upstream side. It has become.
Moreover, the processing tank 11 is made of a material having corrosion resistance, and titanium is particularly preferable. If the treatment tank 11 is made of titanium, the corrosion prevention effect is high and the generation of rust can be suppressed. Therefore, the deterioration of the treatment tank 11 can be suppressed, and the hollow fiber membrane A can be prevented from being damaged due to contact with rust.

A plurality of guide means 12 are provided such that a plurality of lower guide rolls 12a are provided so as to be positioned below the liquid surface 11a of the chemical solution B in the processing tank 11, and a plurality of guide means 12 are provided above the liquid surface 11a of the chemical solution B. And an upper guide roll 12b.
In the guide means 12, the hollow fiber membrane A is alternately wound around the lower guide roll 12 a and the upper guide roll 12 b to reverse the transfer direction, thereby transferring the hollow fiber membrane A while reciprocating in the vertical direction, The immersion of the hollow fiber membrane A in the chemical solution B and the pulling up of the hollow fiber membrane A from the chemical solution B are repeated. Thereby, the hollow fiber membrane A is immersed in the chemical solution B a plurality of times.

(Heating section)
In the present embodiment, the heating unit 20 includes a heating container 21, a heating unit 22 provided near the bottom of the heating container 21, and a guide for causing the hollow fiber membrane A to travel above the heating unit 22 inside the heating container 21. Means 23 and a protective cover 24 for protecting the heating means 22 are provided.

  The heating container 21 in this embodiment is a substantially rectangular parallelepiped container. The heating container 21 is made of a material having corrosion resistance, and titanium is particularly preferable. If the heating container 21 is made of titanium, corrosion resistance is high, so that the generation of rust due to the oxidizing agent contained in the hollow fiber membrane A can be suppressed, and deterioration of the heating container 21 can be suppressed. Moreover, it can prevent that rust falls and contacts the hollow fiber membrane A and is damaged.

  The heating means 22 in the present embodiment is composed of steam jetting means for jetting heating steam such as steam, and heats the inside of the heating container 21 with steam. In the present embodiment, a steam jetting unit in which a plurality of jet ports 22b are formed in a pipe 22a to which steam is supplied is used.

  The guide means 23 includes an upper guide roll 23 a disposed on the upper side of the heating container 21 and a lower guide roll 23 b disposed on the lower side of the heating container 21. A plurality of upper guide rolls 23a and lower guide rolls 23b are provided, and the hollow fiber membrane A is alternately wound around the upper guide rolls 23a and the lower guide rolls 23b. In such a guide means 23, the hollow fiber membrane A is transferred while reversing the transfer direction of the hollow fiber membrane A so as to reciprocate the hollow fiber membrane A in the vertical direction.

The upper guide roll 23a and the lower guide roll 23b are free rolls having a diameter of 80 mm or more, preferably 90 mm or more. Here, the free roll is a roll to which drive means such as a motor is not attached.
When the diameter of the upper guide roll 23a and the lower guide roll 23b is less than 80 mm, the tension applied to the hollow fiber membrane A when it is wound around the upper guide roll 23a and the lower guide roll 23b becomes too high, The thread membrane A may be thinned or flattened. In terms of practicality, the diameters of the upper guide roll 23a and the lower guide roll 23b are preferably 100 mm or less.
The bearings attached to the upper guide roll 23a and the lower guide roll 23b are made of a member having excellent scratch resistance such as, for example, polyetheretherketone (PEEK) resin, polyamide (PA) resin, polyimide (PI) resin. It is preferable to include an outer ring and an inner ring, and a rotary bearing having a retainer made of fluororesin or having a surface coated with fluororesin. Among these, since it is excellent in oxidant resistance, which will be described later, and is difficult to break even when a chemical solution containing an oxidant is used, it is preferable to use a polyether ether ketone resin for the outer ring and the inner ring. It is preferable to use tetrafluoroethylene (PTFE) resin.
If the bearing is as described above, it is difficult to wear, the bearing replacement frequency can be reduced, and an increase in tension due to poor rotation can be suppressed. And flattening) can be further prevented.
Examples of the rotary bearing include a ball bearing. In the case of using a ball bearing, it is preferable to use a ceramic, particularly a silicon carbide ceramic, for the bearing ball from the viewpoint of wear resistance.

  The protective cover 24 is provided between the heating means 22 and the guide means 23, and protects the heating means 22 so that falling objects from the hollow fiber membrane A traveling by the guide means 23 do not collide with the heating means 22. is there. The protective cover 24 covers only the upper part of the heating means 22 and does not cover the side surface side of the heating container 21. Therefore, the steam ejected from the ejection port 22 b of the heating means 22 can be diffused into the heating container 21.

  In the heating unit 20, the inside of the heating container 21 is heated by ejecting steam from the heating means 22, and the hollow fiber membrane A traveling by the guide means 23 can be heated in the gas phase. Further, the protective cover 24 can prevent the fallen object from the traveling hollow fiber membrane A from colliding with the heating means 22.

(Washing part)
The cleaning unit 30 in this embodiment includes a cleaning tank 31 in which the cleaning liquid C is placed, a first vacuum cleaning unit 32, a pressure cleaning unit 33, a second vacuum cleaning unit 34, and a guide roll 35. The first vacuum cleaning means 32, the pressure cleaning means 33 and the second vacuum cleaning means 34 are immersed in the cleaning liquid C in the cleaning tank 31. Further, the first reduced pressure cleaning means 32, the pressure cleaning means 33, and the second reduced pressure cleaning means 34 are arranged in this order from the upstream side.
Vacuum pumps 32a and 34a are connected to the first vacuum washing means 32 and the second vacuum washing means 34, and the outside of the hollow fiber membrane A is decompressed by the vacuum pumps 32a and 34a, so that the inside of the hollow fiber membrane A can be reduced. A hydrophilic polymer aqueous solution is discharged to the outside of the hollow fiber membrane A.
A pressurizing pump 33a is connected to the pressurizing and cleaning means 33, and the pressurizing pump 33a pressurizes the outside of the hollow fiber membrane A so that the cleaning liquid C is introduced into the hollow fiber membrane A from the outside of the hollow fiber membrane A. It comes to press fit.
The guide roll 35 is arranged so that the hollow fiber membrane A travels in the cleaning tank 31 and travels inside the first reduced pressure cleaning means 32, the pressure cleaning means 33 and the second reduced pressure cleaning means 34.

(Drying part)
The drying unit 40 is for drying the hollow fiber membrane A washed by the washing unit 30. Specifically, a hot air dryer, a vacuum dryer, etc. are mentioned.
A winding means such as a bobbin for winding the hollow fiber membrane A may be provided on the downstream side of the drying unit 40.

(Method of treating hollow fiber membrane)
An example of the processing method of the hollow fiber membrane using the said processing apparatus is demonstrated.
This processing example includes a chemical solution immersion process, a heating process, a cleaning process, and a drying process.

[Chemical processing process]
In the chemical treatment process, the hollow fiber membrane A in which the hydrophilic polymer remains is immersed in the chemical B.
Specifically, the chemical solution B is supplied to the treatment tank 11 through the chemical solution supply pipe 15, is discharged from the chemical solution discharge pipe 16, and is moved from the downstream side in the transfer direction of the hollow fiber membrane A toward the upstream side. Thereby, it becomes easy to make constant the oxidizing agent density | concentration in the hollow fiber membrane A after a chemical | medical solution immersion process.
At the same time, the hollow fiber membrane A is transferred while reciprocating between the lower guide roll 12a and the upper guide roll 12b. As a result, while the hollow fiber membrane A is traveling, the immersion of the hollow fiber membrane A into the chemical solution B and the pulling up of the hollow fiber membrane A from the chemical solution B are repeated, so that the chemical solution B penetrates into the hollow fiber membrane A.

  Examples of the oxidizing agent contained in the chemical solution B include ozone, hydrogen peroxide, permanganate, dichromate, and persulfate. Of these, hypochlorite is preferable from the viewpoints of strong oxidizing power, excellent decomposition performance, excellent handleability, and low cost. Examples of the hypochlorite include sodium hypochlorite and calcium hypochlorite. Among them, sodium hypochlorite is preferable.

The temperature of the chemical solution B is preferably 50 ° C. or less, and more preferably 30 ° C. or less. When the chemical temperature is 50 ° C. or lower, the reaction between the hydrophilic polymer remaining in the hollow fiber membrane A and the hydrophilic polymer dropped off from the hollow fiber membrane A and the oxidizing agent contained in the chemical solution B can be suppressed. Therefore, a sufficient amount of active oxidant can be retained in the hollow fiber membrane A transferred to the heating unit 20. The chemical solution B can be cooled using the cooler 14.
However, if the temperature is excessively low, the oxidative decomposition is suppressed, but the cost required for temperature control tends to increase. Therefore, the temperature of the chemical solution B is preferably 0 ° C. or higher, and more preferably 10 ° C. or higher.

In this example, the hollow fiber membrane was obtained by discharging a membrane forming stock solution containing a hydrophobic polymer, a hydrophilic polymer and a solvent for dissolving them from a spinning nozzle, coagulating with a coagulating solution, and washing as necessary. It may be a sufficiently porous film, or may be a precursor that is not sufficiently formed into a porous film.
The film-forming stock solution may be discharged onto the peripheral surface of the hollow string-like support fed from the spinning nozzle. As the hollow string-like support, a knitted string or a braided string can be used. Synthetic fibers, semi-synthetic fibers, regenerated fibers, natural fibers, and the like are examples of fibers constituting the braided or braided string. The form of the fiber may be any of monofilament, multifilament, and spun yarn.

Examples of the hydrophobic polymer include polysulfone resins such as polysulfone and polyethersulfone, fluorine resins such as polyvinylidene fluoride, polyacrylonitrile, cellulose derivatives, polyamide, polyester, polymethacrylate, and polyacrylate. Moreover, these copolymers may be sufficient. A hydrophobic polymer may be used alone or in combination of two or more.
Among the hydrophobic polymers, a fluorine-based resin is preferable from the viewpoint of excellent durability against an oxidizing agent such as hypochlorous acid, and a polyvinylidene fluoride or a copolymer of vinylidene fluoride and another monomer is preferable. .
The hydrophilic polymer is added to adjust the viscosity of the membrane-forming stock solution to a range suitable for the formation of the hollow fiber membrane and stabilize the membrane-forming state. Polyethylene glycol, polyvinyl pyrrolidone, etc. are preferable. used. Among these, polyvinylpyrrolidone and a copolymer obtained by copolymerizing other monomers with polyvinylpyrrolidone are preferable from the viewpoint of controlling the pore diameter of the hollow fiber membrane and the strength of the hollow fiber membrane.
Examples of the solvent include N, N-dimethylformamide, N, N-dimethylacetamide, dimethyl sulfoxide, N-methyl-2-pyrrolidone, N-methylmorpholine-N-oxide, and one or more of these can be used. Moreover, you may mix and use the poor solvent of a hydrophobic polymer or a hydrophilic polymer in the range which does not impair the solubility of the hydrophobic polymer or hydrophilic polymer to a solvent.

[Heating process]
In the heating step, the hollow fiber membrane A infiltrated with the chemical solution B is heated in the gas phase by the heating unit 20, and the hydrophilic polymer is oxidized and decomposed to reduce the molecular weight.
Specifically, first, steam such as water vapor is ejected from the ejection port 22b of the heating means 22, and the inside of the heating container 21 is heated by the steam. Next, the hollow fiber membrane A infiltrated with the chemical solution B is wound while being alternately wound around the upper guide roll 23a and the lower guide roll 23b, thereby being transferred while reciprocating in the vertical direction. Thereby, the hollow fiber membrane A which the chemical | medical solution B osmose | permeated runs inside the heated heating container 21, and is heated.

The relative humidity inside the heating container 21 is preferably 80% or more, more preferably 90% or more, and is preferably close to 100%, since drying of the oxidizing agent can be prevented and oxidative decomposition of the hydrophilic polymer can be promoted. Most preferred.
The lower limit of the heating temperature is preferably 50 ° C., more preferably 80 ° C., because the heat treatment time can be shortened. The upper limit of the heating temperature is preferably 100 ° C. in the atmospheric pressure state. Here, the heating temperature is the temperature in the heating container 21.

  As described above, in the heating step of the present embodiment in which the hollow fiber membrane A is heated in the gas phase, the hollow fiber membrane A in which the chemical solution B has permeated is caused to travel inside the heated heating container 21, thereby forming the hollow fiber. The hydrophilic polymer remaining in the film A is oxidatively decomposed by the oxidizing agent in the chemical solution B. In the heating step, the chemical solution B that has penetrated into the hollow fiber membrane A is difficult to dilute, and the chemical solution B is difficult to flow out into the heating medium, so that the oxidizing agent in the chemical solution B remains in the hollow fiber membrane A. It can be efficiently used for decomposing hydrophilic polymers.

[Washing process]
In the washing step, the hollow fiber membrane A is washed while passing through the first reduced pressure washing means 32, the pressure washing means 33, and the second reduced pressure washing means 34 to remove the hydrophilic polymer.
Specifically, the hollow fiber membrane A is caused to travel inside the first reduced pressure cleaning means 32, the pressure cleaning means 33 and the second reduced pressure cleaning means 34 in the cleaning tank 31 by the guide roll 35.
In the first reduced pressure washing means 32, the outside of the hollow fiber membrane A is decompressed by the vacuum pump 32a, thereby discharging the hydrophilic polymer aqueous solution inside the hollow fiber membrane A to the outside of the hollow fiber membrane A.
In the pressure washing means 33, the outside of the hollow fiber membrane A is pressurized by the pressure pump 33a, so that the washing liquid C is pressed into the hollow fiber membrane A from the outside of the hollow fiber membrane A, and the hydrophilic polymer is washed with the washing liquid C. Replace and dilute.
In the second reduced pressure washing means 34, the outside of the hollow fiber membrane A is again decompressed by the vacuum pump 34a, and the hydrophilic polymer aqueous solution inside the hollow fiber membrane A is discharged to the outside of the hollow fiber membrane A.
Thereby, the hydrophilic polymer is removed from the hollow fiber membrane A.

[Drying process]
There is no restriction | limiting in particular as a method of a drying process, Hot air drying, vacuum drying, etc. can be applied. After the drying step, the dried hollow fiber membrane A may be wound on a winding means such as a bobbin.

(Function and effect)
In the above-described embodiment, the chemical solution B is infiltrated into the hollow fiber membrane A at the chemical solution immersion unit 10, and the hollow fiber membrane A infiltrated with the chemical solution B is heated at the heating unit 20 to remain in the hollow fiber membrane A. The hydrophilic polymer is made to have a low molecular weight, and the washing unit 30 cleans the hollow fiber membrane A to remove the low molecular weight hydrophilic polymer.
Since the upper guide roll 23a and the lower guide roll 23b of the guide means 23 are free rolls having a diameter of 80 mm or more, the heating unit 20 has a hollow fiber membrane A when it is wound around the upper guide roll 23a and the lower guide roll 23b. The tension applied to the fiber can be suppressed, and the hollow fiber membrane A can be prevented from being reduced in diameter or flattened.
Further, the heating unit 20 is provided with a protective cover 24 between the heating means 22 and the guide means 23, and even if a hydrophilic polymer or the like falls from the hollow fiber membrane A, the protective cover 24 moves to the heating means 22. Can avoid collisions. Thereby, it can prevent that a fall thing obstruct | occludes the jet nozzle 22b of the heating means 22. FIG.

(Other embodiments)
In addition, this invention is not limited to the said embodiment.
For example, in the chemical solution immersion part, the hollow fiber membrane may not be repeatedly immersed in the chemical solution but may be immersed once. Moreover, you may move a chemical | medical solution from the upstream of the transfer direction of a hollow fiber membrane to the downstream.
Moreover, the heating part does not need to be provided with the protective cover. Moreover, a heating means may be provided in parts (for example, a side part, a ceiling part) other than the bottom part inside a heating container.
Moreover, although the washing | cleaning part in the said embodiment was equipped with the pressure reduction washing | cleaning means in the upstream and downstream of a pressure washing means, you may be only upstream or downstream. Moreover, you may further provide a pressure washing | cleaning means and a pressure reduction washing means downstream from the 2nd pressure reduction washing | cleaning means. Further, only the vacuum cleaning means or the pressure cleaning means may be used.
Further, the treatment apparatus of the present invention can be applied not only to a hollow fiber membrane but also to a flat membrane such as a film membrane.

  EXAMPLES Hereinafter, although an Example demonstrates this invention in detail, this invention is not limited by the following description.

[Example 1]
A porous hollow fiber membrane was produced as follows.
Into the container, 112.2 L of N, N-dimethylacetamide (DMAc, manufactured by Samson Fine Chemical Co.) as a solvent is charged, and 15.6 kg of PVP-K79 (polyvinylpyrrolidone) manufactured by Nippon Shokubai Co., Ltd. as a pore opening agent is charged. Then, 29.7 kg of PVDF301F (polyvinylidene fluoride) manufactured by Arkema, which is a film-forming resin, was added and mixed to prepare a film-forming stock solution, which was supplied to the spinning nozzle.
Further, a braided string (product name: M1205, manufactured by Mitsubishi Rayon) is used as a reinforcing support, and the spinning solution is supplied to the spinning nozzle simultaneously with the film-forming stock solution, and the film-forming stock solution is applied to the outside of the reinforcing support. Then, the membrane forming stock solution was coagulated in a coagulating solution (8% DMAc aqueous solution) kept at 80 ° C. to form a porous hollow fiber membrane. Further, the porous hollow fiber membrane is washed with a washing solution (hot water at 90 ° C.), removed from the pore-opening agent by heating after being immersed in hypochlorite (chemical solution immersion step, heating step), and dried. Got. A free roll having a diameter of 80 mm was used as a guide roll used in a process subsequent to the spinning nozzle (cleaning process, chemical solution dipping process, heating process, drying process).
In the treatment of the porous hollow fiber membrane in Example 1, irregularities such as thinning and flattening did not occur, and a porous hollow fiber membrane of good quality was stably obtained.

[Comparative Example 1]
The treatment of the porous hollow fiber membrane in the same manner as in Example 1 except that the guide roll used in the subsequent steps (washing step, chemical solution dipping step, heating step, drying step) from the spinning nozzle was a free roll having a diameter of 50 mm. Went.
In the processing of the porous hollow fiber membrane in Comparative Example 1, the diameter of the free roll was set to 50 mm, so that the process tension became too high, causing quality troubles such as narrowing and flattening of the porous hollow fiber membrane. It was.

DESCRIPTION OF SYMBOLS 10 Chemical solution immersion part 11 Processing tank 11a Liquid level 12 Guide means 12a Lower guide roll 12b Upper guide roll 13 Support member 14 Cooler 15 Chemical solution supply pipe 16 Chemical solution discharge pipe 20 Heating part 21 Heating container 22 Heating means 22a Piping 22b Spout 23 Guide means 23a Upper guide roll 23b Lower guide roll 24 Protective cover 30 Cleaning part 31 Cleaning tank 32 First vacuum cleaning means 32a Vacuum pump 33 Pressure cleaning means 33a Pressure pump 34 Second vacuum cleaning means 34a Vacuum pump 35 Guide roll A Hollow fiber membrane B Chemical solution C Cleaning solution

Claims (8)

An apparatus for treating a porous membrane used in a chemical solution treatment step of a porous membrane or a porous membrane precursor,
A chemical solution immersion part for immersing a porous film or a porous film precursor in a chemical solution in a chemical solution containing an oxidizing agent, and a heating unit for heating the porous film or porous film precursor after being immersed in the chemical solution Have
The heating unit includes a heating container, heating means for heating the inside of the heating container, and guide means for causing the porous film or the porous film precursor to travel inside the heating container,
The said guide means is a porous membrane processing apparatus comprised by the guide roll which consists of a free roll with a diameter of 80 mm or more.   The porous film processing apparatus according to claim 1, wherein the bearing attached to the guide roll includes an outer ring and an inner ring made of polyetheretherketone, and a rotary bearing having a retainer made of fluororesin or having a surface coated with fluororesin.   The porous film processing apparatus according to claim 2, wherein the rotary bearing has a silicon carbide ceramic ball bearing.   The porous membrane processing apparatus according to claim 1, wherein the heating container is made of titanium.   The heating means is a vapor ejection means provided near the bottom of a heating container, and a protective cover for protecting the heating means is provided between the heating means and the guide means. The porous membrane processing apparatus of any one of Claims. A method for treating a porous membrane used in a chemical treatment process for a porous membrane or a porous membrane precursor,
A chemical solution immersion step of immersing a porous film or a porous membrane precursor in a chemical solution in a chemical solution containing an oxidizing agent, and a heating step of heating the porous film or the porous membrane precursor after being immersed in the chemical solution; Have
In the heating step, using the heating unit including a heating container, a heating unit that heats the inside of the heating container, and a guide unit that causes the porous film or the porous film precursor to travel inside the heating container, the guide The means is constituted by a guide roll composed of a free roll having a diameter of 80 mm or more,
A porous membrane treatment method, wherein the relative humidity inside the heating container is 80% or more. The porous membrane treatment method according to claim 6, wherein the heating temperature in the heating step is 50 ° C. or higher. The porous membrane treatment method according to claim 6 or 7, wherein the temperature of the chemical solution in the chemical solution immersion step is set to 50 ° C or lower.

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