JPH02144117A - Gas separation composite membrane module - Google Patents

Abstract

PURPOSE:To prevent a decrease in the oxygen content of oxygenenriched air by covering the edge along the module frame of a gas separation composite membrane with a tape-shaped sealing member, and bonding the membrane to the frame. CONSTITUTION:The edge along the module frame 6 of the gas separation composite membrane is covered with the tape-shaped sealing member 14, and the membrane is bonded to the frame 6. When the inside of a fluid discharge port 6a is evacuated by a vacuum pump, the inside of the frame 6 is depressurized, and a differential pressure is generated in the gas separation membrane 11 through an air-permeable member 5, a fibrous reinforcing material 13, and a porous support 12. Accordingly, a specified gas such as oxygen in the gas outside the module is passed through the membrane 11, and selectively separated. The separated gas passes through the support 12, enters a space formed by an air-permeable member 4, and is discharged from the discharge port 6a as a separated gas (oxygen-enriched air).

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a gas separation composite membrane module using a gas separation membrane that selectively separates a specific gas from a mixed gas.

BACKGROUND OF THE INVENTION In recent years, many gas separation membranes for use with organic polymers have been proposed. In particular, attention is being paid to the practical application of a technique that uses such a gas separation membrane to selectively separate oxygen from air to obtain an oxygen-enriched gas.

If oxygen from the air can be efficiently and inexpensively separated and concentrated, it is expected to make a significant contribution to fields such as combustion, sludge treatment, and health and medical equipment.

The oxygen separation membrane ° has a large function of selectively separating oxygen from a mixed gas such as air and a function of efficiently permeating oxygen, that is, it has a large oxygen selection coefficient and oxygen permeability coefficient. desired.

Generally, the following relationship holds true regarding the amount of gas permeation through a homogeneous membrane.

q,: permeation amount of gas i (cc) Pl ・Gas permeability coefficient (CC-CTIl/cId・sec・
cmllg) ΔP1: Partial pressure difference (c
mHg) t: Transmission time (sec) A: Membrane area (ci)! , film thickness (what) Therefore, the thinner the film thickness l is, the more gas can pass through the film.

One way to obtain such a thin gas separation membrane is to
A method has been proposed in which an organic polymer dissolved in a solvent is spread on the water surface to form a thin polymer film, and this is supported on a porous support (Japanese Patent Laid-Open No. 56-92926).

When the membrane thickness l is reduced in this way, the gas separation membrane alone cannot provide mechanical strength, so it is usually supported on a porous support as described above, or the membrane material dissolved in a solvent is used on the water surface. It is spread on a porous support and supported on a porous support.

In a gas separation composite membrane in which a gas separation membrane is supported on a porous support, the characteristics of the gas separation membrane itself (selectivity, flow ff1) as well as the characteristics of the gas separation membrane can be sufficiently secured. Existence is important. For the applicant,
As a gas separation composite membrane with good initial properties,
A structure with a dense layer and a hollow layer with a porosity of 50 to 80% to reduce pressure loss, and a structure in which a gas separation membrane is laminated on a porous support with a fibrous reinforcing material is studied. (Patent Application No. 132524/1982).

Hereinafter, the above-mentioned conventional example and the example studied by the applicant will be explained using the drawings.

FIG. 3 is a cross-sectional view of the gas separation composite membrane.

In the figure, 1 is a gas separation membrane that selectively separates a desired gas from a mixed gas, and 2 is a porous support supporting the gas separation membrane 1, which has a dense layer 2a and a cavity layer 2b. The porosity is 50-80%.

These constitute a gas separation composite membrane.

3 is a fibrous reinforcing material which is used to reinforce the porous support 2.

FIG. 4 is a sectional view of an example of the structure of a device in which this gas separation composite membrane is modularized.

In the figure, 4 is a breathable member that supports the gas separation composite membrane and conveys the degree of vacuum, 5 is a double-sided adhesive tape that keeps the gas separation composite membrane airtight, 6 is a module frame that forms the outer wall, and 6a is a guide for separating gas. This is a fluid discharge port.

In this gas separation composite membrane module, when the inside of the fluid discharge port 6a is suctioned under reduced pressure with a vacuum pump, the inside of the module frame 6 is brought into a reduced pressure state, and the dense layer 2 of the porous support 2
A pressure difference is generated in the gas separation membrane 1 via the a1 cavity layer 2b and the breathable member 5. Due to this pressure difference, a specific gas, such as oxygen, is selectively separated from the gas outside the gas separation composite membrane through the gas separation membrane 1, and the dense layer 2a and the hollow layer 2b of the porous support 2 are separated from the nonwoven fabric 3. The air enters the space formed by the breathable member 4, and is taken out as a separated gas (oxygen-enriched air) from the fluid outlet 6a.

Problems to be Solved by the Invention However, in the above-mentioned conventional example, the dense layer 2a and the hollow layer 2b of the porous support 2 exhibit air permeability only in the direction perpendicular to the membrane surface, and have poor air permeability in the horizontal direction. shows no air permeability. However, since the nonwoven fabric used as the fiber reinforcing material 3 is breathable both vertically and horizontally, simply gluing the bottom surface of the nonwoven fabric 3 with double-sided adhesive tape 5 as shown in FIG. 4 will prevent air from leaking. The concentration of the selectively separated gas (oxygen-enriched air) will decrease.

Another possibility is to use an organic solvent-based adhesive to cover the edge of the gas separation composite membrane, but in this case, the adhesive will flow onto the surface of the gas separation composite membrane, narrowing the membrane area. or attack the gas separation membrane.

Further, the method of impregnating the end face portion of the fibrous reinforcing material with an organic polymer has the disadvantage that the process becomes complicated.

Means for Solving the Problems The gas separation composite membrane module of the present invention has a tape-shaped sealing member that covers the edge portion of the gas separation composite membrane along the module frame or supporting plate. and a module frame or support plate are glued together.

Function: With this configuration, there is no air permeability in the direction parallel to the gas separation membrane, so there is no leakage of air, and there is no decrease in the oxygen concentration of the oxygen-enriched air.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 2 is a cross-sectional view of the gas separation composite membrane used in this example.

In the figure, 11 is a gas separation membrane that selectively separates a mixed gas, and 12 is a porous support. In the porous support 12, 12a is a dense layer with a smooth surface, and the gas separation membrane 11 is formed on the surface. 12b is a hollow layer that reduces pressure loss of the porous support 12. 13
is a fibrous reinforcing material for reinforcing the porous support 12, which is laminated or coated with the porous support 12.

To explain this gas separation composite membrane in detail, it is made of polyether sulfone resin (I
CI company's product name rVic1, rex.

A 15 wt.
Washed with water and dried.

By this method, a porous support having a dense layer with a pore diameter of 0.2 μn1 or less and a hollow layer with a pore diameter of 0.5 to 10 μm, and a total porosity of 77%, is coated on a nonwoven fabric. A porous support was obtained.

A 2% by weight benzene solution (containing 5% by weight of tetrahydrofuran) of a copolymer of polydimethylsiloxane, polyhydroxynuthylene, and polysulfone is spread on the water surface to form a thin film, and then a thin film is formed on the porous support. A gas separation composite membrane was prepared by laminating layers to form a gas separation membrane. The properties of this gas separation composite membrane are shown in Table 1.

Table 1 The structure of this example, in which the above gas separation composite membrane is modularized, is shown in FIG.

In the figure, 11 is a gas separation membrane, 12a is a dense layer of the porous support 12, 12b is also a hollow layer, and 13 is a fibrous reinforcing material, which has the same structure as the gas separation composite membrane shown in Figure 2. It is. 4 is a breathable member, 6 is a module frame, 6
a is a fluid outlet, which is structurally the same as the device shown in FIG.

Reference numeral 14 denotes a tape-shaped sealing member that adheres the gas separation composite membrane and the module frame 6 so as to cover the edge portion of the gas separation composite membrane along the module frame 6. In addition, if the gas separation composite membrane and the module frame 6 are bonded on the same plane with the tape-shaped sealing member 14 without any difference in level, workability is improved.
There is no air leakage, and the reliability of the adhesion is improved.

As the tape-shaped sealing member 14, a polyester adhesive tape ("Sony Hontape Grade T4080J" manufactured by Sony Corporation) was used.

This is because polydimethylsiloxane, which is the main component of the gas separation@11, is used as a release agent, so a silicone-based adhesive is used for the tape-shaped seal member 14. In this way, by using an adhesive made of the same material as the membrane component of the gas separation membrane 11, it is possible to bond without causing air leakage. Additionally, the peel adhesion strength at temperatures within the range of -10℃ to 40℃ is 450 g/2c.
m ~ 400 g / 2 an (measurement speed: 300 m
m/min), and it was confirmed that the peel adhesion strength did not decrease even under high temperatures, and it was found that there was no problem in applying it to a gas separation composite membrane module.

In the present invention, bonding the gas separation composite membrane to the module frame 6 so as to cover the edge portion of the gas separation composite membrane along the module frame 6 with the tape-shaped sealing member 14 refers to the process shown in FIG. This means adhering the porous support 12 of the gas separation composite membrane so that air does not leak from the end.

In this gas separation composite membrane module, when the inside of the fluid discharge port 6a is vacuum-suctioned with a vacuum pump, the inside of the module frame 6 is brought into a reduced pressure state, and the air-permeable member 5. Fibrous reinforcement 13. A pressure difference is generated in the gas separation membrane 11 through the porous support 12 . When a pressure difference occurs across the gas separation membrane 11, a specific gas, such as oxygen, is selectively separated from the gas outside the gas separation composite membrane module through the gas separation membrane 11.
The separated gas (
oxygen-enriched air).

Table 2 shows actual measured values and calculated values based on the performance values in Table 1 when the gas separation composite membrane of the example of the present invention was modularized. In addition, actual measured values for the conventional example are also shown for comparison.

As is clear from the upper table of Table 2, since the actual measured values and calculated values of this example are almost equal, it is considered that there is no leakage of gas from the bonding surface or the like.

In other words, simply adhering the gas separation composite membrane to the module frame 6 so as to cover the part along the module frame 6 using the tape-shaped sealing member 14 is enough to ensure sufficient cooling and prevent leakage in the direction parallel to the membrane surface. It can be concluded that there is no.

In the present invention, the gas separation composite membrane is bonded to the module frame 6 using the tape-shaped seal member 14, but a plate-shaped member such as a support plate may be used instead of the module frame.

According to this embodiment, the gas separation composite membrane is bonded to the Modineal frame or support plate so that the part along the Modineal frame or support plate is covered with a tape-shaped sealing member, so that the membrane surface is On the other hand, there was no air leakage in the vertical direction, and the performance was almost the same as the calculated value from the performance values in Table 1. In addition, since there is no level difference between the module frame and the gas separation composite membrane, by embedding it within the module frame, the adhesive process is easy and the cost of bonding is low, resulting in an inexpensive gas separation membrane module. can be obtained.

Effects of the Invention According to the gas separation composite membrane module of the present invention, the gas separation composite membrane is adhered to the module frame or support plate by covering the part along the module frame or support plate with a tape-shaped sealing member. Therefore, there is no leakage of air in the direction perpendicular to the membrane surface, and there is no fear that the oxygen concentration of the oxygen-enriched air will decrease.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a gas separation composite membrane module according to an embodiment of the present invention, and FIG. 2 is a sectional view of a gaseous till composite membrane used in this embodiment. Figure 3 is a cross-sectional view of a conventional gas separation composite membrane, and Figure 4 is a cross-sectional view of a conventional gas separation composite membrane.
FIG. 2 is a sectional view of a gas separation composite membrane module obtained by modularizing the gas bone@composite membrane shown in the figure. 11... Gas separation membrane, 12... Porous support, 12a... Dense layer of porous support, 1
2b... Cavity layer of porous support, 13...
...Fibrous reinforcing material, 14... Tape-shaped sealing member. Name of agent: Patent attorney Shigetaka Awano and 1 other person 11-One-sheet material wholesale blasphemy I2゛-Multi-Xl tribute rice 13-～- 衾f-saka Lu Zishiro Op; oval ryo → Shiki p material 14- --Tape 4 great master GP talents/?

Claims (3)

[Claims] (1) It has a tape-shaped composite gas separation membrane that selectively separates the atmosphere or a mixed gas, a breathable member that supports the gas separation composite membrane from the inside, and a module frame or support plate that forms an outer wall. The gas separation composite membrane and the module frame or the support plate are bonded together with a sealing member so as to cover an edge portion of the gas separation composite membrane along the module frame or the support plate. Characteristic gas separation composite membrane module. (2) The gas separation composite membrane module according to claim 1, wherein the gas separation composite membrane and the module frame or support plate are juxtaposed with no difference in level and are bonded together with a tape-shaped sealing member. (3) The gas separation composite membrane module according to claim 1, wherein at least one component in the adhesive of the tape-shaped seal member is the same material as the main component of the gas separation membrane.