JPH0641664B2 - Chemical processing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention is an apparatus for treating a chemical liquid by immersing an object to be treated such as a plastic film or a cloth in a treatment tank containing a treatment liquid composed of a plurality of chemical liquids. In particular, the present invention relates to a chemical liquid processing device capable of automatically controlling the supply amount of each chemical liquid.

(Prior Art) For example, a chemical treatment such as desizing or bleaching is performed as a finishing process for a plastic film, a cloth, a fiber, or the like. Such a chemical treatment is performed by continuously immersing a strip-shaped object to be treated such as cloth in a treatment tank containing a chemical such as a desizing agent and a bleaching agent. The surplus chemical liquid in the processed material is
It is removed by the pressing roller. In order to keep the quality of the chemical treatment product constant, it is necessary to keep the chemical concentration in the treatment tank constant at all times. When the concentration of the treatment liquid changes, the continuously processed object cannot be uniformly processed, resulting in a change in quality.

Conventionally, a plurality of chemicals have been once charged into the spare tank as the treatment liquid and adjusted to a predetermined concentration. Such an adjustment method requires a large reserve tank to adjust the concentration of the treatment liquid; when the treatment liquid is treated with the chemical liquid in the treatment tank and the concentration of the treatment liquid changes, the treatment target It is not easy to adjust the treatment liquid to a predetermined concentration without interrupting the treatment of the substance; the treatment conditions are changed and the type and prescription (composition ratio) of the chemical liquid
In case of change, it is necessary to newly adjust the processing liquid in the spare tank; multiple chemical liquids must be mixed, so if the main agent decomposes or precipitates during mixing, However, there was a problem that a stable concentration could not be obtained.

Recently, with the development of sensors and computers, conductivity meter, pycnometer, constant current polarization potentiometer, etc. are used to detect the chemical concentration in the treatment tank, and the deviation from the preset chemical concentration is detected. A method has been developed in which the chemical solution required to solve the problem is directly supplied to the processing tank. According to this method, a large spare tank is unnecessary, and the concentration can be adjusted even if the concentration changes during the chemical treatment. Further, when the type of chemical liquid is changed due to the change of the processing condition, the chemical liquid to be fed into the processing tank may be changed, but it is not easy to deal with it when the composition ratio of each chemical liquid is changed. Furthermore, if the main agent decomposes / precipitates when the chemicals are mixed, it is difficult to stably adjust the concentration of the treatment liquid.

(Problems to be Solved by the Invention) The present invention is to solve the above-mentioned conventional problems, and an object thereof is to stabilize the treatment liquid in a treatment tank at a desired concentration when treating an object with a chemical solution. The purpose of the present invention is to provide a chemical treatment device that can be adjusted in a mechanical manner. Another object of the present invention is to provide a chemical liquid processing apparatus that can easily adjust the concentration of the processing liquid even when the composition ratio of the chemical liquid is changed.

(Means for Solving Problems) In the present invention, in a device for treating a chemical solution by continuously immersing an object to be treated in a treatment tank containing a treatment solution composed of a plurality of chemical solutions, each chemical solution is circulated. A chemical solution supply pump for supplying the chemical solution to the treatment tank via a liquid, a concentration detector for a predetermined chemical solution in the treatment solution, a concentration setter for setting the concentration of the chemical solution in the treatment solution, and A chemical liquid ratio setter that sets the composition ratio, and calculates the supply amount of the chemical liquid necessary to eliminate the deviation between the chemical liquid concentration by the concentration detector and the set concentration by the concentration setter. Based on the set composition ratio of the chemical liquid ratio setting device, the other chemical liquid supply amount is calculated, and the arithmetic controller for controlling each chemical liquid supply pump to the calculated supply amount. The above purpose is achieved by that. .

(Examples) Examples of the present invention will be described below.

As shown in FIG. 1, the chemical liquid processing apparatus of the present invention has a processing tank.
11, chemical liquid tanks 21, 22, 23, and chemical liquid pumps 31, 32 for feeding the chemical liquids stored in these tanks to the processing tank 11,
With 33.

The processing bath 11 contains a processing liquid composed of the chemicals in the chemical liquid tanks 21, 22, and 23. The treatment liquid is used, for example, for desizing and refining a cloth. This processing tank 11 is
It is connected to the chemical liquid tanks 21, 22 and 23 via the circulation path 12. A circulation pump 51 for circulating the processing liquid is arranged in the circulation path 12. The circulation path 12 is further provided with mixers 41 and 42 so that the chemicals in the chemical solution tank are sequentially and uniformly mixed in the circulation path 12. In the circulation path 12, a filter 52 for filtering the solid content from the processing tank 11 is installed, for example, between the processing tank 11 and the circulation pump 51. The circulation path 12 is also provided with a concentration detector 60 for continuously detecting the concentration of a predetermined chemical liquid (for example, sodium hydroxide in this embodiment) in the treatment liquid.

The chemical liquid tanks 21, 22, and 23 contain the chemical liquids necessary for smelt refining. For example, the chemical liquid tanks 21 have sodium hydroxide 21
However, auxiliaries A and B are stored in the chemical liquid tanks 22 and 23, respectively. As the auxiliary A, for example, a nonionic nonionic compound (for example, polyoxyethylene alkylphenyl ether) is used, and as the auxiliary B, for example, a nonionic organosilicon compound as a softening agent is used.

The circulation path 12 is provided with a tank 54 for discharging excess processing liquid to the outside of the system. The discharge of the processing liquid to the tank 54 is performed via the flow rate control valve 53. Water is supplied to the treatment tank 11 via the flow control valve 56, and the concentration of the treatment liquid in the treatment tank 11 is adjusted by the amount of water supplied.

The processing concentration in the processing tank 11 is continuously controlled by the arithmetic and control unit 70. The output of a concentration detector 60 for detecting the sodium hydroxide concentration of the treatment liquid circulated from the treatment tank 11 through the circulation path 12 is input to the arithmetic and control unit 70. The arithmetic and control unit 70 is also provided with the output of a concentration setting device 72 for setting the sodium hydroxide concentration of the treatment liquid to a desired value. Further, the arithmetic controller 70 is also supplied with the output of a chemical liquid ratio setting device 72 for setting the composition ratio of the treatment liquid of sodium hydroxide and the remaining auxiliary agents A and B.

On the other hand, the output of the arithmetic and control unit 70 is given to chemical liquid pumps 31, 32, and 33 that supply the chemical liquids in the chemical liquid tanks 21, 22, and 23 from the circulation path 12 into the processing tank 11. Therefore, the arithmetic controller 70 can control the supply amount of each chemical liquid pump 31, 32, 33. The output of the arithmetic and control unit 70 is discharged to the circulation pump 51 for circulating the treatment liquid, the flow control valve 56 for adjusting the amount of water supplied to the treatment tank 11, and the treatment liquid tank 54 in the treatment tank 11. Each is provided to a flow control valve 53 that controls the amount. Therefore, the arithmetic and control unit 70 can control the circulation flow rate of the processing liquid by the circulation pump 51 and the flow rates of the flow rate control valves 56 and 53, respectively.

In the chemical liquid processing device having such a configuration, the arithmetic controller 70 is
First, by controlling the chemical liquid pumps 31, 32, 33 and the flow rate control valve 56 for adjusting the amount of water, sodium hydroxide, auxiliary agent A,
B and water are supplied to the treatment tank 11 in predetermined amounts,
A treatment solution having a predetermined concentration is prepared. Then, in the treatment liquid,
For example, the cloth is continuously dipped, and the cloth is subjected to a glue plate refining treatment. Then, if the treatment liquid concentration fluctuates during the glue plate refining process, the arithmetic controller 70 performs control for concentration adjustment.

The control by the arithmetic and control unit 70 is performed as follows. In the arithmetic controller 70, the sodium hydroxide concentration in the treatment liquid is preset by the concentration setting device 71, and the chemical liquid ratio setting device 72
In, the composition ratio of sodium hydroxide and each of the auxiliary agents A and B is set. This composition ratio is, for example, 100% of sodium hydroxide, 10 and 10 of the respective auxiliaries A and B, respectively.
Is set.

The arithmetic and control unit 70 first continuously detects the sodium hydroxide concentration in the treatment liquid flowing through the circulation path 12 by the concentration detector 60, and detects the detected concentration and the water set by the concentration setting unit 71. The deviation of the detected concentration from the set concentration is calculated by comparing with the sodium oxide concentration. Next, the arithmetic controller 70 calculates the amount of sodium hydroxide required to eliminate the deviation,
The chemical liquid pump 31 is controlled so that the calculated amount becomes the supply amount. Further, the arithmetic and control unit 70 makes the auxiliary agents A and B correspond to the composition ratios of the respective chemical liquids set by the chemical liquid ratio setting unit 72 based on the calculated supply amount of sodium hydroxide.
Calculate the supply amount of. In other words, the composition ratio of each of the auxiliaries A and B is 10 and 100 for sodium hydroxide, respectively.
Since the calculated supply amount of sodium hydroxide is 10, the supply amount of each auxiliary A and B is 1
/ 10 and 1/10. The arithmetic and control unit 70 controls the chemical liquid pump 32 so that the supply amount of each of the auxiliary agents A and B becomes the calculated amount.
And 33 continuously controlled.

The sodium hydroxide fed from the chemical pump 31 is fed into the circulation path 12 and mixed with the treatment liquid in the mixer 41. Then, the treatment liquid mixed with sodium hydroxide is
Auxiliary agents A and B delivered from the chemical pumps 32 and 33
And mixed by a mixer 42 and charged into the processing tank 11.

When the prescription (composition ratio) of sodium hydroxide and each drug A and B is changed, the composition ratio is newly set by the drug solution ratio setting device 72, and the processing amount of each drug pump 31-33 is the same. The treatment liquid is changed according to the set ratio, and the processing liquid is promptly made to have a predetermined composition ratio.

FIG. 2 is a schematic view of another embodiment of the present invention. This example relates to an apparatus for bleaching a fabric with hydrogen peroxide. Hydrogen peroxide (H ₂ O ₂ ) is stored in the chemical liquid tank 24, and auxiliary agents E and F are stored in the chemical liquid tanks 25 and 26, respectively. The chemical solution tank 27 contains sodium hydroxide, the chemical solution tank 28 contains sodium silicate (Na ₂ SiO ₃ ), and the chemical solution tank 29 contains an auxiliary agent G. As the auxiliary agent E, for example, a nonionic nonionic compound is used, and as the auxiliary agent F, for example, a nonionic organosilicon compound as a softening agent is used. Further, as the auxiliary agent G, for example, a nonionic organic fluorine compound as a water repellent agent is used.
The chemical liquids in the chemical liquid tanks 24 to 29 are fed from the circulation path 12 to the processing tank 11 by the chemical liquid pumps 34 to 39, respectively. A mixer is appropriately arranged in the circulation passage 12 so that when the chemical liquid in each of the chemical liquid tanks is supplied to the treatment tank 11 through the circulation passage 12, the respective chemical liquids are sequentially and uniformly mixed in the circulation passage 12. For example, the chemical solution fed by the chemical solution pumps 34 and 35 is mixed with the processing solution in the circulation path 12 by the mixer 44. The chemical liquids sent by the chemical liquid pumps 36 to 39 are respectively mixed in the mixer.
At 45 to 48, they are mixed with the processing liquid in the circulation path 12, respectively.
The chemical liquid pumps 34 to 39 are controlled by the arithmetic controller 70, respectively.

The circulation path 12 has a concentration detector 60 for continuously detecting the concentration of sodium hydroxide in the treatment liquid, and a redox potential measurement for continuously detecting the concentration of hydrogen peroxide in the treatment liquid. A device 61 is provided, and the detection result of the redox potential measuring device 61 is input to the arithmetic controller 70 '. In addition to the concentration setter 71a for setting the concentration of sodium hydroxide in the treatment liquid, the arithmetic controller 70 'is also connected to the concentration setter 71b for setting the concentration of hydrogen peroxide in the treatment liquid. Has been done. Further, the arithmetic controller 70 'includes two chemical liquid ratio setting devices 72a.
And 72b are connected.

In this embodiment, the composition ratio of the auxiliary agent F and sodium silicate is set for sodium hydroxide, and the composition ratio of the auxiliary agents E and G is set for hydrogen peroxide. For example, sodium hydroxide is 5 and auxiliary agent F is
10, the ratio of sodium silicate is set to 10 by the chemical liquid ratio setting device 72a, and hydrogen peroxide is 20:
Auxiliary agent E is 10 and auxiliary agent G is 10
It is set at 72b.

The arithmetic and control unit 70 'compares the sodium hydroxide concentration set by the concentration setting unit 71a with the sodium hydroxide concentration in the treatment liquid detected by the concentration detector 60, and compares the detected concentration with the set concentration. Calculate the deviation. Then, the amount of sodium hydroxide required to eliminate the deviation is calculated, and the chemical liquid pump 37 is continuously controlled so that the salt mountain amount becomes the supply amount. Further, the arithmetic controller 70 'calculates the supply amount of sodium silicate and the auxiliary agent E in accordance with the composition ratio set by the chemical liquid ratio setting device 72a based on the calculated sodium hydroxide supply amount, The chemical liquid pumps 38 and 39 are continuously controlled so that the calculated amount becomes the supply amount.

On the other hand, the arithmetic controller 70 'detects the concentration of hydrogen peroxide from the redox potential in the treatment liquid measured by the redox potential measuring device 61 and compares it with the concentration set by the concentration setting device 71b. , Calculate the deviation of the detected concentration from the set concentration. Then, the arithmetic controller 70 'calculates the amount of hydrogen peroxide necessary to eliminate the deviation, and continuously controls the chemical liquid pump 34 so that the calculated amount becomes the supply amount. Further, the arithmetic controller 70 'calculates the supply amounts of the auxiliaries E and G in correspondence with the composition ratio set by the chemical liquid ratio setting device 72b based on the calculated hydrogen peroxide supply amount, and each of them is calculated. The chemical liquid pumps 35 and 36 are continuously controlled so that the calculated amounts become the respective supplied amounts.

The chemical solution used in the chemical solution treating apparatus of the present invention is a chemical agent used for finishing plastic film, fiber yarn, cloth, etc. For example, in the case of fiber cloth, a desizing agent used for desizing treatment; Sodium, various bleaching agents, penetrating agents; or anti-wrinkling agents used in finishing processes; catalysts; softening agents; antistatic agents and the like. Such a drug solution may be a stock solution or an appropriately diluted solution.

As the detector of the chemical concentration in the treatment liquid, the redox potential,
The one that can electrically detect the concentration of the chemical solution, such as the ionization degree measurement, is used. The chemical solution that can detect the concentration includes acidic or alkaline substances such as sulfuric acid, hydrochloric acid, sodium hydroxide, and sodium carbonate that can detect the degree of ionization; electrolytes such as potassium chloride; or redox potentials such as hydrogen peroxide. Oxidizing agents and reducing agents capable of detecting the are suitable. A tracer substance for concentration detection is used to detect the concentration of nonionic substances such as penetrants whose concentration cannot be directly detected electrically. The amount of the tracer substance used is used in a certain ratio with the drug solution so that the concentration of the drug solution to be detected can be assayed.

(Effects of the Invention) As described above, the chemical treatment apparatus of the present invention can continuously control the concentration of the treatment liquid while continuously treating the object to be treated with the chemical. Moreover, a spare tank for adjusting the processing liquid is not required. Even if the chemical treatment conditions of the object to be treated in the treatment tank are changed, the treatment liquid can be quickly and stably adjusted to a predetermined concentration. Each chemical solution tank and processing tank are connected via a circulation path, and the chemical solution from each chemical solution tank is mixed with the processing solution in the circulation path once and then introduced into the post-treatment tank, so that the compatibility is excellent. Concentration can be adjusted stably even if there is no chemical solution. Since each chemical solution is sufficiently mixed with the processing solution, the object to be processed can be continuously and uniformly processed. Therefore, there is no change in the quality of the obtained chemical liquid processed product.

[Brief description of drawings]

FIG. 1 is a schematic diagram of the chemical liquid processing apparatus of the present invention, and FIG. 2 is
It is a schematic diagram of the chemical | medical solution processing apparatus in the other Example of this invention. 11 …… Treatment tank, 12 …… Circulating path, 21-29 …… Chemical solution tank,
31-39 …… Chemical solution pump, 41, 42, 44-47 …… Mixer,
60 …… Concentration detector, 61 …… Redox potential measuring instrument, 70, 7
0 '... Arithmetic controller, 71, 71a, 71b ... Concentration setter, 7
2, 72a, 72b ... Chemical liquid ratio setting device.

Claims (3)

[Claims] 1. A device for treating chemicals by continuously immersing an object to be treated in a treatment tank containing a treatment liquid containing a plurality of chemicals, wherein each chemical is supplied to the treatment tank through a circulation path. Chemical supply pump, concentration detector for a prescribed chemical in the treatment liquid, concentration setter for setting the concentration of the chemical in the treatment liquid, and chemical ratio setter for setting the composition ratio of each chemical in the treatment liquid And calculating the supply amount of the chemical liquid necessary to eliminate the deviation between the concentration of the chemical liquid by the concentration detector and the concentration set by the concentration setting device, and based on the supply amount, setting of the chemical liquid ratio setting device. A chemical liquid treatment apparatus comprising: a calculation controller that calculates the supply amount of another chemical liquid corresponding to the composition ratio and controls each of the chemical liquid supply pumps to reach the calculated supply amount. 2. The chemical liquid treatment apparatus according to claim 1, wherein the concentration detector can detect the concentration of the chemical liquid with a tracer substance for concentration test mixed in a predetermined chemical liquid. 3. The chemical liquid treatment apparatus according to claim 1, wherein a mixer for mixing the treatment liquid and the chemical liquid in the circulation passage is provided in the circulation passage.