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Washing apparatus, and process for producing porous membrane

A technology of porous membrane and manufacturing method, applied in chemical instruments and methods, membrane, membrane technology, etc., can solve the problems of not being able to obtain sufficient cleaning efficiency, limited cleaning solution speed, etc.

Active Publication Date: 2013-09-18
MITSUBISHI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] However, when the solvent is removed from the porous membrane by the cleaning method described in Patent Document 1, it is necessary to increase the number of cleaning tanks in order to improve the cleaning efficiency, resulting in an increase in the size of the facility.
[0017] In addition, since the cleaning tank is inclined by 1-3 degrees, the speed of the cleaning liquid flowing in the cleaning tank is limited
Therefore, sufficient cleaning efficiency may not be obtained

Method used

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  • Washing apparatus, and process for producing porous membrane
  • Washing apparatus, and process for producing porous membrane
  • Washing apparatus, and process for producing porous membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0391] Hereinafter, although an Example demonstrates this invention more concretely, this invention is not limited to these Examples.

[0392] [Test example]

[0393] Hereinafter, test examples will be described.

Embodiment 1

[0427] A porous membrane was formed in the same manner as in Test Example 1.

[0428] Next, warm water heated to 70° C. by a heat exchanger was dropped from a height of 1 m at a flow rate of 2.0 L / min, and the porous membrane with the sinker was put into contact with the water flow to perform cleaning treatment.

[0429] The porous membrane after performing the cleaning treatment for 30 seconds, 60 seconds, or 120 seconds was cut in half and divided into an upstream part and a downstream part. Solvent concentration (C 0 ) and the residual solvent concentration in the porous membrane after cleaning (C 2 ) ~ (C 4 ). The result is as Figure 8 shown.

[0430] For the following Examples 2-4 and Comparative Example 1 figure 1 The device shown is cleaned.

[0431] The temperature of the cleaning solution in Examples 2 to 4 was adjusted to 80° C. with a heat exchanger, and circulated by a pump. In addition, by supplying or increasing pure water at 2 L / min, a part of the clea...

Embodiment 2

[0437] The porous membrane after the coagulation step was formed in the same manner as in Test Example 1.

[0438] Next, the obtained porous membrane was run at a speed of 10 m / min to perform cleaning treatment. The porous membrane after the treatment is cut into a length of 50 cm, and the mass (W 1 ), quality (W 2 ), quality (W 3 ) and residual solvent concentration (C 0 ). In addition, the residual solvent concentration (C 0 ) is the residual solvent concentration in the porous membrane before the cleaning treatment (residence time in the cleaning solution: 0 seconds).

[0439] Next, the washed porous membrane with a measured mass was immersed in 50 mL of pure water (normal temperature) for half a day to diffuse and extract DMAc remaining in the porous membrane into the pure water (extraction treatment). Collect the pure water after the extraction process, according to the measured value and the dilution ratio (according to the quality of the pure water used in the ext...

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Abstract

The present invention relates to a process for producing a porous membrane. The method comprises a coagulation step of coagulating a membrane-forming raw material solution to form a porous membrane, a washing step of washing the porous membrane to remove any substance remaining in the porous membrane, and a removal step of removing any hydrophilic polymer remaining in the porous membrane, wherein the washing step comprises allowing the porous membrane to run in such a manner that the porous membrane can contact with the falling washing solution. The present invention also relates to a washing apparatus which washes a porous membrane produced by coagulating a membrane-forming raw material solution, and which comprises a falling means for causing a washing solution to fall and a running means for allowing the porous membrane to run in such a manner that the porous membrane can contact with the falling washing solution. The present invention can provide: a process for producing a porous membrane, in which a solvent can be removed from the porous membrane with high efficiency within a short time and at low cost without requiring the use of any large facility; and a washing apparatus which can be used suitably for the process.

Description

technical field [0001] The present invention relates to a cleaning device for cleaning a porous membrane, and a method for manufacturing the porous membrane. This application is based on the patent application No. 2010-243853 filed in Japan on October 29, 2010, the patent application No. 2011-076244 filed in Japan on March 30, 2011, and the patent application filed in Japan on July 12, 2011 Priority is claimed to Patent Application No. 2011-153646, Patent Application No. 2011-170999 filed in Japan on August 4, 2011, and Patent Application No. 2011-176720 filed in Japan on August 12, 2011, the contents of which are incorporated herein by reference. Background technique [0002] In recent years, due to increased concerns about environmental pollution and stricter regulations, methods using filtration membranes excellent in separation completeness and compactness have attracted attention as water treatment methods. [0003] As a method for producing a porous membrane used as a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00
CPCB01D67/0088B01D69/08B01D2323/42B01D67/0009B01D67/003B01D67/0083B01D67/0095B01D69/06B01D2323/26B01D67/0016B01D67/00B01D67/0081
Inventor 平冈康太郎隅敏则藤木浩之
Owner MITSUBISHI CHEM CORP
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