Solvent modifying method for polyamide composite film

A technology of polyamide and composite membrane, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., to achieve the effect of simple process, easy and safe operation, and high separation performance

Inactive Publication Date: 2005-01-26
HANGZHOU WATER TREATMENT TECH RES & DEV CENT NAT BUREAU OF OCEANGRAPHY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Prior to this, the polyamide reverse osmosis membrane was treated with a solvent to form a pervaporation membrane, which has not been recorded in the literature, so the inventor has made further explorations on it

Method used

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  • Solvent modifying method for polyamide composite film
  • Solvent modifying method for polyamide composite film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Embodiment 1: Get commercial polyamide reverse osmosis composite membrane and immerse in the modifier aqueous solution that acetic acid concentration is 8wt%, temperature 25 ℃, treatment time 1h, the obtained modified polyamide composite membrane pervaporation separates isopropanol water mixture Performance: separation factor 276, water flux 307g / m 2 h.

Embodiment 2

[0036] Embodiment 2: Only change modifier acetic acid concentration 4wt%, all the other conditions are the same as embodiment 1, the performance of the pervaporation separation of isopropanol-water mixture of gained modified polyamide composite membrane: separation factor 210, water flux 332g / m 2 h.

Embodiment 3

[0037] Embodiment 3: only change modifier acetic acid concentration 16wt%, all the other conditions are the same as embodiment 1, the performance of the pervaporation separation of isopropanol-water mixture of gained modified polyamide composite membrane: separation factor 184, water flux 398g / m 2 h.

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Abstract

The invention is a solvent modification method for film. The polyamide compound film is immersed in the polyamide solvent, bleached in deioned water, dried in room temperature, and the modified polyamide penetration vaporous compound film can be acquired. The pressure of the modified film to water compound containing 87wt% of isopropyl alcohol under 25deg.C is less than 1000 Pa, the water flux is 174g/m2h-405g/m2h, the separation factor is 174-276, the percent swell rate to water and isopropyl alcohol are 31.7-40.89 and 10.24-15.73, after modified, the water flux is decreased about 51%, the upgrading rate of separation factor reaches to 144%, the percent swell rate to water is upgraded about 10%-42%, the percent swell rate to is decreased to 4%-39%. The invention is simple.

Description

technical field [0001] The invention belongs to the solvent modification treatment of a polyamide composite membrane, in particular to a method in which a polyamide reverse osmosis composite membrane used for water treatment and desalination becomes a pervaporation membrane for separating organic aqueous solution through solvent treatment. Background technique [0002] Polyamide is an excellent material for separation membranes. Polyamide has been made into a reverse osmosis membrane for water treatment and desalination through the composite membrane process. The polyamide reverse osmosis composite membrane manufacturing technology is mature, and many factories have been built around the world. The product output is increasing year by year, and the application market is broad. However, polyamide pervaporation membranes are not seen in the market because of their complicated production technology. [0003] Chinese invention patents (Applicatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/56
Inventor 蔡邦肖
Owner HANGZHOU WATER TREATMENT TECH RES & DEV CENT NAT BUREAU OF OCEANGRAPHY
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