A kind of preparation method of dry reverse osmosis composite membrane

A reverse osmosis composite membrane, dry technology, applied in the direction of reverse osmosis, semi-permeable membrane separation, chemical instruments and methods, etc., can solve the problem of separation performance attenuation of dry reverse osmosis composite membrane, and achieve the effect of solving the separation performance attenuation

Active Publication Date: 2017-12-12
HANGZHOU FANGRAN MEMBRANE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation of this method can not only realize the dry storage of the reverse osmosis composite membrane, but also effectively solve the problem of attenuation of the separation performance of the dry reverse osmosis composite membrane during long-term storage.

Method used

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  • A kind of preparation method of dry reverse osmosis composite membrane
  • A kind of preparation method of dry reverse osmosis composite membrane
  • A kind of preparation method of dry reverse osmosis composite membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] First, scrape-coat the N,N-dimethylacetamide solution containing 16.0wt% polysulfone on the surface of the non-woven fabric, and immerse it in water to remove the solvent to obtain the polysulfone support layer; then immerse the polysulfone support layer into the m-phenylenediamine solution (containing 0.1wt% sodium dodecylsulfonate surfactant), remove excess solution on the surface with a rubber roller; then the polysulfone support layer is contacted with an organic solution of trimesoyl chloride for 50 seconds, and at 80 Heat treatment in an oven at ℃~100℃ for 10 minutes; finally, soak the nascent reverse osmosis composite membrane in an aqueous solution containing 10wt% glycerin and 1wt% sodium bisulfite at a temperature of 40℃ for 2 minutes, and heat it in an oven at 80℃~100℃ heat treatment in an oven for 10 minutes to obtain a dry fully aromatic polyamide composite reverse osmosis membrane.

Embodiment 2

[0021] First, scrape-coat the N,N-dimethylacetamide solution containing 16.0wt% polysulfone on the surface of the non-woven fabric, and immerse it in water to remove the solvent to obtain the polysulfone support layer; then immerse the polysulfone support layer into the m-phenylenediamine solution (containing 0.1wt% sodium dodecylsulfonate surfactant), remove excess solution on the surface with a rubber roller; then the polysulfone support layer is contacted with an organic solution of trimesoyl chloride for 50 seconds, and at 80 Heat treatment in an oven at ℃~100℃ for 10 minutes; finally soak the nascent reverse osmosis composite membrane in an aqueous solution containing 10wt% glycerin and 1wt% formic acid at a temperature of 40℃ for 2 minutes, and heat treat in an oven at 80℃~100℃ In 10 minutes, a dry fully aromatic polyamide composite reverse osmosis membrane was obtained.

Embodiment 3

[0023] First, the N,N-dimethylacetamide solution containing 16.0wt% polysulfone is scraped on the surface of the non-woven fabric, and immersed in water to remove the solvent to obtain a polysulfone support layer; then the polysulfone support layer is immersed in m-phenylenediamine solution (containing 0.1wt% sodium dodecylsulfonate surfactant), remove excess solution on the surface with a rubber roller; then the polysulfone support layer is contacted with an organic solution of trimesoyl chloride for 50 seconds, and at 80 Heat treatment in an oven at ℃~100℃ for 10 minutes; finally, soak the nascent reverse osmosis composite membrane in an aqueous solution containing 10wt% glycerin and 1wt% butylhydroxyanisole at a temperature of 40℃ for 2 minutes, and heat it at 80℃~100℃ Heat treatment in an oven for 10 minutes to obtain a dry fully aromatic polyamide composite reverse osmosis membrane.

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Abstract

The invention relates to a preparation method of a dry reverse osmosis composite membrane. The preparation method comprises the following steps: soaking the conventional reverse osmosis composite membrane in an aqueous solution containing a protective agent, the soaking temperature is 10-50°C, and the soaking time is 1-10 minutes, and then placed in an oven at 80°C-100°C Heat treatment for 8 to 12 minutes, the protective agent is sodium bisulfite, potassium bisulfite, ammonium bisulfite, formic acid, oxalic acid, citric acid, potassium glycyrrhizinate, butyl hydroxyanisole, dibutyl hydroxy One or more mixtures of toluene, propyl gallate, tert-butyl hydroquinone, tea polyphenols, 3,4,5,7-tetrahydroxyflavone, licorice isoflavone solution. The preparation method can not only realize the dry storage of the reverse osmosis composite membrane, but also effectively solve the problem of attenuation of the separation performance of the dry reverse osmosis composite membrane during long-term storage.

Description

technical field [0001] The invention relates to a preparation method of a reverse osmosis composite membrane, in particular to a preparation method of a dry reverse osmosis composite membrane. Background technique [0002] Reverse osmosis membrane filtration technology is a high-efficiency, low-energy and easy-to-operate new separation technology, which can realize seawater desalination, reclaimed water reuse, waste water recycling, etc. It has been widely used in seawater and brackish water desalination, pure water preparation, Wastewater treatment, food processing, pharmaceuticals and biotechnology and other fields, and have achieved good economic, social and environmental benefits. [0003] Reverse osmosis membrane is the core and foundation of reverse osmosis technology. The development of reverse osmosis membrane has gone through three stages: in the 1950s, Reid used cellulose acetate as the membrane material to prepare a homogeneous reverse osmosis membrane; in 1960, L...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/12B01D71/56B01D67/00B01D61/02
Inventor 赵经纬王炎锋吕振华谢柏明
Owner HANGZHOU FANGRAN MEMBRANE TECH
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