Preparation method for dried reverse osmosis composite membrane

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

Active Publication Date: 2015-12-16
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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  • Preparation method for dried reverse osmosis composite membrane
  • Preparation method for dried reverse osmosis composite membrane
  • Preparation method for dried 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, 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% butyl hydroxyanisole 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 for a dried reverse osmosis composite membrane. The preparation method comprises the following steps: soaking a conventional reverse osmosis composite membrane in a protector-containing aqueous solution, wherein the soaking temperature is 10-50 DEG C and the soaking time is 1-10 minutes; and then carrying out thermal treatment for 8-12 minutes in an oven at 80-100 DEG C, wherein the protector is one or a mixture of more of sodium hydrogen sulfite, potassium hydrogen sulfite, ammonium hydrogen sulfite, formic acid, oxalic acid, citric acid, dipotassium glycyrrhizate, butylated hydroxyanisole, butylated hydroxytoluene, propylgallate, tert-butylhydroquinone, tea polyphenol, 3,4,5,7-tetrahydroxy flavone and a glycyrrhisoflavone solution. The preparation method provided by the invention not only can be used for realizing dry state storage of the reverse osmosis composite membrane, but also can effectively solve the problem that the dried reverse osmosis composite membrane is attenuated in performance in a long-term storage process.

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 Applications(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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