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Cellulose acetate forward osmosis film material and preparation method thereof

A technology of cellulose acetate and cellulose triacetate, which is applied in the direction of semipermeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve the problems of uneven bonding of the interfacial polymerization cortex, low retention rate, and easy peeling of the cortex, etc. Achieve the effect of good pore structure connectivity, high retention rate and good hydrophilicity

Inactive Publication Date: 2014-05-14
SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the hydrophilic material is used as the support, the interfacial polymerized skin layer is uneven and poorly combined with the support, and the skin layer is easy to fall off.
[0011] Researchers at the National University of Singapore also tried to obtain a polyelectrolyte skin layer by layer-layer self-assembly, but this membrane can intercept divalent cations, and the rejection rate for monovalent salt ions is much lower than that of commercial HTI membranes.

Method used

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  • Cellulose acetate forward osmosis film material and preparation method thereof
  • Cellulose acetate forward osmosis film material and preparation method thereof

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Embodiment 1

[0054] The preparation method of cellulose acetate forward osmosis membrane material in the present embodiment is as follows:

[0055] 1) Preparation of casting solution: Add 19g of a mixture of cellulose triacetate and cellulose diacetate with a mass ratio of 2:1 into 45g of N-methylpyrrolidone, 30g of methyl acetate and 6g of acetone at a temperature of 40°C Stir and dissolve to form a uniform casting solution;

[0056] 2) Degassing the casting solution: the degassing temperature is 25°C;

[0057] 3) Scrape the film with a film scraping machine: apply the defoamed casting solution in step 2) on a dry and clean glass plate, scrape the film with a film scraping machine to form a nascent eco-film, and place the nascent eco-film on The temperature is 25°C and the relative humidity is 65% in the air for 3 seconds;

[0058] 4) Gel bath treatment: Put the nascent membrane formed in step 3) into the gel bath to separate and solidify to form a membrane material; wherein, the medium...

Embodiment 2

[0065] The preparation method of cellulose acetate forward osmosis membrane material in the present embodiment is as follows:

[0066] 1) Preparation of casting solution: add 19g of cellulose triacetate to 45g of N-methylpyrrolidone, 30g of methyl acetate and 6g of acetone, stir and dissolve at a temperature of 25°C to form a uniform casting solution;

[0067] 2) Degassing the casting solution: the degassing temperature is 25°C;

[0068] 3) Scrape the film with a film scraping machine: apply the defoamed casting solution in step 2) on a dry and clean glass plate, scrape the film with a film scraping machine to form a nascent eco-film, and place the nascent eco-film on Volatilize for 3 seconds in air with a temperature of 25°C and a relative humidity of 59%;

[0069] 4) Gel bath treatment: Put the nascent membrane formed in step 3) into a gel bath to separate and solidify to form a membrane material; wherein, the medium of the gel bath is selected from water; the temperature o...

Embodiment 3

[0075] The preparation method of cellulose acetate forward osmosis membrane material in the present embodiment is as follows:

[0076] 1) Preparation of casting solution: Add 17g of cellulose triacetate to 50g of N-methylpyrrolidone, 23g of tetrahydrofuran and 10g of acetone, stir and dissolve at a temperature of 30°C to form a uniform casting solution;

[0077] 2) Degassing the casting solution: the degassing temperature is 30°C;

[0078] 3) Scrape the film with a film scraping machine: apply the defoamed casting solution in step 2) on a dry and clean glass plate, scrape the film with a film scraping machine to form a nascent eco-film, and place the nascent eco-film on Volatilize for 5 seconds in air at a temperature of 25°C and a relative humidity of 57%;

[0079] 4) Gel bath treatment: Put the nascent membrane formed in step 3) into the gel bath to separate and solidify to form a membrane material; wherein, the medium of the gel bath is selected from water; the temperature...

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Abstract

The invention discloses a cellulose acetate forward osmosis film material. The cellulose acetate forward osmosis film material is a dissymmetric film, and is 20-150 micrometers in thickness and 55 to 90 percent in porosity. The cellulose acetate forward osmosis film material is made of cellulose acetate casting film liquid in a film scraping manner by adopting a film scraping machine; the content of cellulose acetate in the cellulose acetate casting film liquid is 5-40wt%, and the balance refers to macromolecule solvents. The cellulose acetate forward osmosis film material disclosed by the invention is suitable for being used in the forward osmosis process, is good in hydrophilcity and has a superthin structure; the porosity of a supporting layer is large; the connectivity of a hole structure is good; the internal concentration polarization can be effectively reduced; the compactness of a surface layer is good; the reject rate of univalency salt is high; small molecules such as trace suspended solids, bacteria and viruses in a water body can be effectively removed; the treatment efficiency is high and the operation cost is low.

Description

technical field [0001] The invention relates to the field of polymer membrane materials, in particular to a cellulose acetate forward osmosis membrane material and a preparation method thereof. Background technique [0002] Most of the earth's surface is covered by oceans, and only 0.8% of the water resources are drinkable fresh water. With the increasing environmental pollution, the world is facing serious water resources, environment and energy crises. The development and utilization of seawater, which accounts for more than 99% of the earth's surface, is an effective way to solve the water resource crisis. However, the reverse osmosis technology widely used in seawater desalination needs to apply a large external pressure and consumes a lot of energy. Forward osmosis technology is a new water treatment technology born to solve this key problem. Forward osmosis technology is to place solutions with different osmotic pressures on both sides of the semi-permeable membrane,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/16B01D69/02B01D67/00
Inventor 何涛李春霞殷勇李雪梅宋健峰王周为赵宝龙陈刚张蒙晰姜标
Owner SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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