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A kind of preparation method of cellulose acetate butyrate forward osmosis membrane

A technology of acetic acid butyric acid and forward osmosis membrane, applied in the direction of semipermeable membrane separation, chemical instruments and methods, membrane technology, etc., to achieve high water flux, high rejection rate and simple process

Inactive Publication Date: 2016-01-27
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to literature reports, currently commercialized forward osmosis membranes mainly include cellulose triacetate forward osmosis membranes produced by Hydration Technologies in the United States, but their application is limited due to the ease of degradation of this membrane material.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Step 1: Weigh 36.5g of dimethylacetamide, 7.5g of formamide, and 6g of cellulose acetate butyrate. After mixing, heat and stir to dissolve. The heating temperature is controlled at 55°C~75°C; bubble to obtain the casting solution;

[0020] Step 2: Scrape the above-mentioned film-casting liquid by a film scraping machine at room temperature to form a liquid film, the thickness of which is 75 μm;

[0021] Step 3: Keep the above liquid membrane at room temperature for 2s~3s, and then put it into the pre-prepared water with a temperature of 14°C to obtain a cellulose acetate butyrate forward osmosis membrane with a thickness of 50μm.

[0022] Using 4mol / L glucose as the drawing solution and 0.1mol / L sodium chloride aqueous solution as the raw material solution, after testing, the cellulose acetate butyrate forward osmosis membrane obtained in this example has a high resistance to 0.1mol / L sodium chloride aqueous solution. The rejection rate is 97.6%, and the water flux is ...

Embodiment 2

[0024] Step 1: Weigh 40g of dimethylformamide, 5g of formamide, and 5g of cellulose acetate butyrate, heat and stir to dissolve after mixing, and control the heating temperature at 55°C~75°C; Obtain casting solution;

[0025] Step 2: Scrape the above-mentioned film-casting solution by a film scraper at room temperature to form a liquid film, the thickness of which is 90 μm;

[0026] Step 3: Keep the above liquid membrane at room temperature for 2s~3s, and then put it into the pre-prepared aqueous solution containing dimethylformamide at a temperature of 5°C to obtain a cellulose acetate butyrate forward osmosis membrane with a thickness of 60 μm .

[0027] Using 4mol / L glucose as the drawing solution and 0.1mol / L sodium chloride aqueous solution as the raw material solution, after testing, the cellulose acetate butyrate forward osmosis membrane obtained in this example has a high resistance to 0.1mol / L sodium chloride aqueous solution. The rejection rate is 97.2%, and the wa...

Embodiment 3

[0029] Step 1: Weigh 34g of 1,4-dioxane, 10g of formamide, and 6g of cellulose acetate butyrate, heat and stir to dissolve after mixing, and control the heating temperature at 25°C~35°C; bubble to obtain the casting solution;

[0030] Step 2: Scrape the above-mentioned film-casting solution by a film scraper at room temperature to form a liquid film, the thickness of which is 85 μm;

[0031] Step 3: Keep the above liquid film at room temperature for 2s~3s, and then put it into a pre-prepared aqueous solution containing 1,4-dioxane at 20°C to obtain cellulose acetate butyrate with a thickness of 50μm Forward osmosis membrane.

[0032] Using 4mol / L glucose as the drawing solution and 0.1mol / L sodium chloride aqueous solution as the raw material solution, after testing, the cellulose acetate butyrate forward osmosis membrane obtained in this example has a high resistance to 0.1mol / L sodium chloride aqueous solution. The rejection rate is 99.7%, and the water flux is 8.74L / (m 2...

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Abstract

The invention discloses a method for preparing a cellulose acetate butyrate forward osmosis membrane. The method for preparing the cellulose acetate butyrate forward osmosis membrane comprises steps that 1) cellulose acetate butyrate and methanamide are added into a solvent, heated and stirred; after complete dissolution, the cellulose acetate butyrate and the methanamide stand under the room temperature for defoaming, so that a membrane casting solution is obtained; and in the membrane casting solution, the cellulose acetate butyrate takes up 10% to 30% by weight and the methanamide takes up 5% to 30% by weight; 2) the membrane casting solution is enabled to pass through a membrane scraping machine under the room temperature so as to be formed into a liquid membrane in a scraping way; and 3) the liquid membrane stays for a period of time under the room temperature and then is put into a gel media, so that the cellulose acetate butyrate forward osmosis membrane is obtained. The preparation method provided by the invention is simple in technology and low in cost; the cellulose acetate butyrate forward osmosis membrane prepared through the adoption of the preparation method has good chemical stability and extremely high retention rate and water flux; and therefore, a novel forward osmosis membrane material is provided for the fields of sea water desalination, water purification, waste water treatment, food, medicine, energy and the like.

Description

technical field [0001] The invention belongs to the technical field of polymer membrane separation, and in particular relates to a preparation method of a cellulose acetate butyrate forward osmosis membrane. Background technique [0002] With the rapid development of society and the rapid increase of population, the shortage of fresh water resources has attracted the attention of all countries in the world. my country is a country with abundant water resources, and it is also one of the most water-scarce countries. Obtaining fresh water resources from seawater is an important method to solve the shortage of fresh water resources. Traditional seawater desalination mainly uses reverse osmosis membrane technology, which is a membrane separation technology that uses pressure difference as the driving force to separate the solvent from the solution. It applies pressure to the feed liquid on one side of the reverse osmosis membrane. When the pressure exceeds its osmotic pressure ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/18B01D67/00
Inventor 屠振英肖通虎刘成
Owner NINGBO UNIV