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Preparation method of high-performance cellulose triacetate forward osmosis membrane

A technology of triacetate fiber and forward osmosis membrane, which is applied in the field of materials science, can solve the problem of low permeation flux, achieve large permeation flux, improve mechanical properties, and simplify the process flow

Inactive Publication Date: 2016-07-13
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, under certain conditions, the salt rejection rate of the blended membranes of cellulose acetate and cellulose triacetate prepared by Nguyen et al. is higher than 99.5%, but the permeation flux is lower than 10L / (m 2 h) (See ThiPhuongNgaNguyen, et al.Preparationofcellulosetriacetate / celluloseacetate(CTA / CA)-basedmembranesforforwardosmosis[J].J.Membr.Sci.2013,433:49-59)

Method used

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  • Preparation method of high-performance cellulose triacetate forward osmosis membrane
  • Preparation method of high-performance cellulose triacetate forward osmosis membrane
  • Preparation method of high-performance cellulose triacetate forward osmosis membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Add 1wt.% lactic acid to a binary mixed solvent of acetone and N-methylpyrrolidone, ultrasonicate for 10 minutes; make it fully mixed. Then add a total amount of 16wt.% triacetate fiber, control the temperature at 50°C, and mechanically stir for 24 hours to obtain the casting solution; after fully defoaming the obtained casting solution at 50°C, place a scraper knife with a certain gap in the Scratch the film on a glass plate; then, immerse the glass plate with a thin layer of casting solution in a gel bath at 25°C to form a phase-separated film, then soak it in deionized water for 7 days, take it out, and dry it naturally in the air to obtain triacetic acid Fiber forward osmosis membrane.

[0026] In the binary mixed solvent composed of acetone and N-methylpyrrolidone, acetone and N-methylpyrrolidone are based on the mass percentage of the casting solution, acetone is 18.0wt.%, and N-methylpyrrolidone is 65.0wt .%; The gel bath is pure water. The gap of the set docto...

Embodiment 2

[0029] Add 6.0wt.% lactic acid to the binary mixed solvent of acetone and N-methylpyrrolidone, and ultrasonicate for 10 minutes; make it fully mixed. Then add a total amount of 14.0wt.% triacetate fiber, control the temperature at 40°C, and mechanically stir for 24 hours to obtain the casting solution; after fully degassing the obtained casting solution at 40°C, set the scraping knife to a certain height, Scratch the film on a glass plate; then, immerse the glass plate with a thin layer of casting solution in a gel bath at 20°C to form a phase-separated film, then soak it in deionized water for 7 days, take it out, and dry it naturally in the air to obtain triacetic acid Fiber forward osmosis membrane.

[0030] In the binary mixed solvent composed of acetone and N-methylpyrrolidone, acetone and N-methylpyrrolidone are based on the mass percentage of the casting solution, acetone is 20.0wt.%, and N-methylpyrrolidone is 60.0wt .%; the gel bath is pure water; the gap of the set ...

Embodiment 3

[0033] Add 3.0wt.% lactic acid to the binary mixed solvent of acetone and N-methylpyrrolidone, and ultrasonicate for 10 minutes; make it fully mixed. Then add a total amount of 18.0wt.% triacetate fiber, control the temperature at 40°C, and mechanically stir for 24 hours to obtain the casting solution; after fully defoaming the obtained casting solution at 40°C, set the scraping knife to a certain height, Scratch the film on a glass plate; then, immerse the glass plate with a thin layer of casting solution in a gel bath at 25°C to form a phase-separated film, then soak it in deionized water for 7 days, take it out, and dry it naturally in the air to obtain triacetic acid Fiber forward osmosis membrane.

[0034]In the binary mixed solvent composed of acetone and N-methylpyrrolidone, acetone and N-methylpyrrolidone are based on the mass percentage of the casting solution, acetone is 15.0wt.%, and N-methylpyrrolidone is 64.0wt .%; the gel bath is pure water; the gap of the set d...

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Abstract

The invention relates to a preparation method of a high-performance cellulose triacetate forward osmosis membrane. The preparation method comprises the following steps: (1) preparing membrane casting fluid which is prepared from cellulose triacetate, N-methylpyrrolidinone, acetone and lactic acid: adding the lactic acid into a binary mixed solvent of the acetone and the N-methylpyrrolidinone, performing ultrasonic treatment for 1-10min to ensure that the lactic acid and the binary mixed solvent are sufficiently and uniformly mixed, then adding a membrane material, namely the cellulose triacetate, controlling the temperature to 30-60 DEG C, and performing mechanical stirring for dissolving so as to obtain the uniform membrane casting fluid; (2) performing sufficient deaeration on the membrane casting fluid at 30-60 DEG C, and performing membrane scraping on a glass plate; (3) immersing the glass plate with a thin layer of the membrane casting fluid in a gel coagulation bath of 10-50 DEG C, performing phase separation and membrane formation, then soaking the glass plate in deionized reclaimed water for 3-8d, after surplus solvents are removed, taking out the glass plate, and performing natural airing so as to obtain the cellulose triacetate forward osmosis membrane. Compared with the prior art, the preparation method disclosed by the invention has the advantages that the technological process is simple, requirements on equipment are low, preparation conditions are easy to control, and besides, mass production is easy to perform.

Description

[technical field] [0001] The invention belongs to the field of materials science, in particular to a preparation method of a high-performance triacetate fiber forward osmosis membrane. [Background technique] [0002] Forward osmosis membrane separation technology uses the osmotic pressure difference to make the solvent enter the high osmotic pressure end from the low osmotic pressure end through the selective semi-permeable membrane, which can realize the application of seawater desalination, sewage treatment, drug release, food concentration and other fields. Because it does not require external pressure in the operation process, it has the advantages of high rejection rate, high water quality, low membrane fouling, low energy consumption, and less concentrated water discharge, which has attracted more and more attention and attention at home and abroad. However, the research on forward osmosis membranes is still in its infancy. The only forward osmosis membrane commerciali...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/16B01D69/02B01D69/10B01D67/00B01D61/00
CPCB01D71/16B01D61/002B01D67/0011B01D69/02B01D69/10B01D2325/24B01D2325/36
Inventor 陈桂娥孙威广许振良吴琼徐孙杰朱维纬叶静沈倩郑晓鹏桂明哲严思佳刘昊炎王强强
Owner SHANGHAI INST OF TECH
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