Surface modifying method for promoting water separating selective of osmotic vaporization membrane

A technology of pervaporation membrane and surface modification, applied in semi-permeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve the problem of easy grafting reaction, and achieve the effect of low price, wide source and cost reduction.

Inactive Publication Date: 2007-10-17
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Moreover, the molecular chains of these membranes have active groups s

Method used

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  • Surface modifying method for promoting water separating selective of osmotic vaporization membrane
  • Surface modifying method for promoting water separating selective of osmotic vaporization membrane
  • Surface modifying method for promoting water separating selective of osmotic vaporization membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1. Preparation of glutaraldehyde-crosslinked chitosan film: Chitosan was purchased from Xianju Chemical Products Co., Ltd. (China, Zhejiang), with a deacetylation degree of 88% and a viscosity-average molecular weight of 550,000. The cross-linking agent glutaraldehyde (25% aqueous solution) was purchased from China Wulian Chemical Factory, and maleic anhydride, glacial acetic acid, absolute ethanol, isopropanol, etc. were purchased from Hangzhou Huipu and Wuxi Zhanwang Chemical Products Company. A certain quality of chitosan was dissolved in 2% glacial acetic acid aqueous solution to obtain a solution with a concentration of 2%. Add 1% GA (relative to the mass of chitosan) into the filtered chitosan solution and stir evenly. The chitosan solution containing 1% glutaraldehyde was cast on a level-adjusted glass plate, and dried at 40°C for two days to obtain a chitosan film with a dense structure and 1% glutaraldehyde cross-linked. The membrane was heat-treated a...

Embodiment 2

[0029] Embodiment 2: According to the modification treatment steps in Embodiment 1, changing the conditions of the modification treatment can obtain different modification results, and the corresponding results are shown in the chart in the following beneficial effects.

Embodiment 3

[0030] Example 3. According to the experimental procedure in Example 1, the content of glutaraldehyde was changed when preparing the glutaraldehyde cross-linked chitosan film, and a series of cross-linked chitosan films with different cross-linking degrees were prepared. Then, according to the modification treatment steps in Example 1, and the surface modification time was determined as 60 minutes, the surface carboxylation modification was carried out on these crosslinked chitosan films.

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PUM

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Abstract

The invention discloses a surface modified method for increasing water separation selectivity of high-pervasive vaporization membrane, especially to a surface modified method of chitosan macromolecule membrane and polyvinyl alcohol macromolecule membrane. The acetone solution of maleic anhydride is used as modification liquor. The chemical reaction occurs on the surface of chitosan membrane and polyvinyl alcohol membrane for some time to make the surface of the membrane to be modified, washing and drying the modified membrane to complete the whole modified process. The advantage of the invention is that the selective permeability of chitosan membrane and polyvinyl alcohol membrane is improved, and at the same time, the flux holds the line or is more raised to reduce the energy consumption effectively. The invention can be broadly used in the separation for various of liquid mixture.

Description

technical field [0001] The invention relates to a surface modification method for improving the water separation selectivity of a pervaporation membrane, in particular to a method for modifying the surface of chitosan polymer membranes and polyvinyl alcohol polymer membranes with maleic anhydride . technical background [0002] According to the dissolution-diffusion model, the surface structure and properties of the separation membrane are an important factor affecting the separation performance of the membrane. A large number of studies have shown that the separation membrane with hydrophobic groups on the surface is beneficial to improve its separation selectivity for organic matter, while the hydrophilic group on the surface is conducive to enhancing the selective adsorption of water. For organic / water mixed separation systems It is beneficial to improve the separation selectivity of water. Therefore, adjusting and optimizing the surface properties of the separation mem...

Claims

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Application Information

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IPC IPC(8): B01D71/82B01D67/00B01D69/02
Inventor 王新平张伟
Owner ZHEJIANG SCI-TECH UNIV
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