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Cyclodextrin modified composite organic solvent nanofiltration membrane and preparation method thereof

A compound organic solvent and cyclodextrin technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of poor selectivity, unsuitable alkane solvent, non-polar solvent without flux, etc., to achieve The effect of good thermal stability

Inactive Publication Date: 2014-11-05
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Silicone rubber membrane has the advantage of large flux in non-polar solvents, but its excessive swelling makes its selectivity poor, while the flux to polar solvents is small; polyimide membranes can withstand polar and aprotic solvents, But there is basically no flux for non-polar solvents, not suitable for alkane solvents
At present, there is no research report on the use of cyclodextrin to strengthen the separation characteristics of organic solvent nanofiltration membranes

Method used

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  • Cyclodextrin modified composite organic solvent nanofiltration membrane and preparation method thereof
  • Cyclodextrin modified composite organic solvent nanofiltration membrane and preparation method thereof
  • Cyclodextrin modified composite organic solvent nanofiltration membrane and preparation method thereof

Examples

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Effect test

Embodiment 1

[0026] The polyacrylonitrile ultrafiltration membrane with a molecular weight cut off of 10,000 was submerged to 2.0 mol. L -1 Sodium hydroxide aqueous solution, submerged at 50° C. for 1 hour, then taken out and fully washed with deionized water at room temperature to obtain a hydrolyzed polyacrylonitrile ultrafiltration membrane.

[0027] Add α-cyclodextrin to deionized water, and ultrasonically treat it at room temperature for 1 h; then add piperazine to the above-mentioned cyclodextrin aqueous solution, and continue ultrasonic stirring for 1 h to obtain an aqueous phase solution, wherein the amount of piperazine added is 2% of the weight of the solution. 3%, and the amount of α-cyclodextrin added is 0.03% of the solution weight. Cast the obtained aqueous phase solution on a hydrolyzed polyacrylonitrile ultrafiltration membrane, soak at room temperature for 20 minutes, remove excess solution on the surface of the membrane, and dry at room temperature to remove water from t...

Embodiment 2

[0030] Immerse the polyacrylonitrile ultrafiltration membrane with a molecular weight cut off of 100,000 to 1.0 mol. L -1 Sodium hydroxide aqueous solution, submerged at 50° C. for 1 hour, then taken out and fully washed with deionized water at room temperature to obtain a hydrolyzed polyacrylonitrile ultrafiltration membrane.

[0031] Add β-cyclodextrin to deionized water, and ultrasonically treat it at room temperature for 2 h; then add polyethyleneimine to the above cyclodextrin aqueous solution, and continue ultrasonic stirring for 1 hour to obtain an aqueous phase solution, in which water: polyethyleneimine :β-cyclodextrin=25:1:0.03 (mass ratio). Cast the obtained casting solution on a hydrolyzed polyacrylonitrile ultrafiltration membrane, soak at room temperature for 10 minutes, remove excess solution on the surface of the membrane, and dry at room temperature to remove water from the membrane surface; then use 4% by mass of trimesoyl chloride The n-hexane solution obt...

Embodiment 3

[0034]A polyacrylonitrile ultrafiltration membrane with a molecular weight cut-off of 200,000 was selected, and the membrane was prepared according to the method and steps described in Example 2, but the cyclodextrin dissolved in the aqueous solution was γ-cyclodextrin, and its consumption was the same as in Example 2. The film produced is denoted as γ-cyclodextrin film.

[0035] The area swelling degree of γ-cyclodextrin film in isopropanol, ethyl acetate, butanone, n-heptane and toluene is less than 4.5%. Thermogravimetric analysis (TGA) shows that the initial degradation temperature of the film is 328.1°C, that is, the film has Good thermal stability. At room temperature and 1 MPa, the rejection rate of γ-cyclodextrin membrane to PEG4000 was higher than 90%; the fluxes of γ-cyclodextrin membrane to isopropanol, ethyl acetate, butanone and n-heptane were 44.6, 27.6, 24.1 and 48.1 L. m -2 ﹒ h -1 , the flux of toluene reaches 25.6 L. m -2 ﹒ h -1 .

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Abstract

The invention discloses a cyclodextrin modified composite organic solvent nanofiltration membrane and a preparation method thereof, and belongs to the technical field of membranes. The key technology is as follows: a polyacrylonitrile ultrafiltration membrane modified by hydrolysis is used as a base membrane, an aqueous solution is prepared from amines and cyclodextrin, and is casted on the base membrane, an organic phase solution containing acyl chloride compounds is used for casting, and a composite (separation) layer is prepared by interfacial polymerization reaction; finally, the cyclodextrin modified composite organic solvent nanofiltration membrane is obtained by vacuum drying. The nanofiltration membrane has good solvent resistance and good thermal stability in alcohols, esters, ketones, alkanes and benzene organic solvents, and has certain permselectivity in the alcohols, esters, ketones, alkanes and benzene organic solvents; by changing of the preparation conditions, the penetration flux and retention performance of the membrane can be controlled in order to adapt to the requirements of practical applications. The membrane is especially suitable for nanofiltration of alcohols and alkanes organic solvents.

Description

technical field [0001] The invention belongs to the field of membrane technology, in particular to a cyclodextrin modified composite organic solvent nanofiltration membrane and a preparation method thereof. Background technique [0002] Organic solvent nanofiltration (SRNF) is a promising clean and efficient separation technology, which is widely used in the separation of organic solvent systems. For example, in the preparation of peptide drugs in the pharmaceutical industry, the nanofiltration process can improve the entire downstream process of peptides and solve the problem of limiting peptides. Large-scale production problems in industrial development; in the process of mineral oil separation, for the separation of free fatty acid vegetable oil and the removal of heavy components in coal refining, the application of organic solvent nanofiltration technology can reduce energy consumption and simplify the solvent treatment process. Organic solvent nanofiltration membrane i...

Claims

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Application Information

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IPC IPC(8): B01D71/42B01D69/12B01D67/00
Inventor 张浩勤王景涛毛恒杨光辉李凌波刘金盾
Owner ZHENGZHOU UNIV
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