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Method for preparing chitosan/ZSM-5 molecular compound film

A technology of ZSM-5 and chitosan, which is applied in the field of preparation of chitosan/molecular sieve composite membranes, can solve the problems of unreachable permeability and separation performance to be improved, and achieve good pervaporation separation performance and easy reaction modification , the effect of high mechanical strength

Active Publication Date: 2008-01-09
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these studies mainly use homogeneous membranes, the separation performance of the membranes needs to be improved, and the permeability performance required by industrial applications cannot be achieved.

Method used

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  • Method for preparing chitosan/ZSM-5 molecular compound film
  • Method for preparing chitosan/ZSM-5 molecular compound film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Accurately weigh 1.5g CS (molecular weight: 200,000, degree of deacetylation: 75%-85%) and dissolve it in 2% acetic acid aqueous solution at 25°C, stir evenly to prepare a 1.5wt% CS solution. Add 0.013g (5% of the mass of CS in the film) ZSM-5 molecular sieve into 17g of 1.5wt% CS solution that has been weighed, stir until the solution is evenly clarified, vacuumize and degas, and then cast the film The solution was poured on a clean glass plate, and after the solvent evaporated, the film was peeled off from the glass plate to obtain a CS / ZSM-5 composite film containing 5% ZSM-5 molecular sieve.

[0034] The membrane is pervaporated to separate methanol / DMC azeotrope (methanol 70wt%, DMC30wt%), the raw material side maintains normal pressure, the permeate side is vacuumed, the pressure on the downstream side is 2 h), separation coefficient 4.47, pervaporation separation index (PSI value) 1707.1g / (m 2 h).

Embodiment 2

[0036] Accurately weigh 1.5g CS (molecular weight: 500,000, degree of deacetylation: 75%-85%) and dissolve it in 2% acetic acid aqueous solution at 25°C, stir evenly to prepare a 1wt% CS solution. Add 0.025g (10% of the mass of CS in the film) ZSM-5 molecular sieve into the 25g 1wt% CS solution that has been weighed, stir until the solution is evenly clarified, vacuumize and degas, and then pour the casting solution Put it on a clean glass plate, and after the solvent volatilizes, peel off the film from the glass plate to obtain a CS / ZSM-5 composite film containing 10% ZSM-5 molecular sieve.

[0037] The membrane is pervaporated to separate methanol / DMC azeotrope (methanol 70wt%, DMC30wt%), the raw material side maintains normal pressure, the permeate side is vacuumed, the downstream pressure is 2h), separation coefficient 3.63, pervaporation separation index (PSI value) 1643.0g / (m 2 h).

Embodiment 3

[0039] Accurately weigh 1.5g CS (molecular weight: 200,000, degree of deacetylation: 75%-85%) and dissolve it in 2% acetic acid aqueous solution at 25°C, stir evenly to prepare a 1.5wt% CS solution. Add 0.039g (15% of the mass of CS in the film) ZSM-5 molecular sieve into 17g of 1.5wt% CS solution that has been weighed, stir until the solution is evenly clarified, vacuumize and defoam, and then cast the film The solution was poured on a clean glass plate, and after the solvent evaporated, the film was peeled off from the glass plate to obtain a CS / ZSM-5 composite film containing 15% ZSM-5 molecular sieve.

[0040] The membrane is pervaporated to separate methanol / DMC azeotrope (methanol 70wt%, DMC30wt%), the raw material side maintains normal pressure, the permeate side is vacuumed, the downstream pressure is 2 h), separation factor 2.81, pervaporation separation index (PSI value) 1250.5g / (m 2 h).

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Abstract

The present invention relates to process of preparing chitosan / molecular sieve composite film for separating methanol / dimethyl carbonate. The preparation process includes the following steps: 1. dissolving chitosan in solvent comprising glacial acetic acid and water at 20-40 deg.c to obtain 0.8-2.5 wt% concentration film casting chitosan solution; 2. adding certain amount of ZSM-5 molecular sieve to the film casting chitosan solution; 3. debubbling the solution after stirring; and 4. casting film on glass plate. Compared with traditional chitosan film, the chitosan / molecular sieve composite film has higher mechanical strength and higher infiltrating and vaporizing performance for separating methanol / dimethyl carbonate mixture.

Description

technical field [0001] The invention relates to polymer separation membrane technology, in particular to a preparation method of a chitosan / molecular sieve composite membrane of a pervaporation separation methanol / dimethyl carbonate azeotropic system. Background technique [0002] In recent years, a high-efficiency, energy-saving, pollution-free, and simple-to-operate pervaporation (PV) membrane separation technology has been developed rapidly. Simple, low energy consumption, no pollution and so on. For the separation of organic mixtures such as methanol / dimethyl carbonate, there are few researches at home and abroad. US Patent 5,292,917 discloses an extractive distillation process for distilling a mixture of methanol / DMC in the presence of dimethyl oxalate. Two rectification columns are used in series to separate DMC from methanol species. At the top of the first rectification column, the methanol is removed and the DMC / dimethyl oxalate mixture is fed to the second rectif...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D71/08B01D71/02C07C68/08C07C69/96C07C31/04
Inventor 曹义鸣刘兵兵刘健辉袁权
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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