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Preparation method of polyvinyl chitosan mixed film

A technology of polyvinyl alcohol and chitosan, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of increased investment, poor safety, difficult operation, etc., and achieve high mechanical strength and good separation Excellent performance and chemical stability

Inactive Publication Date: 2007-08-01
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

Compared with extractive distillation, the pressurized distillation method requires a large increase in investment, difficult operation and poor safety.

Method used

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  • Preparation method of polyvinyl chitosan mixed film
  • Preparation method of polyvinyl chitosan mixed film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Accurately weigh 5g of PVA (degree of alcoholysis: 99.8%-100%), dissolve it in 95g of deionized water at 90°C, and stir evenly for 4h. After the PVA is completely dissolved, filter the solution to remove some undissolved impurities. Set aside. Dissolve 1.5g of CS (low molecular weight, deacetylation degree 75%-85%) in 2% acetic acid aqueous solution at 25°C, stir evenly, make 1wt% CS solution, filter to remove some undissolved Impurities. Weigh 3.2g of 5wt% PVA solution and 8g of 1wt% CS solution respectively, mix them at room temperature, and stir evenly for 3 hours. on the glass plate (the glass plate should be horizontal), the temperature of the glass plate is kept at 40°C, the solvent is volatilized for 12 hours, the film is peeled off from the glass plate, and heat treated in a vacuum oven at 120°C for 4 hours to obtain PVA:CS=2:1 blend film.

[0048] The membrane is pervaporated to separate methanol / DMC azeotrope (methanol 70wt%, DMC30wt%), the raw material sid...

Embodiment 2

[0050] Weigh 2.4g of 5wt% PVA solution and 12g of 1wt% CS solution respectively, mix at room temperature, stir evenly for 2 hours, after the solution is uniformly clarified, perform vacuum degassing for 4 hours, and then pour the casting solution into a clean glass plate (the glass plate should be horizontal), the temperature of the glass plate is kept at 40°C, the solvent is volatilized for 14 hours, the film is peeled off from the glass plate, and heat treated in a vacuum oven at 140°C for 2 hours to obtain PVA:CS=1:1 blend film.

[0051] 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 4.1, pervaporation separation index (PSI value) 324.6g / (m 2 h).

Embodiment 3

[0053] Weigh 16g of 1wt% CS solution and 1.6g of 5wt% PVA solution respectively, mix them at room temperature, and stir evenly for 2 hours. plate (the glass plate should be horizontal), the temperature of the glass plate is kept at 40°C, the solvent is volatilized for 12 hours, the film is peeled off from the glass plate, and heat treated in a vacuum oven at 120°C for 2 hours to obtain PVA:CS=1:2 blend film.

[0054] 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 5.0, pervaporation separation index (PSI value) 660.8g / (m 2 h).

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Abstract

The invention involves a preparation method used for separating the polyvinyl alcohol / chitosan mixing film of methanol / dimethyl carbonate, the preparation process is as follows: 1) dissolving the polyvinyl alcohol with the deionized water as solvent in 80 ~ 100 degree C and gaining uniform casting film solution which polyvinyl alcohol concentration is 5wt%; 2) dissolving the chitosan with the glacial acetic acid and deionized water as solvent in 20-40DEG C and gaining uniform casting film solution which chitosan concentration is 1wt%; 3) according certain radio mixing the ratio of PVA and chitosan solution uniformly and debubbling; 4) making film on the glass plate with casting method; 5) thermal treating the film 2~4 hours in 120 ~ 150 degree C. Compared with traditional separation methods, the method has some characteristics such as high one-time separation degree, simple precess, low energy consumption and pollution-free.

Description

technical field [0001] The invention relates to pervaporation separation membrane technology, in particular to a method for pervaporation separation of methanol / dimethyl carbonate azeotropic system with polyvinyl alcohol / chitosan blend membrane. Background technique [0002] The pervaporation (PV) method is a method of separating the two components through permeation and vaporization by using the difference in solubility and diffusion coefficient of the two components in the liquid in the membrane. The study of pervaporation can be traced back to the beginning of the 20th century, but it was not until the 1980s that this emerging membrane separation technology received widespread attention. Compared with conventional separation methods such as distillation, extraction, and dialysis, pervaporation has the characteristics of high degree of one-time separation, simple process, low energy consumption, and no pollution. It is mainly used in: dehydration of organic solvents, dehyd...

Claims

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Application Information

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IPC IPC(8): B01D71/38B01D67/00
Inventor 曹义鸣刘兵兵袁权
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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