Method for preparing organic-inorganic hybrid evaporation alcohol permselective membrane

A technology of preferential alcohol permeation membrane and pervaporation, which is applied in the field of preparation of organic-inorganic hybrid pervaporation preferential alcohol permeation membrane, can solve the problems of affecting membrane separation stability, easy formation of defects in phase interface, etc., so as to avoid the increase of interface defects. , Improve separation performance, weaken the effect of interface defects

Active Publication Date: 2009-09-02
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

The molecular sieve and silicone rubber in the membrane obtained by this method are in a microscopically completely separated two-phase state, and defects are easily formed between the phase interfaces, which affects the separation stability of the membrane.

Method used

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  • Method for preparing organic-inorganic hybrid evaporation alcohol permselective membrane
  • Method for preparing organic-inorganic hybrid evaporation alcohol permselective membrane
  • Method for preparing organic-inorganic hybrid evaporation alcohol permselective membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The modified microporous molecular sieve was prepared according to the aforementioned method for preparing the modified microporous molecular sieve. Table 1 shows the modification reagents and modification conditions used in the preparation of six modified microporous molecular sieves. The obtained modified microporous molecular sieves are all in the form of particles, with a particle size of less than 1 μm and a specific surface area of ​​280-300 m 2 / g.

[0023] Table 1 Modification reagents and modification conditions used in the preparation of modified microporous molecular sieves

[0024]

Embodiment 2

[0026] Using n-heptane as a solvent, the hydroxyl silicone rubber was blended with the modified microporous molecular sieve 1 obtained in Example 1, the mass percent of the silicone rubber was 18%, and the mass percent of the modified microporous molecular sieve 1 was 26%. The above mixing system is vigorously stirred for 6-8 hours to ensure that the modified microporous molecular sieve is uniformly dispersed in the silicone rubber, and after the solution is left to stand for 30 minutes, the modified microporous molecular sieve has no sedimentation phenomenon. Coat the mixed solution on a plexiglass plate to form a film, place it at room temperature for 8 hours to volatilize the solvent, then keep it in a vacuum oven at 60°C for 12 hours, take out the film after cooling down, soak it in ethanol aqueous solution overnight, and test the film performance . The membrane obtained is under 36 ℃, 220Pa vacuum degree, to the selectivity of the ethanol / water solution of 5.97 (ml / ml)% t...

Embodiment 3

[0028] Using n-heptane as a solvent, the hydroxyl silicone rubber was blended with the modified microporous molecular sieve 1 obtained in Example 1, the mass percent of the silicone rubber was 21.6%, and the mass percent of the modified microporous molecular sieve 1 was 32.4%. The above mixing system is vigorously stirred for 6-8 hours to ensure that the modified microporous molecular sieve is uniformly dispersed in the silicone rubber, and after the solution is left to stand for 30 minutes, the modified microporous molecular sieve has no sedimentation phenomenon. The mixed solution was coated on a steel plate to form a film, and placed at room temperature for 8 hours to evaporate the solvent, and then kept in a vacuum oven at 100°C for 12 hours, the film was cooled and taken out, soaked in ethanol aqueous solution overnight, and the film performance was tested. The obtained membrane has a selectivity of 26 to a concentration of 5.97 (ml / ml)% ethanol / water solution at 36°C and ...

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Abstract

The invention relates to a method for preparing an organic-inorganic hybrid evaporation alcohol permselective membrane used for the separation of alcohol/water system. Micropore molecular sieves are modified chemically, organic functional groups are led in the structure and the modified micropore molecular sieves and silicone rubber are mixed and coated to prepare the organic-inorganic hybrid evaporation alcohol permselective membrane. The method is characterized in that: the organic functional groups in the modified micropore molecular sieves can enhance the interaction force between the modified micropore molecular sieves and the silicone rubber, or form stable compound bond phase between the two substances, thus weakening the boundary defect between the inorganic and organic phases, improving the separation performance of the membrane and avoiding the defects of the deterioration of boundary defect between the inorganic and organic phases and unstability of the membrane due to compression during the use process of the membrane.

Description

technical field [0001] The invention relates to a preparation method of an organic-inorganic hybrid pervaporation preferential alcohol permeation membrane used for the separation of alcohol / water system. Background technique [0002] Pervaporation is a new membrane separation technology with high efficiency, low energy consumption and low investment. It is a membrane process that uses the adsorption and dissolution of various components in the liquid mixture and the difference in diffusion properties in the membrane to achieve component separation. It can be used for the removal of trace moisture in organic solvents, and can also be used for low concentration. Concentration of organic aqueous solutions. In many cases, it can effectively replace traditional separation methods such as distillation and extraction. Pervaporation is characterized by low energy consumption, environmental protection, simple operation, and mild separation conditions. Therefore, it is especially s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/02B01D71/70B01D61/36C07C29/76
CPCB01D71/70B01D69/148B01D71/028B01D69/02C07C29/76B01D61/362
Inventor 苏仪伊守亮周浩力万印华
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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