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Composite type membrane in use for penetrating, vaporizing and separating benzene from cyclohexane, and preparation method

A technology of pervaporation and composite membrane, applied in the field of composite membrane and its preparation, can solve the problems of increased permeation flux and low flux, and achieve the effects of low production cost, reduced energy consumption, and excellent separation performance

Inactive Publication Date: 2007-12-26
TSINGHUA UNIV
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  • Summary
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AI Technical Summary

Problems solved by technology

This kind of membrane can greatly increase the permeation flux while maintaining excellent separation performance, so as to overcome the disadvantages of low flux of other membrane materials.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Dissolve PEI in N-methylpyrrolidone solvent, prepare a film solution with a concentration of 20%, filter and defoam, and cast it on polyester non-woven fabric with a casting thickness of 150 μm, and gel in water at 20 °C Made of polyetherimide porous base membrane. Dissolve polydimethylsiloxane with a viscosity of 10,000 centipoise in n-heptane, with a mass content of 26%, and stir to fully dissolve it. Then add crosslinking agent orthosilicate ethyl ester, its mass ratio is 20%, catalyst dibutyltin dilaurate, its mass ratio is 4.5%, continue to stir and react for a period of time, after filtering and defoaming, the membrane liquid is coated on The treated polyetherimide base film is then cured at a certain temperature, and a composite film is obtained after drying, and the selectivity of the film to benzene and cyclohexane is measured. Separation performance tests were performed at a feed temperature of 77°C at the azeotropic point. See Table 2 for the following exam...

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PUM

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Abstract

The invention relates to a method for producing composite membrane used in filtering and separating benzene and cyclohexane, which belongs to the seepage vaporization membrane separation area. Its characteristic lies in: Taking the polyether imide as the basement membrane, and taking the dimethyl silicone polymer as coating compound membrane. The producing method is that, firstly, dissolves polyether imide as basement membrane, and then dissolves dimethyl silicone polymer as intermixture. Putting in cross-linking agent and catalyst in turn with stirring to make them to be well-proportioned and then painting the stratum disjunctum fluid on the basement membrane and heat them. The invention can combine the emission coating with the basement membrane tightly, which solves the abscission question in industry. It can separate the benzene and the cyclohexane efficiently.

Description

Technical field: [0001] The invention relates to a composite membrane used for pervaporation separation of benzene and cyclohexane and a preparation method thereof, belonging to the technical field of pervaporation membrane separation. Background technique: [0002] Benzene and cyclohexane are important organic chemical raw materials. Among them, cyclohexane is an important raw material for the production of chemical products such as cyclohexanol, cyclohexanone, polycaprolactam and polyhexamethylene adipamide, and is an important raw material for cellulose ether, resin, wax, grease, asphalt and rubber. excellent solvent. The methods for industrial production of cyclohexane can be divided into two categories: benzene hydrogenation and fractional distillation of petroleum hydrocarbon fractions. Among them, benzene hydrogenation is the main synthesis method of cyclohexane. At present, 80%-85% of cyclohexane in the world is produced by benzene hydrogenation. However, in order...

Claims

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Application Information

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IPC IPC(8): B01D69/12B01D71/64B01D71/70
Inventor 李继定陈剑叶宏林阳政
Owner TSINGHUA UNIV
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