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Process for preparing polyacrylonitrile-grafted modified cellulose membrane for gasoline desulfurization

A technology of polyacrylonitrile and graft modification is applied in the field of preparation technology of polyacrylonitrile graft-modified cellulose membrane for gasoline desulfurization, and can solve the problem that there is no great economic advantage, high equipment investment cost and no application prospect. and other problems, to achieve the effect of economical grafting rate, good desulfurization performance, and mature method.

Inactive Publication Date: 2010-06-09
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the permeate flux is too small, even if the membrane has a very high sulfur enrichment factor, there is no prospect of application in industrial production, because the lower permeate flux usually needs to be compensated with a very large membrane area, resulting in equipment investment costs Huge, the operation energy consumption is too high, so that the membrane desulfurization technology does not have much economic advantage compared with other desulfurization technologies

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: 5 g of hydroxymethyl cellulose and 6 g of paraformaldehyde were dissolved in 200 ml of dimethyl sulfoxide solvent at room temperature, and the mixed solution was stirred rapidly at 90 to 100° C. for 30 minutes, and then heated at 130° C. Stir at a slow speed for about 10 minutes under the conditions, and cool it for later use; add 0.8g ammonium persulfate to the cooled dimethyl sulfoxide solution, pass nitrogen gas at 20°C for about 30 minutes, add 5g acrylonitrile monomer and stir for 3 hours, and react The temperature is 40°C; the reaction system is terminated by adding hydroquinone; after the reaction, the reaction solution is slowly dropped into rapidly stirred deionized water for precipitation, and the precipitated product is dried at 50°C for later use.

[0023] 5 g of the obtained cellulose-polyacrylonitrile graft copolymer was dissolved in 45 ml of N, N-dimethylformamide, and kept stirring for 2 days under sealed conditions to finally obtain a uniform,...

Embodiment 2

[0025] Example 2: Dissolve 5 g of hydroxyethyl cellulose and 6 g of paraformaldehyde in 200 ml of dimethyl sulfoxide solvent at room temperature, and stir the mixed solution rapidly at 90 to 100° C. for 30 minutes, then at 130° C. Stir at a slow speed for about 10 minutes under the same conditions, and cool it for later use; add 0.4g of azobisisobutyronitrile to the cooled dimethyl sulfoxide solution, pass nitrogen gas at 20°C for about 30 minutes, add 5g of acrylonitrile monomer and stir for 3 Hours, the reaction temperature is 40°C; hydroquinone is added to the reaction system to terminate the reaction; after the reaction, the reaction solution is slowly dropped into rapidly stirred deionized water for precipitation, and the precipitated product is dried at 50°C for later use.

[0026] Dissolve 5 g of the obtained cellulose-polyacrylonitrile graft copolymer in 45 ml of dimethyl sulfoxide, and keep stirring for 1 to 2 days under sealed conditions to finally obtain a uniform an...

Embodiment 3

[0028] Example 3: Dissolve 5g of hydroxypropylmethylcellulose and 6g of paraformaldehyde in 200ml of dimethyl sulfoxide solvent at room temperature, stir the mixed solution rapidly at 90-100°C for 30 minutes, and then Stir at a slow speed for about 10 minutes at 130°C, cool for later use; add 0.4g of benzoyl peroxide to the cooled dimethyl sulfoxide solution, pass nitrogen gas at 20°C for about 30 minutes, add 5g of acrylonitrile monomer and stir After 3 hours, the reaction temperature was 40°C; hydroquinone was added to the reaction system to terminate the reaction; after the reaction, the reaction solution was slowly dropped into rapidly stirred deionized water for precipitation, and the precipitated product was dried at 50°C for later use.

[0029] Dissolve 5 g of the obtained cellulose-polyacrylonitrile graft copolymer in 45 ml of N, N-dimethylformamide, and keep stirring for 1 to 2 days under sealed conditions to finally obtain a uniform, transparent cellulose-polypropylen...

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Abstract

The invention relates to a process for preparing a polyacrylonitrile-grafted modified cellulose membrane for gasoline desulfurization. The invention adopts the technical scheme that the process comprises the following steps: 1) dissolving a cellulose-polyacrylonitrile grafted copolymer into a certain amount of solvent, continuously stirring the mixture under a sealed condition to obtain even and transparent cellulose-polyacrylonitrile grafted copolymer solution, and then filtering, standing and degassing the membrane preparation solution; and 2) coating the obtained copolymer solution on a glass plate to form a membrane, volatilizing the solvent, drying the membrane, putting the membrane into deionized water to separate the membrane from the glass plate, and drying the membrane for later use. The membrane manufactured by the invention has the characteristic of obvious micro-phase separation structure, wherein the polyacrylonitrile side chain plays a role in supporting the membrane structure and the crosslinked cellulose main chain and inhibiting the swelling of the membrane; and the cellulose chain segment is a main selective permeation material of the membrane, the adjustment to permeability and selectivity depends on the change of contents of different chain segments, and the membrane shows good separation performance and mechanical stability in the permeation-evaporation separation of the gasoline desulfurization.

Description

1. Technical field: [0001] The invention relates to the technical field of pervaporation membrane separation, in particular to a preparation process of polyacrylonitrile grafted modified cellulose membrane for gasoline desulfurization. 2. Background technology: [0002] The use of pervaporation membranes in the field of gasoline desulfurization began with the S-Brane technology of Grace Davison Company. Compared with traditional gasoline desulfurization technology, membrane gasoline desulfurization technology has the advantages of low investment and operating costs, deep desulfurization, less octane loss, and easy expansion and construction. Since Grace Davison first proposed S-Brane technology at the NPRA annual meeting in 2002, companies such as Exxon Mobil, TransIonics and Marathon Oil have also successively invested in the development of pervaporation membrane gasoline desulfurization projects. Domestic research on this project mainly includes Kong Ying from China Unive...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/42B01D67/00C10G31/11
Inventor 孔瑛卢福伟杨金荣
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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