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Method of preparing composite membrane for gasoline desulphurization

A manufacturing method and composite membrane technology, which can be used in refining by dialysis, chemical instruments and methods, membrane technology, etc., and can solve problems such as high consumption

Active Publication Date: 2009-01-07
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although hydrodesulfurization can effectively remove sulfides that are difficult to remove such as thiophenes, it generally has the following disadvantages: (1) RON is reduced by 7 to 10 units; (2) MON is reduced by 3 to 4 units; ( 3) Olefin addition reaction occurs, which consumes a large amount of hydrogen
For reasons of confidentiality, the above companies have only applied for patents on the membrane gasoline desulfurization process, but have not publicly reported on the membrane separation materials and membrane preparation processes for gasoline desulfurization

Method used

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  • Method of preparing composite membrane for gasoline desulphurization
  • Method of preparing composite membrane for gasoline desulphurization
  • Method of preparing composite membrane for gasoline desulphurization

Examples

Experimental program
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Effect test

Embodiment 1

[0023] ①. Preparation method of support membrane:

[0024] Dissolve 4.95g (0.025mol) of diphenylmethanediamine (MDA) in 80mL of N,N-dimethylacetamide, stir electromagnetically, and add 5.45g (0.025mol) in batches to the solution under nitrogen protection Pyromellitic dianhydride (PMDA), stirred and reacted at room temperature for 8 hours to obtain a polyamic acid solution. Add 6 mL of acetic anhydride and 9 mL of triethylamine under rapid stirring, and stir at room temperature for 6 hours to complete partial imidization. The reaction solution is precipitated in water to obtain a light yellow product, which is washed with water and dried at 50°C to constant weight. Take 10g of the dried polyimide synthesized above, and dissolve it in a mixed solvent of 20mL N, N-dimethylacetamide and 16mL acetone with electromagnetic stirring at room temperature, add 2.2g polyvinylpyrrolidone additive, and dissolve evenly. After filtering with a 300-mesh stainless steel mesh, the filtrate was...

Embodiment 2

[0030] ① Preparation method of support membrane:

[0031] 5.658g (0.025mol) of 3,3'dimethyldiphenylmethanediamine (DMMDA) was dissolved in 80-mL of dimethylformamide, magnetically stirred, and 11.106g ( 0.025mol) of hexafluorodianhydride (6FDA), stirred and reacted at room temperature for 8 hours to obtain a polyamic acid solution with a concentration of 17.32wt%. Add 6 mL of acetic anhydride and 9 mL of triethylamine under rapid stirring, and stir at room temperature 6 Partial imidization was completed within 2 hours, and the reaction solution was precipitated in water to obtain a pale yellow product, which was washed with water and dried at 50°C to constant weight. Take 10g of the dried polyimide synthesized above, and dissolve it in a mixed solvent of 20mL N, N-dimethylacetamide and 16mL acetone with electromagnetic stirring at room temperature, add 2.7g polyethylene glycol additive, and dissolve evenly , after filtering with a 300-mesh stainless steel mesh, the filtrate ...

Embodiment 3

[0037] ① Preparation method of support membrane:

[0038] 5g (0.025mol) of 4,4'-diaminodiphenyl ether (ODA) was dissolved in 80-mL of dimethyl sulfoxide, magnetically stirred, and 8.0558g (0.025mol) was added in batches to the solution under nitrogen protection Benzophenone tetra-acid dianhydride (BTDA) was stirred and reacted at room temperature for 8 hours to obtain a polyamic acid solution, and the concentration of this solution was 14.03 wt%. Add 6 mL of acetic anhydride and 9 mL of triethylamine under rapid stirring, and stir at room temperature 6 Partial imidization was completed within 2 hours, and the reaction solution was precipitated in water to obtain a pale yellow product, which was washed with water and dried at 50°C to constant weight. Take 10 g of the dried polyimide synthesized above, and dissolve it in a mixed solvent of 20 mL of N, N-dimethylacetamide and 16 mL of acetone under electromagnetic stirring at room temperature, add 1.6 g of polyvinyl alcohol addi...

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Abstract

The present invention provides a method for manufacturing a composite membrane for gasoline desulfurization. The composite membrane is manufactured by compounding an epidermal layer membrane material and a support layer membrane material. The epidermal layer membrane material is polyethylene glycol or polyethylene oxide, which has strong permselectivity of sulfide in the gasoline; the support layer adopts a sodium polyimide filter membrane or an ultrafiltration membrane with temperature resistance and organic solvent resistance, which can resist complicated components of the gasoline and 150 DEG C high temperature. Adopting the appropriate composite membrane preparation can prepare a composite membrane with ultrathin epidermal layer and no defect which can resist high temperature and hydrocarbon. The composite membrane can be used to for gasoline desulfurization. Under the condition of 110 DEG C feeding temperature and 1.5KPa membrane posterior pressure, the sulfur enrichment factor of the prepared composite membrane for the gasoline with 1000 Mu g / g sulfur content is larger than 4 and the permeation flux is larger than 40kg.Mu m / m< 2 >h.

Description

technical field [0001] The invention relates to a method for manufacturing a composite membrane for gasoline desulfurization, which belongs to the selection of pervaporation membrane materials, the composite membrane preparation technology and its application direction. Its main technical feature is to screen the skin layer membrane material and support layer membrane material through the pervaporation membrane material selection theory and pervaporation test, select the appropriate composite membrane preparation process, and prepare a defect-free ultra-thin skin layer. class of composite films. The composite membrane prepared by the invention can be used for gasoline desulfurization, especially the removal of sulfide in gasoline. Background technique [0002] With the continuous improvement of human's requirements for the quality of living environment, countries around the world have formulated more and more stringent standards for sulfur content in fuel oil due to the nee...

Claims

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Application Information

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IPC IPC(8): C10G31/11B01D69/12B01D71/64
Inventor 孔瑛林立刚王刚杨金荣吴超波王云芳史德青
Owner PETROCHINA CO LTD
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