Method of preparing composite membrane for gasoline desulphurization
A manufacturing method and composite membrane technology, which can be applied in the fields of refining by dialysis, chemical instruments and methods, membrane technology, etc., and can solve problems such as high consumption
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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 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 2.7g polyethylene glycol additive, and dissolve evenly , after filtering with a 300-mesh stainless steel mesh, the filtrate was allowed ...
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 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 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 additive, and di...
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