Method for the production of N-vinyl-2-pyrrolidone by vinylation
AssigneeIndustrial Technology Research Institute
InventorsShiao-Jung Chu, Pine-Sci Kuo, Chu-Chang Dai, Hsi-Yen Hsu, Ching-Tang Lin
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Abstract
The present invention relates to a method for the production of N-vinyl-2-pyrrolidone with high selectivity. The method is characterized in subjecting 2-pyrrolidone and acetylene to vinylation by using hydroxy end-capped ether oligomers having a molecular weight less than 1000 or linear diols having at least 4 carbon atoms as co-catalysts under the catalyzation of alkali metal salts. At a vinylation temperature of 100.degree.-200 .degree. C., a reaction pressure of 7.5-30 atm and a reaction time period of 3-20 hours, N-vinyl-2-pyrrolidones are obtained with yields above 90%.
Claims9
A method for the production of N-vinyl-2-pyrrolidone by vinylation, comprising the following steps:
- (a) reacting 2-pyrrolidone with acetylene in the presence of hydroxy end-capped ether oligomers having a molecular weight of less than 1000 or linear diols having at least 4 carbon atoms as co-catalysts under the catalyzation of alkali metal salts at a temperature ranging from 100.degree. C. to 200.degree. C. and a pressure between 7.5 and 30 atmosphere pressure;
- and
- (b) separating the N-vinyl-2-pyrrolidone;
- wherein the improvement is characterized in that:
- (i) said ether oligomers having the formula of HO(CH.sub.2 CH.sub.2 CH.sub.2 CH.sub.2 O).sub.n H, where n=1.about.14;
- and
- (ii) said linear diols having the formula of HO--(CH.sub.2).sub.n --OH, where n.gtoreq.4.
Dependencies are inferred from the claim text.