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US 2011/0218344 A1Published application
Production method of n-vinyl-2-pyrrolidone
AssigneeNippon Shokubai Co., Ltd.
InventorsHideto SUGIURA, Toru Inaoka, Shigeyuki Nozaki, Yoshihisa Oka
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Abstract
A method for producing N-vinyl-2-pyrrolidone by crystallization including: controlling a water content in a feed N-vinyl-2-pyrrolidone solution at an inlet of a crystallizer so as to be not lower than 0.7% by weight and not higher than 10% by weight based on the total weight of the N-vinyl-2-pyrrolidone solution; and supplying the feed N-vinyl-2-pyrrolidone solution to a crystallization process.
Claims5
A method for producing N-vinyl-2-pyrrolidone by crystallization comprising:
- controlling a water content in a feed N-vinyl-2-pyrrolidone solution at an inlet of a crystallizer so as to be not lower than 0.7% by weight and not higher than 10% by weight based on the total weight of the N-vinyl-2-pyrrolidone solution;
- and
- supplying the feed N-vinyl-2-pyrrolidone solution to a crystallization process.
Dependencies are inferred from the claim text.