发明名称 |
Process for production sorbic acid |
摘要 |
A process for producing sorbic acid is described, by first reacting crotonaldehyde with ketene to prepare a polyester, then decomposing the polyester with hydrochloric acid, separating the crude sorbic acid from the reaction solution, and purifying the separated sorbic acid, said purifying step comprising the following steps: (a) continuously dissolving the crude sorbic acid in petroleum at a temperature in the range of from 100 DEG to 140 DEG C. while evaporating the residual water and hydrochloric acid from the solution of the sorbic acid in petroleum; (b) separating the tar content from the petroleum solution in a separation column at a temperature in the range of from 100 DEG to 140 DEG C.; and (c) subjecting the mixture of sorbic acid and petroleum to flash evaporation in a film-type evaporator at a reduced pressure in the range of from 20 to 60 mmHg, with the evaporation residue being withdrawn from the bottom of the evaporator and recycled to step (a).
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申请公布号 |
US4639294(A) |
申请公布日期 |
1987.01.27 |
申请号 |
US19850755518 |
申请日期 |
1985.07.16 |
申请人 |
DAICEL CHEMICAL INDUSTRIES, LTD. |
发明人 |
KAMEI, NOBORU;IKEDA, KINJIRO;AOYAMA, KEISHI;HAMANO, SEITARO |
分类号 |
C07C57/10;C07C51/00;C07C51/09;C07C51/42;C07C51/46;C07C67/00;(IPC1-7):B01D3/12 |
主分类号 |
C07C57/10 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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