The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 02, 2011
Filed:
Sep. 24, 2004
Dongyi Hong, Beijing, CN;
Jidong Zhou, Beijing, CN;
Jinlai Qin, Beijing, CN;
Xuelei LI, Beijing, CN;
Zhenwei Yao, Beijing, CN;
Hongjiang Zhang, Beijing, CN;
Cuiyun Liu, Beijing, CN;
Weihua Fan, Beijing, CN;
Dongyi Hong, Beijing, CN;
Jidong Zhou, Beijing, CN;
Jinlai Qin, Beijing, CN;
Xuelei Li, Beijing, CN;
Zhenwei Yao, Beijing, CN;
Hongjiang Zhang, Beijing, CN;
Cuiyun Liu, Beijing, CN;
Weihua Fan, Beijing, CN;
China Petroleum & Chemical Corporation, Beijing, CN;
Abstract
The present invention discloses a method for preparing bisphenol A, comprising the following steps: transferring phenol and acetone into a reaction zone charged with condensation catalyst, obtaining a stream containing bisphenol A after reaction; transferring the obtained stream containing bisphenol A into a rectification zone, obtaining a product fraction primarily containing bisphenol A and phenol; and transferring the product fraction primarily containing bisphenol A and phenol into a crystallization zone to obtain a bisphenol A product; wherein a water-depleted fraction primarily containing phenol, bisphenol A and acetone is obtained from the rectification zone, and said water-depleted fraction is cooled and returned as a cycled stream to the reaction zone. Through cycling the water-depleted fraction to the reaction zone, the water content within the reaction zone can be reduced, the catalytic activity can be maintained and the reaction temperature rise can be controlled, thus the conversion of acetone and the selectivity of reaction can be improved accordingly.