Patents by Inventor Dongyi Hong

Dongyi Hong has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Method for preparing bisphenol A
    Patent number: 7989666
    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.
    Type: Grant
    Filed: September 24, 2004
    Date of Patent: August 2, 2011
    Assignee: China Petroleum & Chemical Corporation
    Inventors: Dongyi Hong, Jidong Zhou, Jinlai Qin, Xuelei Li, Zhenwei Yao, Hongjiang Zhang, Cuiyun Liu, Weihua Fan