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:
Oct. 11, 2022
Filed:
Jan. 09, 2019
China Petroleum & Chemical Corporation, Beijing, CN;
Research Institute of Petroleum Processing, Sinopec, Beijing, CN;
Wencheng Tang, Beijing, CN;
Longsheng Tian, Beijing, CN;
Ming Zhao, Beijing, CN;
Siliang Gao, Beijing, CN;
Nan Yang, Beijing, CN;
Siyuan Qie, Beijing, CN;
Zhifeng Bian, Beijing, CN;
CHINA PETROLEUM & CHEMICAL CORPORATION, Beijing, CN;
RESEARCH INSTITUTE OF PETROLEUM PROCESSING, SINOPEC, Beijing, CN;
Abstract
A method for purification of a styrene-containing feedstock includes steps of introducing the styrene-containing feedstock into the middle of an extractive distillation column, and a solvent for the extractive distillation into the upper part of the column; discharging a raffinate oil from the top of the column, and a rich solvent rich in styrene from the bottom of the column. The rich solvent is then introduced into the middle of the solvent recovery column for vacuum distillation to obtain a crude styrene from the top of the solvent recovery column, and a lean solvent is discharged from the bottom of the solvent recovery column and recycled to the upper part of the extractive distillation column. A portion of the rich solvent is sent to a solvent purification zone for a liquid-liquid extraction using water to obtain a mixture of a styrene polymer and styrene.