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:
Jun. 11, 2019
Filed:
Nov. 24, 2016
Applicant:
Shell Oil Company, Houston, TX (US);
Inventors:
Kunquan Yu, Katy, TX (US);
Garo Garbis Vaporciyan, Houston, TX (US);
Assignee:
SHELL OIL COMPANY, Houston, TX (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C 68/06 (2006.01); C07C 68/08 (2006.01); C07C 69/96 (2006.01);
U.S. Cl.
CPC ...
C07C 68/065 (2013.01); C07C 68/08 (2013.01); C07C 69/96 (2013.01); C07C 2521/06 (2013.01); Y02P 20/127 (2015.11);
Abstract
A process for preparing a diaryl carbonate from a dialkyl carbonate and an aryl alcohol is disclosed. The process takes place in apparatus comprising at least two distillation columns, and at least one of the distillation columns is operated at subatmospheric pressure which is achieved using vacuum equipment.