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. 23, 1983
Filed:
Oct. 30, 1981
James W Hobbs, Sweeny, TX (US);
Phillips Petroleum Company, Bartlesville, OK (US);
Abstract
A fractional distillation process, in which the flow rate of the external reflux is utilized to control the bottoms product composition, is controlled so as to maintain a desired bottoms product composition to the extent that maintaining the desired bottoms product composition does not cause a process constraint to be violated. A plurality of actual process conditions are compared to process constraints for those process conditions to determine if the flow rate of the external reflux should remain the same, be increased by an incremental amount or be decreased by an incremental amount. The order of the comparison of process constraints to actual process conditions is such that the most important comparison will control the external reflux flow rate if that comparison indicates that a process constraint has been violated.