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:
Dec. 10, 1985
Filed:
Jan. 17, 1985
Nancy K Stengle, Sweeny, TX (US);
James W Hobbs, Sweeny, TX (US);
Phillips Petroleum Company, Bartlesville, OK (US);
Abstract
In a fractional distillation process in which a sidedraw product stream is withdrawn from the fractional distillation column, the flow rate of the overhead product stream is controlled so as to increase the flow of the upper external reflux so as to drop as much as possible of the overhead product into the sidedraw product stream. However, valve position control is utilized to override the control of the flow of the overhead product stream, which is being controlled so as to substantially maximize the flow of the sidedraw product stream, if the valve controlling the flow of the upper external reflux approaches fully open such that control of the liquid level in the overhead accumulator associated with the fractional distillation process is not lost.