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. 01, 1985
Filed:
Aug. 31, 1983
Mary M Halliday, Old Ocean, TX (US);
Glen R Jackson, Bay City, TX (US);
Phillips Petroleum Company, Bartlesville, OK (US);
Abstract
In a fractional distillation process in which it is desired to maintain a desired overhead product composition and bottoms product composition, a set point for the flow rate of the external reflux to the fractional distillation column is increased or decreased by an incremental amount or is left constant based on whether the concentration by the heavy key component in the overhead product stream and the concentration of the light key component in the bottoms product stream are above a high limit, below a low limit, between the high limit and low limit or some combination thereof and also based on the relationship between a set point for the flow rate of the external reflux and a high limit for the flow rate of the external reflux. At the same time, a temperature set point for the fractional distillation column is increased or decreased by an incremental amount or is left constant depending on the same factors. Use of these set points for process control provides control of the overhead product composition and bottoms product composition without the use of analysis controllers.