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:
Jul. 18, 2023
Filed:
Feb. 23, 2022
Covestro Deutschland Ag, Leverkusen, DE;
Covestro Llc, Pittsburgh, PA (US);
Bernd Pennemann, Bergisch Gladbach, DE;
Shuang Liang, Houston, TX (US);
Zhangyong Ming, Shanghai, CN;
Juergen Bausa, Kürten, DE;
Covestro Deutschland AG, Leverkusen, DE;
Covestro LLC, Pittsburgh, PA (US);
Abstract
The present invention provides a method for operating a rectification column () for separating a mixture (S) containing a component A and a component B having a boiling point higher than that of the component A at an operating pressure of the rectification column () which is lower than ambient pressure, wherein the method comprises a step for controlling the mass fraction of the component B in the product stream of the component A (P) to a value within a first target range from 0.1% to 5.0% and the mass fraction of the component A in the product stream of the component B (P) to a value within a second target range from 0.1% to 5.0%, wherein the control is carried out as a function of a controlling temperature (TC) for which a setpoint TCis calculated according to the equation TC=T2+F·(T1−T2), where F is a factor which is in the range from 0.1 to 0.9 and T1 and T2 are reference temperatures, wherein in the case of a deviation in the measured control temperature (TC) from its setpoint TCbeing found the control temperature (TC) is readjusted to the setpoint TCby varying one or more of the following actuating variables: (i) heating of the column bottom () by the evaporator (), (ii) the mass flow {dot over (m)}of the reflux (A) fed back into the rectification column, (iii) the mass flow {dot over (m)}of the product stream Pand (iv) the mass flow {dot over (m)}of the product stream P