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. 29, 2024
Filed:
Apr. 24, 2021
Covestro Deutschland Ag, Leverkusen, DE;
Covestro Deutschland AG, Leverkusen, DE;
Abstract
A process for purifying nitrobenzene-contaminated wastewater stream WWincludes stripping WWwith stripping gas SGin a stripping column to obtain wastewater stream WWcontaining reduced concentration of nitrobenzene relative to WW(c), and purifying WWin a wastewater treatment plant, wherein a target value (c) is specified for the nitrobenzene concentration in WW. A set of linear mathematical relationships is stored in a database for a combination of boundary conditions of nitrobenzene concentration in WW, temperature of WW, and temperature of SG. This set defines a range of concentrations of nitrobenzene in WWand includes a mathematical relationship corresponding to c, a mathematical relationship for a value of ccorresponding to 98% of c, and a linear mathematical relationship for a value of ccorresponding to 102% of c. The concentration of nitrobenzene is controlled in WW(c) by adjusting the flow rate of SG