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:
May. 14, 2002
Filed:
Nov. 22, 2000
Curt Zimmermann, Mauthausen, AT;
Helmut Sengstschmid, Linz, AT;
Willibald Scheuchenstuhl, Oswald/Freistadt, AT;
DSM Fine Chemicals Austria Nfg GmbH & CoKG, Linz, AT;
Abstract
A process for reducing the amount of nitrification-inhibiting sulfur compounds in reaction solutions obtained by the sulfur-compound-catalyzed conversion of &agr;,&bgr;-unsaturated carboxylic acids into the corresponding trans or cis isomer, in which an oxidizing agent is added in molar deficiency up to a maximum of twice the molar amount, based on the catalyst compound, to the reaction mixture obtained after the termination of the isomerization and then isolating the corresponding trans or cis isomer in a known manner and working it up and supplying the resultant process waste waters to a biological cleanup stage.