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:
Mar. 19, 2002
Filed:
May. 01, 1996
Applicant:
Inventors:
Mariola Rötzheim, Mulheim, DE;
Wolfgang Greb, Dinslaken, DE;
Wolfgang Zgorzelski, Oberhausen, DE;
Carl Dieter Frohning, Wesel, DE;
Klaus Denkmann, Oberhausen, DE;
Heinz Kalbfell, Schermbeck, DE;
Assignee:
Hoechst Aktiengesellschaft, , DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C02F 1/44 ;
U.S. Cl.
CPC ...
C02F 1/44 ;
Abstract
Wastewater from the aldolization reaction is purified by adjusting its pH to 0 to 6, followed by extraction with monohydric alcohols having at least 8 carbon atoms, hydrocarbons having at least 6 carbon atoms, and mixtures thereof. In some cases, adjustment of the pH causes the formation of an organic phase, which is separated from the remaining wastewater before extraction.