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:
Jun. 12, 2012
Filed:
Dec. 13, 2006
Armin Diefenbacher, Freisbach, DE;
Hans-georg Goebbel, Kallstadt, DE;
Stefan Bitterlich, Dirmstein, DE;
Hartwig Voss, Frankenthal, DE;
Henning Schultz, Mannheim, DE;
Anna Forlin, Vigonza, IT;
Renate Patrascu, Stade, DE;
Armin Diefenbacher, Freisbach, DE;
Hans-Georg Goebbel, Kallstadt, DE;
Stefan Bitterlich, Dirmstein, DE;
Hartwig Voss, Frankenthal, DE;
Henning Schultz, Mannheim, DE;
Anna Forlin, Vigonza, IT;
Renate Patrascu, Stade, DE;
BASF Aktiengesellschaft, Ludwigshafen, DE;
The Dow Chemical Company, Midland, MI (US);
Abstract
The present invention relates to a process for separating at least one propylene glycol from a mixture (M) comprising water and said propylene glycol, said process comprising (I) evaporating the mixture in at least two evaporation and/or distillation stages at decreasing operating pressures of the evaporators and/or distillation columns obtaining mixture (M') and mixture (M″); (II) separating the mixture (M′) obtained in (I) in at least one further distillation step, obtaining a mixture (M-I) comprising at least 70 wt.-% of water and a mixture (M-II) comprising less than 30 wt.-% of water.