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. 22, 2012
Filed:
Aug. 19, 2005
Werner Pietzonka, Therwil, CH;
Peter Ruckstuhl, Hölstein, CH;
Angela Wildermann, Bad Säckingen, DE;
DSM IP Assets B.V., Heerlen, NL;
Abstract
The invention relates to a process for the working-up of a vitamin E (VE)- and/or vitamin E acetate (VEA)-containing product stream, which is substantially characterized by purification of a vitamin E-containing product stream, acetylation of at least a part of the purified vitamin E and purification of at least a part of the acetylated vitamin E, the purification of vitamin E and vitamin E acetate preferably being effected by distillation, for example rectification. A preferred process according to the invention is characterized in that a vitamin E-containing product stream is fed to a first rectification column (), low-boiling products and unspecified isomers of vitamin E being taken off at the top () of this first rectification column virtually without loss of useful substance, and a purified, vitamin E-containing stream being taken off at the side () and/or at the bottom () of the rectification column (), at least a part of the side take-off or of the bottom take-off or at least a part of the side and bottom take-off is passed, for acetylation of vitamin E, into an acetylation stage (), at least a part of the product stream emerging from the acetylation stage is passed into a second rectification column () or is taken off as useful product having a purity of ≧92% by weight, and in a second rectification column, the VEA useful product is obtained as a side take-off having a purity of ≧97% by weight.