Process for the working-up of a vitamin E- and vitamin E-acetate- containing mixture or products stream
US8183396B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 19, 2005 |
| Grant date | May 22, 2012 |
| Priority date | — |
| Expiry date | Apr 28, 2029 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61P3/02
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
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 (105), low-boiling products and unspecified isomers of vitamin E being taken off at the top (105a) of this first rectification column virtually without loss of useful substance, and a purified, vitamin E-containing stream being taken off at the side (105b) and/or at the bottom (105c) of the rectification column (105), 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 (111), at least a part of the product stream emerging from the acetylation sta…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.