Title:
VANILLIN PRODUCTION PROCESS
Document Type and Number:
WIPO Patent Application WO1987001695
Kind Code:
A3
Abstract:
A process for the extraction of vanillin by means of the extraction from a vanillin-containing, water-containing, liquid mixture of substances with carbon dioxide at a temperature of 0 DEG to 110 DEG C. as well as a pressure of 30 to 400 bar and a subsequent separation of vanillin is described. It is contemplated that with this process the vanillin-containing carbon dioxide is passed through an aqueous hydrogen sulfite- or sulfite-solution at the extraction temperature and the extraction pressure, that this solution is subsequently acidified with sulfuric acid to a pH value of 2 to 4, and that the vanillin-free carbon dioxide is fed back into the extraction stage.
Inventors:
COENEN HUBERT (DE)
KONRAD REINHARD (DE)
KONRAD REINHARD (DE)
Application Number:
PCT/EP1986/000526
Publication Date:
July 02, 1987
Filing Date:
September 12, 1986
Export Citation:
Assignee:
KRUPP GMBH (DE)
COENEN HUBERT (DE)
KONRAD REINHARD (DE)
COENEN HUBERT (DE)
KONRAD REINHARD (DE)
International Classes:
C07C45/00; C07C45/78; C07C45/80; C07C47/58; C07C45/82; C07C67/00; (IPC1-7): C07C47/58; C07C45/78; C07C45/82
Foreign References:
| FR2578246A1 | 1986-09-05 | |||
| DE1493190A1 | 1969-09-18 | |||
| US2069185A | 1937-01-26 | |||
| US4021493A | 1977-05-03 |
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