| Original document(9 pages) 中文版 |
In a vanillin production process, a liquid mixture containing vanillin and water is extracted with carbon dioxide at a temperature from 0 DEG to 110 DEG C. and a pressure from 30 to 400 bar, after which the vanillin is separated. The carbon dioxide-containing vanillin is led at the extraction temperature and pressure through an aqueous solution of sulphite or hydrogen sulphite, this solution is then acidified with sulphuric acid to a pH value between 2 and 4, and the vanillin-free carbon dioxide is returned to the extraction stage. |
Application Number
申请号 |
86106327 |
Application Date
申请日 |
1986.09.19 |
| Title 名称 |
Process for the preparation of vanillin |
Publication Number
公开号 |
1010929 |
Publication Date
公开日 |
1987.05.13 |
| Approval Pub. Date |
|
Granted Pub. Date |
|
| International Classification 分类号 |
C07C45/80;C07C47/56 |
Applicant(s) Name
申请人 |
Fried, Krupp Gesellschaft Mit Beschrankter Haftung (DE) Altendorfer Strasse 103, |
| Address 地址 |
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| Inventor(s) Name 发明人 |
Hubert Coenen;Reinhard Konrad |
| Attorney & Agent 代理人 |
LIN BAINAN REN ZONGHUA |
| More information 更 多 信 息 |
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