Process for the distillative purification of citral
US5094720A · kind A · utility
1Cited by
6References
18Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 18, 1990 |
| Grant date | Mar 10, 1992 |
| Priority date | — |
| Expiry date | Oct 18, 2010 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C45/82
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A method is disclosed for enhancing the purification of citral by fractional distillation by inhibiting the formation of isocitrals from isomerization of citral during the distillation process. The method involves reducing the pH of a mixture containing citral to inhibit the formation of isocitrals from citral upon heating, such as in distillation. Lowering the pH below 7 reduces formation of isocitrals, but a pH of about 4 to 5 is especially preferred. Most preferably, this pH adjustment is accomplished by addition of an acid with a pKa between about 4 and 5.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.