Purification method of terephthal aldehyde
US7183442B2 · kind B2 · utility
1Cited by
3References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 6, 2005 |
| Grant date | Feb 27, 2007 |
| Priority date | — |
| Expiry date | Dec 6, 2025 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C45/81
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The present invention relates to a method for preparing high-purity terephthalaldehyde from terephthalaldehyde crystal containing impurities by recrystallization using an antisolvent. Low-purity terephthalaldehyde prepared by a conventional method, which contains a small amount of impurities, is dissolved in a solvent and recrystallized using water as antisolvent to obtain high-purity terephthalaldehyde. The invention is significantly advantageous in using water only as antisolvent. Also, the purification process takes short time and is economical and environment-friendly.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.