Recovery of alkylene glycols by distillation with aqueous organic acid
US4028195A · kind A · utility
7Cited by
4References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 12, 1975 |
| Grant date | Jun 7, 1977 |
| Priority date | — |
| Expiry date | Sep 12, 1995 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C29/82
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Ethylene glycol or 1,2-propylene glycol contained in mixtures with lower carboxylate esters of the glycol are separated from such mixtures by fractional distillation of the mixtures with the addition to the lower portion of the distillation zone of aqueous formic acid and/or acetic acid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.