Recovery of maleic anhydride
US4118403A · kind A · utility
17Cited by
1References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 18, 1976 |
| Grant date | Oct 3, 1978 |
| Priority date | — |
| Expiry date | Nov 18, 1996 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C51/573
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Maleic anhydride is recovered in high yields from gaseous mixtures containing the maleic anhydride in the vapor phase by cooling the gaseous mixture containing the maleic anhydride to a temperature above the dew point of water in the gaseous mixture, and then scrubbing the gaseous mixture with a solvent which comprises a phthalate ester, preferably dibutyl phthalate, and up to 10 weight percent phthalic anhydride. Thereafter, the maleic anhydride is stripped from the solvent in a one-step operation, and the solvent is thereafter recycled to the scrubbing step.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.