Recovery of acrylic acid and/or ethyl acrylate from black acid
US4968834A · kind A · utility
4Cited by
5References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 7, 1990 |
| Grant date | Nov 6, 1990 |
| Priority date | — |
| Expiry date | May 7, 2010 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C67/54
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Black acid or the sulfuric acid residue obtained in the manufacture of ethyl acrylate by reaction of ethylene and acrylic acid in the presence of sulfuric acid is heated and distilled in a distillation zone in the presence of a solvent to form an overhead mixture comprising an organic phase containing ethyl acrylate and solvent, and an aqueous phase containing water, solvent and acrylic acid. The aqueous phase is recycled to the distillation zone for recovery of additional acrylic acid value from the organic phase.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.