Purification of acrylic acid obtained by catalytic oxidation of propylene
US6281386A · kind A · utility
8Cited by
2References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 25, 1999 |
| Grant date | Aug 28, 2001 |
| Priority date | — |
| Expiry date | May 25, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C51/48
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The method consists in extracting acrylic acid by countercurrent filtration washing of reaction gases by at least a hydrophobic absorbing heavy solvent, then recuperating the purified acrylic acid from the solution obtained at the end of this extracting step. As hydrophobic absorbing heavy solvent at least a hydrophobic aromatic compound is used having: a boiling point under atmospheric pressure between 260.degree. C. and 380.degree. C.; a crystallisation temperature less than 35.degree. C. and a viscosity less than 10 mPa.multidot.s in a range of temperature between 30-80.degree. C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.