Stabilization and transport of .alpha.,.beta.-unsaturated carboxylic acid and removal of stabilizer
US6046357A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 2, 1998 |
| Grant date | Apr 4, 2000 |
| Priority date | — |
| Expiry date | Oct 2, 2018 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C51/50
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process for inhibiting free-radical polymerization of an alpha,beta-unsaturated (.alpha.,.beta.-unsaturated) carboxylic acid, and for providing desired grade .alpha.,.beta.-unsaturated carboxylic acid for use following storage and transport is described herein. In particular, bulk storage and shipment such as with overseas transport is described. The process comprises combining the .alpha.,.beta.-unsaturated carboxylic acid with a phenolic inhibitor and a coinhibitor to form an inhibited mixture, storing the inhibited mixture, transporting the inhibited mixture, and removing the coinhibitor to provide the desired grade .alpha.,.beta.-unsaturated carboxylic acid for use. In preferred embodiments, the .alpha.,.beta.-unsaturated carboxylic acid is acrylic acid, the phenolic inhibitor is .rho.-methoxyphenol, the coinhibitor is manganese cation, and removal of the coinhibitor is carried out using an ion exchange resin.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.