Process for the production of acrylic acid or methacrylic acid
US4677225A · kind A · utility
17Cited by
7References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 21, 1985 |
| Grant date | Jun 30, 1987 |
| Priority date | — |
| Expiry date | May 21, 2005 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C51/353
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A process for producing acrylic acid or methacrylic acid by reacting acetic acid or propionic acid with formaldehyde in a gas phase is described, characterized by carrying out the reaction in the presence of a solid catalyst containing at least one of boron oxide or phosphorus oxide and having an acid site of an acid strength, pKa.ltoreq.-3.0. The solid catalyst is of high activity and is satisfactory in both selectivity and conversion and, furthermore, its high selectivity can be maintained for long periods of time. Thus the desired product, acrylic acid or methacrylic acid, can be produced in high yield.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.