Process for producing methacrylic acid
US4745217A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 26, 1983 |
| Grant date | May 17, 1988 |
| Priority date | — |
| Expiry date | May 26, 2003 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J2523/00
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A catalyst having a heteropoly-acid structure and the general formula: EQU Mo.sub.a V.sub.b P.sub.c Cu.sub.d X.sub.e O.sub.f wherein Mo, V, P, Cu and O represent respectively molybdenum, vanadium, phosphorus, copper and oxygen, X represents one or more elements selected from the group consisting of tin, thorium, germanium, nickel, iron, cobalt, magnesium, zinc, titanium, lead, rhenium, zirconium, and chromium, and a, b, c, d, e and f represent the atomic ratio of the elements where, PA0 a is 10 PA0 b is a number of 3 or less than 3 excluding 0, PA0 c is a number of 0.5 to 3, PA0 d is a number of 3 or less than 3 excluding 0, PA0 e is a number of 3 or less than 3 excluding 0, PA0 f is a number determined depending on the valency and atomic ratio of other elements. There is also provided a process for producing methacrylic acid by oxidizing methacrolein with molecular oxygen or molecular oxygen-containing gas in the presence of the catalyst defined above.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.