Manufacture of methacrylic acid
AssigneeMitsubishi Chemical Industries Limited
InventorsTakeru Onoda, Masayuki Otake
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Abstract
Methacrylic acid is manufactured by oxidative dehydrogenation of isobutyric acid in vapor phase in the presence of a supported catalyst containing a heteropolyacid and/or a reduced form of the heteropolyacid. A highly siliceous material having a high water absorbability is used as a carrier for the catalyst to improve the conversion rate and selectivity as well as the catalyst durability.
Claims6
In a process for the manufacture of methacrylic acid which comprises reacting oxygen and isobutyric acid in vapor phase in the presence of a supported catalyst containing a heteropolyacid having the general formula:
- H.sub.3+x Mo.sub.12-x-y W.sub.y V.sub.x PO.sub.40
- wherein x and y are independently 0, 1, 2 or 3 and x + y <
- 5, and/or a reduced form of said heteropolyacid, the improvement wherein the carrier for said catalyst has a SiO.sub.2 content of at least 70% and a water absorbability of at least 60%.
Dependencies are inferred from the claim text.