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US 2025/0010276 A1Published application
Catalyst for methacrylic acid production, method for producing same, and method for producing methacrylic acid and methacrylic acid esters using catalyst
AssigneeMitsubishi Chemical Corporation
InventorsShogo HAYAKAWA, Jun HIRATA, Mitsuru KANNO, Wataru NINOMIYA
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Abstract
An object is to provide a catalyst which has high heat resistance and which can allow for production of methacrylic acid at a high yield, and to provide methods for producing methacrylic acid and methacrylic acid ester with the catalyst, and the object is achieved by use of a catalyst having a specified 31P-NMR spectrum.
Claims14
A catalyst for methacrylic acid production by oxidation of methacrolein, wherein
- the catalyst contains heteropoly acid including phosphorus, molybdenum and tungsten, and
- C/(A+B+C) is 0.015 to 0.085 when the area of a signal observed in a range of −5.2 ppm or more and less than 0 ppm is defined as A, the area of a signal observed in a range of −10 ppm or more and less than −5.2 ppm is defined as B, and the area of a signal observed in a range of −20 ppm or more and less than −10 ppm is defined as C in a 31P-NMR spectrum of the catalyst.
Dependencies are inferred from the claim text.