Process for producing methacrylic acid

Details Process for producing methacrylic acid Process for producing methacrylic acid

2005-08-16

2005-08-16

Richter, Johann (Department: 1621)

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acids and salts thereof

C562S531000, C562S532000, C562S598000

Reexamination Certificate

active

06930201

ABSTRACT:
In a method of producing methacrylic acid by passing a material gas containing methacrolein, oxygen and water vapor through a reactor packed with a catalyst containing as the main component a compound oxide containing molybdenum and phosphorus, a concentration of methacrolein in the material gas is controlled in a range of 4 to 6.5 vol %, a molar ratio of the water vapor to the methacrolein in the material gas is controlled in a range of 1 to 2, and a space velocity of the material gas to the catalyst-packed layer is controlled in a range of 500 to 750 h−1, whereby deterioration of the catalyst is effectively inhibited.

REFERENCES:
patent: 0005769 (1979-05-01), None
patent: 1473035 (1977-05-01), None
patent: 49-109316 (1974-10-01), None
patent: 6-91172 (1994-04-01), None
patent: 9-75740 (1997-03-01), None

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