Method for producing methacrylic acid

Details Method for producing methacrylic acid Method for producing methacrylic acid

2007-12-04

2007-12-04

Eyler, Yvonne (Department: 1621)

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

Organic compounds

Carboxylic acids and salts thereof

C562S533000, C562S534000, C562S535000

Reexamination Certificate

active

10569371

ABSTRACT:
The present invention provides a method for producing methacrylic acid through gas-phase catalytic oxidation of methacrolein or a methacrolein-containing gas with molecular oxygen or a gas containing molecular oxygen by the use of a fixed-bed multitubular reactor comprising a plurality of reaction tubes each having a catalyst layer therein, wherein the above catalyst layer is divided in the direction of the tube axis of a reaction tube into two or more layers, to thereby provide a plurality of reaction zones, and the catalyst is caused to be present in the catalyst layer in such a way that a reaction load ratio CRc(i) per unit mass of the catalyst in each reaction zone becomes 0.8 to 1.0.

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patent: 03/057653 (2003-07-01), None

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