Catalytic gas-phase oxidation of methacrolein to methacrylic aci

Details Catalytic gas-phase oxidation of methacrolein to methacrylic aci Catalytic gas-phase oxidation of methacrolein to methacrylic aci

1992-09-22

1993-07-27

Prescott, Arthur C.

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

Organic compounds

Carboxylic acids and salts thereof

562532, 562535, C07C 5125

Patent

active

052312267

ABSTRACT:
A process for the catalytic gas-phase oxidation of methacrolein to methacrylic acid in a fixed-bed reactor with contacting tubes, at elevated temperature on catalytically active oxides with a conversion of methacrolein for a single pass of from 40 to 95 mol%, wherein the reaction temperature in the flow direction along the contacting tubes in a first reaction zone from entry of the starting reaction gases containing the reactants into the contacting tubes is from 280 to 340.degree. C. until a methacrolein conversion of from 20 to 40% is reached, and the reaction temperature is subsequently reduced by a total of from 5.degree. to 40.degree. C., abruptly or successively in steps or continuously along the contacting tubes until a methacrolein conversion of from 45 to 95% has been reached, with the proviso that the reaction temperature in this second reaction zone is not lower than 260.degree. C.

REFERENCES:
patent: 4564703 (1986-01-01), Yamamoto et al.
patent: 4618709 (1986-10-01), Sada et al.
patent: 4873368 (1989-10-01), Kadowaki et al.
patent: 4925981 (1990-05-01), Shimizu et al.
patent: 5155262 (1992-10-01), Etzkorn et al.

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