Catalytic gas-phase oxidation of acrolein to acrylic acid

Details Catalytic gas-phase oxidation of acrolein to acrylic acid Catalytic gas-phase oxidation of acrolein to acrylic acid

1992-09-17

1993-11-23

Prescott, Arthur C.

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

Organic compounds

Carboxylic acids and salts thereof

562534, 562535, 562536, 562544, 562546, 562548, 562600, C07C 5125, C07C 5704, C07C 57055

Patent

active

052646254

ABSTRACT:
A process for the catalytic gas-phase oxidation of acrolein to acrylic acid in a fixed-bed reactor with contacting tubes, at elevated temperature on catalytically active oxides with a conversion of acrolein for a single pass of .gtoreq.95%, wherein the reaction temperature in the flow direction along the contacting tubes in a first reaction zone before the starting reaction gases containing the reactants enter the contacting tubes is from 260.degree. to 300.degree. C. until an acrolein 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 .gtoreq.95% has been reached, with the proviso that the reaction temperature in this secondary reaction zone is not lower than 240.degree. C.

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