Reaction tube, process for producing catalyst and process...

Details Reaction tube, process for producing catalyst and process... Reaction tube, process for producing catalyst and process...

2005-07-19

2005-07-19

Nguyen, Cam N. (Department: 1754)

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

Organic compounds

Carboxylic acids and salts thereof

C562S537000, C562S538000, C562S542000, C562S546000, C502S311000, C502S316000, C422S312000

Reexamination Certificate

active

06919478

ABSTRACT:
In producing a catalyst used for synthesis of an unsaturated aldehyde and an unsaturated carboxylic acid by a gas-phase catalytic oxidation, there is used a step of packing an additive-containing catalyst precursor of the catalyst into a tubular reactor, passing a gas through the tubular reactor, and elevating, in this state, the temperature of the additive-containing catalyst precursor so that a temperature of the gas at an outlet of the catalyst precursor layer becomes higher than a temperature of the gas at an inlet of the catalyst precursor layer. The step makes possible easy and highly reproducible production of a high-performance catalyst which is small in the reduction in catalytic performance caused by, for example, the thermal decomposition of the additive contained in the catalyst precursor.

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