Process for preparing acrylic or methacrylic acid

Details Process for preparing acrylic or methacrylic acid Process for preparing acrylic or methacrylic acid

1983-10-18

1985-06-04

Torrence, Dolph H.

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

Organic compounds

Carboxylic acids and salts thereof

502308, 502309, 502310, 502312, 427213, 427215, C07C 5132

Patent

active

045216185

ABSTRACT:
A process is disclosed for preparing coated catalysts, inter alia, for gas phase oxidations in organic chemistry, comprised of an inert support and a coating of catalyst material enclosing this support, wherein a suspension of the starting material for the coating is sprayed onto an agitated bed of the support, while the suspending medium is being partially removed by a gas stream, and the raw material is then dried and heat-treated. For this purpose, the support bed is mechanically agitated and loosened by a gas stream blown in from below. The catalyst precursor containing a binder and, if appropriate, a pore-former is sprayed in an increasing amount from above onto the bed, the ratio between suspending medium sprayed on and drawn off remaining about constant. The thermal expansion coefficient of the precursor as a dry powder must not deviate by more than 15% from that of the support. The applied coating is densified by continuing the mechanical and fluidizing mixing motion, the material is then dried in a continuing gas stream and heat-treated, if appropriate after decomposition of an added pore-former.

REFERENCES:
patent: 3773692 (1973-11-01), Hensel et al.
patent: 4297247 (1981-10-01), Krabetz et al.
patent: 4305843 (1981-12-01), Krabetz et al.

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