PROCESS FOR PRODUCING (METH) ACROLEIN OR (METH) ACRYLIC ACID

摘要

A process for producing (meth) acrolein or (meth) acrylic acid which comprises feeding a starting material for (meth) acrolein or (meth) acrylic acid to an oxidation reactor together with a molecular-oxygen-containing gas which has been mixed with a diluent gas and compressed with a compressor to conduct a catalytic vapor-phase oxidation, feeding the gas resulting from the reaction to an absorption column to bring it into contact with water, recovering an aqueous solution of (meth) acrolein or (meth) acrylic acid through the bottom of the absorption column, and using as the diluent gas all or part of the discharge gas recovered through the top of the absorption column, wherein the temperature of the mixed gas at the intake of the compressor is regulated so as to be higher than the dew point of the gas. Thus, the compressor can be prevented from being clogged or damaged.