| 摘要 |
For use in a process for the production of (meth)acrylic acid comprising at least a step for the reaction of (meth)acrylic acid by catalytic gas phase oxidation and a step for the absorption thereof, a method for preventing an effluent gas pipe from blocking is disclosed, which method is characterized by causing part or the whole of the gas discharged from the step for absorption, while being circulated via the effluent gas pipe to the step for the reaction or being discarded, to be subjected to temperature elevation and application of pressure and/or mist separation. Particularly by setting the temperature of the waste gas from the absorption column at a level in the range of 30-70° C., it is made possible to decrease the contents of water, low boiling substances, and subliming substances entrained by the waste gas and, coupled with the temperature elevation and the application of pressure implemented in the effluent gas pipe, attain effective prevention of the interior of the effluent gas pipe from blockage and corrosion.
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