PROCESS FOR PRODUCING (METH)ACRYLIC ACID

摘要

A process in which (meth)acrylic acid is inhibited from undesirably undergoing polymerization in a purification step for (meth)acrylic acid production to thereby avoid troubles such as clogging in apparatuses and attain a stable continuous operation. The process for (meth)acrylic acid production comprises distilling a liquid comprising (meth)acrylic acid and water in a distillation column in the presence of an entrainer forming an azeotropic mixture at least with water to thereby remove the water from the water-containing liquid (meth)acrylic acid by azeotropy with the entrainer, wherein after distillation with the entrainer in the distillation column, the water-containing liquid (meth)acrylic acid is distilled in the presence of the entrainer.