PROCESS FOR PRODUCING CARBOXYLIC ACID

摘要

Before a crystallization step in which a carboxylic acid is crystallized from a carboxylic-acid-containing liquid in crystallization tanks (12) and (13) each having a cooling surface, a preliminary step is conducted in which at least part of the carboxylic-acid-containing liquid is fed to a cooling device (11) equipped with cooling surfaces (15) and (16) and scraping means (18) and (19) for scraping the cooling surfaces and is cooled from a temperature exceeding the crystallization initiation temperature to a temperature not higher than the crystallization initiation temperature. This process is preferable especially when the carboxylic acid is acrylic acid and/or methacrylic acid.