METHOD FOR PRODUCING ACRYLIC ACID

PROBLEM TO BE SOLVED: To provide a method for producing acrylic acid, which controls formation of a polymer during storage of acrylic acid in a storage tank in a process for producing acrylic acid, especially a method for producing acrylic acid, which has a few problems of reduction in purity of acrylic acid in spite of being acrylic acid passed through a purification process such as distillation, crystallization, etc. SOLUTION: The method for producing acrylic acid comprises carrying out a filtration operation at 15-70°C at least once when a process liquid containing ≥50% by mass of acrylic acid is supplied to a storage tank. The production method is carried out for acrylic acid obtained by purification by a distillation and/or crystallization process of acrylic acid obtained as a bottom stream and/or side stream especially of a collection column, condensation column and/or distillation column. COPYRIGHT: (C)2007,JPO&INPIT