Method for purifying acrylic acid

摘要

The objective of the present invention is to provide methods of efficiently purifying and producing acrylic acid by removing solid acrylic acid polymers dissolving and existing in crude acrylic acid supplied to purifying process. The purifying method of the present invention comprises: filtrating the crude acrylic acid to obtain a filtrate at temperature from 15 to 70°C and at liquid linear velocity of 5 m/s or less, wherein the crude acrylic acid contains an acrylic acid of 50% by mass or more; and purifying the acrylic acid from the filtrate. The producing method of the present invention comprises carrying out the purifying method.