Process for separating by rectification a liquid which contains an acrylic acid and/or methacrylic acid

摘要

Rectifying separation of a liquid II containing at least 10 wt.% of acrylic acid and/or methacrylic acid and not more than 5 wt.% of acrolein and/or methacrolein and acetone (where the difference in weight ratio of acrolein to acetone is 3.5, that is produced without adding another acrylic acid and/or methacrylic acid as a pure substance containing fluid I (acrolein or methacrolein)) comprises providing the liquid II containing 10 wt.% of acetone, based on total quantity of liquid II containing acrolein and methacrolein, to a rectification column.