METHOD FOR THE DEHYDRATION OF 3-HYDROXYPROPANOIC ACID TO FORM ACRYLIC ACID

摘要

The invention relates to a method for the dehydration of aqueous 3-hydroxypropanoic acid to form acrylic acid. Said 3-hydroxypropanoic acid is produced by fermentation, the 3-hydroxypropanoic acid is separated from the fermentation broth, the content of aldehydes in the aqueous 3-hydroxypropanoic acid is reduced to below 0.02 wt.%, the dehydration is carried out in the liquid phase and aqueous acrylic acid is continually stripped from the liquid phase.