Processes for preparing acrylic acid and for preparing an acrylate or a mixture of two or more of the same, and, using oligomeric acrylic acid or a mixture of acrylic acid and oligomeric acrylic acid

摘要

"PROCESSES FOR PREPARING ACRYLIC ACID AND FOR PREPARING AN ACRYLATE OR A MIXTURE OF TWO OR MORE OF THE SAME, AND, USE OF ACRYLIC ACID ACRYLIC ACID OR A MIXTURE OF ACRYLIC ACID AND ACRYLIC ACID ACRYLIC" Process to prepare acrylic acid and / / acrylic comprises step A, and, if desired, B and C: A: cooling a gas reaction mixture comprising acrylic acid and which is obtained by oxidizing the gas phase to prepare acrylic acid, using oligomeric acrylic acid or a mixture of acid acrylic and oligomeric acrylic acid, resulting in a gas mixture comprising acrylic acid and a blast cooling product that comprises oligomeric acrylic acid. B: separation of the gas mixture comprising acrylic acid, resulting in a low boiling fraction, a crude acrylic acid, and a bottom product, which comprises oligomeric acrylic acid. C: esterification of the crude acrylic acid obtained in step B by means of one or more alkanols.