Method for purifying (meth)acrylic acid

Details Method for purifying (meth)acrylic acid Method for purifying (meth)acrylic acid

2007-09-04

2007-09-04

Puttlitz, Karl (Department: 1621)

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acid esters

C562S600000, C159S006200

Reexamination Certificate

active

11103617

ABSTRACT:
A method for purifying a crude (meth)acrylic acid obtained by a vapor phase catalytic oxidation method, characterized in that the crude (meth)acrylic acid having most parts of water and acetic acid removed therefrom, is fed to and distilled in a first distillation column of a purification system comprising first to third three distillation columns, the top fraction from the first distillation column is fed to and distilled in the second distillation column, the resulting top fraction is recovered as a high purity (meth)acrylic acid product, the bottoms from the first and second distillation columns are fed to and distilled in the third distillation column, and the resulting top fraction is fed to the first distillation column.

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