Method for the continuous extraction of (meth)acrylic acid

Details Method for the continuous extraction of (meth)acrylic acid Method for the continuous extraction of (meth)acrylic acid

2006-09-19

2006-09-19

Richter, Johann (Department: 1621)

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

Organic compounds

Carboxylic acids and salts thereof

C562S532000

Reexamination Certificate

active

07109374

ABSTRACT:
A process for the continuous recovery of (meth)acrylic acid from the reaction gas of a catalytic gas-phase oxidation comprising the following process stages is proposed:I quenching of the reaction gas by evaporative cooling using a high-boiling solvent,II separation of the (meth)acrylic acid from the quenched reaction gas by absorption into the high-boiling solvent,III separation of the solvent laden with (meth)acrylic acid by rectification into a first part-stream IIIA), which contains predominantly (meth)acrylic acid, and into a second part-stream IIIB) which contains predominantly the solvent,IV recycling of the stream IIIB) to process stage II andV distillative production of (meth)acrylic acid from stream IIIA), all liquid residual streams obtained in process stage V being recycled to process stage I.

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