Patent ID: 7109374
Filing Date: 2006-09-19
Classification: B01D,C07C

Abstract:
1. A process for the continuous production of (meth)acrylic acid from the reaction gas of a catalytic gas-phase oxidation producing (meth)acrylic acid, comprising the following process stages: 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 to produce a high boiling solvent laden with (meth)acrylic acid, followed by as the next succeeding separation stage, III separation of the high boiling solvent laden with (meth)acrylic acid into a first part-stream (IIIA) in vapor form, which contains predominantly (meth)acrylic acid, and into a liquid second part-stream (IIIB) which contains predominantly the high-boiling solvent, IV recycling of the stream (IIIB) to process stage II and V distillative production of (meth)acrylic acid from stream (IIIA), wherein all liquid residual streams obtained in process stage V are recycled to process stage I, wherein process stage III is carried out by rectification.