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1. (WO2016050582) METHOD AND SYSTEM FOR RECOVERING ACRYLIC ACID

Pub. No.:    WO/2016/050582    International Application No.:    PCT/EP2015/071851
Publication Date: Fri Apr 08 01:59:59 CEST 2016 International Filing Date: Thu Sep 24 01:59:59 CEST 2015
IPC: C07C 51/42
C07C 51/44
C07C 57/04
Applicants: BASF SE
Inventors: HAMMON, Ulrich
WALTER, Thomas
OTTENBACHER, Markus
HÜTTEN, Frank
Title: METHOD AND SYSTEM FOR RECOVERING ACRYLIC ACID
Abstract:
The invention relates to a method for recovering acrylic acid, having the following steps a) separating a temperature-controlled mother acid stream from a crystallization device in the direction of an absorption column (201) and in the direction of a splitting column (205), b) supplying the first temperature-controlled mother acid sub-stream as a return flow to the top plate of the splitting column (205), c) supplying at least one strip gas stream below the bottom plate of the splitting column (205), d) supplying an auxiliary component stream, which comprises an oligomeric acrylic acid, from the condensation column (201) to a central base of the splitting column (205), e) splitting at least one part of the oligomeric acrylic acid from the auxiliary component stream in the splitting column (205), thereby obtaining monomeric acrylic acid, f) separating the auxiliary components contained in the auxiliary component stream by means of a counter-current rectification process in the splitting column (205), g) discharging the monomeric acrylic acid without condensation as a gas mixture together with the supplied strip circuit gas stream at the head of the splitting column (205), and h) supplying the gas mixture below the bottom plate of the condensation column (201). The invention further relates to a system (1) for recovering acrylic acid.