Purification of a distilled bottom product containing (meth) acrylic acid by means of a crystallization process

Purification of a distilled bottom product containing (meth) acrylic acid by means of a crystallization process

The invention relates to a method for producing (meth)acrylic acid, in which: a) a (meth)acrylic acid-containing product gas obtained by gas phase oxidation is contacted with an aqueous phase in a quenching unit (3) so as to obtain an aqueous quenched phase, b) the quenched phase is distilled in a d...

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1. Verfasser: NORDHOFF STEFAN,RATHKE THOMAS,BALDUF TORSTEN,KOBUS AXEL,THONG YUIANG DENNIS,LEISTNER JOERG
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ACYCLIC OR CARBOCYCLIC COMPOUNDS
CHEMISTRY
METALLURGY
ORGANIC CHEMISTRY
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description The invention relates to a method for producing (meth)acrylic acid, in which: a) a (meth)acrylic acid-containing product gas obtained by gas phase oxidation is contacted with an aqueous phase in a quenching unit (3) so as to obtain an aqueous quenched phase, b) the quenched phase is distilled in a distillation unit (5) so as to obtain a bottom product and a top product, c ) at least the bottom product is crystallized in a crystallization unit so as to obtain pure (meth)acrylic acid, an organic separating agent being added downstream of the quenching unit (3) and preferably no later than in the crystallization unit. The invention also relates to a device for producing (meth)acrylic acid, a method for producing a polymer from a (meth)acrylic acid obtained according to the inventive method, a device for producing said polymer, a polymer obtained according to said method, and the use of the (meth)acrylic acid or the polymer in chemical products such as fibers or molded members.
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The invention also relates to a device for producing (meth)acrylic acid, a method for producing a polymer from a (meth)acrylic acid obtained according to the inventive method, a device for producing said polymer, a polymer obtained according to said method, and the use of the (meth)acrylic acid or the polymer in chemical products such as fibers or molded members.</abstract><oa>free_for_read</oa></addata></record>
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subjects ACYCLIC OR CARBOCYCLIC COMPOUNDS
CHEMISTRY
METALLURGY
ORGANIC CHEMISTRY
title Purification of a distilled bottom product containing (meth) acrylic acid by means of a crystallization process
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