Patent · US Active

Process for production of (meth)acrylic acid with high boiling fraction work-up by means of crystallization

US8178717B2 · kind B2 · utility

5Cited by

6References

11Claims

0Family size

Assignee

Evonik Stockhausen GmbH · US

Inventors

Torsten Balduf · Pfungstadt, DE
Gunther Bub · Marl, DE
Jurgen Mosler · Marl, DE
Andreas Sabbagh · Dülmen, DE
Jurgen Kohn · Rheinberg, DE
Arndt Selbach · Dirmstein, DE

Key dates

Filing date	Aug 11, 2006
Grant date	May 15, 2012
Priority date	—
Expiry date	Jan 13, 2028

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C51/43
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

A process for production of (meth)acrylic acid is disclosed. The process includes synthesizing and distillatively working-up a crude (meth)acrylic acid phase to obtain a (meth)acrylic acid phase and a dimer phase including (meth)acrylic acid dimers and/or (meth)acrylic acid oligomers. At least a part of the (meth)acrylic acid dimers and/or of the (meth)acrylic acid oligomers from the dimer phase is split to obtain a (meth)acrylic acid including a low-boiling phase and a high-boiling phase including less (meth)acrylic acid than the low-boiling phase. At least a part of the (meth)acrylic acid from the low-boiling phase is separated by forming of one or more crystals to obtain a pure (meth)acrylic acid and a residue. Also disclosed is a device for production of (meth)acrylic acid, a process for production of a polymer as well as chemical products based on or including (meth)acrylic acid or a polymer as well as the use of (meth)acrylic acid or polymers in chemical products.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.