Patent · US Expired

Method for producing acrylic acid and acrylic acid esters

US6727383B1 · kind B1 · utility

7Cited by

3References

13Claims

0Family size

Assignee

BASF SE

Inventors

Gerhard Nestler · Ludwigshafen, DE
Jürgen Schröder · Ludwigshafen, DE
Otto Machhammer · Mannheim, DE

Key dates

Filing date	Oct 2, 2000
Grant date	Apr 27, 2004
Priority date	—
Expiry date	Oct 2, 2020

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C67/08
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

A process for preparing acrylic acid and/or acrylates which comprises the following stage A and, if desired, B and C:A: cooling a gaseous reaction mixture which comprises acrylic acid and is obtained in the gas-phase oxidation to prepare acrylic acid, using oligomeric acrylic acid or a mixture of acrylic acid and oligomeric acrylic acid, to give a gaseous mixture comprising acrylic acid and a quench bottom product which comprises oligomeric acrylic acid;B: separating the gaseous mixture comprising acrylic acid, to give a low-boiling fraction, a crude acrylic acid, and a bottom product, which comprises oligomeric acrylic acid;C: esterifying the crude acrylic acid obtained in stage B by means of one or more alkanols.

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