Patent · US Expired

Method for producing (meth)acrylic acid

US6395140B1 · kind B1 · utility

5Cited by

7References

9Claims

0Family size

Assignee

BASF SE

Inventors

Holger Herbst · Bischofswerda, DE
Gerhard Nestler · Ludwigshafen, DE
Ulrich Hammon · Mannheim, DE

Key dates

Filing date	Apr 24, 2000
Grant date	May 28, 2002
Priority date	—
Expiry date	Apr 24, 2020

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S203/20
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

In a process for the preparation of (meth)acrylic acid from a mixture which contains (meth)acrylic acid and a solvent having a boiling point above the boiling point of (meth)acrylic acid by distillation of the mixture in a column which is connected to an evaporator and has a stripping section and a rectifying section, between which the mixture is fed in, and a side take-off for the (meth)acrylic acid, a polymeization inhibitor is fed into the column in the region of the top of the column and in the region of the side take-off, that amount of polymerization inhibitor which is introduced in the region of the top of the column being smaller than the amount introduced in the region of the side take-off.

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