Patent · US Active

Method for inhibiting unwanted radical polymerisation of acrylic acid present in a liquid phase P

US11447439B2 · kind B2 · utility

0Cited by

15References

12Claims

0Family size

Assignee

BASF SE

Inventors

Nicole Janssen · Bermersheim, DE
Peter Zurowski · Landau, DE
Ulrich Hammon · Mannheim, DE
Sylke Haremza · Neckargemünd, DE

Key dates

Filing date	Jul 16, 2019
Grant date	Sep 20, 2022
Priority date	—
Expiry date	Jul 16, 2039

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C51/44
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

Process for inhibiting the undesired free-radical polymerization of acrylic acid present in a liquid phase P, wherein the acrylic acid content of P is at least 10% by weight, the liquid phase P comprises in the range from 25 to 1000 ppmw of glyoxal based on the weight of the acrylic acid present in P and the liquid phase P is admixed with furfural in an amount that results in a furfural content in the range from 25 to 1000 ppmw based on the weight of the acrylic acid present in P. Liquid phase P, wherein the acrylic acid content of P is at least 10% by weight and the liquid phase P comprises in the range from 25 to 1000 ppmw of glyoxal and in the range from 25 to 1000 ppmw of furfural in each case based on the weight of the acrylic acid present in P.

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