Patent · US Expired

Process for eliminating 1-carboxy-1-phosphonocyclopentan-3-one from, or reducing its content in, technical 2-phosphonobutane-1,2,4-tricarboxylic acid using bleaching liquor

US5091562A · kind A · utility

2Cited by

5References

5Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Michael Immenkeppel · Bonn, DE
Roland Kleinstuck · Bensberg, DE
Hans-Dieter Block · Cologne, DE
Hermann Sicius · Düsseldorf, DE
Peter C. Schmidt · Leverkusen, DE

Key dates

Filing date	Mar 27, 1991
Grant date	Feb 25, 1992
Priority date	—
Expiry date	Mar 27, 2011

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07F9/3808
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

The present invention relates to a process for eliminating 1-phosphono-1-carboxycyclopentan-3-one (ketone) from, or reducing its content in, an aqueous solution of 2-phosphonobutane-1,2,4-tricarboxylic acid, characterized in that the solution is adjusted to a pH value of > 6 using an aqueous inorganic base, particularly sodium hydroxide, and aqueous bleaching liquor is subsequently added in a molar ratio of NaOCl to ketone of >5:1.

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