Patent · US Expired

Process for the preparation of glycine-N, N-diacetic acid derivatives

US5817864A · kind A · utility

7Cited by

2References

6Claims

0Family size

Assignee

BASF SE

Inventors

Thomas Greindl · Bad Dürkheim, DE
Alfred Oftring · Bad Dürkheim, DE
Gerold Braun · Ludwigshafen, DE
Jochen Wild · Ruppertsberg, DE
Birgit Potthoff-Karl · Weinheim, DE
Georg Schuh · Ludwigshafen, DE

Key dates

Filing date	May 24, 1996
Grant date	Oct 6, 1998
Priority date	—
Expiry date	May 24, 2016

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C227/26
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

Glycine-N, N-diacetic acid derivatives are prepared by reacting corresponding 2-substituted glycines, 2-substituted glycinonitriles, doubled glycines, or precursors of the glycine derivatives with formaldehyde and alkali metal cyanide. The reaction is conducted in an aqueous medium at a pH of 8 to 14. From 0, 5 to 30% of the amount of alkali metal cyanide required for the reaction are added to the glycine derivatives or precursors thereof Subsequently, the remaining amount of alkali metal cyanide and the formaldehyde are simultaneously metered in over a period of from 0.5 to 12 hours.

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