Patent · US Expired

Preparation of N-acylamino carboxylic acids and N-acylamino sulfonic acids and their alkali metal salts

US5856538A · kind A · utility

11Cited by

3References

8Claims

0Family size

Assignee

BASF SE

Inventors

Beate Strecker · Ludwigshafen, DE
Alfred Oftring · Bad Dürkheim, DE
Dieter Hertel · Leimen, DE
Georg Schuh · Ludwigshafen, DE

Key dates

Filing date	Mar 24, 1997
Grant date	Jan 5, 1999
Priority date	—
Expiry date	Mar 24, 2017

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C303/32
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

N-acylamino carboxylic acids and N-acylamino sulfonic acids and their alkali metal salts from the technical alkali metal salts of amino carboxylic acids and amino sulfonic acids, respectively, with an active content of 50-95% by weight, based on the solids content of the technical alkali metal salts, and from alkyl carboxylates, are prepared by PA1 (a) preparing a suspension of the solid anhydrous technical alkali metal salts of the amino carboxylic acids or amino sulfonic acids in the alkyl carboxylates, PA1 (b) reacting this suspension by adding more than 30 to 150 mol % of strong bases to give the alkali metal salts of the N-acylamino carboxylic acids or N-acylamino sulfonic acids, and PA1 (c) if required preparing therefrom the free N-acylamino carboxylic acids or N-acylamino sulfonic acids in a conventional way by adding acids.

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