Patent · US Active

Process for making mixtures of chelating agents

US10519097B2 · kind B2 · utility

0Cited by

8References

13Claims

0Family size

Assignee

BASF SE

Inventors

Armin Stamm · Mainz, DE
Thomas Schmidt · Neustadt, DE
Christopher Henry Orr · Kirkbymoorside, GB
Jeremy T Manning · Ypsilanti, US

Key dates

Filing date	May 3, 2016
Grant date	Dec 31, 2019
Priority date	—
Expiry date	May 3, 2036

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC11D2111/14
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

Process for making a chelating agent according to the general formula (I), R1—CH(COOX1)—N(CH2COOX1)2 wherein R1 is selected from hydrogen, C1-C4-alkyl, phenyl, benzyl, CH2OH, and CH2CH2COOX1, X1 is (MχH1−χ), M being selected from alkali metal, x is in the range of from 0.6 to 1, said process comprising the following steps: (a) providing a solid, a slurry or a solution of a compound according to general formula (II a) R1—CH(COOX2)—N(CH2CN)2 wherein X2 is (MyH1−y), M being selected from alkali metal, y is in the range of from zero to 1, (b) contacting said solid or slurry or solution with an aqueous solution of alkali metal hydroxide, wherein the molar ratio of alkali metal ions to nitrile groups is in the range of from 0.6:1 to 0.95:1, (c) reacting said compound according to general formula (II a) with said alkali metal hydroxide.

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