Patent · US Active

Method for the production of aminodicarboxylic acid-N,N-diacetic acids

US8455682B2 · kind B2 · utility

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2References

18Claims

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Assignee

BASF SE

Inventors

Alfred Oftring · Bad Dürkheim, DE
Armin Stamm · Mainz, DE
Friedrich Wirsing · Speyer, DE
Gerold Braun · Ludwigshafen, DE

Key dates

Filing date	Mar 2, 2009
Grant date	Jun 4, 2013
Priority date	—
Expiry date	Jul 9, 2029

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C227/18
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

Provided is a method for the production of aminodicarboxylic acid N,N-diacetic acids of formula (I),wherein X is independently hydrogen or an alkali metal and n is 1 or 2. Aminodicarboxylic acid-N,N-diacetic acids of high purity can be yielded. The method involves: a) reacting an aminodicarboxylic acid, with 0.8 to 1.2 mole equivalents of formaldehyde and with 0.8 to 1.2 mole equivalents of hydrocyanic acid; b) reacting the reaction products of a) with 0.8 to 1.2 mole equivalents of hydrocyanic acid and with 0.8 to 1.2 mole equivalents of formaldehyde; c) hydrolyzing in the reaction product obtained in b).

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