Patent · US Expired

Preparation and use of iminodisuccinic acid ammonium metal salts

US7183429B2 · kind B2 · utility

1Cited by

1References

4Claims

0Family size

Assignee

LANXESS Deutschland GmbH · DE

Inventors

Torsten Groth · Reinbek, DE
Alfred Mitschker · Odenthal, DE
Ralf-Johann Moritz · Neuss, DE
Thomas Klein · Saratoga, US
Thomas Menzel · Pfeffingen, CH
Wolfgang Wirth · Bensberg, DE

Key dates

Filing date	Apr 25, 2003
Grant date	Feb 27, 2007
Priority date	—
Expiry date	Apr 11, 2025

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C229/24
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

The invention relates to a process for the preparation of iminodisuccinic acid ammonium metal salts, characterized in that, in a first stage, maleic anhydride (MA), alkali metal hydroxide and water are mixed in the molar ratio of 2:0–3:5–30 and then ammonia is metered in in the ratio MA: ammonia 2:1.5–8, in order to obtain iminodisuccinic acid ammonium salts which, in a second stage, are reacted with metal oxides, metal hydroxides (and) or other metal salts or their mixtures to give iminodisuccinic acid ammonium metal salts of the formula 8,IDA(NH4)x(Na)y(K)z(Me)m.(NH3)nFormula 8in which

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