Title:
PROCESS FOR THE PREPARATION OF A MIXTURE OF CHELATING AGENTS
Document Type and Number:
WIPO Patent Application WO/2011/151517
Kind Code:
A3
Abstract:
The present invention relates to a process for the preparation of a mixture of aspartic acid diethoxy succinate and an amino acid derivative of the general formula (I) wherein n is 1-10, m is 0 or 1, and R is hydrogen or an alkali metal or alkaline earth metal ion, comprising reacting maleate with diethanol amine under alkaline conditions in the presence of a lanthanoid catalyst to form aspartic acid diethoxy succinate followed by adding aspartic acid which reacts with unreacted maleate to form imino disuccinic acid, i.e. an amino acid derivative of formula (I) wherein m is 0, or by adding a diamine derivative of the general formula (II) NH2(CH2)nNH2 wherein n is as defined above, which reacts with unreacted maleate to form an amino acid derivative of formula (I) wherein m is 1 and n is as defined above.
Inventors:
AKSELA REIJO (FI)
RISSANEN JUSSI (FI)
RISSANEN JUSSI (FI)
Application Number:
PCT/FI2011/050504
Publication Date:
March 22, 2012
Filing Date:
May 31, 2011
Export Citation:
Assignee:
KEMIRA OYJ (FI)
AKSELA REIJO (FI)
RISSANEN JUSSI (FI)
AKSELA REIJO (FI)
RISSANEN JUSSI (FI)
International Classes:
C07C227/10; C07C227/06; C07C227/16; C07C229/24
Domestic Patent References:
| WO1997045396A1 | 1997-12-04 | |||
| WO1999046234A1 | 1999-09-16 | |||
| WO1997045585A1 | 1997-12-04 |
Foreign References:
| EP1086944A2 | 2001-03-28 |
Attorney, Agent or Firm:
BERGGREN OY AB (P.O. Box 16, Helsinki, FI)
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