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Preparation and use of iminodisuccinic acid ammonium metal salts

a technology iminodisuccinic acid, which is applied in the field of process for the preparation of ammonium metal salt of iminodisuccinic acid ammonium salt, can solve the problems of only partially or not at all biodegradabl

Inactive Publication Date: 2007-05-24
LANXESS DEUTDCHLAND GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention is about a process for making iminodisuccinic acid ammonium metal salts. The process involves mixing maleic anhydride, alkali metal hydroxide, and water, and then adding ammonia to obtain the iminodisuccinic acid ammonium salts. These salts can then be reacted with metal oxides, hydroxides, or other metal salts to obtain the final product. The technical effect of this invention is to provide a more efficient and effective process for making these important chemicals.

Problems solved by technology

However, many of the conventional complexing agents, such as EDTA and DTPA and various phosphonates and the metal complexes resulting therefrom, are not at all or only partially biodegradable; they remobilize heavy metals in surface waters and can even enter drinking water treatment, since they are not adsorbed in sewage sludges or soils.

Method used

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  • Preparation and use of iminodisuccinic acid ammonium metal salts
  • Preparation and use of iminodisuccinic acid ammonium metal salts

Examples

Experimental program
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Effect test

example 1

[0060] MA:NH3:H2O molar ratio=2:4:9, 90° C., 30 h

[0061] 1 782 g=99 mol of water are introduced and heated to 80° C. 2 157.3 g=22 mol of maleic anhydride are added at 80-100° C. with stirring and cooling. After the maleic anhydride has gone into solution, the mixture is stirred for a further 0.5 h approximately. Subsequently, 748 g=44 mol of ammonia are introduced at >90° C. After the introduction of ammonia has ended, the reaction mixture is stirred at 90° C. for more than 30 h, diluted with 1 312.7 g=72.93 mol of water and cooled to ambient temperature. After a clarifying filtration, which is optionally carried out, 6 000 g of product solution are obtained with the following yields: 80.0% of theory iminodisuccinic acid ammonium salt, 14.6% of theory aspartic acid ammonium salt, 2.5% of theory fumaric acid ammonium salt, 0.6% of theory malic acid ammonium salt and 0.4% of theory maleic acid ammonium salt. The solids content (=Σ ammonium salts) is 55 weight %. The clear light-yellow...

example 2

[0062] MA:NH3:H2O molar ratio=2:4:9, 90° C., 24 h

[0063] Implementation and amounts of this example correspond to those of Example 1. The reaction time is 24 h. The following yields are obtained: 77.9% of theory iminodisuccinic acid ammonium salt, 12.8% of theory aspartic acid ammonium salt, 3.0% of theory fumaric acid ammonium salt, 1.0% of theory malic acid ammonium salt and 3.4% of theory maleic acid ammonium salt.

example 3

[0064] MA:NH3:H2O molar ratio=2:4:9, 90° C., 36 h

[0065] Implementation and amounts of this example correspond to those of Example 1. The reaction time is 36 h. The following yields are obtained: 80.1% of theory iminodisuccinic acid ammonium salt, 15.0% of theory aspartic acid ammonium salt, 3.3% of theory fumaric acid ammonium salt, 1.1% of theory malic acid ammonium salt and 0.6% of theory maleic acid ammonium salt. The solids content (=Σ ammonium salts) is 55 weight %. The clear light-yellow solution has a density of 1.243 kg / litre and a pH of 7.03.

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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)n  Formula 8 in which IDA represents iminodisuccinic acid anion, x=0.1-3.9 y=0-3 z=0-3 m=0.1-2 n=0-6 and Me represents metals of the IInd, IIIrd and IVth main groups and of the Ist to VIIIth subgroups as well as metals of the lanthanide series, of the Periodic Table, which can occur in the oxidation states 1, 2, 3 or 4, the compounds themselves and their intermediates, and the use.

Description

CROSS REFERENCE TO RELATED APPLICATIONS [0001] The present application is a continuation application claiming benefit from copending U.S. patent application Ser. No. 10 / 423,326 having a filing date of Apr. 25, 2003 and entitled PREPARATION AND USE OF IMINODISUCCINIC ACID AMMONIUM METAL SALTS.BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] The invention relates to a process for the preparation of iminodisuccinic acid ammonium metal salts by reaction of maleic anhydride, alkali metal hydroxides, ammonia and water in a first stage to give iminodisuccinic acid ammonium salts and their subsequent reaction with metal oxides, metal hydroxides or other metal salts in a second stage. The products resulting therefrom can be used to increase the availability of metal ions, e.g. in agriculture, as trace element fertilizers or slug and snail pellets, or in the ceramics industry, for surface colouring. [0004] 2. Brief Description of the Prior Art [0005] Trace element fertilize...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C07C227/06A01M1/20A01N37/44C05D3/00C05D5/00C05D9/00C05D9/02C07C227/08C07C229/16C07C229/24C07C229/76C09K3/00
CPCA01N37/44C05D9/02C07C227/08C07C229/24C07C229/76C05F11/00
Inventor GROTH, TORSTENMITSCHKER, ALFREDMORITZ, RALF-JOHANNKLEIN, THOMASMENZEL, THOMASWIRTH, WOLFGANG
Owner LANXESS DEUTDCHLAND GMBH
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