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Preparation method of imino disuccinate chelator

A technology of iminodisuccinate and chelating agent, which is applied in the preparation of organic compounds, chemical instruments and methods, and cyanide reaction preparation, can solve the problems that cannot meet the requirements of industrialization promotion, and achieve short reaction time and high reaction time. Mild conditions and high reaction yield

Inactive Publication Date: 2015-03-25
HEBEI XIETONG ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the article confirms that iminodisuccinate can be prepared by using aspartic acid and maleic acid as raw materials, the reaction is still a high-pressure reaction and cannot meet the requirements of industrialization.

Method used

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Examples

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Effect test

preparation example Construction

[0040] A preparation method of an iminodisuccinate chelating agent. All the raw materials are put into a reactor, then the temperature is raised, and the reaction is carried out under normal pressure. liquid.

[0041] Described reaction raw material comprises raw material A, raw material B, alkali metal hydroxide and water, and the concrete kind of raw material A, raw material B and alkali metal hydroxide is:

[0042] Raw material A is a compound from which a butenediolate group can be obtained by alkaline hydrolysis; preferably maleic anhydride, maleic acid, maleic acid salts, maleic acid derivatives, fumaric acid, Any of butenedioic acid salts and fumaric acid derivatives. Wherein, maleic acid derivative is preferably any one in maleic acid ester, maleic amide, maleic acid chloride; Fumaric acid derivative is preferably fumaric acid ester, fumaric acid derivative Any one of butenediamide and fumaryl chloride.

[0043] Raw material B is a compound that can obtain aspartic ...

Embodiment 1

[0052] Experimental design data:

[0053] Raw material A: 1 mole part; Raw material B: 1.0-1.1 mole part; Alkali metal hydroxide: 4.5-5.0 mole part; Water: 20-25 mole part.

[0054] Specific experimental process:

[0055] Add 5g (0.28mol) of water to a 2L four-neck flask, add 973g of sodium hydroxide solution with a mass percentage of 32% (including 7.78mol of sodium hydroxide and 36.76mol of water) while stirring, and slowly add 159g of (1.62mol) maleic anhydride, and finally add 225g (1.69mol) L-aspartic acid slowly, and control the temperature during the whole feeding process not to exceed 65°C; stir for 5 minutes after all the addition is complete to make the reaction system uniform, and the system The pH is around 12. Then raise the temperature to keep the temperature at 90±5°C for heat preservation reaction, the reaction time is 28h; after the reaction is completed, cool down to room temperature to obtain the tetrasodium iminodisuccinate mixed solution.

[0056] After...

Embodiment 2

[0058] Experimental design data:

[0059] Raw material A: 1 mole part; Raw material B: 0.9-1.0 mole part; Alkali metal hydroxide: 5.0-5.5 mole part; Water: 20-25 mole part.

[0060] Specific experimental process:

[0061] Add 450g (25mol) of water to a 2L four-neck flask, slowly add 291g (5.2mol) of potassium hydroxide under stirring, then slowly add 144g (1mol) of monoethyl maleate, and finally add 126g (0.95mol) of L -Aspartic acid, control the temperature during the whole feeding process to not exceed 65°C; stir for 5 minutes after all the addition is complete to make the reaction system uniform, and the pH value of the system is about 12 at this time. Then raise the temperature to keep the temperature at 75±5°C for heat preservation reaction, the reaction time is 19 hours; after the reaction is completed, cool down to room temperature to obtain the tetrapotassium iminodisuccinate mixed solution.

[0062] After testing, the solid content in the resulting mixed solution wa...

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Abstract

The invention discloses a preparation method of an imino disuccinate chelator. The reaction raw materials comprise a raw material A, a raw material B, alkali metal hydroxide and water, and the pH value of the reaction system is 6-12. The preparation method comprises the following steps: reacting at 65 DEG C under normal pressure until the raw materials are boiled to the reflux temperature; and after the reaction finishes, obtaining a mixed solution containing the imino disuccinate chelator, wherein the raw material A is a butene diacid radical compound prepared by alkaline hydrolysis, and the raw material B is an aspartate radical compound prepared by alkaline hydrolysis. The preparation method has the advantages of mild reaction conditions, short reaction time and high reaction yield, shortens the production process, enhances the production efficiency, lowers the production cost, and is an efficient and environment-friendly preparation method which is very suitable for industrialized mass production.

Description

technical field [0001] The invention relates to a preparation method of a metal chelating agent, in particular to a preparation method of an iminodisuccinate chelating agent. Background technique [0002] Chelating agent, also known as complexing agent, is an organic or inorganic compound that can chelate with heavy metal ions to form a stable water-soluble complex, thereby deactivating heavy metal ions. Chelating agent molecules contain electron donors that can coordinate and combine with heavy metal ions, and have a series of special functions such as softening, descaling, rust prevention, stabilization, and synergism, so they are widely used in water treatment, textile printing and dyeing, papermaking, etc. technology field. According to different molecular groups, chelating agents are roughly divided into phosphate chelating agents, aminocarboxylic acid chelating agents, hydroxycarboxylic acid chelating agents, organic phosphonate chelating agents, polycarboxylic acid c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C229/24C07C227/18
CPCC07C227/18C07C229/24C07C229/76
Inventor 李文曦邢振平
Owner HEBEI XIETONG ENVIRONMENTAL PROTECTION TECH CO LTD
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