A kind of preparation method of chelating agent n,n'-ethylenediamine disuccinic acid sodium salt

A technology of ethylenediamine disuccinate and ethylenediamine, which is applied in the field of preparation of chelating agent N,N'-ethylenediamine disuccinate sodium salt, can solve difficult separation, many by-products, long reaction time, etc. problem, achieve the effect of reducing the reaction time, increasing the adding speed and increasing the yield

Active Publication Date: 2021-03-12
SHANDONG TAIHE WATER TREATMENT TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high mass percentage concentration of the alkali solution, the process of adjusting the pH value of the system requires strict temperature control to prevent the system temperature from rising sharply, the reaction time is long, and the conversion rate of ethylenediamine is low.
(2) In the patent US 5554791, Yabao Company of the United States described the nucleophilic elimination reaction of L-aspartic acid and 1,2-dihaloalkane in alkaline medium. This method will generate a large amount of L-aspartate At the same time, the reaction activity of halogenated hydrocarbons is relatively high, and primary amines and secondary amines can be generated during the nucleophilic elimination reaction, which makes the reaction conversion rate low, with many by-products and difficult to separate

Method used

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  • A kind of preparation method of chelating agent n,n'-ethylenediamine disuccinic acid sodium salt

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Preheat the reactor to 60°C, add liquid maleic anhydride to the reactor, start stirring, raise the temperature and control the temperature of the system within the range of 75~77°C, add 30% aqueous sodium hydroxide solution dropwise to adjust the pH of the system to 11 . Add ethylenediamine dropwise to the reaction kettle, increase the pressure of the reaction system to 0.3MPa, raise the temperature to 146°C and keep it under reflux for 4 hours, then lower the temperature and pressure to obtain the finished product of N,N'-ethylenediamine disuccinic acid sodium salt. The yield was 92.2% based on N,N'-ethylenediamine disuccinic acid sodium salt.

Embodiment 2

[0034] The method of increasing the reaction system pressure to 0.3MPa in Example 1 is replaced by raising the reaction system pressure to 0.5MPa. The yield was 90.2% based on N,N'-ethylenediamine disuccinic acid sodium salt.

Embodiment 3

[0036] Preheat the reaction kettle to 55°C, add liquid maleic anhydride to the reaction kettle, start stirring, raise the temperature and control the system temperature within the range of 76~80°C, add 20% aqueous sodium hydroxide solution dropwise to adjust the pH of the system to 10.8 . Add ethylenediamine dropwise to the reaction kettle, raise the pressure of the reaction system to 0.2MPa, raise the temperature to 155°C and keep it under reflux for 4 hours, lower the temperature and reduce the pressure to obtain the finished product of N,N'-ethylenediamine disuccinic acid sodium salt. The yield is 92.3% based on N,N'-ethylenediamine disuccinic acid sodium salt.

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Abstract

The invention discloses a preparation method of chelating agent N,N'-ethylenediamine disuccinic acid sodium salt. The method uses maleate and ethylenediamine to perform Michael addition reaction under high pressure to prepare N,N'-ethylenediamine disuccinic acid sodium salt. The invention has the advantages of short reaction time, high yield, mild reaction and easy control. The prepared N,N'-ethylenediamine disuccinic acid sodium salt has the advantages of fast mineralization, easy degradation in the environment, low biological toxicity, strong metal ion chelating ability, and convenient use, making it suitable for use in heavy metal-polluted soils. There is a tendency to gradually replace chelating agents such as EDTA and NTA in the restoration of the skin.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a preparation method of a chelating agent N,N'-ethylenediamine disuccinic acid sodium salt. Background technique [0002] Soil phytoremediation technology is to use green plants and their microorganisms to extract, transfer, absorb, decompose, transform or fix organic or inorganic pollutants such as heavy metals in soil and Remove them from the soil, so as to purify the pollutants in the soil and achieve the purpose of purifying the environment. Therefore, soil phytoremediation technology is a green technology with great development potential to control environmental pollution. While repairing the soil, this technology also purifies and greens the surrounding environment. While in-situ treating the soil, it also increases the content of soil organic matter and soil fertility, with little interference to the environment and low technical cost. At pres...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C227/08C07C229/24
CPCC07C227/08C07C229/24
Inventor 陈树招周荣奇程终发李鹏飞王燕平刘全华
Owner SHANDONG TAIHE WATER TREATMENT TECH CO LTD
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