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Method for continuously producing iminodiacetic acid disodium salt

A technology of iminodiacetic acid disodium salt and iminodiacetonitrile, applied in the field of continuous production of iminodiacetic acid disodium salt, can solve the problems of poor practical value, high cost, short process route, etc. The effect of production volume and production cost reduction

Inactive Publication Date: 2019-06-07
安道麦股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the process of producing glyphosate, diethanolamine uses Cu / Zr carrier catalyst, and the oxidation reaction of diethanolamine and sodium hydroxide produces iminodiacetic acid. However, the cost of Cu / Zr carrier catalyst is relatively high. Considering the production cost, the practical value It is not as good as the oxidation of iminodiacetonitrile to generate iminodiacetic acid. Among them, the synthesis of diglyphosate by IDAN method has the characteristics of short process route and easy large-scale equipment. However, when iminodiacetonitrile generates iminodiacetic acid, the by-product ammonia will be generated

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Prepare liquid caustic soda with a concentration of 30.5%, iminodiacetonitrile slurry with a concentration of 38.8%, feed the liquid caustic soda and iminodiacetonitrile slurry continuously into the reactor at a volume ratio of 0.93:1, and react at 45-60°C 50-60min. The reacted material is deaminated and concentrated through the primary evaporator, the temperature of the primary evaporator is controlled at 120-140°C, and the pressure of the primary separator is 0.1-0.25MPa. The material after being deaminated and concentrated by the primary evaporator is transferred to the secondary evaporator for deammonization and concentration again. The temperature of the secondary evaporator is controlled at 85-105°C, the pressure of the secondary separator is -0.2-0MPa, and the deammonization concentration is 40.0 -44.0% iminodiacetic acid disodium salt.

Embodiment 2

[0015] Prepare liquid caustic soda with a concentration of 31.0%, iminodiacetonitrile slurry with a concentration of 39.9%, feed the liquid caustic soda and iminodiacetonitrile slurry into the reactor continuously at a volume ratio of 0.93:1, and react at 45-60°C 50-60min. The reacted material is deaminated and concentrated through the primary evaporator, the temperature of the primary evaporator is controlled at 120-140°C, and the pressure of the primary separator is 0.1-0.25MPa. The material after being deaminated and concentrated by the primary evaporator is transferred to the secondary evaporator for deammonization and concentration again. The temperature of the secondary evaporator is controlled at 85-105°C, the pressure of the secondary separator is -0.2-0MPa, and the deammonization concentration is 40.0 -44.0% iminodiacetic acid disodium salt.

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Abstract

The invention relates to a method for continuously producing iminodiacetic acid disodium salt. The disodium salt is formed by performing hydrolysis on iminodiacetonitrile under alkaline conditions, inparticular, the method comprises the following steps: the iminodiacetonitrile and liquid sodium hydroxide are thrown into a reactor according to a molar ratio of 1:(2.0-2.3), a reaction is performedunder a reaction temperature condition of 45-60 DEG C for 50-60 min, the material in the reactor overflows to a middle buffer tank, a reaction is performed in a primary deamination evaporator, a reaction is performed in a primary gas-liquid separator, a reaction is performed in a deamination gas-liquid separator, a reaction is performed in a secondary deamination evaporator, a reaction is performed in a secondary gas-liquid separator to remove by-product ammonia under negative-pressure condition, and therefore the product disodium salt is obtained after the deamination is completed. Accordingto the iminodiacetic acid disodium salt prepared by the method, the production efficiency can be greatly improved, the product quality can be improved, the production costs can be reduced, the energyconsumption can be saved, the iminodiacetic acid disodium salt can be continuously and stably produced, and therefore the production is more environmentally friendly, safer, and more energy-saving.

Description

technical field [0001] The invention relates to the field of pesticide production, in particular to a method for continuously producing iminodiacetic acid disodium salt. Background technique [0002] Iminodiacetic acid disodium salt is an important raw material for the synthesis of iminodiacetic acid, and iminodiacetic acid is an important chemical intermediate, mainly used in organic synthesis and pharmaceutical industry, as an important intermediate for the synthesis of diglyphosate body, which occupies a considerable proportion in the application of the pesticide industry. There are many synthetic methods of IDA, including chloroacetic acid glycine method, aminochloroacetic acid method, nitrilotriacetic acid method, iminodiacetonitrile hydrolysis method, diethanolamine dehydrogenation method, etc. At present, domestic and foreign IDA method glyphosate production enterprises mainly use diethanolamine method (DEA method) and iminodiacetonitrile method (IDAN method) to prep...

Claims

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Application Information

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IPC IPC(8): C07C227/26C07C229/16
Inventor 殷宏艾秋红付立平张江红康进明常鹏
Owner 安道麦股份有限公司