Method for preparing iminodiacetic acid through continuous hydrolysis and self-oscillating reactor

A technology of iminodiacetic acid and iminodiacetonitrile, which is applied in the field of self-oscillating reactors and continuous hydrolysis to prepare iminodiacetic acid, can solve the problems of low reaction efficiency and long residence time, and achieve improved reaction rate, Effect of reduced water consumption, good reaction and temperature control effect

Active Publication Date: 2017-06-30
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the way of multi-stage tank reactors in series makes the residence time of materials longe

Method used

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  • Method for preparing iminodiacetic acid through continuous hydrolysis and self-oscillating reactor

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Effect test

Embodiment 1

[0045] A method for preparing iminodiacetic acid by continuous hydrolysis, comprising the steps of:

[0046] Step S1: mixing the reaction material iminodiacetonitrile and water according to the molar ratio of 1:5;

[0047] Specifically, the raw material iminodiacetonitrile is transported to the solid-liquid mixing device 12 through the metering screw 11; the raw material water is also transported to the solid-liquid mixing device 12, and the two are mixed in proportion;

[0048] Step S2: transporting the mixed material to the fully mixed reactor 3 for hydrolysis;

[0049] Specifically, the material delivery pump 13 transports the mixed material to the heat exchanger 2 to heat the reaction material, and after heating, the reaction material enters the fully mixed reactor 3 through the second feed port 32; And control the reaction temperature in the fully mixed reactor 3 to be 190°C, and the reaction pressure to be 9MPa;

[0050] Step S3: the reaction liquid in the fully mixed ...

Embodiment 2

[0056] A method for preparing iminodiacetic acid by continuous hydrolysis, comprising the steps of:

[0057] Step S1: mixing the reaction material iminodiacetonitrile and water according to the molar ratio of 1:10;

[0058] Step S2: transporting the mixed material to the fully mixed reactor 3 for hydrolysis;

[0059] Specifically, the material delivery pump 13 transports the mixed material to the heat exchanger 2 to heat the reaction material, and after heating, the reaction material enters the fully mixed reactor 3 through the second feed port 32; Control the reaction temperature to 195°C and the reaction pressure to 10MPa;

[0060] Step S3: the reaction liquid in the fully mixed reactor 3 flows into the tubular reactor 4 under the action of liquid head pressure;

[0061] Specifically, when the materials in the full-mixing reactor 3 have reacted to a certain extent, the materials flow out from the second discharge port 33 under the action of the pressure difference, and ent...

Embodiment 3

[0065] A method for preparing iminodiacetic acid by continuous hydrolysis, comprising the steps of:

[0066] Step S1: mixing the reaction raw material iminodiacetonitrile and water according to the molar ratio of 1:20;

[0067] Step S2: transporting the mixed material to the fully mixed reactor 3 for hydrolysis;

[0068] Specifically, the material delivery pump 13 transports the mixed material to the heat exchanger 2 to heat the reaction material, and after heating, the reaction material enters the fully mixed reactor 3 through the second feed port 32; Control the reaction temperature to 200°C and the reaction pressure to 11MPa;

[0069] Step S3: the reaction liquid in the fully mixed reactor 3 flows into the tubular reactor 4 under the action of liquid head pressure;

[0070] Specifically, when the materials in the full-mixing reactor 3 have reacted to a certain extent, the materials flow out from the second discharge port 33 under the action of the pressure difference, and...

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Abstract

The invention discloses a method for preparing iminodiacetic acid through continuous hydrolysis. The method comprises the following steps: mixing reaction material imidogen diacetonitrile and water in proportion; providing a perfectly mixed reactor, conveying the reaction material into the perfectly mixed reactor, so as to perform hydrolysis reaction; providing a tubular reactor, and conveying reaction liquid in the perfectly mixed reactor into the tubular reactor under the action of liquid level difference pressure; providing a product storage tank, ensuring that the reaction material performs periodic self-oscillating flowing between the tubular reactor and a product storage tank, discharging a product into the product storage tank after reaction. The method for preparing iminodiacetic acid through continuous hydrolysis improves the reaction yield. The invention further provides a self-oscillating reactor.

Description

technical field [0001] The invention relates to the technical field of chemical equipment, in particular to a method for preparing iminodiacetic acid by continuous hydrolysis and a self-oscillating reactor. Background technique [0002] In chemical reactions, liquid-solid reactions are mostly carried out in tank reactors. Interphase mass transfer, mixing and heat transfer are important technical indicators that determine the performance of the reactor, and directly affect the reaction intensity, conversion rate and product quality. According to the mode of operation, tank reactors include batch tank reactors and continuous tank reactors, among which batch tank reactors are suitable for the production of products with small batches, multiple varieties, and long reaction times, but have the disadvantage of unstable product quality. characteristics, and the types of reactants are limited; the continuous tank reactor can avoid the disadvantages of the batch tank reactor, but the...

Claims

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Application Information

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IPC IPC(8): C07C227/26C07C229/16B01J19/18B01J19/00
CPCB01J19/0006B01J19/0013B01J19/0046B01J19/18B01J19/185B01J2219/00051B01J2219/00092B01J2219/00162C07C227/26C07C229/16
Inventor 艾秋红黄荣辉
Owner XIANGTAN UNIV
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