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Method for recycling hydrochloric acid in production process of AC foaming agent

A hydrochloric acid recycling and production process technology, applied in organic chemistry and other directions, can solve the problems of complex process, difficult recovery, low hydrochloric acid reuse rate, etc., and achieve the effects of reducing costs, reducing the content of impurities, and controlling the reaction end point

Active Publication Date: 2019-04-26
JIANGXI SELON INDAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] In view of this, the present invention aims to propose a method for the recycling of hydrochloric acid in the production process of AC foaming agent, to solve the technical problems of low hydrochloric acid recycling rate, difficult recovery and complex process in the current AC foaming agent production process

Method used

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  • Method for recycling hydrochloric acid in production process of AC foaming agent
  • Method for recycling hydrochloric acid in production process of AC foaming agent
  • Method for recycling hydrochloric acid in production process of AC foaming agent

Examples

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Embodiment 1

[0045] like figure 1 As shown, a method for recycling hydrochloric acid in the production process of AC foaming agent, comprising the steps of: (1) oxidizing biuret with chlorine gas to obtain oxidation mother liquor; (2) centrifuging the oxidation mother liquor to obtain AC foaming agent and Centrifuge the mother liquor; (3) carry out at least three centrifugal washings on the AC foaming agent, and recycle the removal liquids of different centrifugal washings into different containers respectively, and apply the removal liquids when different batches of AC foaming agents are centrifugally washed, The removal liquid of the first centrifugal washing is used as a primary acid, and the removal liquid of the second centrifugal washing is used as a secondary acid; (4) the centrifugal mother liquor with a hydrochloric acid mass concentration of 20% and above is directly returned to the condensation reaction , or mixing the centrifugal mother liquor with hydrochloric acid mass concen...

Embodiment 2

[0051] like figure 1 As shown, a method for recycling hydrochloric acid in the production process of AC foaming agent, comprising the steps of: (1) oxidizing biuret with chlorine gas to obtain oxidation mother liquor; (2) centrifuging the oxidation mother liquor to obtain AC foaming agent and Centrifuge the mother liquor; (3) carry out at least three centrifugal washings on the AC foaming agent, and recycle the removal liquids of different centrifugal washings into different containers respectively, and apply the removal liquids when different batches of AC foaming agents are centrifugally washed, The removal liquid of the first centrifugal washing is used as a primary acid, and the removal liquid of the second centrifugal washing is used as a secondary acid; (4) the centrifugal mother liquor with a hydrochloric acid mass concentration of 20% and above is directly returned to the condensation reaction , or mixing the centrifugal mother liquor with a hydrochloric acid mass conc...

Embodiment 3

[0055] like figure 1 As shown, a method for recycling hydrochloric acid in the production process of AC foaming agent, comprising the steps of: (1) oxidizing biuret with chlorine gas to obtain oxidation mother liquor; (2) centrifuging the oxidation mother liquor to obtain AC foaming agent and Centrifuge the mother liquor; (3) carry out at least three centrifugal washings on the AC foaming agent, and recycle the removal liquids of different centrifugal washings into different containers respectively, and apply the removal liquids when different batches of AC foaming agents are centrifugally washed, The removal liquid of the first centrifugal washing is used as a primary acid, and the removal liquid of the second centrifugal washing is used as a secondary acid; (4) the centrifugal mother liquor with a hydrochloric acid mass concentration of 20% and above is directly returned to the condensation reaction , or mixing the centrifugal mother liquor with a hydrochloric acid mass conc...

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Abstract

The invention provides a method for recycling hydrochloric acid in the production process of an AC foaming agent. The method includes the steps that (1) an oxidation mother solution is obtained by chlorine oxidizing biurea; (2) the oxidation mother solution is subjected to centrifugal separation to obtain the AC foaming agent and a centrifugal mother solution; (3) the AC foaming agent is subjectedto centrifugal washing for at least three times, removal solutions for centrifugal washing at different times are recycled to different containers correspondingly, and the removal solutions are applied to obtain primary acid and secondary acid; (4) the hydrochloric acid prepared from the centrifugal mother solution is used for a condensation reaction, wherein the mass concentration of the hydrochloric acid is 20% or above; (5) the primary acid is mixed with the high concentration hydrochloric acid to prepare the hydrochloric acid with the mass concentration of 20% or above for a condensationreaction; and (6) the secondary acid is recovered and used for preparing a biurea oxidation reactor. According to the method for recycling the hydrochloric acid in the production process of the AC foaming agent, the process is simple, the recycling rate of the hydrochloric acid is high, and great economic value is achieved.

Description

technical field [0001] The invention relates to the field of AC foaming agents, in particular to a method for recycling hydrochloric acid in the production process of AC foaming agents. Background technique [0002] The chemical name of AC foaming agent is azodicarbonamide. It is a kind of foaming agent with large gas generation, superior performance and non-toxicity. It is widely used in the processing of foamed products such as plastics and rubber, and can also be used in the processing of certain foods. additive. [0003] Usually, the production of AC foaming agent is through the first condensation reaction of hydrazine hydrate and urea to form biuret, and then the biuret is oxidized with chlorine, sodium chlorate, hydrogen peroxide, etc. in the presence of a catalyst to form AC foaming agent. Wherein, the preparation method of biuret is to carry out condensation reaction preparation by hydrazine hydrate and urea under acidic conditions, and the reaction equation is as f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C281/20C07C281/06
CPCC07C281/06C07C281/20
Inventor 曹绍良徐长河陈保华
Owner JIANGXI SELON INDAL
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