Process for continuously producing azodicarbonamide (ADC) foaming agents in multi-kettle serial-connection mode

A technology of ADC foaming agent and multi-tank series, which is applied in the field of multi-tank series continuous production of ADC foaming agent, can solve problems such as operation difficulty and product quality difference, achieve controllable reaction, realize product quality, and continuous production Effect

Active Publication Date: 2012-07-18
HANGZHOU HI TECH FINE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the process of producing ADC foaming agent by urea method, indirect reaction is mostly used at present, that is, multiple reactors are mass-produced. There are quality differences in the products, and the follow-up operation is more difficult.

Method used

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  • Process for continuously producing azodicarbonamide (ADC) foaming agents in multi-kettle serial-connection mode
  • Process for continuously producing azodicarbonamide (ADC) foaming agents in multi-kettle serial-connection mode

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Effect test

Embodiment 1

[0017] The volume of three series-connected reaction tanks is 100L. Using this process, biurea is oxidized into ADC foaming agent by chlorine gas. First, 50kg of biurea slurry (containing 50% of biurea, percentage by weight) is added to the first In the reaction kettle, turn on the chlorine gas switch, add 5.18L of chlorine gas, turn on the agitator 1 to stir, and after stirring for 1 hour, control the flow rate of biurea to 20kg / h, the flow rate of chlorine gas to 5L / h, and the flow rate of chlorine gas in the second reactor to control 2L / h, the third reactor controls the urea flow rate of 2L / h, and the product from the third reactor is filtered, washed and dried to obtain the ADC foaming agent. After determination, under the same output, the continuous method can produce ADC foaming agent. The consumption of chlorine gas is saved by 30%, and the obtained ADC foaming agent has a uniform particle size and high product quality.

Embodiment 2

[0019] The biurea that adopts in embodiment 1, utilizes this technology to condense hydrazine hydrate and urea reaction into biurea, and the volume of three series-connected reactors is 100L, and the concentration of hydrazine hydrate is 40% (percentage by weight), at first Put 50kg of hydrazine hydrate into the first reactor, control the urea flow rate at 10kg / h, keep stirring for two hours, open the hydrazine hydrate control valve, control the hydrazine hydrate flow rate to 25kg / h, and control the urea flow rate in the second reactor 8kg / h, the third reactor controls the flow of urea to 6kg / h, and the product from the third reactor is filtered, washed and dried to obtain biurea. It has been determined that the operation of this continuous method can be more than that of the intermittent method every day. With a yield of 40%, the urea consumption can be saved by 30% under the same yield. The obtained biurea has uniform particle size and high purity.

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Abstract

The invention relates to a process for continuously producing azodicarbonamide (ADC) foaming agents in multi-kettle serial-connection mode, which includes a hydrazine hydrate and urea blending into biurea process and a biurea and chlorine oxidizing into ADC foaming agent process. In the biurea and chlorine oxidizing into ADC foaming agent process, two and more than two reaction kettles are adopted to be connected in series, and continuous reaction is achieved by continuously feeding and continuously stirring. Furthermore, in the hydrazine hydrate and urea blending into biurea process, two and more than two reaction kettles are adopted to be connected in series, and continuous reaction is achieved by continuously feeding and continuously stirring. The process has the advantages that by adopting the process for continuously producing ADC foaming agents in multi-kettle serial-connection mode, continuous production can be achieved, yield can be improved, uniformity of product quality can be achieved, reaction is controllable, and quality difference of products caused by multi-kettle reaction is avoided.

Description

technical field [0001] The invention relates to the field of ADC foaming agents, and mainly relates to a process for continuously producing ADC foaming agents in series with multiple kettles. Background technique [0002] The ADC synthesis process usually has three parts, the first step is the production of hydrazine hydrate, the second step is the condensation of hydrazine hydrate and urea to produce biurea, and the third step is the oxidation of biurea to produce ADC foaming agent. [0003] There are four kinds of processes for producing hydrazine hydrate at home and abroad: Raschig method, Bayer method, hydrogen peroxide method and urea method. Because of high energy consumption, complicated process route and low content of hydrazine hydrate in the product, Rasigaf method has been eliminated. The Bayer method is named after the development of the Bayer company in Germany. It is an improvement of the Rasig method, which uses ammonia as the main raw material, sodium hypoc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C281/20
Inventor 陈海贤董梅魏增
Owner HANGZHOU HI TECH FINE CHEM
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