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Method for chemically regulating particle size of azobisformamide

An azodicarbonamide and chemical regulation technology, applied in the chemical industry, can solve the problems of unable to meet market demand, wide product particle size distribution, low product addition, etc., to improve market competitiveness and economic benefits, improve product quality and product quality. The effect of product added value

Inactive Publication Date: 2014-06-04
陈世豪
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a kind of chemical control azodicarbonamide particle size for the defect that the foaming agent ADC produced in our country has a single variety and cannot meet the market demand; The method, the present invention does not need to change the original technological process of producing azodicarbonamide, and the addition of chemical auxiliary agents is convenient and low in cost; the product quality and product added value of azodicarbonamide are improved, and the market of the product is improved Competitiveness and Economic Benefits

Method used

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  • Method for chemically regulating particle size of azobisformamide
  • Method for chemically regulating particle size of azobisformamide

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Experimental program
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Effect test

Embodiment 1

[0010] Add the mother liquor into the 130L reactor, then add 25Kg of biurea, catalyst; add sulfuric acid until the acidity of the mother liquor is 4mol / L, control the reaction temperature at 40~60°C, liquid-solid 1:4, urotropine in the feed liquid Content 0.36~2.0g / L, NaCLO 3 The concentration is 50%, the rotameter is used to add dropwise, and the mother liquor is recycled and applied repeatedly. The particle size of the foaming agent ADC product is detected by the SKC-2000 light-transmitting particle size distribution instrument (manufactured by Japan Co., Ltd. Qingxin Enterprise).

[0011] Table 1 (pilot test) List of particle sizes of foaming agent ADC produced by sodium chlorate oxidation of biurea

[0012]

Embodiment 2

[0014] Add the mother liquor into the 130L reactor, then add 25Kg of biurea, add catalyst and co-catalyst, add sulfuric acid until the acidity of the mother liquor is 6.5mol / L, control the reaction temperature at 50~70℃, liquid-solid 1:4, urethane The content of tropin in the feed liquid is 0.1-2.0g / L, the concentration of hydrogen peroxide is 60%, the rotameter is used to add dropwise, and the mother liquor is recycled and applied mechanically. Diameter distribution meter detection (manufactured by Qingxin Enterprise, Japan Co., Ltd.).

[0015] Table 2 (pilot test) List of particle sizes of foaming agent ADC produced by hydrogen peroxide oxidation of biurea

[0016]

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Abstract

The invention relates to a method for chemically regulating particle size of azobisformamide. In the process of producing azobisformamide by oxidizing biurea with an oxidizer, 1,3,5,7-tetraazatricyclo[3.3.1.1]decane is added to regulate the particle size of the azobisformamide product. The invention does not need to change the original technical process for producing azobisformamide, and the added chemical assistant is convenient to operate and low in cost. The invention improves the quality and added value of the azobisformamide product, and enhances the market competitiveness and economic benefit of the product.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to a method for chemically regulating the particle size of azodicarbonamide. Background technique [0002] Azodicarbonamide (trade name: blowing agent ADC) is currently the largest organic blowing agent, it is suitable for processing PE, PVC, PS, PP, ABS, EVA and neoprene, nitrile rubber, styrene-butadiene rubber Rubber, butyl rubber, artificial leather, plastic wallpaper and other plastic leather foaming, is the best variety of organic foaming agents. my country is the country with the largest production capacity of blowing agent ADC in the world, mainly using hydrogen peroxide, sodium chlorate or chlorine gas as the oxidant to oxidize biurea to produce blowing agent ADC products. [0003] An important indicator to measure the quality of foaming agent ADC products is the product particle size and distribution state. The particle size distribution of existing products i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C281/20
Inventor 陈世豪陈学晨黄兵
Owner 陈世豪
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