Method for preparing azobisformamide by oxidizing biurea with sodium chlorate
A technology of azodicarbonamide and biurea, applied in the direction of organic chemistry, can solve the problems of foaming agent ADC decomposition, difficult control of the reaction end point, and environmental pollution of chlorine gas, so as to reduce environmental protection costs and achieve significant economic and social benefits , the effect of reducing environmental pollution
Inactive Publication Date: 2012-09-12
福州一化化学品股份有限公司
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Problems solved by technology
[0002] Traditionally, the blowing agent azodicarbonamide (ADC) is prepared by oxidizing biurea with chlorine gas, which has the advantage of low cost, but it is difficult to control the end point of the reaction, and the amount of chlorine passing through exceeds the standard or the temperature of chlorine passing is too high, which may easily cause the blowing agent ADC Decomposition; when the chlorine flow is insufficient, a small amount of biurea remains in the foaming agent ADC and affects its quality
At the same time, the yield of ADC products in this process is low, the quality is unstable, and the acid produced in the reaction and the escape of excess chlorine at the end point will easily cause problems such as environmental pollution.
Method used
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Experimental program
Comparison scheme
Effect test
Embodiment 1
[0016] Biurea 4000kg, temperature 50-54°C, time 5 hours and 30 minutes, acidity 4.0N, sodium bromide 3kg, ferric chloride concentration 3.7g / L, sodium chlorate dosage 1112kg, ADC yield 95%.
Embodiment 2
[0018] Biurea 4000kg, temperature 50-54℃, time 5 hours and 10 minutes, acidity 4.8N, sodium bromide 3kg, ferric chloride concentration 3.0g / L, sodium chlorate dosage 1100kg, ADC yield 92%.
Embodiment 3
[0020] Biurea 4000kg, temperature 45-48℃, time 6 hours and 50 minutes, acidity 4.0N, sodium bromide 4kg, ferric chloride concentration 3.0g / L, sodium chlorate dosage 1100kg, ADC yield 95.2%.
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The invention discloses a method for preparing azobisformamide by oxidizing biurea with sodium chlorate. Biurea is oxidized to prepare the azobisformamide by using sodium chlorate as an oxidizer and iron-containing halide as a catalyst. The invention has the advantages of controllable product particle size, simple preparation technique and stable product quality, and has obvious economic and social benefits.
Description
technical field [0001] The invention relates to the technical field of chemical production, in particular to a method for preparing azodicarbonamide by oxidizing biurea with sodium chlorate. Background technique [0002] Traditionally, the blowing agent azodicarbonamide (ADC) is prepared by oxidizing biurea with chlorine gas, which has the advantage of low cost, but it is difficult to control the end point of the reaction, and the amount of chlorine passing through exceeds the standard or the temperature of chlorine passing is too high, which may easily cause the blowing agent ADC Decomposition; when the chlorine flow is insufficient, a small amount of biurea remains in the foaming agent ADC and affects its quality. Simultaneously, the yield of the ADC product of this process is low, the quality is unstable, and the acid produced in the reaction and the escape of excessive chlorine gas at the end point easily cause problems such as environmental pollution. Contents of the ...
Claims
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Inventor 周沂陈世豪
Owner 福州一化化学品股份有限公司
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