Method for preparing azobisformamide by oxidizing biurea with sodium chlorate

Abstract

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 ...

AI Technical Summary

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.