Clean production method of azodicarbonamide

The invention discloses a clean production method of azodicarbonamide, which comprises the following steps: (1) preparing sodium hypochlorite, preparing hydrazine hydrate by sodium hypochlorite, sodium hydroxide and urea, neutralizing the simultaneously-generated sodium carbonate with hydrochloric a...

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Main Authors TANTAI SHUXIAN, LIU ZIQIANG, WAN CHANGZHONG, ZHANG PINSAN, LI LIYING, WANG FUZHEN, LI FANXIU, ZHANG RUI, SUN SONGMAO, SHI GUANGMING, HAI GUODONG, WANG BOZHEN, MA SONGLIN, SUN JINFENG
Format Patent
LanguageChinese
English
Published 11.04.2012
Subjects
ACYCLIC OR CARBOCYCLIC COMPOUNDS
CHEMISTRY
METALLURGY
ORGANIC CHEMISTRY
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Summary:The invention discloses a clean production method of azodicarbonamide, which comprises the following steps: (1) preparing sodium hypochlorite, preparing hydrazine hydrate by sodium hypochlorite, sodium hydroxide and urea, neutralizing the simultaneously-generated sodium carbonate with hydrochloric acid; (2) mixing the hydrazine hydrate with hydrochloric acid and urea, stirring to prepare biurea, when the reaction is finished, filtering to obtain biurea, heating the obtained filtrate at 0.05-0.08 MPa till the filtrate is boiled, performing distillation and concentration, stopping distillation when the temperature of the mother liquor A is 85-110 DEG C, filtering to obtain sodium chloride, wherein the filtrate is a solution containing ammonium chloride, cooling to precipitate ammonium chloride crystals, filtering to obtain ammonium chloride, returning the filtrate into the mother liquor A for recycle; (3) performing a chlorination reaction of biurea and chlorine to prepare an azodicarbonamide product, separatin
Bibliography:Application Number: CN20111252895