Biurea synthesis technology

A synthesis process, biurea technology, applied in the field of biurea synthesis process, can solve the problems of high treatment costs, unaffordable enterprises, large water consumption, etc., to reduce production costs, ensure non-polluting discharge, and thoroughly treat waste liquid Effect
CN1733711AInactive Publication Date: 2006-02-15KAIFENG DONGDA CHEM GROUP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
KAIFENG DONGDA CHEM GROUP
Publication Date
2006-02-15
Estimated Expiration
Not applicable · inactive patent

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Abstract

The synthesis technique for LDA comprises, using hydrazine hydrate and urea as material, using pretreated HCl gas without excessive oxidizing substance to replace strong H2SO4 in existing technique and prepare the said product. To treat the waste liquid, according ammonia nitrogen content in waste, caltulating required vaporated water quantity to prepare NaCl and NH4Cl, crystallizing the NaCl and NH4Cl both of high purity by evaporation and condensation respectively, and the obtained water can be recycled; returning the last little waste liquid to system for treatment with new waste liquid. This invention has little corrosion to device and high product purity and yield, and ensures the no-pollutant discharge.
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Description

technical field

[0001] The invention relates to a urea synthesis process, in particular to a biurea synthesis process. Background technique

[0002] Biurea is an important intermediate for the production of ADC foaming agent (chemical name: azodicarbonamide), and it can also be used for anti-skid of airstrips, anti-skid of gears, fireproof and anti-solvent of advanced cables, etc.

[0003] The structural formula of biurea is:

[0004]

[0005] In the chemical industry, the traditional process for preparing biurea is mainly based on hydrazine hydrate (N 2 h 4 ·H 2 O) and urea (CO(NH 2 ) 2 ) as raw material, according to the ratio of hydrazine hydrate and urea 1: 3.75-3.9, using concentrated H 2 SO 4 It is prepared by condensation under acidic conditions of 4-5 by controlling the pH value. The main reaction formula in the preparation process is:

[0006] 1. Neutralization reaction

[0007] <chemistry num="001"> <chem file="20051...

Claims

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