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Continuous production method and continuous production device for synthesizing biruea

A production method, the technology of biurea, applied in the field of environment-friendly chemical production, can solve the problems of slow flow rate of reaction crystallization tube, problems of movement and discharge, unfavorable heat and mass transfer process, etc., and achieve narrow residence time distribution, The effect of large production capacity and reduced purification cost

Active Publication Date: 2013-07-03
ZHEJIANG ENG DESIGN +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For such a long reaction crystallization tube, it needs to be made into a back-and-forth baffled geometric structure, which will cause the movement and discharge of the reaction product - gaseous ammonia and solid biurea particles in the reactor, making the reactor Difficult to run stably and continuously
If the tube structure is used to reduce the length of the reaction crystallization tube, the flow rate in the reaction crystallization tube will be slow due to the increase of the cross-sectional area of ​​the flow channel, which is very unfavorable for the heat and mass transfer process in the reactor, and will cause biurea particles in the tube. accumulation problem

Method used

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  • Continuous production method and continuous production device for synthesizing biruea
  • Continuous production method and continuous production device for synthesizing biruea

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] Such as figure 1In the oscillating flow tube reaction crystallizer shown, the inner diameter of the reaction crystallization tube is 150 mm, and the height is 12000 mm. The spoiler baffle adopts a conical ring baffle with an opening ratio of 25%. Four heat exchange jackets are set outside the reaction crystallization tube to adjust the The inlet temperature of the heat medium makes the temperature distribution in the reaction crystallization tube 50, 90, 105, and 110°C from bottom to top; the lower part of the reaction crystallization tube is equipped with a plunger-type hydraulic diaphragm oscillating flow generator, the oscillation frequency is 1-3Hz, and the amplitude 5~50mm; the inner diameter of the gas-liquid-solid separator is 600mm, a wire mesh demister is installed on the top, and a heat exchange jacket is installed outside, and the inlet temperature of the heat medium is adjusted so that the liquid phase temperature in the separator is 110~120°C; the solid phas...

Embodiment 2

[0070] Such as figure 2 As shown, the reaction crystallization tube adopts a jacketed tube with a corrugated inner wall. The maximum inner diameter of the corrugated inner wall is 50 mm, the smallest inner diameter is 25 mm, the height is 2000 mm, and the inner diameter of the jacket is 80 mm. The lower part of the crystallization tube is equipped with a plunger-type diaphragm oscillating flow generator, the oscillation frequency is 1-3Hz, and the amplitude is 3-5mm; the inner diameter of the gas-liquid-solid separator is 100mm, and a heat exchange jacket is installed outside, and the inlet temperature of the heat medium is adjusted to make the separator The temperature of the liquid phase inside is 100-105°C; the solid phase discharge mechanism adopts a double-valve discharge device; the operating pressure of the reaction crystallizer is 0.15MPa.

[0071] The raw material preparation process uses a continuous stirring tank with an electric heating wall to realize the mixing ...

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Abstract

Disclosed is a continuous manufacturing method for the synthesis of hydazo dicarbonamide. The method comprises: (1) adding hydrazine hydrate and a urea solution into an oscillating flow tube crystallizer via the mid-lower section thereof, producing via reaction hydazo dicarbonamide particles; (2) with the progression of the reaction and the crystallization process, the hydazo dicarbonamide particles grow in diameter and settle towards the bottom of the tube crystallizer, continuously discharging the hydazo dicarbonamide particles settled at the bottom of the tube crystallizer, and acquiring the hydazo dicarbonamide via solid-liquid separation and washing; (3) continuously discharging a pregnant solution containing unconverted reactants from the upper part of the tube crystallizer, and continuously discharging a byproduct, ammonia, from the top part of the tube crystallizer. Also disclosed is the oscillating flow tube crystallizer for use in implementing the manufacturing method.

Description

technical field [0001] The invention relates to the field of chemical synthesis, in particular to a continuous industrial production method for synthesizing biurea by using hydrazine hydrate and urea as raw materials, which belongs to the environment-friendly chemical production technology. Background technique [0002] Biurea (NH 2 CONHNHCONH 2 ) is a synthetic industrial chemical, which is widely used as a raw material for the production of ADC foaming agent (azodicarbonamide) in addition to being used as a high-grade anti-slip agent, fire-proof additive and anti-solvent additive for electrical plastics. [0003] One of the industrial production methods of biurea widely adopted at present is by hydrazine hydrate (N 2 h 4 ·H 2 O) and urea (NH 2 CONH 2 ) condensation reaction generates biurea, and its chemical reaction equation is: [0004] N 2 h 4 ·H 2 O+2NH 2 CONH 2 =NH 2 CONHNHCONH 2 +2NH 3 +H 2 o [0005] The above reaction is carried out in the liquid p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C281/06C07C273/18B01D9/02
CPCB01D9/0054C07C281/06Y02P20/582
Inventor 吴嘉侯章德胡晓萍韦敏光李伟苏文江王向峰江炜
Owner ZHEJIANG ENG DESIGN
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