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Technology for continuously producing hydrazine hydrate

A hydrazine hydrate and process technology, which is applied in the field of continuous production of hydrazine hydrate, can solve the problems of high energy consumption and material consumption, large equipment investment, high environmental protection pressure and the like, and achieves the effects of small investment and simple process

Active Publication Date: 2011-08-17
HANGZHOU HI TECH FINE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The Rasig method has serious environmental pollution, large investment in equipment, and low product yield. It has basically been eliminated abroad.
The urea process has high energy and material consumption, and the crude hydrazine produced contains a large amount of impurities such as sodium chloride, sodium carbonate, and sodium hydroxide, and the pressure on environmental protection is relatively high

Method used

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  • Technology for continuously producing hydrazine hydrate
  • Technology for continuously producing hydrazine hydrate
  • Technology for continuously producing hydrazine hydrate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] First, pass chlorine gas into the 25% sodium hydroxide solution to prepare a sodium hypochlorite solution with an available chlorine concentration of 120g / L and a free alkali concentration of 150-160g / L. Weigh 5kg of urea and add 17L of water to prepare a solution ,, and open the frozen brine inlet and outlet of the static mixer to maintain a constant temperature of 20°C. Add urea and sodium hypochlorite into the reactor and keep stirring. After 30 minutes, open the outlet of the reactor to allow the materials to enter the reactor, heat the reactor quickly until the temperature rises to 125°C, and the materials are discharged from the reactor. The detected yield of hydrazine hydrate is 85%.

Embodiment 2

[0032] First, pass chlorine gas into the 25% sodium hydroxide solution to prepare a sodium hypochlorite solution with an available chlorine concentration of 120g / L and a free alkali concentration of 150-160g / L. Weigh 5kg of urea and add 17L of water to prepare a solution ,, and open the frozen brine inlet and outlet of the static mixer to maintain a constant temperature of 20°C. Add urea and sodium hypochlorite into the reactor and keep stirring. After 40 minutes, open the outlet of the reactor to allow the materials to enter the reactor, heat the reactor quickly until the temperature rises to 125°C, and the materials are discharged from the reactor. The detected yield of hydrazine hydrate was 87%.

Embodiment 3

[0034] First, chlorine gas is introduced into a sodium hydroxide solution with a concentration of 25% to prepare a sodium hypochlorite solution with an available chlorine concentration of 120g / L and a free alkali concentration of 150-160g / L. Weigh 5kg of urea and add 17L of water to prepare Solution, and open the inlet and outlet of the frozen brine of the static mixer to maintain a constant temperature of 20°C. Add urea and sodium hypochlorite into the reactor and keep stirring. After 60 minutes, open the outlet of the reactor to allow the materials to enter the reactor, heat the reactor quickly until the temperature rises to 125°C, and the materials are discharged from the reactor. The detected yield of hydrazine hydrate is 90%.

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Abstract

The invention relates to a technology for continuously producing hydrazine hydrate. A two-step method is adopted for reaction in the technology and the two steps is as follows: firstly, urea and sodium hypochlorite are subjected to full oxidization reaction in low temperature, concretely, two or more than two static mixers with freezing brine jackets are adopted for fully mixing materials to ensure the full performance of the oxidization reaction; and secondly, the product of the first step reacts rapidly in high temperature under the action of sodium hydroxide and is subjected to Hofmann rearrangement so as to generate the hydrazine hydrate. The benefits are as follows: the method is simple in technology and can realize continuous production; only the quantity of the static mixers needs to be increased, so that the investment is little; and the content of the obtained hydrazine hydrate is over 85%.

Description

technical field [0001] The invention relates to a process for producing hydrazine hydrate, mainly a process for continuously producing hydrazine hydrate. Background technique [0002] Hydrazine hydrate, also known as hydrazine hydrate, is a monohydrate compound of hydrazine (N2H4·H2O). The appearance is a colorless transparent liquid, which can be mixed with water and alcohol arbitrarily, and is insoluble in ether and chloroform. Hydrazine hydrate is an important fine chemical intermediate, which is widely used in the synthesis of pesticides, medicines, water treatment, foaming agents, initiators and curing agents, etc., and has broad prospects for development and utilization. [0003] The production methods of hydrazine hydrate include Raschig method, urea method, ketazine method, hydrogen peroxide method and air oxidation method. Rasigaf has serious environmental pollution, large investment in equipment, and low product yield. It has basically been eliminated abroad. The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B21/16
Inventor 陈海贤董梅
Owner HANGZHOU HI TECH FINE CHEM
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