Concentration method of 40% methylhydrazine aqueous solution

A mass concentration, methylhydrazine technology, applied in the preparation of hydrazine, organic chemistry, etc., can solve problems such as leakage, methylhydrazine explosion, safety accidents, etc., and achieve the effect of simple process, convenient operation, safe and reliable process

Active Publication Date: 2013-06-12
DONGLI NANTONG CHEM
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Problems solved by technology

At present, the concentration process of methylhydrazine mostly adopts the method of firstly separating methylhydrazine and then rectifying, but in the rectifying process, methylhydrazine is easy to explode under high temperature, causing leakage and safety accidents

Method used

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Embodiment Construction

[0009] The mass concentration is the 40% methylhydrazine aqueous solution concentration method, at first to 100g mass concentration is 40% methylhydrazine aqueous solution, add 100g mass concentration to be 95% ethylene glycol, carry out rectification after water absorption is finished, rectification ends Finally, in the top of the tower is methylhydrazine with a mass concentration of 98%, and in the bottom of the tower is 70% ethylene glycol solution. After vacuum distillation, the water is removed for reuse.

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Abstract

The invention discloses a concentration method of a 40% methylhydrazine aqueous solution. The concentration method is characterized by comprising steps of water adsorption and rectification, wherein the water adsorption step serves 95% ethylene glycol as a water absorbent. The concentration method has the advantages of simple technology, convenience in operation, good concentration effect and safe and reliable whole process.

Description

technical field [0001] The invention relates to a process for concentrating a methylhydrazine aqueous solution, in particular to a method for concentrating a methylhydrazine aqueous solution with a mass concentration of 40% to 98%. Background technique [0002] Methylhydrazine is an important intermediate for the synthesis of some high-quality pesticides and medicines. At the same time, it forms a bicomponent liquid propellant with oxidants such as dinitrogen tetroxide, which is widely used in the monitoring systems of space shuttles, spacecraft and satellites. The mass concentration of the methylhydrazine aqueous solution on the market is mostly 40%, and its price is about 50,000 yuan / ton, while the price of methylhydrazine with a mass concentration of 98% reaches 400,000 yuan / ton. At present, the concentration process of methylhydrazine mostly adopts the method of firstly separating methylhydrazine and then rectifying. However, methylhydrazine is easy to explode under high...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C243/14C07C241/02
Inventor 周建陆立新杨得山
Owner DONGLI NANTONG CHEM
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