A method for removing organic impurities of ketazine method hydrazine hydrate

A technology of organic impurities, ketazine method, applied in the direction of nitrogen and non-metallic compounds, hydrazine, etc., can solve the problems of high non-volatile matter, high final TOC content, long process, etc., and achieve the effect of simple method

Active Publication Date: 2017-09-26
YIBIN HAIFENG HERUI
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AI Technical Summary

Problems solved by technology

In the impurity removal process of hydrazine hydrate prepared by the ketazine method, if the distillation method can only remove the non-volatile substances and high-boiling impurities in hydrazine hydrate, it cannot change the properties of macromolecular organic substances, and it is not easy to remove them from the hydrazine hydrate solution by evaporation, making the product The final TOC content in the hydrazine hydrate is relatively high, which does not meet the customer's requirements; liquid-liquid extraction uses the principle of similar miscibility to remove part of the organic matter from hydrazine hydrate, but it has no effect on ionic impurities, making the non-volatile matter in the product relatively low. High, can not meet the product quality requirements, and involves the regeneration operation of the extractant and the treatment of the regeneration waste liquid, the process is long and the operation is complicated; resin adsorption is effective for some ionic impurities and some organic substances in hydrazine hydrate, if not combined Other treatment methods are also difficult to meet product quality requirements. Resin adsorption also involves issues such as resin regeneration. The operation is complicated and the process is long
In summary, there is currently no effective and simple method for simultaneously removing various organic impurities produced by the ketazine method of hydrazine hydrate

Method used

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  • A method for removing organic impurities of ketazine method hydrazine hydrate

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Experimental program
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Effect test

Embodiment 1

[0021] (1) Evaporation step: Send the crude hydrazine hydrate solution containing impurities into the evaporator, add half of the liquid level of 30% sodium hydroxide solution to the evaporator, about 800kg, and then add the hydrazine hydrate solution with a TOC content of 7530ppm to the evaporator 2 / 3 liquid level, the temperature of the evaporator is controlled at 122°C, and the pressure is 0.08MPa for continuous evaporation, so that it can destroy the structure of organic impurities at a higher temperature, and hydrazine hydrate and low-boiling organic impurities are evaporated in the form of gas. Refractory macromolecular organic impurities and non-volatile matter are left at the bottom of the evaporator for removal. After the evaporation amount is significantly reduced, discharge the waste liquid in the evaporator, and replace the sodium hydroxide. According to the impurities in the hydrazine hydrate, the amount of alkaline earth metals is generally 0.15~0.2% of the amount...

Embodiment 2

[0024] (1) Evaporation step: Send the crude hydrazine hydrate solution containing impurities into the evaporator, add 800kg of potassium hydroxide solid into the evaporator, and then add the hydrazine hydrate solution with a TOC content of 7500ppm to 2 / 3 of the liquid level to control evaporation The temperature of the device is 125°C, and the pressure is 0.08MPa for continuous evaporation, so that it can destroy the structure of organic impurities at a higher temperature. Hydrazine hydrate and low-boiling organic impurities are evaporated in the form of gas. The non-volatiles remained at the bottom of the evaporator for removal. After the evaporation amount is significantly reduced, discharge the waste liquid in the evaporator, and replace the potassium hydroxide. According to the impurities in the hydrazine hydrate, the amount of alkaline earth metals is generally 0.15~0.2% of the amount of hydrazine hydrate required to be treated;

[0025] (2) Fractionation step: Send the i...

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Abstract

The invention discloses a method for removing organic impurities in hydrazine hydrate prepared through a ketazine method. according to the method, a certain amount of an alkaline earth metal hydroxide is added into an evaporator for destroying the chemical constitution and properties of organic impurities, the organic impurities are decomposed at a high temperature and form small molecules through steps of evaporation and fractionation, and high-boiling-point organic impurities and non-volatile impurities are deposited at the bottom of the evaporator and are removed, and low-boiling-point organics enter into distillate water via a fractionating tower and are brought away. The processing method enables the TOC content of hydrazine hydrate organic impurities to be reduced to 500 ppm from 7000-8000 pp, and enables the content of involatile impurities to be reduced to less than 0.01%, and commercial hydrazine hydrate applicable to production of medicines, pesticides, foaming agents and other chemicals can be obtained.

Description

technical field [0001] The invention relates to a method for removing organic impurities in hydrazine hydrate, in particular to a method for removing organic impurities in hydrazine hydrate produced by a ketazine method. Background technique [0002] Hydrazine hydrate, also known as: hydrazine hydrate, chemical formula is N 2 h 4 ·H 2 O, a strong reducing agent, is an important chemical raw material, and is also a raw material for medicine, pesticides, dyes, foaming agents, developers, and antioxidants; it is used for deoxidizing boiler water, producing high-purity metals, and synthesizing and reducing organic compounds. , separation of rare elements, and also used in the manufacture of rocket fuel and explosives. With the advancement of technology and the development of society, the application fields of hydrazine hydrate are also expanding in recent years. [0003] The production methods of hydrazine hydrate mainly include Raschig method, urea method, ketazine method, h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B21/16
CPCC01B21/16
Inventor 邓敏万立周明柴进祥刘志明张进萍陈尚思
Owner YIBIN HAIFENG HERUI
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