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Method for removing organic matter from ketazine process hydrazine hydrate

A technology of ketazine method and hydrazine hydrate, which is applied in the direction of nitrogen and non-metallic compounds, hydrazine, etc., can solve the problem that organic impurities cannot be removed, and achieve the effect of reducing operating costs, low energy consumption, and simple and easy operation

Active Publication Date: 2016-01-20
YIBIN HAIFENG HERUI
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Problems solved by technology

This method can remove organic matter with a boiling point higher or lower than hydrazine hydrate, but cannot remove organic impurities with a boiling point similar to hydrazine hydrate, such as pyrazoline, pyrrole, pyridine and other organic matter, which limits the use of hydrazine hydrate in medicine or has higher requirements for impurities. high-end applications

Method used

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  • Method for removing organic matter from ketazine process hydrazine hydrate
  • Method for removing organic matter from ketazine process hydrazine hydrate
  • Method for removing organic matter from ketazine process hydrazine hydrate

Examples

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Effect test

Embodiment 1

[0032] Add 100L of hydrazine hydrate with a hydrazine content of 60% (weight) and 200L of extractant toluene into the extraction tower, stir at 35°C for 3 minutes and then let stand for 10 minutes, phase separation occurs, and the organic layer is removed to obtain hydrated Hydrazine solution, and then pass the hydrazine hydrate solution with lower TOC content into the subsequent rectification system for rectification and impurity removal, and the TOC removal rate reaches 99.13%. The extraction agent toluene containing a large amount of organic impurities in the extraction tower is sent to the extraction agent regeneration tower, and pure water is used for back extraction and purification, and then stored in the extraction agent transfer tank for use in the extraction tower extraction. The whole extraction process is carried out continuously in the extraction tower without interruption.

Embodiment 2

[0034] Add 100L of hydrazine hydrate with a hydrazine content of 60% (weight) and 400L of extractant toluene to the extraction tower, stir at 40°C for 3 minutes and then let stand for 12 minutes, phase separation occurs, and the organic layer is removed to obtain hydrated Hydrazine solution, and then the hydrazine hydrate solution with lower TOC content was rectified to remove impurities. TOC analysis showed that the TOC removal rate reached 99.63%, and the TOC content dropped to 83ppm.

Embodiment 3

[0036] Add 100L of hydrazine hydrate with a high TOC content of 60% (weight) of hydrazine to be removed and 500L of extractant aniline into the extraction tower, stir at 45°C for 3 minutes and then let stand for 15 minutes, phase separation occurs, and organic layer to obtain a hydrazine hydrate solution, and then rectify the hydrazine hydrate solution with a low TOC content to remove impurities. The TOC analysis shows that the TOC removal rate reaches 99.66%, and the TOC content drops to 75ppm. The extraction agent aniline containing a large amount of organic impurities in the extraction tower is sent to the extraction agent regeneration tower, and pure water is used for back extraction and purification, and then stored in the extraction agent transfer tank for use in extraction.

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Abstract

The invention relates to the technical field of organic matter removal, in particular to a method for removing organic matter from ketazine process hydrazine hydrate. The method includes the following steps that firstly, rough hydrazine hydrate which is fed by a hydrolysis system and contains organic impurities is mixed with an extraction agent to be extracted, and then the hydrazine hydrate is separated from the extraction agent containing the organic impurities, wherein the extraction agent is organic matter which is insoluble or slightly soluble in water and is lower than the hydrazine hydrate in boiling point, and the volume ratio of the rough hydrazine hydrate to the extraction agent is 1:2-5; the hydrazine hydrate obtained after extraction is completed is fed for rectification so that the organic impurities can be removed. By means of the method, a large amount of organic matter in hydrazine hydrate, especially organic matter which cannot be easily removed by other methods and has a boiling point similar to that of hydrazine hydrate is removed. The method is simple and easy to implement, equipment input is small, and energy consumption is low; used extraction agents can be recycled, so that the operation cost is reduced.

Description

technical field [0001] The invention relates to the technical field of removing organic matter, in particular to a method for removing organic matter in hydrazine hydrate. 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 constantly expanding in recent years. The production methods of hydrazine hydrate mainly include Raschig method, urea method, ketazine method, hydrogen peroxide method and air oxidation method. T...

Claims

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Application Information

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IPC IPC(8): C01B21/16
Inventor 万立周明柴进祥陈尚思张进萍
Owner YIBIN HAIFENG HERUI
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