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Method for preparing high-concentration hydrazine hydrate

A hydrazine hydrate, high-concentration technology, applied in the chemical field of azeotropic distillation, can solve the problems of high equipment requirements, cumbersome operation, large energy consumption, etc., and achieve the effects of increasing the concentration of hydrazine hydrate, increasing the concentration, and reducing the requirements of production equipment

Inactive Publication Date: 2016-01-20
YIBIN HAIFENG HERUI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Therefore, the purpose of the present invention is to overcome the defects of high temperature, high equipment requirements, large energy consumption and cumbersome operation in the prior art to solve the above problems

Method used

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  • Method for preparing high-concentration hydrazine hydrate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Add 800g of 80% hydrazine hydrate and 100ml of toluene into a 1L three-neck flask, use a rectification device consisting of a 500mm thorn-type distillation column, a spherical condenser, and a layerer to conduct heating, and control the temperature in the flask to 118°C~120°C to control the distillation The temperature at the top of the column is 100°C~102°C. After the gas is condensed, it enters the stratifier. The upper layer of toluene overflows into the dropping funnel and is added to the three-necked flask. The water containing hydrazine hydrate in the lower layer enters the collection bottle. Constantly taken out by the entrainer, hydrazine hydrate and water are separated, and the hydrazine hydrate concentration is getting higher and higher. When there is almost no water in the distillate, the test is stopped, and the hydrazine hydrate content is analyzed after cooling to obtain 99.5% hydrazine hydrate 513g.

Embodiment 2

[0021] Add 800g of 80% hydrazine hydrate and 190ml of toluene into a 1L three-neck flask, use a rectification device consisting of a 500mm thorn-shaped distillation column, a spherical condenser, and a layerer to conduct heating, control the temperature in the flask to 118°C~120°C, and control the distillation The temperature at the top of the column is 100°C~102°C. After the gas is condensed, it enters the stratifier. The upper layer of toluene overflows into the dropping funnel and is added to the three-necked flask. The water containing hydrazine hydrate in the lower layer enters the collection bottle. Constantly taken out by the entrainer, hydrazine hydrate and water are separated, and the concentration of hydrazine hydrate is getting higher and higher. When there is almost no water in the distillate, the test is stopped. After cooling, the hydrazine hydrate content is analyzed to obtain 99.7% hydrazine hydrate 516g.

Embodiment 3

[0023] Add 800g of 60% hydrazine hydrate and 80ml of aniline into a 1L three-neck flask, use a rectification device consisting of a 500mm thorn-shaped distillation column, a spherical condenser, and a stratifier to conduct heating, and control the temperature in the flask to 118°C~120°C to control the distillation. The temperature at the top of the column is 100°C~102°C. After the gas is condensed, it enters the stratifier. The upper layer of toluene overflows into the dropping funnel and is added to the three-necked flask. The water containing hydrazine hydrate in the lower layer enters the collection bottle. Constantly taken out by the entrainer, hydrazine hydrate and water are separated, and the hydrazine hydrate concentration is getting higher and higher. When there is almost no water in the distillate, the test is stopped, and the hydrazine hydrate content is analyzed after cooling to obtain 99.3% hydrazine hydrate 510g.

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Abstract

The invention provides a method for preparing high-concentration hydrazine hydrate. Entrainer is added in a solution of the hydrazine hydrate, azeotropic distillation is conducted at normal pressure, an azeotropic mixture is formed through water and the entrainer, the boiling point of the azeotropic mixture is lower, the temperature of distillation is reduced, the entrainer continuously brings out water in the solution, the hydrazine hydrate concentration is increased constantly, selected entrainer is not dissolved in the water or slightly dissolved in the water, the entrainer can be layered with the water, and the entrainer is separated and can be recycled. The method for preparing the high-concentration hydrazine hydrate is simple, convenient, efficient and low in cost, the purpose of preparing the high-concentration hydrazine hydrate is achieved, and certain application value is achieved.

Description

technical field [0001] The invention relates to the technical field of azeotropic distillation chemical industry, in particular to a method for adding an azeotropic agent, azeotropic distillation, and increasing the concentration of hydrazine hydrate. Background technique [0002] Hydrazine hydrate, also known as hydrazine hydrate, is a colorless and transparent oily liquid with a faint ammonia smell and smokes in the air, with strong polarity and weak alkalinity. The freezing point is -51.7°C and the boiling point is 118.5°C. Hydrazine hydrate and its derivatives are often used as insecticides, herbicides, plant production regulators, foaming agents, and reducing agents in the fields of agriculture, electronics, medicine, photography, dyes, and polymers. In addition, hydrazine is also commonly used in boiler cleaning agent and oxygen scavenger, so hydrazine is a widely used chemical product. [0003] The concentration of commercially available hydrazine hydrate is general...

Claims

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Application Information

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IPC IPC(8): C07C241/02C07C243/10
Inventor 罗云邓敏万立尹健周明柴进祥金永奎陈尚思
Owner YIBIN HAIFENG HERUI
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