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Method for recycling organic solvents of wastewater generated in synthesis of hydrazine hydrate by ketazine method

A ketazine method and organic solvent technology, applied in the field of organic solvent recovery, can solve problems such as difficulty in meeting harmless discharge standards, insufficient recycling, environmental pollution, etc., to solve the problem of excessive organic components and easy automatic control , the effect of solving environmental pollution problems

Inactive Publication Date: 2014-10-08
潍坊蓝海环境保护有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] At present, domestic enterprises mostly use physical or chemical methods to simply extract salt, but the organic components in it are not fully recycled, which not only makes it difficult to meet the harmless discharge standards, but also brings serious pollution to the environment. waste

Method used

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  • Method for recycling organic solvents of wastewater generated in synthesis of hydrazine hydrate by ketazine method

Examples

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Effect test

preparation example Construction

[0057] 4. The preparation steps of isopropanol:

[0058] Add 10-12% mass percent of caustic soda (the weight ratio of the azeotrope) to the isopropanol-water binary azeotrope. After stirring and fully dissolving, the solution is layered, and the upper layer is 0.3-0.5% water content. Isopropanol, the lower layer is sodium hydroxide aqueous solution, and the upper layer solution is distilled to obtain a colorless and transparent isopropanol product with a purity of 99.0%.

Embodiment 1

[0060] Such as figure 1 Shown, a kind of recovery method of organic solvent in ketazine method hydrazine hydrate waste water, comprises the following steps:

[0061] Put 7020kg of ketazine method hydrazine hydrate wastewater with a temperature of 0°C-15°C into the reaction conversion kettle through a centrifugal pump, open the drip valve at the bottom of the sulfuric acid high level tank, pass through the rotameter, control the flow rate to 80L / h, and slowly 770Kg of sulfuric acid with a concentration of 93% is added dropwise to the reactor, the amount of pure sulfuric acid added is 10.2% of the mass percentage of the waste water, and the temperature of the liquid in the reactor is controlled at 0-20°C. Turn on the electric stirring to make the materials react evenly. After 30 minutes, a large amount of hydrazine sulfate is formed and precipitated in the kettle. Open the valve at the bottom of the kettle to let the solution enter the centrifuge, start the circulation pump butt...

Embodiment 2

[0065] Example 2, such as figure 1 Shown, a kind of recovery method of organic solvent in ketazine method hydrazine hydrate waste water, comprises the following steps:

[0066] Put 8640kg of ketazine method hydrazine hydrate wastewater with a temperature of 0°C-15°C into the reaction conversion kettle through a centrifugal pump, open the drip valve at the bottom of the sulfuric acid high level tank, and pass through the rotameter to control the flow rate to 80L / h, slowly Add 900 kg of sulfuric acid with a concentration of 98% to the reaction kettle dropwise, the amount of pure sulfuric acid added is 10.2% of the mass percentage of the waste water, and the temperature of the liquid in the reaction kettle is controlled at 0-20°C. Turn on the electric stirring to make the materials react evenly. After 40 minutes, a large amount of hydrazine sulfate is formed and precipitated in the kettle. Open the valve at the bottom of the kettle to let the solution enter the centrifuge, start ...

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Abstract

The invention relates to a method for extracting organic solvents and hydrazine sulfate from wastewater generated in synthesis of hydrazine hydrate by a ketazine method. The method comprises the following steps: converting, purifying hydrazine sulfate, rectifying and preparing isopropanol, wherein the step of conversion comprises the following steps: slowly dropping sulfuric acid into a hydrazine hydrate wastewater solution under the condition of 0-15 DEG C so as to precipitate and separate out hydrazine sulfate from the solution, and performing centrifugal filtration to obtain a crude hydrazine sulfate product; the step of purifying hydrazine sulfate comprises the following steps: filtering the crude hydrazine sulfate product, washing for 2-3 times by using cold water, and performing centrifugal filtration and drying crystallization so as to obtain a pure hydrazine sulfate product; the step of rectifying comprises the following steps: collecting filtrate and a washing liquid, feeding into a rectifying tower, rectifying when the tower top temperature is 55-56 DEG C so as to collect a pure acetone product, and rectifying when the tower top temperature is 80-82 DEG C so as to collect binary azeotrope of isopropanol-water; the step of preparing isopropanol comprises the following steps: dehydrating the binary azeotrope of isopropanol-water by using caustic soda flakes, and subsequently distilling, thereby obtaining a pure isopropanol product.

Description

technical field [0001] The invention relates to a method for recovering organic solvents in the field of hazardous waste disposal industry, more specifically, relates to a method for extracting hydrazine sulfate and organic solvents from hydrazine hydrate wastewater by ketazine method. Background technique [0002] Hydrazine hydrate, also known as hydrazine hydrate, chemical formula: N 2 h 4 ·H 2 O, is a fine chemical product. Hydrazine hydrate is a colorless and transparent oily liquid with a light ammonia smell, smokes in humid air, has strong alkalinity and hygroscopicity, boiling point 118.5°C; fire point 73°C; relative density 1.032; can be mixed with water and alcohol at will; Insoluble in ether and chloroform. It is permeable and corrosive, and can attack glass, rubber, leather and cork. Contact with oxidants will cause spontaneous combustion, self-explosion, poisonous and odorous. Hydrazine hydrate and its derivatives are widely used in many industrial applicat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C27/26C07C27/00C07C29/09C07C29/76C07C31/10C07C45/85C07C49/08C01B21/16
CPCC07C29/09C01B21/16C07C29/76C07C45/85C07C49/08C07C31/10
Inventor 赵小云熊激光郭学阳韩光坤刘倩李庆韩豪朱浩慧杨荣华孙春辉
Owner 潍坊蓝海环境保护有限公司
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