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
CN104086362AInactive Publication Date: 2014-10-08潍坊蓝海环境保护有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
潍坊蓝海环境保护有限公司
Publication Date
2014-10-08
Estimated Expiration
Not applicable · inactive patent

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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.
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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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