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Preparation method of maleic hydrazide

A technology of maleic hydrazide and hydrazine hydrate, which is applied in chemical instruments and methods, physical/chemical process catalysts, organic chemistry, etc., can solve the problems of large waste discharge, difficulty in wastewater treatment, and high treatment costs, and achieve waste disposal. The effect of low emission, good catalytic effect and low production cost

Inactive Publication Date: 2018-08-17
重庆锦杉科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For every ton of maleic hydrazide produced by this production process, 4 to 5 tons of acidic organic wastewater will be produced. The treatment of wastewater requires a large amount of alkali neutralization. The salt content and COD content in wastewater are high, and wastewater treatment is difficult and expensive. High, which brings great pressure on the production cost of the enterprise. Due to the large amount of waste discharge, the traditional production process is easy to cause environmental pollution

Method used

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  • Preparation method of maleic hydrazide

Examples

Experimental program
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Effect test

Embodiment 1

[0011] With 200g of maleic anhydride, 250g of hydrazine hydrate and ZnCl with a content of 80% 2 / CuCl 2 Put 20g of the composite catalyst in a four-necked flask with stirring, thermometer and rectification column, start the stirring, heat up to reflux, when the steam enters the rectification column, extract water vapor at the column top temperature of 98°C to 100°C, and in the reflux React at high temperature for 4 to 6 hours. When there is no condensed water flowing out from the top of the rectifying column, the reaction is ended. Use vacuum distillation to distill all the remaining hydrazine hydrate in the flask, then cool the flask to normal temperature, add an appropriate amount of pure water, and start stirring , after the solid matter in the flask is stirred into a slurry, it is put into a centrifugal filter to filter, and then the filter cake is washed with an appropriate amount of pure water, and the washed filter cake is centrifugally dehydrated and dried to obtain 2...

Embodiment 2

[0013] Maleic anhydride 200g, hydrazine hydrate 280g and ZnCl with a content of 90% 2 / CuCl 2 Put 30g of composite catalyst in a four-neck flask with stirring, thermometer and rectification column, start stirring, heat up to reflux, when the steam enters the rectification column, extract water vapor at the column top temperature of 98°C to 100°C, and in the reflux React at high temperature for 4 to 6 hours. When there is no condensed water flowing out from the top of the rectifying column, the reaction is ended. Use vacuum distillation to distill all the remaining hydrazine hydrate in the flask, then cool the flask to normal temperature, add an appropriate amount of pure water, and start stirring , after the solid matter in the flask is stirred into a slurry, put it into a centrifugal filter to filter, then wash the filter cake with an appropriate amount of pure water, and the washed filter cake obtains 221.4 g of maleic hydrazide through centrifugal dehydration and drying.

Embodiment 3

[0015] Maleic anhydride 200g, hydrazine hydrate 300g and ZnCl with a content of 99% 2 / CuCl 2 Put 40g of the composite catalyst in a four-neck flask with stirring, thermometer and rectification column, start the stirring, heat up to reflux, when the steam enters the rectification column, extract water vapor at the column top temperature of 98°C to 100°C, and in the reflux React at high temperature for 4 to 6 hours. When there is no condensed water flowing out from the top of the rectifying column, the reaction is ended. Use vacuum distillation to distill all the remaining hydrazine hydrate in the flask, then cool the flask to normal temperature, add an appropriate amount of pure water, and start stirring After the solid matter in the flask is stirred into a slurry, put it into a centrifugal filter and filter, then wash the filter cake with an appropriate amount of pure water, and the washed filter cake obtains 223.6 g of maleic hydrazide through centrifugal dehydration and dry...

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Abstract

The invention provides a preparation method of maleic hydrazide. The method includes: using maleic anhydride and hydrazine hydrate as raw materials; adopting a ZnCl2 / CuCl2 composite catalyst for cyclization reaction at certain temperature to obtain maleic hydrazide. Hydrazine hydrate is maintained excessive in a reaction system, and water generated by reaction is constantly separated out of the reaction system, so that hydrazide reaction is promoted effectively, reaction time is reduced, and reaction yield is increased. Compared with the prior art, the preparation method has the advantages that the ZnCl2 / CuCl2 composite catalyst is adopted to prepare maleic hydrazide, thereby being good in catalysis effect, high in reaction yield, easy to recycle and reusable, and the preparation method islow in production cost, free of generating acidic wastewater and salt-containing organic wastewater, little in waste emission and environment-friendly.

Description

technical field [0001] The invention belongs to the technical field of chemical synthesis, and in particular relates to a preparation method of maleic hydrazide. Background technique [0002] Maleic hydrazide, also known as maleic hydrazide, is a white crystalline solid, hardly soluble in water, easily soluble in organic solvents, is a plant growth regulator, and also has a variety of biological activities, used for selective weeding agents and temporary plant growth inhibitors. The medicament can enter the plant through the cuticle of the leaf surface, reduce photosynthesis, osmotic pressure and evaporation, and can strongly inhibit the growth of buds. It is used to prevent the germination of potato tubers, onions, garlic, radishes, etc. during storage, and has the effect of inhibiting the growth of crops and prolonging flowering. It can also be used as a herbicide or chemical topping for tobacco, as well as bactericidal and antiviral effects. [0003] The traditional ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D237/16B01J27/138
CPCC07D237/16B01J27/138
Inventor 不公告发明人
Owner 重庆锦杉科技有限公司
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