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Synthetic method of maleic hydrazide

A technology of maleic hydrazide and its synthesis method, which is applied in the field of maleic hydrazide synthesis, can solve the problems of large waste discharge, difficult wastewater treatment, high treatment cost, etc., achieve less waste discharge, good catalytic effect, The effect of low production cost

Inactive Publication Date: 2018-07-20
重庆丽澄环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Synthetic method of maleic hydrazide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] 200g of maleic anhydride, 250g of hydrazine hydrate with a content of 80%, and 20g of sodium 2,6-dimethylphenylborate are placed in a four-necked flask with stirring, a thermometer and a rectifying column, and the stirring is started, and the temperature is raised to Reflux, when the steam enters the rectification column, extract water vapor at the column top temperature of 95 ° C ~ 100 ° C, react at the reflux temperature for 4 to 6 hours, and end the reaction when no condensed water flows out from the top of the rectification column, and use vacuum distillation Evaporate all the remaining hydrazine hydrate in the flask, then cool the flask to normal temperature, add an appropriate amount of pure water, start stirring, when the solid matter in the flask is stirred into a slurry, put it into a centrifugal filter to filter, and then use an appropriate amount of pure water The filter cake was washed with water, and the washed filter cake was centrifugally dehydrated and dr...

Embodiment 2

[0013] Put 200 g of maleic anhydride, 280 g of hydrazine hydrate with a content of 90%, and 30 g of sodium 2,6-dimethylphenylborate in a four-necked flask with stirring, a thermometer and a rectifying column, start stirring, and heat up to Reflux, when the steam enters the rectification column, extract water vapor at the column top temperature of 95 ° C ~ 100 ° C, react at the reflux temperature for 4 to 6 hours, and end the reaction when no condensed water flows out from the top of the rectification column, and use vacuum distillation Evaporate all the remaining hydrazine hydrate in the flask, then cool the flask to normal temperature, add an appropriate amount of pure water, start stirring, when the solid matter in the flask is stirred into a slurry, put it into a centrifugal filter to filter, and then use an appropriate amount of pure water The filter cake was washed with water, and the washed filter cake was centrifugally dehydrated and dried to obtain 220.7 g of maleic hyd...

Embodiment 3

[0015] Put 200g of maleic anhydride, 300g of hydrazine hydrate with a content of 99%, and 40g of sodium 2,6-dimethylphenylborate in a four-necked flask with stirring, a thermometer and a rectifying column, start stirring, and heat up to Reflux, when the steam enters the rectification column, extract water vapor at the column top temperature of 95 ° C ~ 100 ° C, react at the reflux temperature for 4 to 6 hours, and end the reaction when no condensed water flows out from the top of the rectification column, and use vacuum distillation Evaporate all the remaining hydrazine hydrate in the flask, then cool the flask to normal temperature, add an appropriate amount of pure water, start stirring, when the solid matter in the flask is stirred into a slurry, put it into a centrifugal filter to filter, and then use an appropriate amount of pure water The filter cake was washed with water, and the washed filter cake was centrifugally dehydrated and dried to obtain 223.5 g of maleic hydraz...

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Abstract

The invention provides a synthetic method of maleic hydrazide. The method comprises the following steps: by taking maleic anhydride and hydrazine hydrate as raw materials, and using 2,6-dimethylphenylboronic acid sodium as a catalyst, performing cyclization reaction at certain temperature to obtain the maleic hydrazide. The overdose hydrazine hydrate is kept in a reaction system, water generatedby reaction is separated out of the reaction system continuously, hydrazide reaction is effectively promoted to be performed, the reaction time is shortened, and the reaction yield is improved. Compared with the prior art, the 2,6-dimethylphenyl boronic acid sodium is adopted to serve as a catalyst to synthesize the maleic hydrazide, and has a good catalytic effect, the reaction yield is high, thecatalyst is east to recycle and can be repeatedly used, the production cost is low, acid wastewater and saliferous organic wastewater are not generated, and less waste is discharged, so the syntheticmethod is a green and environment-friendly production process.

Description

technical field [0001] The invention belongs to the technical field of chemical synthesis, and in particular relates to a synthetic 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 male...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D237/16
CPCY02P20/584C07D237/16
Inventor 不公告发明人
Owner 重庆丽澄环保科技有限公司
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