Method for preparing maleichydrazide

A technology of maleic hydrazide and hydrazine hydrate, applied in the direction of organic chemistry, etc., can solve the problems of high residual hydrazine of maleic hydrazide, difficulty in meeting the requirements of the international market, incomplete reaction, etc., and achieve low cost and high quality , Reasonable effect of synthetic process
CN101735154AInactive Publication Date: 2010-06-16亚邦投资控股集团有限公司
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
亚邦投资控股集团有限公司
Publication Date
2010-06-16
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a method for preparing maleichydrazide of a plant growth inhibitor, which is characterized by comprising the following steps of: reacting concentrated sulfuric acid with hydrazine hydrate to form a hydrazine sulfate aqueous solution; then adding organic aromatic acid as a catalyzer to react with maleic anhydride under refluxing under the condition of temperature rise; adding inorganic base to neutralize until the pH is 5.0-7.0; and rinsing with water at room temperature to remove hydrazine residues to obtain the maleichydrazide. The invention has safe and convenient operation and high yield, and the product quality meets the international standards, and thereby, the invention is extremely suitable for industrial production.
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Description

technical field

[0001] The invention relates to a preparation method of maleic hydrazide, a selective and temporary plant growth inhibitor. Background technique

[0002] Maleic hydrazide, referred to as MH, also known as Yiyadan, the chemical name is maleic hydrazide, which is a selective and temporary plant growth inhibitor. The agent can enter the plant through the cuticle of the leaf and can inhibit the Cell division and reduction of light and action, thereby strongly inhibiting the formation of buds and stem growth, improving cold resistance, and inhibiting the growth of tobacco axillary buds and the germination of potatoes, potatoes, onions, etc. during storage.

[0003] At present, the process route for synthesizing maleic hydrazide is mainly prepared by reacting maleic anhydride and hydrazine hydrate in solvents such as water, ethanol, acetic acid and sulfuric acid respectively.

[0004]

[0005] Considering the yield and manufacturing cost, sulfuric acid is mostl...

Claims

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