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Preparation method of hydrazine sulfate

A technology of hydrazine sulfate and hydrazine salt, which is applied in the direction of hydrazine, nitrogen and non-metallic compounds, can solve the problems of unsatisfactory purity of hydrazine sulfate, and achieve the effect of simple process

Inactive Publication Date: 2017-11-24
盐城顺恒化工有限公司
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AI Technical Summary

Problems solved by technology

The purity of the hydrazine sulfate obtained in the existing process is often not ideal

Method used

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Embodiment Construction

[0022] The best mode for carrying out the present invention is described below.

[0023] A kind of preparation method of hydrazine sulfate of present embodiment 1, comprises the steps:

[0024] S1, using butanone and ammonia as raw materials, using air as oxidant, using PdCl 2 and CuCl 2 As a catalyst, formamide and sodium bromide are used as cocatalysts to synthesize butanoneazine;

[0025] S2. Separating the upper oil phase containing butanoneazine from the water phase containing the catalyst; concentrating the water phase containing the catalyst and recycling it for use in step S1;

[0026] S3, the separated oil phase is adjusted to a pH value of 1-4 with an acid, and azine butanone is acid-hydrolyzed into hydrazine salt and butanone; butanone is distilled and recovered for use in step S1;

[0027] S4, the pH value of the solution containing hydrazine salt is adjusted to 9-12, the hydrazine salt is neutralized by alkali to generate hydrazine hydrate, all the hydrazine hy...

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PUM

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Abstract

The invention provides a preparation method of hydrazine sulfate and relates to a preparation method of a chemical reagent. The method comprises the following steps: taking butanone and ammonia as raw materials and air as an oxidizing agent and synthesizing butazone by using PdC12 and CuC12 as catalysts, and formamide and sodium bromide as co-catalysts; synthesizing hydrazine hydrate by utilizing the butazone; finally adding concentrated sulfuric acid into the hydrazine hydrate to prepare the hydrazine sulfate. The hydrazine sulfate prepared by the preparation method provided by the invention is high in purity.

Description

technical field [0001] The present invention relates to the preparation method of chemical reagent, be specifically related to a kind of preparation method of hydrazine sulfate. Background technique [0002] Hydrazine sulfate (N 2 h 4 ·H 2 SO 4 ) also known as hydrazine sulfate, toxic, its pure product is colorless squamous crystals or orthorhombic crystals, odorless, easily soluble in hot water, less soluble in cold water, stable in the air, easily affected by alkali or oxidant, Weak moisture absorption, strong reducing effect. [0003] Hydrazine sulfate has a wide range of uses. It is used in the manufacture of isoniazid, anhydrous hydrazine, hydrazine and nitrofurazone in medicine; it is used in the manufacture of azodicarbonamide and azobisisobutyronitrile in dyes; it is used in insecticide in agriculture. Agent, sterilant, malic acid hydrazine, plant growth inhibitor; it can be used as a foaming agent for plastics and rubber, and it can also be used for analytical ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B21/16
CPCC01B21/16C01P2006/80
Inventor 田其雄刘昌奎李加华刘龙龙
Owner 盐城顺恒化工有限公司
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