Regeneration treatment method of hydrazine hydrate hydrochloride

A technology of hydrazine hydrate hydrochloride and a treatment method, which is applied in the field of hydrazine hydrate hydrochloride regeneration, can solve the problems of high cost, high impurity content and cannot be used, achieves improved efficiency, reduced solid waste treatment cost and raw material cost, The effect of low equipment investment

Pending Publication Date: 2021-11-19
陕西大美化工科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, hydrazine hydrate hydrochloride with too many cycles cannot be used due to high impurity content, so it can only be replaced with hydrazine hydrate or treated as solid waste by a third-party organization, but the cost of both treatment methods is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Dissolve 300g of the raw material hydrazine hydrate hydrochloride in 300mL of water, slowly add 1500mL of acetonitrile to it under stirring condition, then continue to stir for 10 minutes, filter with suction, and vacuum the solid material obtained by suction filtration at 90°C After drying for 8 hours, 240 g of regenerated hydrazine hydrate hydrochloride was obtained with a purity of 99.5% and a yield of 93.6%.

Embodiment 2

[0022] Dissolve 300g of the raw material hydrazine hydrate hydrochloride in 300mL of water, slowly add 1500mL of methanol to it under stirring condition, then continue to stir for 10 minutes, filter with suction, and vacuum the solid material obtained by suction filtration at 90°C After drying for 8 hours, 238 grams of regenerated hydrazine hydrate hydrochloride was obtained, with a purity of 99.1% and a yield of 92.5%.

Embodiment 3

[0024] Dissolve 300g of the raw material hydrazine hydrate hydrochloride in 300mL of water, slowly add 1500mL of ethanol to it under stirring condition, then continue to stir for 10 minutes, filter with suction, and vacuum the solid material obtained by suction filtration at 90°C After drying for 8 hours, 242 grams of regenerated hydrazine hydrate hydrochloride was obtained, with a purity of 99.2% and a yield of 94.1%.

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Abstract

The invention discloses a regeneration treatment method of hydrazine hydrate hydrochloride. The method comprises the following steps of: (1) when the purity of hydrazine hydrate hydrochloride is lower than 90%, collecting the hydrazine hydrate hydrochloride; and (2) dissolving the collected hydrazine hydrate hydrochloride in water, adding a polar solvent into the solution under a stirring condition, then performing continuous stirring for 10-30 minutes, carrying out solid-liquid separation, and drying a separated solid to obtain the regenerated hydrazine hydrate hydrochloride. According to the method, the polar solvent is added into the hydrazine hydrate hydrochloride aqueous solution to destroy the solubility balance so as to separate out hydrazine hydrate hydrochloride crystals; and the purpose of removing impurities is achieved through the solid-liquid separation technology. The method is simple in operation and low in equipment investment, and reduces solid waste treatment cost and raw material cost; the purity of the obtained regenerated hydrazine hydrate hydrochloride is 99-99.8%, the purpose of regeneration treatment of the hydrazine hydrate hydrochloride is effectively achieved, and the recycling efficiency of the hydrazine hydrate hydrochloride is improved.

Description

technical field [0001] The invention belongs to the technical field of regeneration of hydrazine hydrate hydrochloride, and in particular relates to a regeneration treatment method of hydrazine hydrate hydrochloride. Background technique [0002] Hydrazine hydrate hydrochloride is an intermediate product in the process of producing methylhydrazine using the hydrazine hydrate method. It can undergo an alkylation reaction with methanol under specific conditions to obtain methylhydrazine hydrochloride to further obtain methylhydrazine, which can be recycled many times. However, as the number of cycles increases, the impurities contained in it gradually increase, among which impurities such as iron, p-dimethylhydrazine, and trimethylhydrazine are the most prominent, and contain mechanical impurities entrained in raw materials. These impurities affect its recycling rate. , reduce the efficiency of generating methylhydrazine; it is necessary to regenerate the intermediate product ...

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 何宇原晓艳王凯陈磊周扬
Owner 陕西大美化工科技有限公司
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