Check patentability & draft patents in minutes with Patsnap Eureka AI!

Preparation method of 42% methylhydrazine aqueous solution

A technology of methylhydrazine and aqueous solution, which is applied in the field of chemical distillation, can solve the problems of large heat consumption, high content of methylhydrazine in wastewater, and high production costs, and achieve the effect of low energy consumption for separation

Active Publication Date: 2015-05-20
XIAN MODERN CHEM RES INST
View PDF3 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the implementation process of the prior art, there are the following problems: (1) the refining process needs to evaporate a large amount of water, consume a large amount of heat, and the production cost is high; (2) the content of methylhydrazine in the wastewater produced by the refining process exceeds 0.2%, and the wastewater High content of methylhydrazine

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation method of 42% methylhydrazine aqueous solution
  • Preparation method of 42% methylhydrazine aqueous solution
  • Preparation method of 42% methylhydrazine aqueous solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] according to figure 1 The process flow diagram shown implements the present invention, and the raw material flow S1 of 3043kg / h that temperature is 50 ℃ is sent into the middle part of the first rectifying tower T1 tower, raw material composition: water, 97.63%; Methylhydrazine: 2.37%.

[0027] The first rectification tower T1 is operated at 300kPa, the reflux ratio is 1, the top of the T1 tower is produced as water, the temperature at the top of the tower is 133°C, the bottom of the T1 tower is concentrated liquid of methylhydrazine, and the temperature of the bottom of the tower is 134°C; The second rectification tower T2 operates at 100kPa, the reflux ratio is 3, the top of the T2 tower is produced as water, the temperature at the top of the tower is 99 ° C, and the T2 tower is produced as a methylhydrazine aqueous solution with a mass fraction of 42.59% of methylhydrazine. The temperature of the tower kettle is 105°C. The logistics composition in Example 1 is shown...

Embodiment 2

[0035] according to figure 1 The process flow diagram shown implements the present invention, and the raw material flow S1 of 3043kg / h that temperature is 50 ℃ is sent into the middle part of the first rectifying tower T1 tower, raw material composition: water, 98.0%; Methylhydrazine: 2.0%.

[0036] The first rectification tower T1 is operated at 400kPa, the reflux ratio is 1, the top of the T1 tower is produced as water, and the temperature at the top of the tower is 143°C, and the output from the bottom of the T1 tower is methylhydrazine concentrate, and the temperature of the bottom of the tower is 144°C ; The second rectification tower T2 operates at 200kPa, the reflux ratio is 3, the top of the T2 tower is produced as water, and the temperature at the top of the tower is 120°C; the production of the T1 tower is methylhydrazine with a mass fraction of 42.09% of methylhydrazine Aqueous solution, the temperature of the tower kettle is 126°C.

[0037] In order to embody the ...

Embodiment 3

[0044] according to figure 1 The process flow sheet shown implements the present invention, and the temperature is that the raw material flow S1 of 3043kg / h of 50 ℃ is sent into the middle part of the first rectifying tower T1 tower, raw material composition: water, 97.5%; Methylhydrazine: 2.5%.

[0045] The first rectification tower T1 is operated at 400kPa, the reflux ratio is 1, the top of the T1 tower is produced as water, and the temperature at the top of the tower is 143°C, and the output from the bottom of the T1 tower is methylhydrazine concentrate, and the temperature of the bottom of the tower is 144°C ; The second rectification tower T2 is operated at 100kPa, the reflux ratio is 3, the top of the T2 tower is produced as water, and the temperature at the top of the tower is 99°C; the production of the T1 tower is methylhydrazine with a mass fraction of 42.49%. Aqueous solution, the temperature of the tower kettle is 105°C.

[0046] In order to embody the advantages ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
quality scoreaaaaaaaaaa
Login to View More

Abstract

The invention discloses a preparation method of 42% methylhydrazine aqueous solution. The invention mainly solves the problems that the dilute methylhydrazine aqueous solution rectified and refined in the prior art is high in separation energy consumption, and the waste water is high in methylhydrazine content. The preparation method comprises the following steps: by using dilute methylhydrazine aqueous solution as raw material, using a first rectifying tower and a second rectifying tower in different pressures, wherein the first rectifying tower is a high-pressure tower, and the second rectifying tower is a low-pressure tower; (1) feeding the raw materials into the first rectifying tower to rectify, wherein the overhead fraction is water, and the tower pot fraction is methylhydrazine concentrated solution; (2) feeding the methylhydrazine concentrated solution into the second rectifying tower to rectify, wherein the overhead fraction is water, and the tower pot fraction is the methylhydrazine aqueous solution with mass percent of 42%. The method disclosed by the invention is used for preparing the 42% methylhydrazine aqueous solution.

Description

technical field [0001] The invention belongs to the technical field of chemical distillation, and in particular relates to a preparation method of a 42% methylhydrazine aqueous solution. Background technique [0002] The 42% aqueous solution of methylhydrazine is an important chemical product, which is widely used in the fields of medicine, chemical industry, biochemical industry and pesticide. The chloramine method is the earliest method for producing methylhydrazine in industry, and it is also the most mature method. During the implementation of the chloramine method in industry, it is usually necessary to refine a dilute methylhydrazine aqueous solution with a mass concentration of about 2% through a conventional rectification process to obtain a 42% methylhydrazine aqueous solution product. In the implementation process of the prior art, there are the following problems: (1) the refining process needs to evaporate a large amount of water, consume a large amount of heat,...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C07C243/14C07C241/02
Inventor 袁俊杨建明吕剑张前王伟余秦伟梅苏宁赵锋伟惠丰王为强李亚妮谷玉杰万洪
Owner XIAN MODERN CHEM RES INST
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com