Supercharge Your Innovation With Domain-Expert AI Agents!

Production process for synthesizing o-dibromobenzene

A technology of ortho-dibromobenzene and production process, which is applied in the field of production technology for ortho-dibromobenzene synthesis, can solve the problems of low yield, complicated production process and low purity, and achieves high purity, easily available raw materials, and convenient and simple preparation. Effect

Inactive Publication Date: 2014-10-08
安徽佑骏商品混凝土有限公司
View PDF0 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] o-dibromobenzene, colorless or light yellow liquid, relative density 1.9560, refractive index 1.6155, soluble in ethanol, easily soluble in ether, acetone, benzene and carbon tetrachloride, insoluble in water, flash point 91°C, used in or

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A production process for the synthesis of o-dibromobenzene, comprising the following process steps,

[0021] a. take by weighing 170kg of o-bromoaniline and 400kg of 50% sodium hydroxide.

[0022] b. Put o-bromoaniline and 50% sodium hydroxide into the enamel reaction kettle, turn on the stirring device, and continuously add ice cubes into the enamel reaction kettle until the temperature is 0°C.

[0023] c. Weigh 68kg of sodium nitrite and 120kg of water to make a solution.

[0024] d. Continue to stir the mixture in the enamel reactor and add the solution prepared in step c, and continue to add ice cubes until the temperature is below 10°C.

[0025] e. When excessive nitrous acid is produced in the enamel reaction kettle, stop the reaction to the heavy ammonium salt solution, and take out the heavy ammonium salt solution for later use.

[0026] f. take by weighing 78kg cuprous bromide and 95kg50% hydrobromic acid to form a solution.

[0027] g. Heat the solution in ...

Embodiment 2

[0032] A production process for the synthesis of o-dibromobenzene, comprising the following process steps,

[0033] a. take by weighing 171.9kg of o-bromoaniline and 405kg of 50% sodium hydroxide.

[0034] b. Put o-bromoaniline and 50% sodium hydroxide into the enamel reaction kettle, turn on the stirring device, and continuously add ice cubes into the enamel reaction kettle until the temperature is 0°C.

[0035] c. Weigh 69kg of sodium nitrite and 125kg of water to make a solution.

[0036] d. Continue to stir the mixture in the enamel reactor and add the solution prepared in step c, and continue to add ice cubes until the temperature is below 10°C.

[0037] e. When excessive nitrous acid is produced in the enamel reaction kettle, stop the reaction to the heavy ammonium salt solution, and take out the heavy ammonium salt solution for later use.

[0038] f. take by weighing 79kg cuprous bromide and 97kg50% hydrobromic acid to form a solution.

[0039] g. The solution in the...

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

No PUM Login to View More

Abstract

The invention discloses a production process for synthesizing o-dibromobenzene, and relates to the technical field of chemical industry. The production process comprises the following steps: putting o-bromoamino and 50 percent sodium hydroxide into a reaction kettle; starting a stirring device; continuously adding ice blocks into the reaction kettle till the temperature is 0 DEG C; weighing sodium nitrite and water, and preparing into a solution; continually stirring the mixture in the reaction kettle, and adding the prepared solution; controlling the temperature below 10 DEG C to obtain a heavy ammonium salt solution, and taking the heavy ammonium salt solution out for later use; weighing copper bromide and 50 percent hydrobromic acid, and preparing into a solution; heating till boiling; adding the heavy ammonium salt solution; introducing water vapor for distilling; separating a lower oil layer out; washing till the pH of the solution is 7; drying; distilling; collecting the obtained mixture at 223-225 DEG C to obtain o-dibromobenzene; and packaging and warehousing. The production process has the beneficial effects of convenience and easiness in preparation, environmental friendliness, freeness from pollution, adoption of readily-available raw materials, small equipment investment, high purity and convenience in operation; and prepared bromobenzene has a good use effect, and is safe and reliable.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a production process for the synthesis of o-dibromobenzene. Background technique [0002] o-dibromobenzene, colorless or light yellow liquid, relative density 1.9560, refractive index 1.6155, soluble in ethanol, easily soluble in ether, acetone, benzene and carbon tetrachloride, insoluble in water, flash point 91°C, used in organic In the field of synthesis, dye intermediates and other fields, there are problems such as low yield and low purity in the current industrial production, and the production process is relatively complicated, which is difficult to meet the needs of human beings. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a production process for the synthesis of o-dibromobenzene with high purity and simple preparation process. [0004] The technical problem to be solved by the present inventio...

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
IPC IPC(8): C07C25/02C07C17/093
Inventor 刘超金士明赵秀进常好银
Owner 安徽佑骏商品混凝土有限公司
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