Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Efficient constant-temperature process for preparing tribromophenol by sodium bromide method

A technology of tribromophenol and sodium bromide, which is applied in the field of high-efficiency constant temperature process for preparing tribromophenol by sodium bromide method, can solve the problems of high synthesis cost, harsh equipment and process requirements, and great harm of hydrobromic acid, and achieves Fewer products, lower requirements, and higher utilization

Pending Publication Date: 2021-10-26
SHANDONG RUNKE CHEM +1
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The traditional synthesis process of tribromophenol is based on phenol and hydrobromic acid, but hydrobromic acid is very harmful, and the preparation process has strict requirements on equipment and processes, and the synthesis cost is relatively high

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

[0022] A high-efficiency constant temperature process for preparing tribromophenol by a sodium bromide method, specifically comprising the following steps:

[0023] a) Pre-reaction: Add raw materials and solvents to a constant temperature reaction kettle equipped with a stirring mechanism to obtain a solid-liquid mixture A. The raw materials include 1-3 parts of phenol, 2-10 parts of sodium bromide, 10-20 parts of water and Concentration is 7-25 parts of hydrochloric acid of 30%, described solvent is dimethyl sulfoxide, and the number of parts by weight of dimethyl sulfoxide is 10-20 parts (parts are parts by weight, the same below);

[0024] b) Adding reaction reagents dropwise: at room temperature, turn on the mixer, and add 10% hydrogen peroxide solution dropwise to the thermostatic reaction kettle in step a), the hydrogen peroxide is added in parts by weight of 10-30 parts , the dropping rate is 0.5-1 part / min;

[0025] c) Reaction stirring: the stirring mechanism in the ...

Embodiment 2

[0031] A high-efficiency constant temperature process for preparing tribromophenol by a sodium bromide method, specifically comprising the following steps:

[0032] a) Pre-reaction: Add raw materials and solvent to a constant temperature reaction kettle equipped with a stirring mechanism to obtain a solid-liquid mixture A. The raw materials include 1-2 parts of phenol, 4-6 parts of sodium bromide, 12-18 parts of water and Concentration is 10-15 parts of hydrochloric acid of 30%, described solvent is dimethyl sulfoxide, and the number of parts by weight of dimethyl sulfoxide is 10-15 parts;

[0033] b) Dropwise addition of reaction reagents: at room temperature, turn on the mixer, and dropwise add a hydrogen peroxide solution with a concentration of 10% to the thermostatic reaction kettle in step a), the number of parts by weight of hydrogen peroxide added is 12-20 parts , the dropping rate is 0.5-0.8 parts / minute;

[0034] c) Reaction stirring: the stirring mechanism in the c...

Embodiment 3

[0040] A high-efficiency constant temperature process for preparing tribromophenol by a sodium bromide method, specifically comprising the following steps:

[0041] a) Pre-reaction: Add raw materials and solvents into a constant temperature reaction kettle equipped with a stirring mechanism to obtain a solid-liquid mixture A. The raw materials include 1 part of phenol, 5 parts of sodium bromide, 15 parts of water and 30% hydrochloric acid 12 parts, the solvent is dimethyl sulfoxide, and the added parts by weight of dimethyl sulfoxide are 15 parts;

[0042] b) Adding reaction reagents dropwise: at room temperature, turn on the mixer, and dropwise add a hydrogen peroxide solution with a concentration of 10% to the thermostatic reaction kettle in step a), and add 15 parts by weight of hydrogen peroxide, drop The acceleration is 0.5 parts / minute;

[0043] c) Reaction stirring: the stirring mechanism in the constant temperature reactor continued to stir, and reacted for 1 hour to ...

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 an efficient constant-temperature process for preparing tribromophenol by a sodium bromide method, wherein the process comprises the following steps: a) pre-reaction: adding raw materials and a solvent into a constant-temperature reaction kettle to obtain a solid-liquid mixture A, wherein the raw materials comprise phenol, sodium bromide, water and hydrochloric acid, and the solvent is dimethyl sulfoxide; b) dropwise adding a reaction reagent: dropwise adding a hydrogen peroxide solution into the constant-temperature reaction kettle in the step a); c) reacting and stirring: reacting to obtain a solution B; d) constant-temperature reaction: performing constant-temperature water bath on the solution B to obtain a solid-liquid mixture C; e) concentration: transferring the solid-liquid mixture C into a constant-temperature evaporation concentrator, and adding water for constant-temperature evaporation to obtain a solid D; f) washing: washing the solid D with water and carrying out vacuum filtration; and g) drying: placing the solid D in a drying oven and drying to obtain the tribromophenol. The invention relates to the technical field of chemical production, and in particular, relates to the efficient constant-temperature process for preparing the tribromophenol by the sodium bromide method, wherein the process can reduce the production cost and improve the utilization rate of the raw materials.

Description

technical field [0001] The invention relates to the technical field of chemical production, in particular to a high-efficiency and constant-temperature process for preparing tribromophenol by a sodium bromide method. Background technique [0002] Fire can bring huge material and economic losses to people. Flame retardant materials can effectively restrain the spread of fire. There is a great demand for flame retardant materials in the international market, and the demand for flame retardant materials in industrial production It is increasing year by year. Tribromophenol is an important basic material for the synthesis of flame retardants. The reactive flame retardants synthesized using it can be applied to many materials such as epoxy resin and polyurethane, and have good economics and development prospects. [0003] The traditional synthesis process of tribromophenol is based on phenol and hydrobromic acid, but hydrobromic acid is very harmful, and the preparation process h...

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): C07C37/62C07C37/70C07C39/27
CPCC07C37/62C07C37/70C07C39/27
Inventor 吴多坤秦善宝单宝娜孙盛元孟玉花袁淑凤李彦卿
Owner SHANDONG RUNKE CHEM
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products