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Preparation of tetrabromobisphenol A bis(2,3-dibromopropyl)ether

A technology of tetrabromobisphenol and dibromopropyl, applied in the field of fine chemical industry, can solve the problems of accumulation and storage agglomeration, pollution of production area and operators, reduction of thermal decomposition temperature, etc.

Inactive Publication Date: 2011-10-26
HUAIHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Thereby causing tetrabromobisphenol A diallyl ether bromination reaction is not complete and tetrabromobisphenol A bis(2,3-dibromopropyl) ether entrains tetrabromobisphenol A diallyl ether oligomer The problem is that this is the crux of the thermal decomposition temperature of tetrabromobisphenol A bis(2,3-dibromopropyl) ether and the accumulation and storage of serious agglomeration
It is easy to cause dust to fly in the composite synthetic material, polluting the production work area and operators

Method used

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Examples

Experimental program
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Effect test

Embodiment Construction

[0016] Bromination reaction and cleaning process: put 780 kg of chloroform into the reaction kettle, take 400 kg of tetrabromobisphenol A diallyl ether and dissolve it in the chloroform solvent. After adding 18 kg of aluminum bromide in the bromine high level tank, inject 216 kg of bromine. Start the reactor to stir, open the reactor coolant valve, keep the material in the reactor at 15-25°C, open the discharge valve of the bromine high level tank, and continuously drop bromine and catalyst into the material in the reactant. After the bromine and catalyst have been added dropwise, the reactor coolant valve is closed. Curing at 40-45°C for 1 hour. Add 150 kilograms of soda ash brine solution with a mass percentage of 3% in the reaction kettle, stir for 1 hour, separate the washing alkali brine, add clear water for secondary washing, and separate the washing water to obtain tetrabromobisphenol A bis(2, 3-Dibromopropyl) ether in chloroform.

[0017] Spray desolventization and ...

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PUM

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Abstract

The invention provides a preparing method of tetrabromobisphemol A bi(2, 3-dibromopropyl)ether. In a chloroform solvent, the bromine adding reaction of tetrabromobisphemol A diene propyl ether and bromine is carried out under the catalyzing influence of calcium bromide, zinc bromide, aluminium bromide, nickelous bromide, iron bromide, ammonium bromide, cupric bromide, tetrabutyl ammonium bromide,tetraethyl ammonium bromide or triethyl benzyl ammonium bromide and the like. The chloroform solvent in the obtained tetrabromobisphemol A bi(2, 3-dibromopropyl)ether chloroform saturated solution can be eliminated after being directly heated by pulverized vapor, and granulation or milling processes can be finished simultaneously. After the processes of centrifuge dripping, drying and the like, the powder or graininess tetrabromobisphemol A bi(2,3-dibromopropyl)ether with limited particle size distribution can be obtained. The recovery rate of the chloroform solvent is more than 97 percent.

Description

technical field [0001] The invention relates to a method for preparing an organic bromide, in particular to a method for preparing a flame retardant tetrabromobisphenol A bis(2,3-dibromopropyl) ether, and belongs to the field of fine chemicals. technical background [0002] Tetrabromobisphenol A bis(2,3-dibromopropyl)ether is an organic bromide special-effect flame retardant applied to polypropylene materials. Existing tetrabromobisphenol A bis (2,3-dibromopropyl) ether industrial production technique is to continue to use the preparation method that US4302614 discloses, and it is that tetrabromobisphenol A diallyl ether is dissolved in halogenated hydrocarbon In the solvent, bromine is added dropwise to complete the bromine addition reaction process; finally, excess bromine is removed by washing with sodium sulfite, and the bromine removal washing process is completed by secondary washing with clear water to obtain tetrabromobisphenol A bis(2,3-dibromopropane base) saturat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C43/225C07C41/22
Inventor 张田林周杰兴
Owner HUAIHAI INST OF TECH
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