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Device and method for extracting bromine from tetrabromobisphenol A wastewater

A technology of tetrabromobisphenol and waste water, applied in the technical field of bromine extraction, can solve the problems of increasing the specific gravity of mother liquor, overloading, and rising boiling point of evaporation, and achieve the effects of realizing recycling, simple process flow, and improving treatment effect.

Pending Publication Date: 2020-04-21
天津长芦汉沽盐场有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the solubility of sodium bromide is much greater than that of sodium sulfate, the concentration and enrichment of sodium bromide in the circulating mother liquor will gradually increase the proportion of the mother liquor, causing the current of the three-effect evaporation circulating pump to continue to increase, and the boiling point of evaporation to rise, affecting the three Evaporation effect, in severe cases, it will cause overload, burn out the motor, and block the tubes in the heating chamber

Method used

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  • Device and method for extracting bromine from tetrabromobisphenol A wastewater

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Effect test

Embodiment 1

[0040] The waste water discharged in the tetrabromobisphenol A production process of the present invention contains bromide ions, and its concentration is about 2-3g / L, after being concentrated to a certain extent in the three-effect evaporation system, bromine extraction operation is carried out through the mother liquor after filtering, the After the mother liquor is concentrated 20 times by three-effect desalination, its bromide ion concentration reaches 40g / L. With the discharge of part of the mother liquor, the concentration of sodium bromide in the evaporation system can be effectively controlled, and the influence caused by the enrichment of sodium bromide can be eliminated.

[0041] The discharged mother liquor is acidified by adding acid, the pH value is adjusted to 2, enters in the first distillation column, and feeds chlorine gas (2Br - +cl 2 ==Br 2 +2cl - ), steam for the first distillation, and control the temperature of the first distillation tower at 92° C., ...

Embodiment 2

[0044] The waste water discharged in the tetrabromobisphenol A production process of the present invention contains bromide ions, and its concentration is about 2-3g / L, after being concentrated to a certain extent in the three-effect evaporation system, bromine extraction operation is carried out through the mother liquor after filtering, the After the mother liquor is concentrated 20 times by three-effect desalination, its bromide ion concentration will reach 50g / L. With the discharge of part of the mother liquor, the concentration of sodium bromide in the evaporation system can be effectively controlled, and the influence caused by the enrichment of sodium bromide can be eliminated.

[0045] The discharged mother liquor is acidified by adding acid, the pH value is adjusted to 2, enters in the first distillation column, and feeds chlorine gas (2Br - +cl 2 ==Br 2 +2cl - ), steam for the first distillation, and control the temperature of the first distillation tower at 93° C...

Embodiment 3

[0048] The waste water discharged in the tetrabromobisphenol A production process of the present invention contains bromide ions, and its concentration is about 2-3g / L. After being concentrated to a certain extent in the three-effect evaporation system, the bromine extraction operation is carried out through the filtered mother liquor. After the mother liquor is concentrated 20 times by three-effect desalination, its bromide ion concentration reaches 60g / L. With the discharge of part of the mother liquor, the concentration of sodium bromide in the evaporation system can be effectively controlled, and the influence caused by the enrichment of sodium bromide can be eliminated.

[0049] The discharged mother liquor is acidified by adding acid, and the pH value is adjusted to 3, enters in the first distillation tower, and feeds chlorine gas (2Br - +cl 2 ==Br 2 +2cl - ), steam for the first distillation, and control the temperature of the first distillation tower at 95° C., and ...

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Abstract

The invention discloses a method for extracting bromine from tetrabromobisphenol A wastewater, and belongs to the field of tetrabromobisphenol A production. Wastewater discharged in the tetrabromobisphenol A production process is subjected to triple-effect desalination concentration, acidification, primary distillation and condensation to obtain crude bromine, the crude bromine is absorbed by AN alkali liquor, then enters a second distillation tower and undergoes secondary distillation, bromine gas generated by the secondary distillation is condensed, and bromine water is separated to obtain finished bromine. The method has the following advantages: the influence of sodium bromide concentration and enrichment of a triple-effect desalination system on a production device in the wastewater treatment process of tetrabromobisphenol A is avoided, the treatment effect of triple-effect evaporation is improved, qualified bromine is obtained, and the recycling of bromine resources is realized.The method is simple in technological process, common equipment is adopted, the investment cost is low, and good economic benefits can be obtained through the extracted bromine.

Description

[0001] Field [0002] The invention relates to a technology for extracting bromine in the field of waste water treatment produced in the production process of tetrabromobisphenol A (abbreviated as TBBA). Background technique [0003] Tetrabromobisphenol A is a brominated flame retardant widely used at present. It is made of bisphenol A, bromine, hydrogen peroxide, chlorobenzene, sulfuric acid, etc. It is prepared by washing with water, crystallization filtration, drying and packaging for many times. Wastewater generated during aging, bleaching, washing and other operations, due to the addition of excess bromine in order to ensure the conversion rate of bisphenol A, causes the generated waste water to contain bromide ions. The main inorganic salt in TBBA wastewater is sodium sulfate, and bromide ions exist in the form of sodium bromide in wastewater. The way to deal with sodium sulfate in the wastewater treatment process is to use three-effect evaporation to concentrate, prec...

Claims

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Application Information

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IPC IPC(8): C02F9/10C01B7/09C02F103/36
CPCC02F9/00C01B7/096C02F2103/36C02F1/048C02F1/04C02F1/66C02F1/001
Inventor 周青云刘朝晖张传彬朱华贵马君
Owner 天津长芦汉沽盐场有限责任公司
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