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Method for extracting bromine from bromine-containing solution

A solution and extraction technology, applied in the field of bromine extraction, can solve the problems of high equipment requirements and troublesome subsequent processes, and achieve the effects of simple equipment, high recovery rate and low energy consumption

Inactive Publication Date: 2016-06-29
HARBIN INST OF TECH AT WEIHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process of air blowing out bromine will also entrain some other impurities, which will bring troubles to the subsequent process; the air blowing method has high requirements on equipment, such as the use and maintenance of the desorption tower, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A method for extracting bromine from a bromine-containing solution. The bromine-containing solution is seawater, wherein the bromine content is 63mg / L; take 1L of seawater, adjust its pH to 1.0 with 30wt% industrial hydrochloric acid, and put 0.2g of saturated Chlorine water was oxidized for 10 minutes; then 1L of mineral oil was added to the reaction solution at a ratio of 1:1, at 30°C, the stirring speed was 400 rpm, the extraction time was 30 minutes, and the primary extraction rate was 82.3% after detection; Add 10mL15wt% sodium hydroxide solution to the bromine-containing extract, then carry out stripping operation at 30°C and a stirring speed of 400 rpm for 20min, the stripping method is cross-flow stripping, and the stripping times are 3 times, back-extract until the purple color of the organic phase disappears; the organic phase after back-extraction is compared with 10:1 at room temperature, and the organic phase can be reused after two-stage washing. The strip...

Embodiment 2

[0030] A method for extracting bromine from a bromine-containing solution. The bromine-containing solution is underground brine. The bromine content in the solution is 208 mg / L, and its pH is adjusted to 1.0 with 30 wt % industrial hydrochloric acid. Take 1 L of the solution and pour it into Introduce 0.5g of chlorine gas, oxidize for 20min; then use a centrifugal extractor to carry out countercurrent 5-stage extraction according to the ratio of 1:1, the extraction temperature is 40°C, the rotational speed of the centrifugal extractor is 800 rpm, and the residence time of the material in the centrifugal extractor is 0.20min, the total extraction rate was 97.6% after testing; add 10mL of 20wt% sodium hydroxide solution to the obtained bromine-containing extract, and then carry out stripping operation at 40°C and a stirring speed of 300 rpm for 15min , the back-extraction method is counter-current back-extraction, the number of back-extraction stages is 5 times, and the purple-re...

Embodiment 3

[0032] A method for extracting bromine from a bromine-containing solution, the bromine-containing solution is concentrated seawater, the bromine content in the solution is 867mg / L, its pH is adjusted to 0.5 with 40wt% industrial hydrochloric acid, and 1L of the solution is taken and poured into it Add 600ml of sodium hypochlorite solution with a concentration of 1mol / L, and oxidize for 0.5 hours; then add 333mL of mineral oil to the reaction solution according to the ratio of 1:2, heat to 45°C, and stir in the extraction tank at a stirring speed of 300 rpm. 10min, the extraction rate of the six-stage countercurrent extraction was 98.2%; 15mL18wt% sodium hydroxide solution was added to the obtained bromine-containing extract, and then the stripping operation was carried out at 45°C and the stirring speed was 500 rpm. Extraction for 15 minutes, the back extraction method is cross-flow back extraction, the number of back extraction is 5 times, and the purple red color of the organ...

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Abstract

The invention discloses a method for extracting bromine from a bromine-containing solution. The method comprises the following steps: 1) acidifying the bromine-containing solution, and oxidizing; 2) carrying out extraction operation on the oxidized mixed solution in the step 1); 3) carrying out back extraction operation on the bromine-containing extraction organic phase obtained in the step 2); and 4) acidifying the back extraction solution obtained in the step 3) to precipitate bromine, thereby obtaining the simple substance bromine. By adopting the oxidization-extraction process, the method has the advantages of high extraction rate, simple equipment, low energy consumption and the like; the bromine extraction rate reaches 98% or above; and the extractant can be recovered.

Description

technical field [0001] The invention relates to the technical field of environmental protection chemical industry for extracting bromine. More specifically, it relates to a method for extracting bromine from a bromine-containing solution. Background technique [0002] Bromine is an important strategic chemical related to the national economy and the people's livelihood. As a main member of halogen elements, it plays an irreplaceable role in chemical modification and organic synthesis. Bromine is not only widely used in the manufacture of bromine-containing chemicals in national economic fields such as new materials, national defense and aerospace, oil exploration, flame retardant and fire extinguishing, sterilization and disinfection, energy conservation and environmental protection, medicine, pesticides and dyes. By introducing bromine element to modify the function of materials or endow chemicals with certain specific properties, more importantly, bromine plays a huge and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B7/09
CPCC01B7/096
Inventor 魏琦峰任秀莲郭敬敬陈泳兴王晓飞陈飞
Owner HARBIN INST OF TECH AT WEIHAI
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