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Method for preparing/gathering bromine from bromine-containing feed liquid or waste water

A technology for feed liquid and waste water, applied in the direction of bromine/hydrogen bromide, etc., can solve the problems of not being able to provide large-scale membrane modules with high specific surface area and high mass transfer performance, and difficulty in making them, so as to increase bromine output rate and prolong The effect of long service life and convenient operation

Active Publication Date: 2013-11-27
TIANJIN PURESEA SPRING MEMBRANE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is difficult for PTFE flat membranes to be made into membrane modules commonly called "membrane contactors" like hollow fiber membranes, and cannot provide large-scale membrane modules for industrial applications with high specific surface area and high mass transfer performance, making PTFE Microporous hydrophobic membranes have not been applied in the bromine extraction industry so far

Method used

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  • Method for preparing/gathering bromine from bromine-containing feed liquid or waste water
  • Method for preparing/gathering bromine from bromine-containing feed liquid or waste water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] A seawater desalination plant produces 5-6°Bé concentrated seawater with a bromine content of 108mg / L. After sulfuric acid acidification (pH value 3.5) and chlorine gas oxidation, it enters the PTFE hollow fiber gaseous membrane module tube side (single membrane module, effective membrane area 2.0m 2 , the inner diameter of the membrane is 0.6mm, the wall thickness is 100μm, the average pore size is 0.2μm, and the porosity is 65%). The absorption liquid is 45g / L sodium formate solution, and sodium formate and bromine undergo a redox reaction:

[0068] Br 2 +HCOONa=HBr+NaBr+CO 2 ↑

[0069] The sodium formate solution and the bromine-containing feed solution after acidification and oxidation flow through the shell side of the gaseous membrane module in reverse, and then flow through the tube side of another gaseous membrane module with the same specification (the shell side of the module is connected to the atmosphere) to release the produced of carbon dioxide gas.

...

Embodiment 2

[0077] A 9.0°Bé underground brine with a bromine content of 155mg / L, after being acidified with hydrochloric acid (pH value 3.5) and oxidized by chlorine gas, enters the tube pass of a polytetrafluoroethylene hollow fiber gaseous membrane module (single membrane module, effective membrane area 2.0 m 2 , the inner diameter of the membrane is 0.4mm, the wall thickness is 250μm, the average pore size is 1.0μm, and the porosity is 75%). The absorption liquid is 80g / L sodium sulfite solution, which flows through the shell side of the gaseous membrane module countercurrently with the acidified and oxidized bromine-containing feed liquid. Redox reaction between sodium sulfite and bromine:

[0078] Br 2 +Na 2 SO 3 +H 2 O=2HBr - +Na 2 SO 4

[0079] The flow rate of the bromine-containing feed liquid is 20L / h, the temperature is 30°C; the flow rate of the absorption liquid is 5L / h, the temperature is 30°C, and the pH value is 8.9. After the bromine is extracted by the gaseous ...

Embodiment 3

[0085] A 9.0°Bé underground brine with a bromine content of 237mg / L, after being acidified with sulfuric acid (pH value 3.5) and oxidized by chlorine, enters the tube pass of a polytetrafluoroethylene hollow fiber gaseous membrane module (single membrane module, effective membrane area 2.0 m 2 , the inner diameter of the membrane is 0.4mm, the wall thickness is 250μm, the average pore size is 1.0μm, and the porosity is 75%). The absorption liquid is a sodium hydroxide solution with an initial concentration of 20g / L, which flows through the shell side of the gaseous membrane module in countercurrent to the acidified and oxidized bromine-containing feed liquid. Disproportionation reaction between sodium hydroxide and bromine:

[0086] 3Br 2 +6NaOH - =5NaBr - +NaBrO 3 +3H 2 o

[0087] The flow rate of the bromine-containing feed liquid is 20L / h, and the temperature is 30°C; the flow rate of the absorption liquid is 15L / h, and the temperature is 30°C. After the bromine is ...

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Abstract

The invention relates to a method for preparing / gathering bromine from bromine-containing feed liquid or waste water. The method comprises the following steps of: (1) acidification or acidification oxidation of the bromine-containing feed liquid or waste water, namely regulating the pH value of the bromine-containing feed liquid or waste water to 3-4, wherein the bromine contained in the acidified feed liquid or waste water exists in a bromine form; (2) bromine extraction in the separation process of a gaseous film, namely carrying out bromine extraction treatment by introducing the bromine-containing feed liquid or waste water which is formed after the acidification or the acidification oxidation into a gaseous film assembly to obtain a bromide-containing gathered solution; (3) post treatment, namely carrying out the post treatment on the gathered solution, and distilling to obtain elemental bromine. According to the method, a polytetrafluoroethylene or polytetrafluoroethylene hollow fiber microporous film assembly is adopted as a bromine extraction core device, and the film assembly has the advantages of oxidation resistance and long service life. The method disclosed by the invention has the advantages of low energy consumption, high bromine mass transfer efficiency and high bromine recovery rate in a process flow, simple equipment, convenience for operation and low operating cost, can be widely applied to the bromine extraction of the bromine-containing feed liquid with various concentration ranges and various scales.

Description

technical field [0001] The invention relates to a method for extracting / enriching bromine from bromine-containing material liquid or waste water, in particular to a method for extracting / enriching bromine by using a gaseous membrane module. Background technique [0002] Bromine (elemental bromine) is an important basic chemical raw material, which is widely used in medicine, pesticides, flame retardants, fire extinguishing agents, refrigerants, photosensitive materials, fine chemicals, oil field mining and other fields. Bromine mainly exists in the ocean, oil and gas field water, underground brine and salt lake brine, and also exists in the feed liquid or wastewater of some chemical plants. [0003] Bromine extraction technology refers to the process of separating bromine in the form of simple substances. At present, the main methods for extracting bromine are steam distillation and air stripping-absorption. [0004] The steam distillation method uses chlorine gas to oxidi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B7/09
Inventor 秦英杰张艳萍刘立强崔东胜张昆明
Owner TIANJIN PURESEA SPRING MEMBRANE TECH CO LTD
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