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A process for electrochemical oxidation of bromide to bromine

A bromide, electrochemical technology, applied in the field of bromide ion oxidation, can solve problems such as uneconomical oxidation steps, handling dangerous chlorine/hydrochloric acid and the like

Inactive Publication Date: 2006-05-10
科学和工业研究委员会
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main disadvantage of this method is that it involves an energy-intensive step of calcination with alkali metal hydroxides, carbonates, nitrates and / or organic acid salts in an oxidizing atmosphere and requires an uneconomical additional oxidation step
Plus, it needs to deal with dangerous chlorine / hydrochloric acid

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0067] Oxidation of the bromide was accomplished by passing an aqueous solution consisting of 0.2% sodium bromide and 10% sodium chloride through the anode compartment and distilled water through the cathode compartment. A fixed current of 6.25mA / cm2 was passed across the two electrodes while the two solutions were flowing at a rate of 10ml / min. The cell potential was dropped to 3V while the temperature of the solution was maintained at 28°C. The percent conversion of bromide to bromine was 65.5% per pass with a coulombic efficiency of 58.4%. The anolyte turns to an acidic pH of 1.73.

example 2

[0069] The solution described in Example 1 was electrolyzed in the same cell at a current density of 6.25 mA / cm2. The cell potential was lowered to 3V while the solution was set to flow at 15ml / min. The temperature was maintained at 28±2°C. The percent conversion of bromide to bromine at steady state conditions was 68.2%. The Coulombic efficiency rose to 85%, while the pH of the solution dropped to 1.75.

example 3

[0071] Using the same battery as Example 1, the solution (3% magnesium chloride) containing 0.2% sodium bromide, 10% sodium chloride and 5% calcium chloride is electrolyzed at the anode, and the current density is 6.25mA / cm2. The 0.1M hydrochloric acid solution is circulated through The cathode compartments, by their reaction with the hydroxyl ions generated in the cathode compartments, prevent the precipitation of calcium (magnesium) hydroxide on the membrane surface facing the cathode. Both the anode and catholyte were set to flow at a rate of 10ml / min during electrolysis. The battery potential varies between 3 and 4V in such conditions. The battery temperature was maintained at 28°C. The bromine content in the anodized solution was 0.55 g (0.53 g) per pass, which represented a bromide to bromine conversion of 71.3% (68.4%) and a coulombic efficiency of 63.6% (61.0%).

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PUM

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Abstract

The present invention relates to a process for electrochemical oxidation of bromide to bromine, more particularly to oxidation of bromide ions in brine, bittern and effluents using an indigenous cation exchange membrane flow cell.

Description

technical field [0001] The invention relates to a process for electrochemically oxidizing bromide to bromine. The present invention particularly relates to the oxidation of bromide ions in brine, brine and effluent using intrinsic cation exchange membrane flow cells. Background technique [0002] Oxidation of bromide in its source produces elemental bromine, which is primarily used in the manufacture of organic and inorganic bromine-based compounds. These bromine compounds are useful in many fields, such as gasoline additives, agricultural chemicals, flame retardants, dyes, photographic chemicals, pharmaceuticals, and the like. In addition, high density organobromine compounds are known to be useful as hydraulic transmission / ore flotation fluids, CaBr2-ZnBr2 compositions as drilling fluids and 1,2-dibromoethylene as antiknock agents in gasoline. Additionally, bromine is used directly as a disinfectant in swimming pools and as an antioxidant to control the growth of bacteri...

Claims

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Application Information

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IPC IPC(8): C25B1/24C02F1/461C02F1/467
CPCC25B1/24C02F1/46109C02F1/4674C02F2001/46138C02F2001/46157C02F2101/12C02F2201/46125C02F2201/46145C02F2201/46195
Inventor 加德·拉马钱德来亚普什皮托·库马尔·高希文卡塔·拉马·克里希纳·萨尔马·苏萨拉桑贾伊·S·瓦格拉
Owner 科学和工业研究委员会
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