Method for extracting bromine by industrial wastewater rich in Br-

A technology of industrial waste water and bromine, applied in chemical instruments and methods, bromine/hydrogen bromide, water/sewage treatment, etc., can solve problems such as high cost and unfriendly environment, achieve good economic and social benefits, reduce Production cost, cost reduction effect

Inactive Publication Date: 2012-07-11
HUAIBEI NORMAL UNIVERSITY +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of chlorine gas as an oxidant is costly, and the process is not friendly to the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] This embodiment makes electrolyzer with plexiglass, separates into cathode chamber and anode chamber with cation exchange membrane, and anode and cathode all adopt graphite electrode, and the effective area of ​​cathode and anode is respectively 200cm 2 , the distance between cathode and anode is 1.5cm.

[0018] Get the fumaric acid waste water 2000mL that pH value is 2.5-3.5, contain in the fumaric acid waste water: fumaric acid 3.4g / L, maleic acid 0.7g / L, sodium bromide 2.7g / L and a small amount of ammonium sulfate; Fumaric acid wastewater is filtered to remove suspended matter and transferred to the anode chamber; add 2000mL of maleic acid solution with a mass percentage concentration of 36% in the cathode chamber, keep stirring, control the temperature at 30°C, and control the current density at 0.03A / cm 2 Carry out electrolysis, and use turbidimetry to test Br in the anolyte during the electrolysis process - Concentration, when Br - When the concentration of the ...

Embodiment 2

[0020] The initial composition of the electrolytic cell and electrolyte of this embodiment is the same as that of Example 1. The temperature is controlled to be 40°C under constant stirring, and the constant voltage is controlled to be 5.0V for electrolysis. - When the concentration is no longer reduced, the electrolysis is stopped. After the anolyte was removed, 3.2 g of bromine was obtained through air blowing, condensation, gas-liquid separation, and water-bromine separation, with a recovery rate of 77.0%. The catholyte was removed, concentrated, cooled, and solid-liquid separated to obtain 2.9 g of succinic acid.

[0021] For fumaric acid wastewater, the recovery rate of bromine is slightly higher than the constant voltage method in Example 2 by the constant current method in Example 1.

Embodiment 3

[0023] The industrial wastewater in this example is the industrial wastewater from the production of the upland herbicide—metrimetrione, and the content of sodium bromide is 0.87 mol / L after methanol is removed by rectification. The amount and pH value of the electrolytic cell and the initial electrolyte are as in Example 1, the temperature is controlled at 40°C under constant stirring, and the constant voltage is controlled to be 5.0V for electrolysis. During the electrolysis, the Br in the anolyte is tested by turbidimetry. - When the concentration is no longer reduced, the electrolysis is stopped. After the anolyte was removed, 110.1 g of bromine was obtained through air blowing, condensation, gas-liquid separation, and water-bromine separation, with a recovery rate of 79.1%. After the catholyte was removed, 71.2 g of succinic acid was obtained by concentration, cooling, and solid-liquid separation.

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PUM

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Abstract

The invention discloses a method for extracting bromine by industrial wastewater rich in Br-, and is characterized in that bromine is obtained by electrochemical oxidation, blow-out, and collection of industrial wastewater which is pretreated by purification and is rich in Br-; in the electrochemical oxidation, an electrolytic tank is partitioned into a cathode chamber and an anode chamber by an ion exchange membrane; the anode electrolyte is an aqueous solution which is rich in Br- and is obtained by purification treatment of the industrial wastewater rich in Br-; the cathode electrolyte is an acid solution with a pH of 1-4; the temperature of the electrolytes is controlled at 25-45 DEG C; the current density is 0.01-0.1 A/cm2; or a constant voltage is 0.5-6.0 V; after electrolytic balance is reached, the anode electrolyte is removed, and bromine is obtained by air blow-out, condensation, gas-liquid separation, and water-bromine separation. The method of the invention overcomes the disadvantages of bromine preparation by traditional oxidation process through chlorine, hypochlorite, and the like; the method is applicable to the treatment of industrial wastewater with a bromide ion concentration of 0.02-11.5 mol/L, and the process is simple and environment-friendly.

Description

technical field [0001] The invention relates to a preparation method of bromine, more specifically a method for recovering bromine by using the electrochemical oxidation method of industrial waste water. Background technique [0002] The natural resources of bromine are mainly seawater and ancient ocean sediments, namely rock salt mines. About 99% of bromine on earth is found in seawater. Bromine and bromine products play a very important role in the national economy, and it is mostly used in the preparation of compounds in organic and inorganic chemicals. The main uses are: the preparation of pesticides in agriculture, the preparation of disinfectants in environmental protection, the preparation of treatment agents for civil use, the production of gasoline explosion-proof agents in the petroleum industry, and other industries such as photography and medicine. With the development of industry and science and technology, the demand for bromine is increasing all over the wor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B7/09C02F1/461
Inventor 王永秋陈康魏振中吴金城张培红王昌济
Owner HUAIBEI NORMAL UNIVERSITY
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