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Secondary bromine-extracting method by using waste water from bromine-extracted brine

A technology for brine and waste water, applied in bromine/hydrogen bromide, heating water/sewage treatment, degassed water/sewage treatment, etc., can solve problems such as waste of resources, and achieve the effect of increasing production and improving utilization rate

Active Publication Date: 2007-10-24
山东昌邑灶户盐化有限公司
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AI Technical Summary

Problems solved by technology

At present, after using this method to extract bromine once from brine, the waste water is discharged, and the contained bromine that has not been extracted is also discharged together, thus causing a waste of resources

Method used

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Embodiment Construction

[0017] The method for secondary extraction of bromine by using brine to extract bromine from waste water includes the steps of acidification, oxidation, desorption and absorption in sequence, wherein:

[0018] A, acidification, add acidic distillation waste liquid produced in the distillation process step to the waste brine discharged after the bromine is once extracted, acidify the waste brine to a pH value of 2.5-3, and inhibit the hydrolysis of chlorine and bromine;

[0019] B. Oxidation. Chlorine gas is introduced into the acidified waste brine, and the chlorine distribution rate is controlled at 100%-108%. The introduced chlorine gas reacts with bromide ions to generate chloride ions and bromine. This step is to carry out in pipeline, and static mixer is housed in pipeline, so that increase the mixing and contacting of chlorine gas and waste brine, the length of pipeline is to satisfy the reaction of chlorine gas and bromide ion completely;

[0020] C, desorption, this st...

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Abstract

The invention discloses a second bromine-extracting method in the waste water, which comprises the following steps: acidifying; oxidizing; desorbing; adsorbing. The invention can extract 55-70 percent 40ppm-80ppm bromine in the waste liquid through first extraction, which improves total extracting rate by over 90 percent.

Description

technical field [0001] The invention relates to a method for secondarily extracting bromine from wastewater using brine to extract bromine. Background technique [0002] Bromine is an important chemical raw material, widely used in high-efficiency flame retardants, refrigerants, petroleum finishing fluids, pharmaceuticals, fuel intermediates, and chemical reagents. At present, there are following three methods for extracting bromine from brine: 1. Distillation, which is suitable for brines with a bromine content of more than 2 kilograms per cubic meter, and has a narrow scope of application; 2. Air blowing out lye absorption method, which The method is stable in process, but it consumes a lot of electricity and consumes a lot of acid and alkali. It is suitable for occasions where there is sufficient electricity and cheap waste acid and alkali; 3. Air blowing out sulfur dioxide absorption method. The extraction rate of bromine can reach 70%-80%. At present, after the bromin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B7/09C02F1/66C02F1/76C02F1/20C02F1/04
Inventor 付忠东李学德张盼贵张国泉卢波徐立国
Owner 山东昌邑灶户盐化有限公司
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