Method for recovering sodium bromide from bromine-containing wastewater

A recovery method, sodium bromide technology, applied in the field of sodium bromide recovery, can solve environmental impact and other problems, and achieve the effect of low equipment requirements, low cost and simple operation

Active Publication Date: 2017-11-10
ZHEJIANG HUAHAI TIANCHENG PHARMA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods have their own advantages and disadvantages, but all require the use of oxidants and the recovery of bromine
In the recycling process, there are high requirements for recycling equipment and safe operation, and have a certain impact on the environment

Method used

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  • Method for recovering sodium bromide from bromine-containing wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Add 300ml of bromine-containing waste water to a 1000ml three-necked reaction flask, add 2.1g of refined hydrochloric acid to adjust the pH to 8, then add 100ml of toluene to wash twice, separate the organic layer and control the temperature of the water layer at 40-50°C for vacuum distillation To dry 46.1g. Add 300g of methanol, control the temperature at 25-35°C and stir for 1 hour, and filter to obtain 18.6g of miscellaneous salt wet product. The filtrate was distilled under reduced pressure at a temperature of 40-50°C to dryness of 32.5g. Then add 40g of methanol, control the temperature at 25-35°C and stir for 1 hour, then filter to obtain 30.3g of wet product, and dry to obtain 25.2g of crude sodium bromide. The purity of sodium bromide is 90.2%, and the yield is 94.3%.

Embodiment 2

[0020] Add 300ml of bromine-containing waste water to a 1000ml three-necked reaction flask, add 2.2g of refined hydrochloric acid to adjust the pH to 7, then add 100ml of toluene to wash once, remove the organic layer and control the temperature of the water layer at 40-50°C for vacuum distillation To dry 45.5g. Add 300g of methanol, control the temperature at 25-35°C and stir for 1 hour, and filter to obtain 19.1g of miscellaneous salt wet product. The filtrate was distilled under reduced pressure at a temperature of 40-50°C to dryness of 33.1 g. Then add 40g of methanol, control the temperature at 25-35°C and stir for 1 hour, then filter to obtain 31.3g of wet product, and dry to obtain 25.5g of crude sodium bromide. The purity of sodium bromide is 90.5%, and the yield is 95.4%.

Embodiment 3

[0022] Add 300ml of bromine-containing waste water to a 1000ml three-necked reaction flask, add 2.3g of refined hydrochloric acid to adjust the pH to 6, then add 100ml of toluene to wash once, separate the organic layer and control the temperature of the water layer at 40-50°C for vacuum distillation To dry 46.1g. Add 300g of methanol, control the temperature at 25-35°C and stir for 1 hour, and filter to obtain 18.9g of miscellaneous salt wet product. The filtrate was distilled under reduced pressure at a controlled temperature of 40-50°C to dryness of 33.5g. Then add 50g of methanol, control the temperature at 25-35°C and stir for 1 hour, then filter to obtain 29.3g of wet product, and dry to obtain 23.7g of crude sodium bromide. The purity of sodium bromide is 87.8%, and the yield is 88.7%.

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Abstract

The invention relates to a method for recovering sodium bromide from bromine-containing wastewater. The method comprises the following steps: adjusting the pH value of the bromine-containing wastewater with acid, adding a solvent for washing and distilling a water layer to dryness; and adding a solvent into a material obtained after distilling, carrying out smashing, then carrying out filtering to remove impurity salts, and subjecting a filtrate to concentration so as to obtain sodium bromide. The method provided by the invention is easy to operate and friendly to environment and can prepare a crude sodium bromide product with a purity of 90%. The method is low in cost, low in requirements on equipment, simple to operate, friendly to environment and suitable for industrial production.

Description

technical field [0001] The invention relates to the field of medicine and chemical industry, in particular to a method for recovering sodium bromide from bromine-containing wastewater. technical background [0002] Biphenyl bromide is a key intermediate raw material in the preparation of sartans, and its chemical name is 4-bromomethyl-2-cyano-1,1-biphenyl. The raw material will produce hydrobromic acid or sodium bromide salt during the preparation of sartans, which is dissolved in water. [0003] It is common practice to recover the bromine in the bromine-containing wastewater by recovering bromine, which is very common in the bromine production industry. Use chlorine gas or hydrogen peroxide to oxidize bromine ions into bromine elemental substances, and then separate bromine in water, and some use the difference in boiling point to provide bromine such as steam distillation, such as "A New Bromine Extraction Technology-Steam Distillation" (natural gas exploration and Deve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D3/10C01D3/14C02F9/10C02F101/12
CPCC01D3/10C01D3/14C02F9/00C01P2006/80C02F1/04C02F2301/08C02F1/66C02F2101/12
Inventor 周小辉刘鹏董鹏方国军王伟
Owner ZHEJIANG HUAHAI TIANCHENG PHARMA CO LTD
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