Method for recycling bromine from bromine-containing wastewater of brominated butyl rubber

A technology of bromobutyl rubber and waste water, applied in chemical instruments and methods, bromine/hydrogen bromide, water/sewage multi-stage treatment, etc., to achieve the effects of cost reduction, consumption reduction, and good economic benefits

Inactive Publication Date: 2014-03-05
ZHEJIANG SHUANGYI ENVIRONMENTAL PROTECTION TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the techniques for extracting bromine at home and abroad include the traditional steam distillation method and the air blowing method. There is a big difference

Method used

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Embodiment Construction

[0018] Embodiments of the present invention provide a method for reclaiming bromine from brominated butyl rubber bromine-containing wastewater, comprising the following steps:

[0019] Pretreatment: pass brominated butyl rubber bromine-containing wastewater into the air flotation device, add coagulant to remove large particles of colloidal substances and organic pollutants, and then pass the effluent from the air flotation device into the security filter for filtration , so that the turbidity of the effluent is less than the preset value; specifically, firstly, brominated butyl rubber bromine-containing wastewater is passed into the air flotation device, and coagulant is added to the air flotation device to make the colloidal particles suspended in the bromine-containing wastewater Substances aggregate into larger particles. Under the action of microbubbles, the particulate matter floats to the water surface and is removed. At the same time, the air flotation device can remove ...

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Abstract

The invention relates to a method for recycling bromine from bromine-containing wastewater of brominated butyl rubber, which comprises the following steps: pretreatment: feeding the bromine-containing wastewater of brominated butyl rubber into an air flotation device, adding a coagulant to remove large colloidal particle matters and organic pollutants, and filtering so that the turbidity of the output water is lower than the preset value; acidification: adding hydrochloric acid or sulfuric acid into the filtered bromine-containing wastewater to adjust the pH value to 3-5; oxidation: adding an oxidizing agent into the acidified bromine-containing wastewater for oxidation to generate bromine; extraction: adopting n-dodecane as an extraction agent, adding n-dodecane into the oxidized bromine-containing wastewater, and extracting bromine from an aqueous phase to an n-dodecane phase; liquid separation: performing liquid separation on the two-phase solution added with the extraction agent, wherein the upper layer is an oil phase, and the lower layer is an aqueous phase; separating the aqueous phase from the oil phase, recycling the oil phase, and discharging the aqueous phase. By adopting the method provided by the invention, the bromine recycling cost is greatly reduced, and better economic benefits are obtained.

Description

technical field [0001] The invention belongs to the technical field of industrial wastewater treatment, and in particular relates to a method for recovering bromine from brominated butyl rubber bromine-containing wastewater. Background technique [0002] Bromobutyl rubber is an isobutylene-isoprene copolymer elastomer containing activated bromine. Since bromobutyl rubber has a basically saturated main chain of butyl rubber, it has various properties of butyl polymers, such as high physical strength, good shock absorption, low permeability, aging resistance and Weather resistance is an irreplaceable raw material for the manufacture of tubeless tires and a necessary raw material for medical rubber products, which is a strategic material. [0003] In the production process of bromobutyl rubber will produce NaBr, Na 2 SO 4 、Na 2 SO 3 And a small amount of organic matter in wastewater, the concentration of NaBr in the wastewater can reach 5000-10000mg / L, which is wastewater ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B7/09C02F9/08
Inventor 陈吕军李荧李伟郑炜
Owner ZHEJIANG SHUANGYI ENVIRONMENTAL PROTECTION TECH DEV
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