Method for extracting bromine from bromine-containing wastewater

A bromine and waste water technology, applied in bromine/hydrogen bromide, chemical instruments and methods, water/sewage multi-stage treatment, etc., can solve problems such as huge equipment, high energy consumption, temperature influence, etc., and achieve good economic benefits, The effect of reducing production costs and cost reduction

Inactive Publication Date: 2014-03-05
ZHEJIANG SHUANGYI ENVIRONMENTAL PROTECTION TECH DEV
View PDF2 Cites 11 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The air blowing method is currently the main bromine extraction method in my country. Although the air blowing method has strong adaptability to the bromine content of raw materials and is easy to automate control, i

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0019] Embodiments of the present invention provide a method for extracting bromine from bromine-containing wastewater, comprising the following steps:

[0020] Pretreatment: Filtrate the bromine-containing wastewater so that the turbidity of the filtered bromine-containing wastewater is lower than the preset value; specifically, the bromine-containing wastewater first enters the membrane filtration device for pretreatment, and the membrane filtration is carried out by submerged ultrafiltration membranes Filtration, the ultrafiltration membrane is made of PVC material, the pore size of the ultrafiltration membrane is 0.02μm, the designed membrane filtration flux is 20L / m2 h, the operating pressure difference of the membrane is lower than 40kPa, the membrane filtration device is intermittently aerated, and online chemical cleaning is carried out regularly , to prevent membrane fouling;

[0021] Acidification: Add hydrochloric acid or sulfuric acid to industrial wastewater conta...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention relates to a method for extracting bromine from bromine-containing wastewater, which comprises the following steps: pretreatment: filtering the bromine-containing wastewater so that the turbidity of the filtered bromine-containing wastewater is lower than the preset value; acidification: adding hydrochloric acid or sulfuric acid into industrial wastewater containing bromide ions to adjust the pH value of the industrial wastewater to 3-5; oxidation: adding an oxidizing agent into the acidified industrial wastewater for oxidation to generate bromine; extraction: adopting n-dodecane as an extraction agent, 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; rectification: rectifying the n-dodecane and bromine solution obtained by the liquid separation so that bromine is separated from n-dodecane to obtain a bromine product. In the method provided by the invention, bromine is extracted by a solvent extraction process; compared with the traditional technology, the use of steam is greatly saved, the cost of whole bromine extraction is remarkably reduced, and better economic benefits are obtained.

Description

technical field [0001] The invention belongs to the technical field of industrial wastewater treatment, in particular to a method for extracting bromine from bromine-containing wastewater. Background technique [0002] Bromine is one of the important chemical raw materials. A wide variety of inorganic bromides, bromates and bromine-containing organic compounds derived from it have special value in the development of national economy and science and technology. Aromatic organic bromides are widely used in pharmaceuticals, pesticides, dyes, etc. When bromination reactions are used to prepare aromatic organic bromides, the utilization rate of bromine is only 50%, so it will produce hydrobromic acid, bromine Industrial wastewater rich in bromide ions such as sodium chloride and potassium bromide. If the bromine in hydrobromic acid, sodium bromide, and potassium bromide is extracted into raw material bromine, the cost will be greatly reduced, considerable economic benefits will ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C01B7/09C02F9/10
Inventor 郑炜李荧陈吕军李伟
Owner ZHEJIANG SHUANGYI ENVIRONMENTAL PROTECTION TECH DEV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap