Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A method and device for producing caustic soda by electrolysis of light brine instead of part of refined brine

A technology for salt water purification and light salt water, applied in the electrolysis process, electrolysis components, energy input and other directions, can solve the problems of low NaCl decomposition rate, large amount of long-term circulation, high production cost, high utilization rate, increased usage, and ratio reduced effect

Active Publication Date: 2016-01-13
SHANDONG LUTAI HLDG GRP CO LTD
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical task of the present invention is to aim at the deficiencies of the prior art, the method of converting part of the light brine removed from the anode area of ​​the electrolytic cell through free chlorine conversion, concentration and dehydration, preheating and heating, and returning to the electrolytic cell to replace part of the refined brine to electrolyze caustic soda, It partially solves the problems of low NaCl decomposition rate in the existing ionic membrane caustic soda production process, high production cost caused by complex reuse process of light brine containing free chlorine, high cost of treatment, long cycle volume of primary refining and secondary refining processes

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

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A method and device for producing caustic soda by electrolysis of light brine instead of part of refined brine
  • A method and device for producing caustic soda by electrolysis of light brine instead of part of refined brine
  • A method and device for producing caustic soda by electrolysis of light brine instead of part of refined brine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] as attached figure 1 Shown, a kind of light brine of the present invention replaces the method for the electrolysis of part of refined brine to produce caustic soda, this method divides the light brine out of the tank into two parts in proportion according to the production needs, one part is dechlorinated and denitrified, and the desalinated water refining unit is used, and the other part Desalinated brine reuse unit, in which the ratio of dechlorination and denitrification desalination refining unit is determined according to the content of impurity ions in the brine entering the tank. Under the premise that the brine entering the tank is qualified, the desalination refining unit after dechlorination and denitrification should be minimized Ratio, in general, the industry can refer to the desalinated water refining unit after dechlorination and denitrification: the ratio of desalinated brine reuse unit (by mass fraction) is 1:3 to 1:4.

[0046] The brine refining unit ...

Embodiment 2

[0073] Example 2 is the same as Example 1, except that in order to further reduce energy consumption in actual production, the standard for reusing light brine in the above step 2) refers to increasing the NaCl content to 255-265g / L and reusing light brine After being mixed with raw refined brine, the content of impurity ions is consistent with the known secondary brine quality standard.

Embodiment 3

[0075] Example 3 is the same as Example 1-2, except that in order to further reduce energy consumption in actual production, the brine standard for entering the tank in the above step 4) means that the NaCl content contained therein is 285-295g / L, and the remaining impurities The ion content is consistent with the known secondary brine quality standard.

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 producing caustic soda through electrolysis by replacing part of fine brine with light salt brine, and belongs to the technical field of the production of caustic soda in an ion membrane process. The method is characterized in that outlet light salt brine is divided into two parts according to the production requirements, one part of the light salt brine enters a brine refining unit after being dechlorinated and denitrified, the other part of light salt brine enters a light salt brine recovery unit, the light salt brine recovery unit is characterized by comprising the following process steps: completely converting free chorines dissolved in the outlet light salt brine to NaClO by virtue of a free chlorine conversion subunit, concentrating and dehydrating the light salt brine with the free chlorine being removed by virtue of a concentration dehydration subunit to obtain recovered light salt brine, recovering the heat of high temperature saturated wet chlorine by virtue of a preheating subunit, directly mixing the preheated recovered light salt brine with raw material fine brine according to a given ratio to obtain a mixture, and electrolyzing the mixture in an electrolytic cell to obtain caustic soda. The invention also relates to a device for preparing the caustic soda in an electrolytic way by adopting the light salt brine to substitute the fine brine. The light salt brine refining process is simplified, the production cost is low, the electrolytic waste heat utilization rate is high, a great amount of cheap brine can be used for substituting solid salt to prepare the caustic soda, and the chlorine doping rate is more than 90 percent.

Description

technical field [0001] The invention relates to the technical field of caustic soda production by ionic membrane method, in particular to the production of caustic soda by ion membrane method, in which part of the light salt water removed from the anode area of ​​the electrolytic cell is converted by free chlorine, concentrated and dehydrated, preheated and heated, and then returned to the electrolytic cell to replace part A method and device for producing caustic soda by electrolysis of refined brine. Background technique [0002] At present, domestic production of caustic soda is mainly based on ion-exchange membrane method. In the ionic membrane caustic soda production process, the original salt (or part of the brine mixed) is dissolved into saturated crude brine, and the Ca in the original salt (or part of the brine) is removed through primary brine refining and secondary brine refining. 2+ , Mg 2+ , SO 4 2- Such as impurity ions and suspended matter, the refined bri...

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
Patent Type & Authority Patents(China)
IPC IPC(8): C25B1/46C25B15/08
CPCY02P20/129
Inventor 朱发彬
Owner SHANDONG LUTAI HLDG GRP CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com