Method for removing sulfate ions by high-temperature membrane method

A sulfate ion, high temperature membrane technology, applied in chemical instruments and methods, water treatment parameter control, water/sludge/sewage treatment, etc., can solve the problems of high energy consumption, high cost, and great harm to humans and animals

Pending Publication Date: 2020-08-04
HENGXINGRUNFENG TECH DEV BEIJING
View PDF0 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] There are two methods for removing sulfate ions in the existing chlor-alkali industry. One uses the barium chloride method to remove sulfate ions. The disadvantage is that the cost is high. Barium chloride is a highly toxic chemical that is harmful to human...

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
  • Method for removing sulfate ions by high-temperature membrane method
  • Method for removing sulfate ions by high-temperature membrane method
  • Method for removing sulfate ions by high-temperature membrane method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0117] 1. Pretreatment of light brine

[0118] Pretreatment of chlor-alkali industrial ion membrane electrolysis light brine, removal of free chlorine (i.e. dechlorination treatment), pH adjustment (i.e. pH adjustment treatment), fine-tuning temperature (i.e. temperature adjustment treatment) and filtration to remove impurities, to obtain high temperature pretreatment Treat brackish water, where:

[0119] In the process of pretreatment to remove free chlorine, adjust the free chlorine content in the light brine to be zero, and the known dechlorination methods in the art are applicable to the present invention;

[0120] In the process of adjusting the pH, adding alkali or hydrochloric acid to adjust the pH of the light brine to 4-7, the existing methods for adjusting the pH of the solution known in the art are applicable to the present invention;

[0121] In the process of adjusting the temperature, fine-tune the temperature of the light brine to 60-80°C to obtain a slightly l...

Embodiment 2

[0134] Such as figure 2 , 2A , ion membrane electrolysis light brine sulfate removal system, according to the process requirements of high-temperature membrane denitrification at least includes light brine dechlorination unit 10, light brine temperature fine-tuning unit 1, light brine pressurization unit 2, membrane separation unit 3, crystallization- Separation unit 4, MVR concentration unit 5 or dilute brine direct desalination unit.

[0135] Chlor-alkali industrial ionic membrane electrolysis light brine is input into the light brine pretreatment unit for free chlorine removal, pH adjustment, temperature fine-tuning treatment (that is, temperature adjustment treatment), and filtration and impurity removal treatment.

[0136] 1. Dechlorination treatment of light brine

[0137] The chlor-alkali industrial ion membrane electrolysis light brine is dechlorinated, free chlorine is removed (i.e. dechlorination treatment), pH is adjusted (i.e. pH adjustment treatment), temperatu...

Embodiment 2A

[0161] Such as image 3 The ionic membrane electrolysis light brine desulfation treatment system includes a dechlorination purification unit 10, a pressurization unit 2, and a membrane separation unit 3 connected in sequence through pipelines; and a crystallization-separation unit 4 connected to the outlet of the concentrated solution of the membrane filtration unit , the concentrating unit 5 connected to the fresh water outlet of the membrane filtration unit, except that the temperature fine-tuning unit is not included, the rest are the same as in embodiment 1.

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 discloses a method for removing sulfate ions by a high-temperature membrane method. The method comprises the following steps: pretreating high-temperature electrolyzed light salt brine;performing dechlorination treatment on the high-temperature electrolyzed light salt brine in the pretreatment process; adjusting the pH value of the high-temperature electrolyzed light salt brine; finely adjusting the temperature of the high-temperature electrolyzed light salt brine to slightly reduce the temperature of the high-temperature electrolyzed light salt brine; and then carrying out membrane separation treatment, crystallizing and separating the saline water with high sulfate ion concentration after membrane separation, and concentrating the saline water with low sulfate ion concentration after membrane separation or returning the saline water with low sulfate ion concentration to a saline water process for salt melting. According to the method, sulfate radicals in the electrolyzed light salt brine are removed through a high-temperature nanofiltration process, the treatment temperature of the light salt brine treated by the system is high, desulfurization acid radical treatment can be carried out without cooling to 45 DEG C or below, and the use amount of cooling water is remarkably reduced; and in addition, the temperature of filtrate obtained after membrane filtration is high, heat consumption during MVR evaporation or salt melting is reduced, energy consumption is reduced in the MVR concentration process, and energy is saved.

Description

technical field [0001] The invention relates to a desulfation radical treatment system and method, in particular to a brine desulfation radical treatment system and method, and belongs to the technical field of chlor-alkali equipment. Background technique [0002] Chlor-alkali industry refers to the industrial production of caustic soda, chlorine and hydrogen by electrolysis of saturated NaCl solution, and is one of the important basic chemical industries. The electrolysis is carried out in a vertical diaphragm electrolyzer, which divides the electrolyzer into an anode chamber and a cathode chamber. When the power is turned on, under the action of the electric field, the negatively charged Cl - moving towards the anode, the positively charged H + Moving to the cathode, under these conditions, the following reaction occurs on the electrode: [0003] Anode: 2Cl - -2e=Cl 2 ↑ [0004] Cathode: 2H + +2e=H 2 ↑ [0005] That is, Cl is released in the anode chamber 2 , the...

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): C02F9/10C02F101/10
CPCC02F1/44C02F1/461C02F1/46104C02F1/66C02F9/00C02F2101/101C02F2209/02C02F2209/06C02F2209/10
Inventor 李晓明
Owner HENGXINGRUNFENG TECH DEV BEIJING
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