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Method and device for capturing carbon dioxide and simultaneously producing sulfuric acid by sodium bisulfate

A sulfuric acid and product technology, applied in the field of flue gas purification, can solve the problems of low concentration of desulfurization product NaHSO4 and limited utilization value, and achieve the effect of increasing the reuse value and simple process

Inactive Publication Date: 2020-11-13
PINGXIANG HUAXING ENVIRONMENTAL PROTECTION ENG TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the desulfurization product NaHSO 4 The concentration is low, and its utilization value is limited to a certain extent

Method used

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  • Method and device for capturing carbon dioxide and simultaneously producing sulfuric acid by sodium bisulfate
  • Method and device for capturing carbon dioxide and simultaneously producing sulfuric acid by sodium bisulfate
  • Method and device for capturing carbon dioxide and simultaneously producing sulfuric acid by sodium bisulfate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] Method for capture carbon dioxide while taking carbon dioxide while producing sulfuric acid, including the following steps: (1) at room temperature, divided into a cathode chamber, intermediate chamber and anode chamber at room temperature Injecting the initial solution of 1 wt.% Dilute sulfuric acid, cathode chamber injected into 0.5 mol / L concentration of NaOH solution, dethyl by-product (about 0.1 mol / L NaHSO) 4 ) Cycle in the middle room; 100mA / m is applied between the anode and cathode 2 The DC constant current, the male electrode is a ruthenium / 铱 titanium electrode plate, and the cathode is a graphite plate. Under the action of electric field drive and anion exchange membrane, HSO 4 - Selective enters the anode chamber, generated by electrolytic water in the anode chamber + Binding to form h 2 SO 4 And concentrated.

[0064] (2) At the same time, 10% carbon dioxide gas containing 10% carbon dioxide is performed from the bottom of the cathode chamber, and the ...

Embodiment 2

[0067] Method for capture carbon dioxide while taking carbon dioxide while producing sulfuric acid, including the following steps: (1) at room temperature, divided into a cathode chamber, intermediate chamber and anode chamber at room temperature Injecting the initial solution of 5 wt.% Dilute sulfuric acid, cathode chamber injected into 0.05 mol / L concentration NaOH solution, dethinated by-product (about 0.5 mol / L Na 2 SO 4 ) Cycle in the middle room; 30 mA / m is applied between the anode and cathode 2 The DC constant current, the male electrode is a ruthenium / 铱 titanium electrode plate, and the cathode is a graphite plate. Under the action of electric field drive and anion exchange membrane, SO 4 2- Selective enters the anode chamber, generated by electrolytic water in the anode chamber + Binding to form h 2 SO 4 And concentrated.

[0068] At the same time, at the same time, 40% carbon dioxide gas containing 40% carbon dioxide was accepted from the bottom of the cathode ...

Embodiment 3

[0071] Method for capture carbon dioxide while taking carbon dioxide while producing sulfuric acid, including the following steps: (1) at room temperature, divided into a cathode chamber, intermediate chamber and anode chamber at room temperature Injecting the initial solution of 3 wt.% Dilute sulfuric acid, cathode chamber injected into 0.3 mol / L concentration of NaOH solution, dethinated by-product (about 0.5 mol / L Na 2 SO 3 ) Cycle in the middle room; DC constant current applied between the anode and the cathode, 1000 mA / m 2 The DC constant current, the male electrode is a ruthenium / 铱 titanium electrode plate, and the cathode is a graphite plate. Under the action of electric field drive and anion exchange membrane, SO 3 2- The selective entry the anode chamber is oxidized to SO 4 2- , Hype of electrolytic water in the anode chamber + Binding to form h 2 SO 4 And concentrated.

[0072] (2) At the same time, 20% carbon dioxide gas containing 20% ​​carbon dioxide is acce...

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Abstract

The invention belongs to the field of flue gas purification, and discloses a method and a device for capturing carbon dioxide and simultaneously producing sulfuric acid by using sodium bisulfate. According to the method, a desulfurization byproduct (NaHSO4) is converted into H2SO4 by using a three-grid electrodialysis device, and CO2 in flue gas is captured in a cathode chamber. Under the action of electric field driving and an ion exchange membrane, HSO4<-> enters an anode chamber to generate H2SO4 and is concentrated, and Na<+> enters the cathode chamber to generate NaOH; and CO2 containinggas to be treated is introduced from the cathode chamber and is absorbed and captured by NaOH. The technology is simple, green and economical, carbon dioxide in the flue gas is captured in the comprehensive utilization process of the sodium bisulfate solution, good environmental benefits are achieved, updating and upgrading of the flue gas treatment technology in China are promoted, and the treatment pressure of desulfurized gypsum is relieved.

Description

Technical field [0001] The present invention is a method and apparatus for capturing carbon dioxide, sodium hydrogen sulfate while producing sulfuric acid of one kind, belonging to the field of flue gas cleaning. Background technique [0002] Our coal as the main energy, air pollution SO2 emissions from coal combustion process caused particularly significant. Calcium-based wet flue gas desulfurization (FGD) is the flue gas SO2 control the most widely used technology, but the workers Yi per 1 ton SO2 removal will produce 2.7 tons of FGD gypsum. Because gypsum complex composition, utilization rate, increasing its stock pile, the soil and groundwater caused a huge environmental risk, but also a waste of valuable calcium, sulfur and resources. [0003] In a similar field, CN761617A Chinese patent discloses a process for the preparation of sodium hydrogen carbonate using ammonium sulfate and sodium sulfate solution using ammonium bicarbonate, the separation step after the evaporation,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B17/74C01D7/07B01D53/62B01D53/78B01D61/42C25B1/10
CPCC01B17/74C01B17/745C01D7/07B01D53/78B01D53/62B01D61/422B01D2258/0283B01D2251/304Y02C20/40C01B17/806C25B1/22C25B9/21C25B15/08C25B9/13C25B1/16C25B11/061C25B11/051C25B9/23C25B11/043
Inventor 宁平李波王川李凯宋辛解若松贾丽娟王厦瞿广飞李婵
Owner PINGXIANG HUAXING ENVIRONMENTAL PROTECTION ENG TECH CO LTD
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