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Method for capturing SO2 through PCET reaction electrochemical cycling

A kind of SO2, electrochemical technology, applied in the field of desulfurization, can solve the problems of high energy consumption, low cost, poor stability, etc., and achieve the effect of alleviating the pressure of scarcity

Pending Publication Date: 2021-11-09
王昱飞
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a method to utilize the PCET reaction electrochemical cycle to trap SO 2 method, which is low cost and enables SO 2 resource utilization, effectively solve the current low concentration of SO 2 The technical problems of high energy consumption, low efficiency and poor stability faced by recovery and separation technology

Method used

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  • Method for capturing SO2 through PCET reaction electrochemical cycling
  • Method for capturing SO2 through PCET reaction electrochemical cycling
  • Method for capturing SO2 through PCET reaction electrochemical cycling

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Embodiment one, see figure 1 , the electrolytic cell is divided into an anode area and a cathode area by an anion exchange membrane, and the anode electrode and the cathode electrode are made of carbon fiber cloth.

[0046] use As the cathode electrocatalyst Q, the as the anode electrocatalyst QH.

[0047] Compound Q and compound QH were dissolved in 1,2 dichloroethane respectively, and the 1-butyl-3-methylimidazolium hexafluorosulfate ionic liquid with a concentration of 0.3mol / L was added as a supporting electrolyte, and the compound The concentrations of Q and compound QH in 1,2 dichloroethane are both 0.2mol / L. Configure 20%wt NaHSO respectively 3 solution and 20%wt Na 2 SO 3 solution. Will SO 2 into Na 2 SO 3 React in solution to form NaHSO 3 , so that the solution also contains HSO 3 - , SO 3 2- , and adjust the pH of the solution to 6-7. NaHSO 3 The solution and the 1,2-dichloroethane solution dissolved with compound QH are mixed and passed int...

Embodiment 2

[0059]Embodiment two, see figure 2 , the electrolytic cell is divided into an anode area and a cathode area by using a cation exchange membrane, and both the anode electrode and the cathode electrode are made of carbon fiber paper.

[0060] use As the cathode electrocatalyst Q,

[0061] use as the anode electrocatalyst QH.

[0062] Dissolve compound Q and compound QH in chloroform respectively, and add the 1-butyl-3-methylimidazolium hexafluorosulfate ionic liquid that concentration is 0.3mol / L as supporting electrolyte, described compound Q and compound QH The concentration in chloroform is 0.1mol / L. 30%wt NH were configured separately 4 HSO 3 solution and 30%wt (NH 4 ) 2 SO 3 solution, the low concentration SO 2 Respectively passed into the ammonium sulfite solution to react to generate NH 4 HSO 3 , so that the solution also contains HSO 3 - , SO 3 2- , and adjust the pH of the solution to 5-7. Will NH 4 HSO 3 The solution and the chloroform solution di...

Embodiment 3

[0065] Embodiment 3, the electrolytic cell is divided into an anode area and a cathode area by using a cation exchange membrane, and both the anode electrode and the cathode electrode are made of carbon fiber paper.

[0066] use As the cathode electrocatalyst Q, the as the anode electrocatalyst QH. Other process is identical with embodiment two.

[0067] In this example, the SO in the flue gas before capture 2 The concentration is 1550mg / m 3 , SO in flue gas after capture 2 The concentration is 48mg / m 3 , the set of SO 2 The concentration is greater than 99%. During electrolysis, the electrolysis current density is 10mA / cm -2 , the average electrolysis voltage is only 0.6V, the electrolysis efficiency is 75%, and every ton of SO captured 2 The energy consumption is only about 670kWh, and the cost is about 335 yuan per ton.

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Abstract

The invention discloses a method for capturing SO2 through PCET reaction electrochemical cycling. An ion exchange membrane is adopted to divide an electrolytic cell into an anode region and a cathode region, an organic solvent dissolved with a compound QH and a salt solution containing HSO3 <-> are added into the anode region, an organic solvent dissolved with a compound Q and a salt solution containing HSO3 <-> and SO3 < 2-> are added into the cathode region, and a direct-current power supply is applied between an anode electrode and a cathode electrode; under the action of current, SO3 < 2-> in the salt solution in the cathode region absorbs low-concentration SO2 in an object to be treated to generate HSO3 <->, the compound Q obtains electrons and receives H < + > from the salt solution containing HSO3 <-> to generate QH and SO3 < 2-> in a reduction state, and the generated SO3 < 2-> circularly absorbs low-concentration SO2; and the compound QH releases electrons and H < + > and is recovered to Q in an oxidation state, and the released H < + > reacts with HSO3 <-> in the salt solution in the anode region to generate high-concentration SO2. The method is low in cost, and can realize recycling of SO2, and solve the technical problems of high energy consumption, low efficiency and poor stability of the existing low-concentration SO2 recovery and separation technology.

Description

technical field [0001] The invention relates to desulfurization technology, in particular to the use of PCET reaction electrochemical cycle to capture SO 2 Methods. Background technique [0002] Sulfur dioxide SO 2 It is one of the main pollutants in the atmosphere. At present, flue gas desulfurization is considered to control SO 2 The most effective method for emissions, the most commonly used is the limestone / lime-gypsum wet flue gas desulfurization method. With the vigorous development of China's power industry, the desulfurization process will discharge nearly 100 million tons of desulfurized gypsum every year, but 60% of the low-grade gypsum produced by it is discarded, causing secondary pollution, which has become an important factor restricting my country's sustainable development. At the same time, the investment cost of flue gas desulfurization equipment is high at present, and the use of desulfurizers has further pushed up the cost of desulfurization. The operat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/32
CPCB01D53/32B01D2257/302
Inventor 王昱飞
Owner 王昱飞
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