Method for preparing hydrogen sulfide through electrochemical reduction of sulfur dioxide

A sulfur dioxide, electrochemical technology, applied in the direction of electrodes, electrolysis process, electrolysis components, etc., can solve the problems of unfavorable large-scale production, consumption of large industrial chemical raw materials, and many types of reaction products, so as to facilitate industrial application and improve Faraday efficiency , the effect of maintaining catalytic stability

Active Publication Date: 2021-07-16
CENT SOUTH UNIV
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

This method requires a high temperature of 200-500 ° C, and there are many types of reaction products, which are difficult to purify
Chinese patent (application number CN201910526382.4) introduces a 2 SO 4 As a raw material, through pH adjustment, carbon matching, solid-liquid separation, roasting and dilute H 2 SO 4 Preparation and other processes to prepare H 2 The method of S gas, the overall process of this method is long, and produces a large amount of waste salt, and needs to consume a large amount of industrial chemical raw materials, the cost is high, and it is not conducive to large-scale production
Chinese patent (CN111593363A) discloses a method for the electrocatalytic reduction of sulfur dioxide with a lead electrode. This method can produce a small amount of hydrogen sulfide, but the main product is sulfur, which fails to achieve efficient conversion of hydrogen sulfide. inactivation problem

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 10mL of sulfur dioxide absorption solution (converted to SO 2 0.1mol / L) was taken into the cathode chamber as the catholyte, and 10mL of anhydrous sodium sulfate aqueous solution (0.1mol / L) was used as the anolyte; sulfuric acid was used to adjust the pH=0.5 of the cathode and anolyte. Au / PTFE membrane electrode is used as the working electrode, the voltage is -1.2V, hydrogen sulfide is electrolyzed, and the faradaic efficiency of hydrogen sulfide is 99.56%.

Embodiment 2

[0033] 10mL of sulfur dioxide absorption solution (converted to SO 2 0.1mol / L) into the cathode chamber as the catholyte, 10mL of anhydrous sodium sulfate aqueous solution (0.1mol / L) as the anolyte; sulfuric acid is used to adjust the pH of the cathode and anolyte to 0.5. The Au / PTFE membrane electrode is used as the working electrode, the reduction voltage is -1.4V, hydrogen sulfide is produced by electrolysis, and the faradaic efficiency of hydrogen sulfide is 97.93%.

Embodiment 3

[0035] 10mL of sulfur dioxide absorption solution (converted to SO 2 0.1mol / L) into the cathode chamber as the catholyte, 10mL of anhydrous sodium sulfate aqueous solution (0.1mol / L) as the anolyte; sulfuric acid is used to adjust the pH of the cathode and anolyte to 0.5. The Au / PTFE membrane electrode is used as the working electrode, the reduction voltage is -1.6V, hydrogen sulfide is produced by electrolysis, and the faradaic efficiency of hydrogen sulfide is 89.93%.

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Abstract

The invention discloses a method for preparing hydrogen sulfide through electrochemical reduction of sulfur dioxide. According to the method, sulfur dioxide absorption liquid is subjected to electrochemical reduction through a membrane electrode to generate hydrogen sulfide gas. The method can realize high-efficiency and high-selectivity conversion of the sulfur dioxide absorption liquid into hydrogen sulfide, so that colloidal sulfur which is generated on the cathode and adhered to the surface of the cathode can be prevented from poisoning the cathode, and the method does not need to additionally add a reducing agent, does not generate waste salt, can be carried out under normal-temperature and normal-pressure conditions, and is simple to operate and convenient for large-scale application.

Description

technical field [0001] The present invention relates to a resource treatment method for sulfur dioxide flue gas, in particular to a method for converting SO 2 The method for highly selective conversion of flue gas into more economically valuable hydrogen sulfide through electrochemical reduction belongs to the field of industrial flue gas resource management. Background technique [0002] With the increasingly stringent requirements for environmental protection, a large amount of SO produced by process industries such as nonferrous metallurgy 2 Resource processing is urgently needed. Currently SO 2 The resource recovery method is mainly to produce sulfuric acid. Although sulfuric acid is a bulk industrial product, it is also a dangerous product. It is inconvenient to store and transport. When the sulfuric acid cannot be sold, it becomes a major problem for enterprises. Hydrogen sulfide is a chemical product with a wide range of uses. Will SO 2 Reduction to produce H 2 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/01C25B11/031C25B11/056C25B11/057C25B11/065C25B11/081C25B11/075
CPCC25B1/00C25B1/22C25B11/052C25B11/081C25B11/057C25B11/075C25B9/19B01D53/502B01D53/73B01D2251/304B01D2251/306B01D2258/0283C25B1/01C25B1/50C25B9/23B01D53/78B01D2251/604C25B15/08
Inventor 刘恢向开松刘旭东沈锋华朱芳芳伍琳易慧敏柴立元闵小波林璋李青竹王庆伟王海鹰杨卫春
Owner CENT SOUTH UNIV
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