Electrochemical regeneration method of polyoxometallate water solution after desulfuration

Abstract

The invention discloses an electrochemical regeneration method of a polyoxometallate water solution after desulfuration. The method comprises the steps as follows: gas containing hydrogen sulfide is introduced from the bottom of the polyoxometallate solution, and is exported from the upper end of a desulfuration reactor after being absorbed by the polyoxometallate solution; the polyoxometallate solution becomes deep blue from faint yellow after reaction for a period of time; ventilation is stopped after the numerical value of a hydrogen sulfide analyzer exceeds a constant value; the desulfurated polyoxometallate solution is electrolyzed for a period of time, anions of polyoxometallate lose electrons at an anode to be regenerated and hydrogen ions in the solution obtain electrons at a cathode to generate hydrogen; after the polyoxometallate solution becomes faint yellow from deep blue, the regeneration is completed. Regeneration of a polyoxometallate desulfurization solution is achieved by using an electrolysis method, the regeneration efficiency is high, the stability is good, the hydrogen can be generated simultaneously when the regeneration is achieved, and the electrochemical regeneration method has certain economic benefits and is beneficial to industrialized popularization.

Description

technical field [0001] The invention belongs to the technical field of air pollutant control, in particular to an electrochemical regeneration method after desulfurization of polyoxometalate aqueous solution. Background technique [0002] Hydrogen sulfide is a colorless, highly toxic, acidic gas with the smell of rotten eggs. Hydrogen sulfide gas is produced in many industrial production processes. Long-term exposure will seriously affect human health and cause corrosion of equipment and pipelines. At the same time, hydrogen sulfide can also cause catalyst poisoning, which is one of the main substances that cause air pollution, greenhouse effect and ozone layer destruction. Hydrogen sulfide is the main harmful substance in natural gas, which must be processed before it can be transported and utilized. After desulfurization treatment, hydrogen sulfide is removed and converted into sulfur. According to the different desulfurization mechanisms, the methods for removing hydro...

AI Technical Summary

Problems solved by technology

[0004] The traditional regeneration method of polyoxometalate is to pass air into the desulfurized polyoxometalate solution to make the anion of polyoxometalate change from a low-valence state to a high-valence state to achieve regeneration, but this method is not suitable The regeneration of all polyoxometalates, such as some Dawson structure phosphomolybdovanadic acid, will face some problems such as long regeneration time and low efficiency when using air regeneration

In addition to air regeneration, polyoxometalates can also 3 , Cl 2 , NO 2 , Fe 3+ However, these methods have some problems such as inconvenient operation, easy to cause secondary pollution, and low regeneration efficiency.