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Hydrogen sulfide removal method based on photocatalytic spraying

A technology of hydrogen sulfide and photocatalysis, applied in chemical instruments and methods, separation methods, inorganic chemistry, etc., can solve the problems of inability to meet environmental protection requirements, difficult product utilization, and low oxidation efficiency.

Inactive Publication Date: 2015-09-23
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented process allows for reuse of waste material from production processes such as manufacturing or processing without causing environmental concerns associated with disposal thereof in an environmentally friendly manner.

Problems solved by technology

This technical problem addressed in this patented text relates to finding an economic and efficient way to treat exhaust gas containing hydrogen Sulfide with improved purification capabilities without causing harmful effects upon human health. Current technologies involve either expensive materials like specialty metals or reactive resin systems, or complex processes involving multiple steps.

Method used

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  • Hydrogen sulfide removal method based on photocatalytic spraying
  • Hydrogen sulfide removal method based on photocatalytic spraying
  • Hydrogen sulfide removal method based on photocatalytic spraying

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] Example 1. The flue gas inlet temperature of the impingement bed is 100°C, and the liquid-gas ratio is 0.5L / m 3 , the dosage of titanium dioxide is 0.1kg / m 3 , the concentration of hydrogen peroxide is 0.5mol / L, the pH of the solution is 3.4, the temperature of the solution is 70°C, the content of hydrogen sulfide in the flue gas is 300ppm, and the effective radiation intensity of ultraviolet light is 25μW / cm 2 , The effective wavelength of ultraviolet light is 254nm. The results of the small test are: the hydrogen sulfide removal efficiency reaches 58.2%.

Embodiment 2

[0076] Example 2. The flue gas inlet temperature of the impingement bed is 100°C, and the liquid-gas ratio is 0.5L / m 3 , the dosage of titanium dioxide is 0.1kg / m 3 , the concentration of ammonium persulfate is 0.5mol / L, the pH of the solution is 3.4, the solution temperature is 70°C, the content of hydrogen sulfide in the flue gas is 300ppm, and the effective radiation intensity of ultraviolet light is 25μW / cm 2 , The effective wavelength of ultraviolet light is 254nm. The results of the small test are: the hydrogen sulfide removal efficiency reaches 50.8%.

Embodiment 3

[0077] Example 3. The flue gas inlet temperature of the impingement bed is 100°C, and the liquid-gas ratio is 0.5L / m 3 , the dosage of titanium dioxide is 0.3kg / m 3 , the concentration of hydrogen peroxide is 0.5mol / L, the pH of the solution is 3.4, the temperature of the solution is 70°C, the content of hydrogen sulfide in the flue gas is 300ppm, and the effective radiation intensity of ultraviolet light is 25μW / cm 2 , The effective wavelength of ultraviolet light is 254nm. The results of the small test are: the hydrogen sulfide removal efficiency reaches 67.2%.

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Abstract

The invention relates to a hydrogen sulfide removal method based on photocatalytic spraying. The method adopts ultraviolet light in combination with a catalyst to decompose a superoxide generating hydroxyl or sulfate free radicals with high oxidizing property as an oxidizing agent, and hydrogen sulfide in flue gas is removed in an impact bed. Flue gas from an emission source is injected into the impact bed by high-speed nozzles coaxially arranged in opposite directions respectively after being mixed with catalyst particles. At the same time, a superoxide solution is injected into the impact bed through an atomizer, and an air-liquid-solid mixture is sufficiently mixed in the impact bed, so that the mass transfer rate is greatly improved. The hydroxyl or sulfate free radicals with high oxidizing property are generated through decomposition of the superoxide by adopting the ultraviolet in combination with the catalyst so as to oxidize and remove the hydrogen sulfide, a sulfuric acid solution generated through reaction enters a postprocessing system to generate an ammonium sulfate fertilizer; the system can realize 100% removal rate of hydrogen sulfide, the product can be recycled, and the method has wide development prospect.

Description

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Claims

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Application Information

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Owner JIANGSU UNIV
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