Method for cleansing exhaust gas of sulfureted hydrogen in low concentration

Abstract

The invention relates to a purification method of low concentration hydrogen sulfide waste gas, adds a sort of Mn (NO3)2 and Mn (CH3COO) 2 into the FeCl3 solution which contains Fe3+, evenly stirring, adds a or several kinds of ethylenediamine tetraacetic acid, sulfosalicylic acid, citric acid as the metal ion stabilizer, adjusting the solution pH value to 8-10 with Na2CO3 and NaHCO3, getting the complex ion absorption solution. Joins the complex ion absorption solution and the low thickness sulfureted hydrogen into the impact flow reactor and control the response temperature in 50-80deg.c, the oxygen content volume in the waste gas is 0.5-20%, carries on the absorption purification response to reduce the purification efficiency to lower than 70%, takes out the absorption solution and filters, the filtrate carries on the drum oxygen regeneration, the hydrogen sulfide purification efficiency may maintains above 95% in the long time. The invention is the purification method which is able to treat the hydrogen sulfide waste gas whose volume percentage concentration is below than 0.1%, with the absorption solution recycle, and high absorption purification efficiency.

Description

1. Technical field

[0001] The invention relates to a method for liquid-phase catalytic oxidation of low-concentration hydrogen sulfide waste gas, which belongs to the technical field of catalytic technology applied to air pollution purification. 2. Technical background

[0002] Natural gas, coke oven gas, coal gas, petroleum cracking gas and other gases all contain a certain amount of hydrogen sulfide and organic sulfur compounds. Sulphides in raw gas can poison catalysts of chemical reactions, corrode equipment and pipelines, and affect product quality; sulfur-containing combustion products and industrial device relaxation gases discharged into the atmosphere will endanger human health and pollute the environment. With the increasingly stringent environmental requirements, more stringent requirements have been put forward for the concentration of sulfide in the exhaust gas, and the problem of hydrogen sulfide purification in industrial waste gas has become increasingly prom...

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