I would like to ask how hydrogen sulfide is handled in China
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How is hydrogen sulfide handled domestically? This post was last edited by lyhh9024 on 2009-2-26 at 18:28.]
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I’ve heard that travelers are using cadmium sulfide and titanium dioxide in hydrogen production processes, and it’s currently under experimentation
It refers to whether hydrogen sulfide is present in the gas or in the wastewater; hydrogen sulfide in the wastewater can be removed through wastewater stripping to produce a gas containing hydrogen sulfide. Sulfur recovery is then carried out, converting hydrogen sulfide into sulfur which can be made into tablets for sale. This addresses the hydrogen sulfide pollution issue while also offering economic benefits.
Hydrogen sulfide in natural gas can be treated using the CAT process; for low concentrations, oxidation methods can be employed, while for high concentrations, biological methods are used
It can react or be ignited when exposed to sulfuric acid or sodium hydroxide: 2H2S + 4O2 == 2H2O + 2SO2. The SO2 can then be processed as follows: SO2 + 2NaOH = Na2SO3. This method is suitable only for testing the chemical properties of hydrogen sulfide in the laboratory. To produce hydrogen sulfide in the laboratory, the following reaction is used: FeS + H2SO4 = H2S (gas) + FeSO4
It’s all quite troublesome, as it involves unstable negatively charged sulfur; therefore, there isn’t a perfect solution available. The only relatively good option is to use sodium carbonate – avoid using sodium hydroxide for absorption, as it’s too expensive!!
Ammonia-based methods can be tried for the recovery of sulfuric acid and AN fertilizers, and the investment required should be similar to that of the Claus process. Moreover, at high concentrations of SO2, relying solely on the Claus process is not sufficient to ensure that the exhaust gases meet the standards. This problem can be solved by using the ammonia method. Of course, this method is used less frequently, and relevant investigations and demonstrations are required.
If the concentration of hydrogen sulfide in the wastewater is high, it is removed using the stripping method and then sent to a sulfur production facility to produce sulfur. When the concentration of sulfides in the wastewater is low, it is sent to a wastewater treatment plant for treatment
The treatment of hydrogen sulfide depends mainly on its concentration; when the concentration is high, the CLUS method can be used to recover sulfur. Of course, in coal chemical processing, liquid-phase absorption processes such as tannin, MEDA, and NHD are employed, primarily for sulfur recovery. Detailed procedures can be found. Last edited in this post by qining on 2009-2-27 11:26.]
For waste gas with low concentration and low flow rate, biological treatment is used. Hydrogen sulfide can be converted into dilute sulfuric acid or sulfurous acid. The removal rate is over 98%.
In large chemical plants, hydrogen sulfide is used in a three-stage Claus process to recover elemental sulfur. The investment is high, and the products are not easy to recycle; this is generally done for environmental reasons.