Hydrogen sulfide gas emissions
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I would like to ask whether hydrogen sulfide-containing gases can be directly released into the atmosphere? If permitted, what are the emission concentration standards?
Hydrogen sulfide is a highly toxic gas, so it certainly cannot be released directly. The chemical industry generally uses the Claus process to remove hydrogen sulfide.
The value above is the factory limit; the actual emission concentration depends on the height of the exhaust stack.
Definitely not anymore. If you want to save money, you can use activated carbon for adsorption and then regenerate it at high temperatures to obtain sulfur, or burn it and absorb the resulting substances with an alkaline solution.
Just kidding. Hydrogen sulfide is so toxic; it cannot be released!
It definitely can’t be discharged directly; I think I’ve heard that it shouldn’t exceed 20 ppm.
Chemical name: Hydrogen sulfide (H2S). Molecular structure: The S atom forms bonds using sp3 hybridized orbitals; the molecule has a V-shaped structure and is a polar molecule. Chemical description: Hydrogen sulfide is a colorless, toxic gas with a foul egg-like odor. When the volume fraction of hydrogen sulfide in the air exceeds 0.1%, it can cause poisoning symptoms such as headaches and dizziness; therefore, the preparation or use of hydrogen sulfide must be carried out in a closed system or fume hood. The aqueous solution (hydrogen sulfide) is weakly acidic. Chemical formula H2S. Molecular weight 34.08. It is a type of air pollutant. Density is 1.539 grams per liter3. Melting point: -85.5°C, boiling point: -60.7°C. A toxic, foul-smelling colorless gas. When the air contains 0.1% H2S, it can cause headaches and dizziness. Inhaling large amounts of H2S can cause coma or even death. Exposure to high levels of H2S can cause chronic poisoning, leading to deteriorated senses, headaches, weight loss, and other symptoms. In industrial production, the H2S content in the air is required to not exceed 0.01 milligrams per liter. H2S is slightly soluble in water, and its aqueous solution is called hydrosulfuric acid. It has unstable chemical properties, can burn in air when ignited, and possesses reducing properties. It can cause the surfaces of silver and copper products to turn black. When it reacts with many metal ions, it forms sulfide precipitates that are insoluble in water or acid. It reacts with many non-metals to produce free sulfur.
It is a highly toxic hazardous substance that often causes poisoning through electrical contact; therefore, it must be treated and converted into non-toxic substances before it can be discharged.
Hydrogen sulfide gas is toxic and should not be released; meanwhile, it can be used as a raw material for producing sulfur, so releasing it would represent a waste
The emission concentration is indeed directly related to the emission height. The person in charge can take appropriate actions based on the specific H2S content in the exhaust gases; when the concentration is high, the CLAUS or super-CLAUS method can be used, followed by CLISULF (for H2S concentrations not exceeding 4%). Finally, alkaline solution absorption can be employed (which can reduce the H2S concentration to 20 ppm), thereby meeting the emission requirements.
Relationship between hydrogen sulfide emissions and chimney height. Chimney height, m: 15, 20, 25, 30, 35, 40, 60, 80, 100, 120. Emissions, kg/h: 0.33, 0.58, 0.90, 1.3, 1.8, 2.3, 5.2, 9.3, 14, 21