Essay On Hydrogen Sulfide

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Hydrogen sulfide is a colorless gas with an obnoxious rotten egg odour. H2S is highly flammable, noxious and vitriolic in nature. Many petroleum and natural gas processing industries produces H2S as a by-product gaseous stream. Most H2S in the air comes from natural sulfur cycle. Exposure to H2S can lead to various health issues like burning/tearing of eyes, cough, and shortness of breath. Moderate concentration can lead to respiratory issues. So it is advisable to make use of this gas in other industrial operations.

Elemental sulfur is conventionally produced using H2S by Claus Process which is further utilized in the production of H2SO4 or rubber industries. But high amount of energy and necessary process control over oxygen and H2S ratio makes Claus process uneconomical. H2S-laden gas can be utilized well by absorbing into aqueous alkanolamine and then using this reagent to produce organo-sulfur compounds like thioether, mercaptans, disulfides etc., which have higher usability and better market value.

The overall objective of this project is to study of synthesis of aromatic disulfide using H2S rich aq. alkanolamine and Benzyl Chloride in presence of phase transfer catalyst.
Hydrogen sulfide is a colorless gas with an obnoxious rotten egg odour. H2S is highly flammable, noxious and vitriolic in nature. Its presence can be felt by smell at very low levels, as low as 0.5 ppb in air. Many petroleum and natural gas processing industries produces H2S as a by-product in gaseous stream. Most H2S in the air comes in from natural sulfur cycle. It is produced when bacteria decompose plant and animal material, often in stagnant waters where oxygen content is low such as bogs and swamps. Volcanic eruptions, sulfur springs, salt marsh...

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...orrosion inhibitors, foam depressants, buffers, etc. They offer advantages like selective H2S removal, partial or complete CO2 removal, high acid gas loading, COS removal etc. (Manning and Thompson, 1991; Pearce and Wolcott, 1986; Thomas, 1988: Meissner and Wagner. 1983; Meissner, 1983; Niswander et al., 1992).
MDEA- Methyldiethanol amine is clear, colorless pale yellow with ammonia odour, miscible with water, alcohol, benzene with chemical composition CH3N (C2H4OH)2 . It is a sweetening agent.
Advantages of using MDEA over MEA or DEA:
1. The fact that MDEA is a tertiary amine makes it less basic. Also there is no hydrogen attached to nitrogen. So if any CO2 is present in gas, it can react only after CO2 dissolves in order to form bicarbonate, which then undergoes acid-base reaction with amines. But both MEA and DEA react with all the CO2 present in the gas stream.

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