Regarding sulfides in natural gas
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Raw natural gas, depending on its source, usually contains varying amounts and forms of sulfides. Sulfides are generally divided into inorganic sulfides and organic sulfides. How is organic sulfur distinguished between reactive and non-reactive types? For example: thiol and carbon disulfide belong to reactive sulfides ； Sulfides and thiophenes, on the other hand, are non-reactive. Please, an expert, explain this. Thank you
Thioethers and thiophenes are relatively stable and difficult to remove. Hydrogenation at around 450 degrees Celsius is required to convert organic sulfur into inorganic sulfur, thereby enabling its removal. For more details, please refer to books on desulfurization. file:///D:QQ Screenshots/Unnamed.JPG This post was last edited by liyanghong on December 13, 2007, at 10:18
The sulfides present in natural gas include: 1. Hydrogen sulfide: It is soluble in water; its aqueous solution is acidic, and it can react with bases to form salts. It can be easily removed at room temperature, and it can also react with certain metal oxides or salts. 2. Thiols: They are insoluble in water but can react with bases; they can be absorbed using alkaline solutions. Lower alcohols can be completely removed at temperatures of 150–250 degrees, with a hydrogen partial pressure of 20 atmospheres and a liquid space velocity of 0.5–1 hour^-1. 3: Thioethers must be heated to over 400 degrees before they decompose into alkenes and hydrogen sulfide. 4: Disulfides undergo hydrogenation conversion using cobalt-molybdenum catalysts at temperatures of 175–200 degrees. 5: Disulfides can react with hydrogen to produce hydrogen sulfide, thiols, etc.; they can be easily removed through catalytic processes at temperatures of 100–250 degrees. 6: Sulfur oxides react with water vapor at high temperatures to produce hydrogen sulfide and carbon dioxide. 7: Thiophene is insoluble in water and has stable properties; it is difficult to decompose even when heated to 500 degrees. It belongs to the category of sulfides that are most difficult to remove. The so-called ‘non-reactive sulfides’ refer to thiophene and its derivatives. Between 300 and 400, it is converted into hydrogen sulfide by cobalt-molybdenum hydrogenation, with butadiene, butylene, butane, etc. being produced simultaneously.