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Sweetening Processes

Sweetening Processes. Presence of sulphur compounds like H 2 S and mercaptans makes the oil sour Sour stocks have bad odour The processes by which the foul smelling sour petroleum products are converted into sweet smelling or odourless products are called sweetening processes.

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Sweetening Processes

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  1. Sweetening Processes • Presence of sulphur compounds like H2S and mercaptans makes the oil sour • Sour stocks have bad odour • The processes by which the foul smelling sour petroleum products are converted into sweet smelling or odourless products are called sweetening processes

  2. Important Sweetening processes • Doctor’s sweetening process • Copper chloride sweetening process • Catalytic desulphurization • Hydrofining process

  3. Doctor’s sweetening process • Mercaptans present in the petroleum products are converted into disulphide by treatment with doctor’s solution and sulphur • 2RSH + Na2PbO2 => Pb(RS)2 + 2NaOH • Pb(RS)2 + S => PbS + RSSR • PbS + 2O2 => PbSO4 • PbSO4 + 4 NaOH => Na2PbO2 + Na2SO4 + 2H2O • Temp. 65 C

  4. Copper chloride sweetening process • 2CuCl2 + 2RSH => RSSR + 2HCl + Cu2Cl2 • 2Cu2Cl2 +4HCl + O2 => 4CuCl2 + 2H2O

  5. Catalytic desulphurization • Catalysts e.g. bauxite can be used to convert the sulphur containing compounds to hydrogen sulphide • Used for sweetening of gasoline and kerosine • 2RSH => RSSR + H2S

  6. Hydrofining process • Catalytic desulphurization in the presence of hydrogen • Molybednum oxide, cobalt oxide as catlyst • 350-450 C, 20-50 atm • Operating conditions for various feed stocks vary

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