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Biodesulfurization of Light Fuel Oil

Najafi, Helya | 2011

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 41608 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Farhadi, Fatollah; Molaei, Asghar; Arabeyan, Daruosh
  7. Abstract:
  8. Biological removal of sulfur compounds from petroleum is one of the major attractions of environmental technologies in the oil industry. Inefficient sulfur removal in refining processes causes sulfur oxides (SOx) production after combustion, which has adverse effects on the environment.Today the most common way to remove sulfur from crude oil is Hydrodesulfurization which has poor performance in removing some heterocyclic compounds such as thiophenes. Increase the amount of sulfur in the remaining oil reserves and the other hand, more stringent environmental regulations, has led researchers to development and invent new methods for desulfurization. Biological desulfurization is one of these new processes.In the present work, suitable bacterium for desulfurization was selected among 17 microorganisms which were isolated from oil-contaminated soil. Simulated solution of thiophenic compounds (Dibenzothiophene solution in n-dodecane) was used. The effect of three important parameters on desulfurization rate including bacteria concentration, oil phase fraction and concentration of dibenzothiophene were investigated.In the next step, statistical model of desulfurization rate and optimization of it, were obtained by response surface methodology. Under optimized conditions, 79.1% amount of desulfurization was achieved. Moreover, by calculating kinetic parameters, this process has been detected as first-order.Finally, desulfurization of Kerosene with 2300ppm initial sulfur -to appraise the efficiency of this method for real samples of oil- was resulted 32% conversion.


  9. Keywords:
  10. Biodesulfurization (BDS) ; Microorganisms ; Dibenzothiophene (DBT) ; Response Surface Method ; Kinetic Equations

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