Recycling and Reuse of Organo-sulfur Compounds from Barrels of Natural Gas Contaminated with Mercaptan Odorant

Document Type : Original Article


1 Faculty of Chemical Engineering, Babol Noshirvani University of Technology, Babol, Iran

2 Deapartmenet of chemistry, University of Mazandaran, Babolsar, Iran

3 Research and Development Center, Mazandaran Gas Company, Sari, Iran


Natural gas is odorized by trace amount of mercaptans and organic sulfides to be recognized by individuals, in case of gas leakage. These materials may pollute the environment particularly in injection station at local gas plants. Therefore, removal of sulfur compounds from the remaining odorant in barrels is essential. To remove the residual portion of mercaptans and alkylsulfide mixtures different methods were utilized which among them extraction-distillation procedure was implemented in our project owing to environmentally safe and low cost process. Different solvents such as Methyl Ethyl Ketone (MEK), Ethyl acetate, Dichloromethane (DCM), Toluene and Kerosene were attempted for the efficient extraction which among them kerosene was the most desired and the best in terms of use and environmental friendly solvent. The results showed highly efficient method for the removal of odorants in which the regenerated mercaptan from the mercaptan contaminated barrels could be reused in injection step as well as the original odorant. The GC and 1H NMR analyses confirmed that the recovered organo-sulfur compounds, mainly composed of tertiary butyl mercaptan, which was desired for re-injection into natural gas stream as suitable odorants.


 1. Tenkrat, D., Hlincik, T. and Prokes, O., “Natural gas odorization”,
In Natural Gas, IntechOpen, 2010. 
2. Kastner, J. and Director, H.R.D., “Aspects of process
measurement in the natural gas industry”, In VDI Fachkonferenz
Prozessanalytische Messtechnik in der Chemieindustrie, VDI
Wissensforum GmbH, Düsseldorf, (2011), 97–118.  
3. Liszka, K., Łaciak, M. and Olinyk, A., “Analysis of new
generation odorants applicability in the Polish natural gas
distribution network”, AGH Drilling, Oil, Gas, Vol. 31, No. 1,
(2014), 59–71.  
4. Castaneda, C.J., “Natural Disasters in the Making: Fossil Fuels,
Humanity, and the Environment”, OAH Magazine of History,
Vol. 25, No. 4, (2011), 21–25.  
5. Hannah, S., “Odorants and Odorization, A Manufacturers
Perspective”,  Appalachian  Gas  Measurement  Short  Course, 2002. 
6. Shekhawat, D., Gardner, T.H. and Berry, D.A., “Natural gas
odorants desulfurization, In AlChE Annual National Meeting,
Austin, TX (Vol. 8), (2004).
7. Cui, H., Turn, S.Q. and Reese, M.A., “Removal of sulfur
compounds from utility pipelined synthetic natural gas using
modified activated carbons”, Catalysis Today, Vol. 139, No. 4,
(2009), 274–279.  
8. Gardner, T.H., Berry, D.A., Lyons, K.D., Beer, S.K. and Freed,
A. D., “Fuel processor integrated H2S catalytic partial oxidation
technology for sulfur removal in fuel cell power plants”, Fuel,
Vol. 81, No. 17, (2002), 2157–2166.  
9. Wu, X., Schwartz, V., Overbury, S.H. and Armstrong, T.R.,
“Desulfurization of gaseous fuels using activated carbons as
catalysts for the selective oxidation of hydrogen sulfide”, Energy
& Fuels, Vol. 19, No. 5, (2005), 1774–1782.  
10. Chica, A., Corma, A. and Dómine, M.E., “Catalytic oxidative
desulfurization (ODS) of diesel fuel on a continuous fixed-bed
reactor”, Journal of Catalysis, Vol. 242, No. 2, (2006), 299–308.  
11. Shriner, R.L., Hermann, C.K., Morrill, T.C., Curtin, D.Y. and
Fuson, R.C., “The systematic identification of organic
compounds”, John Wiley and Sons, New York, 2003.