Mr.Kermitel - Thanks for the reply

Well, im more concerned in knowing the detailed difference between hydro-desulphurisation and hydrotreating.
Both the processes use hydrogen and the use of hydrogen will also result in saturation of double and triple bond components.
Are these process named different due to the extent of removal of hetero components or H2S or degree of saturation.
Is there a difference in severity between the two process or difference in operating conditions.

Thanks,