(183e) The Binary Pyrolysis of Sulfur Compounds with Alkyl Aromatics and n-Alkanes

Petroleum refiners need reliable kinetic models for the optimization of oil residue conversion processes. Modeling of chemical reactions involving heavy ends of petroleum is complicated. Structures and mixtures are very complex, and dissimilar depending on the origin of crudes.

Countless species differ in reactivity should be accounted for in these models, which in turn needs explicit molecular detail of the feed. During conversion many structural changes take place, high boiling compounds broken down into smaller fragments; all sulfur as well as metals such as vanadium and nickel are removed and the most of the aromatics turn into naphthenes which further turn into paraffins and iso-paraffins.

Pure hydrocarbon model compounds pyrolysis gives important information about the reaction kinetics. The purpose of model compounds pyrolysis and its components is to reveal the actual chemical kinetics of the molecules that play a fundamental role during the conversion process. Binary pyrolysis of pure hydrocarbons obtained from the reaction of sulfur compounds reactions will provide important information about heavy oil conversion reactions.

In this study, the binary pyrolysis of decilmercaptane, thiophene n-tetradecane and butyl benzene was investigated at reaction temperatures of of 400-500 °C temperature for reaction time ranging from 30 min to 180 min. In the second phase with the same reaction conditions the binary compounds pyrolysis was carried out. Reaction rate constants and arrhenius parameters for the pyrolysis of binary mixtures obtained from the reaction model were compared with pure compounds.