Influence of Aromatic Saturation Depth in Hydrocracking Hydrotreating Section on Side Chain Breaking Reaction and Ring Opening Reaction of Cyclic Hydrocarbons
Refined products with different aromatic saturation ratios were obtained by adjusting the process parameters of the hydrocracking hydrotreating section,of which the classification and data processing were conducted based on the number of ring structures of hydrocarbon molecules.Moreover,the influence of aromatic saturation depth on the side chain breakage and ring opening reactions in the hydrotreating section was studied based on the reaction thermodynamic data.The results show that monocyclic hydrocarbons are the major reactants of the side chain breaking reaction in the hydrotreating section.As the saturation rate of aromatic hydrocarbons is increased,the conversion of alkyl benzene to alkyl cyclohexane resulted in the decreasing stability of carbonium ions from reactants,which may be the main reason for the decline of the side chain breaking reaction equilibrium constant and low reaction rate.Under low aromatic saturation ratios,the hydrogenation for removal of cyclic hydrocarbon molecules such as sulfur-containing compounds(thiophenes)is the major process of ring opening reaction;with the increasing of the aromatic saturation rate,cyclic hydrocarbon molecules with four or more rings can be converted to low ring number cyclic hydrocarbons through ring opening reaction,while cyclic hydrocarbons with three or less rings are mainly converted into cycloalkanes with the same ring number through aromatic saturation reaction.
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