Kinetic Modeling of Oil Cracking

TSUZUKI, N.,YOKOYAMA, Y., TAKAYAMA, K., Japan National Oil Corporation, Chiba, Japan; SUZUKI, M., TAKEDA, N., Japex Research Center, Chiba, Japan

Hydrous pyrolysis of Sarukawa oil, generated from type II kerogen, was performed to establish the kinetic model of oil cracking for basin modeling. The amount of gas( C1-C5 hydrocarbons), light oil (C6-C14 hydrocarbons), heavy oil (C15+ hydrocarbons) and coke( CH2Cl2 insoluble) were measured, and the structural changes of light and heavy oil  with pyrolysis were examined using 1H-NMR. Based on the structural changes, we developed a new first order kinetic model using seven psuedo-components (gas, light saturates, light aromatics, heavy saturates, heavy aromatics1, heavy aromatics2 and coke). The degration of each fraction is described with four reaction equations. The apparent activation energy (Ei) , pre-exponential factor (Ai) and stoichiometric coefficient (aij) were optimized by a conventional least square/ minimum error function method. The model and the obtained kinetic parameters satisfactorily describe the cracking behavior of Sarukawa oil in hydrous pyrolysis experiments.

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