The studies on the hydrocracking process to obtain the fuel by cracking of the carbon chain from the hydrocarbon compound both in the form of gas and liquid fuels have been carried-out massively by researchers over three decade. In the present experimental study, heavy hydrocarbon represented by asphaltic base materials (named as Extracted Asbuton) and paraffinic (waxy residue from Cepu oil refinery) were used as the object of the study; by observing the differences of the reaction mechanisms and the results that can be obtained. Here the operational conditions such as pressure, temperature, and time as well as the kinds of catalyst were considered as the main parameters. The experiments were carried-out under the similar operating condition such as temperature around 350 – 500^oC, pressure around 5 up to 15 atmospheres, and evaporation time was (1 – 3) hours. As a result, it was obtained (a) the higher the temperature, pressure, and heating time, the higher hydrocracking conversion both of hydrocarbons, (b) reaction mechanism of hydrocracking by using asphalt extract as the material follows the Model 3 of the present work, in which asphalt vapor was trapped in catalyst surface, meanwhile the waxy residue followed the Model 1, (c) under the same condition, the conversion of asphalt extract was smaller than waxy residue, and (d) the conversion of asphalt extract using Pt/Pd catalyst was higher than γ-Alumina catalyst.

Keywords : Asbuton, Waxy Residue, Hydrocracking, Reaction Mechanisms.

1. Abdul Halim A.K and Khalifa E, K., (2010), fluid catalytic cracking of petroleum fraction (vacuum gas oil) to produce gasoline, Iraqi Journal of Chemical and Petrolium, Vol. 11 No.4,
pp. 33-45.
2. Abraham, Herbert, (2007), Asphalt and Allied substances their of occurence, modus of production uses in the arts and methodes of testing, page 291
3. Affandy, I. H., (2006), Hydrocracking Aspal Buton Dengan Katalis Pt / Pd 2:1 Dalam Zeolite Menjadi Bahan Bakar Minyak, Bachelor thesin, Universitas Gadjah Mada, Yogyakarta (In: Bahasa Indonesia)
4. Balci,S., Dogu, T., and Yucel, H.,(1993), Pyrolysis Kinetics of Lignocellulosic Material, Ind.Eng. Chem. Res., 32, pp. 2573-2579
5. Campbell, I .A., (1988), Katalyst and surfaces, Champman and Hall Ltd., London
6. De Pauw, 1975, Modeling and Optimation of Chatalitic Reforming process and Most Refinaries it is Used for Hydrocracking adn Hydrotryting, Dissertation of Texas Tech University.

7. Fogler,H.S., (2005), Elements of Chemical Reaction Engineering, 4th Edition, pp. 241-310, , Prentice-Hall International, Inc., New Jersey.
8. Hatch,L.F.,and Matars, S., (2000), From Hydrocarbons to Petrochemicals” second edition, pp. 24-40, Gulf Publishing Company, Houston.
9. Shui, H., Chen, Z., Wan, Z., Zhang, D., 2010. Kinetics of Shenhua coal liquefaction catalyzed by SO4/ZrO2solid acid, FUEL, Vol. 89, issue 1, pp. 67-72. In Univesity of Northumbria at Newcastle.
10. Jones, D.S.J., (1995), Elements of Petroleum Processing, pp. 275-278, John Willey & Sons, New York.
11. Bhutani , N., Ray, A.K., and Angaiah, G.P. (2006), Modeling, Simulation, and Multi-objective Optimization of an Industrial Hydrocracking Unit, Ind. Eng. Chem. Res., Vol. 45 (4), pp 1354–1372 .

12. Sarifudin,K., (2004), PengaruhRasio Ni/Mo dan Kandungan Nb2O5 terhadap Karakter, Aktivitas dan Selektivitas Katalis Ni-Mo/Nb2O5--Al2O3 dan Modifikasinya untuk Proses
Perengkahan Fraksi Aspalten dari Aspal Buton”, Master Tesis, Program Pasca Sarjana UGM, Yogyakarta (In: Bahasa Indonesia).
13. Speight, J.G., (2014), The Chemistry and Technology of Petroleum, vol 3, Fifth edition, pp 189-315, CRC Press.
14. Suryo P. and Murachman B., (2012), Teknologi Minyak Bumi, pp.146-150, Pasca Sarjana Universitas Gadjah Mada , Yogyakarta (In: Bahasa Indonesia).
15. Widayati, A., 2003, Rattan Cane Harvesting in Lambusango Forest, Buton, Indonesia : A Sustainable Practice or a Threat to Forest Conversation, Disertation