Viscosity Reduction and Upgrading of Athabasca Oilsands Bitumen by Natural Zeolite Cracking

Authors: Abu S.M. Junaid, Wei Wang, Christopher Street, Moshfiqur Rahman, Matt Gersbach, Sarah Zhou, William McCaffrey, Steven M. Kuznicki

Abstract:

Oilsands bitumen is an extremely important source of energy for North America. However, due to the presence of large molecules such as asphaltenes, the density and viscosity of the bitumen recovered from these sands are much higher than those of conventional crude oil. As a result the extracted bitumen has to be diluted with expensive solvents, or thermochemically upgraded in large, capital-intensive conventional upgrading facilities prior to pipeline transport. This study demonstrates that globally abundant natural zeolites such as clinoptilolite from Saint Clouds, New Mexico and Ca-chabazite from Bowie, Arizona can be used as very effective reagents for cracking and visbreaking of oilsands bitumen. Natural zeolite cracked oilsands bitumen products are highly recoverable (up to ~ 83%) using light hydrocarbons such as pentane, which indicates substantial conversion of heavier fractions to lighter components. The resultant liquid products are much less viscous, and have lighter product distribution compared to those produced from pure thermal treatment. These natural minerals impart similar effect on industrially extracted Athabasca bitumen.

Keywords: Natural Zeolites, Oilsands Bitumen, Cracking, Viscosity Reduction, Upgrading.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1083847

References:

[1] C.L. Thomas, "A History of Early Catalytic Cracking Research at Universal Oil Products Company," in B.H. Davis and W.P. Hettinger (eds.), Heterogeneous Catalysis: Selected American Histories, ACS Symposium Series, Series 222, pp. 241-245, American Chemical Society, Washington DC, 1983.
[2] S.M. Kuznicki , W.C. McCaffrey, J. Bian , E. Wangen, A. Koenig, and C.H. Lin, "Natural zeolite bitumen cracking and upgrading," Micropor. Mesopor. Mater., vol. 105, no. 3, pp. 268-272, Jul. 2007.
[3] Alberta Chamber of Resources, "Oil sands technology roadmap," 2004, online: http://www.acr-alberta.com/ostr/OSTR_report.pdf, retrieved on Apr. 15, 2008.
[4] A.S.M. Junaid, H. Yin, A. Koenig, J. Choudhury, G. Burland, W.C. McCaffrey, and S.M. Kuznicki, "Natural zeolite catalyzed crackingassisted light hydrocarbon extraction of bitumen from Athabasca oilsands, Appl. Catal. A: Gen., vol. 354, no. 1-2, pp. 44-49, Feb. 2009.
[5] N.A. Hernández-Beltrán, M.T. Olguín, "Elemental composition variability of clinoptilolite-rich tuff after the treatment with acid phosphate solutions," Hydrometallurgy, vol. 89, No. 3-4, pp. 374-378, Dec. 2007.
[6] American Society for Testing and Materials, Standard Test Method for Characteristic Groups in Rubber Extender and Processing Oils and Other Petroleum-Derived Oils by the Clay-Gel Absorption Chromatographic Method (ASTM D2007M), 2003.
[7] Standard test method for low temperature, low shear rate, viscosity/temperature dependence of lubricating oils using a temperature-scanning technique. ASTM D 5133, 2005.
[8] A. Casalini, A. Mascherpa, and C. Vecchi. "Modifications induced by visbreaking on composition and structure of atmospheric residues," Fuel Sci Technol Inter., vol. 8, No. 4, pp. 427-445, 1990.
[9] F. Khorasheh and M.R. Gray, "High-pressure thermal cracking of nhexadecane," Ind Eng Chem Res., vol. 32, No. 9, pp. 1853-1863, Sep. 1993.
[10] F. Ding , S.H. Ng, C. Xu, and S. Yui, "Reduction of light oil catalytic cracking of bitumen-derived crude HGOs through catalytic selection", Fuel Process. Technol., vol. 88, No. 9, 833-845, Sep. 2007.
[11] S. Ng, Y. Zhu, A. Humpries, L. Zheng, F. Ding, T. Gentzis, J. Charland, and S. Yui, "FCC study of Canadian oil-sands derived vacuum gas oils: 1. Feed and catalyst effects on yield structure," Energy Fuels, vol. 16, No. 5, pp. 1196-1208, Jul. 2002.
[12] C.S. Peter and L.L. Robert, "An experimental investigation of viscous heating in some simple shear flows," AIChE Journal, vol. 20, No. 3, pp. 474-484, May 1974.