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Precipitation, fractionation and characterization of asphaltenes from heavy and light crude oils |
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| Authors: | F Trejo G Centeno J Ancheyta |
| Affiliation: | a Programa de Tratamiento de Crudo Maya, Instituto Mexicano del Petróleo, Eje Central Lázaro Cárdenas 152, Col. San Bartolo, Atepehuacan, DF 07730 México, Mexico b Facultad de Química, UNAM, Ciudad Universitaria, DF 04510 México DF, Mexico c Instituto Tecnológico de Ciudad Madero, Juventino Rosas y Jesús Urueta, Col. Los Mangos, Cd. Madero, Tamps., 89440 México, Mexico |
| Abstract: | Asphaltenes of Maya and Isthmus crude oils were precipitated, fractionated and characterized in this work. Isolation of asphaltenes was performed by following the ASTM D3279 method, which uses n-heptane for solvent precipitation. Asphaltenes were separated into three fractions by Soxhlet extraction with a binary solvent system of toluene and n-heptane. C, H, O, N, S, and Ni and V contents were determined in asphaltenes and in their fractions by elemental analysis and atomic absorption, respectively. VPO aggregate weight and NMR measurements were also performed in all samples. Important differences in properties of unfractionated asphaltenes and asphaltenes fractions were observed. Some of these differences were attributed to impurities in the unfractionated asphaltenes. |
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