Configurational diffusion of asphaltenes in fresh and aged catalyst extrudates. Quarterly progress report, December 20, 1994--March 20, 1995

摘要

This quarter, GPC column efficiency and resolution were tested. Better resolution and separation of petroleum asphaltenes were obtained in GPC by connecting four columns (1000(Angstrom), 1000(Angstrom), 500(Angstrom), 500(Angstrom) pore sizes, respectively) in series. A good linear column calibration curve was obtained using several polystyrene standards with molecular weights ranging from 500 to 5 (times) 10(sup 4). The molecular weight distribution of a petroleum asphaltenes was approximated by the polystyrene calibration curve.