Relating Feedstock Composition to Product Slate and Composition in Catalytic Cracking. 6. Feedstocks Derived from Merey, a Venezuelan Crude

Abstract

The fluid catalytic cracking (FCC) behavior of compound types present in the >650 °F resid from Merey crude was investigated. Distillation and liquid chromatography were used to separate selected compound-type fractions from the resid; the resulting fractions were then cracked using a benchscale FCC unit. The FCC behavior for each compound type was defined in terms of the resulting product distribution (yields of gas, gasoline, etc.); sulfur, nitrogen, nickel, and vanadium partitioning; and, in selected cases, gasoline composition. Results obtained from the Merey fractions were compared to those obtained from earlier FCC studies of compound types from Lagomedio (Venezuelan), Wilmington (Californian), Maya (Mexican), and Brass River (Nigerian) >650 °F resids. Correlations using the five sets of data were developed for light gas, light cycle oil, and heavy cycle oil, as a function of five feed parameters (metals, microcarbon residue, sulfur, basic nitrogen, and hydrogen contents). The correlations are consistent with the data and have a standard error of 2 wt %.

Prediction of the FCC Feedstocks Crackability

“…The relation between the reaction parameters from the three-lump models and the ratio aromatic carbon published by Voltz, Nace, & Weekman, (1971) and Ancheyta, López, & Aguilar, (1998) respectively, coincide with the conclusions of Fisher (1990) and Lerner, & Himpsl (1997). Sheppard, Al-Alloush, Green, Zagula, Young, & Wisecarver (2003) used the hydrogen to carbon plus sulfur ratio as a key factor of gasoline yield, corrected by hydrocarbon and sulfur compounds that boil below the reaction temperature (determined by mass spectroscopy studies) and affected by total nitrogen and metals. The coke yield was expressed in function of the residual microcarbon content (MCR) and on exponential equation of basic nitrogen, sulfur, and metals.…”