Abstract

GOMES, Luis Miguel; ESCALANTE, Alfredo  and  BOUZA, Alexis. Effect of feed vaporization in hydrocracking reactors. Rev. Fac. Ing. UCV [online]. 2015, vol.30, n.1, pp.157-170. ISSN 0798-4065.

In this work, a study of the effect of feed vaporization in hydrocracking reactors was made. Three different ways for modeling the reactor were implemented: reaction in liquid phase without considering feed vaporization, reaction in liquid phase accounting for hydrocarbons vaporization and finally, reaction in liquid and vapor phases accounting for hydrocarbons vaporization. In the models, vaporization was taken into account by calculating it in each reaction step and it was merged with the plug flow reactor model (PFR). The kinetic model utilized was proposed by Botchwey and uses four pseudo components (A, B, C and D) and for accounting the feed vaporization, the Peng-Robinson equation of state was utilized. The different schemes were validated using available experimental data for four temperatures (390, 410, 430 y 450 °C) and six spatial velocities (0.5, 1, 1.5, 2, 2.5 and 3 h^-1). For temperatures from 390 to 430 °C, the minimal error obtained was 5.31% for the model with reaction in both phases and feed vaporization. For the highest temperature (450 °C), thermolysis and cracking reactions that are not present at lower temperatures occur, which are not reproducible using the reaction scheme employed in this work.

Keywords : Hydrocracking; Vaporization; Peng-Robinson; Botchwey; Reactor.

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