Highly restrictive diffusion under hydrotreating reactions of heavy residue oils

Journal Article · Wed Mar 01 04:00:00 EST 1995 · Industrial and Engineering Chemistry Research

DOI:https://doi.org/10.1021/ie00042a024· OSTI ID:63304

Li, C ^[1]; Chen, Y W; Tsai, M C ^[2]

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1. Chinese Petroleum Corp., Chia-Yi (Taiwan, Province of China). Refining and Manufacturing Research Center
2. National Central Univ., Chung-Li (Taiwan, Province of China). Dept. of Chemical Engineering

The effect of the ratio ({lambda}) of reactant molecular diameter to catalyst pore diameter on the restrictive diffusion under a highly restrictive regime of hydrotreating reactions of heavy residue oils over CoMo/alumina-alumina phosphate catalysts was investigated. Hydrotreating reactions of residual oils were carried out in a trickle bed reactor at 663 K and 7.6 MPa over a series of CoMo/alumina-aluminum phosphate catalysts. The values of the effective diffusivities and the relevant effectiveness factors for HDS and HDM reactions were determined by applying the Thiele relation to catalytic reactions. The effective diffusivities for the HDM reaction are always smaller than those for the HDS reaction. In addition, the effective diffusivity values decreased with increasing ratios of reactant molecular diameters to catalyst pore diameters for both HDS and HDM reactions, indicating a large restrictive diffusion effect. Two different regimes for restrictive diffusion were observed. The restrictive effect under reaction conditions is still severe for low values of {lambda}. However, this effect does not seem prominent for high values of {lambda}

• Sponsoring Organization: USDOE
• OSTI ID: 63304
• Journal Information: Industrial and Engineering Chemistry Research, Journal Name: Industrial and Engineering Chemistry Research Journal Issue: 3 Vol. 34; ISSN IECRED; ISSN 0888-5885
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
ALUMINIUM OXIDES
ALUMINIUM PHOSPHATES
CATALYSTS
CATALYTIC EFFECTS
CHEMICAL REACTION KINETICS
COBALT
DEMETALLIZATION
DESULFURIZATION
DIFFUSION
EXPERIMENTAL DATA
MOLYBDENUM
PERMEABILITY
PORE STRUCTURE
RESIDUAL FUELS