Restrictive diffusion under hydrotreating reactions of heavy residue oils in a trickle bed reactor

Journal Article · Sun Aug 01 04:00:00 EDT 1993 · Industrial and Engineering Chemistry Research; (United States)

DOI:https://doi.org/10.1021/ie00020a011· OSTI ID:5815886

Tsai, Mingchang; Chen, Yuwen ^[1]; Li, Chiuping ^[2]

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

The effect of the ratio of reactant molecular diameter to catalyst pore diameter on the restrictive diffusion under hydrotreating reactions of heavy residue oils over CoMo/alumina-aluminum 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 results showed that the restrictive effect under reaction conditions is still severe. The values of the effective diffusivities and the relevant effectiveness factors for hydrodesulfurization (HDS) and hydrodemetalation (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.

• OSTI ID: 5815886
• Journal Information: Industrial and Engineering Chemistry Research; (United States), Journal Name: Industrial and Engineering Chemistry Research; (United States) Vol. 32:8; ISSN IECRED; ISSN 0888-5885
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020400* -- Petroleum-- Processing
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
ALUMINIUM PHOSPHATES
CATALYSTS
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMICAL REACTORS
COBALT
DEMETALLIZATION
DESULFURIZATION
DIFFUSION
ELEMENTS
ENERGY SOURCES
FOSSIL FUELS
FUELS
METALS
MICROSTRUCTURE
MOLYBDENUM
OXIDES
OXYGEN COMPOUNDS
PETROLEUM
PETROLEUM FRACTIONS
PETROLEUM RESIDUES
PHOSPHATES
PHOSPHORUS COMPOUNDS
PORE STRUCTURE
SEPARATION PROCESSES
TRANSITION ELEMENTS