Hydroprocessing of a Maya Residue. Intrinsic Kinetics of Sulfur-, Nitrogen-, Nickel-, and Vanadium-Removal Reactions
1999; American Chemical Society; Volume: 13; Issue: 3 Linguagem: Inglês
10.1021/ef980166+
ISSN1520-5029
AutoresMaría A. Callejas, María T. Martinez,
Tópico(s)Metal Extraction and Bioleaching
ResumoA residue from a Maya crude was processed in a hydrotreating unit with a continuous stirred tank reactor at high temperatures (375−415 °C) and hydrogen pressures (10−15 MPa). A commercial guard-bed demetalation catalyst Ni−Mo supported on γ-Al2O3 was used. In this paper, the intrinsic kinetics of the sulfur-, nitrogen-, nickel-, and vanadium-removal reactions are reported. The sulfur-removal reactions fit second-order kinetics, the nitrogen-removal reactions half-order kinetics, the nickel-removal reactions first-order kinetics, and the vanadium-removal reactions half-order kinetics. The nickel-removal reactions showed the highest value for the activation energy. The sulfur-removal reactions were the only ones that had a dependence on the hydrogen pressure in every range of hydrogen pressures studied, 10−15 MPa, and a kinetic order of 0.4 has been observed. For nitrogen-, nickel-, and vanadium-removal reactions, an increase of the pseudokinetic constants was only observed between 10 and 12.5 MPa. The perc...
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