Lumped reaction kinetic models for pyrolysis of heavy oil in the presence of supercritical water

Lumped reaction kinetic models for pyrolysis of heavy oil in the presence of supercritical water

Type	Journal Article
Author	Qing-Kun Liu
Author	Dao-Qi Zhu
URL	Free Full Text Source:  http://onlinelibrary.wiley.com/doi/10.1002/aic.14978/abstract
Volume	62
Issue	1
Pages	207-216
Publication	AIChE Journal
Date	January 1, 2016
Abstract	The reaction kinetics of the pyrolysis of heavy oil in the presence of supercritical water (SCW) and high pressure N2 were measured. At any reaction temperature applied, the pyrolysis under SCW environments is faster than that under N2 environments. Meanwhile, at lower temperatures the pyrolysis under both environments is accelerated by the introduction of coke into the feedstock. On the basis of a first-order four-lump reaction network consisting of the sequential condensation of maltenes and asphaltenes, the pyrolysis in whichever medium can be preferably described either by the lumped reaction kinetic model modified with autocatalysis and pseudoequilibrium or by the model modified solely with pseudoequilibrium. Benefited from the reduced limitation of diffusion to reaction kinetics, the pyrolysis in the SCW phase is more sensitive to the increase in reaction temperature than that in the oil phase, disengaging readily from the dependence on autocatalysis at a lower temperature.