Narrow Fraction Model with Secondary Cracking for Low-Severity Thermal Cracking of Heavy Oil

Energy Fuels, 2012, 26 (6), pp 3628–3633

Narrow Fraction Model with Secondary Cracking for Low-Severity Thermal Cracking of Heavy Oil

Junwei Yang, Dongxiao Chen, Guoping Shen, Jiazhi Xiao*, and Chaohe Yang

xiaojz@upc.edu.cn

State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Qingdao 266555, People’s Republic of China

Abstract

Describes thermal reaction experiments of vacuum residuum, conducted in a micro-batch reactor at 410–480 °C. The product yield variation with time indicated that the secondary cracking reaction mainly occurs in the heavy fraction of the liquid product.

Authors develop a narrow fraction model for low-severity thermal cracking of heavy oil, with the secondary reaction taken into account.  A pseudo-lump, defined as the fraction generated from the secondary cracking reaction of the heavy fraction (420–540 °C) is introduced to simplify the reaction network.  Also employed is a sequential method to estimate rate constants in complex models.  The kinetic parameters were estimated by Arrhenius’ law. The model-predicted lump yields agreed well with the experimental values.

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