Research on the Kinetics and Controlling Factors for Oil Cracking
Received date: 2010-08-15
Revised date: 2010-09-08
Online published: 2011-04-10
This paper studied the kinetics and controlling factors for oil cracking process by gold-tube pyrolysis experiments. Yields analysis of the gas hydrocarbons generated from pyrolysis of HD11 crude oils indicated that the yields of total gas and methane increased with the heating process, while a sudden decrease occurred following an initial increase for that of
C2-5due to their subsequent cracking. The average active energy and frequency factor A for total cracking reaction of HD11 crude were calculated to be 59.8 kcal/mol（250.0 kJ/mol）and 2.13 ×1013 s-1separately. GC-MS analysis results revealed that the relative stability of different fractions varied and larger organic molecular seemd to be more readily cracked. Meanwhile, results of a series control experiments and former works demonstrated that potential factors, involving pressure, water and clay minerals, could affect or even dominate the cracking of oils. Despite working in different mechanism, both high pressure and the presence of water could inhibit the free radical reactions and consequently promote the stability of oils. On the contrary, clays, especially montmorillonite or illite\|smectite (I/S), could avail the cracking of oils or hydrocarbons due to the catalysis initiated by their surface acid sites. Furthermore, it was substantiated that there was a positive relation between the catalytic effects of gases with the strength of Brnsted acids on clays.
Key words： Oil\; cracking gas; Gold-tube pyrolysis; Kinetics; Pressure; Water; Clay minerals
HE Kun, ZHANG Shui-Chang, MI Jing-Kui . Research on the Kinetics and Controlling Factors for Oil Cracking[J]. Natural Gas Geoscience, 2011 , 22(2) : 211 -218 . DOI: 10.11764/j.issn.1672-1926.2011.02.211
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