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Kinetics of asphaltene thermal cracking and catalytic hydrocracking
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DOI：10.1016/j.fuproc.2010.12.019.png)
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Abstract
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A pentane-insoluble asphaltene was processed by thermal cracking and catalytic hydrocracking over NiMo/gamma-Al2O3 in a microbatch reactor at 430 degrees C. Kinetic analysis shows that the first-order kinetics fits the data of conversion in reaction times <= 30 min approximately, but deviates from the data of times over 30 min significantly; whereas the second-order kinetics fits the data of the reaction times up to 60 min adequately, to give the apparent rate constants of 1.704 x 10(-2) and 9.360 x 10(-2) wt frac(-1)min(-1) for the two cracking processes. Furthermore, a three-lump kinetic model is proposed to include parallel reactions of asphaltenes to produce liquid oil (k(1),) and gas + coke (k(3)). and consecutive reaction from liquid to gas + coke (k(2)). The evaluated value of k(1), is 1.697 x 10(-2) and 9.355 x 10(-2) wt frac(-1)min(-1), k(2) is 3.605x 10(-2) and 6.347 x 10(-3) min(,)(-1) and k(3) is 6.934 x 10(-5) and 4.803 x 10(-5) wt frac(-1)min(-1) for asphaltenes thermal cracking and catalytic hydrocracking. respectively. Selectivity analysis shows that the catalytic hydrocracking process promotes liquid production and inhibits coke formation effectively. (c) 2011 Elsevier B.V. All rights reserved.
Keywords:
Asphaltenes
Thermal cracking
Catalytic hydrocracking
Kinetics
Selectivity
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