Kinetics and Selectivity of Asphaltene Thermal Cracking, Thermal Hydrocracking, and Catalytic Hydrocracking

作者：Zhang, S.; Zhao, Y.^*; Wei, F.

来源：Petroleum Science and Technology, 2011, 29(21): 2269-2281.

DOI：10.1080/10916466.2010.511381

• asphaltenes
• catalytic hydrocracking
• hydrocracking
• kinetics and selectivity
• thermal cracking

A pentane-insoluble asphaltene was processed by thermal cracking, thermal hydrocracking, and catalytic hydrocracking in a microbatch reactor at 430 degrees C. The experimental data of asphaltene conversion fit second-order kinetics adequately to give the apparent rate constants of 1.704 x 10(-2), 2.435 x 10(-2), and 9.360 x 10(-2) wt frac(-1) min(-1) for the above three cracking processes, respectively. A three-lump kinetic model is proposed and solved to obtain rate constants of parallel reactions of asphaltenes to produce liquid oil (k(1)) and gas coke (k(3)) and a consecutive reaction from liquid to gas coke (k(2)). The value of k(1) is 1.697 x 10(-2), 2.430 x 10(-2), and 9.355 x 10(-2) wt frac(-1) min(-1); k(2) is 3.605 x 10(-2), 2.426 x 10(-2), and 6.347 x 10(-3) min(-1); and k(3) is 6.934 x 10(-5), 5.416 x 10(-5), and 4.803 x 10(-5) wt frac(-1) min(-1) for asphaltenes thermal cracking, thermal hydrocracking, and catalytic hydrocracking, respectively. Analysis of selectivity shows that the catalytic hydrocracking process provides the highest liquid production, and the coking process provides the highest coke formation, as expected. An induction period of coke formation was found to increase from thermal cracking to thermal hydrocracking to catalytic hydrocracking process.

• 出版日期2011
• 单位浙江大学; 浙江大学宁波理工学院