(768g) Effect of Coke Solubility on Product Yield on the Ethylene Oligomerization Under Supercritical Conditions
AIChE Annual Meeting
2019 AIChE Annual Meeting
Catalysis and Reaction Engineering Division
Reactions in Near-Critical and Supercritical Fluids
Friday, November 15, 2019 - 2:12pm to 2:29pm
In this talk, we will report results with n-decane, n-tetradecane, ethylcyclohexane, dimethylcyclohexane, and cyclooctane as model compounds to simulate the coke formed during the ethylene oligomerization over the Ni-H-Beta catalyst under supercritical conditions. Additionally, we will report the use of naphthalene to mimic the coke formed over heterogeneous catalysts in other reaction systems, such as pyrolysis and petrochemical processes. We propose a flow system to study the solubility of these compounds under ethylene and nitrogen. To ensure that the system is under equilibrium we successfully replicated the solubility data produced by Diepen and Prausnitz.â We also show that the flow rates do not affect the equilibrium under the conditions used for the solubility experiment. The core of this work consists on the development of a thermodynamic model coupled with equations of state (EOS), such as Virial, Peng-Robinson, and Soave-Redlich-Kwong, which will be validated using the experimental results. Our results are in agreement with the literature and indicate that ethylene is able to dissolve more heavy hydrocarbons than nitrogen, especially under supercritical conditions. We used the experimental solubility data to calculate the binary interaction parameters for the gas-liquid mixtures studied in the present work. These results help to explain the effects of the solubility of coke by the supercritical ethylene on the kinetics for the ethylene oligomerization under supercritical conditions.
 G. A. M. Diepen and F. E. C. Scheffer, âThe Solubility of Naphthalene in Supercritical Ethylene,â J. Am. Chem. Soc., vol. 70, no. 12, pp. 4085â4089, 1948.
 J. M. Prausnitz and P. R. Benson, âSolubility of liquids in compressed hydrogen, nitrogen, and carbon dioxide,â AIChE J., vol. 5, no. 2, 1959.
 S. G. D. Avila, B. K. Kaul, and J. M. Prausnitz, âSolubilities of Heavy Hydrocarbons in Compressed Methane and Nitrogen,â vol. 21, no. 4, pp. 488â491, 1976.
 G. V. S. Seufitelli and F. L. P. Resende, âStudy of the catalytic reactions of ethylene oligomerization in subcritical and supercritical media over a NiBEA catalyst,â Appl. Catal. A Gen., vol. 576, pp. 96â107, 2019.