Binary adsorption and desorption rates of propylene-propane mixtures on 13 X molecular sieves

Y.-H. Huang, A.I. Liapis, Y. Xu, O.K. Crosser, J.W. Johnson
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引用次数: 3

Abstract

The experimental adsorption and desorption rate data for pure propylene, pure propane, and propylene-propane mixtures on 13 X molecular sieves are presented for different temperatures and compositions; these rate data were efficiently determined using the differential sorption bed system described by Liapis et al. (Liapis et al. (1992) Rates and equilibria of adsorption and desorption of propane and propylene on 13 X molecular sieves determined experimentally using a differential sorption bed system. Sep. Technol. 2, 141–154). Propylene is the most preferentially adsorbed component, and the desorption rates of propylene and propane are slower than the adsorption rates. Mathematical models were constructed and solved, and it was found that the two-component model could provide a quantitative measure of the interactions between propylene and propane, and could describe the behavior of binary adsorption kinetics including the overshoot of the equilibrium loading by the less preferentially adsorbed propane. The theoretical results indicate that the desorption rates are not described by the same intracrystalline diffusion coefficients as the adsorption rates.

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丙烯-丙烷混合物在13x分子筛上的二元吸附和解吸速率
给出了不同温度和不同组分下纯丙烯、纯丙烷和丙烯-丙烷混合物在13x分子筛上的吸附和解吸速率的实验数据;这些速率数据是用Liapis et al. (Liapis et al.(1992))描述的微分吸附床系统有效地测定的。丙烷和丙烯在13x分子筛上吸附和解吸的速率和平衡是用微分吸附床系统实验测定的。科学通报2(9):1145 - 1154。丙烯是最优先吸附的组分,丙烯和丙烷的解吸速率比吸附速率慢。建立并求解了数学模型,发现双组分模型能够定量表征丙烯和丙烷的相互作用,并能描述二元吸附动力学行为,包括不优先吸附丙烷的平衡负荷超调。理论结果表明,解吸速率不像吸附速率那样由晶内扩散系数来描述。
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