High purity separation of n-pentane from neopentane using a nano-crystal of zeolite Y

新戊烷 沸石 戊烷 材料科学 分离(统计) 分离过程 Crystal(编程语言) 纳米尺度 热力学 物理 化学 分子 纳米技术 数学 催化作用 量子力学 色谱法 有机化学 统计 计算机科学 程序设计语言
作者
Shubhadeep Nag,G. Ananthakrishna,Prabal K. Maiti,S. Yashonath
出处
期刊:Journal of Chemical Physics [American Institute of Physics]
卷期号:155 (1) 被引量:3
标识
DOI:10.1063/5.0053081
摘要

A method for the separation of a mixture of n-pentane and neopentane using a nano-crystallite of zeolite Y is reported. This method judiciously combines two well-known, counter-intuitive phenomena, the levitation and the blowtorch effects. The result is that the two components are separated by being driven to the opposite ends of the zeolite column. The calculations are based on the non-equilibrium Monte Carlo method with moves from a region at one temperature to a region at another temperature. The necessary acceptance probability for such moves has been derived here on the basis of stationary solution of an inhomogeneous Fokker–Planck equation. Simulations have been carried out with a realistic and experimentally relevant Gaussian hot zone and also a square hot zone, both of which lead to very good separation. Simulations without the hot zones do not show any separation. The results are reported at a loading of 1 molecule per cage. The temperature of the hot zone is just ∼30 K higher than the ambient temperature. The separation factors of the order of 1017 are achieved using single crystals of zeolite, which are less than 1 μm long. The conditions for including the hot zone may be experimentally realizable in the future considering the rapid advances in nanoscale thermometry. The separation process is likely to be energetically more efficient by several orders of magnitude as compared to the existing methods of separation, making the method very green.
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