Highly efficient helium purification through a dual-membrane system: insights from molecular dynamics simulations.

Almost all helium is resourced from natural gas reservoirs. Hence, it is essential to develop new efficient technologies to recover helium from natural gas. In this work, we propose a novel dual membrane system, consisting of CN (M1) and graphdiyne (M2) membranes, to separate and purify helium from a ternary gas mixture of He/N/CH.

Efficient separation of He/CH mixture by functionalized graphenylene membranes: A theoretical study.

In this work, we prepared two types of functionalized pore on pristine graphenylene membrane to study and compare the He/CH separation performance employing molecular dynamics (MD) simulation. The gas molecules transport through the membranes was monitored during the simulations. The results indicated that methane molecules cannot pass through the membranes under applied conditions, while helium molecules simply penetrate through, which verifies the ultrahigh selectivity of helium over methane molecules.