Simulation of the separation of a helium-methane mixture in a flat membrane module.

The problem of the membrane separation of a helium-methane mixture containing 0.1 wt % He, which imitates the composition of a helium-rich natural gas field, has been numerically analyzed. The helium and methane flux distribution along the length of a flat-sheet membrane module have been calculated. The distribution of the average mass concentration of helium in the channels is presented. The gas pumping expenditures have been estimated. The optimal working parameters of the gas mixture have been determined. Heating the mixture above 400 K does not enhance the helium-methane separation efficiency. [ABSTRACT FROM AUTHOR]