A process for the separation or concentration of olefinic hydrocarbons from mixtures of olefinic and paraffinic hydrocarbons uses a polyimide membrane, The process is well suited to separating propylene from propylene/propane mixtures. The novel method the membrane exhibits good resistance to plasticization by hydrocarbon components in the gas mixture under practical industrial process conditions.

 
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< Simulated moving bed adsorptive separation process for preventing increase in pressure drop and system thereof

> Fischer-tropsch wax composition and method of transport

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