After sulphide removal is it possible to separate biogas (60% methane and 40% carbon dioxide) by increasing pressure?

10 October 2023 1 8K Report

I think carbon dioxide will liquify at pressure between 5 and 74 bar and temperature between -56 to 31 degC. At a pressure of 46 bar methane is a gas and above 46 bar it is in supercritical state.

Is it possible to do a gas liquid separation when methane is either in subcritical or supercritical state? But also retain the pressure in the separated methane gas product?

I am wondering if anyone has investigated this as an alternative method of biogas upgrading? where two products of carbon dioxide and methane are recovered as pressurized products to minimise energy loss?

Paul Milham

I don't know, but cooling and increasing pressures sounds energy intense. Might diffusion be more energy efficient?

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