Abstract
Biogas upgrading is one piece in the framework of future energy supply. Commonly absorption and adsorption technology is applied for biogas upgrading where CO2, H2S, and water vapor have to be removed from CH4. Gas permeation technology offers an interesting alternative to conventional upgrading techniques. Combining gas permeation membranes and conventional separation equipment in membrane hybrid processes merges the advantages of both technologies. Hence, we analyze seven different membrane hybrid processes for biogas upgrading. A single gas permeation stage is combined with pressurized water scrubbing, amine absorption, cryogenic separation, and a particular process in which the permeate of the gas permeation stage drives a gas engine. Furthermore, we compare the specific upgrading costs to an individual three stage membrane process as well as to conventional separation processes. Simulation studies were performed in Aspen Plus to rigorously model the different hybrid process configurations. A full cos...
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