Method for separating off carbon dioxide in biogas plants
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United States of America Patent
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Jul 7, 2015
Grant Date -
Feb 27, 2014
app pub date -
Oct 5, 2011
filing date -
Oct 8, 2010
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Abstract
A method for separating off carbon dioxide in biogas plants includes an adsorption phase and a regeneration phase. Crude biogas that is treated in the adsorption phase is passed at ambient pressure through an adsorber suitable for adsorption of carbon dioxide, and in the regeneration phase the adsorber is regenerated with a purge gas at the temperature between 20 and 100° C., and also ambient pressure. The crude biogas is treated upstream of the carbon dioxide separation method, and is desulphurized and dried and minor components can be removed. For avoiding impurities in the biogas, at the start of the adsorption phase a purge process is carried out on the adsorber with treated crude biogas, wherein the purge process is controlled with respect to time via a number of valves and a sensor.
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