Method and plant for treating crude gas, in particular biogas, containing methane and carbon dioxide in order to produce methane
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United States of America Patent
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Aug 6, 2013
Grant Date -
Feb 11, 2010
app pub date -
Jan 25, 2008
filing date -
Jan 30, 2007
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Abstract
A method for treating crude gas, in particular biogas, containing methane and carbon dioxide, in order to produce methane, and a plant suitable for carrying out the method. The method includes (a) washing the crude gas with an amine-containing washing solution, thereby forming a pure gas stream of methane and water, from which water is separated by subsequent cooling and condensation; (b) compressing and heating the washing solution containing CO2 and sulfur compounds and expanding the washing solution in a first expansion stage, during a secondary reaction time of 280 to 1200 seconds and at a constant reaction temperature; (c) cooling the purified washing solution and expanding it in a second expansion stage to normal pressure, whereupon any residual amounts of soluble CO2 and sulfur compounds are separated and the completely purified washing solution is cooled to normal temperature and returned to the washing stage.
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