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US 4,381,926 AGranted
Method and apparatus for regulating ammonia concentration during scrubbing of gaseous mixtures
AssigneeLinde Aktiengesellschaft
InventorHeinz Karwat
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AssigneeLinde Aktiengesellschaft
InventorHeinz Karwat
Estimating the term…
Methods and apparatus for scrubbing gaseous mixtures containing ammonia are disclosed in which the gaseous mixtures are contacted with methanol in a scrubbing column to remove any acidic gases therefrom, the methanol is separated from the acidic gases and recirculated, and at least a portion of the methanol is contacted with an ion exchange material so as to remove at least a portion of the ammonia therefrom. In one embodiment of the invention, the method and apparatus also includes addition of methanol to the gaseous mixture prior to contacting in the scrubbing column so as to produce a methanol-water mixture with any water contained in the gaseous mixture and prevent the icing thereof, and includes separating the methanol-water mixture from the gaseous mixture prior to contacting with the scrubbing column as well as separating the methanol from the water and recirculating the methanol.
A method for scrubbing gaseous mixtures containing ammonia and acidic gases which comprises contacting said gaseous mixture with methanol in a scrubbing column so as to remove a portion of said acidic gases therefrom and produce a methanol stream containing at least a portion of said ammonia, separating said methanol stream containing said at least a portion of said ammonia from said acidic gases, contacting at least a portion of said methanol stream with an ion exchange material so as to remove at least a portion of said ammonia therefrom, and recirculating said methanol stream to said scrubbing column.
Apparatus for scrubbing gaseous mixtures containing ammonia and acidic gases comprising a scrubbing column for contacting said gaseous mixtures with methanol so as to remove a portion of said acidic gases from said gaseous mixture and produce a methanol stream containing at least a portion of said ammonia, a methanol recovery column for separating said methanol stream containing said at least a portion of said ammonia from said acidic gases, first methanol delivery means for delivering said methanol stream containing said at least a portion of said ammonia from said scrubbing column to said methanol recovery column, ion exchange means for contacting at least a portion of said methanol stream with an ion exchange material so as to remove at least a portion of said ammonia therefrom, second methane means for delivery means for delivering said methanol stream containing said at least a portion of said ammonia from said methanol recovery column to said ion exchange means, and recirculation means for recirculating said separated methanol to said scrubbing column.
Dependencies are inferred from the claim text.