Ammonia recovery device and recovery method

Details Ammonia recovery device and recovery method Ammonia recovery device and recovery method

C - Chemistry, Metallurgy

01

C

C01C 1/10 (2006.01) B01D 19/00 (2006.01) C01C 1/00 (2006.01) C02F 1/00 (2006.01)

Patent

CA 2717582

A method includes a first step of, with a C02.cndot.H2S stripper maintained to have a pressure higher than atmospheric pressure, from the ammonia-containing wastewater, discharging CO2 and H2S in a form of gas having a low moisture concentration from a tower top of the CO2.cndot.H2S stripper while discharging an ammonia- containing solution from a tower bottom of the CO2.cndot.H2S stripper; a second step of introducing the ammonia-containing solution obtained after the first step into an ammonia stripper which is maintained to have a lower pressure than that of the CO2.cndot.H2S stripper, and thereby discharging a gas rich in ammonia containing a small amount of H2S and CO2 from a tower top of the ammonia stripper while discharging water usable as industrial water from a tower bottom of the ammonia stripper; and a third step of introducing the ammonia rich gas obtained after the second step into a washing tower which is maintained to have a lower pressure than that of the ammonia stripper, and thereby discharging a wastewater containing a Na compound from a tower bottom of the washing tower while discharging a H2S-free gas rich in ammonia from a tower top of the washing tower.

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