Abstract: An ammonia chemical species desorption process desorbs ammonia chemical species adsorbed onto a Prussian blue derivative more simply at lower cost under milder conditions as compared with using an aqueous solution of a salt or strong acid, and only water. This ammonia chemical species desorption process includes an ammonia chemical desorption step of bringing carbon dioxide and water into contact with a Prussian blue derivative represented by the following general formula (1), thereby desorbing an ammonia chemical species. AxM[M?(CN)6]y·zH2O??(1) where x is 0 to 3, y is 0.1 to 1.5, z is 0 to 6, A is at least one cation of hydrogen, ammonium, an alkaline metal, and an alkaline earth metal, and M and M? are each independently at least one cation of at least one of atoms having atomic numbers 3 to 83 except for ammonium, an alkali metal, and an alkaline earth metal.

Abstract: The purpose of the present invention is to provide a granulation adsorbent having high strength and in particular stability in water that ensures certain throughputs at low costs. The granulated adsorbent of the invention comprises a metal-cyano complex as an effective component, a flocculation precipitant for flocculation precipitation of the metal-cyano complex from slurry containing the metal-cyano complex, a binder, and a crosslinking agent. The granulated adsorbent is produced by a step of adding the flocculation precipitant to the metal-cyano complex slurry and then dehydrating the metal-cyano complex slurry to prepare a metal-cyano complex dehydrated cake, a step of heat drying the metal-cyano complex dehydrated cake to prepare a metal-cyano complex dried block, a step of pulverizing the metal-cyano complex dried block into metal-cyano complex powder, and a step of preparing a mixture containing the metal-cyano complex powder, binder and crosslinking agent, and then granulating using the mixture.

Abstract: An ammonia chemical species desorption process desorbs ammonia chemical species adsorbed onto a Prussian blue derivative more simply at lower cost under milder conditions as compared with using an aqueous solution of a salt or strong acid, and only water. This ammonia chemical species desorption process includes an ammonia chemical desorption step of bringing carbon dioxide and water into contact with a Prussian blue derivative represented by the following general formula (1), thereby desorbing an ammonia chemical species. AxM[M?(CN)6]y.zH2O??(1) where x is 0 to 3, y is 0.1 to 1.5, z is 0 to 6, A is at least one cation of hydrogen, ammonium, an alkaline metal, and an alkaline earth metal, and M and M? are each independently at least one cation of at least one of atoms having atomic numbers 3 to 83 except for ammonium, an alkali metal, and an alkaline earth metal.