Chemistry of inorganic compounds – Nitrogen or compound thereof – Ammonia or ammonium hydroxide
Reexamination Certificate
2005-01-04
2005-01-04
Silverman, Stanley S. (Department: 1754)
Chemistry of inorganic compounds
Nitrogen or compound thereof
Ammonia or ammonium hydroxide
C210S269000, C210S674000, C210S681000, C423S238000, C423S517000
Reexamination Certificate
active
06838069
ABSTRACT:
Apparatus, materials, and methods for removing ammonia from fluid using metal hydroxides (e.g. zinc hydroxide) and metal cation loaded media (e.g. zinc loaded ion exchange resins); the metal hydroxides and metal cation loaded media may be regenerated with a weak acid (pKabetween 3 and 7). Alternatively, ammonia is removed from fluids by using H2SO4and ZnSO4and metal cation loaded media; the metal cation loaded media may be regenerated with H2SO4and ZnSO4; the ammonia containing H2SO4and H2SO4may be concentrated as necessary to form (NH4)2SO4.ZnSO4.6H2O (ammonium zinc sulfate hexahydrate) crystals. These crystals are removed from the mother liquor and heated to temperatures exceeding 200° C. releasing NH3and H2O vapor upon the decomposition of the crystals.
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Blonigen Scott J.
Fassbender Alex G.
Litt Robert D.
Monzyk Bruce F.
Neff Richelle
Battelle (Memorial Institute)
Silverman Stanley S.
Strickland Jonas N.
Wiesmann Klaus H.
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