Chemistry of inorganic compounds – Nitrogen or compound thereof – Ammonia or ammonium hydroxide
Reexamination Certificate
2009-10-09
2011-12-27
Mayes, Melvin (Department: 1732)
Chemistry of inorganic compounds
Nitrogen or compound thereof
Ammonia or ammonium hydroxide
C423S239100, C252S193000
Reexamination Certificate
active
08084008
ABSTRACT:
A process for saturating a material capable of binding ammonia by ad- or absorption and initially free of ammonia or partially saturated with ammonia comprises treating said material under a pressure and associated temperature located on the vapor pressure curve of ammonia with an amount of liquid ammonia sufficient to saturate said material and an additional amount of a cooling agent selected from liquid ammonia, liquid or solid CO2, hydrocarbons and hydrohalocarbons that have a higher vapor pressure than ammonia, ethyl ether, methyl formate, methyl amine and ethyl amine, such that |Qabs|≦|Qevap|+Qext, wherein Qabsis the amount of heat released from said material when it absorbs ammonia from the liquid phase thereof to the point where it is saturated with ammonia, Qevapis the amount of heat absorbed by said cooling agent when it evaporates, and Qextis the amount of heat exchanged with the surroundings and is positive, if heat is removed from the process by external cooling, and negative, if heat is added to the process from the surroundings.
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Bates, A.R. et al., “Elastic and Thermodynamic behavior at the phase transitions of some hexa-ammine metal (II) complexes,” J. of Phys. C: Solid State Phys., vol. 16 (1983) pp. 2847-2859.
Johannessen Tue
Johansen Johnny
Quaade Ulrich J.
Svagin Jakob
Wagner-Pedersen Henrik
Amminex A/S
Davis Sheng H
Frost Brown Todd LLC
Goldstein Steven J.
Mayes Melvin
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