Chemistry of inorganic compounds – Nitrogen or compound thereof – Ammonia or ammonium hydroxide
Reexamination Certificate
2006-03-07
2006-03-07
Davis, Brian (Department: 1621)
Chemistry of inorganic compounds
Nitrogen or compound thereof
Ammonia or ammonium hydroxide
C564S488000
Reexamination Certificate
active
07008603
ABSTRACT:
Processes and apparatus for quantitatively converting urea to ammonia on demand are disclosed. One process includes the steps of: receiving a demand rate signal for ammonia; feeding reactants including urea and water into a reactor to provide a reaction mixture; and controlling temperature and pressure in the reactor to produce a gaseous product stream including ammonia and carbon dioxide at substantially constant concentrations. Another process includes the steps of: feeding molten urea or solid urea to a reactor; feeding water (liquid or steam) to the reactor; and reacting the urea and water at elevated temperature and pressure to form a gaseous product stream including ammonia and carbon dioxide.
REFERENCES:
patent: 3826815 (1974-07-01), Mavrovic
patent: 3900554 (1975-08-01), Lyon
patent: 3922222 (1975-11-01), Van Moorsel
patent: 4087513 (1978-05-01), Schell
patent: 4168299 (1979-09-01), Schell
patent: 4208386 (1980-06-01), Arand et al.
patent: 4220632 (1980-09-01), Pence et al.
patent: 4220635 (1980-09-01), Schell
patent: 4231960 (1980-11-01), Schmidt
patent: 4308385 (1981-12-01), Goorden
patent: 4314077 (1982-02-01), Zardi et al.
patent: 4325924 (1982-04-01), Arand et al.
patent: 4341640 (1982-07-01), Landis
patent: 4410503 (1983-10-01), van Nassau et al.
patent: 4456535 (1984-06-01), Zuidam et al.
patent: 4533364 (1985-08-01), Altman et al.
patent: 4552979 (1985-11-01), Stokes
patent: 4652678 (1987-03-01), Douwes
patent: 4731233 (1988-03-01), Thompson et al.
patent: 5034030 (1991-07-01), Miller et al.
patent: 5058514 (1991-10-01), Mozes et al.
patent: 5096599 (1992-03-01), Granelli
patent: 5098680 (1992-03-01), Fellows et al.
patent: 5223238 (1993-06-01), Czuppon
patent: 5240688 (1993-08-01), von Harpe et al.
patent: 5252308 (1993-10-01), Young
patent: 5262138 (1993-11-01), Young
patent: 5281403 (1994-01-01), Jones
patent: 5399755 (1995-03-01), Lagana'
patent: 5489420 (1996-02-01), Diep
patent: 5543123 (1996-08-01), Hofmann et al.
patent: 5567226 (1996-10-01), Lookman et al.
patent: 5827490 (1998-10-01), Jones
patent: 5974789 (1999-11-01), Mathes et al.
patent: 5985222 (1999-11-01), Sudduth et al.
patent: 5985224 (1999-11-01), Lagana
patent: 6077491 (2000-06-01), Cooper et al.
patent: 6093380 (2000-07-01), Lagana et al.
patent: 6110435 (2000-08-01), Lehner et al.
patent: 6120580 (2000-09-01), Sandler
patent: 6146605 (2000-11-01), Spokoyny
patent: 6322762 (2001-11-01), Cooper et al.
patent: 6436359 (2002-08-01), Spencer, III et al.
patent: 6471927 (2002-10-01), Hofmann et al.
patent: 6511644 (2003-01-01), MacArthur et al.
patent: 6928807 (2005-08-01), Jacob et al.
patent: 2001/0016183 (2001-08-01), Hofmann et al.
patent: 0154 442 (1982-03-01), None
patent: 342 21 75 (1985-12-01), None
patent: 195 10 804 (1996-09-01), None
patent: 195 81 575 (1997-04-01), None
patent: 198 34 980 (1999-12-01), None
patent: 0 326 943 (1989-08-01), None
patent: 0 342 184 (1989-11-01), None
patent: 0 487 886 (1992-06-01), None
patent: 0 582 022 (1994-02-01), None
patent: 0 848 985 (1998-06-01), None
patent: 0 738 179 (1999-04-01), None
patent: 0 019 321 (2000-07-01), None
patent: 896660 (1962-05-01), None
patent: 1103041 (1968-02-01), None
patent: 53-52274 (1978-05-01), None
patent: 57-188560 (1982-11-01), None
patent: 59-82987 (1984-05-01), None
patent: 63-198713 (1988-08-01), None
patent: 63-224785 (1988-09-01), None
patent: 02-191528 (1990-07-01), None
patent: 02-268811 (1990-11-01), None
patent: 06-165913 (1994-06-01), None
patent: 08-057258 (1996-03-01), None
patent: 08-057261 (1996-03-01), None
patent: 08-071372 (1996-03-01), None
patent: 08-215536 (1996-08-01), None
patent: 09-294913 (1997-11-01), None
patent: 11-171535 (1999-06-01), None
patent: 8105027 (1983-06-01), None
patent: 239863 (1969-08-01), None
patent: WO 92/02291 (1992-02-01), None
patent: WO 94/13391 (1994-06-01), None
patent: WO 95/09810 (1995-04-01), None
patent: WO 96/06674 (1996-03-01), None
patent: WO 96/27428 (1996-09-01), None
patent: WO 97/07876 (1997-03-01), None
patent: WO 98/42623 (1998-10-01), None
patent: WO 99/61136 (1999-12-01), None
patent: WO 00/07695 (2000-12-01), None
Kucheryavyi et al.; “Kinetics of the Hydrolysis of Urea at High Temperatures in Relation to Purification of Waste Waters in Urea Manufacture”; translated fromZhurnal Prikladnoi Khimii, vol. 42, No. 7, pp. 1596-1600 (1969).
Blasiak et al.; “Equilibrium Pressure in the System NH4CO2NH2+H2O at High Temperatures”;Chemia Stosowana, vol. 4, No. 545, pp. 545-550 (1983).
Makansi, Jason Ed.; “Ammonia: It's coming to a plant near you”;Powerpp. 20-22 (May, 1992).
Smith et al.; “Integrated Dry NOx/SOxEmissions Control System Low-NOxCombustion System SNCR Test Report,” Public Service Company of Colorado, DOE Contract No. DE-FC22-91 PC 90550 (Jun. 1994).
International Preliminary Examination Report (PCT) Application No. PCT/US98/05708 dated May 11, 1999, believed to be publicly available Oct. 1999.
Hunt et al.; “Selective Non-Catalytic Operating Experience Using Both Urea and Ammonia” 1993 Joint Symposium on Stationary Combustion NOx,Control(May 1993).
Dr.-Ing. Ulrich Neumann; “Drei trockene Typen Das DENOX-Verfahren von Hitachi”;(Three Dry Types—The DeNOxProcess from Hitachi),Energie(Apr., 1986).
International Search Report for PCT/US02/09294 mailed Aug. 7, 2002.
Brooks Burton
Jessup Walter A.
MacArthur Brian W.
Sheats W. Brad
Davis Brian
Marshall & Gerstein & Borun LLP
The Chemithon Corporation
LandOfFree
Process and apparatus for quantitatively converting urea to... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process and apparatus for quantitatively converting urea to..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process and apparatus for quantitatively converting urea to... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3579719