Method for removing contaminants in reactors

Patent 6511644 Issued on January 28, 2003. Estimated Expiration Date:

November 8, 2020. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

3758572

3826815

3922222

Method of hydrolyzing urea contained in waste water streams
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Inventors

Assignee

The Chemithon Corporation

Application

No. 708897 filed on 11/08/2000

US Classes:

423/358, From organic material containing nitrogen423/659MISCELLANEOUS PROCESS

Examiners

Primary: Langel, Wayne A.

Attorney, Agent or Firm

Marshall, Gerstein & Borun

Foreign Patent References

3422175 DE. 12/12/1985
19834980 DE. 12/12/1999
0 487 886 EP. 06/12/1992
0 582 022 EP. 02/12/1994
53-052274 JP. 05/12/1978
59-082987 JP. 05/12/1984
63-198713 JP. 08/12/1988
63-224785 JP. 09/12/1988
02-191528 JP. 07/12/1990
02-268811 JP. 11/12/1990
08-057258 JP. 03/12/1996
08-071372 JP. 03/12/1996
09-294913 JP. 11/12/1997
11-171535 JP. 06/12/1999
239863 SU. 08/12/1969
WO 92/02291 WO. 02/12/1992
WO 95/09810 WO. 04/12/1995
WO 98/42623 WO. 10/12/1998
WO 99/61136 WO. 12/12/1999
WO 00/07695 WO. 02/12/2012

International Class

C01C 001/08

Abstract

The invention provides a method and apparatus for maintaining the operation of reactors by removing contaminant matter arising from the solid reactant(s) used as a feedstock in such systems, by either intermittent or continuous means.

Other References

Walker et al. "Application of A Urea Based Process to Generate Ammonia for the SCR at the Canal Station of Southern Energy, Inc.," ICAC Forum 2000, Institute of Clean Air Companies, Washington, D.C. (believed to have been publicly available Mar. 24, 2000)
Glesmann et al. "Design and Operation of a Safe Alternative to Anhydrous Ammonia: Urea-Based Ammonia-on-Demand (AOD™) at AEP's Gavin Station," Air and Waste Management Association, The U.S. EPA/DOE/EPRI Combined Power Plant Air Pollutant Control Symposium: "The Mega Symposium" and the A&WMA Specialty Conference on Mercury Emissions: Fate, Effects and Control (believed to have been publicly available Aug. 21, 2001)
International Search Report for PCT/US01/41817 dated Mar. 21, 2002, mailed Mar. 28, 2002
Kucheryavyi et al.; Kinetics of the Hydrolysis of Urea at High Temperatures in Relation to Purification of Waste Waters in Urea Manufacture; translated from Zhurnal Prikladnoi Khimii, vol. 42, No. 7, pp. 1596-1600, Jul., 196