Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With regeneration – reclamation – reuse – recycling or...
Patent
1991-08-01
2000-10-03
Alvo, Steve
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
With regeneration, reclamation, reuse, recycling or...
162 301, 162 56, 162 65, D21C 1106, D21C 9153
Patent
active
061267813
ABSTRACT:
A process for conditioning an ozone gas recycle stream in an ozone pulp bleaching process, wherein the level of carbon dioxide in the recycle stream is controlled to allow full capacity operation of the ozone generator. Carbon dioxide concentration is identified over the relevant operational ranges and maximum concentration is identified for full capacity/optimum efficiency operation. Specific methods are described for controlling carbon dioxide concentration including purging a portion of the recycle stream, counter-current scrubbing of the recycle stream with an alkaline solution and passing the recycle stream through an adsorbent material. Contaminants entering the system also may be reduced by directing the purged recycle stream, which is relatively oxygen rich, into the dewatering press where pulp consistency is increased. In this manner nitrogen surrounding the pulp is displaced by oxygen and thus, does not enter the bleaching/ozone system with the pulp.
REFERENCES:
patent: 2466633 (1949-04-01), Brabender et al.
patent: 2700648 (1955-01-01), Thorp et al.
patent: 3151943 (1964-10-01), Fujimoto et al.
patent: 3421999 (1969-01-01), Corwin
patent: 3525665 (1970-08-01), Gessner
patent: 3668063 (1972-06-01), Engstrom
patent: 3715430 (1973-02-01), Ryan
patent: 3748262 (1973-07-01), Lee et al.
patent: 3764464 (1973-10-01), Samuelson
patent: 3963625 (1976-06-01), Lowther
patent: 4132637 (1979-01-01), Key et al.
patent: 4196043 (1980-04-01), Singh
patent: 4279694 (1981-07-01), Fritzvold et al.
patent: 4287130 (1981-09-01), Dohm et al.
patent: 4399292 (1983-08-01), Rossi et al.
patent: 4430306 (1984-02-01), Namba et al.
patent: 5039314 (1991-08-01), Lehner et al.
patent: 5164043 (1992-11-01), Griggs et al.
Perkins, "Equipment for Rapid Press-Caustic Extraction" Tappi Alkaline Pulp Conference; Oct. 1975 Williamsburg, VA pp. 162-189.
Kurtz, "Deaeration: Some Practical Applications and Benefits for Pulp and Paper Mills" Tappi Eng. Conf., Sep. 19-21, 1978 San Francisco, CA pp. 399-357.
Cromwell and Manley, "Effect of Gaseous Diluents on Energy Yield of Ozone Generation from Oxygen" Ozone Chemistry and Technology, Advances in Chemistry Series No. 21, pp. 309-310 (American Chemical Society, Mar. 1959).
Jaisli and Klein, "System for the Economical Production of Ozone for Large-Scale Application in the Cellulose Bleaching Process", dpw--Deutsche Papierwirtschaft (1987/3) pp. T54-T66.
Nebel, Ozone, Encyclopedia of Chemical Technology, vol. 16, pp. 691-696.
Perkins and Schleinkofer, Advances in Ozone Bleaching--Part III.
Rothenberg, et al., "Bleaching of Oxygen Pulp with Ozone", Tappi Journal, Aug. 1975, pp. 182-185.
Soteland, "Bleaching of Chemical Pulps with Oxygen and Ozone", Pulp and Paper Magazine of Canada, T153-58 (1974).
Tritschler and Shelton, "Commercial Manufacture and Industrial Use of Ozone as an Oxidant".
Friend William H.
Joseph James
Pikulin Michael A.
Alvo Steve
Union Camp Patent Holding, Inc.
LandOfFree
Process for conditioning ozone gas recycle stream in ozone pulp 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 for conditioning ozone gas recycle stream in ozone pulp , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for conditioning ozone gas recycle stream in ozone pulp will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-191140