Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With agitation or forced circulation
Patent
1993-07-27
1995-08-15
Alvo, Steve
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
With agitation or forced circulation
162 56, 162 65, D21C 9153
Patent
active
054416035
ABSTRACT:
A process for delignifying and bleaching a lignocellulosic pulp without the use of elemental chlorine by partially delignifying the pulp to a K No. of about 10 or less and a viscosity of greater than about 13 cps; and further delignifying the partially delignified pulp with an effective amount of ozone for a sufficient time to obtain a substantially delignified pulp having a K No. of about 5 or less, a viscosity of greater than about 10, and a GE brightness of at least about 50%. The substantially delignified pulp may be brightened by the addition of a bleaching agent such as chlorine dioxide or a peroxide to obtain a final product having a GE brightness of at least about 65%, preferably above 70% to as high as 90%. Because of the absence of elemental chlorine in this sequence, filtrate from all stages but the chlorine dioxide stage (if used) can be recovered without sewering. Major environmental improvements are thus achieved.
REFERENCES:
patent: 1591070 (1926-07-01), Wolf
patent: 3318657 (1967-05-01), Wade
patent: 3451888 (1969-06-01), Ancelle et al.
patent: 3652388 (1972-03-01), Croon et al.
patent: 3660225 (1972-05-01), Verreyne et al.
patent: 3663357 (1972-05-01), Liebergott
patent: 3703435 (1972-11-01), Schleinofer
patent: 3725193 (1973-04-01), De Montigny
patent: 3759783 (1973-09-01), Samuelson et al.
patent: 3785577 (1974-01-01), Carlsmith
patent: 3814664 (1974-06-01), Carlsmith
patent: 3832273 (1974-08-01), Roymoulik et al.
patent: 3874992 (1975-04-01), Liebergott
patent: 3888727 (1975-06-01), Kenig
patent: 3926798 (1975-12-01), Cadotte
patent: 3964962 (1976-06-01), Carlsmith
patent: 4046621 (1977-09-01), Sexton
patent: 4080249 (1978-03-01), Kempf et al.
patent: 4089737 (1978-05-01), Nagano et al.
patent: 4119486 (1978-10-01), Eckert
patent: 4123317 (1978-10-01), Fritzvold et al.
patent: 4155806 (1979-05-01), Mannbro
patent: 4155845 (1979-05-01), Ancelle et al.
patent: 4198266 (1980-04-01), Kirk et al.
patent: 4216054 (1980-08-01), Bentvelzen
patent: 4220498 (1980-09-01), Prough
patent: 4226673 (1980-10-01), Fremont
patent: 4229252 (1980-10-01), Meredith
patent: 4268350 (1981-05-01), Mansson
patent: 4274913 (1981-06-01), Kikuiti et al.
patent: 4278496 (1981-07-01), Fritzvold
patent: 4283251 (1981-08-01), Singh
patent: 4295925 (1981-10-01), Bentvelzen et al.
patent: 4295926 (1981-10-01), Bentvelzen et al.
patent: 4298427 (1981-11-01), Bentvelzen et al.
patent: 4363697 (1982-12-01), Markham et al.
patent: 4372812 (1983-02-01), Phillips et al.
patent: 4384920 (1983-05-01), Markham et al.
patent: 4431480 (1984-02-01), Markham et al.
patent: 4435249 (1984-03-01), Markham et al.
patent: 4439271 (1984-03-01), Samuelson
patent: 4444621 (1984-04-01), Lindhal
patent: 4450044 (1984-05-01), Fritzvold et al.
patent: 4451332 (1984-05-01), Annergren et al.
patent: 4459174 (1984-07-01), Papageorges et al.
patent: 4468286 (1984-08-01), Johnsen
patent: 4563243 (1986-01-01), Koch et al.
patent: 4568420 (1986-02-01), Nommi
patent: 4595455 (1986-06-01), Mannbro
patent: 4640782 (1987-02-01), Burleson
patent: 4806203 (1989-02-01), Elton
patent: 4840703 (1989-06-01), Malmsten
patent: 5085734 (1992-02-01), Griggs
patent: 5164043 (1992-11-01), Griggs et al.
patent: 5174861 (1992-12-01), White et al.
Soteland, "Bleaching of Chem. Pulps with Oxygen & Ozone" Pulp & Paper of Canada, pp. 91-96 Apr. 1974.
Schleinkofer, "Overview of A Chlorine-Free Bleaching Process", 1981 Oxidative Bleaching Conf.; Denver Oct. 22, 1981.
Soteland, Bleaching of Chemical Pulps with Oxygen and Ozone, Pulp and Paper Magazine of Canada, vol. 75, No. 4, Apr. 1974 pp. 91-95.
Dow Chemical Co., "Keys to Chelation" (1985).
Allison, Effects of Temperature and Chemical Pretretment on Pulp Bleaching with Ozone, 1985 Int'l Pulping Conference pp. 47-53.
Smith, The Sequestration of Metals, Macmillan, New York 1959 pp. 54-69.
McDonough, "Oxygen Bleaching's Pace Quickens", IPC Technical Paper Series, No. 246 (Jul. 1987).
Geiger, "Mechanisms of Bleach with Oxygen-Containing Species", ISWPC, (1987).
Lindholm, "Effect of Heterogeneity in Pulp Bleaching with Ozone", Paperi ja Puu, (Apr. 1987).
Lindholm, "Effect of Pulp Consistency and pH in Ozone Bleaching", Paperi ja Puu, (Mar. 1987).
Lindholm "Effect of Pulp Consistency and pH in Ozone Bleaching: Part 2", International Oxygen Delignification Conference (1987).
Hill and Rice, "Handbook of Ozone Technology and Applications", Ann Arbor Science.
Eriksson and Gierer, "Ozonation of Residual Lignin".
Article, "Naco Straw Pulp", PPI, (Apr. 1987).
Norden and Simonson, "Ozone Bleaching of Sulphite Pulp--A Pilot Plant Study".
Germgard and Sjogren, "Ozone Prebleaching of a Modified-Cooked and Oxygen-Bleached Softwood Kraft Pulp", Svensk Papperstidning, No. 15, (1985).
Schuerch, "Ozonization of Cellulose and Wood, Journal of Polymer Science", No. 2, (1963).
Vidal and Holinier, "Ozonolysis of Lignin--Improvement of In Vitro Digestibility of Poplar Sawdust", Biomass 16, (1988).
Godsay and Pearce, "Physico-Chemical Properties of Ozone Oxidized Kraft Pulps", Oxygen Delignification (1984).
Gangolli, "The Use of Ozone and Pulp in the Paper Industry".
Gregor and Gregor, "Synthetic-Membrane Technology", Scientific American, (Jul. 1970).
Britt, "Pulp and Paper Technology".
Germgard, "Chlorate Discharge from Bleach Plants--How to Handle a Potential Environmental Problem", Paperi ja Puu, V. 71, No. 3, (1989).
Singh "The Bleaching of Pulp", Tappi Press, 3rd Edition.
Reeve and Earl, "Chlorinated Organic Matter in Bleached Chemical Pulp Production Part 1: Environment Impact and Regulations of Effluents, Pulp and Paper Canada", 90:4, (1989).
Brannland and Fossin, "How to Cope With TOCL", International Oxygen Delignification Conference, (1987).
Andtbacka, "Low Kappa Pulping Followed by Oxygen Delignification", Appita, vol. 39, No. 2, (1986).
Talka and Priha, "Fractionation and Identification of Some Biologically Active Compounds in Bleached Kraft Mill Effluents", Paperi ja Puu (1987).
Jamieson and Smedman, "Integration of Oxygen Bleaching in the Brown Stock Washing System", Svensk Papperstidning (1973).
Germgard et al., "Mathematical Models for Simulation and Control of Bleaching Stages", Nordic Pulp and Paper Research Journal, No. 1 (1987).
Katai and Schuerch, "Mechanism of Ozone Attack on Alpha-Methyl Glucoside and Cellulosic Materials".
Balousck, "The Effects of Ozone Upon Lignin Model Containing the P-aryl Ether Linkage", Svensk Papperstidning, No. 9, 1981.
DeSousa et al., "The Influence of Chlorine Ratio and Oxygen Bleaching on the Formation of PCDF's and PCCD's in Pulp Bleaching", Tappi Journal (Apr. 1989).
Tritschler and Shelton, "Commercial Manufacture and Industrial Use of Ozone and an Oxidant".
Voss et al., "Some New Insights Into the Origins of Dioxins Formed During Chemical Pulp Bleaching", Pulp and Paper Canada, 89:12 (1988).
Abrahanson and Samuelson, "Oxygen/Sodium Carbonate Bleaching of Kraft Pulp Pretreated with Nitrogen Dioxide and Oxygen", Svensk Papperstidning (1983).
Eickeler, "Ozone Measurement with Detector Tubes".
Ouederni, "Simulation of the Ozone/Lignin Reaction in an Agitated vessel".
Gierer, "Chemistry of Delignification, Part 2: Reactions of Lignins During Bleaching", Word Science and Technology (1986).
Fossum et al., "Final Bleaching of Kraft Pulps Delignified to Low Kappa Number by Oxygen Bleaching", Tappi Journal pp. 60-62 (Dec. 1983).
Liebergott, et al., Bleaching a Softwood Kraft Pulp Without Chlorine Compounds, TAPPI Journal, p. 76 (Aug. 1984).
Liebergott, et al., Bleaching a Softwood Kraft Pulp Without Chlorine Compounds, pp. 1-10.
Allison, Production of Bleached Softwood Pulp by Low Pollution Processes, Wood Sci. Technol. 17, pp. 129-137 (1983).
Patt, et al., Use of Ozone For Pulp Bleaching, Papier, 42 (10A), V 14-23 (1988).
Soteland, Comparison Between Oxygen and Ozone Delignification of Sulphite Pulps, TAPPI Symposium--Oxygen Delignification p. 71 (1984).
Gupta, et al., OZ Prebleaching, Influence on Viscosity and Sheet Strength, TAPPI Symposium--Oxygen Delignification, p. 1 (1984).
Heimburger et al., Kraft Mill Bleach Plant Effluents: Recent Developments Aimed at Decreasing Th
Gandek Thomas P.
Griggs Bruce F.
Pikulin Michael A.
Rosen Allen
Alvo Steve
Union Camp Patent Holding, Inc.
LandOfFree
Method for chelation of pulp prior to ozone delignification does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method for chelation of pulp prior to ozone delignification, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for chelation of pulp prior to ozone delignification will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2179196