Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With regeneration – reclamation – reuse – recycling or...
Patent
1993-09-07
1996-06-11
Alvo, Steven
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
With regeneration, reclamation, reuse, recycling or...
162 56, 162 65, 162 90, D21C 912, D21C 9147
Patent
active
055251951
ABSTRACT:
Unbleached pulp is washed with an aqueous alkaline solution in a wash press to substantially uniformly distribute a first amount of alkaline material throughout the pulp. The consistency of the pulp exiting the wash press is above about 18%, preferably between 25 to 35 percent by weight, and the high consistency alkali containing pulp is then treated with oxygen to effect delignification. The use of a wash press reduces the overall amounts of alkaline material utilized in the process compared to processes which add alkaline material to the pulp at low consistency. Additional alkali may be applied, if desired, onto the high consistency pulp prior to oxygen delignification to provide a total amount of between 0.8 and 7 percent by weight of oven dry pulp. High strength, low lignin pulps are formed after oxygen delignification which may be further bleached to high brightness with reduced amounts of bleaching chemicals.
REFERENCES:
patent: 1860432 (1932-05-01), Richter
patent: 2926114 (1960-02-01), Grangaard et al.
patent: 3024158 (1962-03-01), Grangaard et al.
patent: 3251730 (1966-05-01), Watanabe
patent: 3274049 (1966-09-01), Gaschke et al.
patent: 3384533 (1968-05-01), Meylan et al.
patent: 3423282 (1969-01-01), Rerolle et al.
patent: 3652388 (1972-03-01), Croon et al.
patent: 3660225 (1972-06-01), Verreyne et al.
patent: 3661699 (1972-05-01), Farley
patent: 3740310 (1973-06-01), Smith et al.
patent: 3759783 (1973-09-01), Samuelson et al.
patent: 3832276 (1974-08-01), Roymoulik et al.
patent: 3874992 (1975-04-01), Liebergott
patent: 3888727 (1975-06-01), Kenig
patent: 3951733 (1976-05-01), Phillips
patent: 4080249 (1978-03-01), Kempf et al.
patent: 4089737 (1978-05-01), Nagano et al.
patent: 4120747 (1978-10-01), Sarge, III et al.
patent: 4155806 (1979-05-01), Mannbro
patent: 4198266 (1980-04-01), Kirk et al.
patent: 4220498 (1980-09-01), Prough
patent: 4248662 (1981-02-01), Wallick
patent: 4259150 (1981-03-01), Prough
patent: 4274913 (1981-06-01), Kikuiri et al.
patent: 4295925 (1981-10-01), Bentvelzen et al.
patent: 4295926 (1981-10-01), Bentvelzen et al.
patent: 4298426 (1981-11-01), Torregrossa et al.
patent: 4298427 (1981-11-01), Bentvelzen et al.
patent: 4363697 (1982-12-01), Markham et al.
patent: 4372812 (1983-02-01), Phillips
patent: 4384920 (1983-05-01), Markham et al.
patent: 4431480 (1984-02-01), Markham et al.
patent: 4435249 (1984-02-01), Markham et al.
patent: 4439271 (1984-03-01), Samuelson
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: 4568420 (1986-02-01), Nonni
patent: 4595455 (1986-06-01), Mannbro
patent: 4619733 (1986-10-01), Kooi
patent: 4806203 (1989-04-01), Elton
patent: 4834837 (1989-05-01), Loquenz
patent: 4840703 (1989-06-01), Malmsten
patent: 5085734 (1992-02-01), Griggs
patent: 5173153 (1992-12-01), Terrett et al.
Abrahamsson et al., "Oxygen/Sodium Carbonate Bleaching of Kraft Pulp Pretreated with Nitrogen Dioxide and Oxygen", Svensk Papperstidning (1983).
Allison, "Production of Bleached Softwood Pulp by Low Pollution Processes", Wood Sci. Technol. 17, pp. 129-137 (1983).
Andtbaka, "Low Kappa Pulping Followed by Oxygen Delignification", Appita, vol. 39, No. 2, (1986), pp. 154-172.
Brannland et al., "How to Cope With TOCL", International Oxygen Delignification Conference, (1987).
Carlberg et al., "Bleaching of Sulphite and Sulphate Pulps Using Conventional and Unconventional Sequences", TAPPI Proceedings 1982 Annual Meeting, p. 381.
Casey, J. P., "Bleaching: A Perspective", TAPPI Journal, vol. 66, No. 7 (Jul. 1983) p. 95.
Christensen, P. K., "Bleaching of Sulphate Pulps With Hydrogen Peroxide".
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).
Elton et al., "New Technology for Medium-Consistency Oxygen Bleaching".
Fossum et al., "Final Bleaching of Kraft Pulps Delignified to Low Kappa Number by Oxygen Bleaching", Tappi Journal pp. 60-62 (Dec. 1983).
Fujii, et al., "Oxygen Pulping of Hardwoods," TAPPI, Alkaline Pulping/Secondary Fibers Conference (Washington, D.C., Nov. 7-10, 1977).
Gellerstedt et al., "Singlet Oxygen Oxidation of Lignin Structures," Singlet Oxygen, Chapter 31, pp. 302-310, (Sept. 1976).
Germgard et al., "Mathematical Models for Simulation and Control of Bleaching Stages", Nordic Pulp and Paper Research Journal, No. 1 (1987).
Gierer, "Chemistry of Delignification, Part 2: Reactions of Lignins During Bleaching", Word Science and Technology (1986).
Gierer, "Mechanisms of Bleach with Oxygen-Containing Species", ISWPC, (1987).
Gupta, et al., "OZ Prebleaching, Influence of Viscosity and Sheet Strength", TAPPI Symposium--Oxygen Delignification, p. 1 (1984).
Heimburger et al., "Kraft Mill Bleach Plant Effluents: Recent Developments Aimed at Decreasing Their Environmental Impact".
Heimburger et al., "Kraft Mill Bleach Plant Effluents: Recent Developments Aimed at Decreasing Their Environmental Impact Part II", TAPPI Journal, p. 69 (Nov. 1988).
Jamieson et al., "Integration of Oxygen Bleaching in the Brown Stock Washing Sytem", Svensk Paperstidning (1973).
Kirk et al., "Low Consistency Oxygen Delignification in a Pipeline Reactor", TAPPI, vol. 61, No. 5.
Leopold, B., "The Pulping Mill of the Future", Textile and Paper Chemistry and Technology, p.239.
Leopold, B., "The Pulping Process--Opportunity or Headache?" Proceedings of IPC Conference, Paper Science and Technology, May 8-10, 1979.
Liebergott, et al., "The Use of Ozone in Bleaching and Brightening Wood Pulps: Part I-Chemical Pulps" (TAPPI 1978).
Liebergott et al., "The Use of Ozone or Oxygen in the First Bleaching State", Ozone: Science and Engineering, vol. 4, p. 109 (1982).
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.
Liebergott, et al., "Comparison Between Oxygen and Ozone Delignification in the Bleaching of Kraft Pulps", TAPPI Proceedings-1981 Pulping Conference, p. 157.
McDonough, "Oxygen Bleaching's Pace Quickens", IPC Technical Paper Series, No. 246 (Jul. 1987).
Perkins et al, "Brown Stock Washing Efficiency", TAPPI, vol. 37, No. 3, Mar. 1954, pp. 83-89.
Rydholm, "Pulping Processes", Interscience Publishers, New York, 1967, pp. 880-883.
Ohnishi, K., "Japan: Pulping, Bleaching", Pulp and Paper (Aug. 1978) p. 88.
Ow, et al., "Advances In Ozone Bleaching: Part II--Bleaching of Softwood Kraft Pulps With Oxygen and Ozone Combination", TAPPI Symposium-Oxygen Delignification (1984).
Partridge, H., "New Pulp Bleaching Developments", CEP (Jun. 1976).
Partridge, H., "An Overview of New Pulp Bleaching Developments" AIChE National Meeting, Paper No. 24a. (Sep. 7-10, 1975).
Perkins et al., "Advances in Ozone Bleaching--Part III--Pilot Plant Installations and Proposed Commercial Implementation".
Seifert et al., "Engineering Considerations in the Design of Oxygen Reactors", p. 309.
Singh, "The Bleaching of Pulp", TAPPI, 3rd ed., Chapter 7 (1979).
Smook, "Bleaching, Handbook For Pulp & Paper Technologies" - Chapter 11 (TAPPI).
Soteland, N., "Bleaching of Chemical Pulps With Oxygen and Ozone", Pulp and Paper Magazine of Canada, vol. 75, No. 4 (Apr., 1974) p. 91.
Soteland, N., "Bleaching of Chemical Pulps With Oxygen and Ozone", Norsk Skogindustri (Sep. 1978) p. 199.
Soteland, "Comparison Between Oxygen and Ozone Delignification of Sulphite Pulps", TAPPI Symposium--Oxygen Delignification p. 71 (1984).
Wong et al., "Toxicity, BOD and Color of Effluents From Novel Bleaching Processes", Pulp and Paper Magazine of Canada, vol. 79, No. 7 (Jul. 1978) p. 41.
Eachus Spencer W.
Friend William H.
Griggs Bruce F.
Terrett Stuart T.
Alvo Steven
Chong Suet M.
Nath Gary M.
Union Camp Patent Holding, Inc.
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