Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With cleaning – preserving or conditioning of apparatus
Patent
1996-09-04
1997-12-02
Czaja, Donald E.
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
With cleaning, preserving or conditioning of apparatus
162 65, 162DIG8, D21C 9153
Patent
active
056931840
ABSTRACT:
A method for reducing or eliminating the formation of salt scale upon process equipment caused by precipitation of insoluble salts during the bleaching of pulp. The pulp is subjected to a bleaching sequence which includes a plurality of pulp treatment steps, wherein at least one pulp treatment step is conducted under alkaline conditions and at least one pulp treatment step is conducted under acidic conditions. A filtrate stream which contains dissolved insoluble salts therein is thus generated, and at least a portion of the filtrate stream is combined with an alkaline stream and pulp to cause the salts to associate with the pulp, thus removing the salts from the filtrate stream to reduce or eliminate the formation of salt scale upon process equipment during the bleaching of the pulp.
REFERENCES:
patent: 1818913 (1931-08-01), Van De Carr, Jr.
patent: 1860432 (1932-05-01), Richter
patent: 1957937 (1934-05-01), Campbell et al.
patent: 2013115 (1935-09-01), Thorne
patent: 2057059 (1936-11-01), Rue
patent: 2431478 (1947-11-01), Hill
patent: 2466633 (1949-04-01), Brabender et al.
patent: 2926114 (1960-02-01), Grangaard et al.
patent: 2975169 (1961-03-01), Cranford 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: 3318657 (1967-05-01), Wade
patent: 3384533 (1968-05-01), Meylan et al.
patent: 3423282 (1969-01-01), Rerolle et al.
patent: 3451888 (1969-06-01), Ancelle et al.
patent: 3462344 (1969-08-01), Kindron et al.
patent: 3630828 (1971-12-01), Liebergott 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: 3703425 (1972-11-01), Schleinofer
patent: 3725193 (1973-04-01), De Montigny
patent: 3740310 (1973-06-01), Smith et al.
patent: 3759783 (1973-09-01), Samuelson et al.
patent: 3785577 (1974-01-01), Carlsmith
patent: 3814664 (1974-06-01), Carlsmith
patent: 3832276 (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: 3951733 (1976-04-01), Phillips
patent: 3962029 (1976-06-01), Wettermark et al.
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: 4093506 (1978-06-01), Richter
patent: 4119486 (1978-10-01), Eckert
patent: 4120747 (1978-10-01), Sarge, III et al.
patent: 4123317 (1978-10-01), Fritzvold et al.
patent: 4155806 (1979-05-01), Mannbro
patent: 4155845 (1979-05-01), Ancelle et al.
patent: 4158597 (1979-06-01), Petersson
patent: 4198266 (1980-04-01), Kirk et al.
patent: 4216054 (1980-08-01), Bentvelzen et al.
patent: 4220498 (1980-09-01), Prough
patent: 4226673 (1980-10-01), Fremont
patent: 4229252 (1980-10-01), Meredith
patent: 4248662 (1981-02-01), Wallick
patent: 4259150 (1981-03-01), Prough
patent: 4268350 (1981-05-01), Mansson
patent: 4272918 (1981-06-01), Zilka
patent: 4274913 (1981-06-01), Kikuiri et al.
patent: 4278496 (1981-07-01), Fritzvold
patent: 4279694 (1981-07-01), Fritzvold et al.
patent: 4283251 (1981-08-01), Singh
patent: 4295925 (1981-10-01), Bentvelzen et al.
patent: 4295926 (1981-10-01), Bentvelzen et al.
patent: 4298426 (1981-11-01), Torregrossa
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: 4426256 (1984-01-01), Johnsen
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), Nonni
patent: 4595455 (1986-06-01), Mannbro
patent: 4640782 (1987-02-01), Burleson
patent: 4818339 (1989-04-01), Lamort
patent: 4834837 (1989-05-01), Loqenz
patent: 4840703 (1989-06-01), Malmsten
patent: 5039314 (1991-08-01), Lehner et al.
patent: 5096539 (1992-03-01), Allan
patent: 5164043 (1992-11-01), Griggs et al.
patent: 5164044 (1992-11-01), Griggs et al.
patent: 5188708 (1993-02-01), Griggs et al.
patent: 5211811 (1993-05-01), Griggs et al.
patent: 5217574 (1993-06-01), Griggs
patent: 5290454 (1994-03-01), Dorica et al.
patent: 5352332 (1994-10-01), Maples et al.
patent: 5401362 (1995-03-01), Lindberg
patent: 5462641 (1995-10-01), Bergvist et al.
Allison, R.W., "Effect of Ozone on High-Temperature Thermomechanical Pulp", Appita, vol. 32, No. 4 (Jan. 1979) p. 279.
Allison, Production of Bleached Softwood Pulp by Low Pollution Processes, Wood Sci. Technol. 17, pp. 129-137 (1983).
Andtbacka, "Low Kappa Pulping Followed by Oxygen Delignification", Appita, vol. 39, No. 2, (1986).
Backlund, A., "A Progress Report on Continuous Digester Development", Paper Presented to the 21st EUCEPA International Conference--Torremolinos, Spain.
Balousck, "The Effects of Ozone Upon Lignin Model Containing the B-aryl Ether Linkage", Svensk Papperstidning, No. 9, 1981.
Byrd, Jr., Medwick V., "Delignification and bleaching of chemical pulps with ozone: a literature review", TAPPI Journal, Mar. 1992.
Brannland and Fossin, "How to Cope With TOCL", International Oxygen Delignification Conference, (1987).
Britt, "Pulp and Paper Technology".
Casey, J.P., "Bleaching: A Perspective", TAPPI Journal, vol. 66, No. 7 (Jul. 1983) p. 95.
Carlberg et al., "Bleaching of Sulphite and Sulphate Pulps Using Conventional and Unconventional Sequences", TAPPI Proceedings 1982 Annual Meeting, p. 381.
Chapter 6--Sulfite Pulping, Handbook for Pulp & Paper Technologists (TAPPI).
Chapter 7--Kraft Pulping, Handbook for Pulp & Paper Technologists (TAPPI).
Chapter 11--Bleaching, Handbook for Pulp & Paper Technologists (TAPPI).
Christenson, P.K., Bleaching of Sulphate Pulps with Hydrogen Peroxide: III. Bleaching of Oxygen Bleached Pulps, Norsk Skogindustri (Oct. 1973) p. 268.
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).
Dyck, A.W.J., "New Advances in Mechanical Pulping", American Paper Industry (Sep. 1971) p. 21.
Eickeler, "Ozone Measurement with Detector Tubes".
Elton et al., "New Technology for Medium-Consistency Oxygen Bleaching".
Eriksson and Gierer, "Ozonation of Residual Lignin".
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).
Gangolli, "The Use of Ozone and Pulp in the Paper Industry".
Geiger, "Mechanisms of Bleach with Oxygen-Containing Species", ISWPC, (1987).
Gellerstedt et al., "Singlet Oxygen Oxidation of Lignin Structures," Singlet Oxygen, Chapter 31, pp,. 302-310, (Sep. 1976).
Germgard, "Chlorate Discharge from Bleach Plants--How to Handle a Potential Environmental Problem", Paperi ja Puu, vol. 71, No. 3, (1989).
Germgard et al., "Mathematical Models for Simulation and Control of Bleaching Stages," Nordic Pulp and Paper Research Journal, No. 1 (1987).
Germgard and Sjogren, "Ozone Prebleaching of a Modified-Cooked and Oxygen-Bleached Softwood Kraft Pulp", Svensk Papperstidning, No. 15, (1985).
Gierer, "Chemistry of Delignification, Part 2: Reactions Of Lignins During Bleaching", World Science and Technology (1986).
Godsay and Pearce, "Physico-Chemical Properties of Ozone Oxidized Kraft Pulps", Oxygen Delignification (1984).
Grant, R.S., Displacement Heating Trials with a New Process to Reduce Steam, TAPPI Journal (Mar. 1983) p. 120.
Gregor and Gregor, "Synthetic--Membrane Technology", Scientific American, (Jul. 1978).
Gupta, et al., OZ Prebleaching, Influence on Viscosity and Sheet Strength, TAPPI Symposium-Oxygen Delignificatioin, p. 1 (1984).
Heimburger et al., Kraft Mill Bleach Plant Effluents:
Bowden Philip E.
Gandek Thomas P.
Joseph James C.
Pangalos George
Pikulin Michael A.
Czaja Donald E.
Nguyen Dean T.
Union Camp Patent Holding, Inc.
LandOfFree
Reduction of salt scale precipitation by control of process stre does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Reduction of salt scale precipitation by control of process stre, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Reduction of salt scale precipitation by control of process stre will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-798186