Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With regeneration – reclamation – reuse – recycling or...
Reexamination Certificate
2007-11-20
2007-11-20
Hug, Eric (Department: 1731)
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
With regeneration, reclamation, reuse, recycling or...
C162S041000, C162S042000, C162S060000, C162S068000, C162S078000
Reexamination Certificate
active
10872450
ABSTRACT:
A process for high temperature peroxide bleaching of pulp in which pulp is retained at high temperature and pressure to increase bleaching activity but in which the pulp is cooled prior to discharge from the pressure vessel below the flash point thereby resulting in lower energy, nonviolent discharge. Through the use of a heat exchanger, the cooling of the pulp can be performed using recycled filtrate containing residual peroxide, which encourages further bleaching during atmospheric retention. The heat exchanger is also used to heat a water stream, which can be used earlier in the pulping process, resulting in cost savings because energy within the system is retained to a greater degree.
REFERENCES:
patent: 2920011 (1960-01-01), Eilers, Jr.
patent: 3193445 (1965-07-01), Parker et al.
patent: 3251731 (1966-05-01), Gard
patent: 3492199 (1970-01-01), Kindron et al.
patent: 3507744 (1970-04-01), Grangaard
patent: 3650887 (1972-03-01), Grangaard
patent: 3944463 (1976-03-01), Samuelson et al.
patent: 4022654 (1977-05-01), Engstrom et al.
patent: 4160693 (1979-07-01), Lindahl et al.
patent: 4259150 (1981-03-01), Prough
patent: 4294653 (1981-10-01), Lindahl et al.
patent: 4311553 (1982-01-01), Akerlund et al.
patent: 4400237 (1983-08-01), Kruger et al.
patent: 4402788 (1983-09-01), Paulose et al.
patent: 4410397 (1983-10-01), Kempf
patent: 4427490 (1984-01-01), Eckert
patent: 4450044 (1984-05-01), Fritzvold et al.
patent: 4595456 (1986-06-01), Andersson
patent: 4626319 (1986-12-01), Kruger et al.
patent: 4661205 (1987-04-01), Ow et al.
patent: 4689117 (1987-08-01), Villavicencio
patent: 4732650 (1988-03-01), Michalowski et al.
patent: 4734160 (1988-03-01), Moldenius
patent: 4734161 (1988-03-01), Dubreux
patent: 4756798 (1988-07-01), Lachenal et al.
patent: 4756799 (1988-07-01), Bengtsson et al.
patent: 4798651 (1989-01-01), Kokta
patent: 4804440 (1989-02-01), Liebergott et al.
patent: 4826567 (1989-05-01), Gratzl
patent: 4834837 (1989-05-01), Loquenz et al.
patent: 4915785 (1990-04-01), Siminoski et al.
patent: 4975204 (1990-12-01), Henricson et al.
patent: 5118389 (1992-06-01), Dubelsten et al.
patent: 5143581 (1992-09-01), Devic
patent: 5169495 (1992-12-01), Lachenal
patent: 5211809 (1993-05-01), Naddeo et al.
patent: 5223091 (1993-06-01), Hetzler et al.
patent: 5277760 (1994-01-01), Fongen
patent: 5296100 (1994-03-01), Devic
patent: 5298118 (1994-03-01), Devic
patent: 5306392 (1994-04-01), Mita
patent: 5310458 (1994-05-01), Lundgren et al.
patent: 5401360 (1995-03-01), Galland
patent: 5401362 (1995-03-01), Lindberg
patent: 5540816 (1996-07-01), Andtbacka et al.
patent: 5571377 (1996-11-01), Tibbling et al.
patent: 5620563 (1997-04-01), Chen
patent: 5658429 (1997-08-01), Andersson et al.
patent: 5698075 (1997-12-01), Troughton et al.
patent: 5733412 (1998-03-01), Markham et al.
patent: 5755925 (1998-05-01), Kogan et al.
patent: 5755926 (1998-05-01), Hankins et al.
patent: 5766414 (1998-06-01), Alenius et al.
patent: 5766415 (1998-06-01), Chen
patent: 5785812 (1998-07-01), Linsten et al.
patent: 5855622 (1999-01-01), Takeuchi
patent: 5858170 (1999-01-01), Carlsson et al.
patent: 5885412 (1999-03-01), Paart et al.
patent: 5900111 (1999-05-01), Nystrom et al.
patent: 5916415 (1999-06-01), Miller
patent: 5958179 (1999-09-01), Gehr et al.
patent: 5980689 (1999-11-01), Germgard
patent: 5997689 (1999-12-01), Bokstrom
patent: 6106667 (2000-08-01), Henricson
patent: 6136145 (2000-10-01), Henricson et al.
patent: 6153300 (2000-11-01), Stromberg et al.
patent: 6221207 (2001-04-01), Forslund et al.
patent: 6491787 (2002-12-01), Peltonen et al.
patent: 6743332 (2004-06-01), Haynes et al.
patent: 6746568 (2004-06-01), Terelius et al.
patent: 6824646 (2004-11-01), Izumi et al.
patent: 0 919 661 (1999-06-01), None
G.A. Smook, Handbook for Pulp & Paper Technologists, 1982, TAPPI, p. 198.
Patrick Fitzgerald, “ECF Riding High: ECF Appears to Have Won its Battle Against TCF and is Poised to Become the Dominant Bleaching Technology in North America”, Nov. 6, 1995, Chemical Marketing Reporter; found at http://web.archive.org/web/20030828023558/http://aet.org/reports/articles/1995/NEWS31.html, updated Aug. 28, 2003.
Lee Jeffrey A.
Thomas Hazen Charles
Winkler Wayne F.
Finnegan Henderson Farabow Garrett & Dunner LLP
Georgia-Pacific Consumer Products LP
Hug Eric
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