EP0112377B1 - Ozonbleiche aus cellulosematerialien - Google Patents

Ozonbleiche aus cellulosematerialien Download PDF

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Publication number
EP0112377B1
EP0112377B1 EP83902324A EP83902324A EP0112377B1 EP 0112377 B1 EP0112377 B1 EP 0112377B1 EP 83902324 A EP83902324 A EP 83902324A EP 83902324 A EP83902324 A EP 83902324A EP 0112377 B1 EP0112377 B1 EP 0112377B1
Authority
EP
European Patent Office
Prior art keywords
pulp
ozone
bleaching
consistency
ultraviolet light
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP83902324A
Other languages
English (en)
French (fr)
Other versions
EP0112377A1 (de
Inventor
Rudra P. Singh
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kimberly Clark Tissue Co
Original Assignee
Scott Paper Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Scott Paper Co filed Critical Scott Paper Co
Publication of EP0112377A1 publication Critical patent/EP0112377A1/de
Application granted granted Critical
Publication of EP0112377B1 publication Critical patent/EP0112377B1/de
Expired legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/10—Bleaching ; Apparatus therefor
    • D21C9/1073—Bleaching ; Apparatus therefor with O3
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/10—Bleaching ; Apparatus therefor
    • D21C9/1015—Bleaching ; Apparatus therefor with use of means other than pressure, temperature

Definitions

  • Pulping is the changing of wood chips or other lignocellulosic material to fibrous form. Chemical pulping requires cooking of such material in solution with a chemical, and' includes partial removal of the coloring matter such as lignin associated with the wood.
  • Bleaching is the treatment of cellulosic fibers to remove or alter the coloring matter associated with the fibers to allow the fiber to reflect white light more truly.
  • the present invention is concerned with the degradation of lignin and hence "delignification” and “bleaching” are used interchangeably.
  • Consistency is the weight of pulp fibers in a pulp suspension usually expressed as a percentage. For example, one part by weight oven dry fiber in one hundred parts by weight of a mixture of water and fibers would be a pulp suspension of 1 % consistency. The consistency of . the pulp will depend upon the type of dewatering equipment used.
  • Low consistency is typically from 4-6%. It is a suspension that is pumpable in an ordinary centrifugal pump and is obtainable using deckers and filters without press rolls.
  • Medium consistency is between 10 and 15%. This consistency can be obtained by vacuum washers and vacuum thickeners. Above 15%, press rolls are needed for dewatering. A medium consistency slurry is pumpable by special machinery.
  • High consistency is from 20-35%. This consistency is obtained by the use of presses. High consistency pulp is essentially nonpumpable.
  • One measure of the efficacy of a bleaching process is the degree of delignification. There are many methods of measuring the degree of delignification of the pulp, but most are variations of the permanganate test.
  • the permanganate test used herein provides a Kappa number-a measure of potassium permanganate solution consumed by oven dry pulp under specified conditions.
  • the Kappa number is determined in accordance with TAPPI standard test method T 214 M42.
  • Patent 3,637,342 to Veloz can be employed, following the teachings of Kempf et al for entraining the ozone bearing gas into the slurry of pulp.
  • high consistency pulp reactors such as disclosed by Fritzvold in U.S. Patents 4,278,496 and 4,123,317 and by Carlsmith in U.S. Patents 3,814,664 and 3,964,962 it is contemplated that lamps emitting ultraviolet light be mounted on the walls of the reaction chamber.
  • ultraviolet radiation increases the effectiveness of the ozonation.
  • the present inventor believes that the ultraviolet radiation electronically excites the lignin in the material to be bleached.
  • the excited lignin may then form a high energy complex with the ozone (or possibly singlet oxygen). It is speculated that this complex immediately breaks apart into degradation products of lignin.
  • Lignin because of its aromatic nature, absorbs strongly in the ultraviolet region of the spectrum.
  • the typical lignin absorption spectrum comprises a maximum at 205 nm (nanometers), a less intense peak at 280 nm, with less significant shoulders in the spectrum at 250, 300 and 360 nm.
  • pump was subjected to treatment with ozone carried in oxygen while being irradiated at the aforementioned frequencies of ultraviolet light.
  • a 360 watt spectrophotometer was used as the source of ultraviolet.
  • Samples of pulp weighing 0.1 gram each (oven dried basis) were irradiated in a closed chamber consisting of two glass cells for a period of two hours. The cells were partially covered with reflective foil so as to increase the energy available to the pulp.
  • the reduction in K number is on the order of two, which-given the low power of the spectrophotometer-is considered to be significant and having the potential to be translated to pilot or commercial scale apparatus.
  • the ultraviolet radiation increased the effectiveness of the ozonation.
  • light at 205 nm had the greatest effect. While commercially available light sources for photo- reactors do not generally emit a single wavelength, it will be sufficient if some of the light is at one or more of the more effective frequencies. Moreover, it is desirable to choose wavelengths at which cellulose does not absorb. By irradiating at absorption peak characteristic to lignin and not to cellulose, the lignin can be made more susceptible to attack by ozone than the cellulose thus tending to cause the ozone to react preferentially with lignin and tending to cause less degradation of cellulose.

Claims (4)

1. Verfahren zum Bleichen von Lignocellulosepulpe mit Ozon, dadurch gekennzeichnet, daß die Pulpe mit Ultraviolettlicht bestrahlt wird, während ein ozonhaltiges Gas mit der Pulpe vermischt wird.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß das Ultraviolettlicht Frequenzen aufweist, die den für Lignin charakteristischen Absorptionspeaks entsprechen.
3. Verfahren nach Anspruch 2, dadurch gekennzeichnet, daß die Frequenz des Ultraviolettlichts in einem Bereich zwischen 205 nm und 360 nm liegt.
4. Verfahren nach Anspruch 3, dadurch gekennzeichnet, daß das Ultraviolettlicht bei einer Frequenz von 205 nm gebündelt wird.
EP83902324A 1982-06-24 1983-06-01 Ozonbleiche aus cellulosematerialien Expired EP0112377B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US39174782A 1982-06-24 1982-06-24
US391747 1995-02-21

Publications (2)

Publication Number Publication Date
EP0112377A1 EP0112377A1 (de) 1984-07-04
EP0112377B1 true EP0112377B1 (de) 1986-11-12

Family

ID=23547770

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83902324A Expired EP0112377B1 (de) 1982-06-24 1983-06-01 Ozonbleiche aus cellulosematerialien

Country Status (5)

Country Link
EP (1) EP0112377B1 (de)
AU (1) AU593763B2 (de)
CA (1) CA1186105A (de)
FI (1) FI73252C (de)
WO (1) WO1984000181A1 (de)

Families Citing this family (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5472572A (en) * 1990-10-26 1995-12-05 Union Camp Patent Holding, Inc. Reactor for bleaching high consistency pulp with ozone
US5181989A (en) * 1990-10-26 1993-01-26 Union Camp Patent Holdings, Inc. Reactor for bleaching high consistency pulp with ozone
US5409570A (en) * 1989-02-15 1995-04-25 Union Camp Patent Holding, Inc. Process for ozone bleaching of oxygen delignified pulp while conveying the pulp through a reaction zone
US5211811A (en) * 1989-02-15 1993-05-18 Union Camp Patent Holding, Inc. Process for high consistency oxygen delignification of alkaline treated pulp followed by ozone delignification
US5188708A (en) * 1989-02-15 1993-02-23 Union Camp Patent Holding, Inc. Process for high consistency oxygen delignification followed by ozone relignification
US5164044A (en) * 1990-05-17 1992-11-17 Union Camp Patent Holding, Inc. Environmentally improved process for bleaching lignocellulosic materials with ozone
US5164043A (en) * 1990-05-17 1992-11-17 Union Camp Patent Holding, Inc. Environmentally improved process for bleaching lignocellulosic materials with ozone
US5441603A (en) * 1990-05-17 1995-08-15 Union Camp Patent Holding, Inc. Method for chelation of pulp prior to ozone delignification
US5520783A (en) * 1990-10-26 1996-05-28 Union Camp Patent Holding, Inc. Apparatus for bleaching high consistency pulp with ozone
US5174861A (en) * 1990-10-26 1992-12-29 Union Camp Patent Holdings, Inc. Method of bleaching high consistency pulp with ozone
EP0515303B2 (de) * 1991-05-24 2001-07-04 Union Camp Patent Holding, Inc. Verfahren zum Bleichen mit Ozon
US5554259A (en) 1993-10-01 1996-09-10 Union Camp Patent Holdings, Inc. Reduction of salt scale precipitation by control of process stream Ph and salt concentration
EP1568819A1 (de) * 2002-11-07 2005-08-31 Nippon Paper Industries Co., Ltd. Verfahren zur verbesserung derverfärbungsresistenz von zellstoff und zellstoff mit verbesserter verfärbungsresistenz
EP1790771A4 (de) * 2004-06-08 2012-10-03 Jujo Paper Co Ltd Zellstoffbleichverfahren
US20090090478A1 (en) * 2007-10-05 2009-04-09 Hollomon Martha G Selectivity improvement in oxygen delignification and bleaching of lignocellulose pulp using singlet oxygen
US7812947B2 (en) 2008-01-21 2010-10-12 Honeywell International Inc. Apparatus and method for measuring and/or controlling paper pulp properties
US7592608B2 (en) 2008-01-22 2009-09-22 Honeywell International Inc. Apparatus and method for measuring and/or controlling ultraviolet-activated materials in a paper-making process
US8049892B2 (en) 2008-01-22 2011-11-01 Honeywell International Inc. Apparatus and method for camera-based color measurements
CN105733878B (zh) * 2016-04-06 2019-04-23 北京化工大学 一种酒糟再发酵的预处理方式

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
UST989185I4 (de) * 1937-06-01
CA973660A (en) * 1972-05-29 1975-09-02 Thomas Joachimides Treatment of cellulosic matter with active nitrogen
FR2255418B1 (de) * 1973-12-21 1976-05-07 Europeen Cellulose
US3920547A (en) * 1974-05-06 1975-11-18 Houston Research Inc Method of destroying cyanides
US4230571A (en) * 1979-01-22 1980-10-28 Dadd Robert C Ozone/ultraviolet water purification

Also Published As

Publication number Publication date
FI73252B (fi) 1987-05-29
EP0112377A1 (de) 1984-07-04
AU1770283A (en) 1984-01-26
WO1984000181A1 (en) 1984-01-19
AU593763B2 (en) 1990-02-22
FI840697A0 (fi) 1984-02-21
FI73252C (fi) 1987-09-10
CA1186105A (en) 1985-04-30
FI840697A (fi) 1984-02-21

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