WO1999041448A1 - Procede de lessivage, simple et ecologiquement inoffensif, de matieres fibreuses non derivees du bois - Google Patents

Procede de lessivage, simple et ecologiquement inoffensif, de matieres fibreuses non derivees du bois Download PDF

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Publication number
WO1999041448A1
WO1999041448A1 PCT/US1999/002643 US9902643W WO9941448A1 WO 1999041448 A1 WO1999041448 A1 WO 1999041448A1 US 9902643 W US9902643 W US 9902643W WO 9941448 A1 WO9941448 A1 WO 9941448A1
Authority
WO
WIPO (PCT)
Prior art keywords
source material
solution
fiber source
pulp
papermaking pulp
Prior art date
Application number
PCT/US1999/002643
Other languages
English (en)
Inventor
Medwick V. Byrd, Jr.
Original Assignee
North Carolina State University
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 North Carolina State University filed Critical North Carolina State University
Priority to AU26617/99A priority Critical patent/AU2661799A/en
Publication of WO1999041448A1 publication Critical patent/WO1999041448A1/fr

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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
    • D21C9/1026—Other features in bleaching processes
    • D21C9/1042—Use of chelating agents
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00—Fibrous raw materials or their mechanical treatment
    • 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
    • D21C1/00—Pretreatment of the finely-divided materials before digesting
    • D21C1/08—Pretreatment of the finely-divided materials before digesting with oxygen-generating compounds
    • 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
    • D21C3/00—Pulping cellulose-containing materials
    • D21C3/02—Pulping cellulose-containing materials with inorganic bases or alkaline reacting compounds, e.g. sulfate processes
    • 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
    • D21C5/00—Other processes for obtaining cellulose, e.g. cooking cotton linters ; Processes characterised by the choice of cellulose-containing starting materials

Definitions

  • the present invention relates generally to a pulping process for
  • this invention relates to a simple and environmentally benign process for chemi-mechanical pulping of kenaf
  • woody plants are not the only source of fibers for papermaking. There are a variety of nonwood annual and perennial plants which produce fibers
  • pulps are usually more expensive on a per-ton basis than wood pulps.
  • agricultural residues such as wheat straw that are otherwise burned off fields
  • nonwoods have a low bulk density compared to trees, and thus, can be hard to store and transport;
  • nonwoods may require large amounts of herbicides and pesticides as compared to trees; (4) nonwoods generally require smaller mills due to transport
  • nonwoods comprise fibers that may be shorter, more slender, or weaker than wood fibers.
  • mini-mill processes.
  • a suitable mini-mill would produce about 50-300
  • mills Although the larger mills are quite efficient, finding locations and obtaining environmental permits for them is becoming increasingly difficult. In addition, the ability to economically transport low-density nonwood fiber
  • Pulps from full chemical processes are characterized by high purity (high
  • Sheet flexibility is also reduced because lignin is left in the fiber walls. Overall, mechanical pulps are useful only for low-end paper grades like newsprint or
  • nonwoody materials for use in feeding domestic animals, humans, or in the
  • This mill should use a simple process, with low operating and capital costs, to maintain economies of scale equal to those of -7- the mega-mill. The process should render the mill almost invisible to the
  • process comprises the steps of washing the nonwood fiber source material with
  • washing solution impregnating the nonwood fiber source material with a pulping solution at ambient temperature and at atmospheric pressure; and mechanically shearing the nonwood fiber source material to form a
  • the process further comprises compressing the nonwood fiber source material to form a compressed plug after washing the
  • nonwood fiber source material and prior to impregnating the nonwood fiber
  • period of time such as thirty minutes, so that vessel sizes are manageable.
  • Figure 1 is a schematic representation of the primary nonwoods pulping process of this invention
  • Figure 2 is a schematic representation of the nonwoods pulping process
  • Figure 3 is a schematic representation of the nonwoods pulping process
  • Figure 4 is a schematic representation of the nonwoods pulping process of this invention wherein secondary refining of the pulp by treatment with acidified water/chelant and by a bleaching solution is depicted.
  • Kenaf can be a grown in almost every state of the United States.
  • another candidate is
  • candidate agricultural residues and fiber crops include wheat straw, rice straw, corn stalks, bagasse (sugar
  • a small side stream 20 from sump 18 is bled off and sent either to a water treatment system or to some other non-process use. It is preferred that
  • water stream 22 is then introduced into the process to compensate for the loss in stream 20.
  • chelating agent such as diethylene-triamine-pentaacetic acid (DTPA)
  • ethylene-diamine-tetraacetic acid can be maintained in the wash filtrate.
  • EDTA ethylene-diamine-tetraacetic acid
  • the chelating agent sequesters and ties up metal ions, such as iron,
  • agent provides for improved washing of the fiber.
  • chelation can be aided by the use of acid to reduce the pH of the
  • heating can be added to the wash filtrate system to improve washing and -12- chelation of metals. However, care should be used to avoid heating the raw
  • Filtrate bled off from the sump 18 will contain dirt, silt, sand, fine fiber
  • the waste material is considered completely organic and chemical-free.
  • washing screw 12 is not essential to the process of
  • any method of thoroughly wetting the raw material 10 prior to passing it through the impregnation screw may be acceptable. However, for some products, removal of fine contaminants (e.g. sand), plant extractives, and
  • nonwood fiber source material from washing screw 12 falls into infeed hopper 24.
  • the housing 26 of infeed hopper 24 is
  • a short drainage conveyor 28 may be
  • Impregnation screw 32 is manufactured so that the diameter of the overall screw remains the same while the shaft diameter increases and the open flight area decreases. The effect of screw 32
  • washed material is to compress it, reducing volume to one fourth or less of original volume.
  • a housing 34 surrounds screw 32. Housing 34 is perforated so that as
  • Waste material expelled from impregnation screw 32 is in the form of a
  • the waste material may be further thickened and recycled to the
  • Impregnation screw 32 also exerts an initial mechanical action on the nonwood fiber source material. Long bast fibers within the material are twisted
  • nonwood fiber source material is formed.
  • the plug is pushed by screw 32 into
  • impregnation vessel 38 a small box just inside of a larger reaction vessel 40.
  • Vessel 38 is kept filled with chemical pulping solution.
  • pulping solution it is meant any solution capable of breaking down lignin in the fibers
  • reaction vessel 40 The level of material is maintained in reaction vessel 40 so that the
  • total residence time within vessel 40 is 20-30 minutes. Longer residence times
  • the chemical agents used in the pulping solution preferably comprise
  • hydroxide serves as a source of alkali, which breaks down lignin in the fibers
  • Magnesium carbonate is used as a source
  • magnesium carbonate and similar compounds is optional, depending on the fiber type and the number and type of metal ions present in the water system being used.
  • stage may be added.
  • addition of chelant in the pulping solution may increase brightness of the final
  • the pulping solution preferably comprises: (a) some
  • the pulping solution can -16- comprise small quantities of metal sequestering and chelating agents, such as magnesium compounds or VINKEEL t 2000.
  • the preferred temperature thus ranges from about 20°C to about 40°C.
  • a discharge screw 44 is located at the bottom
  • Screw 44 feeds material into a refiner feed screw 46, which in turn feeds the material into the eye of a twin-disk refiner 48.
  • a suitable refiner feed screw 46 feeds the material into the eye of a twin-disk refiner 48.
  • refiner 48 is a SUNDS DEFIBRATOR CD-300 tm , with 12-inch
  • a 300-HP motor rotates one plate 50 at 3600 RPM, while the other
  • the shaft driving the rotating plate 50 is movable, so that the gap between plates 50 and 52 may be reduced to increase refining intensity or increased to reduce refining intensity. Refining intensity is
  • Long bast macrofibers are separated into smaller unit fibers, while the core pieces are both pulverized and separated into fibers.
  • Centrifugal force causes the refined nonwood fiber source material to be flung out of refiner 48 through a bottom port 54. The material at this point
  • Friction in refiner 48 can cause the pulp to be heated uplo 50- 60°C at the discharge. Residual alkali typically gives the pulp a pH of about
  • a transfer conveyor 56 which takes the pulp into a feed chute 58 for a secondary refiner 60, which is identical to the primary refiner 48, and includes
  • Example 1 Lower Brightness (55-60 ISO)
  • This brightness range is generally suitable for low-end products like
  • the brightness of the pulp emerging from the refiners is adequate, and no further bleaching is necessary.
  • the unit ISO is
  • newsprint and lower-brightness papers are in the 55-70% brightness range. -19- Washing of the pulp is not necessary after refining. Instead, the pulp is mixed with sulfuric acid until a pH of 7-7.5 is achieved, thereby neutralizing the pulp
  • neutralization is accomplished by injecting acidified dilution water 68 into the flat zone of the secondary refiner plates 62
  • Additional acidified water 70 may be
  • the pulp is
  • the concentration of acid in the dilution water 68 is adjusted so that the pH of the pulp at the bottom of standpipe 72 is 7-7.5.
  • the pulp may be discharged from the standpipe 72
  • Example 2 Moderate Brightness (60-70 ISO)
  • This brightness range is suitable for newsprint and some illustrative
  • Solution 74 is injected into secondary refiner 60 as dilution water between plates 62 and 64.
  • Pulp pH should be
  • the peroxide bleaching reaction should take place at 80-90 °C. Heating for this reaction is accomplished by heating the injected chemical solution and/or injecting steam into refiner 60.
  • the pulp is ready for final refining/beating, screening, cleaning, papermaking, etc.
  • This brightness range may be accomplished using the
  • chelation is accomplished by injecting chelating
  • solution 84 contains a small quantity of chelating agent, similar to that used for impregnation.
  • Standpipe 72 provides volume sufficient for a residence time of 30 minutes.
  • washing is not required to achieve higher brightness level. If utilized, a washing step will reduce the amount of alkali
  • chelating agent Sodium silicates, which tend to stabilize peroxide compounds, may also be added.
  • the solution used for impregnation is a suitable example. The pulp is then introduced into a standard steam mixer 92, where it is heated
  • Chelant depends on agent; 0.2
  • Impregnation temperature ambient (preferably ranging from 20-
  • Reaction temperature ambient (preferably ranging from 20-40°C)
  • pulp freeness refers to the drainage rate of pulp, or how “freely” the pulp will give up its water.
  • Freeness is important in papermaking in that, if the freeness is too low, it is not possible to remove enough water on the paper machine to achieve good sheet
  • pulp freeness after first refiner ranges from approximately 350-400 ml CSF. Further, pulp freeness after secondary refining and neutralization ranges
  • the term "high freeness” is meant to refer to a freeness of about 250 ml CSF and above.
  • process of this invention incorporates washing, cleaning and metals removal
  • the process of this invention provides for the impregnation
  • the peroxide brightening reaction is competing with a simultaneous alkaline
  • Example 3 the instant process provides for the production of a pulp that is
  • the instant process provides for the production of a good quality pulp at relatively high yield (65% of raw material recovered as useable pulp)
  • the instant process is a full pulping and bleaching process that
  • nonwood materials for use in papermaking.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Paper (AREA)

Abstract

L'invention concerne un procédé de production de pâte à papier, approprié à la fabrication de papier, à partir d'une plante de source fibreuse, non dérivée du bois. De telles matières fibreuses comprennent le kenaf et le chanvre industriel. Ce procédé comprend les étapes consistant à laver ladite matière fibreuse, au moyen d'une solution de lavage, dans une vis de lavage (12), à comprimer cette matière afin de former un bouchon comprimé, dans une vis d'imprégnation (32), à imprégner ce bouchon comprimé, au moyen d'une solution de lessivage, à température ambiante et sous pression atmosphérique, dans une cuve d'imprégnation (38), à fournir, au niveau d'un orifice inférieur (54), cette matière fibreuse imprégnée afin de former une pâte destinée à la fabrication de papier. L'invention concerne également un traitement supplémentaire de la pâte destinée à la fabrication de papier, au moyen d'une chélation acide, ou d'un blanchiment, ou des deux.
PCT/US1999/002643 1998-02-11 1999-02-09 Procede de lessivage, simple et ecologiquement inoffensif, de matieres fibreuses non derivees du bois WO1999041448A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU26617/99A AU2661799A (en) 1998-02-11 1999-02-09 Method for the simple and environmentally benign pulping of nonwood fibrous materials

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US2188898A 1998-02-11 1998-02-11
US09/021,888 1998-02-11

Publications (1)

Publication Number Publication Date
WO1999041448A1 true WO1999041448A1 (fr) 1999-08-19

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AU (1) AU2661799A (fr)
WO (1) WO1999041448A1 (fr)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1056902A1 (fr) * 1998-02-19 2000-12-06 International Paper Company Procede de production de pate chimique a partir de plantes herbacees
US6302997B1 (en) 1999-08-30 2001-10-16 North Carolina State University Process for producing a pulp suitable for papermaking from nonwood fibrous materials
WO2003004765A1 (fr) * 2001-07-06 2003-01-16 Biotek Sp. Z O.O. Masses de cellulose non ligneuses et procede de production
EP1299595A1 (fr) * 2000-06-29 2003-04-09 Bncompulp Co., Ltd. Procede de preparation de la pate a papier a partir de tiges de mais
WO2005042838A1 (fr) * 2003-10-30 2005-05-12 Biotek Sp. Z O.O. Pates a papier fibreuses blanchies et non blanchies, et methode de production de ces pates
WO2009154898A1 (fr) * 2008-06-20 2009-12-23 International Paper Company Composition et feuille d'impression présentant des propriétés optiques améliorées
EP2152945A1 (fr) * 2007-05-23 2010-02-17 Alberta Research Council, Inc. Procédé de décortication
WO2010139589A1 (fr) * 2009-06-02 2010-12-09 Akzo Nobel Chemicals International B.V. Procédé pour produire une pâte mécanique
US7934454B2 (en) 2003-11-12 2011-05-03 Kee Action Sports I Llc Projectile, projectile core, and method of making
EP3333311A1 (fr) * 2016-12-08 2018-06-13 Valmet AB Procédé d'imprégnation de biomasse et dispositif d'imprégnation de biomasse
US11162216B2 (en) 2016-12-08 2021-11-02 Valmet Ab Method for treating biomass and device for treating biomass
US20220162799A1 (en) * 2015-12-15 2022-05-26 Betulium Oy Method for producing parenchymal cell cellulose
US11371186B2 (en) 2016-12-08 2022-06-28 Valmet Ab Method and system for treating biomass

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5002635A (en) * 1985-09-20 1991-03-26 Scott Paper Company Method for producing pulp using pre-treatment with stabilizers and refining

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5002635A (en) * 1985-09-20 1991-03-26 Scott Paper Company Method for producing pulp using pre-treatment with stabilizers and refining

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1056902A1 (fr) * 1998-02-19 2000-12-06 International Paper Company Procede de production de pate chimique a partir de plantes herbacees
EP1056902A4 (fr) * 1998-02-19 2001-05-30 Int Paper Co Procede de production de pate chimique a partir de plantes herbacees
US6348127B1 (en) 1998-02-19 2002-02-19 International Paper Company Process for production of chemical pulp from herbaceous plants
US6302997B1 (en) 1999-08-30 2001-10-16 North Carolina State University Process for producing a pulp suitable for papermaking from nonwood fibrous materials
EP1299595A1 (fr) * 2000-06-29 2003-04-09 Bncompulp Co., Ltd. Procede de preparation de la pate a papier a partir de tiges de mais
EP1299595A4 (fr) * 2000-06-29 2004-06-23 Bncompulp Co Ltd Procede de preparation de la pate a papier a partir de tiges de mais
US7186316B1 (en) 2000-06-29 2007-03-06 Cp & P Co., Ltd. Method for preparing pulp from cornstalk
WO2003004765A1 (fr) * 2001-07-06 2003-01-16 Biotek Sp. Z O.O. Masses de cellulose non ligneuses et procede de production
WO2005042838A1 (fr) * 2003-10-30 2005-05-12 Biotek Sp. Z O.O. Pates a papier fibreuses blanchies et non blanchies, et methode de production de ces pates
US7934454B2 (en) 2003-11-12 2011-05-03 Kee Action Sports I Llc Projectile, projectile core, and method of making
EP2152945A4 (fr) * 2007-05-23 2014-09-24 Alberta Innovates Technology Futures Procédé de décortication
EP2152945A1 (fr) * 2007-05-23 2010-02-17 Alberta Research Council, Inc. Procédé de décortication
US9745700B2 (en) 2008-06-20 2017-08-29 International Paper Company Composition and recording sheet with improved optical properties
WO2009154898A1 (fr) * 2008-06-20 2009-12-23 International Paper Company Composition et feuille d'impression présentant des propriétés optiques améliorées
EP2787120A1 (fr) * 2008-06-20 2014-10-08 International Paper Company Feuille d'impression présentant des propriétés optiques améliorées
US8906476B2 (en) 2008-06-20 2014-12-09 International Paper Company Composition and recording sheet with improved optical properties
WO2010139589A1 (fr) * 2009-06-02 2010-12-09 Akzo Nobel Chemicals International B.V. Procédé pour produire une pâte mécanique
US20220162799A1 (en) * 2015-12-15 2022-05-26 Betulium Oy Method for producing parenchymal cell cellulose
EP3333311A1 (fr) * 2016-12-08 2018-06-13 Valmet AB Procédé d'imprégnation de biomasse et dispositif d'imprégnation de biomasse
WO2018104489A1 (fr) * 2016-12-08 2018-06-14 Valmet Ab Procédé d'imprégnation de biomasse et dispositif d'imprégnation de biomasse
CN109996921A (zh) * 2016-12-08 2019-07-09 维美德公司 浸渍生物质的方法和浸渍生物质的装置
US11162216B2 (en) 2016-12-08 2021-11-02 Valmet Ab Method for treating biomass and device for treating biomass
US11186949B2 (en) 2016-12-08 2021-11-30 Valmet Ab Method for impregnating biomass and device for impregnating biomass
US11371186B2 (en) 2016-12-08 2022-06-28 Valmet Ab Method and system for treating biomass
CN109996921B (zh) * 2016-12-08 2022-09-27 维美德公司 浸渍生物质的方法和浸渍生物质的装置

Also Published As

Publication number Publication date
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