WO2018075877A1 - Procédé de création de nanofibrilles de cellulose avec une plaque de raffinage - Google Patents

Procédé de création de nanofibrilles de cellulose avec une plaque de raffinage Download PDF

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Publication number
WO2018075877A1
WO2018075877A1 PCT/US2017/057567 US2017057567W WO2018075877A1 WO 2018075877 A1 WO2018075877 A1 WO 2018075877A1 US 2017057567 W US2017057567 W US 2017057567W WO 2018075877 A1 WO2018075877 A1 WO 2018075877A1
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WO
WIPO (PCT)
Prior art keywords
plate
refining
refiner
cellulose
aperture
Prior art date
Application number
PCT/US2017/057567
Other languages
English (en)
Inventor
Michell CAHILL
Jonathan Nelson
Original Assignee
Cahill Michell
Jonathan Nelson
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 Cahill Michell, Jonathan Nelson filed Critical Cahill Michell
Publication of WO2018075877A1 publication Critical patent/WO2018075877A1/fr

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
    • D21H11/16—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only modified by a particular after-treatment
    • D21H11/18—Highly hydrated, swollen or fibrillatable fibres
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
    • C08B15/00—Preparation of other cellulose derivatives or modified cellulose, e.g. complexes
    • C08B15/08—Fractionation of cellulose, e.g. separation of cellulose crystallites
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L1/00—Compositions of cellulose, modified cellulose or cellulose derivatives
    • C08L1/02—Cellulose; Modified cellulose
    • 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
    • D21C9/001—Modification of pulp properties
    • D21C9/007—Modification of pulp properties by mechanical or physical means
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D1/00—Methods of beating or refining; Beaters of the Hollander type
    • D21D1/20—Methods of refining
    • D21D1/30—Disc mills
    • D21D1/306—Discs

Definitions

  • This disclosure relates to refiner plates used to treat wood and non- wood fibers for the generation of cellulose nanofibrils (CNF) or other highly refined fiber applications.
  • CNF cellulose nanofibrils
  • the functional elements of a refiner are opposing wearable refiner plates whereby at least one of the plates is rotating.
  • the fibers are captured between the bar edge crossing where energy is applied to them.
  • the energy absorbed by the fibers results in a physical modification to the physical properties of the fibers.
  • CNF also commonly referred to as Microfibrillated Cellulose (MFC), Micro-Nano Fibrillafed Cellulose (MNFC), Cellulose Nanomaferials, etc.
  • MFC Microfibrillated Cellulose
  • MNFC Micro-Nano Fibrillafed Cellulose
  • Cellulose Nanomaferials etc.
  • a conventional process for producing CNF pulp uses refiners equipped with various differing refiner plates.
  • the process involves the expending of significant amounts of refining energy applied to bleached or unbleached, softwood, hardwood, virgin or recycled fiber, or other plant fiber.
  • This refining process is usually a recirculation .system whereby the refiner discharge m directed back into an agitated feed tank and then back through the refiner numerous limes.
  • the refiner plate gaps are reduced, to obtain the desired energy.
  • This constant application of energy and shortening of the fiber results in a decreasing ability of the refiner plates to capture the fiber on the bar edges resulting in reduced refining efficiency. This results in potentially significant plate wear along with the additional power applied over time,
  • the current refiner plate design has bars and grooves.
  • the refiner plates can also include a groove obstruction or dam.
  • the dam's function is to force the fiber bundles up on the surface of the plate where the energy is applied.
  • Traditional dams occupy the full width of the groove, although some may occupy only a portion of the full width of the groove.
  • the dams may fully block the flow If they are surface (full height of the bars on either side) or partially block the flow if they are sub-surface or mini dams (stopping below the top surface of the bars). As dams are an .obstruction, they force more fibers up on the surface of the bars.
  • the conventional method of producing CNF is through a multistage refining or grinding process which starts with any number of various pulp types, like, but not limited to, bleached softwood draft: pulp,
  • the pulp supply can be bleached or unbleached, softwood, hardwood, virgin or recycled fiber, or other plant fiber.
  • the refining process is carried out in a way that recirculates all or a portion of the pulp supply through the refiner while applying energy to the fiber to result in an ever increasing fines level in the pulp.
  • the process can be either continuous or batch. As the refining energy is applied the CNF level increases but at a.
  • Short weak fibers are difficult to refine as they cannot support the motor load to apply energy to them, ft is difficult to capture the fibers on the refiner plate surfaces to apply the lead as the short weak: fibers do not floe together.
  • a cellulose nanefibriSs production method comprising the step of: refining pulp to produce cellulose nanofibhls with a refining plate including an aperture at least partial through one of a dam or bar on the surface of the refining plate.
  • F IG. 1 is a single stage conventional CNF system.
  • FIG, 2 is a multistage conventional CNF system.
  • FIG. 36 is a top view of a refiner plate according to this disclosure.
  • FIG. 3A is an enlarged view of a portion of the top of the plate.
  • FIG. 3C is a cross section through the plate.
  • FIG, 3D is a cross section of the plate showing: slots in the tops of bars,
  • FIG. 4A is a top view of another refiner plate according to this disclosure.
  • FIG. 4C is an enlarged view of a portion of the top of the plate
  • FI6, 4B is a cross section through the plate.
  • FIG, 4D is a cross section of the plate shewing slots in dams,
  • FIG. 5 is a cross section of another refiner plate according to this disclosure, showing slots in the sides of bars.
  • FIG, BA is: a top view of another refiner plate according to this disclosure.
  • FIG. 6B is a side cross sectional view of a portion of the plate.
  • FIG. 80 is a front cross sectional view of the plate showing holes in dams in the plate.
  • FIG. 7 illustrates test data where pulp was passed several times or passes through a refiner, with total energy used on the X axis and percent fines level achieved on the Y axis.
  • the fines concentration in the test data is based on a Moffi optical analyzer. Other optical analyzers may measure the fines differently.
  • the critical component parts for a 21 conventional refining system to generate CNF includes a source of raw material 23; slushed: pulp 25 which is discharged into an agitated refiner feed tank 28 with a refiner system feed pump 32 with its suction connection attached to the tanks (FIS, 1),
  • a two-stage refiner system 33 comprises one or more refiners 38 connected in series or parallel or some combination of both with the refining system discharge connected back to the refiner feed tank 28 or forward to an CNF storage tank 40, as shown in FIG 2.
  • the functional elements of a refiner 36 are opposing wearable refiner plates 42 whereby at least one of the plates is rotating and one is stationary. In some embodiments, both refiner plates are rotating,
  • the refiner 36 may be a disk, conical or cylindrical configu ration.
  • the refiner 38 will operate in pumping (pressure rise) or hold back (pressure neutral or loss) mode.
  • a cellulose nanofibrits production method comprising the step of refining pulp to produce cellulose nanofihrils in such a refiner 38 with a refining plate 42, as shown in FIG. 3 including an aperture 48 at least partial through one of a dam 14 or bar 20 on the surface 24 of the refining plate 42, The aperture 48 acts to extrude the fibers (not shown), thereby adding energy to the fibers, resulting in shorter length fibers.
  • the disclosed refiner plate design has bars 20 and grooves 82 extending from the inner and outer locations on the plate, as shown in FIGS- 3 ⁇ 4.
  • Surface or sub-surface- 'dams 14 may be present in all or some of the grooves 62.
  • the dams 14 may he located at any point along the length of the groove 62. For ally given groove 62, there may be one or multiple dams 14 present,
  • Some or all of the dams 14 will have the aperture 48 in the form of a hole(s) 64 (FIB. 6) or a narrow slot(s) 10' (FIG, 4) that is the entire length of the dam 1-4 from the center of the plate 42 to the outside diameter of the plates 42.
  • the slot(s) 10' may be positioned at any point on the surface 63 of the dam 14.
  • the slot 10' will be an area that will cause turbulence and force the fibers up onto or through the bars 20, where energy is applied. A portion of the flow will be forced through the slot(s) 10' in the plate 42 as an additional area where a shear force Is generated and applied to the fibers.
  • An example of a plate 42' of this configuration with slots 10' is shown in FIG. 4.
  • FIG. 6 An example of a plate 42"' of this configuration with holes 64 in a dam 14' is shown in FIG, 6.
  • the slots ID (FIB. 3) on the top of the bars 20 can also be at any angle relative to the sides of the bars 20. In other words, across the top of the bar 20 or along the length of the bar 20,
  • the slot or slots 10 may be in either the inside diameter side or the outside diameter side of the bars or dams, or any combination thereof, These embodiments can be effected alone or in combination together to increase the load applied to fibers in a refiner.
  • a slotted dam will he an area that will cause turbuience and more efficiently foree the fibers up on the bars where energy is applied, with less flow disruption, Additionally, a portion of the flow will be forced through the slot in the plate where a shear force is applied to the fibers:. Slotted surfaces on the; refiner bars will Similarly- cause turbulence and more efficiently force the fibers to more effectively absorb energy load.
  • the disclosed design will incorporate a narrow slof(s) through the middle of a: surface or sub-surface dam ⁇ mini dam) and/or slots or grooves on the: top of the refiner bars. It will be an area that will cause turbulence and force the fibers up on the bars where energy Is applied. Additionally * a portion of the flow will be forcod through the slot creating an added feature in the plate where energy can be applied to the fibers,
  • the dimensions of the plate are as follows.
  • the plate bars are spaced apart by 1.;6mm, with the groove depth between bars is 1.6mm.
  • the plate bars are each about 8,35mm in width, and the width between slots is ,99nim.
  • the slot depth is ,79mm, and the width of the slots in the bars is .79mm.
  • the volume of all of the grooves is about 1 1.43 cubic inches, and the average bar angle is about 28.25 degrees off from straight lines through the piate center, in other embodiments,, other dimensions can be used,
  • the dimensions of the plate are as follows.
  • the bars are 3,96mrn in width, and the; grooves between bars are 3,96mm in width.
  • the grooves between bars are 7.14mm deep, and the overall plate groove volume is 59,21 cubic inches.
  • the average bar angle is about 21.25 degrees off from straight lines through the plate center.
  • the slots in the dams between bars are .78mm deep, and the width of the slots is 1.59mm,. In other embodiments, other dimensions can be used,
  • any or all of the embodiments may be of a cast, machined or fabricated design.
  • slots are cut in the bars and dams using wire electrical discharge machining.
  • FIG. 7 illustrates two attempts to refine pulp into CNF.
  • a convention non-aperture refiner plate was used, And in the Run 31 example, a conventional non-aperture refiner plate was used for several passes through the refiner, and then the refiner plate of this disclosure was used. More particularly, in Run 31 , a first Stage with with a non-aperture refiner plate ran for about 160 minutes at an average flow of 180 GPM using 1100 gallons of pulp, or 23 passes; and then a second Stage with another non-aperture refiner plate ran for about 130 minutes at an average flow .
  • FiG; 7 shows that not only do the : aperture plates of this disclosure allow an over-ail higher power loading at high pulp fines levels, but the aperture plates of this disclosure also allow thai load to be sustained without refiner plate clash and extreme plate wear, as is seen when using conventional refiner plates when refining at high fines levels.
  • FIG, 7 also illustrates how, , with the convention non-aperture refiner plate (Run U28), one can reach about 97% fines after expending about 8300 Gross kWh/t of energy. But note how, with the refiner plate of this disclosure, even greater fine levels can be achieved with more passes. Achieving such fine levels with the non- aperture refiner plate is not possible.
  • Un U28 convention non-aperture refiner plate

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Polymers & Plastics (AREA)
  • Medicinal Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Wood Science & Technology (AREA)
  • Materials Engineering (AREA)
  • Biochemistry (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Analytical Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)

Abstract

Un procédé de production de nanofibrilles de cellulose comprend l'étape consistant à : raffiner de la pâte pour produire des nanofibrilles de cellulose avec une plaque de raffinage comprenant une ouverture au moins partielle à travers l'un d'un barrage ou d'une barre sur la surface de la plaque de raffinage.
PCT/US2017/057567 2016-10-22 2017-10-20 Procédé de création de nanofibrilles de cellulose avec une plaque de raffinage WO2018075877A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201662411594P 2016-10-22 2016-10-22
US62/411,594 2016-10-22

Publications (1)

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WO2018075877A1 true WO2018075877A1 (fr) 2018-04-26

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113710847A (zh) * 2019-03-20 2021-11-26 比勒鲁迪克斯那斯公司 生产方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5975438A (en) * 1995-11-14 1999-11-02 J & L Fiber Services Inc. Refiner disc with curved refiner bars
US6607153B1 (en) * 1998-08-19 2003-08-19 Durametal Corporation Refiner plate steam management system
US20070084952A1 (en) * 2003-10-06 2007-04-19 Hakan Sjostrom Refining surface and a blade segment for a refiner
US20130303749A1 (en) * 2010-11-30 2013-11-14 Upm-Kymmene Corporation Method and a system for producing nanocellulose, and nanocellulose
US20130320119A1 (en) * 2012-05-30 2013-12-05 Andritz Inc. Refiner plate having a smooth, wave-like groove and related methods

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5975438A (en) * 1995-11-14 1999-11-02 J & L Fiber Services Inc. Refiner disc with curved refiner bars
US6607153B1 (en) * 1998-08-19 2003-08-19 Durametal Corporation Refiner plate steam management system
US20070084952A1 (en) * 2003-10-06 2007-04-19 Hakan Sjostrom Refining surface and a blade segment for a refiner
US20130303749A1 (en) * 2010-11-30 2013-11-14 Upm-Kymmene Corporation Method and a system for producing nanocellulose, and nanocellulose
US20130320119A1 (en) * 2012-05-30 2013-12-05 Andritz Inc. Refiner plate having a smooth, wave-like groove and related methods

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113710847A (zh) * 2019-03-20 2021-11-26 比勒鲁迪克斯那斯公司 生产方法
CN113710847B (zh) * 2019-03-20 2023-08-11 比勒鲁迪克斯那斯公司 生产方法

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