WO2009111836A1 - Procédé de granulation de fibres de cellulose - Google Patents

Procédé de granulation de fibres de cellulose Download PDF

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Publication number
WO2009111836A1
WO2009111836A1 PCT/AU2009/000299 AU2009000299W WO2009111836A1 WO 2009111836 A1 WO2009111836 A1 WO 2009111836A1 AU 2009000299 W AU2009000299 W AU 2009000299W WO 2009111836 A1 WO2009111836 A1 WO 2009111836A1
Authority
WO
WIPO (PCT)
Prior art keywords
granules
mixture
water
fibres
solid
Prior art date
Application number
PCT/AU2009/000299
Other languages
English (en)
Inventor
Martin Ernegg
Original Assignee
Zeo Ip Pty Ltd
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
Priority claimed from AU2008901275A external-priority patent/AU2008901275A0/en
Application filed by Zeo Ip Pty Ltd filed Critical Zeo Ip Pty Ltd
Publication of WO2009111836A1 publication Critical patent/WO2009111836A1/fr

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21J—FIBREBOARD; MANUFACTURE OF ARTICLES FROM CELLULOSIC FIBROUS SUSPENSIONS OR FROM PAPIER-MACHE
    • D21J1/00—Fibreboard
    • 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
    • D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00—Fibrous raw materials or their mechanical treatment
    • D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
    • D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
    • D21B1/30—Defibrating by other means
    • D21B1/32—Defibrating by other means of waste paper
    • 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
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21J—FIBREBOARD; MANUFACTURE OF ARTICLES FROM CELLULOSIC FIBROUS SUSPENSIONS OR FROM PAPIER-MACHE
    • D21J5/00—Manufacture of hollow articles by transferring sheets, produced from fibres suspensions or papier-mâché by suction on wire-net moulds, to couch-moulds
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/64—Paper recycling

Definitions

  • the disclosure relates to a method for granulating cellulose fibres.
  • the applicant has previously developed a process for producing moulded pieces out of cellulose fibres in which the specific gravity of the moulded pieces approaches that of pure cellulose, 1.5.
  • the process involves finely chopping and grinding cellulose fibres in the presence of water into micro-fibres prior to forming a fibre-water mixture in which the cellulose fibre content is about 1-10% by weight.
  • the process subsequently involves shaping and drying the mixture of cellulose fibres and water into the moulded pieces. Details of the process and the moulded pieces produced by the process are set out in United States Patent 6,379,594. It would be useful to be able to grind and chop the cellulose fibres into micro- fibres at one location and readily transport the micro- fibres to another location where they are used to form the moulded pieces .
  • one manufacturer may produce the micro-fibres for distribution to various other manufacturers to use in producing the moulded pieces at different sites.
  • it is generally not economically viable to store or transport the cellulose micro-fibres when in the fibre- water mixture because: a) a wet mixture will biodegrade or otherwise deteriorate in storage unless it is treated before being stored, which is both difficult and costly; and b) transporting the fibre-water mixture requires the transportation of large volumes of water which has an unacceptable economic cost and environmental impact.
  • a method for granulating cellulose fibres from a solid-liquid mixture comprising water and cellulose fibres comprising:
  • the mixture comprising water and cellulose fibres is prepared in accordance with the processes described in United States Patent 6,379,594, the contents of which are incorporated herein by reference .
  • the solid-liquid mixture to be granulated has a solids content of 1-30% by weight.
  • the solid-liquid mixture to be granulated may have a solids content of 1-6% by weight and in other methods may have a solids content of 7-30% by weight.
  • the solids content of the mixture is at least mostly cellulose fibres and typically all cellulose fibres.
  • the solid-liquid mixture may also comprise a pigment or other colorant which makes up a fraction of the solids content of the mixture.
  • the cellulose fibres in the mixture comprise cellulose micro-fibres. In this embodiment "micro-fibres" means fibres which are 0.1mm to 0.05mm in size.
  • steps (a) and (b) occur simultaneously.
  • step (a) occurs prior to step (b) .
  • the separation step may be a physical separation step.
  • the wet fibres have a solids content of 6-50% by weight, preferably 10-50% by weight, preferably 20-50% by weight, more preferably 30-40% by weight .
  • the method also comprises the step of curling the cellulose fibres.
  • the step of curling the fibres may occur simultaneously with step (a) .
  • step (a) comprises passing the mixture through a screw separator.
  • the screw separator may comprise a screw located in a cage .
  • the screw may rotate inside the cage about its longitudinal axis.
  • the mixture enters one end of the screw.
  • the water separated from the mixture in the screw separator may pass out through the cage.
  • the turning action of the screw of the screw separator may curl the cellulose fibres.
  • step (b) also occurs whilst passing the mixture through the screw separator.
  • the wet granules may be formed by the screw separator dewatering the mixture and preferably pass out of the end of the screw separator opposite to the end in which the mixture enters .
  • step (b) occurs by using a granulator.
  • step (a) comprises using centrifuge .
  • step (a) comprises passing the mixture through a pressure filter, oscillating filter or any other suitable filter.
  • step (a) comprises using capillary extraction.
  • step (c) comprises heating the wet granules to no more than 220 0 C, preferably to a temperature of 14O 0 C to 160 0 C.
  • Step (c) may also comprise extracting the evaporated water.
  • step (c) comprises using a swirl fluidizer to heat the granules and evaporate the water.
  • steps (a) and (b) may occur prior to step (c) . In another embodiment, steps (a) , (b) and (c) occur simultaneously.
  • Steps (a) , (b) and (c) together may comprise spray drying the mixture to form dry granules comprising powder like particles. Any suitable spray drying process may be utilised and typically involves spraying the mixture through at least one nozzle.
  • the mixture has a solids content of 1-20% by weight when fed into the spray dryer, preferably 1-6%.
  • the dry fibres, after drying in the spray dryer may comprise the dried granules in the form of powder like particles.
  • the method may also comprise the step of (d) compressing the granules in larger granules.
  • step (d) comprises the step of pelletising the spray dried granules.
  • any suitable pelletising process may be utilised and typically involves compacting multiple portions of the spray dried granules in dies .
  • the method may also comprise, prior to step (a) , heating the solid-liquid mixture, preferably to a temperature of approximately 160 0 C.
  • the dried granules have a specific gravity of 0.2-1.0, preferably 0.2-0.7, most preferably 0.2-0.4.
  • the dried granules may have a water content of approximately 6-12% by weight.
  • a method for forming an article from granules produced according to the first aspect of the present invention comprising the steps of:
  • the method also comprises the step of leaving the granules to soak in the water, preferably for 1-12 hours, more preferably 3-6 hours.
  • the method also comprises the step of adding pigments or other colorants to the solid- liquid mixture.
  • steps (b) and (c) are carried out in accordance with the steps of shaping and hardening the work piece (article) as described in United States Patent 6,379,594.
  • a method of granulating cellulose fibres from a solid-liquid mixture of cellulose fibres and water has been developed by the applicant.
  • the fibres can be stored for long periods without risk of biodegradation or other deterioration and readily transported between a site where the cellulose fibres are prepared for use in forming an article and another site or sites where the articles are formed, without needing to also transport large volumes of water.
  • the method involves the steps of separating the mixture into wet fibres and water and forming the wet fibres into a plurality of wet granules which are dried.
  • the solid-liquid mixture to be granulated has a solids content of 1-30% by weight.
  • the majority of the solids content and typically all of the solids content in the mixture is cellulose fibres, which have been ground and/or chopped into micro-fibres (0.01-0.5mm in length) .
  • a fraction of the solids content in the mixture may be a pigment or other colorant .
  • the solid-liquid mixture to be granulated may be prepared by any suitable method for refining (ie. grinding and/or chopping) the cellulose fibres, such as LC/HC refining, ultra friction grinding, high pressure homogenizing, extruding, steam explosion, ultra sonic treatment, enzymatic fibre separation and chemical treatment for example.
  • the solid-liquid mixture is prepared in accordance with the processes described in US 6,379,594.
  • the method of the present invention involves physically separating water out of the mixture comprising water and cellulose fibres by passing the mixture through a screw separator.
  • the screw separator comprises a screw which rotates about its longitudinal axis and is located in a cage.
  • the mixture enters one end of the screw separator and is passed through the screw separator by the rotation of the screw. As this occurs, water is removed from the mixture by passing through the cage.
  • the dewatered mixture exits the other end of the screw as wet granules having a solids content of 10-50% by weight, preferably 20-50% by weight, more preferably 30- 40% by weight.
  • the separated water may or may not be collected for recycling.
  • the action of the screw causes the cellulose fibres to be curled.
  • this acts against the cellulose fibres from binding together.
  • the mixture is first separated into wet fibres and water by centrifuge, capillary extraction or by passing the mixture through a pressure filter, oscillating filter or any other suitable filter. After this separation step, the wet granules are formed from the wet fibres using a granulator.
  • the wet granules are formed, they are dried by heating the granules to a maximum temperature of 220 0 C, preferably to a temperature of 140 0 C to 160 0 C, to evaporate the remaining water.
  • the produced granules having a specific gravity of 0.2-1.0, preferably 0.2-0.7, more preferably 0.2-0.4 and a water content of approximately 6-12% by weight.
  • the method for granulating cellulose fibres comprises spray drying the mixture comprising water and cellulose fibres.
  • Any suitable spray drying process may be utilised and typically involves spraying the mixture through at least one nozzle.
  • the mixture has a solids content of 1-20% by weight when fed into the spray drier, preferably 1-6%, and is typically pre-heated to about 16O 0 C.
  • the granules produced by the spray drying are a plurality of powder-like particles.
  • the granules formed in the spray drying process may be subsequently pelletised to form larger granules (pellets) using any suitable pelletising process. Typically, this involves compacting multiple portions of the spray dried mixture in dies..
  • the dried granules are not pelletised but are left in the form of the powder-like particles.
  • the granules which may be in the form of pellets or powder produced according to the above embodiments may be packaged and transported as desired. They may also be used subsequently in a method for forming an article.
  • This method comprises firstly mixing the granules with water to form a solid-liquid mixture comprising cellulose fibres and water.
  • the granules may be left to soak in the water for a period of time, preferably for 1-12 hours, more preferably 3-6 hours. This is to enable the cellulose fibres to completely distribute into the water.
  • Pigments or other colorants may be added to the mixture comprising water and cellulose fibres.
  • the solid-liquid mixture can then be shaped into the article and hardened by drying.
  • the steps of shaping and hardening the article are carried out in accordance with the steps of shaping and hardening the work pieces (articles) as described in United States Patent US6,379,594.
  • compositional percentages are weight percentages unless otherwise specified.
  • a mixture of cellulose fibres and water was prepared firstly by dissolving Amcor RCW80 recovered wastepaper (shown in Figure 1) in water at 25 0 C under stirring conditions of 30rpm for 10 minutes in a drum mixer (shown in Figure 2) . The cellulose concentration in the mixture was 15%.
  • This mixture (pulp) was then refined in a HC Andritz 22" refiner (shown in Figure 3) in accordance with the methods described in US6379594. Refining was conducted for different periods of time to prepare different samples.
  • Sample 1 (Sl) was prepared by refining the pulp for 30 minutes and Sample 2 (S2) was prepared by refining the pulp for 50 minutes.
  • a photograph of S2 as a wet pulp is shown in Figure 4.
  • Sl was dewatered in a fan separator (shown in Figure 5) having a screen slot size of 0.1mm.
  • the fibre content at the outlet of the fan separator was 36%.
  • the stiff pulp from the outlet of the fan separator was then run through a fluid bed drier, specifically a Kason Double-Deck Circular Vibratory Fluid Bed Processor (shown in Figure 6) together with a second stream of Sl which was not dewatered (having a fibre concentration of 15%) .
  • the batch running temperature during operation of the fluid bed drier was 160°.
  • the granules produced by the fluid bed drier had a moisture content of 9% and are shown in Figure 7.
  • the article produced from the regenerated S2 granules had satisfactory properties for use as a structural material, it was noted that the elasticity (Young Modulus) of the regenerated Sl granules was less than that of the as-formed Sl. Without wishing to be bound by theory, it is believed that this was due to insufficient mixing of the dry granules with the water in the high friction mixer which does not sufficiently disentangle the fibres from the entanglement that occurs as they are formed into the dry granules .
  • the specific gravity of the dried granules should preferably not exceed 0.4. Again without wishing to be bound by theory, it is believed that granules which are created with a high density have greater fibre entanglement and thus are more difficult to disentangle upon regeneration by mixing with water, thus making the mixing process longer and less, economical.
  • S2 was dewatered using a fluid press to increase the fibre content to 48% prior to being dried using a Gea swirl fluidizer (shown in Figure 9) .
  • the air inputted to the swirl fluidizer had a temperature of 160 0 C.
  • Dried granules of fibres were produced by the swirl fluidizer having a moisture content of 10%, and are shown in Figure 10.
  • the article produced from the regenerated S2 granules had satisfactory properties for use as a structural material, it was noted that the elasticity (Young Modulus) of the regenerated S2 granules was less than that of the as-formed S2. Without wishing to be bound by theory, it is believed that this was due to insufficient mixing of the dry granules with the water in the high friction mixer which does not sufficiently disentangle the fibres from the entanglement that occurs as they are formed into the dry granules .
  • Example 4 was first diluted by mixing in additional water to reduce the fibre content of the composition to 6% for suitable processing in a spray dryer. This watery composition of S2 was then pre-heated to 160 0 C prior to being spray dried by a Gea Mobile Mino Spray Dryer (shown in Figure 11) at a feed rate of 4L/hr to the nozzle and an atomization pressure of 1.6bar. The outlet temperature from the spray dryer was 95 0 C. Granules in the form of a dry powder (shown in Figure 12) were produced and were found to have a moisture content of 8%.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Processes Of Treating Macromolecular Substances (AREA)

Abstract

L’invention concerne un procédé de granulation de fibres de cellulose à partir d’un mélange solide-liquide qui comprend de l’eau et des fibres de cellulose, le procédé comprenant : a) la séparation du mélange en fibres humides et en eau; et b) la formation des fibres humides en une pluralité de granules humides; c) le séchage des granules.
PCT/AU2009/000299 2008-03-14 2009-03-13 Procédé de granulation de fibres de cellulose WO2009111836A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU2008901275A AU2008901275A0 (en) 2008-03-14 A method for granulating cellulose fibres
AU2008901275 2008-03-14

Publications (1)

Publication Number Publication Date
WO2009111836A1 true WO2009111836A1 (fr) 2009-09-17

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Application Number Title Priority Date Filing Date
PCT/AU2009/000299 WO2009111836A1 (fr) 2008-03-14 2009-03-13 Procédé de granulation de fibres de cellulose

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WO (1) WO2009111836A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012054968A1 (fr) * 2010-10-26 2012-05-03 Zeo Ip Pty Ltd Composition de fibres de cellulose

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2269665A (en) * 1935-07-23 1942-01-13 Herbst Walter Preparation of celulose metal
GB1109895A (en) * 1965-05-10 1968-04-18 Ct Tech De L Ind Des Papiers C Improvements in or relating to the method of and apparatus for treating suspensions of fibres for the formation of aggregates
EP0115898B1 (fr) * 1983-02-04 1987-07-01 KNP Papier B.V. Procédé pour la préparation d'une matière absorbante pour des liquides ou pour des chocs, à partir de boue résiduaire de l'industrie papetière
WO2001058960A1 (fr) * 2000-02-08 2001-08-16 Thüringisches Institut für Textil- und Kunststoff-Forschung e.V. Procede pour la production et le traitement d'une solution cellulosique
US6379594B1 (en) * 1996-09-16 2002-04-30 Zellform Gesellschaft M.B.H. Process for producing workpieces and molded pieces out of cellulose and/or cellulose-containing fiber material
WO2002040766A2 (fr) * 2000-11-10 2002-05-23 Colombiana Kimberly Colpapel S.A. Procede de recyclage de matieres fibreuses non tissees, et fibres synthetiques et matieres fibreuses issues dudit recyclage

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2269665A (en) * 1935-07-23 1942-01-13 Herbst Walter Preparation of celulose metal
GB1109895A (en) * 1965-05-10 1968-04-18 Ct Tech De L Ind Des Papiers C Improvements in or relating to the method of and apparatus for treating suspensions of fibres for the formation of aggregates
EP0115898B1 (fr) * 1983-02-04 1987-07-01 KNP Papier B.V. Procédé pour la préparation d'une matière absorbante pour des liquides ou pour des chocs, à partir de boue résiduaire de l'industrie papetière
US6379594B1 (en) * 1996-09-16 2002-04-30 Zellform Gesellschaft M.B.H. Process for producing workpieces and molded pieces out of cellulose and/or cellulose-containing fiber material
WO2001058960A1 (fr) * 2000-02-08 2001-08-16 Thüringisches Institut für Textil- und Kunststoff-Forschung e.V. Procede pour la production et le traitement d'une solution cellulosique
WO2002040766A2 (fr) * 2000-11-10 2002-05-23 Colombiana Kimberly Colpapel S.A. Procede de recyclage de matieres fibreuses non tissees, et fibres synthetiques et matieres fibreuses issues dudit recyclage

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Derwent World Patents Index; AN 2001-611979, WPAT ABSTRACT ACCESSION NO. *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012054968A1 (fr) * 2010-10-26 2012-05-03 Zeo Ip Pty Ltd Composition de fibres de cellulose

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