WO2009015699A1 - Matière fibreuse lignocellulosique issue de plantes annuelles - Google Patents

Matière fibreuse lignocellulosique issue de plantes annuelles Download PDF

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Publication number
WO2009015699A1
WO2009015699A1 PCT/EP2008/002086 EP2008002086W WO2009015699A1 WO 2009015699 A1 WO2009015699 A1 WO 2009015699A1 EP 2008002086 W EP2008002086 W EP 2008002086W WO 2009015699 A1 WO2009015699 A1 WO 2009015699A1
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WIPO (PCT)
Prior art keywords
pulp
chemical solution
digestion
annual plants
otro
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PCT/EP2008/002086
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German (de)
English (en)
Inventor
Esa-Matti Aalto
Hans-Ludwig Schubert
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Voith Patent Gmbh
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Publication date
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Publication of WO2009015699A1 publication Critical patent/WO2009015699A1/fr

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    • 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
    • D21H11/12—Pulp from non-woody plants or crops, e.g. cotton, flax, straw, bagasse
    • 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
    • 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
    • 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
    • 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
    • D21H11/02—Chemical or chemomechanical or chemothermomechanical pulp

Definitions

  • the invention relates to a lignocellulosic pulp of annual plants and a method for producing such a pulp from annual plants.
  • the annual plants include not only grasses or parts thereof (bamboo, straw) but also fibrous plant components such as bagasse or banana peels.
  • Lignocellulosic fibers from annual plants are used, inter alia, for the production of paper and cardboard.
  • a large number of industrially produced lignocellulosic fibers are known, which differ greatly in their properties:
  • wood pulp fibers are (also from annual plants) referred to, which are produced by mechanical defibration of the fiber composite by means of grinding or grinding units.
  • wood pulp hardly any wood substance or lignin is broken down.
  • the biomass originally used is found almost entirely in wood pulp.
  • mechanical defibration of the annual plants they are broken down into fiber bundles in milling aggregates, usually after pre-damping. These fiber bundles are then defibrillated by further grinding into individual fibers.
  • the yield is very high, but also the required grinding energy.
  • the strength of the fibers is very low, even after grinding, because the fibers contain much native lignin and therefore have little bonding potential. They are also greatly reduced by the mechanical defibration, which impairs their recyclability.
  • the wood pulp production requires high energy input.
  • CTMP Chemo-Thermomechanical Pulp
  • TMP Thermomechanical PuIp
  • CTMP used in the technical application usually between 1 - 5% by weight of chemicals based on otro wood to allow partial release of the fiber composite.
  • Wood pulp is generally characterized by low strength properties, in particular low tearing length and particularly low tearing strengths, and high opacity and light scattering with low whiteness and high susceptibility to yellowing.
  • Pulp refers to fibers that are produced by chemical dissolution of the fiber composite from lignocellulosic raw material.
  • chemicals are used which usually act on the biomass under high pressure and high temperature.
  • With more or less extensive removal of the lignin and part of the carbohydrates, ie with significant loss of yield, from annual plants produce fibers with good strength properties, in particular high tenacity and good bleachability to high whiteness and low tendency to yellowing.
  • the energy required to produce the pulp is recovered from the digestion liquor.
  • the lignin content is often not critical. Critical is usually the strength level, as it often limits the application areas. Numerous methods have therefore been developed which attempt to achieve a higher level of strength on the basis of pulp production processes, even for higher lignin fibers.
  • Another method is the bisulfite process, which operates at pH 4.
  • Other processes such as the Kraft process (also called sulfate process) or the soda process, which in themselves for the production of pulp with minimal Lignin content has been developed and tested for its suitability for the production of high yield pulps.
  • the strength level is measured at 500 ml CSF (26 ° SR) and a comparative measurement is made for 300 ml CSF (41 ° SR).
  • cracking lengths breaking length
  • 500 ml CSF 26 0 SR
  • the strength values increase. These already relatively high values are achieved by digestion in the acidic pH range (bisulfite digestion, acid sulfite digestion).
  • the z. B. at 523 ml of CSF have a surfactant factor of about 5000 and a Tear Factor of about 46.
  • the whiteness of such fibers is about 35% ISO.
  • Chemicals determine the process costs, so they are used as sparingly as possible.
  • CTMP pulps are usually manufactured with chemical quantities of 1% to 5%.
  • industrially established processes for the production of high yield fibers eg. As the NSSC process, up to 10% chemicals are used based on the starting material. With such a limited use of chemicals, there is preferably no recovery for the recovery the chemicals installed.
  • the high yield fibers produced by mechanical and / or chemical means are used in particular where it is not absolutely necessary to have a high final whiteness and high whiteness stability. They could open up many more fields of application if the strength level could be increased.
  • This object is achieved with a lignocellulosic pulp of annual plants with a tearing length of more than 4.5 km at 20 0 SR and a lignin content of at least 8% based on the unbleached otro pulp.
  • the above-described pulp has a lignin content of at least 8% based on the otro pulp. This lignin content is determined by determination of the Klason lignin and the acid-soluble lignin (for definition see below). Klason lignin and acid-soluble lignin together give the lignin content of the respective pulp.
  • pulp may also be quite higher, in particular more than 10%, more than 12% or more than 14%.
  • the fibrous material of annual plants according to the invention differs from the prior art in that the fibers show high strength values even with a much lower degree of beating than known fibers of annual plants.
  • the freeness is a measure of the dewatering behavior of a fiber suspension.
  • the fiber is morphologically changed only slightly.
  • Example of straw or bamboo with relatively high lignin content have at 20 0 SR on a structure that is not able to build a good bond to adjacent fibers - and thus an acceptable static strength level.
  • the fiber material of the invention is already at a low degree of beating of 20 0 SR -and thus by little effort to Mahlenergy- able to build a good bond to adjacent fibers.
  • the achievable strength values are for annual plants with a lignin content of at least 8% over 4.5 km. Values of more than 5 km, of more than 6 km and, preferably, more than 7 km of breaking length of 20 0 SR each are readily attainable for these fibrous materials.
  • the pulp of annual plants according to the invention is not only distinguished by high tear lengths. Rather, the strength level is high overall.
  • the annual plant fiber material of the invention having a lignin content of more than 8% at 20 0 and SR based on a sheet weight of 100 g / m 2 fürr adoptedfes- a humidity of at least 45 cN.
  • This tear resistance combined with high breaking lengths even at such unusually low degrees of beating of 20 SR 0 for annual plants is not known from the prior art.
  • the pulp has an unusually high whiteness.
  • values of 40% ISO and more are measured. It is also easily possible to achieve values of over 50% ISO.
  • the lignin is generally considered to be a colorant for the pulp, it is remarkable if, despite the high Lignin content such a degree of whiteness is achieved.
  • the fiber properties improve considerably.
  • Bleaching treatment is required for some applications with higher whiteness requirements; but it also aims to adjust and improve fiber properties.
  • the bleached pulp not only has a significantly higher whiteness of more than 6o% ISO, preferably more than 65% ISO and advantageously more than 70% ISO.
  • the bleaching treatment increases the breaking lengths to more than 5.5 km, preferably to more than 5.5 km, more preferably to more than 7.5 km at 20 ° SR. During the bleaching treatment, the puncture resistance can be stabilized.
  • processes which produce fibers from annual plants with a relatively high lignin content of more than 7%. They provide a yield of 70% or more based on the starting material used. These methods are based on chemical and / or mechanical decomposition of annual plants.
  • This object is achieved with a first process for the production of pulp from annual plants with a lignin content of at least 8%, in each case based on the otro fiber mass.
  • This first method comprises the steps:
  • the first method according to the invention is based on the fact that higher quantities of chemicals are used for the production of high-yield fibers than has hitherto been customary. More than 5% of chemicals are used significantly above the usual chemical quantities for technical pulp production from annual plants. This high use of chemicals yields fibers with good yield and excellent strength properties. Thus, for annual plants with a lignin content of 8% or more at grindings of only 20 0 SR values of more than 4.5 km, but also tear lengths of more than 5 km and more than 6 km are measured. This achieves the desired high level of strength.
  • the fibrous materials produced by the process according to the invention have tear lengths of more than 4.5 km to more than 7 km and tear strengths of more than 45 cN to more than 60 cN, even at degrees in the range of 20 ° SR, based on a sheet weight of 100 g / m 2 .
  • These low levels of grinding are moreover achieved with a low specific requirement of milling energy, which may even be less than 300 kWh / t of pulp.
  • the realization that the high level of strength is already achieved at low degrees of grinding of 20 0 SR and below, is an essential part of the invention.
  • the method according to the invention is also suitable for the production of annual fiber crops having a lignin content of more than 10%, preferably more than 12%, advantageously more than 14%, based on the fiber mass.
  • a specific pH is by no means required for the first method of the invention. Only if, for example, special properties of the pulps (particularly high whiteness, a certain ratio of breaking lengths and tear resistance) are to be achieved with the digestion, it may be useful to add acid or an alkaline component before or during the digestion.
  • a ratio between an alkaline component and sulfur dioxide (SO 2) can be adjusted within a wide range. SO2 is mentioned here as representative of the above-mentioned acidic component. So it can be used instead of SO2 and an acid. Since the possibly added quinone component is used only in minimal amounts, usually well below 1%, it is negligible for setting this ratio.
  • a relationship alkaline component: SO 2 in a range of 4: 1 to 1.6: 1 is well suited to carry out the first method according to the invention and to achieve fibers with high strength properties.
  • a customary, particularly suitable range is between 2: 1 and 1.6: 1.
  • the adaptation of the proportional components takes place depending on the raw material to be digested and the respectively selected process control (digestion temperature, digestion time, impregnation).
  • the object underlying the invention is also achieved with a second process for the production of pulp from lignocellulosic raw material with the steps:
  • the method according to the invention is based on the fact that a minimum of chemicals is used for the production of high-yield fibers. Despite the low use of chemicals, the process according to the invention yields fibers with good yield and excellent strength properties. Thus, for annual plant fiber with a lignin content of more than 8%, which are produced by the second process according to the invention, at grinding degrees of only 20 0 SR values of more than 4.5 km, but also tear lengths of more than 5 km and more measured as 6 km. This achieves the desired high level of strength. In the first method according to the invention, it is believed that the quality of the high yield pulp of annual plants produced there is due to the high chemical input of more than 5% (calculated as NaOH).
  • the second method of the invention works much more environmentally friendly, because a total of a minimum of chemicals is used to produce a particularly high quality and versatile fiber.
  • only a small and therefore particularly economical and environmentally friendly chemical reprocessing is required to complete the cycle of this process. Which of the two methods of the invention is used depends on the raw material to be digested and on the requirements of the pulp to be produced.
  • the second method according to the invention is used according to an advantageous embodiment for the production of high-yield fibers from annual plants. These high strength values are not yet known for pulp from annual plants with a lignin content of more than 8%. However, the high strength level can also be maintained for fibers with an even higher lignin content.
  • the method according to the invention is also suitable for the production of fibrous substances from annual plants with a lignin content of more than 10%, preferably more than 12%, advantageously more than 14%, based on the fiber mass.
  • the fibrous materials produced by the processes according to the invention already have at break levels in the range of 20 ° SR tear lengths of more than 4.5 km and tear strengths of more than 45 cN, based on a sheet weight of 100 g / m 2 .
  • These low levels of grinding are also achieved with a low specific requirement of milling energy lower than 250 kWh / t of pulp.
  • the composition of the chemical solution used for the digestion can be determined in agreement with the wood to be digested and the desired pulp properties.
  • only one sulfite component is used.
  • a sulfide component can be added. Digestion with a sulfite component is not disturbed by the presence of sulfide components.
  • sodium sulfite is usually used, but also the use of ammonium or potassium sulfite or magnesium bisulfite is possible. If high amounts of sulfite are used in the first process according to the invention, it is possible to dispense with the use of an alkaline component, because even without the addition of alkaline components, a high pH is established which promotes the digestion.
  • an acidic and / or an alkaline component can be added for the first process according to the invention.
  • the alkaline component is usually sodium hydroxide (NaOH) is used.
  • NaOH sodium hydroxide
  • carbonates in particular sodium carbonate.
  • the information on chemical quantities of the first invention Digestion process in this document e.g. As for the total use of chemicals or for the distribution of the sulfite component and the alkaline component, unless otherwise stated, each calculated and reported as sodium hydroxide (NaOH).
  • the information on chemical quantities of the second method according to the invention in this document are calculated and reported as sodium sulfite.
  • acids can be added for the first process according to the invention in order to set the desired pH.
  • preference is given to the addition of SO 2, if appropriate in aqueous solution. It is inexpensive and readily available, especially if the spent chemical solution z. B. based on sodium sulfite, after digestion is prepared for further use.
  • anthraquinone between 0.005% and 0.5%, advantageously 0.025-0.2% anthraquinone, particularly advantageously 0.025-0.1% anthraquinone used.
  • Use of anthraquinone of up to 1% also provides the desired effect.
  • a use of more than 3% anthraquinone is usually uneconomical.
  • a chemical solution is prepared for the process according to the invention.
  • aqueous solution stated.
  • organic solvents may be provided.
  • the mixing ratio of water and alcohol can be optimized for the respective raw material in a few experiments.
  • the processes according to the invention can be carried out in a wide pH range.
  • the ratio of alkaline component to acidic component or the use of an acidic or an alkaline component can be adjusted in the first method according to the invention so that at the beginning of the process, a pH between 5.5 and 11, preferably between 5.5 and 10 , is more preferably adjusted between 7.5 and 8.5.
  • the more alkaline pH's between 8 and 11, which are advantageous for the processes of the invention, also favor the effect of the quinone moiety.
  • the methods of the invention are tolerant in pH; In particular, in the second method according to the invention, no or few chemicals are required for the pH adjustment. This has a favorable effect on the costs of chemicals.
  • a pH of between 5.5 and 10 usually between 7.5 and 8.5 in the free-flowing chemical solution and the dissolved organic constituents, by the digestion liquefied.
  • the dissolved organic components are mainly lignosulfonates.
  • the liquor ratio ie the ratio of the amount of otro annual plants to the chemical solution, is set between 1: 1.5 and 1: 6 for both processes.
  • a liquor ratio of 1: 3 to 1: 5 is preferred. In this range, a good and simple mixing and impregnation of the material to be digested is ensured.
  • a liquor ratio of 1: 4 is preferred.
  • the mixing or impregnation of the annual plant chips is preferably carried out at elevated temperatures. Heating of wood chips and chemicals - I4 -
  • up to 170 0 C preferably up to 150 0 C, more preferably up to 130 0 C leads to a rapid and uniform digestion of the annual plants.
  • the optimum time depends, among other things, on the amount of chemicals and the liquor ratio and the type of digestion (liquid or vapor phase).
  • the digestion of the mixed with the chemical solution or impregnated lignocellulosic material is preferably carried out at temperatures between 120 0 C and 190 0 C, preferably between 150 0 C and 180 0 C. For most annual plants are digestion temperatures between 155 0 C and 170 0 C is set. Higher or lower temperatures can be set, but in this temperature range, the energy expenditure for heating up and accelerating the digestion are in an economic relationship to one another. Higher temperatures can also have a negative effect on the strength and whiteness of the fibers.
  • the pressure generated by the high temperatures can be easily absorbed by appropriate design of the digester.
  • the duration of the heating is only a few minutes, usually up to 30 minutes, advantageously up to 10 minutes, in particular when heated by means of steam.
  • the duration of the heating can take up to 90 minutes, preferably up to 60 minutes, z. B. when it is digested in the liquid phase and the chemical solution is to be heated together with the wood chips.
  • the duration of the digestion is chosen primarily depending on the desired fibrous properties.
  • the duration of the digestion can be shortened to up to 2 minutes, z. B. in the case of a vapor phase digestion of annual plants with low lignin content. But it can also be up to 180 minutes, if z. B. the digestion temperature low and the natural lignin content of réelletern annual plants is high. Even if the initial pH of the digestion is in the neutral range, a long digestion time may be required.
  • the digestion time is up to 90 minutes.
  • the digestion time is up to 60 minutes, advantageously up to 30 minutes.
  • a digestion time of up to 60 minutes is particularly suitable for annual plants with low lignin content.
  • a quinone component in particular anthraquinone, allows a reduction of the digestion time to up to 25% of the time required without the addition of anthraquinone. If the use of quinone components is omitted, the digestion time is extended by more than one hour, for example from 45 minutes to 180 minutes, for comparable digestion results.
  • the duration of the digestion is set as a function of the selected liquor ratio.
  • the consumption of chemicals for both inventively proposed methods is determined as the amount of chemicals - based on the originally used amount of chemicals - after removing or separating the chemical solution and, if necessary, the detection of chemical solution, after defibering or in conjunction with a detection the chemical solution is measured.
  • the consumption of chemicals depends on the absolute amount of chemicals used for digestion, based on the otro mass of annual plants to be digested. The higher the use of digestion chemicals, the lower the direct sales of chemicals.
  • 27.5% of chemicals based on otro annual crop mass for the first inventive method for example, only about 30% of the chemicals used are consumed. However, when 15% of chemicals are used per year for otro plants, 60% of the chemicals used are used - l6 -
  • the consumption of chemicals for the first process according to the invention is up to 80%, preferably up to 40%, more preferably up to 40%, advantageously up to 20%, particularly advantageously up to 10% of the chemical use, according to a preferred embodiment of the process during digestion, which is used at the beginning of the digestion.
  • the chemical consumption for producing one ton of pulp is about 6% to 14% sulfite and / or sulfide component and possibly alkaline and / or acidic component and possibly quinone component based on otro pulp (deciduous and coniferous wood ).
  • this quantity of chemicals is sufficient according to the first proposed method in order to produce a pulp having the predetermined properties.
  • the chemical solution that is removed before or after the digestion of annual plants no longer has the initial composition. At least some of the chemicals used for digestion have - as described above - penetrated into the material to be digested and / or has been consumed in the digestion. The unused chemicals can easily be used again for the next digestion. However, it is proposed for both methods of the invention to first determine the composition of the removed chemical solution and then the consumed proportions of z. As sulfite, alkaline component, quinone component or water or alcohol to supplement to restore the predetermined composition for the next digestion. This supplementary step is also called strengthening.
  • the first method according to the invention which is aimed at providing an oversupply of digestion chemicals during the impregnation, can thus be extremely economical despite the initially uneconomic approach of high use of chemicals, because removal or separation and intensification
  • the chemical solution can be carried out easily and inexpensively.
  • the processes according to the invention are specifically controlled so that only as little as possible of the starting material used is broken down or dissolved.
  • the aim is to produce a pulp which has at least 4% lignin based on the otro pulp, preferably of at least 5% lignin, more preferably of at least 6% lignin, advantageously of at least 7% lignin.
  • the yield of the inventive method is at least 70%, preferably more than 75%, advantageously more than 80%, in each case based on the used Annual plants. This yield correlates with the above-mentioned lignin content of the pulp.
  • the original lignin content of the annual plants is specific to the species.
  • the loss of yield in the present process is predominantly a loss of lignin.
  • the proportion of carbohydrates is markedly increased; B. because digestion chemicals in an undesirable manner also bring cellulose or hemicelluloses in solution.
  • a further, advantageous measure is to remove after defibering and optionally grinding the lignocellulosic material, the remaining chemical solution and feed it to a further use.
  • This reuse may include two aspects for both methods in a preferred embodiment.
  • the decomposed during the partial digestion or dissolved in organic material, mainly lignin continue to be used. It is burned, for example, to gain process energy. Or it is prepared to be used elsewhere.
  • the used and unused chemicals are reprocessed so that they can be used for a renewed, partial digestion of lignocellulosic material. This includes the treatment of used chemicals.
  • the chemical solution used is used extremely efficiently. After defibering and optionally grinding, the pulp is washed to displace the chemical solution as much as possible through water.
  • the filtrate produced in this washing or displacement process contains considerable amounts of chemical solution and organic material.
  • this filtrate is supplied to the removed or separated chemical solution before the chemical solution is fortified and fed to the next digestion.
  • the chemicals and organic components contained in the filtrate do not disturb the digestion. To the extent that they still contribute to the delignification during the next digestion, their content is recorded in the chemical solution and taken into account in determining the amount of chemicals required for this digestion.
  • the further contained in the filtrate chemicals behave inert during the pending digestion. They do not bother.
  • the organic constituents contained in the filtrate are also inert. They will continue to be used after the next digestion in the treatment of the chemical solution, either to generate process energy or otherwise.
  • the yield was calculated by weighing the raw material used and the pulp obtained after the digestion or bleaching, in each case dried at 105 ° C. to constant weight (otro).
  • the lignin content was determined as Klason lignin according to TAPPI T 222 om-98.
  • the acid-soluble lignin was determined according to TAPPI UM 250
  • the whiteness was determined by preparing the test sheets according to Zellcheming leaflet V / 19/63, measured according to SCAN C 11:75 with a Datacolor elrepho 450 x photometer; the whiteness is given in percent according to ISO standard 2470.
  • the opacity was determined according to the specifications of Zellcheming-MerkblattVI / 1/66. - The paper technology properties were determined on test sheets, which were prepared according to Zellcheming leaflet V / 8/76. Density was determined according to Zellcheming Regulation V / 11/57. Tear length was determined according to Zellcheming Regulation V / 12/57. The tear resistance was determined according to DIN 53 128 Elmendorf. It is given for a leaf with a leaf weight of 100 g / m 2 .
  • Bagasses-chips are alley after steaming (30 minutes with saturated steam at 105 0 C) with a sodium sulphite digestion solution at a liquor ratio of Ba: digestion solution 1: 3 are added. The total use of chemicals was 27.5% based on otro bagasse chips. The pH at the beginning of the digestion was adjusted to pH 8.5 to 9.5.
  • the impregnated with chemical solution-bagasse chips were heated over a period of 90 minutes at 170 0 C and digested at this maximum temperature for 30 minutes.
  • the open-minded bagasse wood chips were shredded. Aliquots of the pulp so produced were ground for different lengths to determine the strength at different degrees of grinding. The energy required to shred the partially digested bagasse chips was less than 300 kWh / t of pulp.
  • the chemicals used are sulfite and 0.1% anthraquinone.
  • the chemical solution is removed.
  • the chips impregnated with the chemical solution are heated to 170 ° C. with steam in about 5 minutes. This vapor phase at 170 0 C is about 15-20 minutes held. then the steam is released and within 30 seconds, the digester is cooled to 100 0 C, and it is set to ambient pressure.
  • the wood chips are removed from the stove and shredded. Partial quantities of the bagasse pulp so produced are ground and the ground portions and pulp properties are determined for the ground portions.
  • Bagasse wood chips are after a damping (30 minutes with saturated steam at 105 0 C) with a sodium sulfite digestion solution at a liquor ratio of wood: digestion solution 1: 3 added. The total use of chemicals was 15% calculated as sodium sulfite, based on otro bagasse wood chips.
  • the impregnated with chemical solution-bagasse chips were heated over a period of 90 minutes at 170 0 C and digested at this maximum temperature for 30 minutes.
  • the initial pH was in the range of pH 8.0 to 9.5.
  • the free-flowing liquid was removed by centrifugation, collected and analyzed in an arrangement for recycling unused liquid and fortified and thus provided for the next digestion.
  • Intensifying means that the specified sulphite concentration is adjusted again by the addition of fresh or recycled sulphite for the next digestion.
  • the chemical consumption in this first digestion is 82%.
  • the open-minded bagasse wood chips were shredded. Aliquots of the pulp so produced were ground for different lengths to determine the strength at different degrees of grinding. The energy required to shred the partially digested bagasse chips was less than 300 kWh / t of pulp.
  • the yield is 79.2% based on otro pulp.
  • the breaking length was measured at 16 0 SR with 4.5 km, the Tear index at 7.0 mN * m 2 / g.
  • the whiteness was determined after digestion at 41% ISO.
  • the chemicals used are sulfite and 0.1% anthraquinone.
  • the chemical solution is removed.
  • the chips impregnated with the chemical solution are heated to 170 ° C. with steam in about 5 minutes. This vapor phase at 170 0 C is held for 20 minutes. Then the steam is released and within 30 seconds, the cooker is cooled to 100 0 C, and it sets ambient pressure. The wood chips are removed from the stove and shredded. Partial quantities of the bagasse pulp so produced are ground and the grindings and pulp properties are determined for the ground portions.

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Abstract

L'invention concerne une matière fibreuse lignocellulosique non blanchie issue de plantes annuelles, qui présente une longueur de rupture supérieure à 4,5 km à 20 °SR et une teneur en lignine d'au moins 8 % par rapport à la matière fibreuse sèche absolue non blanchie, ainsi qu'une matière fibreuse blanchie issue de plantes annuelles et deux procédés de production de ladite matière.
PCT/EP2008/002086 2007-07-31 2008-03-15 Matière fibreuse lignocellulosique issue de plantes annuelles WO2009015699A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007036382.8 2007-07-31
DE102007036382A DE102007036382A1 (de) 2007-07-31 2007-07-31 Lignocellulosischer Faserstoff aus Einjahrespflanzen

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WO2009015699A1 true WO2009015699A1 (fr) 2009-02-05

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DE102009010696A1 (de) * 2009-02-27 2010-09-02 Voith Patent Gmbh Verfahren zur Herstellung von Magazinpapier
DE102009057208A1 (de) * 2009-11-27 2011-06-01 Technische Universität Dresden Verfahren zur Herstellung von lignozellulosen Papierfaserstoffen sowie daraus gewonnene Papiere, Kartone und Pappen
FI20105799A0 (fi) * 2010-07-13 2010-07-13 Olli Joutsimo Parantunut kemiallisen massan valmistusprosessi
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