EP1951953B1 - A method and an apparatus for removing extractives from fibrous suspension - Google Patents

A method and an apparatus for removing extractives from fibrous suspension Download PDF

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Publication number
EP1951953B1
EP1951953B1 EP06808010.0A EP06808010A EP1951953B1 EP 1951953 B1 EP1951953 B1 EP 1951953B1 EP 06808010 A EP06808010 A EP 06808010A EP 1951953 B1 EP1951953 B1 EP 1951953B1
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EP
European Patent Office
Prior art keywords
fines
containing suspension
additive
extractives
suspension
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP06808010.0A
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German (de)
English (en)
French (fr)
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EP1951953A1 (en
Inventor
Lari Lammi
Petri Lassila
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Valmet Technologies Oy
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Metso Paper Oy
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Publication date
Application filed by Metso Paper Oy filed Critical Metso Paper Oy
Publication of EP1951953A1 publication Critical patent/EP1951953A1/en
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    • 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
    • D21C9/08—Removal of fats, resins, pitch or waxes; Chemical or physical purification, i.e. refining, of crude cellulose by removing non-cellulosic contaminants, optionally combined with bleaching
    • 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
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/02—Agents for preventing deposition on the paper mill equipment, e.g. pitch or slime control

Definitions

  • the invention relates to a method according to the preamble of the appended claim 1 for removing extractives from fibrous suspension.
  • the invention also relates to an apparatus for implementing the aforementioned method in accordance with the preamble of the appended claim 11.
  • the chips are cooked in an alkaline water solution.
  • the fibers and lignin of the wood separate from each other, and lignin dissolves in the cooking solution.
  • the pulp is washed, wherein the fibrous pulp can be separated from the lignin-containing cooking solution.
  • Wood also contains a number of other substances besides lignin and fibers, such as fatty acids and resins, which are commonly called extractives. Most of the extractives dissolve in the cooking solution during the cooking, but a large amount of them still remain in the finished pulp. Especially in hardwood pulps contain large amounts of neutral extractives after the cooking. The extractives in hardwood pulps are mainly formed of unsaturated fatty acids, which are for the most part located in the small-sized parenchymatous cells among the pulp. The extractives can also appear on the surface of the fibers or freely in the solution.
  • Extractives cause numerous problems in the further processing of pulp. They cause yellowing of the pulp in the following pulp processing stages and odour and taste nuisance in paper made of pulp.
  • the free extractives in the solution can accumulate and form deposits, stickiness and precipitations in the pulp processing equipment and its parts. In addition to disturbing the function of the process equipment, the deposits can suddenly disintegrate into the pulp and cause soiling of the pulp.
  • the agglomerated extractives disturb paper manufacturing, because they cause greasy spots in the paper, which hinder the surface-sizing and printing of paper because they do not absorb glue and reject printing ink.
  • the aim is to remove the extractives from the pulp at some stage of the pulping process, before pulp is conveyed to drying or production of paper or paperboard.
  • additives have been used, which are added in the pulping process. They function as surfactants, and make the extractives soluble to the solution in the pulp suspension. As a result, it is possible to remove the extractives from the pulp with the solution, and they do not remain in the pulp.
  • resin acids obtained from the process of cooking softwood, such as tall oil and tall oil soap have been used as additives. These additives have been added into the cooking solution of the pulp.
  • synthetic resin soap is mainly used as an additive in the process of removing extractives, the ratio of the resin acid and fatty acids therein being selected in such a manner that they dissolve extractives efficiently.
  • Such methods are disclosed for example in the Finnish patent application No. 20022270 (corresponding WO publication 2004/057107 ), in which a mixture of resin acid/fatty acid is added in the cooking solution of pulp, especially pulp made of birchwood, and in the Finnish patent application No. 20030846 (corresponding European patent 1484375 ) in which the addition of resin acid/fatty acid is made either in the cooking solution or washing solution of pulp.
  • the method according to the invention is primarily characterized in what will be presented in the characterizing part of the independent claim 1.
  • the apparatus according to the invention is primarily characterized in what will be presented in the characterizing part of the independent claim 10.
  • the invention is based on the idea that a suspension containing fine particles, i.e. fines containing suspension is separated from the pulp obtained from the cooking, and it is treated by means of an additive for removing the extractives therein.
  • the extractives mainly accumulate in the fines of the pulp, even up to 90% of the extractives in the pulp can accumulate in the fines.
  • the amount of fines in the total amount of pulp is typically 3 to 10 %.
  • the removal of the extractives can be intensified further for example by refining or dispersing the fines suspension so that the size of the particles contained therein can be reduced.
  • the parenchymatous cells in the fines disintegrate wherein the additive can affect the extractive and increases its solubility to the solution component of the suspension.
  • a solution contained in the fines-containing suspension is removed from it before treating it, wherein the treatment, such as refining or dispersion is more efficient.
  • the fines-containing suspension separated from the pulp substantially contains all the fines existing in the pulp. Typically it contains noil (fines), parenchymatous cells, pieces of fiber, and sometimes even sand.
  • the fines-containing suspension can be defined in such a manner that it is a suspension in which the particles therein have such a size that they penetrate through a 200 mesh wire, when the suspension has been analyzed by means of methods suitable for fractionating analysis of fibers.
  • One such method is the Bauer-McNett analysis.
  • a side product obtained from the cooking of softwood such as tall oil, tall oil soap or a fatty acid/resin acid mixture.
  • the fatty acid and the resin acid can also be present in the additive in the form of their salts, i.e. in a saponified form. It is also possible to use a synthetic fatty acid/resin acid mixture as an additive.
  • pulp refers to the pulp treated in different stages of producing hardwood pulp.
  • fines-containing suspension refers to a suspension separated from pulp by means of a separator, said suspension containing a solution typical for the pulp producing stage preceding the separator and fine particles.
  • the solution can be for example cooking liquor or pulp washing solution and in addition to fine particles it may also contain for example lignin, cellulose, hemicellulose and inorganic material dissolved from wood. Fine particles are for example noil (fines), parenchymatous cells and pieces of fiber.
  • line refers to any pipe, duct or channel suitable for transferring a solution or a suspension.
  • FIG. 1 shows schematically an apparatus according to the invention for removing extractives from a suspension containing fibers.
  • the pulp from the pulping process is conveyed via a line 1 to separating means, i.e. a separator.
  • the separator is a screen or a precipitator, for example a screw precipitator that functions as a pre-precipitator that is capable of separating the fines-containing suspension from the pulp.
  • a separator it is possible to use for example a screen, a sieve, or a filter.
  • From the separator 2 the fines containing suspension is conveyed via a line 3 to a tank 4.
  • the main pulp flow containing coarser material is conveyed forward in the pulping process via a line 5.
  • an additive is led to the line 3 via first means for adding additive, i.e. an additive line 6.
  • the additive makes the extractives in the fines containing suspension more easily soluble to the solution contained in the suspension.
  • the tank 4 functions as a retention tank that guarantees sufficient reaction time for the additive and the extractives. From the tank 4 the fines-containing suspension that has reacted with the additive is conveyed by means of a pump 7 via a line 8 to the main pulp flow. Part of the suspension that has reacted with the additive can be conveyed to the pulp in line 1, before the separator 2.
  • the solubility of the extractives to the solution contained in the fines-containing suspension can be improved by treating the fines containing suspension so that the size of the particles contained therein is reduced and adding additive to the very fine particles containing suspension thus obtained.
  • the treatment is effected by a treatment device 9 succeeding the first point of additive addition through an additive line 6.
  • the treatment device 9 can be a refiner or a disperser shown schematically in Figs 1 and 2 with broken lines.
  • an additive is conveyed to the suspension via second means for adding additive, i.e. a second additive line 10, which is also marked with broken lines in Figs 1 and 2 .
  • the additive is fed both via the first additive line 6 and the second additive line 10 to the fines-containing suspension travelling in the line 3.
  • the amount of the additive does not increase when compared to the above-described method of removing extractives without the treatment of the fines-containing suspension, because the amount of additive is divided in such a manner that a part of the additive is fed via the first additive line 6 and the rest of the additive is fed via the second additive line 10. It is also possible that the entire amount of additive is fed only via the second additive line 10 and no additive is supplied to the fines-containing suspension before its treatment. If desired, it is also possible to feed the entire amount of additive to the fines-containing suspension via a first additive line 6 before the treatment of the suspension.
  • Fig. 2 shows another embodiment in which the dry matter content of the fines-containing suspension is increased before it is conveyed to treatment.
  • the fines-containing suspension obtained from the separator 2 is conveyed via a line 11 to a solution separator 12 which is a device removing solution from the suspension, such as a filter or a drum falter.
  • the purpose of the solution separator is to increase the dry matter content of the fines-containing suspension led to the treatment device 9, wherein its treatment with the treatment device 9 is easier and more efficient.
  • the solution separator is to increase the dry matter content of the fines-containing suspension led to the treatment device 9, wherein its treatment with the treatment device 9 is easier and more efficient.
  • the fines-containing suspension having higher dry matter content is conveyed via a line 13 to the treatment device 9 and further to the tank 4.
  • an additive is conveyed to the suspension before the treatment device 9 via the additive line 6 and/or after the treatment device 9 via the additive line 10.
  • the suspension that has reacted with the additive is conveyed by means of a pump 7 via a line 8 to the main pulp flow.
  • the solution separated from the fines-containing suspension and obtained from the solution separator 12 is conveyed via a line 14 out of the solution separator 12.
  • the solution separated from the fines-containing suspension can be conveyed either into the line 5 to the coarser material containing main pulp flow that is obtained from the separator 2 or via the line 15 to the pulp flowing in the line 1, before the separator 2. It can also be conveyed via the line to the tank 4 as dilution water.
  • the purpose of the tank 4 disclosed in all the above-described embodiments of the invention is to guarantee sufficient retention time for the extractives in the fines-containing suspension to react with the additive added to the suspension.
  • the reaction time varies from a couple of seconds to a couple of minutes.
  • the size of the tank 4 depends on the amount of suspension to be treated and the point of adding additive before the tank. If the adding of the additive takes place far enough before the tank 4, the reaction with the additive and the extractives takes place already before the tank, wherein the tank functions as a storage or dilution tank for the rest of the process.
  • the separation of the fines-containing suspension from the hardwood pulp and the addition of the additive thereto can be done at any stage of the pulping process. It can be conducted either after the cooking, after the blow tank following the digester, before or after the bleaching stages, or in between bleaching stages. It can also be conducted before or after the secondary classification of the pulp.
  • the most advantageous point to separate the fines-containing suspension from the pulp is after the knot screening following the cooking. The most essential aspect is that the reactions of the extractives after the separation take place in alkaline conditions.
  • the fines-containing suspension must be alkaline, which is typically not a problem in pulping processes, in which process solutions are often alkaline.
  • the apparatus for removing extractives according to the invention is placed at that stage of the pulping process in which the alkalinity of the fines-containing suspension would be too low for extractive removal, it is possible to increase the alkalinity of the suspension by adding sodium hydroxide or white liquor in the fines-containing suspension before adding the additive.
  • the invention can be applied in pulps produced of hardwood such as birch, asp, alder, maple, or a mixture of these, and eucalyptus, acacia, and so-called mixed tropical hardwood.
  • the invention can also be applied in pulps produced of annual plants, such as straw, reed canary grass, reed and bagasse.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)
EP06808010.0A 2005-10-31 2006-10-31 A method and an apparatus for removing extractives from fibrous suspension Not-in-force EP1951953B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20055585A FI123107B (sv) 2005-10-31 2005-10-31 Förfarande och anordning för avlägsning av extraktivämnen från en fiberhaltig suspension
PCT/FI2006/050469 WO2007051907A1 (en) 2005-10-31 2006-10-31 A method and an apparatus for removing extractives from fibrous suspension

Publications (2)

Publication Number Publication Date
EP1951953A1 EP1951953A1 (en) 2008-08-06
EP1951953B1 true EP1951953B1 (en) 2013-04-24

Family

ID=35185291

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06808010.0A Not-in-force EP1951953B1 (en) 2005-10-31 2006-10-31 A method and an apparatus for removing extractives from fibrous suspension

Country Status (4)

Country Link
EP (1) EP1951953B1 (sv)
CA (1) CA2627420C (sv)
FI (1) FI123107B (sv)
WO (1) WO2007051907A1 (sv)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018204906A1 (en) 2017-05-05 2018-11-08 Masonite Corporation Cellulosic articles made from cellulosic materials and methods therefor

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4313790A (en) * 1980-03-31 1982-02-02 Pulp And Paper Research Institute Of Canada Additives for increased retention and pitch control in paper manufacture
AU2619588A (en) * 1987-10-19 1989-05-23 J.M. Huber Corporation Cationic clays and uses in paper and paints
US4964955A (en) * 1988-12-21 1990-10-23 Cyprus Mines Corporation Method of reducing pitch in pulping and papermaking operations
SE465932B (sv) * 1990-03-21 1991-11-18 Bergvik Kemi Ab Foerfarande foer rening av tallharts genom avlaegsnande av fria fettsyror daeri samt tallharts fritt fraan fria fettsyror erhaallet genom detta foerfarande
US5468396A (en) * 1994-03-16 1995-11-21 Pulp And Paper Research Institute Of Canada Centrifugal cleaning of pulp and paper process liquids
FI115978B (sv) * 2000-11-16 2005-08-31 Ciba Sc Holding Ag Förfarande för återvinning av icke-fibrösa substanser från träämne

Also Published As

Publication number Publication date
FI20055585A0 (sv) 2005-10-31
EP1951953A1 (en) 2008-08-06
FI20055585A (sv) 2007-05-01
CA2627420C (en) 2014-06-17
CA2627420A1 (en) 2007-05-10
FI123107B (sv) 2012-11-15
WO2007051907A1 (en) 2007-05-10

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