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WO1996002699A1 - Procede et dispositif se rapportant au blanchiment a l'aide de peroxyde sous pression - Google Patents

Procede et dispositif se rapportant au blanchiment a l'aide de peroxyde sous pression Download PDF

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Publication number
WO1996002699A1
WO1996002699A1 PCT/SE1994/001111 SE9401111W WO9602699A1 WO 1996002699 A1 WO1996002699 A1 WO 1996002699A1 SE 9401111 W SE9401111 W SE 9401111W WO 9602699 A1 WO9602699 A1 WO 9602699A1
Authority
WO
WIPO (PCT)
Prior art keywords
pulp
reactor
bleaching
stand pipe
arrangement
Prior art date
Application number
PCT/SE1994/001111
Other languages
English (en)
Inventor
Lennart Gustavsson
Original Assignee
Kvaerner Pulping Ab
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 Kvaerner Pulping Ab filed Critical Kvaerner Pulping Ab
Priority to AU13934/95A priority Critical patent/AU1393495A/en
Publication of WO1996002699A1 publication Critical patent/WO1996002699A1/fr

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/10—Bleaching ; Apparatus therefor
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/10—Bleaching ; Apparatus therefor
    • D21C9/16—Bleaching ; Apparatus therefor with per compounds
    • D21C9/163—Bleaching ; Apparatus therefor with per compounds with peroxides

Definitions

  • the present invention relates to a method and to an arrange- ment pertaining to the bleaching of pulp with pressurized peroxide, preferably chlorine-free bleaching of chemical pulp in association with its production, wherein a specific digester technique (steam/vapour phase digester) is used to achieve a relatively inexpensive and well-functioning pressurized peroxide stage.
  • a specific digester technique steam/vapour phase digester
  • Chlorine-free bleaching with the aid of hydrogen peroxide is known from Swedish Patent 8902058-0 (EKA Nobel AB) , in which the so-called Lignox process is described.
  • One object of the inventive method is to provide optimal operating conditions from an energy aspect and cost aspect, among other things.
  • This object is achieved in accordance with the invention preferably by using a standing reactor, preferably a tall and narrow reactor (a so-called tower) into which the pulp is introduced at its upper end.
  • a Kvaerner's vapour phase digester or some similar vessel having a corresponding function and essentially corresponding dimen- sions, preferably exceeding 3 m 2 , can be used in the bleach ⁇ ing process.
  • the diameter of the reactor vessel will be implicitly large at higher production levels.
  • a further object of the invention is to obtain a so-called plug flow in the reactor during the process.
  • the level of pulp at the top of the reactor should be as uniform as possible.
  • plug flow is meant a flow in which each part of the flow moves as a solid body under translatory motion, i.e. in the case of a tall and narrow vessel the flow properties will vary along the vessel.
  • This can be achieved in accordance with the inventive method by using in the arrangement a pulp distributing or spreading device which functions to distribute the pulp over essen- tially the whole of the cross-sectional area of the contain ⁇ er, and by introducing the pulp at an appropriate rate.
  • a spreader provided at the top of the reactor vessel, preferably a pulp spreader or distributor of the kind described in our own Patent Application 9303019-5.
  • the spreader functions to spread the pulp delivered to the vessel in a manner to form a generally uniform layer over the surface in the reactor, and it is possible to maintain a desired type of flow in the reactor by feeding-in the pulp generally uniformly.
  • the arrangement includes a pulp-spread- ing impeller which includes pulp-spreading blades or vanes and which is rotatably mounted in the vessel, impeller drive means, and an inlet for delivering pulp to the impeller.
  • the arrangement may optionally also include a further inlet for the optional introduction of chemicals.
  • Another object of the invention is to reduce the pressure requirement on the chemical pumps to the lowest possible level, therewith affording advantages with respect to both power and maintenance.
  • This object is achieved in accordance with the invention by delivering the necessary bleaching chemicals, with the exception of the peroxide, for instance to the upper end of a stand pipe arranged upstream of the reactor in which the bleaching process takes place, prior to having reached the system pressure, and therewith admixing the chemicals with the pulp to be bleached with the aid of an MC pump, for example. If necessary, further devices may be provided for mixing the supplied chemicals with the pulp.
  • the peroxide is preferably delivered to the bottom end of the same stand pipe, prior to the pulp passing an MC pump. This positioning of the supply is advantageous from many aspects.
  • the further mixing equipment can be placed upstream of the reactor, in the conduit that leads to the top of the reactor vessel or alternatively in a pre-reactor, and the admixture of the chemicals can be effected at the top of the reactor with the aid of the aforedescribed pulp-spreading arrange ⁇ ment.
  • a further object of the invention is to enable the desired temperature to be reached with the aid of low pressure steam, i.e. steam at a pressure lower than 6 bars ⁇ e) , preferably lower than 5 bars (e) , normally 3-5 bars (e) .
  • the steam delivered when practicing this special technique in accordance with the invention can be so-called low pressure steam as opposed to the technique used at present in which steam at intermediate pressure is used for the purpose of heating the pulp to a desired temperature (preferably above 100°C) prior to the bleaching process.
  • Intermediate pressure steam is expensive whereas low pressure steam is much cheaper, and consequently the use of low pressure steam constitutes an important advantage.
  • the intermediate pressure steam earlier used has also been used to raise the system pressure in addition to heating the pulp, although as distinct from the present invention, the delivery of the bleaching charges has earlier taken place within that part of the bleaching arrangement in which a desired bleaching pressure has been maintained.
  • Final degassing of the pulp is preferably carried out in a downstream stand pipe provided with a flue stack.
  • inventive method and the inventive arrangement enable the use of mixing devices which generate unnecessary drops in pressure to be avoided. Limitations to reactor pressure caused by said devices can thus also be avoided.
  • the inventive method and inventive arrangement also enable intermediate pressure steam to be replaced with low pressure steam. Because when practicing the inventive method pulp is introduced into the reactor vessel from above, the pressure of the vessel contents is increased to a significant extent such that low pressure steam will suffice in achieving desired process conditions. The inventive method is thus able to considerably reduce operation costs.
  • inventive method and the inventive arrangement for carrying out the method simplify the admixture of chemicals with the pulp, less demanding mixer equipment is required, which in turn lowers the specific energy input required to effect the mixing process.
  • Fig. 1 illustrates a first arrangement for carrying out the inventive method
  • Fig. 2 illustrates a second arrangement for carrying out the inventive method
  • Fig. 3 is a partial cross-sectional view of the upper part of a paper pulp treatment container having mounted on the top thereof a first embodiment of a pulp-spreading device in accordance with the invention
  • Fig. 4 is a partial cross-sectional view of the upper part of a paper pulp treatment container having mounted on the top thereof a second embodiment of a pulp-spreading device in accordance with the invention
  • Fig. 5 is a view of the inventive arrangement from above.
  • the arrangement shown in Fig. 1 includes a stand pipe 101 for feeding chemicals to the pulp.
  • a stand pipe 101 for feeding chemicals to the pulp.
  • Mounted at the bottom end of the stand pipe is an MC pump 102 which, in addition to its standard function, also admixes the chemicals with the pulp.
  • a peroxide inlet is provided at the bottom end of the stand pipe 101.
  • the pulp is fed from the MC pump to the upper end of a reactor 103, where it is introduced into the reactor.
  • Pulp feed is controlled by a valve 112.
  • a connector or connectors is/are provided at the upper end of the reactor for the delivery of steam and optionally also oxygen gas.
  • the delivery of steam to the reactor is controlled by a tempera ⁇ ture sensor unit TIC which is intended to sense the tempera- ture in the upper end of the reactor.
  • the temperature sensor unit coacts with a valve 111 incorporated in the steam delivery conduit.
  • a mixing device 104 is mounted at the upper end of the reactor, this mixing device preferably being of the kind described in Swedish Patent Application 9303019-5.
  • the normal level of pulp in operation is marked at the upper end of the reactor 103.
  • a pulp outlet is included at the lower end of the reactor 103, and a conventional bottom scraper is provided internally of the reactor. All of the pulp or part of the pulp may optionally be returned to the top of the reactor, through a conduit which extends from the reactor outlet to the upper part of said reactor (not shown) .
  • the normal pulp level is shown at 105, 205 in the Figures.
  • a further stand pipe 107 Located downstream of the reactor 103 is a further stand pipe 107, which is provided with a flu stack or chimney 108 for degasification of the pulp.
  • a valve which coacts with a liquid indication device LIC, so as to be able to control the level of pulp in the reactor 103 so that pulp will not be conveyed from the reactor to the stand pipe 107 for degasification in unduly excessive quantities and thereby change the reaction conditions in the reactor in an undesirable manner.
  • the arrangement illustrated in Fig. 2 includes the components described above with reference to Fig. 1, and further includes a head box 109 provided with an inlet for unbleached pulp, and a pre-reactor 206 which is filled hydraulically.
  • the purpose of the pre-reactor is partly to increase the effective time for the chemicals already supplied to the stand pipe 201 prior to adding optional substances in the reactor 203, and partly to enable the desired reaction conditions in the reactor 203 to be achieved by appropriate dimensioning of the pre-reactor 206.
  • the hydraulically filled pre-reactor 206 can also act as a buffer in achieving a uniform pulp flow to the reactor. The pre-reactor 206 is thus able to assist in adjusting reaction conditions in the reactor to an optimum.
  • the arrangement illustrated in Fig. 2 also includes the possibility of delivering steam to the head box 209, this supply being controlled through the medium of a temperature sensing device TIC mounted in the feed conduit extending from the stand pipe 201 to the pre-reactor 206, this temperature sensing device coacting with a valve 212 for delivering steam to the head box 209.
  • a valve for delivering pulp from the stand pipe 201 to the pre-reactor 206 is provided downstream of an MC pump 202 in the same feed conduit.
  • the preferred device for spreading pulp at the upper end of the reactor in accordance with the aforegoing is a device primarily intended for storage towers, buffer tanks or reactors.
  • the device is intended to be mounted centrally at the top of the container.
  • the device is constructed to distribute or spread the pulp uniformly over the whole of the cross-sectional area of the container, which may be a tower, a tank or a reactor. This uniform spreading of the pulp over the cross-sectional area of the container results in a uniform outfeed speed (plug flow) , thereby eliminating the risk of channelization and enabling the reactor residence time to be used effectively.
  • Figs. 3 and 4 illustrate respectively two embodiments of the pulp-spreading device mounted at an upper part of a container 301, 401 for storing or for preparing paper pulp.
  • Pulp is delivered to the container 301, 401, which in this case is a reactor, through a conduit 302, 402 which discharges through an upwardly directed inlet 303, 403 (spillway) at the top of the container.
  • a spreader impeller 304, 404 is rotatably mounted on a drive shaft 305, 405, which in the case of the illustrated embodiment is journalled in the upper part of the respective container 301, 401 and driven by a motor 307 or by a frequency controlled motor 407, via a transmission 306 or a coupling 406.
  • Frequency control of the motor is significant to the mode of operation of the pulp- spreading device.
  • a conduit 409 which discharges into a nozzle 410, which is mounted so that the nozzle will open into the conduit 402 and is preferably directed towards the inlet 403.
  • the impeller 404 can be used to distribute a supplementary substance delivered to the pulp present in the container, such as a chemical substance or some liquid substance.
  • the substance may be distributed either directly over the pulp in the container or together with pulp as the pulp is distributed in the container.
  • Conceivable chemicals that can be charged through the conduit 409 are anti-foaming agents, such as EDTA (chelating agent) , bleaching agents such as peroxide (e.g. H 2 0 2 ) or pH adjusters such as NaOH or H 2 S0 4 , etc.
  • the nozzle may also be rotatable or several pipes provided with nozzles or jets may be disposed along the conduit 402 to enable earlier mixing of the supplementary charge in the pulp.
  • Another alternative is to connect the conduit 409 directly to the hub of the impeller from beneath, so that the supplementary charge will be delivered directly via openings (not shown) provided in the impeller.
  • Respective impellers 304 and 404 are described below in more detail with reference to Fig. 5.
  • the impeller includes a hub 1 which is fixedly mounted on respective drive shafts 305 or 405, preferably by means of a wedge joint shown at 2.
  • First spreader blades or vanes 10 which preferably have a surface 11 which is curved towards the direction of rotation, are mounted on the drive shaft at an angle ⁇ to the tangent of the outer surface of the hub, so that the pulp will be spread outwardly towards the periphery of the container.
  • Second spreader blades or vanes 12, which also preferably have a surface 13 that curves towards the direction of rotation, are mounted on the drive shaft at preferably the same angle ⁇ .
  • the angle ⁇ is preferably chosen to achieve suitable spreading or distribu ⁇ tion of the pulp radially outwards in accordance with the configuration of the surfaces 11 and 13, which are preferably curved but which may alternatively have some other configura- tion, for instance a planar configuration.
  • the first and the second blades 10 and 12 are mounted on the hub in pairs, such that the second blade 12, which - to avoid the build-up of fibres - may be shorter than the first blade 10, is prefera ⁇ bly placed before the first spreader blade 10 as seen in the direction of rotation. Although two pairs of hub-mounted spreader blades are shown in the Figure, it will be under ⁇ stood that the number of blades may be varied within the scope of the invention.
  • Each blade 10, 12 thus has a respective surface 11, 13 which faces towards the direction of rotation and which is config ⁇ ured and mounted relative to the hub in a manner to spread the pulp outwards towards the periphery of the container as respective impellers 304, 404 rotate.
  • the respective surfaces 11, 13 have a radius of curvature which lies between 100-300 mm, and preferably between 150-200 mm.
  • the pulp-spreading device includes a baffle 14 whose one end 15 may be connected to the outer end 16 of a respective first blade 10.
  • Each baffle extends arcuately in the direction of rotation and has its centre of arc in the centre of the hub 1, such that the other end 17 of the baffle 14 will preferably extend beyond the outer end 18 of a respective second blade 12.
  • Part of the pulp that is thrown outwardly by the second blade 12 will thus be deflected by the baffle 14 and therewith spread and distributed towards the centre of the container, so as to distribute pulp over the whole of the cross-sectional area of the container.
  • a generally radially extending reinforcement plate 19 connects the baffle 14 to the outer end 18 of the second blade 12. This reinforcement plate is thus placed generally centrally of the upper and lower edges of the blades on the side of the second blade 12 facing towards the direction of rotation, so as to provide more stability to the blades 10 and 12 and to the baffle 14 in operation.
  • the inlet 303/403 opens out immediately beneath the impeller 304/404, whereby the pulp exiting from the inlet is sliced and thrown-out and spread uniformly over the cross-sectional area of the container.
  • the speed at which the impeller rotates and the vertical distance between impeller and the outlet orifice of the pulp tube are adapted to ensure uniform pulp distribution.
  • the component parts of the impeller are preferably made of metal and welded together.
  • the outer diameter of the impeller 304/404 is about 100 mm larger than the diameter of the outlet orifice of the pulp inlet 303/403.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)

Abstract

L'invention concerne un procédé de blanchiment de la pulpe, de préférence dans une étape comportant l'utilisation de peroxyde sous pression, procédé dans lequel on introduit les additifs nécessaires au blanchiment dans la pulpe, celle-ci étant introduite dans l'extrémité supérieure d'un réacteur de type généralement vertical, au travers duquel on la laisse descendre. Dans l'étape de blanchiment, on obtient une pression souhaitée en introduisant de la vapeur, de préférence une vapeur à faible pression, dans l'extrémité supérieure du réacteur, et on laisse descendre la pulpe dans celui-ci, sous l'effet du propre poids de celle-ci, produisant ainsi une augmentation essentiellement continue de pression dans la pulpe, de l'extrémité supérieure du réacteur à l'extrémité inférieure de celui-ci. L'invention concerne également un dispositif destiné à la réalisation dudit procédé de blanchiment de la pulpe, de préférence dans une étape comportant l'utilisation de peroxyde sous pression. Ce dispositif comprend un tuyau vertical (101, 201) ou un élément analogue servant à fournir la pulpe pour l'étape de blanchiment ainsi qu'à introduire dans la pulpe des substances de blanchiment; un réacteur (103, 203) de type essentiellement vertical destiné au processus de blanchiment à l'aide de peroxyde sous pression, ainsi qu'un autre tuyau vertical (107, 207) servant au dégazage de la pulpe après ladite étape.
PCT/SE1994/001111 1994-07-20 1994-11-21 Procede et dispositif se rapportant au blanchiment a l'aide de peroxyde sous pression WO1996002699A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU13934/95A AU1393495A (en) 1994-07-20 1994-11-21 A method and an arrangement relating to bleaching with pressurized peroxide

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9402542-6 1994-07-20
SE9402542A SE9402542D0 (sv) 1994-07-20 1994-07-20 Förfarande och anordning vid blekning med trycksatt peroxid

Publications (1)

Publication Number Publication Date
WO1996002699A1 true WO1996002699A1 (fr) 1996-02-01

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ID=20394779

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1994/001111 WO1996002699A1 (fr) 1994-07-20 1994-11-21 Procede et dispositif se rapportant au blanchiment a l'aide de peroxyde sous pression

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Country Link
AU (1) AU1393495A (fr)
SE (1) SE9402542D0 (fr)
WO (1) WO1996002699A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1049222B (de) * 1954-11-19 1959-01-22 Fmc Corp Verfahren zum Bleichen von Papierstoff aus Holz
DE2100703A1 (de) * 1970-01-08 1971-07-15 Canadian Industries Ltd , Montreal, Quebec (Kanada) Verfahren und Vorrichtung zum Bleichen von Lignocellulosematerial
EP0577157A2 (fr) * 1991-06-27 1994-01-05 A. Ahlstrom Corporation Procédé de blanchiment au peroxyde
WO1994001615A1 (fr) * 1992-07-09 1994-01-20 Kvaerner Pulping Technologies Ab Procede de blanchiment de pulpe combine a l'adsorption de metaux
WO1994010378A1 (fr) * 1992-10-26 1994-05-11 Sca-Wifsta-Östrand Ab Procede de blanchiment de pate alcaline au sulfate
SE500954C2 (sv) * 1993-10-01 1994-10-10 Kvaerner Pulping Tech Klorfri blekning av kemisk pappersmassa

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1049222B (de) * 1954-11-19 1959-01-22 Fmc Corp Verfahren zum Bleichen von Papierstoff aus Holz
DE2100703A1 (de) * 1970-01-08 1971-07-15 Canadian Industries Ltd , Montreal, Quebec (Kanada) Verfahren und Vorrichtung zum Bleichen von Lignocellulosematerial
EP0577157A2 (fr) * 1991-06-27 1994-01-05 A. Ahlstrom Corporation Procédé de blanchiment au peroxyde
WO1994001615A1 (fr) * 1992-07-09 1994-01-20 Kvaerner Pulping Technologies Ab Procede de blanchiment de pulpe combine a l'adsorption de metaux
WO1994010378A1 (fr) * 1992-10-26 1994-05-11 Sca-Wifsta-Östrand Ab Procede de blanchiment de pate alcaline au sulfate
SE500954C2 (sv) * 1993-10-01 1994-10-10 Kvaerner Pulping Tech Klorfri blekning av kemisk pappersmassa

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
SVENSK PAPPERSTIDNING, Volume 15, 1977, CARL-JOHAN ALFTHAN et al., "High-Temperature Peroxide Bleaching of Sulphate Pulp", pages 480-482. *

Also Published As

Publication number Publication date
AU1393495A (en) 1996-02-16
SE9402542D0 (sv) 1994-07-20

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