EP0276608A1 - Process for treating a paper slurry with ozone - Google Patents

Process for treating a paper slurry with ozone Download PDF

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Publication number
EP0276608A1
EP0276608A1 EP87402949A EP87402949A EP0276608A1 EP 0276608 A1 EP0276608 A1 EP 0276608A1 EP 87402949 A EP87402949 A EP 87402949A EP 87402949 A EP87402949 A EP 87402949A EP 0276608 A1 EP0276608 A1 EP 0276608A1
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Prior art keywords
ozone
pulp
dough
reactor
treatment
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EP87402949A
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German (de)
French (fr)
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EP0276608B1 (en
Inventor
Jean Paul Delaroche
Jean Claude Cleuet
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Beghin Say SA
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Beghin Say SA
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B11/00—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
    • B30B11/22—Extrusion presses; Dies therefor
    • B30B11/24—Extrusion presses; Dies therefor using screws or worms
    • B30B11/246—Screw constructions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B11/00—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
    • B30B11/22—Extrusion presses; Dies therefor
    • B30B11/24—Extrusion presses; Dies therefor using screws or worms
    • B30B11/243—Extrusion presses; Dies therefor using screws or worms using two or more screws working in the same chamber
    • 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
    • D21B1/14—Disintegrating in mills
    • D21B1/16—Disintegrating in mills in the presence of chemical agents
    • 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
    • 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
    • D21C9/147—Bleaching ; Apparatus therefor with oxygen or its allotropic modifications
    • D21C9/153—Bleaching ; Apparatus therefor with oxygen or its allotropic modifications with ozone

Abstract

Method for treating with ozone a high yield finished pulp, that is to say a previously refined and purified pulp up to a refining degree required for its final utilization. The treatment is carried out in a reactor (1) consisting of a dual-screw machine, known per se, comprising inside a sleeve (7), two screws (3, 5) with parallel axes which are intermeshed and driven in the same rotational direction, and of which the helical threads present successive zones (10, 20, 30, 40) with different pitches. The pulp is introduced into the reactor at a high dryness level, preferably between 40 and 45 %. The ozone ratio may be from 2 % to 8 %. It is possible to continuously and simply obtain by implementing this method a high yield pulp having improved mechanical resistance properties.

Description

L'invention se rapporte à un procédé pour le traitement à l'ozone, en continu, d'une pâte à haut rendement entrant dans la fabrication du papier.The invention relates to a process for the continuous ozone treatment of a high-yield pulp used in the manufacture of paper.

Pour fabriquer du papier, on utilise jusqu'à présent un mélange de pâtes d'origines diverses, on mélange en particulier une pâte chimique à une pâte mécanique. Les pâtes mécaniques, notamment par leur opacité, offrent de bonnes caractéristiques d'impression mais présentent des propriétés de résistance mécanique insuffisantes pour le passage en machine. Ces dernières sont apportées au mélange par la pâte chimique. Toutefois, les pâtes chimiques sont d'un prix de revient nettement plus élevé que les premières. On a donc cherché à éviter, ou du moins à limiter leur emploi en renforçant les propriétés de résistance de la pâte mécanique par un post-traitement chimique.To make paper, a mixture of pulps of various origins has hitherto been used, in particular a chemical pulp is mixed with a mechanical pulp. Mechanical pastes, in particular by their opacity, offer good printing characteristics but have insufficient mechanical resistance properties for passage through the machine. The latter are brought to the mixture by chemical pulp. However, chemical pulps are considerably more costly than the former. We have therefore sought to avoid, or at least limit their use by strengthening the strength properties of mechanical pulp by chemical post-treatment.

Un traitement connu consiste à faire réagir la pâte avec un gaz conte­nant de l'ozone car ce dernier permet une meilleure liaison des fibres en modifiant leur état de surface et la lignine.A known treatment consists in reacting the pulp with a gas containing ozone because the latter allows better bonding of the fibers by modifying their surface state and the lignin.

Malheureusement, les procédés actuels n'ont pas apporté de solution satisfaisante, car si les résultats obtenus en laboratoire sont inté­ressants, il n'a pas été possible jusqu'à présent de les reproduire à l'échelle industrielle. Il semble que les difficultés rencontrées se situent tant au niveau du réacteur que des équipements d'ozonation.Unfortunately, the current methods have not provided a satisfactory solution, because if the results obtained in the laboratory are interesting, it has not so far been possible to reproduce them on an industrial scale. It seems that the difficulties encountered lie both in the reactor and in the ozonation equipment.

L'invention a pour objet un procédé industriel permettant d'obtenir une pâte présentant les qualités requises pour la fabrication de papier, à partir d'une pâte du type mécanique, tout en maintenant le rendement à un niveau satisfaisant.The subject of the invention is an industrial process making it possible to obtain a pulp having the qualities required for the manufacture of paper, from a pulp of the mechanical type, while maintaining the yield at a satisfactory level.

Le procédé est caractérisé en ce qu'il consiste à raffiner et à épurer la pâte jusqu'à un degré de raffinage requis pour son utilisation, puis à traiter cette pâte, finie, à l'ozone dans un réacteur constitué par une machine du type bi-vis.The method is characterized in that it consists in refining and purifying the dough to a degree of refinement required for its use, then in treating this dough, finished, with ozone in a reactor constituted by a machine of the type twin screw.

Dans la pratique, par le raffinage et l'épuration classiques, la pâte est amenée à un degré d'égouttage de 60 à 130 csf (Canadian Standard Freeness).In practice, by conventional refining and purification, the dough is brought to a degree of drainage of 60 to 130 csf (Canadian Standard Freeness).

Par machine du type bi-vis, on entend dans la demande, une machine correspondant à l'enseignement des brevets - FR 2 319 737 et FR 2 418 295, c'est-à-dire comprenant deux vis à axes parallèles entraînées dans un même sens de rotation à l'intérieur d'un fourreau, et dont les filetages hélicoïdaux comportent des zones successives à pas différents.By machine of the twin-screw type is meant in the application, a machine corresponding to the teaching of patents - FR 2 319 737 and FR 2 418 295, that is to say comprising two screws with parallel axes driven in a same direction of rotation inside a sleeve, and whose helical threads have successive zones with different pitch.

Les vis comprennent, en aval d'un orifice d'introduction de la matière dans le fourreau, successivement au moins une zone d'alimentation à pas direct pour l'entraînement de la matière vers l'aval, une première zone dont le filetage est à pas inversé pour la formation d'un bouchon con­tinu avec compression de la matière, une zone à pas direct de détente et une deuxième zone à pas inversé. Les zones dont le filetage est à pas inversé comportent des fenêtres permettant l'extrusion de la matière. Elles sont toutefois dimensionnées de façon à favoriser la formation d'un bouchon. Entre ces deux zones à pas inversé, le fourreau est pourvu d'un orifice d'alimentation d'un agent réactif.The screws comprise, downstream of an orifice for introducing the material into the sheath, successively at least one feed zone with direct pitch for driving the material downstream, a first zone whose thread is with inverted pitch for the formation of a continuous plug with compression of the material, an area with direct expansion step and a second area with inverted step. The zones whose threads are not reversed have windows allowing the extrusion of the material. They are however dimensioned so as to favor the formation of a plug. Between these two reverse-pitch zones, the sheath is provided with a port for supplying a reactive agent.

Il est apparu de façon surprenante que l'utilisation d'une machine de ce type comme réacteur pour le traitement à l'ozone d'une pâte à haut ren­dement, finie, permettait d'obtenir en continu, de façon simple et avec un haut niveau de sécurité, une pâte aux qualités mécaniques améliorées. Pour ce traitement, le gaz contenant l'ozone est introduit dans la zone délimitée par les deux bouchons, par l'orifice d'alimentation de l'agent réactif.It has surprisingly appeared that the use of a machine of this type as a reactor for the ozone treatment of a high yield, finished pulp makes it possible to obtain continuously, in a simple manner and with a high security level, a paste with improved mechanical qualities. For this treatment, the ozone-containing gas is introduced into the zone delimited by the two plugs, through the supply port of the reactive agent.

Selon les conditions opératoires, on a pu ainsi obtenir un gain sur l'indice de longueur de rupture de l'ordre de 40% et de 50% sur celui d'éclatement, l'indice de déchirure étant maintenu à sa valeur.
Alors que dans les procédés antérieurs, faisant intervenir un traitement à l'ozone sur une pâte grossière ou peu raffinée, on constatait que le raffinage final ramenait celle-ci à un état similaire à celui d'une pâte raffinée sans traitement à l'ozone, le procédé de l'invention, où le traitement est effectué sur une pâte finie, non seulement conserve les propriétés de cette dernière mais en améliore certaines dont la longueur de rupture et l'éclatement.According to the operating conditions, it was thus possible to obtain a gain on the index of rupture length of the order of 40% and 50% on that of bursting, the index of tearing being maintained at its value.
Whereas in the previous processes, involving an ozone treatment on a coarse or unrefined dough, it was found that the final refining brought the latter to a state similar to that of a refined dough without treatment with ozone , the method of the invention, where the treatment is carried out on a finished dough, not only retains the properties of the latter but improves some of them including the length of breakage and bursting.

Conformément à un autre aspect de l'invention, la pâte introduite dans le réacteur est à un degré de siccité élevé, compris entre 20 et 50%, de préférence compris entre 40 et 45%. On constate, en effet, que dans le cas d'une pâte à haute siccité, son expansion rapide après une compres­sion suivie d'un malaxage, est très favorable à l'action de l'ozone sur les fibres, celle-ci est pratiquement instantanée. Par ce type de mode opératoire, l'accessibilité aux fibres par l'ozone est bien meilleure que ce qu'on pourrait obtenir dans un réacteur statique industriel.According to another aspect of the invention, the pulp introduced into the reactor is at a high degree of dryness, between 20 and 50%, preferably between 40 and 45%. It is found, in fact, that in the case of a dough with high dryness, its rapid expansion after compression followed by kneading, is very favorable to the action of ozone on the fibers, it is practically instant. By this type of procedure, accessibility to fibers by ozone is much better than what could be obtained in an industrial static reactor.

La description qui suit porte sur un mode de réalisation non limitatif de l'invention. Elle est accompagnée de dessins qui représentent schéma­tiquement,

  • - A la figure 1 une vue en coupe longitudinale d'une machine bi-vis dont le principe est en soi connu, et qui permet la mise en oeuvre du procédé et de l'invention.
  • - A la figure 2 une vue en coupe transversale selon II II de la figure 1.
The description which follows relates to a nonlimiting embodiment of the invention. It is accompanied by drawings which schematically represent,
  • - In Figure 1 a longitudinal sectional view of a twin-screw machine whose principle is known per se, and which allows the implementation of the method and the invention.
  • - In Figure 2 a cross-sectional view along II II of Figure 1.

La machine 1 vue en coupe longitudinale par l'axe d'une vis comporte deux vis à axes parallèles 3, 5 s'engrenant l'une dans l'autre et entraînées par des moyens appropriés dans un même sens de rotation. Ces deux vis sont supportées à leurs extrêmités longitudinales par des paliers non représentés, elles sont enfermées dans un fourreau 7 qui comporte un orifice d'alimentation 71 en amont et un orifice d'extrac­tion 73 de la matière traitée, en aval.The machine 1 seen in longitudinal section through the axis of a screw comprises two screws with parallel axes 3, 5 which mesh with one another and are driven by suitable means in the same direction of rotation. These two screws are supported at their longitudinal ends by bearings not shown, they are enclosed in a sheath 7 which has a supply orifice 71 upstream and an extraction orifice 73 for the treated material, downstream.

Dans le mode de réalisation représenté, les vis, qui sont pourvues de filets identiques, définissent de l'amont vers l'aval, quatres zones 10, 20, 30, 40, et comportent deux parties à pas différents dans chacune des zones. Dans la première partie, 12, 22, 32, 42 les filets hélicoïdaux sont écartés et permettent l'avancement de la pâte de l'amont vers l'aval. Dans la deuxième partie 14, 24, 34, 44 les filets hélicoïdaux sont à pas inversé et provoquent un freinage de la pâte qui est compri­mée et s'accumule jusqu'à former un bouchon.In the embodiment shown, the screws, which are provided with identical threads, define from upstream to downstream, four zones 10, 20, 30, 40, and comprise two parts with different pitch in each of the zones. In the first part, 12, 22, 32, 42 the helical threads are separated and allow the advancement of the dough from upstream to downstream. In the second part 14, 24, 34, 44 the helical threads are not reversed and cause a braking of the dough which is compressed and accumulates until forming a plug.

Des fenêtres 15, 25, 35, 45 ménagées sur les filets à pas inversé per­mettent un passage de la matière d'un filet à l'autre jusque dans la zone suivante 20, 30, 40, ou bien vers l'orifice d'évacuation pour la partie 44. Deux bagues 13 et 43, non filetées sont disposées respecti­vement entre les parties 12 et 14 de la première zone, et les parties 42 et 44 de la quatrième zone. Elles ont pour objet de faciliter l'accumu­lation de matière en ces endroits.Windows 15, 25, 35, 45 formed on the threads with reverse pitch allow the material to pass from one thread to the other as far as the next zone 20, 30, 40, or towards the evacuation orifice for the part 44. Two rings 13 and 43, non-threaded are disposed respectively between the parts 12 and 14 of the first zone, and the parts 42 and 44 of the fourth zone. Their purpose is to facilitate the accumulation of matter in these places.

Entre l'orifice d'alimentation 71, au niveau de la première zone, et la sortie 73 après la quatrième zone, le fourreau comporte des orifices 75, 77 permettant l'injection d'un agent de traitement au niveau des parties 22 et 32 des deuxième et troisième zones. Un orifice 79 au niveau de la partie 42 de la quatrième zone permet l'extraction de l'agent de traitement résiduel.Between the supply orifice 71, at the level of the first zone, and the outlet 73 after the fourth zone, the sheath has orifices 75, 77 allowing the injection of a treatment agent at the level of the parts 22 and 32 second and third zones. An orifice 79 at the level of the part 42 of the fourth zone allows the extraction of the residual treatment agent.

Cette machine est du type décrit dans les brevets FR 2 319 737 et FR 2 418 295 et peut être employée au défibrage de pâtes ou bien pour leur faire subir divers traitements, comme cela est expliqué dans ces brevets.This machine is of the type described in the patents FR 2 319 737 and FR 2 418 295 and can be used for defibering pasta or else for subjecting them to various treatments, as explained in these patents.

Conformément à l'invention, on utilise ce dispositif pour réaliser un traitement à l'ozone, en continu, d'une pâte à haut rendement préalablement raffinée, c'est-à-dire dont le degré de raffinage correspond à celui souhaité pour l'application envisagée de la pâte.In accordance with the invention, this device is used to carry out a continuous ozone treatment of a previously refined high-yield paste, that is to say the degree of refining of which corresponds to that desired for the application of the paste.

Le raffinage préalable de la pâte à haut rendement peut être obtenu de toute façon connue en soi, en une ou deux étapes, par exemple par passage entre deux disques de raffinage.The prior refining of the high-yield dough can be obtained in any manner known per se, in one or two stages, for example by passing between two refining discs.

Pour une pâte destinée à la fabrication de papier, la pâte est raffinée jusqu'à un degré d'égouttage compris entre 60 et 130 csf (Canadian Standard Freeness).For a pulp intended for papermaking, the pulp is refined to a degree of drainage of between 60 and 130 csf (Canadian Standard Freeness).

Après raffinage, on épaissit la pâte, le cas échéant, pour amener son taux de siccité à une valeur comprise entre 20 et 50%, de préférence autour de 40%, et on l'introduit dans la machine par l'orifice d'alimentation 71. Elle est entraînée entre les filets des deux vis jusqu'à la partie à pas inversé 14, où elle est freinée et comprimée. Elle forme un bouchon étanche dont l'épaisseur est déterminée en partie par la bague 13. La pâte est extrudée progressivement à travers les fenêtres 15 des filets 14 et se détend en parvenant dans la deuxième zone 20 où elle est mise à réagir avec le gaz chargé d'ozone qui est injecté en 75. L'ouverture des fibres produite par la détente, favorise leur attaque par l'ozone de façon quasi-instantanée.After refining, the dough is thickened, if necessary, to bring its dryness rate to a value between 20 and 50%, preferably around 40%, and it is introduced into the machine through the feed orifice. 71. It is driven between the threads of the two screws up to the reverse-pitch part 14, where it is braked and compressed. It forms a tight plug whose thickness is determined in part by the ring 13. The dough is gradually extruded through the windows 15 of the threads 14 and relaxes when it reaches the second zone 20 where it is reacted with the gas. charge of ozone which is injected in 75. The opening of the fibers produced by the trigger promotes their attack by ozone almost instantaneously.

L'action de ce dernier se parfait pendant le transport et le malaxage de la matière sur toutes les parties 22, 32, 42, les parties 24 et 34 contribuant efficacement au mélange. Les bouchons formés aussi bien en amont qu'en aval de ces trois zones par les filets inversés 14 et 44, et les bagues 13 et 43 assurent la constitution d'une enceinte fermée, étanche aux gaz.The action of the latter is perfect during the transport and the mixing of the material on all the parts 22, 32, 42, the parts 24 and 34 contributing effectively to the mixture. The plugs formed both upstream and downstream of these three zones by the inverted threads 14 and 44, and the rings 13 and 43 ensure the constitution of a closed enclosure, gas tight.

Une injection d'ozone supplémentaire peut être effectuée dans la troi­sième zone, au niveau de la partie 32 suivant la détente de la matière à la sortie des fenêtres d'extrusion 25 de la partie 24. Après son trai­tement, la pâte est évacuée axialement par l'orifice 73 en aval du bouchon terminal de la quatrième zone.An additional ozone injection can be carried out in the third zone, at the level of the part 32 following the relaxation of the material at the exit of the extrusion windows 25 of the part 24. After its treatment, the dough is discharged axially by the orifice 73 downstream of the terminal plug of the fourth zone.

A cette quatrième zone peut être associé en 79 un moyen de balayage pour éliminer l'ozone résiduel.This fourth zone can be associated in 79 with a sweeping means to remove the residual ozone.

On a appliqué le traitement à une pâte chimicothermomécanique, finie, acidifiée et épaissie, en introduisant l'ozone sous forme de mélange ozone-air ou ozone-oxygène à des taux compris entre 2% et 8%, évalués en poids de pâte.
Le tableau ci-dessous récapitule les résultats obtenus :

Figure imgb0001
On a appliqué le traitement à une pâte présentant des caractéristiques initiales différentes.
Figure imgb0002
 The treatment was applied to a chemothermomechanical paste, finished, acidified and thickened, by introducing ozone in the form of an ozone-air or ozone-oxygen mixture at rates of between 2% and 8%, evaluated by weight of paste.
The table below summarizes the results obtained:
Figure imgb0001
 The treatment was applied to a paste having different initial characteristics.
Figure imgb0002

Claims (8)

1/ Procédé pour le traitement à l'ozone d'une pâte de fibres cellu­losiques à haut rendement caractérisé en ce qu'il consiste à raffiner et à épurer la pâte jusqu'à un degré de raffinage requis pour son utilisation finale puis à la traiter à l'ozone dans un réacteur constitué par une machine bi-vis.1 / Process for the ozone treatment of a pulp of high-yield cellulosic fibers, characterized in that it consists in refining and purifying the pulp to a degree of refinement required for its final use, then in treating it with ozone in a reactor consisting of a twin-screw machine. 2/ Procédé selon la revendication 1 caractérisé en ce que la pâte est introduite dans le réacteur à une siccité comprise entre 20% et 50%.2 / A method according to claim 1 characterized in that the paste is introduced into the reactor at a dryness of between 20% and 50%. 3/ Procédé selon la revendication 2 caractérisé en ce que la pâte est à une siccité comprise entre 40 et 45%.3 / A method according to claim 2 characterized in that the dough is at a dryness between 40 and 45%. 4/ Procédé selon l'une des revendications 2 et 3 caractérisé en ce que la pâte est préalablement acidifiée avant son épaississage.4 / Method according to one of claims 2 and 3 characterized in that the dough is previously acidified before thickening. 5/ Procédé selon l'une des revendications précédentes caractérisé en ce que la pâte est raffinée jusqu'à un degré de raffinage compris entre 60 et 130 csf.5 / Method according to one of the preceding claims characterized in that the dough is refined to a degree of refinement between 60 and 130 csf. 6/ Procédé selon l'une des revendications précédentes caractérisé en ce que la pâte raffinée est introduite dans une machine bi-vis compor­tant au moins une première partie de transport une première partie de compression suivie d'une deuxième partie de transport et d'une deuxième partie de compression, l'ozone, de préférence sous forme de mélange ozone-oxygène ou ozone-air étant mis à réagir avec ladite pâte cellulosique dans aux moins une zone de la machine comprise entre lesdites parties de compression.6 / Method according to one of the preceding claims characterized in that the refined dough is introduced into a twin-screw machine comprising at least a first transport part a first compression part followed by a second transport part and a second compression part, the ozone, preferably in the form of an ozone-oxygen or ozone-air mixture being reacted with said cellulosic paste in at least one zone of the machine comprised between said compression parts. 7/ Procédé selon l'une des revendications précédentes caractérisé en ce que l'ozone est mis à réagir en quantité égale à au moins 2% de la masse de pâte traitée.7 / A method according to one of the preceding claims characterized in that the ozone is reacted in an amount equal to at least 2% of the mass of pulp treated. 8/ Procédé selon la revendication 7 caractérisé en ce que le taux d'ozone est compris entre 2 et 8%.8 / A method according to claim 7 characterized in that the ozone level is between 2 and 8%.
EP87402949A 1986-12-31 1987-12-22 Process for treating a paper slurry with ozone Expired - Lifetime EP0276608B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8618447A FR2609067B1 (en) 1986-12-31 1986-12-31 PROCESS FOR THE OZONE TREATMENT OF A CELLULOSIC PASTE
FR8618447 1986-12-31

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EP0276608A1 true EP0276608A1 (en) 1988-08-03
EP0276608B1 EP0276608B1 (en) 1991-03-27

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EP (1) EP0276608B1 (en)
JP (1) JP2547246B2 (en)
CA (1) CA1326942C (en)
DE (1) DE3768936D1 (en)
ES (1) ES2021083B3 (en)
FR (1) FR2609067B1 (en)
NO (1) NO883795L (en)
PT (1) PT86482B (en)
WO (1) WO1988005095A1 (en)

Cited By (8)

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Publication number Priority date Publication date Assignee Title
EP0308314A1 (en) * 1987-09-17 1989-03-22 "DEGREMONT" Société dite: Process for the ozone treatment of lignocellulosic materials, in particular paper pulps, and reactor for carrying out this process
US5174861A (en) * 1990-10-26 1992-12-29 Union Camp Patent Holdings, Inc. Method of bleaching high consistency pulp with ozone
US5181989A (en) * 1990-10-26 1993-01-26 Union Camp Patent Holdings, Inc. Reactor for bleaching high consistency pulp with ozone
US5211811A (en) * 1989-02-15 1993-05-18 Union Camp Patent Holding, Inc. Process for high consistency oxygen delignification of alkaline treated pulp followed by ozone delignification
US5409570A (en) * 1989-02-15 1995-04-25 Union Camp Patent Holding, Inc. Process for ozone bleaching of oxygen delignified pulp while conveying the pulp through a reaction zone
US5451296A (en) * 1991-05-24 1995-09-19 Union Camp Patent Holding, Inc. Two stage pulp bleaching reactor
US5472572A (en) * 1990-10-26 1995-12-05 Union Camp Patent Holding, Inc. Reactor for bleaching high consistency pulp with ozone
US5520783A (en) * 1990-10-26 1996-05-28 Union Camp Patent Holding, Inc. Apparatus for bleaching high consistency pulp with ozone

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Publication number Priority date Publication date Assignee Title
US5030465A (en) * 1990-10-16 1991-07-09 Besst Frozen Products, Inc. Apparatus and method for making frozen confections
US5229150A (en) * 1990-10-16 1993-07-20 Besst Frozen Products, Inc. Food processing apparatus and method
US5151288A (en) * 1990-10-16 1992-09-29 Besst Frozen Products, Inc. Food processing apparatus and method
FR2937656B1 (en) * 2008-10-24 2010-11-19 Arkema France PROCESS FOR PRODUCING PAPER PULP

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DE2444475A1 (en) * 1973-10-04 1975-04-17 Papirind Forskningsinst Ozonising paper stock without fluffing - in a gas reactor immediately following disintegration in rotary grinders at consistencies of 25 to 40 percent
FR2406023A1 (en) * 1977-10-17 1979-05-11 Myrens Verksted As PROCESS FOR TREATMENT OF REFINED MECHANICAL PULP AND THERMOMECHANICAL PULP BY OZONE
FR2436844A2 (en) * 1978-09-19 1980-04-18 Creusot Loire Converting lignocellulose material into fibre pulp - for paper-making, by introducing bleach whilst the lignocellulose is being broken down
DE3422087A1 (en) * 1983-06-25 1985-01-03 Hermann Berstorff Maschinenbau Gmbh, 3000 Hannover Apparatus for the production of wood pulp

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DE2444475A1 (en) * 1973-10-04 1975-04-17 Papirind Forskningsinst Ozonising paper stock without fluffing - in a gas reactor immediately following disintegration in rotary grinders at consistencies of 25 to 40 percent
FR2406023A1 (en) * 1977-10-17 1979-05-11 Myrens Verksted As PROCESS FOR TREATMENT OF REFINED MECHANICAL PULP AND THERMOMECHANICAL PULP BY OZONE
FR2436844A2 (en) * 1978-09-19 1980-04-18 Creusot Loire Converting lignocellulose material into fibre pulp - for paper-making, by introducing bleach whilst the lignocellulose is being broken down
DE3422087A1 (en) * 1983-06-25 1985-01-03 Hermann Berstorff Maschinenbau Gmbh, 3000 Hannover Apparatus for the production of wood pulp

Cited By (9)

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Publication number Priority date Publication date Assignee Title
EP0308314A1 (en) * 1987-09-17 1989-03-22 "DEGREMONT" Société dite: Process for the ozone treatment of lignocellulosic materials, in particular paper pulps, and reactor for carrying out this process
US5211811A (en) * 1989-02-15 1993-05-18 Union Camp Patent Holding, Inc. Process for high consistency oxygen delignification of alkaline treated pulp followed by ozone delignification
US5409570A (en) * 1989-02-15 1995-04-25 Union Camp Patent Holding, Inc. Process for ozone bleaching of oxygen delignified pulp while conveying the pulp through a reaction zone
US5174861A (en) * 1990-10-26 1992-12-29 Union Camp Patent Holdings, Inc. Method of bleaching high consistency pulp with ozone
US5181989A (en) * 1990-10-26 1993-01-26 Union Camp Patent Holdings, Inc. Reactor for bleaching high consistency pulp with ozone
US5472572A (en) * 1990-10-26 1995-12-05 Union Camp Patent Holding, Inc. Reactor for bleaching high consistency pulp with ozone
US5520783A (en) * 1990-10-26 1996-05-28 Union Camp Patent Holding, Inc. Apparatus for bleaching high consistency pulp with ozone
US5863389A (en) * 1990-10-26 1999-01-26 Union Camp Patent Holding, Inc. Pulp bleaching reactor for dispersing high consistency pulp into a gaseous bleaching agent containing ozone
US5451296A (en) * 1991-05-24 1995-09-19 Union Camp Patent Holding, Inc. Two stage pulp bleaching reactor

Also Published As

Publication number Publication date
PT86482A (en) 1988-01-01
PT86482B (en) 1990-11-20
NO883795D0 (en) 1988-08-25
FR2609067B1 (en) 1990-06-15
ES2021083B3 (en) 1991-10-16
CA1326942C (en) 1994-02-15
JPH01501805A (en) 1989-06-22
NO883795L (en) 1988-08-25
EP0276608B1 (en) 1991-03-27
WO1988005095A1 (en) 1988-07-14
FR2609067A1 (en) 1988-07-01
DE3768936D1 (en) 1991-05-02
JP2547246B2 (en) 1996-10-23

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