EP0433138B1 - Procédé de blanchiment de pâtes cellulosiques chimiques - Google Patents

Procédé de blanchiment de pâtes cellulosiques chimiques Download PDF

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Publication number
EP0433138B1
EP0433138B1 EP90403462A EP90403462A EP0433138B1 EP 0433138 B1 EP0433138 B1 EP 0433138B1 EP 90403462 A EP90403462 A EP 90403462A EP 90403462 A EP90403462 A EP 90403462A EP 0433138 B1 EP0433138 B1 EP 0433138B1
Authority
EP
European Patent Office
Prior art keywords
treatment
poa
sequence
alkaline
acid
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.)
Expired - Lifetime
Application number
EP90403462A
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German (de)
English (en)
French (fr)
Other versions
EP0433138A1 (fr
Inventor
Alain M. Siohan
Jean-Claude M. Doignie
Jean-Claude M. Pommier
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.)
TARTAS S.A.
Original Assignee
Cellulose du Pin SA
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Publication date
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Application filed by Cellulose du Pin SA filed Critical Cellulose du Pin SA
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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
    • D21C9/1057—Multistage, with compounds cited in more than one sub-group D21C9/10, D21C9/12, D21C9/16

Definitions

  • the invention relates to the bleaching of chemical cellulosic pulps, in particular bisulphite pulps in order to obtain bleached pulps, absorbents in particular fluff pulps, having the desired whiteness and hydrophilicity.
  • Industrial processes for bleaching chemical cellulosic pulps generally use different sequences corresponding to different successive treatments, and generally among these at least one treatment using chlorine or chlorine derivatives.
  • H2O2 hydrogen peroxides
  • NaoCl sodium hypochlorite
  • chlorinated products Cl2, ClO2, NaOCl
  • Cl2, ClO2, NaOCl chlorinated products
  • chlorinated organic compounds chlorine level: AOX. TOCl
  • Most of these products are generated at the chlorination stage. By the use of chlorine dioxide one can decrease their formation.
  • the invention as described in claim 1, provides a process for bleaching a chemical cellulose pulp, in particular a bisulphite pulp, which not only avoids the use of chlorinated products, but which, in addition, by l elimination of the resins makes it possible to obtain a hydrophilic paste, having the desired absorption properties.
  • bleaching process therefore means, according to the invention, a process which not only makes it possible to bleach the chemical pulp, but which also makes this pulp hydrophilic.
  • the method according to the invention comprises at least one treatment with a bleaching agent that does not contain chlorine, at least two alkaline treatments and at least one acid treatment of a duration at least equal to 15 minutes, interleaved between the two alkaline treatments .
  • alkaline treatment is meant according to the invention either a treatment with sodium hydroxide or equivalent, or a treatment in an alkaline medium, that is to say a treatment combining the action of sodium hydroxide, or equivalent, with another agent , especially oxygen or hydrogen peroxide.
  • acid treatment means, according to the invention, either a treatment with an acid, or a treatment in an acid medium, that is to say combining the action of the acid with another agent, in particular oxygen, hydrogen peroxide, ozone.
  • the hydrophilicity of the dough is obtained thanks to treatments allowing the elimination of hydrophobic extractable products which are resin substances of wood.
  • This elimination is carried out according to the invention by preceding at least one alkaline treatment with an acid treatment. It has been found according to the invention in particular in the case of bisulfite pastes that this acid treatment predisposes the resin to better dissolution by the alkali and therefore promoting its elimination thereafter. But for this acid treatment to be the desired effectiveness, this treatment must be carried out for a duration of at least 15 minutes.
  • the sequence of successive treatments begins with an alkaline treatment.
  • the whitening process according to the invention can use the following treatment sequences, the letters representing the treatments explained below: O - a - P O - a - P - P O - a - P - a - P O - a - P - a - P - a - P O - POa - P O- POa - P - P O - POa - Pa - P O - Pa- O - Pa O - Pa O - POa - POa - POa - POa - POa - POa - POa - POa - POa - PO - P O - POa - PO - P O - POa - PO - P O - POa - PO - PO - PO - PO - PO - PO - PO - PO - PO - - - PO - PO - PO - - - PO - - PO - - PO - - PO
  • This treatment is equivalent to POa treatment.
  • the degree of whiteness is determined according to the ISO 2470 method.
  • the HV8 measurement is determined according to the following method:
  • bleached dry paste test pieces are prepared which have been aged for 8 hours at 105 ° C and conditioned at 20 ° C and 65% relative humidity. These test pieces have the shape of a cylinder 52 mm in diameter and they have a mass of 3 grams.
  • the HV8 measurement is carried out by placing the underside of the test piece in contact with water at 20 ° C and determining the time required for complete wetting of the test piece by capillary rise, under a constant pressure of 2.5 kPa .
  • the method according to the invention makes it possible to reach a degree of whiteness greater than 70 for all the chemical pastes treated and an HV8 value of less than 5 seconds.
  • This HV8 value of 5 seconds corresponds approximately to a content of the resin paste of approximately 0.05%.
  • This example describes the whitening of a bisulphite paste by the use of a sequence e a1P1 / O a2P2
  • I - treatment e it is a treatment with soda.
  • the dough is then washed with water on a rotary filter. The washing juices are eliminated. The dough goes to the next stage.
  • the paste is diluted by the return water from the same stage. Simultaneously adding acid (H2SO4 or water sulfurous).
  • the dough is then sent to a washing filter. Wash with water.
  • III - P1 / O treatment it is a mixed peroxide-oxygen treatment.
  • the dough is pumped after dilution by the return water. It is washed with water on a filter. The dough goes to the next stage.
  • IV - a2 treatment this is an acid treatment.
  • This treatment is identical to treatment a1
  • V - P2 treatment it is a peroxide treatment in an alkaline medium.
  • the paste taken out of the tower by overflow, is diluted with return water and washed with water on a filter.
  • the pulp is sent to the following facilities (purification and Press Pulp).
  • the degree of whiteness measured on the pulp treated according to the example is 80.
  • the resin content, measured by DCM extract is approximately 0.03.
  • the HV8 measurement is 3.5.
  • this example describes the whitening of a bisulfite paste by the use of an O - a1 - P1O - a2 - P2 sequence
  • treatment e is replaced by treatment O.
  • I- O treatment this is an oxygen treatment in the alkaline phase.
  • a pressure regulating valve lets out the dough which is diluted by return juice and sent by pump on a washing filter (water).
  • the treated paste has a degree of whiteness of 82.
  • the HV8 measurement is 3.5.
  • This example describes the whitening of a Kraft pulp by the implementation of an Oa1P1 / Oa2P2 sequence (a2P3)
  • This sequence up to P2 can be modeled on the sequence identical to that described for the bisulfite paste in Example 2.
  • the treated pulp has a whiteness degree of 81.
  • the resin content measured by DCM extract is 0.03%.
  • the HV8 measurement is 3.4.
  • Treatment a3 is identical to treatment a2 and the P3 treatment is identical to the P2 treatment.
  • the whiteness obtained is 83.
  • Example 2 A difference between this example and Example 2 concerns the washing juices.
  • P3 last stage washing
  • the juices are then brought up to O through all the stages of the exit of O, the juices instead of being put in the gutter are used for washing the unbleached dough. They will then be brought up to the boiler via evaporation.
  • a bisulphite paste is treated by the use of an O - P - O - P sequence, that is to say without an acid treatment preceding an alkaline treatment.
  • the treated pulp has a degree of whiteness of 76, which is satisfactory, but the resin content measured by DCM extract is 0.1% and the HV8 measurement is 9 seconds. These values are too high for an absorbent paste, in particular a fluff paste.
  • a bisulphite paste is treated by the use of a PO - PO a - P sequence as described in the publication Das Textil Vol 40, n ° 6, June 1986, pages 258-263, the duration of the acid treatment PO a being of 4 minutes.
  • the treated pulp has a degree of whiteness of 83.
  • the HV8 measurement is 9 seconds and the resin content measured by DCM extract is 0.1%. These values are too high for an absorbent paste.
  • the same bisulfite paste is treated by using a PO - PO a - P sequence as in Comparative Example 2, except that the duration of the acid treatment PO a is 15 minutes.
  • the treated pulp has a degree of whiteness of 83.
  • the HV8 measurement is 4.9 seconds and the resin content measured by DCM extract is 0.04%. These values are suitable for an absorbent paste.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)
  • Polysaccharides And Polysaccharide Derivatives (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)
  • Noodles (AREA)
EP90403462A 1989-12-11 1990-12-06 Procédé de blanchiment de pâtes cellulosiques chimiques Expired - Lifetime EP0433138B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8916322A FR2655668B1 (fr) 1989-12-11 1989-12-11 Procede de blanchiment de pates cellulosiques chimiques.
FR8916322 1989-12-11

Publications (2)

Publication Number Publication Date
EP0433138A1 EP0433138A1 (fr) 1991-06-19
EP0433138B1 true EP0433138B1 (fr) 1994-08-17

Family

ID=9388342

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90403462A Expired - Lifetime EP0433138B1 (fr) 1989-12-11 1990-12-06 Procédé de blanchiment de pâtes cellulosiques chimiques

Country Status (8)

Country Link
EP (1) EP0433138B1 (no)
AT (1) ATE110129T1 (no)
DE (1) DE69011636T2 (no)
DK (1) DK0433138T3 (no)
ES (1) ES2062463T3 (no)
FI (1) FI96784B (no)
FR (1) FR2655668B1 (no)
NO (1) NO176809C (no)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2695947B1 (fr) * 1992-09-18 1994-10-21 Saint Gobain Papier Bois Gie C Procédé de blanchiment de pâtes cellulosiques chimiques.
FI925159A0 (fi) * 1992-11-13 1992-11-13 Ahlstroem Oy Foerfarande foer blekning av massa
SE500616C2 (sv) * 1993-06-08 1994-07-25 Kvaerner Pulping Tech Blekning av kemisk massa med peroxid vid övertryck
BE1007700A3 (fr) * 1993-11-04 1995-10-03 Solvay Interox Procede pour le blanchiment d'une pate a papier chimique.
FI944348A (fi) * 1994-09-19 1996-03-20 Ahlstroem Oy Menetelmä kraft-massan valkaisemiseksi
SE502135C2 (sv) * 1994-08-16 1995-08-28 Kvaerner Pulping Tech Bleksekvens för kemisk massa innefattande ett sulfonerande bleksteg
CA2211223C (en) * 1995-02-17 2002-04-30 Ahlstrom Machinery Oy Method of pretreating pulp to be bleached with peroxide
FI105701B (fi) * 1995-10-20 2000-09-29 Ahlstrom Machinery Oy Menetelmä ja laitteisto massan käsittelemiseksi
DE69608910T2 (de) * 1995-12-07 2001-01-18 Beloit Technologies, Inc. Delignifizierung eines papierzellstoffs mittlerer konsistenz mittels sauerstoff
DE102012009593B4 (de) 2012-05-07 2019-03-07 Innovent E.V. Verfahren zum Abbau von Polysacchariden ausgewählt aus den Stoffgruppen der Glykosaminoglykane und deren Derivaten sowie der Alginate
CN115702272B (zh) * 2020-06-16 2024-08-16 凯米拉公司 用于在漂白期间控制树脂的方法

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE448006B (sv) * 1981-09-21 1987-01-12 Mo Och Domsjoe Ab Forfarande for blekning av cellulosamassa innefattande ett aktiveringssteg med kveveoxider

Also Published As

Publication number Publication date
ATE110129T1 (de) 1994-09-15
DK0433138T3 (da) 1994-12-05
ES2062463T3 (es) 1994-12-16
NO176809B (no) 1995-02-20
NO176809C (no) 1995-05-31
DE69011636T2 (de) 1995-01-26
EP0433138A1 (fr) 1991-06-19
NO905333D0 (no) 1990-12-10
FI906076A0 (fi) 1990-12-10
FI906076A (fi) 1991-06-12
FR2655668A1 (fr) 1991-06-14
NO905333L (no) 1991-06-12
DE69011636D1 (de) 1994-09-22
FR2655668B1 (fr) 1995-06-09
FI96784B (fi) 1996-05-15

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