EP0140804B1 - Traitement à l'hypochlorite de pates papetières chimiques - Google Patents

Traitement à l'hypochlorite de pates papetières chimiques Download PDF

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Publication number
EP0140804B1
EP0140804B1 EP84420167A EP84420167A EP0140804B1 EP 0140804 B1 EP0140804 B1 EP 0140804B1 EP 84420167 A EP84420167 A EP 84420167A EP 84420167 A EP84420167 A EP 84420167A EP 0140804 B1 EP0140804 B1 EP 0140804B1
Authority
EP
European Patent Office
Prior art keywords
hypochlorite
treatment
hydrogen peroxide
pulp
paste
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
Application number
EP84420167A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0140804A1 (fr
Inventor
Dominique Lachenal
Christian De Choudens
Luis Soria-Mozzone
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.)
Centre Technique Industriel Dit Centre Technique
Arkema France SA
Original Assignee
CENTRE TECH IND PAPIER
Centre Technique Industriel dit "CENTRE TECHNIQUE DE L'INDUSTRIE DES PAPIERS CARTONS ET CELLULOSES"
Atochem SA
Elf Atochem SA
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 CENTRE TECH IND PAPIER, Centre Technique Industriel dit "CENTRE TECHNIQUE DE L'INDUSTRIE DES PAPIERS CARTONS ET CELLULOSES", Atochem SA, Elf Atochem SA filed Critical CENTRE TECH IND PAPIER
Priority to AT84420167T priority Critical patent/ATE24745T1/de
Publication of EP0140804A1 publication Critical patent/EP0140804A1/fr
Application granted granted Critical
Publication of EP0140804B1 publication Critical patent/EP0140804B1/fr
Expired legal-status Critical Current

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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
    • D21C9/12—Bleaching ; Apparatus therefor with halogens or halogen-containing compounds
    • D21C9/14—Bleaching ; Apparatus therefor with halogens or halogen-containing compounds with ClO2 or chlorites
    • D21C9/144—Bleaching ; Apparatus therefor with halogens or halogen-containing compounds with ClO2 or chlorites with ClO2/Cl2 and other bleaching agents in a multistage process

Definitions

  • the invention relates to a new hypochlorite treatment for chemical pulp.
  • chemical pulps mainly designates unbleached or thinned cellulose pulps, that is to say still containing lignin, obtained by various processes, for example with acid sulfite, neutral or alkaline, with sulphate (Kraft process), soda, carbonate or oxygen, in the presence or not of a delignification catalyst.
  • the bleaching of cellulose pulps is the treatment which consists in eliminating by action of chemical reagents, the coloring matter associated with cellulose fibers, a large part of which is made up of lignin in a very condensed state and deeply modified during cooking reactions.
  • the bleaching of chemical pulp is mostly done using chlorinated agents, such as chlorine, chlorine dioxide or sodium hypochlorite.
  • the bleaching is carried out by sequences of the CE, D, E 2 D 2 type , that is to say first of all a treatment with chlorine (C), then a first extraction with soda (E ,), then a first treatment with chlorine dioxide (D,), followed by a second extraction with soda (E 2 ) and finally a second treatment with chlorine dioxide (D 2 ).
  • the invention overcomes these drawbacks. It relates to a process which improves the efficiency of the stages of alkaline treatment of the bleaching sequences of chemical pulps, but which is easier and more economical to implement and this without degradation of the cellulose, while improving the whiteness of the pulps as well. treated, without significant deterioration of the mechanical properties.
  • This process for bleaching chemical paper pulps using an alkaline solution of hypochlorite then hydrogen peroxide without prior washing of the treated pulp is characterized in that the hydrogen peroxide is added when 85% about 95% of hypochlorite is consumed.
  • hydrogen peroxide is preferably added when approximately 90% of the hypochlorite has been consumed; this addition is carried out during the alkaline treatment itself. This not only provides better extraction of the lignin, but also greater whitening of the dough, without affecting the quality of the latter.
  • the hydrogen peroxide is added in an amount of 0.1 to 2%, advantageously 0.2 to 0.5% by weight of the weight of the dry counted paste, added of an amount of sodium hydroxide of less than 2% by weight of the weight of the paste counted on a dry basis, without modifying the treatment temperature, the hypochlorite being sodium or calcium hypochlorite and the treated paste being a paste Kraft or sulfite paste.
  • reactant levels are expressed, as above, in percent (%) in, weight of the weight of the paste counted in dry.
  • hydrogen peroxide is added when 85% to 95%, preferably approximately 90% of the hypochlorite has been consumed, which can be considered to be achieved after a reaction time representing approximately three quarters of the time. total reaction usually applied.
  • a witness is produced by operating in the following manner.
  • the paste undergoes a second alkaline extraction carried out this time in the presence of sodium hypochlorite (H) (NaCIO), at a rate of 2%, at 40 ° C., for two hours, with a concentration of 10% paste.
  • H sodium hypochlorite
  • the paste After the CEH sequence, the paste has a whiteness of 56.5 and a DP of 1620.
  • the hypochlorite level is increased to 3% instead of 2% and the duration of treatment to 2.5 hours instead of 2 hours.
  • the paste obtained has a whiteness of 69.5 for a DP of 1330, which illustrates the degrading effect of hypochlorite.
  • the sodium hypochlorite level is further increased to 3.5%.
  • the treated pulp has a whiteness of 71.0 and a DP of 1150. This perfectly illustrates the limits of the treatment with sodium hypochlorite. This treatment certainly improves whiteness, but at the expense of the quality of the dough. Also, if we plan to reduce the cost of bleaching by replacing the CEDED sequence with a CEHDED sequence, or more simply CEH D, the level of hypochlorite used, and therefore the reduction in the level of chlorine dioxide, are limits.
  • Example 1 undergoes the two stages of chlorosodation (CE) of Example 1, then is treated with 2% hypochlorite under the conditions of Example 1. However, after 90 minutes of reaction, the dosage by iodometry of the treatment effluent indicates that 92% of the sodium hypochlorite was consumed.
  • a whiteness paste 90 is obtained, the DP of which is 1450.
  • a second witness is produced by operating in the following manner.
  • Example 3 The same paste is bleached as in Example 3 with a PDH sequence, the first two stages P and D being carried out under the same conditions as in Example 3.
  • the pulp thus treated has a whiteness of 87.0 and a DP of 1451.
  • the conventional stage with sodium hypochlorite certainly makes it possible to achieve a satisfactory objective of whiteness, but results in a notable degradation of the dough.
  • Example 3 the traditional PDED four-stage sequence of Example 3 can be replaced by a sequence comprising only three PD stages (HP), in which (HP) is the alkaline stage according to the invention.
  • the method according to the invention makes it possible both to reduce the consumption of chlorine dioxide in the sequences of the CEHDED, CEDHD type, as well as to reduce the number of bleaching stages, as illustrated in Examples 4 and 5 above. .
  • Example 5 is repeated a first time (Example 6) by reducing the reaction time of the hypochlorite so as to consume only 80% thereof, a second time (Example 7) by increasing this reaction time so as to that almost 98% of hypochlorite is consumed.
  • the whiteness of the pulp treated according to Example 7 is practically identical to that of the pulp of Example 5, itself greater than that of the pulp of Example 6.
  • This process can be successfully applied to all types of chemical pulp, regardless of the starting plant (softwood, hardwood, annual plants, etc.).

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)
  • Detergent Compositions (AREA)
  • Inks, Pencil-Leads, Or Crayons (AREA)
  • Medicines Containing Antibodies Or Antigens For Use As Internal Diagnostic Agents (AREA)
  • Investigating Or Analysing Biological Materials (AREA)
  • Cosmetics (AREA)
EP84420167A 1983-10-13 1984-10-05 Traitement à l'hypochlorite de pates papetières chimiques Expired EP0140804B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84420167T ATE24745T1 (de) 1983-10-13 1984-10-05 Hypochlorit-behandlung von chemischen papierpulpen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8316500 1983-10-13
FR8316500A FR2553444B1 (fr) 1983-10-13 1983-10-13 Traitement a l'hypochlorite de pates papetieres chimiques

Publications (2)

Publication Number Publication Date
EP0140804A1 EP0140804A1 (fr) 1985-05-08
EP0140804B1 true EP0140804B1 (fr) 1987-01-07

Family

ID=9293226

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84420167A Expired EP0140804B1 (fr) 1983-10-13 1984-10-05 Traitement à l'hypochlorite de pates papetières chimiques

Country Status (9)

Country Link
EP (1) EP0140804B1 (enrdf_load_stackoverflow)
JP (1) JPS6099086A (enrdf_load_stackoverflow)
AT (1) ATE24745T1 (enrdf_load_stackoverflow)
AU (1) AU565124B2 (enrdf_load_stackoverflow)
CA (1) CA1269805A (enrdf_load_stackoverflow)
DE (2) DE140804T1 (enrdf_load_stackoverflow)
ES (1) ES8603607A1 (enrdf_load_stackoverflow)
FI (1) FI75374C (enrdf_load_stackoverflow)
FR (1) FR2553444B1 (enrdf_load_stackoverflow)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NZ229702A (en) * 1989-06-23 1993-03-26 Nz Forest Products Ltd Formerl Bleaching chemical pulp including an activation step followed by an alkaline extraction step with no intervening washing step
WO1998026128A1 (en) * 1996-12-11 1998-06-18 Akio Mita Method for storing and transporting cellulosic and process for manufacturing pulp
CN100500990C (zh) * 2005-09-02 2009-06-17 华南理工大学 纸浆清洁漂白方法
JP4968638B2 (ja) * 2005-11-15 2012-07-04 好高 青山 軸状部品の供給装置
JP4941726B2 (ja) * 2007-01-12 2012-05-30 沖縄県 変色木材の漂白方法
JP4943908B2 (ja) * 2007-03-26 2012-05-30 陽一 松本 葛根繊維の製造方法及び該製造方法により得られた葛根繊維
JP2008264866A (ja) * 2007-04-20 2008-11-06 Yoshitaka Aoyama 電気抵抗溶接における電極の動作制御装置と制御方法

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE736070C (de) * 1938-07-01 1943-06-07 Degussa Verfahren zum Behandeln von Zellstoff
US2527563A (en) * 1947-08-13 1950-10-31 Buffalo Electro Chem Co Method of bleaching semichemical pulps
US2661261A (en) * 1950-06-30 1953-12-01 Buffalo Electro Chem Co Method of superbleaching chemical pulp
US2865701A (en) * 1953-12-07 1958-12-23 Nat Distillers Chem Corp Process of bleaching kraft pulp with alkaline hypochlorite bleach acidifying the pulp containing residual chlorine and then bleaching with alkaline peroxide
US2920011A (en) * 1955-03-18 1960-01-05 Waldorf Paper Prod Co Elevated temperature and pressure two stage hypochlorite peroxide pulp bleaching process

Also Published As

Publication number Publication date
FI75374C (fi) 1988-06-09
AU565124B2 (en) 1987-09-03
ES536713A0 (es) 1985-12-16
ES8603607A1 (es) 1985-12-16
DE3461941D1 (en) 1987-02-12
AU3421184A (en) 1985-04-18
ATE24745T1 (de) 1987-01-15
JPS6099086A (ja) 1985-06-01
FI843975L (fi) 1985-04-14
FI843975A0 (fi) 1984-10-10
CA1269805A (fr) 1990-06-05
FR2553444B1 (fr) 1986-07-18
DE140804T1 (de) 1985-12-05
FR2553444A1 (fr) 1985-04-19
FI75374B (fi) 1988-02-29
EP0140804A1 (fr) 1985-05-08
JPS6214678B2 (enrdf_load_stackoverflow) 1987-04-03

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