EP0180529A1 - Verfahren zur Bereitstellung von chemischen Holzpulpen hinsichtlich der Bleiche - Google Patents

Verfahren zur Bereitstellung von chemischen Holzpulpen hinsichtlich der Bleiche Download PDF

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Publication number
EP0180529A1
EP0180529A1 EP85420187A EP85420187A EP0180529A1 EP 0180529 A1 EP0180529 A1 EP 0180529A1 EP 85420187 A EP85420187 A EP 85420187A EP 85420187 A EP85420187 A EP 85420187A EP 0180529 A1 EP0180529 A1 EP 0180529A1
Authority
EP
European Patent Office
Prior art keywords
chlorine
pretreatment
pulp
oxygen
bleaching
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.)
Granted
Application number
EP85420187A
Other languages
English (en)
French (fr)
Other versions
EP0180529B2 (de
EP0180529B1 (de
Inventor
Dominique Lachenal
Christian De Choudens
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 De L'industrie Des Papiers Car
Arkema France SA
Original Assignee
Atochem SA
Elf Atochem SA
Centre Technique de lIndustrie des Papiers Cartons et Celluloses
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=9309092&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0180529(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Atochem SA, Elf Atochem SA, Centre Technique de lIndustrie des Papiers Cartons et Celluloses filed Critical Atochem SA
Priority to AT85420187T priority Critical patent/ATE35433T1/de
Publication of EP0180529A1 publication Critical patent/EP0180529A1/de
Application granted granted Critical
Publication of EP0180529B1 publication Critical patent/EP0180529B1/de
Publication of EP0180529B2 publication Critical patent/EP0180529B2/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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 process for preparing chemical pulp for bleaching.
  • delignification is an operation which consists in removing the maximum of the lignin contained in the fibers. To remove residual lignin and / or degraded by this treatment, the dough must be prepared for the actual bleaching.
  • a second type of process consists in treating the dough by means of oxygen in an alkaline medium.
  • this process makes it possible to recycle the effluents, on the other hand, in practice, one hardly exceeds a lignin extraction rate close to 50%, in order to avoid oxidation and therefore the degradation of the cellulose by l 'oxygen. (see TAPPI-June 1981 Vol.64 N ° 6- pages 91 et seq.).
  • the invention overcomes these drawbacks. It relates to an improved process for the preparation for bleaching by means of a compound containing active chlorine then by means of a compound containing oxygen, which is more economical to use, and which makes it possible to achieve improved delignification rate and whiteness.
  • chlorine pretreatment inhibits the degradation that normally occurs during peroxide bleaching.
  • the method according to the invention makes it possible to achieve an excellent degree of pre-bleaching without, however, degrading the cellulose.
  • the chlorine concentration must be between 0.8 and 1.5% by weight of the weight of the pulp.
  • the temperature of the chlorine pretreatment were less than 50 ° C., this would pose problems from a practical point of view, in particular for using the recycling effluents which are at least at this temperature. Similarly, if this temperature exceeds 100 ° C, it would be necessary to use special devices and a supply of calories, which would make the pretreatment difficult to carry out.
  • the temperature of this chlorine pretreatment must be between 70 and 90 ° C. If the temperature exceeds 90 ° C, there is a tendency to degrade the cellulose without appreciably improving the pre-bleaching. If this temperature is below 70 ° C, the treatment loses its effectiveness.
  • the method according to the invention essentially resides in a particular selection of the operating conditions of a known method of treatment in several phases, one with chlorine, the other using an oxygenated compound. Thanks to this selection in the operating conditions, this pre-bleaching unexpectedly ensures the protection of the cellulose while by allowing the recycling of effluents after treatment with the oxygen compound.
  • the chlorination stage being carried out hot, the recycling of these effluents containing very little chlorides in the washing of the unbleached pulp does not in fact pose any problem.
  • the method according to the invention has overcome this prejudice because one could not expect that by using a similar but different chlorine concentration on a paste having a particular consistency and at an appropriate temperature, the degradation phenomena are more observed caused by both chlorination and oxidation by the oxygenated compound.
  • the levels of reagents indicated will be expressed in percent (%) by weight relative to the weight of the paste counted in dry.
  • a witness is produced by operating in the following manner.
  • the Kappa index is reduced to 14.0 and the DP to 1400.
  • Example 2 The same kraft pulp is used as in Example 1. The latter is treated, before the oxygen treatment, with 1% of chlorine gas, at 70 ° C., for ten minutes, the pulp concentration being 10%.
  • Example 1 After washing, the oxygen treatment is carried out with a 3% sodium hydroxide solution, the other conditions remaining those of Example 1.
  • the ⁇ Kappa index obtained is 9.7 and the DP, instead of falling at 128 as in Example 1, remains at 1350.
  • the degree of polymerization of the cellulose remains at a good level, which allows the mechanical properties of the pulp to be preserved.
  • Example 2 is repeated by simply modifying the temperature of the pretreatment with chlorine which is por 90 ° C.
  • the Kappa index obtained is 8.5 and the DP of 1450.
  • Example 2 is repeated, increasing the soda level to 4% during the oxygen treatment.
  • the Kappa index obtained is 7.9 and the DP only drops to 1300.
  • the Kappa indices obtained in Examples 3 and 4 are of the same level as those obtained by the conventional chlorosodation process (CE) in which approximately 6% chlorine is used.
  • Example 2 is repeated while removing the oxygen.
  • Example 5 the use of oxygen has been described as an agent for the delignification treatment. It is also possible to use other oxygenated compounds, such as hydrogen peroxide.
  • the kraft paste from Example 1 (Kappa number 30, DP 1600) is delignified under the following conditions.
  • the Kappa index is reduced to 17.1 and the DP to 1250.
  • Example 6 is repeated, subjecting the dough to a pretreatment with chlorine under the following conditions:
  • the method according to the invention requires a low consumption of reagent.
  • CE chlorosodation
  • the comparison with the conventional treatment of chlorosodation (CE) shows that practically identical performance, the chlorine level used in the process according to the invention represents only a quarter, even a sixth of that of this treatment (CE).
  • the oxygen consumption in the process according to the invention (2 to 3% maximum) is significant, but the cost of this consumption is low compared to the savings made on chlorine, so that the economic balance of the process is largely positive.
  • the delignification process according to the invention is applicable to any type of chemical pulp regardless of the starting plant (softwood or hardwood, annual plants, etc.).

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)
  • Nitrogen Condensed Heterocyclic Rings (AREA)
  • Medicines Containing Antibodies Or Antigens For Use As Internal Diagnostic Agents (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
EP85420187A 1984-10-25 1985-10-22 Verfahren zur Bereitstellung von chemischen Holzpulpen hinsichtlich der Bleiche Expired - Lifetime EP0180529B2 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85420187T ATE35433T1 (de) 1984-10-25 1985-10-22 Verfahren zur bereitstellung von chemischen holzpulpen hinsichtlich der bleiche.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8416518A FR2572431B1 (fr) 1984-10-25 1984-10-25 Procede pour la preparation des pates papetieres chimiques en vue du blanchiment.
FR8416518 1984-10-25

Publications (3)

Publication Number Publication Date
EP0180529A1 true EP0180529A1 (de) 1986-05-07
EP0180529B1 EP0180529B1 (de) 1988-06-29
EP0180529B2 EP0180529B2 (de) 1992-04-08

Family

ID=9309092

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85420187A Expired - Lifetime EP0180529B2 (de) 1984-10-25 1985-10-22 Verfahren zur Bereitstellung von chemischen Holzpulpen hinsichtlich der Bleiche

Country Status (9)

Country Link
EP (1) EP0180529B2 (de)
JP (1) JPS61102495A (de)
AT (1) ATE35433T1 (de)
AU (1) AU576394B2 (de)
CA (1) CA1273755A (de)
DE (2) DE3563548D1 (de)
ES (1) ES8606557A1 (de)
FI (1) FI82726C (de)
FR (1) FR2572431B1 (de)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2018562A1 (de) * 1968-09-20 1970-05-29 Canadian Ind
FR2322235A1 (fr) * 1975-08-30 1977-03-25 Degussa Attaque blanchissante de la cellulose avec reduction importante de la quantite de chlore utilisee
US4402788A (en) * 1982-04-26 1983-09-06 Champion International Corporation Process for bleaching wood pulp with hydrogen peroxide

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1544216A (en) * 1921-08-11 1925-06-30 Donald J Campbell Molding apparatus
JPS51102103A (en) * 1975-03-05 1976-09-09 Nippon Parupu Kogyo Kk Ryusanenhoparupuno hyohakuhoho

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2018562A1 (de) * 1968-09-20 1970-05-29 Canadian Ind
FR2322235A1 (fr) * 1975-08-30 1977-03-25 Degussa Attaque blanchissante de la cellulose avec reduction importante de la quantite de chlore utilisee
US4402788A (en) * 1982-04-26 1983-09-06 Champion International Corporation Process for bleaching wood pulp with hydrogen peroxide

Also Published As

Publication number Publication date
JPS61102495A (ja) 1986-05-21
FI82726C (fi) 1991-04-10
FI854148L (fi) 1986-04-26
AU576394B2 (en) 1988-08-25
ATE35433T1 (de) 1988-07-15
EP0180529B2 (de) 1992-04-08
DE3563548D1 (en) 1988-08-04
CA1273755A (fr) 1990-09-11
FR2572431B1 (fr) 1987-12-04
FI854148A0 (fi) 1985-10-23
EP0180529B1 (de) 1988-06-29
ES8606557A1 (es) 1986-04-01
DE180529T1 (de) 1986-12-18
ES548166A0 (es) 1986-04-01
FI82726B (fi) 1990-12-31
AU4910885A (en) 1986-05-29
FR2572431A1 (fr) 1986-05-02

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