EP0180529B2 - Procédé pour la préparation des pâtes papetières chimiques en vue du blanchiment - Google Patents
Procédé pour la préparation des pâtes papetières chimiques en vue du blanchiment Download PDFInfo
- Publication number
- EP0180529B2 EP0180529B2 EP85420187A EP85420187A EP0180529B2 EP 0180529 B2 EP0180529 B2 EP 0180529B2 EP 85420187 A EP85420187 A EP 85420187A EP 85420187 A EP85420187 A EP 85420187A EP 0180529 B2 EP0180529 B2 EP 0180529B2
- Authority
- EP
- European Patent Office
- Prior art keywords
- chlorine
- pulp
- treatment
- oxygen
- temperature
- 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
Links
- 229920001131 Pulp (paper) Polymers 0.000 title claims abstract description 7
- 239000000126 substance Substances 0.000 title claims abstract 3
- 238000004519 manufacturing process Methods 0.000 title abstract 2
- 238000004061 bleaching Methods 0.000 title description 12
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims abstract description 44
- 239000000460 chlorine Substances 0.000 claims abstract description 42
- 229910052801 chlorine Inorganic materials 0.000 claims abstract description 42
- 150000002927 oxygen compounds Chemical class 0.000 claims abstract 4
- 239000007844 bleaching agent Substances 0.000 claims abstract 2
- 238000000034 method Methods 0.000 claims description 30
- 230000008569 process Effects 0.000 claims description 24
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 20
- 239000001301 oxygen Substances 0.000 claims description 20
- 229910052760 oxygen Inorganic materials 0.000 claims description 20
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 17
- 238000005406 washing Methods 0.000 claims description 6
- 238000002360 preparation method Methods 0.000 claims description 3
- 238000002203 pretreatment Methods 0.000 claims 3
- 238000011282 treatment Methods 0.000 description 26
- 229920002678 cellulose Polymers 0.000 description 17
- 239000001913 cellulose Substances 0.000 description 17
- 238000004064 recycling Methods 0.000 description 10
- 230000015556 catabolic process Effects 0.000 description 8
- 238000005660 chlorination reaction Methods 0.000 description 8
- 238000006731 degradation reaction Methods 0.000 description 8
- 150000001875 compounds Chemical class 0.000 description 7
- 230000002829 reductive effect Effects 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 239000007900 aqueous suspension Substances 0.000 description 4
- 230000000593 degrading effect Effects 0.000 description 4
- WQYVRQLZKVEZGA-UHFFFAOYSA-N hypochlorite Chemical compound Cl[O-] WQYVRQLZKVEZGA-UHFFFAOYSA-N 0.000 description 4
- 229920005610 lignin Polymers 0.000 description 4
- 150000002978 peroxides Chemical class 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 239000002655 kraft paper Substances 0.000 description 3
- KZBUYRJDOAKODT-UHFFFAOYSA-N Chlorine Chemical compound ClCl KZBUYRJDOAKODT-UHFFFAOYSA-N 0.000 description 2
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 150000001805 chlorine compounds Chemical class 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 239000012978 lignocellulosic material Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000000123 paper Substances 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 206010033733 Papule Diseases 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 150000001804 chlorine Chemical class 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000011121 hardwood Substances 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 229910052943 magnesium sulfate Inorganic materials 0.000 description 1
- 235000019341 magnesium sulphate Nutrition 0.000 description 1
- 231100000219 mutagenic Toxicity 0.000 description 1
- 230000003505 mutagenic effect Effects 0.000 description 1
- 230000036284 oxygen consumption Effects 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 230000001012 protector Effects 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 239000011122 softwood Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
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 the preparation of 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 TAPPl-June 1981 Vol. 64 N ° 6 - pages 91 et seq.).
- US-A-4,402,788 confirms the practice of chlorination using amounts of absorbed chlorine equal to about 4 to 7% and the need to operate at low temperature if one wishes to avoid degradation of the lignocellulosic material that results from hot chlorination, however, carried out at a still relatively low temperature of around 70 ° C before the hydrogen peroxide intervenes.
- the patent FR-A-2 322 235 teaches that a chlorination before action of hydrogen peroxide in a complex sequence for the complete bleaching of cellulose, can only be profitable if it is both partial and of low level by being carried out, even with a reduced amount of chlorine, on a lignocellulosic material having a low consistency, less than 5%, and cold once again.
- 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 making use of 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 allowing the recycling of the effluents after the treatment with the oxygenated 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.
- a commercial kraft pulp, of resinous wood of Kappa index 30 (standard NF-T-12018) is treated, the degree of cellulose polymerization (DP) of which is 1600 (TAPPI-T-230 of 76) with oxygen in an alkaline medium under the following conventional and industrial conditions: 0.5% of magnesium sulfate was introduced as a protector for cellulose.
- 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 to 1280 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 brought to 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 2 the use of oxygen as a delignification treatment agent has been described. It is also possible to use other oxygenated compounds, such as hydrogen peroxide.
- 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)
- Medicines Containing Antibodies Or Antigens For Use As Internal Diagnostic Agents (AREA)
- Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
- Nitrogen Condensed Heterocyclic Rings (AREA)
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 EP0180529A1 (fr) | 1986-05-07 |
| EP0180529B1 EP0180529B1 (fr) | 1988-06-29 |
| EP0180529B2 true EP0180529B2 (fr) | 1992-04-08 |
Family
ID=9309092
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP85420187A Expired - Lifetime EP0180529B2 (fr) | 1984-10-25 | 1985-10-22 | Procédé pour la préparation des pâtes papetières chimiques en vue du blanchiment |
Country Status (9)
| Country | Link |
|---|---|
| EP (1) | EP0180529B2 (fi) |
| JP (1) | JPS61102495A (fi) |
| AT (1) | ATE35433T1 (fi) |
| AU (1) | AU576394B2 (fi) |
| CA (1) | CA1273755A (fi) |
| DE (2) | DE180529T1 (fi) |
| ES (1) | ES8606557A1 (fi) |
| FI (1) | FI82726C (fi) |
| FR (1) | FR2572431B1 (fi) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1544216A (en) * | 1921-08-11 | 1925-06-30 | Donald J Campbell | Molding apparatus |
| GB1262655A (en) * | 1968-09-20 | 1972-02-02 | Canadian Ind | Bleaching of wood pulp |
| JPS51102103A (en) * | 1975-03-05 | 1976-09-09 | Nippon Parupu Kogyo Kk | Ryusanenhoparupuno hyohakuhoho |
| DE2538673C2 (de) * | 1975-08-30 | 1986-01-16 | Degussa Ag, 6000 Frankfurt | Bleichaufschluß von Zellstoff mit erheblich reduziertem Chloreinsatz |
| US4402788A (en) * | 1982-04-26 | 1983-09-06 | Champion International Corporation | Process for bleaching wood pulp with hydrogen peroxide |
-
1984
- 1984-10-25 FR FR8416518A patent/FR2572431B1/fr not_active Expired
-
1985
- 1985-10-22 AT AT85420187T patent/ATE35433T1/de not_active IP Right Cessation
- 1985-10-22 DE DE198585420187T patent/DE180529T1/de active Pending
- 1985-10-22 DE DE8585420187T patent/DE3563548D1/de not_active Expired
- 1985-10-22 EP EP85420187A patent/EP0180529B2/fr not_active Expired - Lifetime
- 1985-10-23 FI FI854148A patent/FI82726C/fi not_active IP Right Cessation
- 1985-10-24 CA CA000493708A patent/CA1273755A/fr not_active Expired - Lifetime
- 1985-10-24 ES ES548166A patent/ES8606557A1/es not_active Expired
- 1985-10-25 AU AU49108/85A patent/AU576394B2/en not_active Ceased
- 1985-10-25 JP JP60239261A patent/JPS61102495A/ja active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| ES8606557A1 (es) | 1986-04-01 |
| ES548166A0 (es) | 1986-04-01 |
| FI854148A0 (fi) | 1985-10-23 |
| EP0180529B1 (fr) | 1988-06-29 |
| FR2572431A1 (fr) | 1986-05-02 |
| FI854148L (fi) | 1986-04-26 |
| EP0180529A1 (fr) | 1986-05-07 |
| DE180529T1 (de) | 1986-12-18 |
| CA1273755A (fr) | 1990-09-11 |
| FI82726B (fi) | 1990-12-31 |
| AU576394B2 (en) | 1988-08-25 |
| ATE35433T1 (de) | 1988-07-15 |
| DE3563548D1 (en) | 1988-08-04 |
| FR2572431B1 (fr) | 1987-12-04 |
| JPS61102495A (ja) | 1986-05-21 |
| AU4910885A (en) | 1986-05-29 |
| FI82726C (fi) | 1991-04-10 |
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| ITCL | It: translation for ep claims filed |
Representative=s name: JACOBACCI CASETTA & PERANI S.P.A. |
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