EP0222674B1 - Procédé de blanchiment de pâtes papetières chimiques - Google Patents
Procédé de blanchiment de pâtes papetières chimiques Download PDFInfo
- Publication number
- EP0222674B1 EP0222674B1 EP86420266A EP86420266A EP0222674B1 EP 0222674 B1 EP0222674 B1 EP 0222674B1 EP 86420266 A EP86420266 A EP 86420266A EP 86420266 A EP86420266 A EP 86420266A EP 0222674 B1 EP0222674 B1 EP 0222674B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pulp
- alkaline extraction
- weight
- chlorine dioxide
- process according
- 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
Links
- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000004061 bleaching Methods 0.000 title claims abstract description 18
- 239000000126 substance Substances 0.000 title claims abstract description 5
- 229920001131 Pulp (paper) Polymers 0.000 title description 7
- OSVXSBDYLRYLIG-UHFFFAOYSA-N dioxidochlorine(.) Chemical compound O=Cl=O OSVXSBDYLRYLIG-UHFFFAOYSA-N 0.000 claims abstract description 64
- 238000000605 extraction Methods 0.000 claims abstract description 37
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims abstract description 36
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 36
- 239000004155 Chlorine dioxide Substances 0.000 claims abstract description 32
- 235000019398 chlorine dioxide Nutrition 0.000 claims abstract description 32
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims abstract description 23
- 238000011282 treatment Methods 0.000 claims abstract description 23
- 239000000460 chlorine Substances 0.000 claims abstract description 19
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000001301 oxygen Substances 0.000 claims abstract description 17
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 17
- 229910001902 chlorine oxide Inorganic materials 0.000 claims abstract description 7
- 229910052801 chlorine Inorganic materials 0.000 claims description 12
- 239000011122 softwood Substances 0.000 claims description 3
- 239000003153 chemical reaction reagent Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000007844 bleaching agent Substances 0.000 description 2
- 238000010411 cooking Methods 0.000 description 2
- 239000002655 kraft paper Substances 0.000 description 2
- 239000007800 oxidant agent Substances 0.000 description 2
- 150000002978 peroxides Chemical class 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 1
- 239000005708 Sodium hypochlorite Substances 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 150000001804 chlorine Chemical class 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 229920005610 lignin Polymers 0.000 description 1
- 239000012978 lignocellulosic material Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-L sulfite Chemical compound [O-]S([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-L 0.000 description 1
- 229910021653 sulphate ion Inorganic materials 0.000 description 1
- 230000002087 whitening effect Effects 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
- D21C9/1026—Other features in bleaching processes
Definitions
- the present invention relates to a process for bleaching chemical pulp.
- the bleaching of chemical paper pulp that is to say unbleached cellulose pulp obtained by cooking lignocellulosic materials according to the so-called sulphite, sulphate or Kraft, soda or carbonate processes, is generally practiced in industry using chlorine or chlorine derivatives having as chlorine an oxidizing character, such as chlorine dioxide C10 2 or sodium hypochlorite NaOCI.
- None of these oxidizing agents is, however, capable of ensuring satisfactory whitening alone in a single operation. It is necessary to operate in several distinct stages and in intermediate operations such as in particular so-called alkaline bath extraction operations.
- a treatment with chlorine and chlorine dioxide in solution a first alkaline extraction with sodium hydroxide in solution
- a treatment with chlorine dioxide in solution a second alkaline extraction of the type of the first
- a second treatment with chlorine dioxide in solution it has been proposed to act either oxygen during the first alkaline extraction, i.e. hydrogen peroxide during the second alkaline extraction.
- the process of the invention has the advantage of achieving the aim aimed at on the two above plans without, moreover, affecting the quality of the bleached pulp finally obtained.
- the process of the invention is particularly suitable for bleaching chemical pulp from softwood.
- the amount of oxygen during the first alkaline extraction is generally between 0.2% and 1% by weight of the weight of dry pulp.
- the amount of hydrogen peroxide used during the second alkaline extraction is most often between 0.1% and 0.5% by weight of the weight of dry pulp.
- the treatment of the pulp with chlorine and chlorine dioxide in solution is carried out in known manner in a single bath, by means of an amount of total active chlorine in the form of chlorine and chlorine dioxide generally between 3% and 10% by weight of the weight of dry pulp, the amount of chlorine dioxide can advantageously represent from 10% to 70%, preferably up to 50% of the total active chlorine, at a temperature generally between 20 ° C and 50 ° C, for a period which may be between 5 minutes and 60 minutes, the action of chlorine dioxide acting simultaneously or, preferably, prior to that of chlorine and the pulp having a consistency most commonly understood between about 3% and 5%.
- the first alkaline extraction is carried out in the presence of oxygen as it usually is in the absence of this reagent, at a temperature of between approximately 50 ° C and 80 ° C, for a period most often of between 1 hour and 2 hours, using an amount of sodium hydroxide generally between 2% and 5% by weight of the weight of the dry dough, the consistency of the dough can generally be between 10% and 15% .
- the treatment of the dough with chlorine dioxide which follows the first alkaline extraction, relates to a dough whose consistency is between about 10% and 15%, for about 1 hour to 4 hours at a temperature generally between 60 ° C and 90 ° C.
- the second alkaline extraction carried out in the presence of hydrogen peroxide, is carried out at a temperature generally between approximately 70 ° C. and 90 ° C. for approximately 0.5 hour to 2 hours, using a quantity sodium hydroxide generally representing from 0.5% to 2% by weight of the weight of dry dough, the consistency of the dough being most frequently between 10% and 15%.
- the treatment of the pulp with chlorine dioxide, which follows the second alkaline extraction, is carried out under conditions analogous to those described for the treatment with the same reagent which follows the first alkaline extraction.
- the quantity of chlorine dioxide generally employed in the two treatments of the pulp by means of this reagent which respectively follow the first and the second alkaline extraction depends on the conditions adopted according to the invention for the combined intervention of oxygen and hydrogen peroxide. It remains much lower, as is apparent from the examples which are given below, than that generally between 1% and 4% by weight of the weight of dry pulp, which is required, in the absence of the combined invention of the oxygen and hydrogen peroxide according to the invention, to achieve the same bleaching effect as that provided by proceeding according to the invention.
- the conditions of the process of the invention can advantageously be determined so that it does not exceed 1% and is even much less than 0.5% by weight of the weight of dry pulp.
- E 2 same meaning as E i .
- D 2 same meaning as D 1 , D 2 following the second alkaline extraction E 2 or E 2 / P as appropriate.
- the amounts of reagents are expressed in percent by weight relative to the weight of dry paste, except in the case of particular indication.
- the state of the dough is defined by its degree of polymerization dp and by its whiteness expressed in ELREPHO degrees: ° ER as it is commonly measured by a person skilled in the art using an ELREPHO spectrophotometer from the company CARL ZEISS .
- the bleached pulp which ultimately results from this bleaching sequence has a whiteness of 90.1 ° ER.
- a whiteness close to 89 ° ER (88.4 ° ER) is found only when a quantity of CI0 2 4 times greater in D 1 , 3 times greater in D 2 is used in comparison with the process according to the invention .
- the process carried out as in the invention delivers a bleached pulp whose qualities, in particular of dp, are at least equal to those of the bleached pulps obtained by known methods, and this, although one might have feared the opposite.
- Example 1 By carrying out the process of the invention as described at the beginning of Example 1 up to D 1 , but, starting from D 1 , in a manner which differs from that of Example 1 in that the quantities of CI0 2 involved in D 1 and D 2 are 0.1% and 0.4% respectively and in that the quantity of hydrogen peroxide in E 2 / P is no more than 0.1 %, the whiteness index of the pulp thus bleached still reaches nearly 88.5 ° ER.
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Paper (AREA)
- Detergent Compositions (AREA)
- Measuring Pulse, Heart Rate, Blood Pressure Or Blood Flow (AREA)
- Measurement And Recording Of Electrical Phenomena And Electrical Characteristics Of The Living Body (AREA)
- Agricultural Chemicals And Associated Chemicals (AREA)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT86420266T ATE48291T1 (de) | 1985-10-30 | 1986-10-28 | Verfahren zum bleichen von chemischen holzpulpen. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8516332A FR2589494B1 (fr) | 1985-10-30 | 1985-10-30 | Procede de blanchiment de pates papetieres chimiques |
| FR8516332 | 1985-10-30 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0222674A1 EP0222674A1 (fr) | 1987-05-20 |
| EP0222674B1 true EP0222674B1 (fr) | 1989-11-29 |
Family
ID=9324477
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP86420266A Expired EP0222674B1 (fr) | 1985-10-30 | 1986-10-28 | Procédé de blanchiment de pâtes papetières chimiques |
Country Status (11)
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4031597A1 (de) * | 1990-10-05 | 1992-04-09 | Sueddeutsche Kalkstickstoff | Verfahren zur chlorarmen bleiche und delignifizierung von zellstoff |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6569284B1 (en) * | 1996-09-24 | 2003-05-27 | International Paper Company | Elemental-chlorine-free bleaching process having an initial Eo or Eop stage |
| FR3062138B1 (fr) * | 2017-01-23 | 2019-06-07 | Centre Technique De L'industrie Des Papiers, Cartons Et Celluloses | Procede de blanchiment d'une pate a papier |
-
1985
- 1985-10-30 FR FR8516332A patent/FR2589494B1/fr not_active Expired
-
1986
- 1986-10-28 EP EP86420266A patent/EP0222674B1/fr not_active Expired
- 1986-10-28 DE DE198686420266T patent/DE222674T1/de active Pending
- 1986-10-28 AT AT86420266T patent/ATE48291T1/de not_active IP Right Cessation
- 1986-10-28 ES ES86420266T patent/ES2000019B3/es not_active Expired - Lifetime
- 1986-10-28 DE DE8686420266T patent/DE3667184D1/de not_active Revoked
- 1986-10-29 AU AU64492/86A patent/AU603556B2/en not_active Ceased
- 1986-10-29 NO NO864319A patent/NO864319L/no unknown
- 1986-10-29 PT PT83649A patent/PT83649B/pt not_active IP Right Cessation
- 1986-10-29 FI FI864411A patent/FI85294B/fi not_active Application Discontinuation
- 1986-10-30 ZA ZA868275A patent/ZA868275B/xx unknown
- 1986-10-30 JP JP61259562A patent/JPS62141188A/ja active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4031597A1 (de) * | 1990-10-05 | 1992-04-09 | Sueddeutsche Kalkstickstoff | Verfahren zur chlorarmen bleiche und delignifizierung von zellstoff |
Also Published As
| Publication number | Publication date |
|---|---|
| PT83649B (pt) | 1989-05-31 |
| PT83649A (fr) | 1986-11-01 |
| JPS62141188A (ja) | 1987-06-24 |
| JPH0116958B2 (enrdf_load_stackoverflow) | 1989-03-28 |
| FR2589494A1 (fr) | 1987-05-07 |
| ES2000019A4 (es) | 1987-09-16 |
| AU6449286A (en) | 1987-05-07 |
| NO864319D0 (no) | 1986-10-29 |
| DE3667184D1 (de) | 1990-01-04 |
| EP0222674A1 (fr) | 1987-05-20 |
| NO864319L (no) | 1987-05-04 |
| FR2589494B1 (fr) | 1988-07-29 |
| ZA868275B (en) | 1987-06-24 |
| FI864411A0 (fi) | 1986-10-29 |
| FI85294B (fi) | 1991-12-13 |
| DE222674T1 (de) | 1987-10-15 |
| ES2000019B3 (es) | 1990-03-16 |
| ATE48291T1 (de) | 1989-12-15 |
| AU603556B2 (en) | 1990-11-22 |
| FI864411L (fi) | 1987-05-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0578304B1 (fr) | Procédé pour le blanchiment d'une pâte à papier chimique | |
| EP0208625B1 (fr) | Traitement de pâtes papetières chimiques par le peroxyde d'hydrogène en vue de leur blanchiment | |
| EP0222674B1 (fr) | Procédé de blanchiment de pâtes papetières chimiques | |
| EP0553141B1 (fr) | Procede pour la preservation des caracteristiques de resistance mecanique des pates a papier chimiques | |
| FR2666597A1 (fr) | Procede sans chlore moleculaire pour le blanchiment de la pate a papier. | |
| EP0148712B1 (fr) | Procédé de blanchiment de pâtes papetières par le peroxyde d'hydrogène | |
| BE1004674A3 (fr) | Procede pour le blanchiment d'une pate a papier chimique et application de ce procede au blanchiment d'une pate kraft. | |
| US8268120B2 (en) | Method for bleaching chemical paper pulps by final ozone treatment at high temperature | |
| EP3008240B1 (fr) | Procede de traitement des pates papetieres chimiques par traitement a l'ozone en presence d'ions magnesium | |
| EP0140804B1 (fr) | Traitement à l'hypochlorite de pates papetières chimiques | |
| EP0513140A1 (en) | A process for the bleaching of chemical pulp. | |
| EP0535741B1 (fr) | Procédé pour l'amélioration de la sélectivité de la délignification d'une pâte à papier chimique | |
| BE1005800A3 (fr) | Procede pour la delignification et le blanchiment d'une pate a papier chimique. | |
| EP0313478A1 (fr) | Procédé de blanchiment de pâtes | |
| EP2118144B1 (fr) | Procede de fonctionnalisation des fibres cellulosiques des pâtes à papier | |
| EP0190723A1 (fr) | Procédé pour l'amélioration des propriétés mécaniques d'une pâte à papier chimique ou semi-chimique de bagasse | |
| FR2568605A1 (fr) | Perfectionnements a la delignification de pate a papier. | |
| BE1007272A3 (fr) | Procede pour le blanchiment d'une pate a papier. | |
| BE1005094A3 (fr) | Procede pour la preservation des caracteristiques de resistance mecanique des pates a papier chimiques et application de ce procede au blanchiment et a la delignification des pates kraft. | |
| FR2599398A1 (fr) | Procede de preblanchiment de pates chimiques de cellulose | |
| CH332821A (fr) | Procédé de délignification et/ou de blanchiment de fibres cellulosiques | |
| FR2670513A1 (fr) | Procede de blanchiment des pates papetieres chimiques par traitement a l'oxygene en deux stades. | |
| CA2175817A1 (fr) | Procede pour le blanchiment d'une pate a papier chimique | |
| BE656601A (enrdf_load_stackoverflow) | ||
| CH645146A5 (fr) | Procede pour la fabrication de pate papetiere chimique et pate ainsi obtenue. |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| 17P | Request for examination filed |
Effective date: 19861031 |
|
| AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE DE ES FR IT SE |
|
| ITCL | It: translation for ep claims filed |
Representative=s name: JACOBACCI CASETTA & PERANI S.P.A. |
|
| TCAT | At: translation of patent claims filed | ||
| DET | De: translation of patent claims | ||
| 17Q | First examination report despatched |
Effective date: 19880629 |
|
| GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
| AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): AT BE DE ES FR IT SE |
|
| REF | Corresponds to: |
Ref document number: 48291 Country of ref document: AT Date of ref document: 19891215 Kind code of ref document: T |
|
| ITF | It: translation for a ep patent filed | ||
| REF | Corresponds to: |
Ref document number: 3667184 Country of ref document: DE Date of ref document: 19900104 |
|
| PLBI | Opposition filed |
Free format text: ORIGINAL CODE: 0009260 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: AT Payment date: 19901011 Year of fee payment: 5 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: SE Payment date: 19901012 Year of fee payment: 5 Ref country code: FR Payment date: 19901012 Year of fee payment: 5 |
|
| 26 | Opposition filed |
Opponent name: DEGUSSA AG, FRANKFURT - ZWEIGNIEDERLASSUNG WOLFGAN Effective date: 19900814 Opponent name: INTEROX, S.A. Effective date: 19900811 |
|
| ITTA | It: last paid annual fee | ||
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: BE Payment date: 19901129 Year of fee payment: 5 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 19901130 Year of fee payment: 5 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: ES Payment date: 19911017 Year of fee payment: 6 |
|
| RDAG | Patent revoked |
Free format text: ORIGINAL CODE: 0009271 |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: PATENT REVOKED |
|
| 27W | Patent revoked |
Effective date: 19910819 |
|
| BERE | Be: lapsed |
Owner name: ATOCHEM Effective date: 19911031 |
|
| EUG | Se: european patent has lapsed |
Ref document number: 86420266.8 Effective date: 19920108 |