WO1997008381A1 - Procede pour empecher l'accumulation de metaux dans un processus de blanchiment de pate a papier en circuit ferme - Google Patents
Procede pour empecher l'accumulation de metaux dans un processus de blanchiment de pate a papier en circuit ferme Download PDFInfo
- Publication number
- WO1997008381A1 WO1997008381A1 PCT/SE1996/000997 SE9600997W WO9708381A1 WO 1997008381 A1 WO1997008381 A1 WO 1997008381A1 SE 9600997 W SE9600997 W SE 9600997W WO 9708381 A1 WO9708381 A1 WO 9708381A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- bleaching
- pulp
- metals
- peracetic acid
- value
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims abstract description 26
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 19
- 239000002184 metal Substances 0.000 title claims abstract description 19
- 150000002739 metals Chemical class 0.000 title claims abstract description 19
- 238000009825 accumulation Methods 0.000 title abstract description 5
- 238000004076 pulp bleaching Methods 0.000 title description 3
- 238000004061 bleaching Methods 0.000 claims abstract description 39
- KFSLWBXXFJQRDL-UHFFFAOYSA-N Peracetic acid Chemical compound CC(=O)OO KFSLWBXXFJQRDL-UHFFFAOYSA-N 0.000 claims abstract description 25
- 238000005406 washing Methods 0.000 claims abstract description 5
- 239000000835 fiber Substances 0.000 claims abstract description 3
- 239000003513 alkali Substances 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 239000007844 bleaching agent Substances 0.000 description 6
- 239000002738 chelating agent Substances 0.000 description 5
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 4
- OSVXSBDYLRYLIG-UHFFFAOYSA-N dioxidochlorine(.) Chemical compound O=Cl=O OSVXSBDYLRYLIG-UHFFFAOYSA-N 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 3
- 229910052791 calcium Inorganic materials 0.000 description 3
- 239000011575 calcium Substances 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 2
- 239000004155 Chlorine dioxide Substances 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910001424 calcium ion Inorganic materials 0.000 description 2
- 235000019398 chlorine dioxide Nutrition 0.000 description 2
- 229910001882 dioxygen Inorganic materials 0.000 description 2
- 239000000706 filtrate Substances 0.000 description 2
- 238000009897 hydrogen peroxide bleaching Methods 0.000 description 2
- 150000002978 peroxides Chemical class 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- NJXWZWXCHBNOOG-UHFFFAOYSA-N 3,3-diphenylpropyl(1-phenylethyl)azanium;chloride Chemical compound [Cl-].C=1C=CC=CC=1C(C)[NH2+]CCC(C=1C=CC=CC=1)C1=CC=CC=C1 NJXWZWXCHBNOOG-UHFFFAOYSA-N 0.000 description 1
- KZBUYRJDOAKODT-UHFFFAOYSA-N Chlorine Chemical compound ClCl KZBUYRJDOAKODT-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- QPCDCPDFJACHGM-UHFFFAOYSA-N N,N-bis{2-[bis(carboxymethyl)amino]ethyl}glycine Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(=O)O)CCN(CC(O)=O)CC(O)=O QPCDCPDFJACHGM-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
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 229940043430 calcium compound Drugs 0.000 description 1
- 150000001674 calcium compounds Chemical class 0.000 description 1
- QXDMQSPYEZFLGF-UHFFFAOYSA-L calcium oxalate Chemical compound [Ca+2].[O-]C(=O)C([O-])=O QXDMQSPYEZFLGF-UHFFFAOYSA-L 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000002657 fibrous material Substances 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- ARYKTOJCZLAFIS-UHFFFAOYSA-N hydrogen peroxide;ozone Chemical compound OO.[O-][O+]=O ARYKTOJCZLAFIS-UHFFFAOYSA-N 0.000 description 1
- -1 ide ions Chemical class 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 150000004965 peroxy acids Chemical class 0.000 description 1
- 239000010908 plant waste Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000009877 rendering Methods 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
-
- 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
- D21C9/16—Bleaching ; Apparatus therefor with per compounds
- D21C9/166—Bleaching ; Apparatus therefor with per compounds with peracids
Definitions
- This invention relates to chlorine-free bleaching of pulp from ligno- cellulosic fiber material comprising bleaching with peracetic acid.
- TCF bleaching mostly is carried out with oxygen gas, hydrogen peroxide ozone and/or some type of peracids such as peracetic acid (Paa) . Due to the fact that neither chlorine nor chlorine dioxide are used as bleaching chemical, chloride ions are prevented from accumulating at the chemical recovery when the bleach plant is closed, and thereby the risk of corrosion attacks a.o. in the soda recovery boiler is reduced substantially.
- a chelating agent treatment is carr ⁇ ied out in a separate step before the hydrogen peroxide step (so-called Q-step) .
- the Q-step is carried out in such a way that the pulp is treated with a chelating agent of the type EDTA or DTPA, whereafter the pulp is washed in order to eliminate released metals.
- the conditions normally applied in the Q-step are 70-90 C, 1-2 hours, 10-14% pulp concentration, pH 5-7 and charge of chelating agent mostly of the magnitude 1-3 kg/;;.
- a Paa-step bleaches the pulp much inferior when the pH is increased above pH 7, which renders it difficult to carry out an alkaline TCF bleaching containing peracetic acid.
- the present invention has the object to solve the aforesaid problems. It implies that the peracetic acid bleaching can be carried out under optimum pH conditions for the bleaching while at the same time the metals are bound in the pulp and thereby can follow along out of the bleach plant, so that the bleaching process can be closed.
- the Paa-step is carried out at a temperature of at least 70°C, preferably 80-120°C, for 1-2 hours at pH 5-7, preferably 5-6.
- the Paa-step can be pressurized. This means optimum pH conditions for the peracetic acid bleaching, but also that metals such as calcium and manganese are released.
- the pulp is washed before it is transferred to the next step in the bleaching sequence.
- the pH value is increased to at least 9, preferably 9-12, in the final phase of the Paa-step in order thereby to effect a rebinding of the metals to the fibers in the pulp.
- the bleaching process can thereby be closed in counterflow without risk of accumulation of the metals.
- the pH value should be increased 1-10 preferably 2-5 minutes before the washing. This can be made with help of alkali, which preferably is added in the form of alkaline white water from other parts of the bleaching process.
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Paper (AREA)
Abstract
L'invention concerne un procédé pour blanchir la pâte à papier, consistant à effectuer ce blanchiment à l'acide peracétique, la valeur du pH durant la réaction de blanchiment étant maintenue à 5-7. Dans la phase finale du blanchiment à l'acide peracétique, les métaux libérés dans la pâte sont fixés à nouveau aux fibres de la pâte, par une augmentation de la valeur du pH à au moins 9. La pâte est ensuite lavée. La valeur de pH est augmentée de préférence 1-10 minutes avant le lavage. Il est ainsi possible de mettre le processus de blanchiment à contre-courant en circuit fermé, sans risque d'accumulation des métaux dans ce processus.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| BR9610198A BR9610198A (pt) | 1995-08-30 | 1996-08-09 | Processo no alvejamento de polpa |
| CA002229893A CA2229893A1 (fr) | 1995-08-30 | 1996-08-09 | Procede pour empecher l'accumulation de metaux dans un processus de blanchiment de pate a papier en circuit ferme |
| EP96929609A EP0847460A1 (fr) | 1995-08-30 | 1996-08-09 | Procede pour empecher l'accumulation de metaux dans un processus de blanchiment de pate a papier en circuit ferme |
| AU68926/96A AU6892696A (en) | 1995-08-30 | 1996-08-09 | Method for preventing accumulation of metals in a closed pulp bleaching process |
| NO980872A NO980872D0 (no) | 1995-08-30 | 1998-02-27 | Fremgangsmåte for å forhindre akkumulering av metaller i en lukket masseblekingsprosess |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE9503004A SE9503004L (sv) | 1995-08-30 | 1995-08-30 | Blekning av massa |
| SE9503004-5 | 1995-08-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO1997008381A1 true WO1997008381A1 (fr) | 1997-03-06 |
Family
ID=20399329
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/SE1996/000997 WO1997008381A1 (fr) | 1995-08-30 | 1996-08-09 | Procede pour empecher l'accumulation de metaux dans un processus de blanchiment de pate a papier en circuit ferme |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP0847460A1 (fr) |
| AU (1) | AU6892696A (fr) |
| BR (1) | BR9610198A (fr) |
| CA (1) | CA2229893A1 (fr) |
| NO (1) | NO980872D0 (fr) |
| SE (1) | SE9503004L (fr) |
| WO (1) | WO1997008381A1 (fr) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998051855A1 (fr) * | 1997-05-14 | 1998-11-19 | Mo Och Domsjö Aktiebolag | Procede de reduction des problemes lies au tartre dans la production de pate a papier blanchie, a l'aide d'un circuit ferme de liquide de lavage |
| WO1999000545A1 (fr) * | 1997-06-30 | 1999-01-07 | Sunds Defibrator Industries Ab | Procede de reduction de la teneur en calcium de la phase liquide d'une suspension de pate a papier |
| WO1999027178A1 (fr) * | 1997-11-25 | 1999-06-03 | Amylum Belgium N.V. | Perfectionnements apportes au procede de blanchiment de la pate chimique et dispersions intermediaires de pate |
| WO2006064084A1 (fr) * | 2004-12-16 | 2006-06-22 | Kemira Oyj | Procede d’extraction du manganese de l’eau |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1994005850A1 (fr) * | 1992-08-28 | 1994-03-17 | Sunds Defibrator Industries Aktiebolag | Traitement pour eaux residuelles |
| WO1994012722A1 (fr) * | 1992-11-27 | 1994-06-09 | Eka Nobel Ab | Procede pour blanchir la pate a papier contenant de la lignocellulose |
| WO1995009944A1 (fr) * | 1993-10-01 | 1995-04-13 | Union Camp Patent Holding, Inc. | REDUCTION DES DEPOTS PAR REGULATION DU pH ET DE LA CONCENTRATION DE SELS |
-
1995
- 1995-08-30 SE SE9503004A patent/SE9503004L/ not_active Application Discontinuation
-
1996
- 1996-08-09 WO PCT/SE1996/000997 patent/WO1997008381A1/fr not_active Application Discontinuation
- 1996-08-09 CA CA002229893A patent/CA2229893A1/fr not_active Abandoned
- 1996-08-09 AU AU68926/96A patent/AU6892696A/en not_active Abandoned
- 1996-08-09 EP EP96929609A patent/EP0847460A1/fr not_active Withdrawn
- 1996-08-09 BR BR9610198A patent/BR9610198A/pt not_active Application Discontinuation
-
1998
- 1998-02-27 NO NO980872A patent/NO980872D0/no unknown
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1994005850A1 (fr) * | 1992-08-28 | 1994-03-17 | Sunds Defibrator Industries Aktiebolag | Traitement pour eaux residuelles |
| WO1994012722A1 (fr) * | 1992-11-27 | 1994-06-09 | Eka Nobel Ab | Procede pour blanchir la pate a papier contenant de la lignocellulose |
| WO1995009944A1 (fr) * | 1993-10-01 | 1995-04-13 | Union Camp Patent Holding, Inc. | REDUCTION DES DEPOTS PAR REGULATION DU pH ET DE LA CONCENTRATION DE SELS |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998051855A1 (fr) * | 1997-05-14 | 1998-11-19 | Mo Och Domsjö Aktiebolag | Procede de reduction des problemes lies au tartre dans la production de pate a papier blanchie, a l'aide d'un circuit ferme de liquide de lavage |
| WO1999000545A1 (fr) * | 1997-06-30 | 1999-01-07 | Sunds Defibrator Industries Ab | Procede de reduction de la teneur en calcium de la phase liquide d'une suspension de pate a papier |
| WO1999027178A1 (fr) * | 1997-11-25 | 1999-06-03 | Amylum Belgium N.V. | Perfectionnements apportes au procede de blanchiment de la pate chimique et dispersions intermediaires de pate |
| WO2006064084A1 (fr) * | 2004-12-16 | 2006-06-22 | Kemira Oyj | Procede d’extraction du manganese de l’eau |
Also Published As
| Publication number | Publication date |
|---|---|
| NO980872L (no) | 1998-02-27 |
| EP0847460A1 (fr) | 1998-06-17 |
| AU6892696A (en) | 1997-03-19 |
| BR9610198A (pt) | 1999-06-29 |
| SE9503004L (sv) | 1997-03-01 |
| SE9503004D0 (sv) | 1995-08-30 |
| CA2229893A1 (fr) | 1997-03-06 |
| NO980872D0 (no) | 1998-02-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5785812A (en) | Process for treating oxygen delignified pulp using an organic peracid or salt, complexing agent and peroxide bleach sequence | |
| EP0739434B1 (fr) | Procede ameliore de recyclage de filtrat d'usine de blanchiment | |
| US5853535A (en) | Process for manufacturing bleached pulp including recycling | |
| JPS6320953B2 (fr) | ||
| US6007678A (en) | Process for delignification of lignocellulose-containing pulp with an organic peracid or salts thereof | |
| US5554259A (en) | Reduction of salt scale precipitation by control of process stream Ph and salt concentration | |
| EP0847460A1 (fr) | Procede pour empecher l'accumulation de metaux dans un processus de blanchiment de pate a papier en circuit ferme | |
| EP0656966B1 (fr) | Traitement pour eaux residuelles | |
| JPH1072788A (ja) | 化学パルプ製造中に遷移金属イオンを最小限にする方法およびそのパルプ | |
| NZ258273A (en) | Bleaching lignocellulose pulp using a complexing agent followed by a peracid | |
| CA2219767A1 (fr) | Traitement de pate a papier avec un agent chelateur suivi d'un blanchiment a un ph superieur a 9 | |
| AU686024B2 (en) | Treatment of chemical pulp with a chelating agent and an oxidizing agent in connection with bleaching | |
| US5980689A (en) | Method of separating metal ions from pulp using a chelating agent | |
| JP3360694B2 (ja) | 製紙用化学パルプの脱リグニン漂白方法 | |
| EP0846199B1 (fr) | Traitement d'une pate a papier avec un agent chelatant en au moins deux etapes de melange, sans lavage intermediaire | |
| EP0951599B1 (fr) | Traitement de pate avec un chelateur sans utiliser de tour de blanchiment | |
| WO1994029512A1 (fr) | Procede de blanchiment de la pate de cellulose sans produits chimiques chlores | |
| WO1998014657A1 (fr) | Oxydation des ions metal perturbateurs dans des procedes de blanchiment | |
| JPH06158573A (ja) | 製紙用化学パルプの漂白方法 | |
| EP0831170A2 (fr) | Procédé amélioré de recyclage de filtrat d'usine de blanchiment | |
| SE501581C2 (sv) | Förbehandling av lignocellulosahaltig massa med magnesium- och kalciumförening före peroxidblekning |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| AK | Designated states |
Kind code of ref document: A1 Designated state(s): AU BR CA CN JP NO NZ RU US |
|
| AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): AT BE CH DE DK ES FI FR GB GR IE IT LU MC NL PT SE |
|
| DFPE | Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101) | ||
| 121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
| WWE | Wipo information: entry into national phase |
Ref document number: 1996929609 Country of ref document: EP |
|
| ENP | Entry into the national phase |
Ref document number: 2229893 Country of ref document: CA Ref country code: CA Ref document number: 2229893 Kind code of ref document: A Format of ref document f/p: F |
|
| WWP | Wipo information: published in national office |
Ref document number: 1996929609 Country of ref document: EP |
|
| WWW | Wipo information: withdrawn in national office |
Ref document number: 1996929609 Country of ref document: EP |