EP0816558A1 - Verfahren zur Erhöhung des Weissgrades von Papierfaserstoff - Google Patents
Verfahren zur Erhöhung des Weissgrades von Papierfaserstoff Download PDFInfo
- Publication number
- EP0816558A1 EP0816558A1 EP97108991A EP97108991A EP0816558A1 EP 0816558 A1 EP0816558 A1 EP 0816558A1 EP 97108991 A EP97108991 A EP 97108991A EP 97108991 A EP97108991 A EP 97108991A EP 0816558 A1 EP0816558 A1 EP 0816558A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- bleaching
- bleaching process
- whiteness
- gas
- increasing
- 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
Links
- 238000000034 method Methods 0.000 title claims abstract description 42
- 230000008569 process Effects 0.000 title claims abstract description 20
- 238000004061 bleaching Methods 0.000 claims abstract description 25
- 239000007900 aqueous suspension Substances 0.000 claims abstract 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 8
- 239000007789 gas Substances 0.000 claims description 8
- 239000001301 oxygen Substances 0.000 claims description 8
- 229910052760 oxygen Inorganic materials 0.000 claims description 8
- 239000000126 substance Substances 0.000 claims description 8
- 230000000694 effects Effects 0.000 claims description 7
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims description 5
- 229920001131 Pulp (paper) Polymers 0.000 claims description 5
- 229910001882 dioxygen Inorganic materials 0.000 claims description 3
- 150000002978 peroxides Chemical class 0.000 claims description 3
- 238000009896 oxidative bleaching Methods 0.000 claims 1
- 239000000835 fiber Substances 0.000 abstract description 5
- 239000000463 material Substances 0.000 abstract description 4
- 238000006243 chemical reaction Methods 0.000 description 8
- 239000010893 paper waste Substances 0.000 description 5
- 239000000203 mixture Substances 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 229920005610 lignin Polymers 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 239000000975 dye Substances 0.000 description 2
- 239000002657 fibrous material Substances 0.000 description 2
- 239000010812 mixed waste Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000007844 bleaching agent Substances 0.000 description 1
- 150000001720 carbohydrates Chemical class 0.000 description 1
- 235000014633 carbohydrates Nutrition 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000002925 chemical effect Effects 0.000 description 1
- 238000001311 chemical methods and process Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
Images
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
- D21C9/147—Bleaching ; Apparatus therefor with oxygen or its allotropic modifications
-
- 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
- D21C9/163—Bleaching ; Apparatus therefor with per compounds with peroxides
Definitions
- the invention relates to a method for increasing the whiteness of Paper fibers according to the preamble of claim 1.
- DE-AS 19 54 267 describes a method for delignifying cellulosic material, in which pulp is to be produced by breaking down and dissolving out lignin.
- a delignification step with an alkaline extraction is proposed, the effect of which is improved by O 2 or air.
- a Mg compound is added which protects the carbohydrates, ie the cellulose, from chain degradation and thereby prevents the strength of the pulp produced from being reduced.
- a significant increase in the degree of whiteness cannot be achieved with this method, at best a preparation for a subsequent whiteness-increasing bleach.
- Bleaching and delignification are different chemical processes with different effects and parameters, even if the term "bleaching" is sometimes used for delignification in somewhat sloppy usage.
- the subclaims describe particularly advantageous embodiments of the Procedure. Different directions can be followed. As you know, change the flow properties of the fiber material are in the material density range above 5% considerable, depending on how the consistency is chosen for the machining process. Here, e.g. the range between approx. 5 and 12% often as the medium density range and which is referred to as high density or high consistency. There are some indications that the medium density range for the process according to the invention brings special advantages, since the flow properties are still relatively good, although already a high mass concentration in the bleaching vessel is possible. With a bleaching vessel Reactor meant in which the pressurized pulp with the Bleaching chemicals and the above Gas mixture reacts.
- the residence time in which the bleaching process takes place also has an effect on the effect of the Procedure.
- the exact time at which the process runs optimally depends on of course, depending on a variety of boundary conditions. It is often also a economical compromise, since long dwell times improve the effect can, but also require large reaction vessels.
- Waste paper P is suspended in hot water W and, at a consistency of approx. 12%, mixed with chemicals CH in a mixer 1, that is 1% peroxide, 1% NaOH and other auxiliary chemicals.
- the suspension is then conveyed into the pressurized reaction vessel 3 using a medium density pump 2. If the chemicals CH 'are added immediately before the medium density pump 2, this can also function as a mixing pump.
- the reaction vessel 3, in which the substance can remain for about 15 minutes, is designed as an upward-flowing reaction tower. Heated room air A is blown into this vessel at 80 ° C.
- the fiber material treated in this way passes through a blow-out opening 5 into a collecting vessel 6, where it is diluted with water W '.
- the system diagram only shows the actual bleaching section.
- Raw material and requirements are a number of further process steps before and then necessary, e.g. around printed and / or colored waste paper to a white Process quality.
- contaminants have to be removed cannot or should not be bleached.
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Paper (AREA)
Abstract
Description
Altpapier P wird in heißem Wasser W suspendiert und bei einer Stoffdichte von ca. 12 % in einem Mischgerät 1 mit Chemikalien CH, das sind hier 1 % Peroxid, 1 % NaOH und weitere Hilfschemikalien, vermischt. Anschließend wird die Suspension mit einer Mittelstoffdichtepumpe 2 in das unter Druck stehende Reaktionsgefäß 3 gefördert. Werden die Chemikalien CH'unmittelbar vor der Mittelstoffdichtepumpe 2 zugegeben, kann diese auch als Mischpumpe fungieren. Das Reaktionsgefäß 3, in dem der Stoff etwa 15 Minuten verweilen kann, ist als aufwärts durchflossener Reaktionsturm ausgeführt. In dieses Gefäß wird erhitzte Raumluft A bei 80o Celsius mit einem Druck von 1,4 bar absolut durch ein Gebläse 4 eingeblasen, und zwar in einer solchen Menge, daß auch innerhalb des Reaktionsturms dieser Druck aufrechterhalten wird. Durch eine Ausblasöffnung 5 gelangt der so behandelte Faserstoff nach der bereits erwähnten Verweilzeit von ca. 15 Minuten in ein Auffanggefäß 6, wobei er mit Wasser W' verdünnt wird.
Claims (12)
- Verfahren zur Erhöhung des Weißgrades von sich in wässriger Suspension mit mindestens 5 % Trockengehalt befindendem Papierfaserstoff (P) unter Verwendung von oxidierenden Bleich-Chemikalien (CH, CH'), bei dem die Bleichwirkung durch molekularen Sauerstoff weiter erhöht wird und der Bleichprozeß bei einem Überdruck von mindestens 0,1 bar stattfindet,
dadurch gekennzeichnet,
daß der molekulare Sauerstoff aus einem Gas (A) stammt, das zu höchstens 50 % aus Sauerstoff besteht. - Verfahren nach Anspruch 1,
dadurch gekennzeichnet,
daß das Gas (A) Luft ist. - Verfahren nach Anspruch 1 oder 2,
dadurch gekennzeichnet,
daß das Gas (A) dem Papierstoff zugeführt wird. - Verfahren nach Anspruch 3,
dadurch gekennzeichnet,
daß der Überdruck beim Bleichprozeß durch die Zuführung des Gases (A) erzeugt wird. - Verfahren nach Anspruch 1, 2, 3 oder 4,
dadurch gekennzeichnet,
daß die Bleich-Chemikalien (CH, CH') Peroxid enthalten. - Verfahren nach Anspruch 1, 2, 3, 4 oder 5,
dadurch gekennzeichnet,
daß die Bleichdauer, bei der der Papierfaserstoff (P) unter Überdruck steht, mindestens 10 Minuten beträgt. - Verfahren nach Anspruch 1, 2, 3, 4, 5 oder 6,
dadurch gekennzeichnet,
daß der Absolutdruck des Bleichprozesses mindestens 1,5 bar beträgt. - Verfahren nach eindem der voranstehenden Ansprüche,
dadurch gekennzeichnet,
daß der Papierfaserstoff (P) während des Bleichprozesses einen Trockengehalt zwischen 5 und 12 % aufweist. - Verfahren nach Anspruch 1, 2, 3, 4, 5, 6 oder 7,
dadurch gekennzeichnet,
daß der Papierfaserstoff (P) während des Bleichprozesses einen Trockengehalt zwischen 12 und 40 % aufweist. - Verfahren nach einem der voranstehenden Ansprüche,
dadurch gekennzeichnet,
daß die Temperatur während des Bleichprozesses mehr als 60o Celsius beträgt. - Verfahren nach Anspruch 10,
dadurch gekennzeichnet,
daß die Temperatur während des Bleichprozesses mehr als 100o Celsius beträgt. - Verfahren nach einem der voranstehenden Ansprüche,
dadurch gekennzeichnet,
daß das Milieu während des Bleichprozesses mindestens pH = 10 ist.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19626200A DE19626200C2 (de) | 1996-06-29 | 1996-06-29 | Verfahren zur Erhöhung des Weißgrades von Altpapierfaserstoff |
| DE19626200 | 1996-06-29 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0816558A1 true EP0816558A1 (de) | 1998-01-07 |
| EP0816558B1 EP0816558B1 (de) | 2001-12-05 |
Family
ID=7798439
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP97108991A Expired - Lifetime EP0816558B1 (de) | 1996-06-29 | 1997-06-04 | Verfahren zur Erhöhung des Weissgrades von aus Altpapier gewonnenem Papierfaserstoff |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0816558B1 (de) |
| AT (1) | ATE210217T1 (de) |
| CA (1) | CA2208940A1 (de) |
| DE (1) | DE19626200C2 (de) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118223324A (zh) * | 2023-12-27 | 2024-06-21 | 湖南中烟工业有限责任公司 | 一种加热卷烟用接装纸原纸的生产方法 |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19751173A1 (de) * | 1997-11-19 | 1999-05-27 | Voith Sulzer Papiertech Patent | Verfahren zur Erhöhung des Weißgrades von Papierfaserstoff |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1954267A1 (de) * | 1968-10-29 | 1970-06-25 | Mo Och Domsjoe Ab | Verfahren zur Behandlung von cellulosehaltigen Materialien |
| US3754417A (en) * | 1970-01-08 | 1973-08-28 | Canadian Ind | Oxygen bleaching |
| JPS49101601A (de) * | 1973-02-07 | 1974-09-26 | ||
| JPS517203A (en) * | 1974-07-10 | 1976-01-21 | Sadayoshi Watanabe | Arukariekifurikakeo tokuchotosuru kapponkashokubutsuparupuno sansosankaseizoho |
| EP0165867A1 (de) * | 1984-06-15 | 1985-12-27 | L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Verfahren zum Bleichen von mechanischer Pulpe mittels Wasserstoffperoxid |
| JPH0364589A (ja) * | 1989-07-28 | 1991-03-19 | Mitsubishi Gas Chem Co Inc | 化学パルプの漂白方法 |
| US5211809A (en) * | 1991-05-21 | 1993-05-18 | Air Products And Chemicals, Inc,. | Dye removal in oxygen color stripping of secondary fibers |
| EP0557651A1 (de) * | 1992-02-24 | 1993-09-01 | Scott Paper Company | Integriertes Altpapieraufschlussverfahren zur Herstellung von Fasern für Seidenpapier |
-
1996
- 1996-06-29 DE DE19626200A patent/DE19626200C2/de not_active Expired - Fee Related
-
1997
- 1997-06-04 EP EP97108991A patent/EP0816558B1/de not_active Expired - Lifetime
- 1997-06-04 AT AT97108991T patent/ATE210217T1/de not_active IP Right Cessation
- 1997-06-27 CA CA002208940A patent/CA2208940A1/en not_active Abandoned
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1954267A1 (de) * | 1968-10-29 | 1970-06-25 | Mo Och Domsjoe Ab | Verfahren zur Behandlung von cellulosehaltigen Materialien |
| US3754417A (en) * | 1970-01-08 | 1973-08-28 | Canadian Ind | Oxygen bleaching |
| JPS49101601A (de) * | 1973-02-07 | 1974-09-26 | ||
| JPS517203A (en) * | 1974-07-10 | 1976-01-21 | Sadayoshi Watanabe | Arukariekifurikakeo tokuchotosuru kapponkashokubutsuparupuno sansosankaseizoho |
| EP0165867A1 (de) * | 1984-06-15 | 1985-12-27 | L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Verfahren zum Bleichen von mechanischer Pulpe mittels Wasserstoffperoxid |
| JPH0364589A (ja) * | 1989-07-28 | 1991-03-19 | Mitsubishi Gas Chem Co Inc | 化学パルプの漂白方法 |
| US5211809A (en) * | 1991-05-21 | 1993-05-18 | Air Products And Chemicals, Inc,. | Dye removal in oxygen color stripping of secondary fibers |
| EP0557651A1 (de) * | 1992-02-24 | 1993-09-01 | Scott Paper Company | Integriertes Altpapieraufschlussverfahren zur Herstellung von Fasern für Seidenpapier |
Non-Patent Citations (3)
| Title |
|---|
| DATABASE WPI Section Ch Week 7528, Derwent World Patents Index; Class E33, AN 75-46613W, XP002035552 * |
| DATABASE WPI Section Ch Week 7610, Derwent World Patents Index; Class F09, AN 76-17674X, XP002035553 * |
| DATABASE WPI Section Ch Week 9118, Derwent World Patents Index; Class E37, AN 91-127527, XP002035554 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118223324A (zh) * | 2023-12-27 | 2024-06-21 | 湖南中烟工业有限责任公司 | 一种加热卷烟用接装纸原纸的生产方法 |
Also Published As
| Publication number | Publication date |
|---|---|
| DE19626200C2 (de) | 2001-02-01 |
| ATE210217T1 (de) | 2001-12-15 |
| DE19626200A1 (de) | 1997-05-15 |
| CA2208940A1 (en) | 1997-12-29 |
| EP0816558B1 (de) | 2001-12-05 |
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