EP0226114A1 - Procédé de blanchiment et délignification de produits cellulosiques - Google Patents
Procédé de blanchiment et délignification de produits cellulosiques Download PDFInfo
- Publication number
- EP0226114A1 EP0226114A1 EP86116722A EP86116722A EP0226114A1 EP 0226114 A1 EP0226114 A1 EP 0226114A1 EP 86116722 A EP86116722 A EP 86116722A EP 86116722 A EP86116722 A EP 86116722A EP 0226114 A1 EP0226114 A1 EP 0226114A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cyanamide
- pulp
- bleaching
- weight
- peroxide
- 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
- 238000004061 bleaching Methods 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 40
- XZMCDFZZKTWFGF-UHFFFAOYSA-N Cyanamide Chemical compound NC#N XZMCDFZZKTWFGF-UHFFFAOYSA-N 0.000 claims abstract description 38
- 150000002978 peroxides Chemical class 0.000 claims abstract description 21
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 10
- 150000001912 cyanamides Chemical class 0.000 claims abstract description 10
- 239000001301 oxygen Substances 0.000 claims abstract description 10
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 10
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims abstract description 7
- 235000019353 potassium silicate Nutrition 0.000 claims description 8
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 8
- 239000000725 suspension Substances 0.000 claims description 8
- 150000003839 salts Chemical class 0.000 claims description 7
- 229910052751 metal Inorganic materials 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 6
- 239000007864 aqueous solution Substances 0.000 claims description 4
- -1 alkaline earth metal salt Chemical class 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 239000003381 stabilizer Substances 0.000 claims description 3
- MVXMNHYVCLMLDD-UHFFFAOYSA-N 4-methoxynaphthalene-1-carbaldehyde Chemical compound C1=CC=C2C(OC)=CC=C(C=O)C2=C1 MVXMNHYVCLMLDD-UHFFFAOYSA-N 0.000 claims description 2
- 229910052784 alkaline earth metal Inorganic materials 0.000 claims description 2
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 claims description 2
- 239000008139 complexing agent Substances 0.000 claims description 2
- MBEGFNBBAVRKLK-UHFFFAOYSA-N sodium;iminomethylideneazanide Chemical compound [Na+].[NH-]C#N MBEGFNBBAVRKLK-UHFFFAOYSA-N 0.000 claims description 2
- UEUXEKPTXMALOB-UHFFFAOYSA-J tetrasodium;2-[2-[bis(carboxylatomethyl)amino]ethyl-(carboxylatomethyl)amino]acetate Chemical compound [Na+].[Na+].[Na+].[Na+].[O-]C(=O)CN(CC([O-])=O)CCN(CC([O-])=O)CC([O-])=O UEUXEKPTXMALOB-UHFFFAOYSA-J 0.000 claims 1
- 229920002678 cellulose Polymers 0.000 abstract description 13
- 239000001913 cellulose Substances 0.000 abstract description 13
- 239000007844 bleaching agent Substances 0.000 abstract description 6
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 18
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 17
- OSVXSBDYLRYLIG-UHFFFAOYSA-N dioxidochlorine(.) Chemical compound O=Cl=O OSVXSBDYLRYLIG-UHFFFAOYSA-N 0.000 description 14
- 239000000243 solution Substances 0.000 description 14
- 239000004155 Chlorine dioxide Substances 0.000 description 7
- 235000019398 chlorine dioxide Nutrition 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- WQYVRQLZKVEZGA-UHFFFAOYSA-N hypochlorite Chemical compound Cl[O-] WQYVRQLZKVEZGA-UHFFFAOYSA-N 0.000 description 6
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 5
- 239000000460 chlorine Substances 0.000 description 5
- 229920005610 lignin Polymers 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 229920003043 Cellulose fiber Polymers 0.000 description 3
- 229920001131 Pulp (paper) Polymers 0.000 description 3
- 229910052801 chlorine Inorganic materials 0.000 description 3
- 238000000354 decomposition reaction Methods 0.000 description 3
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 102100031260 Acyl-coenzyme A thioesterase THEM4 Human genes 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- 101000638510 Homo sapiens Acyl-coenzyme A thioesterase THEM4 Proteins 0.000 description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 2
- 241000218657 Picea Species 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 238000005660 chlorination reaction Methods 0.000 description 2
- 229910001902 chlorine oxide Inorganic materials 0.000 description 2
- 230000029087 digestion Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- 239000011777 magnesium Substances 0.000 description 2
- 239000000395 magnesium oxide Substances 0.000 description 2
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- PFUVRDFDKPNGAV-UHFFFAOYSA-N sodium peroxide Chemical compound [Na+].[Na+].[O-][O-] PFUVRDFDKPNGAV-UHFFFAOYSA-N 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 239000002023 wood Substances 0.000 description 2
- 238000010626 work up procedure Methods 0.000 description 2
- 241000609240 Ambelania acida Species 0.000 description 1
- KZBUYRJDOAKODT-UHFFFAOYSA-N Chlorine Chemical compound ClCl KZBUYRJDOAKODT-UHFFFAOYSA-N 0.000 description 1
- 244000089486 Phragmites australis subsp australis Species 0.000 description 1
- 235000014676 Phragmites communis Nutrition 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 239000012190 activator Substances 0.000 description 1
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 description 1
- 150000001450 anions Chemical class 0.000 description 1
- 239000010905 bagasse Substances 0.000 description 1
- 159000000009 barium salts Chemical class 0.000 description 1
- 238000005282 brightening Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 150000001805 chlorine compounds Chemical class 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- ZIPLUEXSCPLCEI-UHFFFAOYSA-N cyanamide group Chemical group C(#N)[NH-] ZIPLUEXSCPLCEI-UHFFFAOYSA-N 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 159000000011 group IA salts Chemical class 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 150000004679 hydroxides Chemical class 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- GOKQBRXJUKTYSC-UHFFFAOYSA-N magnesium;azanidylidenemethylideneazanide Chemical compound [Mg+2].[N-]=C=[N-] GOKQBRXJUKTYSC-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 150000002823 nitrates Chemical class 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000002310 reflectometry Methods 0.000 description 1
- 238000009419 refurbishment Methods 0.000 description 1
- 239000010902 straw Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 150000003467 sulfuric acid derivatives Chemical class 0.000 description 1
- 229910000349 titanium oxysulfate Inorganic materials 0.000 description 1
- 239000005418 vegetable material Substances 0.000 description 1
- 239000002351 wastewater 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
- D21C9/1026—Other features in bleaching processes
- D21C9/1036—Use of compounds accelerating or improving the efficiency of the processes
Definitions
- the present invention relates to a method for bleaching and delignifying cellulose-containing products such.
- Standard bleaching generally consists of three stages, with the first stage being chlorination of the residual lignin with chlorine water or chlorine gas at pH 1-2. In the second stage the chlorine lignins are then washed out with water or sodium hydroxide solution, while in the third stage the pulp is subjected to an oxidizing and brightening bleaching with hypochlorite at pH> 6.
- the particularly gentle, but expensive bleach with chlorine dioxide can either be added to the standard bleach or replace the hypochlorite treatment.
- a disadvantage of these processes is the high environmental impact, which is caused above all by the chlorination, because a large amount of chlorine lignins are produced here, which represent a high pollution of wastewater.
- a much more environmentally friendly method is bleaching with peroxides (such as sodium peroxide or hydrogen peroxide) or oxygen or ozone.
- Peroxide bleaching like chlorine dioxide treatment, is used in addition to standard bleaching levels to produce very white pulps.
- these compounds can also be used as sole bleaching agents, particularly in the case of semi-bleaching.
- a disadvantage of these processes is the limited bleaching effect of the peroxides or oxygen, so that the quality of a highly bleached pulp cannot be achieved economically. This is one of the main reasons why these bleaching processes have not yet become widespread.
- the present invention was therefore based on the object of developing a method for bleaching and delignifying cellulose-containing products with peroxides and / or oxygen and / or ozone, which does not have the disadvantages of the prior art mentioned, but which, despite good environmental compatibility, has an excellent bleaching effect .
- This object was achieved according to the invention by additionally using 0.01 to 2.5% by weight of cyanamide and / or cyanamide salts, based on the dry weight of the pulp.
- hydrogen peroxide or sodium peroxide is used in an amount of 1 to 2.5% by weight, based on the dry matter content of the pulp, the H 2 0 2 preferably in a 30 to 35% aqueous solution is used.
- the amount of cyanamide or cyanamide salt used according to the invention depends essentially on the peroxide or oxygen or ozone content and is 0.01 to 2.5% by weight, preferably 0.1 to 1.0% by weight. , based on the dry matter content of the pulp.
- Cyanamide itself can be used both as a solid and as an aqueous solution (for example in the form of a 10 to 60% strength aqueous solution).
- the alkaline salts such as sodium hydrogen cyanamide, calcium cyanamide or magnesium cyanamide are preferably used as cyanamide salts, because a certain alkaline pH value adjustment can be carried out at the same time.
- the alkaline earth ions calcium and magnesium also have a stabilizing effect on the H 2 O 2 solution, as will be explained in more detail below.
- Decomposition of the peroxide during the bleaching process is highly undesirable, since not only is the bleaching effect reduced, but at the same time there is also noticeable damage to the cellulose fiber. To prevent this decomposition, the pulp suspension is still stabilized such.
- B. water glass or complexing agents such.
- such an addition can usually be dispensed with if the heavy metal salts have been removed by washing the pulp before bleaching.
- the cellulose suspension can also be mixed with metal salts, which in addition to the stabilizing effect also have an activating effect on the peroxide.
- metal salts such as magnesium, calcium and barium salts are preferred as metal salts, while the oxides, hydroxides, sulfates, chlorides and nitrates are particularly suitable as anions due to their low cost.
- the optimum pH is 4.0 to 13.0, preferably 5.0 to 10.0, and that temperatures of 20 ° C. to 150 ° C. are preferred are to be seen. Under these conditions, the best results, ie high whiteness with a relatively short treatment time and under gentle conditions, are generally possible, the exact process parameters depending on the type and pretreatment of the pulp used.
- the pulp suspension which generally has a solids content of 3 to 20% by weight, is adjusted to the desired pH using the customary acidic or basic reacting substances, and then the stabilizers or activators such as water glass or metal salts are added . The peroxide or oxygen or ozone and cyanamide are then added. After bleaching at a certain temperature, which takes between 15 minutes and 4 hours depending on the type of whiteness desired, the pulp is worked up. For this purpose, the pulp suspension is adjusted to a pH of 5 to 7 and then the pulp is dewatered or dried.
- the degree of delignification which is defined by the kappa value (see examples), is about 50% cheaper for peroxide or oxygen bleaching with cyanamide than for bleaching without cyanamide.
- the viscosity which is a measure of the degree of polymerization of the cellulose and thus a direct indication of the damage (decomposition) of the cellulose fiber, is significantly better in the process according to the invention than in the processes according to the prior art.
- the method according to the invention can be applied to all cellulose-containing products such as, for. B. sulfite or sulfate pulp, CTMP pulp, needle pulp or wood pulp and are used in all bleaching stages such as pre-bleaching or post-bleaching. It is also possible to combine different levels of lead, e.g. B. peroxide and chlorine dioxide bleach if this appears advantageous for some reason.
- cyanamide in the examples are given in% by weight and, unless stated otherwise, relate to the dry content of the pulp.
- Example 1 The procedure was as in Example 1, but after the hydrogen peroxide had been added, 20 mg of cyanamide in the form of 0.2 g of a 10% cyanamide solution ( ⁇ 0.2% by weight based on the dry content of the pulp) were added. . Reaction conditions and workup cf. Example 1.
- Example 1 The procedure is the same as in Example 4, except that 0.5 g of a 10% strength aqueous cyanamide solution (0.5% by weight) was added after the H 2 O 2 addition. Refurbishment s.
- Example 1 The procedure is the same as in Example 4, except that 0.5 g of a 10% strength aqueous cyanamide solution (0.5% by weight) was added after the H 2 O 2 addition. Refurbishment s.
- Example 6 The procedure is as in Example 6, but with the addition of 4.0 g of a 10% strength aqueous cyanamide solution (1% by weight).
- Example 10 The procedure is as in Example 10, but with the addition of 0.5 g of a 10% aqueous cyanamide solution.
- Example 12 The procedure was as in Example 12, but with the addition of 0.5 g of a 10% cyanamide solution (0.5% by weight).
- Example 14 The procedure is as in Example 14, but with the addition of 0.5 g of a 10 Xigen cyanamide solution.
Landscapes
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Paper (AREA)
- Breeding Of Plants And Reproduction By Means Of Culturing (AREA)
- Optical Transform (AREA)
- Prostheses (AREA)
- Polysaccharides And Polysaccharide Derivatives (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Detergent Compositions (AREA)
- Cereal-Derived Products (AREA)
- Coloring Foods And Improving Nutritive Qualities (AREA)
- Silver Salt Photography Or Processing Solution Therefor (AREA)
- General Preparation And Processing Of Foods (AREA)
- Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT86116722T ATE54475T1 (de) | 1985-12-16 | 1986-12-02 | Verfahren zur bleiche und delignifizierung von zellstoffhaltigen produkten. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19853544398 DE3544398A1 (de) | 1985-12-16 | 1985-12-16 | Verfahren zur bleiche und delignifizierung von zellstoffhaltigen produkten |
| DE3544398 | 1985-12-16 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0226114A1 true EP0226114A1 (fr) | 1987-06-24 |
| EP0226114B1 EP0226114B1 (fr) | 1990-07-11 |
Family
ID=6288532
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP86116722A Expired - Lifetime EP0226114B1 (fr) | 1985-12-16 | 1986-12-02 | Procédé de blanchiment et délignification de produits cellulosiques |
Country Status (9)
| Country | Link |
|---|---|
| US (1) | US5034096A (fr) |
| EP (1) | EP0226114B1 (fr) |
| JP (1) | JPH0723593B2 (fr) |
| AT (1) | ATE54475T1 (fr) |
| CA (1) | CA1277457C (fr) |
| DE (2) | DE3544398A1 (fr) |
| ES (1) | ES2016084B3 (fr) |
| FI (1) | FI85390C (fr) |
| NO (1) | NO169023C (fr) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0442425A1 (fr) * | 1990-02-13 | 1991-08-21 | SKW Trostberg Aktiengesellschaft | Procédé pour le blanchiment et la délignification exempt de chlore de pâtes cellulosiques |
| EP0479319A1 (fr) * | 1990-10-05 | 1992-04-08 | SKW Trostberg Aktiengesellschaft | Procédé pour le blanchiment et la délignification pauvre en chlore de pâtes cellulosiques |
| DE4114134A1 (de) * | 1991-04-30 | 1992-11-05 | Sueddeutsche Kalkstickstoff | Verfahren zur chlorfreien bleiche und delignifizierung von alkalizellstoff |
| DE4128968A1 (de) * | 1991-08-31 | 1993-03-04 | Genkinger Hebe Foerdertech | Verfahren und vorrichtung zum wechseln eines warenbaums in einer webmaschine |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5242464A (en) * | 1991-04-22 | 1993-09-07 | Pyxis Corporation | Method of bleaching wood |
| DE4114135A1 (de) * | 1991-04-30 | 1992-11-05 | Sueddeutsche Kalkstickstoff | Verfahren zur chlorfreien bleiche und delignifizierung von alkalizellstoff |
| US6398908B1 (en) | 1991-04-30 | 2002-06-04 | Eka Nobel Ab | Process for acid bleaching of lignocellulose-containing pulp with a magnesium compound |
| US5411635A (en) * | 1993-03-22 | 1995-05-02 | The Research Foundation Of State University Of New York | Ozone/peroxymonosulfate process for delignifying a lignocellulosic material |
| CA2137450C (fr) * | 1993-04-06 | 2001-07-24 | Jack Kogan | Blanchiment de la pate recyclee a l'ozone et au peroxyde d'hydrogene |
| US5620563A (en) * | 1994-10-31 | 1997-04-15 | Pulp Paper Res Inst | Process for delignification and bleaching of chemical wood pulps with hydrogen peroxide and a dicyandiamide activator |
| US6302997B1 (en) * | 1999-08-30 | 2001-10-16 | North Carolina State University | Process for producing a pulp suitable for papermaking from nonwood fibrous materials |
| US8268122B2 (en) * | 2005-12-02 | 2012-09-18 | Akzo Nobel N.V. | Process of producing high-yield pulp |
| EP1954871B1 (fr) * | 2005-12-02 | 2011-06-29 | Akzo Nobel N.V. | Procede de production de pate a haut rendement |
| US20070131364A1 (en) * | 2005-12-14 | 2007-06-14 | University Of Maine | Process for treating a cellulose-lignin pulp |
| US20100224336A1 (en) * | 2005-12-14 | 2010-09-09 | University Of Maine System Board Of Trustees | Process of bleaching a wood pulp |
| CA2876082C (fr) * | 2012-06-13 | 2021-06-01 | University Of Maine System Board Of Trustees | Procede ecoenergetique pour la preparation de fibres de nanocellulose |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4025453A (en) * | 1976-02-09 | 1977-05-24 | Shell Oil Company | Activated bleaching process and compositions therefor |
| EP0148712A1 (fr) * | 1983-12-29 | 1985-07-17 | Elf Atochem S.A. | Procédé de blanchiment de pâtes papetières par le peroxyde d'hydrogène |
| FR2560898A1 (fr) * | 1984-03-06 | 1985-09-13 | Air Liquide | Procede de destructuration de matieres lignocellulosiques |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE532222C (de) * | 1929-08-30 | 1931-08-29 | Noviston Akt Ges | Verfahren zur Herstellung von Zellstoff durch alkalischen Aufschluss |
| US4158595A (en) * | 1977-07-27 | 1979-06-19 | Hercules Incorporated | Preparation of hydrophilic styrene maleic anhydride copolymer fibers for use in papermaking |
| US4426466A (en) * | 1982-06-09 | 1984-01-17 | Minnesota Mining And Manufacturing Company | Paper treatment compositions containing fluorochemical carboxylic acid and epoxidic cationic resin |
-
1985
- 1985-12-16 DE DE19853544398 patent/DE3544398A1/de not_active Ceased
-
1986
- 1986-12-02 EP EP86116722A patent/EP0226114B1/fr not_active Expired - Lifetime
- 1986-12-02 DE DE8686116722T patent/DE3672577D1/de not_active Expired - Lifetime
- 1986-12-02 ES ES86116722T patent/ES2016084B3/es not_active Expired - Lifetime
- 1986-12-02 AT AT86116722T patent/ATE54475T1/de active
- 1986-12-09 CA CA000524868A patent/CA1277457C/fr not_active Expired - Lifetime
- 1986-12-09 US US06/939,562 patent/US5034096A/en not_active Expired - Fee Related
- 1986-12-10 NO NO864983A patent/NO169023C/no unknown
- 1986-12-15 FI FI865100A patent/FI85390C/fi not_active IP Right Cessation
- 1986-12-16 JP JP61297856A patent/JPH0723593B2/ja not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4025453A (en) * | 1976-02-09 | 1977-05-24 | Shell Oil Company | Activated bleaching process and compositions therefor |
| EP0148712A1 (fr) * | 1983-12-29 | 1985-07-17 | Elf Atochem S.A. | Procédé de blanchiment de pâtes papetières par le peroxyde d'hydrogène |
| FR2560898A1 (fr) * | 1984-03-06 | 1985-09-13 | Air Liquide | Procede de destructuration de matieres lignocellulosiques |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0442425A1 (fr) * | 1990-02-13 | 1991-08-21 | SKW Trostberg Aktiengesellschaft | Procédé pour le blanchiment et la délignification exempt de chlore de pâtes cellulosiques |
| EP0479319A1 (fr) * | 1990-10-05 | 1992-04-08 | SKW Trostberg Aktiengesellschaft | Procédé pour le blanchiment et la délignification pauvre en chlore de pâtes cellulosiques |
| DE4031597A1 (de) * | 1990-10-05 | 1992-04-09 | Sueddeutsche Kalkstickstoff | Verfahren zur chlorarmen bleiche und delignifizierung von zellstoff |
| DE4114134A1 (de) * | 1991-04-30 | 1992-11-05 | Sueddeutsche Kalkstickstoff | Verfahren zur chlorfreien bleiche und delignifizierung von alkalizellstoff |
| DE4128968A1 (de) * | 1991-08-31 | 1993-03-04 | Genkinger Hebe Foerdertech | Verfahren und vorrichtung zum wechseln eines warenbaums in einer webmaschine |
Also Published As
| Publication number | Publication date |
|---|---|
| FI865100A0 (fi) | 1986-12-15 |
| ES2016084B3 (es) | 1990-10-16 |
| EP0226114B1 (fr) | 1990-07-11 |
| JPS62191588A (ja) | 1987-08-21 |
| DE3544398A1 (de) | 1987-06-19 |
| US5034096A (en) | 1991-07-23 |
| NO864983D0 (no) | 1986-12-10 |
| JPH0723593B2 (ja) | 1995-03-15 |
| NO169023C (no) | 1992-04-29 |
| NO864983L (no) | 1987-06-17 |
| FI85390B (fi) | 1991-12-31 |
| FI85390C (fi) | 1992-04-10 |
| CA1277457C (fr) | 1990-12-11 |
| NO169023B (no) | 1992-01-20 |
| FI865100A (fi) | 1987-06-17 |
| DE3672577D1 (de) | 1990-08-16 |
| ATE54475T1 (de) | 1990-07-15 |
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