DE2219505C3 - Chlorfreie Mehrstufenbleiche von Zellstoff - Google Patents
Chlorfreie Mehrstufenbleiche von ZellstoffInfo
- Publication number
- DE2219505C3 DE2219505C3 DE2219505A DE2219505A DE2219505C3 DE 2219505 C3 DE2219505 C3 DE 2219505C3 DE 2219505 A DE2219505 A DE 2219505A DE 2219505 A DE2219505 A DE 2219505A DE 2219505 C3 DE2219505 C3 DE 2219505C3
- Authority
- DE
- Germany
- Prior art keywords
- peroxide
- bleaching
- stage
- pulp
- chlorine
- 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
- 238000004061 bleaching Methods 0.000 title claims description 52
- 229920002678 cellulose Polymers 0.000 title claims description 8
- 239000001913 cellulose Substances 0.000 title claims description 8
- 238000000034 method Methods 0.000 claims description 37
- 150000002978 peroxides Chemical class 0.000 claims description 32
- 239000007844 bleaching agent Substances 0.000 claims description 22
- 150000004965 peroxy acids Chemical class 0.000 claims description 16
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 13
- 239000000460 chlorine Substances 0.000 claims description 11
- 239000000126 substance Substances 0.000 claims description 11
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims description 10
- 229910052801 chlorine Inorganic materials 0.000 claims description 10
- 230000002378 acidificating effect Effects 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 7
- 239000011734 sodium Substances 0.000 claims description 5
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 4
- OSVXSBDYLRYLIG-UHFFFAOYSA-N dioxidochlorine(.) Chemical compound O=Cl=O OSVXSBDYLRYLIG-UHFFFAOYSA-N 0.000 claims description 4
- 229910052739 hydrogen Inorganic materials 0.000 claims description 4
- 229910052708 sodium Inorganic materials 0.000 claims description 4
- 229920005610 lignin Polymers 0.000 claims description 3
- 239000004155 Chlorine dioxide Substances 0.000 claims description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 2
- 235000019398 chlorine dioxide Nutrition 0.000 claims description 2
- 239000001257 hydrogen Substances 0.000 claims description 2
- 229920002488 Hemicellulose Polymers 0.000 claims 2
- 239000000470 constituent Substances 0.000 claims 1
- 230000036571 hydration Effects 0.000 claims 1
- 238000006703 hydration reaction Methods 0.000 claims 1
- 150000004967 organic peroxy acids Chemical class 0.000 claims 1
- KFSLWBXXFJQRDL-UHFFFAOYSA-N Peracetic acid Chemical compound CC(=O)OO KFSLWBXXFJQRDL-UHFFFAOYSA-N 0.000 description 30
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 12
- 239000002253 acid Substances 0.000 description 9
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 9
- 239000001301 oxygen Substances 0.000 description 9
- 229910052760 oxygen Inorganic materials 0.000 description 9
- 239000002351 wastewater Substances 0.000 description 9
- 238000010790 dilution Methods 0.000 description 8
- 239000012895 dilution Substances 0.000 description 8
- 238000005406 washing Methods 0.000 description 8
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 5
- 150000003839 salts Chemical class 0.000 description 5
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 4
- 238000010411 cooking Methods 0.000 description 4
- 238000001704 evaporation Methods 0.000 description 4
- 230000008020 evaporation Effects 0.000 description 4
- WFDIJRYMOXRFFG-UHFFFAOYSA-N Acetic anhydride Chemical compound CC(=O)OC(C)=O WFDIJRYMOXRFFG-UHFFFAOYSA-N 0.000 description 3
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 description 3
- 150000007513 acids Chemical class 0.000 description 3
- 239000002585 base Substances 0.000 description 3
- LVGQIQHJMRUCRM-UHFFFAOYSA-L calcium bisulfite Chemical compound [Ca+2].OS([O-])=O.OS([O-])=O LVGQIQHJMRUCRM-UHFFFAOYSA-L 0.000 description 3
- 235000010260 calcium hydrogen sulphite Nutrition 0.000 description 3
- 239000004744 fabric Substances 0.000 description 3
- 239000000706 filtrate Substances 0.000 description 3
- 229910021653 sulphate ion Inorganic materials 0.000 description 3
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 229910019093 NaOCl Inorganic materials 0.000 description 2
- 229920001131 Pulp (paper) Polymers 0.000 description 2
- 238000009835 boiling Methods 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 150000001720 carbohydrates Chemical class 0.000 description 2
- 235000014633 carbohydrates Nutrition 0.000 description 2
- 239000008139 complexing agent Substances 0.000 description 2
- 239000007857 degradation product Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- WQYVRQLZKVEZGA-UHFFFAOYSA-N hypochlorite Chemical compound Cl[O-] WQYVRQLZKVEZGA-UHFFFAOYSA-N 0.000 description 2
- 230000035484 reaction time Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 description 2
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000003643 water by type Substances 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-M Bisulfite Chemical compound OS([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-M 0.000 description 1
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-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
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-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
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 241000218657 Picea Species 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 229960000583 acetic acid Drugs 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- -1 calcium peracids Chemical class 0.000 description 1
- MMCOUVMKNAHQOY-UHFFFAOYSA-N carbonoperoxoic acid Chemical compound OOC(O)=O MMCOUVMKNAHQOY-UHFFFAOYSA-N 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 150000001805 chlorine compounds Chemical class 0.000 description 1
- 238000005352 clarification Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000003226 decolorizating effect Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 229910001882 dioxygen Inorganic materials 0.000 description 1
- 239000005446 dissolved organic matter Substances 0.000 description 1
- 239000012362 glacial acetic acid Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- MGFYIUFZLHCRTH-UHFFFAOYSA-N nitrilotriacetic acid Chemical compound OC(=O)CN(CC(O)=O)CC(O)=O MGFYIUFZLHCRTH-UHFFFAOYSA-N 0.000 description 1
- 229960003330 pentetic acid Drugs 0.000 description 1
- 239000005077 polysulfide Substances 0.000 description 1
- 229920001021 polysulfide Polymers 0.000 description 1
- 150000008117 polysulfides Polymers 0.000 description 1
- 235000019353 potassium silicate Nutrition 0.000 description 1
- CZPZWMPYEINMCF-UHFFFAOYSA-N propaneperoxoic acid Chemical compound CCC(=O)OO CZPZWMPYEINMCF-UHFFFAOYSA-N 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- PFUVRDFDKPNGAV-UHFFFAOYSA-N sodium peroxide Chemical compound [Na+].[Na+].[O-][O-] PFUVRDFDKPNGAV-UHFFFAOYSA-N 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 235000010265 sodium sulphite Nutrition 0.000 description 1
- 238000010561 standard procedure Methods 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 239000002699 waste material 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
- D21C9/16—Bleaching ; Apparatus therefor with per compounds
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Paper (AREA)
Priority Applications (11)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2219505A DE2219505C3 (de) | 1972-04-21 | 1972-04-21 | Chlorfreie Mehrstufenbleiche von Zellstoff |
| IT6743273A IT977848B (it) | 1972-04-21 | 1973-02-21 | Procedimento di sbianca delle cellulose |
| FI69873A FI59274C (fi) | 1972-04-21 | 1973-03-07 | Klorfri flerstegsblekning av cellulosa |
| NO97073A NO142003C (no) | 1972-04-21 | 1973-03-09 | Flertrinns-fremgangsmaate til klorfri bleking av cellulose |
| US351783A US3867246A (en) | 1972-04-21 | 1973-04-16 | Chlorine-free multiple step bleaching of cellulose |
| CH562173A CH578087A5 (enExample) | 1972-04-21 | 1973-04-18 | |
| CA169,114A CA987456A (en) | 1972-04-21 | 1973-04-19 | Chlorine-free multi-stage bleaching of cellulose |
| SE7305671A SE405130B (sv) | 1972-04-21 | 1973-04-19 | Klorfri flerstegsblekning av cellulosamassa |
| AT359673A AT328289B (de) | 1972-04-21 | 1973-04-20 | Mehrstufiges verfahren zur chlorfreien bleiche von zellstoff |
| BE6045647A BE845580Q (fr) | 1972-04-21 | 1976-08-26 | Procede en plusieurs etapes, exempt de chlore, pour le blanchiment de pates cellulosiques et produits obtenus par ce procede |
| FR7630794A FR2367859A1 (fr) | 1972-04-21 | 1976-10-13 | Proce |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2219505A DE2219505C3 (de) | 1972-04-21 | 1972-04-21 | Chlorfreie Mehrstufenbleiche von Zellstoff |
| FR7630794A FR2367859A1 (fr) | 1972-04-21 | 1976-10-13 | Proce |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| DE2219505A1 DE2219505A1 (de) | 1973-11-08 |
| DE2219505B2 DE2219505B2 (de) | 1974-03-07 |
| DE2219505C3 true DE2219505C3 (de) | 1974-10-17 |
Family
ID=25763123
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE2219505A Expired DE2219505C3 (de) | 1972-04-21 | 1972-04-21 | Chlorfreie Mehrstufenbleiche von Zellstoff |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US3867246A (enExample) |
| AT (1) | AT328289B (enExample) |
| BE (1) | BE845580Q (enExample) |
| CA (1) | CA987456A (enExample) |
| CH (1) | CH578087A5 (enExample) |
| DE (1) | DE2219505C3 (enExample) |
| FR (1) | FR2367859A1 (enExample) |
| SE (1) | SE405130B (enExample) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3005947B1 (de) * | 1980-02-16 | 1981-01-29 | Degussa | Verfahren zur Bleiche von Zellstoffen mittels organischer Persaeure |
Families Citing this family (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4196043A (en) * | 1970-12-21 | 1980-04-01 | Scott Paper Company | Kraft pulp bleaching and recovery process |
| BE850066A (fr) * | 1976-01-16 | 1977-07-04 | Solvay | Procede pour la regeneration des vieux papiers |
| LU74434A1 (enExample) * | 1976-02-25 | 1977-09-12 | ||
| LU76021A1 (enExample) * | 1976-10-15 | 1978-05-16 | ||
| SE420430B (sv) * | 1978-02-17 | 1981-10-05 | Mo Och Domsjoe Ab | Forfarande for blekning och extraktion av lignocellulosahaltig material med peroxidhaltiga blekmedel |
| AU539108B2 (en) * | 1979-04-17 | 1984-09-13 | Interox Societe Anonyme | Delignification of unbleached chemical pulp |
| US4559103A (en) * | 1982-08-05 | 1985-12-17 | Honshu Seishi Kabushiki Kaisha | Packaging paper and packaging material for packaging metallic material and method of producing the same |
| SE451606B (sv) * | 1982-09-14 | 1987-10-19 | Sca Development Ab | Sett vid blekning av hogutbytesmassor medelst peroxider |
| US4793898A (en) * | 1985-02-22 | 1988-12-27 | Oy Keskuslaboratorio - Centrallaboratorium Ab | Process for bleaching organic peroxyacid cooked material with an alkaline solution of hydrogen peroxide |
| US4883312A (en) * | 1985-11-26 | 1989-11-28 | United Technologies Automotive, Inc. | Panel in-part locators |
| US4756800A (en) * | 1986-09-03 | 1988-07-12 | The United States Of America As Represented By The Secretary Of Agriculture | Method for producing salts of monoperoxysulfuric acid and simultaneously bleaching pulp |
| SE8700569D0 (sv) * | 1987-02-12 | 1987-02-12 | Josef Kubat | An improved peroxide bleaching method |
| CA2053035C (en) * | 1990-10-12 | 1997-09-30 | Repap Enterprises Inc. | Chlorine-free wood pulps and process of making |
| DE4035813A1 (de) * | 1990-11-10 | 1992-05-14 | Akzo Gmbh | Sauerstoffbleichung |
| DE4114134A1 (de) * | 1991-04-30 | 1992-11-05 | Sueddeutsche Kalkstickstoff | Verfahren zur chlorfreien bleiche und delignifizierung von alkalizellstoff |
| DE4114135A1 (de) * | 1991-04-30 | 1992-11-05 | Sueddeutsche Kalkstickstoff | Verfahren zur chlorfreien bleiche und delignifizierung von alkalizellstoff |
| US6007678A (en) * | 1992-11-27 | 1999-12-28 | Eka Nobel Ab | Process for delignification of lignocellulose-containing pulp with an organic peracid or salts thereof |
| WO1994012722A1 (en) † | 1992-11-27 | 1994-06-09 | Eka Nobel Ab | Process for bleaching of lignocellulose-containing pulp |
| SE501325E (sv) * | 1993-01-29 | 1999-09-20 | Kvaerner Pulping Tech | Förfarande för klorfri blekning av massa, varvid massan surgöres med ättiksyra vid behandlingen med komplexbildare |
| US6605181B1 (en) * | 1993-10-01 | 2003-08-12 | Kvaerner Pulping Aktiebolag | Peroxide bleach sequence including an acidic bleach stage and including a wash stage |
| US20080087390A1 (en) * | 2006-10-11 | 2008-04-17 | Fort James Corporation | Multi-step pulp bleaching |
| US8845860B2 (en) | 2010-09-16 | 2014-09-30 | Georgia-Pacific Consumer Products Lp | High brightness pulps from lignin rich waste papers |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1828848A (en) * | 1929-03-09 | 1931-10-27 | Brown Co | Production of chemical wood pulps |
| US3085039A (en) * | 1960-08-23 | 1963-04-09 | Fmc Corp | Process for the treatment of wood |
| NO109292C (enExample) * | 1962-07-16 | |||
| US3382149A (en) * | 1964-10-29 | 1968-05-07 | Du Pont | Bleaching of hardwood sulfite pulp with hydrogen peroxide, including pretreatment with alkali |
| US3457023A (en) * | 1965-07-07 | 1969-07-22 | Union Carbide Corp | Room-temperature bleaching of textiles with peracetic acid |
| US3345250A (en) * | 1966-06-30 | 1967-10-03 | Int Paper Co | Bleaching pulp without direct chlorination by bleaching with chlorine dioxide |
| US3720577A (en) * | 1970-05-25 | 1973-03-13 | Int Paper Co | Chlorine dioxide-peracetic acid-chlorine dioxide pulp bleaching sequence |
| US3707438A (en) * | 1970-09-15 | 1972-12-26 | Atlantic Richfield Co | Method for the brightening of kraft pulp with tertiary butyl hydroperoxide |
| US3645840A (en) * | 1971-01-19 | 1972-02-29 | Atlantic Richfield Co | Method for peroxide bleaching of pulp |
| US3719552A (en) * | 1971-06-18 | 1973-03-06 | American Cyanamid Co | Bleaching of lignocellulosic materials with oxygen in the presence of a peroxide |
-
1972
- 1972-04-21 DE DE2219505A patent/DE2219505C3/de not_active Expired
-
1973
- 1973-04-16 US US351783A patent/US3867246A/en not_active Expired - Lifetime
- 1973-04-18 CH CH562173A patent/CH578087A5/xx not_active IP Right Cessation
- 1973-04-19 SE SE7305671A patent/SE405130B/xx unknown
- 1973-04-19 CA CA169,114A patent/CA987456A/en not_active Expired
- 1973-04-20 AT AT359673A patent/AT328289B/de not_active IP Right Cessation
-
1976
- 1976-08-26 BE BE6045647A patent/BE845580Q/xx active
- 1976-10-13 FR FR7630794A patent/FR2367859A1/fr active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3005947B1 (de) * | 1980-02-16 | 1981-01-29 | Degussa | Verfahren zur Bleiche von Zellstoffen mittels organischer Persaeure |
Also Published As
| Publication number | Publication date |
|---|---|
| AT328289B (de) | 1976-03-10 |
| FR2367859A1 (fr) | 1978-05-12 |
| DE2219505B2 (de) | 1974-03-07 |
| FR2367859B1 (enExample) | 1980-10-17 |
| US3867246A (en) | 1975-02-18 |
| CA987456A (en) | 1976-04-20 |
| SE405130B (sv) | 1978-11-20 |
| CH578087A5 (enExample) | 1976-07-30 |
| DE2219505A1 (de) | 1973-11-08 |
| ATA359673A (de) | 1975-05-15 |
| BE845580Q (fr) | 1976-12-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C3 | Grant after two publication steps (3rd publication) | ||
| E77 | Valid patent as to the heymanns-index 1977 | ||
| 8339 | Ceased/non-payment of the annual fee |