FI59432C - Foerfarande foer blekning av kemiska massor - Google Patents
Foerfarande foer blekning av kemiska massor Download PDFInfo
- Publication number
- FI59432C FI59432C FI1406/71A FI140671A FI59432C FI 59432 C FI59432 C FI 59432C FI 1406/71 A FI1406/71 A FI 1406/71A FI 140671 A FI140671 A FI 140671A FI 59432 C FI59432 C FI 59432C
- Authority
- FI
- Finland
- Prior art keywords
- pulp
- weight
- stage
- oven
- concentration
- Prior art date
Links
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 27
- OSVXSBDYLRYLIG-UHFFFAOYSA-N dioxidochlorine(.) Chemical compound O=Cl=O OSVXSBDYLRYLIG-UHFFFAOYSA-N 0.000 claims description 26
- 238000004061 bleaching Methods 0.000 claims description 17
- KFSLWBXXFJQRDL-UHFFFAOYSA-N Peracetic acid Chemical compound CC(=O)OO KFSLWBXXFJQRDL-UHFFFAOYSA-N 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 14
- 239000004155 Chlorine dioxide Substances 0.000 claims description 13
- 238000006243 chemical reaction Methods 0.000 claims description 13
- 235000019398 chlorine dioxide Nutrition 0.000 claims description 13
- 229920001131 Pulp (paper) Polymers 0.000 claims description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 8
- 239000003755 preservative agent Substances 0.000 claims description 8
- 239000011734 sodium Substances 0.000 claims description 8
- 229910052760 oxygen Inorganic materials 0.000 claims description 7
- 239000001301 oxygen Substances 0.000 claims description 7
- 230000002335 preservative effect Effects 0.000 claims description 7
- 239000002699 waste material Substances 0.000 claims description 5
- -1 peroxy compound Chemical class 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 12
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 5
- 239000000460 chlorine Substances 0.000 description 5
- 229910052801 chlorine Inorganic materials 0.000 description 5
- 230000035484 reaction time Effects 0.000 description 4
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 3
- 238000004076 pulp bleaching Methods 0.000 description 3
- LSNNMFCWUKXFEE-UHFFFAOYSA-L sulfite Chemical compound [O-]S([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-L 0.000 description 3
- 229910021653 sulphate ion Inorganic materials 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 2
- 229910020275 Na2Sx Inorganic materials 0.000 description 2
- 229920002678 cellulose Polymers 0.000 description 2
- 239000001913 cellulose Substances 0.000 description 2
- 238000005119 centrifugation Methods 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000011109 contamination Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000008367 deionised water Substances 0.000 description 2
- 229910021641 deionized water Inorganic materials 0.000 description 2
- 239000011121 hardwood Substances 0.000 description 2
- 229920005610 lignin Polymers 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000007800 oxidant agent Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000010561 standard procedure Methods 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 1
- 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 description 1
- 240000009023 Myrrhis odorata Species 0.000 description 1
- 235000007265 Myrrhis odorata Nutrition 0.000 description 1
- 235000012550 Pimpinella anisum Nutrition 0.000 description 1
- QTBSBXVTEAMEQO-UHFFFAOYSA-N acetic acid Substances CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 125000002915 carbonyl group Chemical group [*:2]C([*:1])=O 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 238000005660 chlorination reaction Methods 0.000 description 1
- 238000010411 cooking Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- GRWZHXKQBITJKP-UHFFFAOYSA-L dithionite(2-) Chemical compound [O-]S(=O)S([O-])=O GRWZHXKQBITJKP-UHFFFAOYSA-L 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 229920001021 polysulfide Polymers 0.000 description 1
- 239000005077 polysulfide Substances 0.000 description 1
- 150000008117 polysulfides Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000011541 reaction mixture Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 238000007655 standard test method Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 238000005406 washing 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
- D21C9/1057—Multistage, with compounds cited in more than one sub-group D21C9/10, D21C9/12, D21C9/16
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Paper (AREA)
Claims (9)
1. Förfarande för blekning av kemisk massa, varvid en massa med en koncentration av 3-40 % bringas i ett första skede att reagera med syre vid en temperatur av 70-l4Q°C vid ett syretryck av 5-10 kp/cm och ι ett andra skede att reagera med en peroxiförenmg, varefter alternativt följer ett tredje skede, känneteck-n a t av att massan bringas i det första skedet att reagera med syre vid närvaro av ett skyddsämne, vars koncentration är ca 0,2-10 % räknad pä vikten av ugnstorkad massa, varvid skyddsämnet utgöres av Na2S2Oi| eller Na2Sx, väri x är ett heltal 2-4, under ca 1/2-8 timmar, alternativt vid närvaro av ca 0,5-5 % natriumhydroxid, att massan i ett andra skede bringas att reagera med 0,5-2 %, fördelaktigt 1 % perättiksyra räknat pä vikten av ugnstorkad massa, varvid pH-värdet vid begynnelsen av det andra skedet är 8-12, vid en temperatur av 50-90°C, fördelaktigt 70°C under 30-120 minuter, och vid önskan bringas massan i ett tredje skede att reagera med ca 0,25-2,0¾ klordioxid räknat pä vikten av ugnstorkad massa, vid en temperatur av 20-90°C, fördelaktigt 70°C under ca 5-120 minuter.
2. Förfarande enligt patentkravet 1, kännetecknat av att pH-värdet i början av det andra blekningssteget med perättiksyra är 8-10.
3- Förfarande enligt patentkravet 1 eller 2, där 0,5~5 % natriumhydroxid räknat pä massans vikt är närvarande vid det första skedet, kännetecknat av att skyddsämnets koncentration är 2 % eller lägre räknad pä vikten av ugnstorkad massa.
4. Förfarande enligt patentkravet 1 eller 2, kännetecknat av att skyddsämnet i det första skedet utgöres av Na2S^ och att dess koncentration är 2 % eller högre räknat pä vikten av ugnstorkad massa.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US4040470A | 1970-05-25 | 1970-05-25 | |
| US4040470 | 1970-05-25 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| FI59432B FI59432B (fi) | 1981-04-30 |
| FI59432C true FI59432C (fi) | 1981-08-10 |
Family
ID=21910799
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FI1406/71A FI59432C (fi) | 1970-05-25 | 1971-05-21 | Foerfarande foer blekning av kemiska massor |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US3695995A (sv) |
| JP (1) | JPS5510714B1 (sv) |
| CA (1) | CA939855A (sv) |
| DE (1) | DE2124325C3 (sv) |
| FI (1) | FI59432C (sv) |
| FR (1) | FR2095038A5 (sv) |
| SE (1) | SE375565C (sv) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT378016B (de) * | 1982-12-02 | 1985-06-10 | Ver Edelstahlwerke Ag | Verfahren zum entfaerben und/oder bleichen von zellulosematerial, insbesondere zellstoff, und vorrichtung zur durchfuehrung des verfahrens |
| 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 |
-
1970
- 1970-05-25 US US40404A patent/US3695995A/en not_active Expired - Lifetime
- 1970-12-11 CA CA100,406A patent/CA939855A/en not_active Expired
-
1971
- 1971-05-12 JP JP3187971A patent/JPS5510714B1/ja active Pending
- 1971-05-17 DE DE2124325A patent/DE2124325C3/de not_active Expired
- 1971-05-21 FI FI1406/71A patent/FI59432C/fi active
- 1971-05-24 SE SE7106636A patent/SE375565C/sv unknown
- 1971-05-25 FR FR7118899A patent/FR2095038A5/fr not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FI59432B (fi) | 1981-04-30 |
| SE375565B (sv) | 1975-04-21 |
| DE2124325C3 (de) | 1980-06-19 |
| US3695995A (en) | 1972-10-03 |
| DE2124325B2 (de) | 1979-09-27 |
| JPS5510714B1 (sv) | 1980-03-18 |
| DE2124325A1 (de) | 1971-12-09 |
| FR2095038A5 (sv) | 1972-02-04 |
| CA939855A (en) | 1974-01-15 |
| SE375565C (sv) | 1984-07-16 |
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