CA1057906A - Method for automatic control of the dosageing of two chemicals - Google Patents
Method for automatic control of the dosageing of two chemicalsInfo
- Publication number
- CA1057906A CA1057906A CA229,324A CA229324A CA1057906A CA 1057906 A CA1057906 A CA 1057906A CA 229324 A CA229324 A CA 229324A CA 1057906 A CA1057906 A CA 1057906A
- Authority
- CA
- Canada
- Prior art keywords
- pulp
- chlorine
- stage
- chlorination
- chlorine dioxide
- 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
- 238000000034 method Methods 0.000 title claims abstract description 38
- 239000000126 substance Substances 0.000 title description 4
- OSVXSBDYLRYLIG-UHFFFAOYSA-N dioxidochlorine(.) Chemical compound O=Cl=O OSVXSBDYLRYLIG-UHFFFAOYSA-N 0.000 claims abstract description 73
- 238000005660 chlorination reaction Methods 0.000 claims abstract description 47
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims abstract description 45
- 239000000460 chlorine Substances 0.000 claims abstract description 45
- 229910052801 chlorine Inorganic materials 0.000 claims abstract description 45
- 239000004155 Chlorine dioxide Substances 0.000 claims abstract description 37
- 235000019398 chlorine dioxide Nutrition 0.000 claims abstract description 36
- 230000008569 process Effects 0.000 claims abstract description 21
- 239000003513 alkali Substances 0.000 claims abstract description 15
- 238000005406 washing Methods 0.000 claims abstract description 8
- 238000004076 pulp bleaching Methods 0.000 claims abstract description 4
- 238000011005 laboratory method Methods 0.000 claims abstract description 3
- 235000019589 hardness Nutrition 0.000 claims description 12
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 238000004364 calculation method Methods 0.000 claims description 5
- 238000005259 measurement Methods 0.000 description 12
- 238000006243 chemical reaction Methods 0.000 description 5
- 239000013256 coordination polymer Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 229920002678 cellulose Polymers 0.000 description 2
- 239000001913 cellulose Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 230000036632 reaction speed Effects 0.000 description 2
- 241000861718 Chloris <Aves> Species 0.000 description 1
- 108091028140 FREP Proteins 0.000 description 1
- 239000005708 Sodium hypochlorite Substances 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 238000004061 bleaching Methods 0.000 description 1
- 150000004035 chlorins Chemical class 0.000 description 1
- 230000002844 continuous effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 229920005610 lignin Polymers 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000013178 mathematical model Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 description 1
- 229960005076 sodium hypochlorite Drugs 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
- D21C9/1052—Controlling the process
-
- 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
- D21C9/12—Bleaching ; Apparatus therefor with halogens or halogen-containing compounds
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Paper (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI741828A FI50745C (fi) | 1974-06-14 | 1974-06-14 | Menetelmä kahden kemikaalin annostuksen automaattiseksi säätämiseksi. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1057906A true CA1057906A (en) | 1979-07-10 |
Family
ID=8506257
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA229,324A Expired CA1057906A (en) | 1974-06-14 | 1975-06-13 | Method for automatic control of the dosageing of two chemicals |
Country Status (3)
| Country | Link |
|---|---|
| CA (1) | CA1057906A (enrdf_load_html_response) |
| FI (1) | FI50745C (enrdf_load_html_response) |
| SE (1) | SE7506844L (enrdf_load_html_response) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998023810A1 (en) * | 1996-11-26 | 1998-06-04 | Sunds Defibrator Industries Ab | Method for controlling oxygen delignification of pulp |
| US6153050A (en) * | 1998-03-24 | 2000-11-28 | Noranda Forest Inc. | Method and system for controlling the addition of bleaching reagents to obtain a substantially constant percentage of pulp delignification across the first bleaching/delignifying stage |
-
1974
- 1974-06-14 FI FI741828A patent/FI50745C/fi active
-
1975
- 1975-06-13 CA CA229,324A patent/CA1057906A/en not_active Expired
- 1975-06-13 SE SE7506844A patent/SE7506844L/xx unknown
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998023810A1 (en) * | 1996-11-26 | 1998-06-04 | Sunds Defibrator Industries Ab | Method for controlling oxygen delignification of pulp |
| AU723369B2 (en) * | 1996-11-26 | 2000-08-24 | Valmet Fibertech Ab | Method for controlling oxygen delignification of pulp |
| US6238517B1 (en) | 1996-11-26 | 2001-05-29 | Valmet Fibertech Aktiebolag | Method for controlling oxygen delignification of pulp |
| CN1103833C (zh) * | 1996-11-26 | 2003-03-26 | 瑞典商顺智公司 | 控制纸浆的氧去木质作用的方法 |
| US6153050A (en) * | 1998-03-24 | 2000-11-28 | Noranda Forest Inc. | Method and system for controlling the addition of bleaching reagents to obtain a substantially constant percentage of pulp delignification across the first bleaching/delignifying stage |
Also Published As
| Publication number | Publication date |
|---|---|
| SE7506844L (sv) | 1975-12-15 |
| FI182874A7 (enrdf_load_html_response) | 1975-12-15 |
| FI50745B (enrdf_load_html_response) | 1976-03-01 |
| FI50745C (fi) | 1976-06-10 |
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