CA2533535A1 - Multi-stage ap mechanical pulping with refiner blow line treatment - Google Patents
Multi-stage ap mechanical pulping with refiner blow line treatment Download PDFInfo
- Publication number
- CA2533535A1 CA2533535A1 CA002533535A CA2533535A CA2533535A1 CA 2533535 A1 CA2533535 A1 CA 2533535A1 CA 002533535 A CA002533535 A CA 002533535A CA 2533535 A CA2533535 A CA 2533535A CA 2533535 A1 CA2533535 A1 CA 2533535A1
- Authority
- CA
- Canada
- Prior art keywords
- intermediate line
- solution
- alkaline peroxide
- lignocellulosic material
- pulping process
- 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
- 238000004537 pulping Methods 0.000 title claims 44
- 150000002978 peroxides Chemical class 0.000 claims abstract 84
- 238000007670 refining Methods 0.000 claims abstract 13
- 239000000463 material Substances 0.000 claims abstract 10
- 239000000126 substance Substances 0.000 claims abstract 6
- 239000012978 lignocellulosic material Substances 0.000 claims 48
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 claims 46
- 238000000034 method Methods 0.000 claims 43
- 238000005470 impregnation Methods 0.000 claims 27
- 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 claims 26
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims 24
- 229910052943 magnesium sulfate Inorganic materials 0.000 claims 23
- 235000019341 magnesium sulphate Nutrition 0.000 claims 23
- 238000007599 discharging Methods 0.000 claims 22
- 230000014759 maintenance of location Effects 0.000 claims 11
- 239000011541 reaction mixture Substances 0.000 claims 8
- 230000035484 reaction time Effects 0.000 claims 7
- 238000003825 pressing Methods 0.000 claims 6
- 239000000203 mixture Substances 0.000 claims 5
- 239000003513 alkali Substances 0.000 claims 4
- 239000003381 stabilizer Substances 0.000 claims 4
- 238000004061 bleaching Methods 0.000 claims 2
- 230000000717 retained effect Effects 0.000 claims 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 abstract 1
- 238000002203 pretreatment Methods 0.000 abstract 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
- D21C9/163—Bleaching ; Apparatus therefor with per compounds with peroxides
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
- D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
- D21B1/14—Disintegrating in mills
- D21B1/16—Disintegrating in mills in the presence of chemical agents
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Paper (AREA)
Abstract
The invention combines the step of adding chemicals such as alkaline peroxide to an intermediate line after refining, with the step of applying chemicals such as alkaline peroxide as a pre-treatment before primary refining and/or applying chemicals such as alkaline peroxide at the primary refiner. This is implemented tin the preferred embodiment, by material, refining the material into a pulp in a superatmospheric refiner, and adding chemicals in the post refining blowline.
Claims (43)
1. An alkaline peroxide mechanical pulping process comprising the steps of:
feeding a lignocellulosic material into a first press;
pressing the lignocellulosic material;
discharging the lignocellulosic material from the first press;
impregnating the lignocellulosic material discharged from the first press with a first alkaline peroxide pretreatment solution and maintaining the impregnation for a first reaction time;
feeding the impregnated lignocellulosic material to a refiner having an inlet and a rotating disc within a superatmospheric casing;
refining the impregnated lignocellulosic material to form a primary pulp having a temperature of at least about 80C;
delivering a stream of primary pulp from the superatmospheric casing to an intermediate line while the primary pulp temperature is at least about 80C;
adding an alkaline peroxide intermediate line solution to the stream of primary pulp within the intermediate line while the primary pulp temperature is at least about 80C;
mixing the intermediate line solution and the stream of primary pulp to form a reaction mixture in the intermediate line;
discharging the reaction mixture having a temperature of at least about 80C into a retention vessel;
retaining the reaction mixture in the retention vessel to produce a bleached material.
feeding a lignocellulosic material into a first press;
pressing the lignocellulosic material;
discharging the lignocellulosic material from the first press;
impregnating the lignocellulosic material discharged from the first press with a first alkaline peroxide pretreatment solution and maintaining the impregnation for a first reaction time;
feeding the impregnated lignocellulosic material to a refiner having an inlet and a rotating disc within a superatmospheric casing;
refining the impregnated lignocellulosic material to form a primary pulp having a temperature of at least about 80C;
delivering a stream of primary pulp from the superatmospheric casing to an intermediate line while the primary pulp temperature is at least about 80C;
adding an alkaline peroxide intermediate line solution to the stream of primary pulp within the intermediate line while the primary pulp temperature is at least about 80C;
mixing the intermediate line solution and the stream of primary pulp to form a reaction mixture in the intermediate line;
discharging the reaction mixture having a temperature of at least about 80C into a retention vessel;
retaining the reaction mixture in the retention vessel to produce a bleached material.
2. The alkaline peroxide mechanical pulping process of claim 1 further comprising;
feeding the lignocellulosic material that has been impregnated with the first pretreatment solution for a first reaction time, into a second press;
pressing and discharging the lignocellulosic material from the second press;
impregnating the lignocellulosic material discharged from the second press with a second alkaline peroxide pretreatment solution and maintaining the second impregnation for a second reaction time.
feeding the lignocellulosic material that has been impregnated with the first pretreatment solution for a first reaction time, into a second press;
pressing and discharging the lignocellulosic material from the second press;
impregnating the lignocellulosic material discharged from the second press with a second alkaline peroxide pretreatment solution and maintaining the second impregnation for a second reaction time.
3. The alkaline peroxide mechanical pulping process of claim 1 further comprising adding an alkaline peroxide refiner solution to the lignocellulosic material at the refiner.
4. The alkaline peroxide mechanical pulping process of claim 1, wherein the step of feeding the impregnated lignocellulosic material to a refiner having an inlet and a rotating disc within a superatmospheric casing includes maintaining the superatmospheric casing at a pressure of at least about 240kPa.
5. The alkaline peroxide mechanical pulping process of claim 1, wherein the step of mixing is immediately followed by introducing the mixture into a separator and the separated pulp is then discharged into said retention vessel.
6. The alkaline peroxide mechanical pulping process of claim 1, wherein the step of adding an alkaline peroxide intermediate line solution to the stream of primary pulp within the intermediate line includes adding the intermediate line solution immediately after a blow valve.
7. The alkaline peroxide mechanical pulping process of claim 5, wherein the step of adding an alkaline peroxide intermediate line solution to the stream of primary pulp within the intermediate line includes adding the intermediate line solution immediately prior to the separator.
8. ~The alkaline peroxide mechanical pulping process of claim 1, wherein the step of delivering a stream of primary pulp from the superatmospheric casing to a intermediate line further includes the primary pulp having a temperature in the range of about 90C to about 155C and a consistency of about 20 to about 60%.
9. The alkaline peroxide mechanical pulping process of claim 1, wherein the reaction mixture is retained in the retention vessel at a temperature of about 60C to about 95C and a consistency of about 20%
to about 40%.
to about 40%.
10. The alkaline peroxide mechanical pulping process of claim 1, wherein the reaction mixture is retained in the retention vessel at a temperature of about 85C to about 95C, and a consistency of about 30%.
11. The alkaline peroxide mechanical pulping process of claim 1, wherein the impregnation solution contains alkali, peroxide, and stabilizer; the intermediate line solution contains alkali, peroxide, and stabilizer; and said intermediate line solution has a temperature less than about 80C.
12. The alkaline peroxide mechanical pulping process of claim 2, wherein the first impregnation solution contains 0.3% DTPA; the second impregnation solution contains 0.2% MgSO4, 4.4% silicate, 2.8% TA, and 2.8%H2O2; and the intermediate line solution contains 0.16% DTPA, 0.16% MgSO, 2.3% silicate, 1.8% TA with 0.5% being residual, 2.4%
H2O2 with 1.1 % being residual.
H2O2 with 1.1 % being residual.
13. The alkaline peroxide mechanical pulping process of claim 2, wherein the first impregnation solution contains 0.5% DTPA; the second impregnation solution contains 0.2% DTPA, 0.1 % MgSO4, 2.0% silicate, 1.6% TA, and 2.6%H2O2; and the intermediate line solution contains 0.13% DTPA, 0.13% MgSO4, 2.5% silicate, 1.2% TA with 0.1 % being residual, 2.1 % H2O2 with 2.1 % being residual.
14. The alkaline peroxide mechanical pulping process of claim 2, wherein the first impregnation solution contains 0.3% DTPA, 0.05%
MgSO4, 0.7% silicate, 0.2% TA, and 0.5%H2O2; the second impregnation solution contains 0.1 % DTPA, 0.08% MgSO4, 1.8% silicate, 1.4% TA, and 1.9%H2O2; and the intermediate line solution contains 0.22% DTPA, 0.11% MgSO4, 1.1 % silicate, 0.9% TA with 0.2% being residual, 1.2% H2O2 with 1.7% being residual.
MgSO4, 0.7% silicate, 0.2% TA, and 0.5%H2O2; the second impregnation solution contains 0.1 % DTPA, 0.08% MgSO4, 1.8% silicate, 1.4% TA, and 1.9%H2O2; and the intermediate line solution contains 0.22% DTPA, 0.11% MgSO4, 1.1 % silicate, 0.9% TA with 0.2% being residual, 1.2% H2O2 with 1.7% being residual.
15. The alkaline peroxide mechanical pulping process of claim 2, wherein the first impregnation solution contains 0.4% TA, 0.5%
H2O2,0.2% DTPA, 0.04% MgSO4, 0.5% silicate; the second impregnation solution contains 0.14% DTPA, 0.05% MgSO4, 0.5%
silicate, 0.4% TA, and 0.6%H2O2; and the intermediate line solution contains 0.18% DTPA, 0.06% MgSO4, 1.8% silicate, 1.2% TA with 0.1%
being residual, 1.8% H2O2 with 1.1 % being residual.
H2O2,0.2% DTPA, 0.04% MgSO4, 0.5% silicate; the second impregnation solution contains 0.14% DTPA, 0.05% MgSO4, 0.5%
silicate, 0.4% TA, and 0.6%H2O2; and the intermediate line solution contains 0.18% DTPA, 0.06% MgSO4, 1.8% silicate, 1.2% TA with 0.1%
being residual, 1.8% H2O2 with 1.1 % being residual.
16. The alkaline peroxide mechanical pulping process of claim 2, wherein the first impregnation solution contains 0.4% TA, 0.6%
H2O2,0.18% DTPA, 0.03% MgSO4, 0.3% silicate; the second impregnation solution contains 0.15% DTPA, 0.05% MgSO4, 0.4%
silicate, 0.4% TA, and 0.7%H2O2; and the intermediate line solution contains 1.7% TA, and 2.8% H2O2 with 1.1 % being residual.
H2O2,0.18% DTPA, 0.03% MgSO4, 0.3% silicate; the second impregnation solution contains 0.15% DTPA, 0.05% MgSO4, 0.4%
silicate, 0.4% TA, and 0.7%H2O2; and the intermediate line solution contains 1.7% TA, and 2.8% H2O2 with 1.1 % being residual.
17. A chemimechanical pulping process comprising the steps of:
feeding a lignocellulosic material into a first press;
pressing the lignocellulosic material;
discharging the lignocellulosic material from the first press;
impregnating the lignocellulosic material discharged from the first press with a first chemical bleaching pretreatment solution and maintaining the impregnation for a first reaction time;
feeding the lignocellulosic material impregnated with the first pretreatment solution to a refiner having an inlet and a rotating disc within a superatmospheric casing;
refining the lignocellulosic material to form a primary pulp having a temperature of at least 80C;
while the primary pulp temperature is at least about 80C, discharging the primary pulp from the casing to an intermediate line;
while the primary pulp temperature is at least about 80C, adding an alkaline peroxide intermediate line solution at the intermediate line which contains the primary pulp;
mixing the intermediate line solution with the primary pulp;
while the intermediate line solution and primary pulp mixture are at a temperature of at least about 80C discharging the intermediate line solution and primary pulp mixture into a retention tower;
retaining the mixture in the retention tower; and processing the primary pulp further to a secondary pulp.
feeding a lignocellulosic material into a first press;
pressing the lignocellulosic material;
discharging the lignocellulosic material from the first press;
impregnating the lignocellulosic material discharged from the first press with a first chemical bleaching pretreatment solution and maintaining the impregnation for a first reaction time;
feeding the lignocellulosic material impregnated with the first pretreatment solution to a refiner having an inlet and a rotating disc within a superatmospheric casing;
refining the lignocellulosic material to form a primary pulp having a temperature of at least 80C;
while the primary pulp temperature is at least about 80C, discharging the primary pulp from the casing to an intermediate line;
while the primary pulp temperature is at least about 80C, adding an alkaline peroxide intermediate line solution at the intermediate line which contains the primary pulp;
mixing the intermediate line solution with the primary pulp;
while the intermediate line solution and primary pulp mixture are at a temperature of at least about 80C discharging the intermediate line solution and primary pulp mixture into a retention tower;
retaining the mixture in the retention tower; and processing the primary pulp further to a secondary pulp.
18. An alkaline peroxide mechanical pulping process comprising the steps of:
in a primary refiner having a superatmoshperic casing, refining a lignocellulosic material that has been pretreated and impregnated with at least a first alkaline peroxide pretreatment solution;
discharging the lignocellulosic material at temperature of at least about 80C into intermediate line having at least one solution inlet port;
injecting an alkaline peroxide intermediate line solution through the at least one solution inlet port;
mixing the intermediate line solution and the lignocellulosic material in the intermediate line;
discharging the lignocellulosic material from the intermediate line at a temperature of at least about 80C; and maintaining the discharged lignocellulosic material for a reaction period.
in a primary refiner having a superatmoshperic casing, refining a lignocellulosic material that has been pretreated and impregnated with at least a first alkaline peroxide pretreatment solution;
discharging the lignocellulosic material at temperature of at least about 80C into intermediate line having at least one solution inlet port;
injecting an alkaline peroxide intermediate line solution through the at least one solution inlet port;
mixing the intermediate line solution and the lignocellulosic material in the intermediate line;
discharging the lignocellulosic material from the intermediate line at a temperature of at least about 80C; and maintaining the discharged lignocellulosic material for a reaction period.
19. The alkaline peroxide mechanical pulping process of claim 18, wherein the step of refining further includes adding a refiner solution of alkaline peroxide at the primary refiner.
20. The alkaline peroxide mechanical pulping process of claim 18, wherein the step of injecting an alkaline peroxide intermediate line solution through the at least one solution inlet port and into the intermediate line containing the lignocellulosic material includes injecting an alkaline peroxide intermediate line solution through, at least, one solution inlet port located immediately after the blow valve.
21. An alkaline peroxide mechanical pulping process comprising the steps of:
feeding a lignocellulosic material into a first press;
pressing the lignocellulosic material;
discharging the lignocellulosic material from the first press;
impregnating the lignocellulosic material discharged from the first press with a first alkaline peroxide pretreatment solution and maintaining the impregnation for a first reaction time;
feeding the impregnated lignocellulosic material to a refiner having an inlet and a rotating disc within a superatmospheric casing;
refining the impregnated lignocellulosic material to form a primary pulp;
discharging the stream of primary pulp from the superatmospheric casing to an intermediate line;
adding an alkaline peroxide intermediate line solution to the stream of primary pulp within the intermediate line;
mixing the intermediate line solution and the stream of primary pulp to form a reaction mixture;
discharging the reaction mixture into a retention vessel;
retaining the reaction mixture in the retention vessel to produce a bleached material.
feeding a lignocellulosic material into a first press;
pressing the lignocellulosic material;
discharging the lignocellulosic material from the first press;
impregnating the lignocellulosic material discharged from the first press with a first alkaline peroxide pretreatment solution and maintaining the impregnation for a first reaction time;
feeding the impregnated lignocellulosic material to a refiner having an inlet and a rotating disc within a superatmospheric casing;
refining the impregnated lignocellulosic material to form a primary pulp;
discharging the stream of primary pulp from the superatmospheric casing to an intermediate line;
adding an alkaline peroxide intermediate line solution to the stream of primary pulp within the intermediate line;
mixing the intermediate line solution and the stream of primary pulp to form a reaction mixture;
discharging the reaction mixture into a retention vessel;
retaining the reaction mixture in the retention vessel to produce a bleached material.
22. The alkaline peroxide mechanical pulping process of claim 21, further comprising;
feeding the lignocellulosic material that has been impregnated with the first pretreatment solution for a first reaction time, into a second press;
pressing and discharging the lignocellulosic material from the second press;
impregnating the lignocellulosic material discharged from the second press with a second alkaline peroxide pretreatment solution and maintaining the second impregnation for a second reaction time.
feeding the lignocellulosic material that has been impregnated with the first pretreatment solution for a first reaction time, into a second press;
pressing and discharging the lignocellulosic material from the second press;
impregnating the lignocellulosic material discharged from the second press with a second alkaline peroxide pretreatment solution and maintaining the second impregnation for a second reaction time.
23. The alkaline peroxide mechanical pulping process of claim 21 further comprising adding an alkaline peroxide refiner solution to the lignocellulosic material at the refiner.
24. The alkaline peroxide mechanical pulping process of claim 21, wherein the step of discharging the stream of primary pulp from the superatmospheric casing to an intermediate line includes the intermediate line having a blow valve and adding the alkaline intermediate line solution immediately after the blow valve.
25. The alkaline peroxide mechanical pulping process of claim 21, wherein discharging the stream of primary pulp from the superatmospheric casing includes the intermediate line having a blow valve followed by a separator and the step of adding an alkaline peroxide intermediate line solution to the stream of primary pulp within the intermediate line includes adding the alkaline peroxide intermediate line solution immediately prior to the separator.
26. The alkaline peroxide mechanical pulping process of claim 21, wherein discharging the stream of primary pulp from the superatmospheric casing includes the intermediate line having a blow valve followed by a separator and the step of adding an alkaline peroxide intermediate line solution to the stream of primary pulp within the intermediate line includes adding the alkaline peroxide intermediate line solution at the separator.
27. The alkaline peroxide mechanical pulping process of claim 24, wherein discharging the stream of primary pulp from the superatmospheric casing includes the intermediate line having a blow valve followed by a separator and the step of adding an alkaline peroxide intermediate line solution to the stream of primary pulp within the intermediate line includes adding the alkaline peroxide intermediate line solution immediately after the separator.
28. The alkaline peroxide mechanical pulping process of claim 21, wherein the step of feeding the impregnated lignocellulosic material to a refiner having an inlet and a rotating disc within a superatmospheric casing includes maintaining the superatmospheric casing at a pressure of at least about 240kPa.
29. The alkaline peroxide mechanical pulping process of claim 21, wherein the impregnation solution contains alkali, peroxide, and stabilizer; the intermediate line solution contains alkali, peroxide and stabilizer; and said intermediate line solution is at a temperature less than the stream of primary pulp.
30. The alkaline peroxide mechanical pulping process of claim 22, wherein the first impregnation solution contains 0.3% DTPA; the second impregnation solution contains 0.2% MgSO4, 4.4% silicate, 2.8% TA, and 2.8%H2O2; and the intermediate line solution contains 0.16% DTPA, 0.16% MgSO4, 2.3% silicate, 1.8% TA with 0.5% being residual, 2.4%
H2O2 with 1.1% being residual.
H2O2 with 1.1% being residual.
31. The alkaline peroxide mechanical pulping process of claim 22, wherein the first impregnation solution contains 0.5% DTPA; the second impregnation solution contains 0.2% DTPA, 0.1% MgSO4, 2.0% silicate, 1.6% TA, and 2.6%H2O2; and the intermediate line solution contains O.13% DTPA, 0.13% MgSO4, 2.5% silicate, 1.2% TA with 0.1% being residual, 2.1% H2O2 with 2.1% being residual.
32. The alkaline peroxide mechanical pulping process of claim 22, wherein the first impregnation solution contains 0.3% DTPA, 0.05%
MgSO4, 0.7% silicate, 0.2% TA, and 0.5%H2O2; the second impregnation solution contains 0.1 % DTPA, 0.08% MgSO4, 1.8% silicate, 1.4% TA, and 1.9%H2O2; and the intermediate line solution contains 0.22% DTPA, 0.11 % MgSO4, 1.1 % silicate, 0.9% TA with 0.2% being residual, 1.2% H2O2 with 1.7% being residual.
MgSO4, 0.7% silicate, 0.2% TA, and 0.5%H2O2; the second impregnation solution contains 0.1 % DTPA, 0.08% MgSO4, 1.8% silicate, 1.4% TA, and 1.9%H2O2; and the intermediate line solution contains 0.22% DTPA, 0.11 % MgSO4, 1.1 % silicate, 0.9% TA with 0.2% being residual, 1.2% H2O2 with 1.7% being residual.
33. The alkaline peroxide mechanical pulping process of claim 22, wherein the first impregnation solution contains 0.4% TA, 0.5%
H2O2,0.2% DTPA, 0.04% MgSO4, 0.5% silicate; the second impregnation solution contains 0.14% DTPA, 0.05% MgSO4, 0.5%
silicate, 0.4% TA, and 0.6%H2O2; and the intermediate line solution contains 0.18% DTPA, 0.06% MgSO4, 1.8% silicate, 1.2% TA with 0.1%
being residual, 1.8% H2O2 with 1.1 % being residual.
H2O2,0.2% DTPA, 0.04% MgSO4, 0.5% silicate; the second impregnation solution contains 0.14% DTPA, 0.05% MgSO4, 0.5%
silicate, 0.4% TA, and 0.6%H2O2; and the intermediate line solution contains 0.18% DTPA, 0.06% MgSO4, 1.8% silicate, 1.2% TA with 0.1%
being residual, 1.8% H2O2 with 1.1 % being residual.
34. The alkaline peroxide mechanical pulping process of claim 22, wherein the first impregnation solution contains 0.4% TA, 0.6%
H2O2,0.18% DTPA, 0.03% MgSO4, 0.3% silicate; the second impregnation solution contains 0.15% DTPA, 0.05% MgSO4, 0.4%
silicate, 0.4% TA, and 0.7%H2O2; and the intermediate line solution contains 1.7% TA, and 2.8% H2O2 with 1.1 % being residual.
H2O2,0.18% DTPA, 0.03% MgSO4, 0.3% silicate; the second impregnation solution contains 0.15% DTPA, 0.05% MgSO4, 0.4%
silicate, 0.4% TA, and 0.7%H2O2; and the intermediate line solution contains 1.7% TA, and 2.8% H2O2 with 1.1 % being residual.
35. A chemimechanical pulping process comprising the steps of:
feeding a lignocellulosic material into a press;
pressing the lignocellulosic material;
discharging the lignocellulosic material from the press;
impregnating the lignocellulosic material discharged from the press with a chemical bleaching pretreatment solution;
feeding the lignocellulosic material impregnated with the pretreatment solution to a refiner having an inlet and a rotating disc within a superatmospheric casing;
refining the lignocellulosic material to form a primary pulp;
discharging the primary pulp from the casing through an intermediate line;
adding an alkaline peroxide solution at the intermediate line to the primary pulp;
mixing the intermediate line solution with the primary pulp;
delivering the intermediate line solution and primary pulp mixture to a retention tower;
processing the primary pulp from the retention tower, into a secondary pulp.
feeding a lignocellulosic material into a press;
pressing the lignocellulosic material;
discharging the lignocellulosic material from the press;
impregnating the lignocellulosic material discharged from the press with a chemical bleaching pretreatment solution;
feeding the lignocellulosic material impregnated with the pretreatment solution to a refiner having an inlet and a rotating disc within a superatmospheric casing;
refining the lignocellulosic material to form a primary pulp;
discharging the primary pulp from the casing through an intermediate line;
adding an alkaline peroxide solution at the intermediate line to the primary pulp;
mixing the intermediate line solution with the primary pulp;
delivering the intermediate line solution and primary pulp mixture to a retention tower;
processing the primary pulp from the retention tower, into a secondary pulp.
36. An alkaline peroxide mechanical pulping process comprising the steps of:
in a primary refiner having a superatmoshperic casing, refining a lignocellulosic material that has been pretreated and impregnated with at least a first alkaline peroxide pretreatment solution;
discharging the lignocellulosic material into an intermediate line having at least one solution inlet port;
injecting an alkaline peroxide intermediate line solution through the at least one solution inlet port;
mixing the intermediate line solution and the lignocellulosic.
material;
discharging the lignocellulosic material from the intermediate line;
and retaining the discharged lignocellulosic material for a reaction period.
in a primary refiner having a superatmoshperic casing, refining a lignocellulosic material that has been pretreated and impregnated with at least a first alkaline peroxide pretreatment solution;
discharging the lignocellulosic material into an intermediate line having at least one solution inlet port;
injecting an alkaline peroxide intermediate line solution through the at least one solution inlet port;
mixing the intermediate line solution and the lignocellulosic.
material;
discharging the lignocellulosic material from the intermediate line;
and retaining the discharged lignocellulosic material for a reaction period.
37. The alkaline peroxide mechanical pulping process of claim 36, wherein the step of refining further includes adding a refiner solution of alkaline peroxide at the primary refiner.
38. The alkaline peroxide mechanical pulping process of claim 36, wherein the step of injecting an alkaline peroxide intermediate line solution through the, at least one, solution inlet port and into the intermediate line containing the lignocellulosic material includes injecting an alkaline peroxide intermediate line solution through, at least, one solution inlet port located immediately after a blow valve.
39. The alkaline peroxide mechanical pulping process of claim 36, wherein the step of injecting an alkaline peroxide intermediate line solution through the, at least one, solution inlet port and into the intermediate line containing the lignocellulosic material includes injecting an alkaline peroxide intermediate line solution through, at least, one solution inlet port located immediately prior to a separator.
40. The alkaline peroxide mechanical pulping process of claim 36, wherein the step of injecting an alkaline peroxide intermediate line solution through the, at least one, solution inlet port and into the intermediate line containing the lignocellulosic material includes injecting an alkaline peroxide intermediate line solution through, at least, one solution inlet port located at a separator.
41. The alkaline peroxide mechanical pulping process of claim 36, wherein the step of injecting an alkaline peroxide intermediate line solution through the, at least one, solution inlet port and into the intermediate line containing the lignocellulosic material includes injecting an alkaline peroxide intermediate line solution through, at least, one solution inlet port located at a discharge portion of a separator.
42. An alkaline peroxide mechanical pulping process comprises the steps of:
in a refiner having a casing, additionally refining a lignocellulosic based material that has been previously pretreated and impregnated with at least a first alkaline peroxide pretreatment solution and which has been previously refined;
discharging the lignocellulosic based material into an intermediate line having at least one solution inlet port;
injecting an alkaline peroxide intermediate line solution through the at least one solution port;
mixing the intermediate line solution and the lignocellulosic based material;
discharging the lignocellulosic based material from the intermediate line; and retaining the discharged lignocellusic based material for a reaction period.
in a refiner having a casing, additionally refining a lignocellulosic based material that has been previously pretreated and impregnated with at least a first alkaline peroxide pretreatment solution and which has been previously refined;
discharging the lignocellulosic based material into an intermediate line having at least one solution inlet port;
injecting an alkaline peroxide intermediate line solution through the at least one solution port;
mixing the intermediate line solution and the lignocellulosic based material;
discharging the lignocellulosic based material from the intermediate line; and retaining the discharged lignocellusic based material for a reaction period.
43. The alkaline peroxide mechanical pulping process of claim 42, wherein the refiner casing is superatmospheric.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/US2003/031341 WO2005042830A1 (en) | 2003-10-02 | 2003-10-02 | Multi-stage ap mechanical pulping with refiner flow line treatment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2533535A1 true CA2533535A1 (en) | 2005-05-12 |
| CA2533535C CA2533535C (en) | 2012-01-03 |
Family
ID=34548798
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2533535A Expired - Lifetime CA2533535C (en) | 2003-10-02 | 2003-10-02 | Multi-stage ap mechanical pulping with refiner blow line treatment |
Country Status (8)
| Country | Link |
|---|---|
| JP (1) | JP4580343B2 (en) |
| CN (1) | CN1839227B (en) |
| AU (1) | AU2003279120A1 (en) |
| BR (1) | BR0318520A (en) |
| CA (1) | CA2533535C (en) |
| FI (1) | FI20060305A (en) |
| SE (2) | SE0950616L (en) |
| WO (1) | WO2005042830A1 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003008703A1 (en) | 2001-07-19 | 2003-01-30 | Andritz Inc. | Four stage alkaline peroxide mechanical pulping |
| US20040200586A1 (en) * | 2002-07-19 | 2004-10-14 | Martin Herkel | Four stage alkaline peroxide mechanical pulping |
| US8262851B2 (en) | 2006-08-10 | 2012-09-11 | Andritz Inc. | Processes and systems for the pulping of lignocellulosic materials |
| US8282773B2 (en) * | 2007-12-14 | 2012-10-09 | Andritz Inc. | Method and system to enhance fiber development by addition of treatment agent during mechanical pulping |
| US8734611B2 (en) * | 2008-03-12 | 2014-05-27 | Andritz Inc. | Medium consistency refining method of pulp and system |
| CN102011334B (en) * | 2010-11-11 | 2013-04-10 | 梁锋 | Method for pulping and making paper by using eucalyptus bark |
| AU2021374948A1 (en) * | 2020-11-06 | 2023-06-29 | Kimberly-Clark Worldwide, Inc. | Dispersible non-wood pulp |
| AU2021376216A1 (en) * | 2020-11-06 | 2023-06-22 | Kimberly-Clark Worldwide, Inc. | High brightness non-wood pulp |
Family Cites Families (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE413684C (en) * | 1974-09-23 | 1987-05-07 | Mo Och Domsjoe Ab | PROCEDURE FOR PREPARING CELLULOSAMASSA IN THE REPLACEMENT AREA 65-95% |
| FI61215B (en) * | 1976-11-23 | 1982-02-26 | Defibrator Ab | SAFETY RANGE OF CONTAINER FRAMSTAELLA LIGNOCELLULOSAHALTIGA FIBERMATERIAL |
| CA1074606A (en) * | 1977-06-08 | 1980-04-01 | Llewellyn E. Clark | Method and apparatus for thermo-mechanical pulping |
| SE436368B (en) * | 1979-01-12 | 1984-12-03 | Sunds Defibrator | METHODS OF MANUFACTURING BLEACHED, MECHANICAL, CHEMICAL MECHANICAL AND SEMI-CHEMICAL MASSES OF LIGNOCELLULOSE FIBER MATERIALS |
| JPS5685488A (en) * | 1979-12-17 | 1981-07-11 | Mitsubishi Gas Chemical Co | Hydrogen peroxide refiner bleaching method of pulp |
| JPS5725492A (en) * | 1980-07-16 | 1982-02-10 | Mitsubishi Gas Chemical Co | Hydrogen peroxide refiner bleaching of high yield pulp |
| SE8501246L (en) * | 1985-03-13 | 1986-09-14 | Eka Ab | SET TO MANUFACTURE IN BLEACH, CHEMICAL MECHANICAL AND SEMI-CHEMICAL FIBER MASS USING ONE-STEP IMAGRATION |
| US4718980A (en) * | 1985-12-30 | 1988-01-12 | Weyerhaeuser Company | Interstage treatment of mechanical pulp |
| FR2613388B1 (en) * | 1987-04-02 | 1990-05-04 | Atochem | PROCESS FOR BLEACHING PASTA |
| SE9402101L (en) * | 1994-06-15 | 1995-12-16 | Moelnlycke Ab | Light dewatering, bulky, chemical-mechanical pulp with low tip and fine material content |
| FI113552B (en) * | 1999-12-09 | 2004-05-14 | Upm Kymmene Corp | Process for producing printing paper |
| JP2002294574A (en) * | 2001-03-30 | 2002-10-09 | Nippon Paper Industries Co Ltd | Method for bulky pulp production |
| US6743332B2 (en) * | 2001-05-16 | 2004-06-01 | Weyerhaeuser Company | High temperature peroxide bleaching of mechanical pulps |
| WO2003008703A1 (en) * | 2001-07-19 | 2003-01-30 | Andritz Inc. | Four stage alkaline peroxide mechanical pulping |
| JP4814448B2 (en) * | 2001-08-06 | 2011-11-16 | 日本製紙株式会社 | Coated paper for printing |
-
2003
- 2003-10-02 SE SE0950616A patent/SE0950616L/en not_active Application Discontinuation
- 2003-10-02 CN CN2003801104737A patent/CN1839227B/en not_active Ceased
- 2003-10-02 WO PCT/US2003/031341 patent/WO2005042830A1/en active Application Filing
- 2003-10-02 JP JP2005510190A patent/JP4580343B2/en not_active Expired - Fee Related
- 2003-10-02 CA CA2533535A patent/CA2533535C/en not_active Expired - Lifetime
- 2003-10-02 BR BRPI0318520-6A patent/BR0318520A/en active Search and Examination
- 2003-10-02 AU AU2003279120A patent/AU2003279120A1/en not_active Abandoned
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2006
- 2006-03-30 FI FI20060305A patent/FI20060305A/en not_active IP Right Cessation
- 2006-03-31 SE SE0600722A patent/SE532130C2/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| SE0950616L (en) | 2009-08-27 |
| CN1839227B (en) | 2011-08-17 |
| CN1839227A (en) | 2006-09-27 |
| JP2007521404A (en) | 2007-08-02 |
| JP4580343B2 (en) | 2010-11-10 |
| BR0318520A (en) | 2006-09-12 |
| CA2533535C (en) | 2012-01-03 |
| FI20060305A (en) | 2006-03-30 |
| SE532130C2 (en) | 2009-10-27 |
| AU2003279120A1 (en) | 2005-05-19 |
| WO2005042830A1 (en) | 2005-05-12 |
| SE0600722L (en) | 2006-03-31 |
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