CN108625214A - A kind of paper pulp bleaching process of high whiteness paper for daily use - Google Patents
A kind of paper pulp bleaching process of high whiteness paper for daily use Download PDFInfo
- Publication number
- CN108625214A CN108625214A CN201810389474.8A CN201810389474A CN108625214A CN 108625214 A CN108625214 A CN 108625214A CN 201810389474 A CN201810389474 A CN 201810389474A CN 108625214 A CN108625214 A CN 108625214A
- Authority
- CN
- China
- Prior art keywords
- slurry
- tower
- admt
- paper
- pulp
- 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.)
- Pending
Links
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
-
- 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
- D21C9/02—Washing ; Displacing cooking or pulp-treating liquors contained in the pulp by fluids, e.g. wash water or other pulp-treating agents
-
- 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
-
- 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
- D21C9/1063—Bleaching ; Apparatus therefor with compounds not otherwise provided for, e.g. activated gases
-
- 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
- D21C9/1068—Bleaching ; Apparatus therefor with O2
-
- 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
- D21C9/14—Bleaching ; Apparatus therefor with halogens or halogen-containing compounds with ClO2 or chlorites
- D21C9/144—Bleaching ; Apparatus therefor with halogens or halogen-containing compounds with ClO2 or chlorites with ClO2/Cl2 and other bleaching agents in a multistage 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
- D21C9/16—Bleaching ; Apparatus therefor with per compounds
- D21C9/163—Bleaching ; Apparatus therefor with per compounds with peroxides
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Paper (AREA)
Abstract
The present invention relates to pulping bleaching technical fields, more particularly to a kind of paper pulp bleaching process of high whiteness paper for daily use, processing step includes two sections of delignification bleachings, for the first time washing, the ClO 2 bleaching under strong acid condition, addition bleaching boosters, hydrogen peroxide and oxygen boosting alkali density, third time washing, ClO 2 bleaching, washs and brighten enzymatic treatment the 4th time.Compared with prior art, bleached pulp whiteness prepared by the present invention is up to 87 degree or more, it will not there is a phenomenon where anti-yellow, and chemical bleaching agent Chlorine is down to 3kg/adm or less, greatly reduce cost, the bleached pulp whiteness of the present invention is high, high-quality, especially suitable for fine tissue of manufacturing paper with pulp.
Description
Technical field
The present invention relates to pulping bleaching technical fields, and in particular to a kind of paper pulp bleaching process of high whiteness paper for daily use.
Background technology
Paper for daily use is in order to increase the whiteness of paper, using the paper pulp by bleaching as raw material in pulping process.It passes
The bleaching process of system mainly uses three sections of drifts of traditional C~E containing chlorine~H (C~chlorine, E~alkali density, H~hypochlorite)
White technique, the tri-stage bleaching technique have following defect：1) tri-stage bleaching process consumes a large amount of bleaching agent (mainly titanium dioxide
The chemical reagent such as chlorine, hydrogen peroxide), not only make the cost of material of bleaching agent high, but also the contaminated wastewater generated is big, subsequent waste water
Processing cost accordingly increases, and to cause the production cost of slurrying high, production capacity is low；2) special in the waste water for largely using bleaching agent
It is not that chlorine and hypochlorite will produce such as more than 40 kinds of organic chloride (AOX) of chloroform, dioxin in bleaching process,
These noxious materials are not only carcinogenic, teratogenesis, toxicity are big but also difficult, and serious prestige is constituted to ecological environment and health
The side of body.It is existing commonly to brighten enzyme only although improving pulp brightness using enzyme is brightened as an improvement, also having in the prior art
Whiteness can be improved 1~2 degree (about 85 degree of whiteness), this requires higher fine tissue for some whiteness, if to
Improved again to 86 degree or more of high whiteness, it is necessary to by increase using ClO 2 bleaching agent dosage (at least 4kg/admt with
On) collective effect could realize, thus chemical bleaching agent dosage increases so that cost and pollution increases, and also high whiteness is difficult to
Stablize, is easy to happen anti-Huang.
Invention content
In view of the above-mentioned deficiencies in the prior art, it is an object of the present invention to provide a kind of paper pulp bleaching of high whiteness paper for daily use
Skill, the bleaching process can make pulp brightness be up to 87 degree or more, and whiteness in the case where reducing chemical bleaching agent dosage
Stablize.
To achieve the goals above, the present invention adopts the following technical scheme that：
A kind of paper pulp bleaching process of high whiteness paper for daily use, including following processing step are provided：
A, two sections of delignification bleachings：
A1) one section of delignification bleaching：
The caustic soda and 1~3kg/ for accounting for air dried pulp weight 2.0%~3.0% are added into the slurry after wash engine washing concentrating
The magnesium sulfate of admt is sent into first segment medium-consistency pulp mixer, in the first paragraph dense mixing after low-pressure steam is heated to 90~95 DEG C
20~25kg/admt oxygen mix is added in device and uniformly enters lifting/lowering streaming reaction tube afterwards, slurry is in lifting/lowering streaming reaction tube
The interior residence time is 5~10min；
A2) two sections of delignification bleachings：
The slurry come out from first segment downflow tower is sent into dense mixed in second segment after middle pressure steam is heated to 95~102 DEG C
Clutch, addition 20~25kg/admt oxygen mix is uniform in second segment medium-consistency pulp mixer, send to upflow tower, and control tower top
Pressure is 0.4~0.6MPa, and temperature is 90~100 DEG C in tower, and the paper pulp residence time is 50~70min；Then by pulp blowing out
It is taken off in blow bin to oxygen, it is spare；
B, it washs for the first time：
The slurry that step a is obtained is spare after wash engine washing concentrating；
C, the ClO 2 bleaching under strong acid condition：
Then sulfuric acid is added in dense standpipe during the slurry that step b is obtained is sent into, it is 2.0~3.0 to adjust pH value, is then used
Slurry is heated to being sent into medium-consistency pulp mixer after 75~85 DEG C by steam, then into medium-consistency pulp mixer be added 6~10kg/admt,
The ClO 2 solution of a concentration of 9.0~10.0g/l is simultaneously uniformly mixed, and then slurry enters in upflow tower, from up-flow tower top
Portion's overflow to downflow tower, slurry is 120~150min in the residence time of upflow tower and downflow tower；
D, it washs for second：
Slurry is drawn to wash engine from downflow tower and is washed, concentrates, spare；
E, bleach boosters are added：
The model AP8138 that the slurry obtained after step d washings is produced in the addition Bark Mann of wash engine stern notch
Bleach boosters stoste, control bleach boosters additive amount is 0.2~0.3kg/admt, and temperature is 75~80 DEG C, and pH value is
11.5~12.0；
F, hydrogen peroxide and oxygen boosting alkali density：
Caustic soda, hydrogen peroxide and oxygen is added in wash engine stern notch in the slurry obtained after step d washings, adjusts pH value 11.5
Medium-consistency pulp mixer is sent into after~12 to be uniformly mixed, then slurry enters in upflow tower, from upflow tower top overflow to downflow tower,
Slurry is 60~70min in the residence time of upflow tower and downflow tower, and temperature is 80~85 DEG C；
G, third time is washed：
Slurry after step e, f is sent to wash engine washing concentrating, spare；
H, ClO 2 bleaching：
Sulfuric acid is added in wash engine stern notch in the slurry obtained after step g washings, in being sent into after adjusting pH value 3.5~4.5
1~3kg/admt, the ClO 2 solution of a concentration of 9.0~10.0g/l and mixing are added into medium-consistency pulp mixer for dense mixer
Uniformly, then slurry enters in upflow tower, and from overflow at the top of upflow tower to downflow tower, slurry stops upflow tower and downflow tower
It is 250~300min to stay the time, and temperature is 80~85 DEG C；
When slurry is extracted out from bleaching action tower bottom, 0.5~2kg/admt, the thio sulphur of a concentration of 100~120g/l is added
Acid sodium solution neutralizes the residual chlorine that unreacted is complete in slurry；
I, the 4th washing：
Slurry after step h is sent to wash engine washing concentrating, spare；
J, enzymatic treatment is brightened：
The model that the slurry obtained after step i washings is produced in the addition Bark Mann of wash engine stern notch
BUZYME3500's brightens proenzyme liquid and viscosity protective agent, and it is 0.16~0.25kg/admt that enzyme additive amount is brightened in control, and viscosity is protected
The additive amount for protecting agent is 1.8~3.5kg/admt, and dense tower during then slurry is delivered to, controlled at 47~65 DEG C, pH value is
4.5~7.0, the slurry after brightening enzymatic treatment is delivered to the storage of finished pulp tower, spare.
In above-mentioned technical proposal, in the step j, the additive amount for brightening enzyme is 0.25kg/admt, and viscosity protective agent adds
Dosage is 1.8kg/admt, dense tower during then slurry is delivered to, controlled at 50 DEG C, pH value 6.0.
In above-mentioned technical proposal, in the step j, the additive amount for brightening enzyme is 0.20kg/admt, and viscosity protective agent adds
Dosage is 2.6kg/admt, dense tower during then slurry is delivered to, controlled at 58 DEG C, pH value 5.0.
In above-mentioned technical proposal, in the step j, the additive amount for brightening enzyme is 0.16kg/admt, and viscosity protective agent adds
Dosage is 3.5kg/admt, dense tower during then slurry is delivered to, controlled at 62 DEG C, pH value 5.5.
In above-mentioned technical proposal, the viscosity protective agent is at least one in mannitol, sodium gluconate or odium stearate
Kind.
In above-mentioned technical proposal, in the step e, bleach boosters additive amount is 0.25kg/admt, and temperature is 78 DEG C,
PH value is 11.8.
The beneficial effects of the invention are as follows：
A kind of paper pulp bleaching process of high whiteness paper for daily use of the present invention passes through two sections of delignification bleachings, first successively
Secondary washing, the ClO 2 bleaching under strong acid condition, second of washing, addition bleaching boosters, hydrogen peroxide and oxygen boosting
Alkali density, third time washing, ClO 2 bleaching, the 4th time wash and enzymatic treatment bleaching process.Compared with prior art, have
It has the advantage that：
(1) present invention determines use on the basis of traditional CEH tri-stage bleaching techniques by lot of experiments
The enzyme that brightens of the model BUZYME3500 of specific Bark Mann production carries out enzymatic treatment to bamboo pulp, and controls this and brighten enzyme
Additive amount is 0.16~0.25kg/admt, reaction temperature is 47~65 DEG C, and pH value is 4.5~7.0, makes to brighten at enzyme by this
Pulp brightness after reason is up to 87 degree or more, and compared with prior art common brightens enzymatic treatment, whiteness can be improved at least 3 degree with
On, and pulp brightness is stablized at 87 degree or more, will not there is a phenomenon where anti-Huangs；
(2) present invention has advanced optimized two sections of delignifications, chlorine dioxide and hydrogen peroxide and oxygen boosting alkali density work
The process conditions of sequence, and cooperate with the bleach boosters stoste of the model AP8138 of Bark Mann production, model AP8138
Bleach boosters stoste and viscosity protective agent processing, greatly reduce the dosages such as bleaching agent chlorine dioxide, hydrogen peroxide, make
The dosage of chlorine dioxide drops to 1~3kg/adm, and the dosage of hydrogen peroxide declines 1kg/admt, therefore, bleaching process of the invention
Production cost is greatly reduced, under conditions of manufacturing the pulpboard of high whiteness, the chemical bleachings such as chlorine dioxide can be greatly reduced
The usage amount of agent reduces harmful substance and subsequent wastewater treatment difficulty in waste water, realizes the huge of annual about million yuan of saving
Big economic benefit；
(3) the bleached pulp whiteness that the present invention obtains is high, high-quality, especially suitable for fine tissue of manufacturing paper with pulp.
Specific implementation mode
The invention will be further described with the following Examples.
Embodiment 1.
A kind of paper pulp bleaching process of high whiteness paper for daily use of the present invention, including following processing step：
A, two sections of delignification bleachings：
A1) one section of delignification bleaching：
The sulfuric acid of the caustic soda and 1kg/admt that account for air dried pulp weight 1.2% is added into the slurry after wash engine washing concentrating
Magnesium is sent into first segment medium-consistency pulp mixer after low-pressure steam is heated to 90 DEG C, and 20kg/ is added in dense mixer in the first paragraph
Admt oxygen mix uniformly enters lifting/lowering streaming reaction tube afterwards, and residence time of the slurry in lifting/lowering streaming reaction tube be
6min；
A2) two sections of delignification bleachings：
The slurry come out from first segment downflow tower is sent into second segment medium-consistency pulp mixer after middle pressure steam is heated to 95 DEG C,
It is uniform that 20kg/admt oxygen mix is added in second segment medium-consistency pulp mixer, send to upflow tower, and control tower top pressure and be
0.4MPa, temperature is 90 DEG C in tower, and the paper pulp residence time is 70min；Then pulp blowing out to oxygen is taken off in blow bin, it is spare；
B, it washs for the first time：
The slurry that step a is obtained is spare after wash engine washing concentrating；
C, the ClO 2 bleaching under strong acid condition：
Dense standpipe in being sent into after the pulp concentration obtained after step b washings, is then added sulfuric acid, and it is 2.0 to adjust pH value,
Then slurry is heated to steam being sent into medium-consistency pulp mixer after 75 DEG C, 6kg/admt, dense is then added into medium-consistency pulp mixer
Degree is the ClO 2 solution of 9.0g/l and is uniformly mixed that then slurry enters in upflow tower, from overflow at the top of upflow tower to
Downflow tower, slurry are 120min in the residence time of upflow tower and downflow tower；
D, it washs for second：
Slurry is drawn to wash engine from downflow tower and is washed, concentrates, spare；
E, bleach boosters are added：
The model AP8138 that the slurry obtained after step d washings is produced in the addition Bark Mann of wash engine stern notch
Bleach boosters stoste, control bleach boosters additive amount be 0.2kg/admt, temperature be 75 DEG C, pH value 11.5；
F, hydrogen peroxide and oxygen boosting alkali density：
Caustic soda, hydrogen peroxide and oxygen is added in wash engine stern notch in the slurry obtained after step d washings, adjusts pH value 11.5
Medium-consistency pulp mixer is sent into after~12 to be uniformly mixed, then slurry enters in upflow tower, from upflow tower top overflow to downflow tower,
Slurry is 60min in the residence time of upflow tower and downflow tower, and temperature is 8 DEG C；
G, third time is washed：
Slurry after step e, f is sent to wash engine washing concentrating, spare；
H, sulfuric acid is added in wash engine stern notch in the slurry obtained after step g washings, it is dense mixed in being sent into after adjusting pH value 3.5
Clutch, be added into medium-consistency pulp mixer 3kg/admt, a concentration of 9.0g/l ClO 2 solution and be uniformly mixed, then slurry
It enters in upflow tower, from upflow tower top overflow to downflow tower, slurry is in the residence time of upflow tower and downflow tower
250min, temperature are 80 DEG C；
When slurry is extracted out from bleaching action tower bottom, 1kg/admt, a concentration of 100g/l hypo solutions is added, in
The complete residual chlorine with unreacted in slurry；
I, the 4th washing：
Slurry after step h is sent to wash engine washing concentrating, spare；
J, enzymatic treatment is brightened：
The model that the slurry obtained after step i washings is produced in the addition Bark Mann of wash engine stern notch
BUZYME3500's brightens proenzyme liquid and viscosity protective agent mannitol, and it is 0.25kg/admt, mannitol that enzyme additive amount is brightened in control
Additive amount be 1.8kg/admt, dense tower during then slurry is delivered to, controlled at 50 DEG C, pH value 6.0, by brightening enzyme
Treated, and slurry is delivered to the storage of finished pulp tower, spare.
Embodiment 2.
A kind of paper pulp bleaching process of high whiteness paper for daily use of the present invention, including following processing step：
A, two sections of delignification bleachings：
A1) one section of delignification bleaching：
The sulfuric acid of the caustic soda and 2kg/admt that account for air dried pulp weight 2.5% is added into the slurry after wash engine washing concentrating
Magnesium is sent into first segment medium-consistency pulp mixer after low-pressure steam is heated to 93 DEG C, and 22kg/ is added in dense mixer in the first paragraph
Admt oxygen mix uniformly enters lifting/lowering streaming reaction tube afterwards, and residence time of the slurry in lifting/lowering streaming reaction tube be
7min；
A2) two sections of delignification bleachings：
The slurry come out from first segment downflow tower is sent into second segment medium-consistency pulp mixer after middle pressure steam is heated to 98 DEG C,
It is uniform that 22kg/admt oxygen mix is added in second segment medium-consistency pulp mixer, send to upflow tower, and control tower top pressure and be
0.6MPa, temperature is 100 DEG C in tower, and the paper pulp residence time is 50min；Then pulp blowing out to oxygen is taken off in blow bin, it is spare；
B, it washs for the first time：
The slurry that step a is obtained is spare after wash engine washing concentrating；
C, the ClO 2 bleaching under strong acid condition：
Dense standpipe in being sent into after the pulp concentration obtained after step b washings, is then added sulfuric acid, and it is 2.5 to adjust pH value,
Then slurry is heated to steam being sent into medium-consistency pulp mixer after 80 DEG C, 8kg/admt, dense is then added into medium-consistency pulp mixer
Degree is the ClO 2 solution of 9.5g/l and is uniformly mixed that then slurry enters in upflow tower, from overflow at the top of upflow tower to
Downflow tower, slurry are 135min in the residence time of upflow tower and downflow tower；
D, it washs for second：
Slurry is drawn to wash engine from downflow tower and is washed, concentrates, spare；
E, bleach boosters are added：
The model AP8138 that the slurry obtained after step d washings is produced in the addition Bark Mann of wash engine stern notch
Bleach boosters stoste, control bleach boosters additive amount be 0.25kg/admt, temperature be 78 DEG C, pH value 11.8；
F, hydrogen peroxide and oxygen boosting alkali density：
Caustic soda, hydrogen peroxide and oxygen is added in wash engine stern notch in the slurry obtained after step d washings, adjusts pH value 11.5
Medium-consistency pulp mixer is sent into after~12 to be uniformly mixed, then slurry enters in upflow tower, from upflow tower top overflow to downflow tower,
Slurry is 65min in the residence time of upflow tower and downflow tower, and temperature is 83 DEG C；
G, third time is washed：
Slurry after step e, f is sent to wash engine washing concentrating, spare；
H, sulfuric acid is added in wash engine stern notch in the slurry obtained after step g washings, it is dense mixed in being sent into after adjusting pH value 4.0
Clutch, be added into medium-consistency pulp mixer 2kg/admt, a concentration of 9.6g/l ClO 2 solution and be uniformly mixed, then slurry
It enters in upflow tower, from upflow tower top overflow to downflow tower, slurry is in the residence time of upflow tower and downflow tower
280min, temperature are 82 DEG C；
When slurry is extracted out from bleaching action tower bottom, 1.5kg/admt, a concentration of 110g/l hypo solutions is added,
Neutralize the residual chlorine that unreacted is complete in slurry；
I, the 4th washing：
Slurry after step h is sent to wash engine washing concentrating, spare；
J, enzymatic treatment is brightened：
The model that the slurry obtained after step i washings is produced in the addition Bark Mann of wash engine stern notch
BUZYME3500's brightens proenzyme liquid and viscosity protective agent sodium gluconate, and it is 0.20kg/admt, Portugal that enzyme additive amount is brightened in control
The additive amount of grape sodium saccharate is 2.6kg/admt, and dense tower during then slurry is delivered to, controlled at 58 DEG C, pH value 5.0 passes through
The slurry crossed after brightening enzymatic treatment is delivered to the storage of finished pulp tower, spare
Embodiment 3.
A kind of paper pulp bleaching process of high whiteness paper for daily use of the present invention, including following processing step：
A, two sections of delignification bleachings：
A1) one section of delignification bleaching：
The sulfuric acid of the caustic soda and 3kg/admt that account for air dried pulp weight 3.0% is added into the slurry after wash engine washing concentrating
Magnesium is sent into first segment medium-consistency pulp mixer after low-pressure steam is heated to 95 DEG C, and 25kg/ is added in dense mixer in the first paragraph
Admt oxygen mix uniformly enters lifting/lowering streaming reaction tube afterwards, and residence time of the slurry in lifting/lowering streaming reaction tube be
10min；
A2) two sections of delignification bleachings：
The slurry come out from first segment downflow tower is sent into second segment medium-consistency pulp mixer after middle pressure steam is heated to 100 DEG C,
It is uniform that 25kg/admt oxygen mix is added in second segment medium-consistency pulp mixer, send to upflow tower, and control tower top pressure and be
0.5MPa, temperature is 96 DEG C in tower, and the paper pulp residence time is 60min；Then pulp blowing out to oxygen is taken off in blow bin, it is spare；
B, it washs for the first time：
The slurry that step a is obtained is spare after wash engine washing concentrating；
C, the ClO 2 bleaching under strong acid condition：
Dense standpipe in being sent into after the pulp concentration obtained after step b washings, is then added sulfuric acid, and it is 3.0 to adjust pH value,
Then slurry is heated to steam being sent into medium-consistency pulp mixer after 75~85 DEG C, 10kg/ is then added into medium-consistency pulp mixer
Admt, a concentration of 10.0g/l ClO 2 solution and be uniformly mixed, then slurry enters in upflow tower, from up-flow tower top
Portion's overflow to downflow tower, slurry is 150min in the residence time of upflow tower and downflow tower；
D, it washs for second：
Slurry is drawn to wash engine from downflow tower and is washed, concentrates, spare；
E, bleach boosters are added：
The model AP8138 that the slurry obtained after step d washings is produced in the addition Bark Mann of wash engine stern notch
Bleach boosters stoste, control bleach boosters additive amount be 0.3kg/admt, temperature be 80 DEG C, pH value 12.0；
F, hydrogen peroxide and oxygen boosting alkali density：
Caustic soda, hydrogen peroxide and oxygen is added in wash engine stern notch in the slurry obtained after step d washings, adjusts pH value 11.5
Medium-consistency pulp mixer is sent into after~12 to be uniformly mixed, then slurry enters in upflow tower, from upflow tower top overflow to downflow tower,
Slurry is 70min in the residence time of upflow tower and downflow tower, and temperature is 85 DEG C；
G, third time is washed：
Slurry after step e, f is sent to wash engine washing concentrating, spare；
H, sulfuric acid is added in wash engine stern notch in the slurry obtained after step g washings, it is dense mixed in being sent into after adjusting pH value 4.5
Clutch, into medium-consistency pulp mixer be added 1kg/admt, a concentration of 10.0g/l ClO 2 solution and be uniformly mixed, then starch
Material enters in upflow tower, and from upflow tower top overflow to downflow tower, slurry is in the residence time of upflow tower and downflow tower
300min, temperature are 85 DEG C；
When slurry is extracted out from bleaching action tower bottom, 2kg/admt, a concentration of 120g/l hypo solutions is added, in
The complete residual chlorine with unreacted in slurry；
I, the 4th washing：
Slurry after step h is sent to wash engine washing concentrating, spare；
J, enzymatic treatment is brightened：
The model that the slurry obtained after step i washings is produced in the addition Bark Mann of wash engine stern notch
BUZYME3500's brightens proenzyme liquid and viscosity protective agent, and viscosity protective agent is sodium gluconate and odium stearate according to mass ratio
For 1: 1 mixture, it is 0.16kg/admt that enzyme additive amount is brightened in control, and the total addition level of viscosity protective agent is 3.5kg/admt,
Then dense tower during slurry is delivered to, controlled at 62 DEG C, pH value 5.55, the slurry after brightening enzymatic treatment is delivered into
Product starch tower storage, spare
Finally it should be noted that above example is only used to illustrate the technical scheme of the present invention rather than is protected to the present invention
The limitation of range, although being explained in detail to the present invention with reference to preferred embodiment, those skilled in the art should manage
Solution, technical scheme of the present invention can be modified or replaced equivalently, without departing from technical solution of the present invention essence and
Range.
Claims (6)
1. a kind of paper pulp bleaching process of high whiteness paper for daily use, it is characterised in that：Including following processing step：
A, two sections of delignification bleachings：
A1) one section of delignification bleaching：
The caustic soda and 1~3kg/admt for accounting for air dried pulp weight 2.0%~3.0% are added into the slurry after wash engine washing concentrating
Magnesium sulfate, after low-pressure steam is heated to 90~95 DEG C be sent into first segment medium-consistency pulp mixer, in the first paragraph in dense mixer
20~25kg/admt oxygen mix is added and uniformly enters lifting/lowering streaming reaction tube afterwards, slurry is in lifting/lowering streaming reaction tube
Residence time is 5~10min；
A2) two sections of delignification bleachings：
The slurry come out from first segment downflow tower is sent into second segment medium-consistency pulp mixer after middle pressure steam is heated to 95~102 DEG C,
It is uniform that 20~25kg/admt oxygen mix is added in second segment medium-consistency pulp mixer, send to upflow tower, and control tower top pressure and be
0.4~0.6MPa, temperature is 90~100 DEG C in tower, and the paper pulp residence time is 50~70min；Then pulp blowing out to oxygen is taken off
It is spare in blow bin；
B, it washs for the first time：
The slurry that step a is obtained is spare after wash engine washing concentrating；
C, the ClO 2 bleaching under strong acid condition：
Then sulfuric acid is added in dense standpipe during the slurry that step b is obtained is sent into, it is 2.0~3.0 to adjust pH value, then uses steam
Slurry is heated to be sent into medium-consistency pulp mixer after 75~85 DEG C, 6~10kg/admt, concentration are then added into medium-consistency pulp mixer
For 9.0~10.0g/l ClO 2 solution and be uniformly mixed, then slurry enters in upflow tower, overflows at the top of the upflow tower
It is flow to downflow tower, slurry is 120~150min in the residence time of upflow tower and downflow tower；
D, it washs for second：
Slurry is drawn to wash engine from downflow tower and is washed, concentrates, spare；
E, bleach boosters are added：
The drift for the model AP8138 that the slurry obtained after step d washings is produced in the addition Bark Mann of wash engine stern notch
White accelerating agent stoste, control bleach boosters additive amount are 0.2~0.3kg/admt, and temperature is 75~80 DEG C, pH value 11.5
~12.0；
F, hydrogen peroxide and oxygen boosting alkali density：
Caustic soda, hydrogen peroxide and oxygen is added in wash engine stern notch in the slurry obtained after step d washings, adjusts pH value 11.5~12
It is sent into medium-consistency pulp mixer afterwards to be uniformly mixed, then slurry enters in upflow tower, from upflow tower top overflow to downflow tower, slurry
It is 60~70min in the residence time of upflow tower and downflow tower, temperature is 80~85 DEG C；
G, third time is washed：
Slurry after step e, f is sent to wash engine washing concentrating, spare；
H, ClO 2 bleaching：
Sulfuric acid is added in wash engine stern notch in the slurry obtained after step g washings, it is dense mixed in being sent into after adjusting pH value 3.5~4.5
It is equal that 1~3kg/admt, the ClO 2 solution of a concentration of 9.0~10.0g/l and mixing are added into medium-consistency pulp mixer for clutch
Even, then slurry enters in upflow tower, from upflow tower top overflow to downflow tower, stop of the slurry in upflow tower and downflow tower
Time is 250~300min, and temperature is 80~85 DEG C；
When slurry is extracted out from bleaching action tower bottom, 0.5~2kg/admt, a concentration of 100~120g/l sodium thiosulfate is added
Solution neutralizes the residual chlorine that unreacted is complete in slurry；
I, the 4th washing：
Slurry after step h is sent to wash engine washing concentrating, spare；
J, enzymatic treatment is brightened：
The model BUZYME3500 that the slurry obtained after step i washings is produced in the addition Bark Mann of wash engine stern notch
Brighten proenzyme liquid and viscosity protective agent, it is 0.16~0.25kg/admt, the addition of viscosity protective agent that enzyme additive amount is brightened in control
Amount is 1.8~3.5kg/admt, and dense tower during then slurry is delivered to, controlled at 47~65 DEG C, pH value is 4.5~7.0, warp
The slurry crossed after brightening enzymatic treatment is delivered to the storage of finished pulp tower, spare.
2. a kind of paper pulp bleaching process of high whiteness paper for daily use according to claim 1, it is characterised in that：The step
In j, the additive amount for brightening enzyme is 0.25kg/admt, and the additive amount of viscosity protective agent is 1.8kg/admt, and then slurry is delivered to
In dense tower, controlled at 50 DEG C, pH value 6.0.
3. a kind of paper pulp bleaching process of high whiteness paper for daily use according to claim 1, it is characterised in that：The step
In j, the additive amount for brightening enzyme is 0.20kg/admt, and the additive amount of viscosity protective agent is 2.6kg/admt, and then slurry is delivered to
In dense tower, controlled at 58 DEG C, pH value 5.0.
4. a kind of paper pulp bleaching process of high whiteness paper for daily use according to claim 1, it is characterised in that：The step
In j, the additive amount for brightening enzyme is 0.16kg/admt, and the additive amount of viscosity protective agent is 3.5kg/admt, and then slurry is delivered to
In dense tower, controlled at 62 DEG C, pH value 5.5.
5. a kind of paper pulp bleaching process of high whiteness paper for daily use according to any one of claims 1 to 4, feature exist
In：The viscosity protective agent is at least one of mannitol, sodium gluconate or odium stearate.
6. a kind of paper pulp bleaching process of high whiteness paper for daily use according to claim 1, it is characterised in that：The step
In e, bleach boosters additive amount is 0.25kg/admt, and temperature is 78 DEG C, pH value 11.8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810389474.8A CN108625214A (en) | 2018-04-27 | 2018-04-27 | A kind of paper pulp bleaching process of high whiteness paper for daily use |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810389474.8A CN108625214A (en) | 2018-04-27 | 2018-04-27 | A kind of paper pulp bleaching process of high whiteness paper for daily use |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108625214A true CN108625214A (en) | 2018-10-09 |
Family
ID=63694697
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810389474.8A Pending CN108625214A (en) | 2018-04-27 | 2018-04-27 | A kind of paper pulp bleaching process of high whiteness paper for daily use |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108625214A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102154884A (en) * | 2011-03-31 | 2011-08-17 | 重庆理文造纸有限公司 | Improved bleaching process for bamboo wood dissolving pulp |
| CN104963230A (en) * | 2015-07-15 | 2015-10-07 | 重庆理文造纸有限公司 | Bleaching process for improving whiteness of paper pulp |
| CN104963229A (en) * | 2015-07-15 | 2015-10-07 | 重庆理文造纸有限公司 | Bleaching process of bamboo dissoluble pulp |
-
2018
- 2018-04-27 CN CN201810389474.8A patent/CN108625214A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102154884A (en) * | 2011-03-31 | 2011-08-17 | 重庆理文造纸有限公司 | Improved bleaching process for bamboo wood dissolving pulp |
| CN104963230A (en) * | 2015-07-15 | 2015-10-07 | 重庆理文造纸有限公司 | Bleaching process for improving whiteness of paper pulp |
| CN104963229A (en) * | 2015-07-15 | 2015-10-07 | 重庆理文造纸有限公司 | Bleaching process of bamboo dissoluble pulp |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| FI67895C (en) | FOERFARANDE FOER BLEKNING OCH EXTRAKTION AV LIGNOCELLULOSAMATERIAL. | |
| CN104963229B (en) | A kind of bleaching process of bamboo wood dissolving pulp | |
| CN102154884B (en) | Improved bleaching process for bamboo wood dissolving pulp | |
| CN103726377B (en) | A kind of free pulping method of low polymerization degree bamboo pulp | |
| US4155806A (en) | Method for continuous alkaline delignification of lignocellulose material in two or more steps, the final of which with oxygen | |
| US4196043A (en) | Kraft pulp bleaching and recovery process | |
| SE470065B (en) | Treatment of chemical pulp with an acid and then a magnesium compound in chlorine-free bleaching | |
| US5853535A (en) | Process for manufacturing bleached pulp including recycling | |
| CN101463573B (en) | Straw pulp bleaching technique | |
| US4000033A (en) | Removal of color and organic matter from kraft process bleach effluents | |
| CA2040871C (en) | Process for bleaching of lignocellulose-containing material | |
| CN104963230B (en) | Improve the bleaching process of pulp brightness | |
| US3366534A (en) | Complete chemical system for a kraft mill | |
| CN101760978A (en) | Pulp-bleaching technique | |
| CN104894906A (en) | High-efficiency clean bleaching method of wheat straw pulp | |
| CA2040867C (en) | Reduction of halogenated organic compounds in spent bleach liquor | |
| CN108625214A (en) | A kind of paper pulp bleaching process of high whiteness paper for daily use | |
| CN104313933A (en) | Green bleaching method of sulfate bagasse slurry | |
| CN108277674A (en) | A kind of bleaching process of high whiteness bamboo pulp | |
| CN101864687B (en) | Reed pulp bleaching technology | |
| US5507912A (en) | Kraft pulping process wherein sulphide-rich and sulphide-lean white liquors are generated | |
| CN108589368B (en) | Method for producing high-purity fiber by using wood pulp | |
| CN100500990C (en) | Paper pulp cleaning and bleaching process | |
| CN104611964B (en) | A kind of pulping process of Acacia sulphite process high whiteness semi-chemical pulp | |
| CN112127193A (en) | Production process for improving quality index of dissolving pulp by using bleaching process |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20181009 |