CN104611965A - Pulping method for gum wood high-brightness semi-chemical pulp - Google Patents

Pulping method for gum wood high-brightness semi-chemical pulp Download PDF

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Publication number
CN104611965A
CN104611965A CN201510021273.9A CN201510021273A CN104611965A CN 104611965 A CN104611965 A CN 104611965A CN 201510021273 A CN201510021273 A CN 201510021273A CN 104611965 A CN104611965 A CN 104611965A
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China
Prior art keywords
slurry
bleaching
wood chip
washing
eucalyptus
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CN201510021273.9A
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Chinese (zh)
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CN104611965B (en
Inventor
罗清
刘叶
吴养育
强丹丹
杨保宏
刘琳
赵登
郗文君
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Hubei Guanhe Industrial Technology Co ltd
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Shaanxi University of Science and Technology
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    • 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
    • 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
    • D21C1/00—Pretreatment of the finely-divided materials before digesting
    • D21C1/06—Pretreatment of the finely-divided materials before digesting with alkaline reacting compounds
    • 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
    • D21C5/00—Other processes for obtaining cellulose, e.g. cooking cotton linters ; Processes characterised by the choice of cellulose-containing starting materials
    • 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

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  • 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 discloses a pulping method for gum wood high-brightness semi-chemical pulp. Peeled gum wood is soaked to enable the peeled gum wood to be saturated after absorbing water, then the peeled gum wood is cut into wood chips, after being washed, the wood chips are delivered into a digester and added with water for adjustment, sodium hydroxide, sodium sulfide and anthraquinone are added for high-temperature pre-steaming, and the gum wood high-brightness semi-chemical pulp is obtained after washing, primary defibrination, laccase treatment, secondary defibrination, chlorine dioxide bleaching and hydrogen peroxide bleaching in sequence. According to the pulping method for the gum wood high-brightness semi-chemical pulp, the gum wood is used as the raw material to prepare the semi-chemical pulp, the high pulp yield can be achieved, lignin in the pulp can be appropriately removed, and after bleaching is carried out through the proper bleaching process, the pulp which is high in brightness, high in yield and good in brightness stability can be obtained.

Description

A kind of pulping process of Eucalyptus high whiteness semi-chemical pulp
Technical field
The invention belongs to paper pulp papermaking technical field, be specifically related to a kind of pulping process of Eucalyptus high whiteness semi-chemical pulp.
Background technology
Along with falling sharply of world's wildwood resource, and the swift and violent increase of the growth of paper and paperboard consumption and modern paper industry production capacity, the imbalance between supply and demand of timber is becoming increasingly acute.In recent years the utilization of leaf wood fast growing wood is more and more caused to the attention of papermaking circle.Because Eucalyptus is fast, wood quality is better, and contrario conditional request is not tight, has good economic benefit and ecological benefits, and Eucalyptus is used as pulping and paper-making raw material will have finer prospect.
Because paper industry faces, worldwide there is lack of raw materials and the problem such as environmental pollution, and therefore, Eucalyptus High Yield Pulping Technology is subject to more and more higher attention and obtains developing fast.Along with the progress of pulping technique, the whiteness of Eucalyptus high yield pulp can reach 85%ISO, and whiteness index can meet the requirement of various high added value paper product.Although high-grade paper take bleach chemical pulp as raw material traditionally, because high yield pulp has the feature such as high bulk and high light scattering coefficient, cost is lower simultaneously, so replace partial bleaching chemical pulp to become a kind of trend with high yield pulp in the production of high-grade paper.
But pulp brightness stability is the subject matter that high yield pulp is applied in high-grade paper, traditional high-yield pulp bleaching belongs to the bleaching of reserve quality formula, and after drift, slurry still belongs to high lignin content paper pulp.In slurry, the potential chromophoric group of a large amount of lignin and part extract and auxochrome group regenerate chromophoric group under the effects such as illumination, high temperature and metal ion, and its whiteness significantly declines at short notice, causes brightness reversion phenomenon.The shortcoming of this quick brightness reversion limits it range of application of high yield pulp greatly.
Summary of the invention
The object of this invention is to provide a kind of pulping process of Eucalyptus high whiteness semi-chemical pulp, the semi-chemical pulp intensity prepared is high, whiteness is high and YI yellow index is little.
The technical solution adopted in the present invention is, a kind of pulping process of Eucalyptus high whiteness semi-chemical pulp, and concrete steps are as follows:
Step 1, gets the raw materials ready
First the Eucalyptus after peeling is soaked into standby wooden pond, makes it absorb water saturated, then Eucalyptus is sent into chipping machine, cut as specification is about the wood chip of 30 × 8 × 1.5mm;
Step 2, chip washing
Wood chip is sent into chip washing device to wash, to remove wood fragments bits, silt, remove portion water soluble ingredient simultaneously;
Step 3, charging
Rear wood chip will be washed and send into boiling vessel, and the adjustment that adds water, and add NaOH, vulcanized sodium and anthraquinone;
Step 4, High Temperature Pre steams
Heat up after boiling vessel is airtight, when temperature arrives 150 ~ 160 DEG C, insulation 60 ~ 90min;
Step 5, blowing and pulp washing
Slurry in boiling vessel is put into washer and is washed after stopping by insulation, until wash filtrate pH<8, and extrusion dehydration, make the mass percent concentration of slurry reach 30%;
Step 6, one section of defibrination
Rear paper pulp will be washed add in high-density paste mill and carry out defibrination, refining concentration 30%;
Step 7, laccase treatment
Regulate the slurry concentration after one section of defibrination to be 5%, pH5.5 ~ 6.0, temperature 50 ~ 55 DEG C, adds laccase, with in the reactor of agitating device process 120 ~ 150min;
Step 8, two sections of defibrinations
Slurry after laccase treatment adds in low dense fiberizer and carries out defibrination, refining concentration 5%;
Step 9, ClO 2 bleaching
Paper pulp after two sections of defibrinations carries out dehydration and concentrates, and makes its concentration reach 10%, adds chlorine dioxide, carry out bleaching, and bleaching is carried out slurry washing, made its filtrate weakly acidic pH after stopping;
Step 10, hydrogen peroxide bleaching
Washing disposed slurry, adds hydrogen peroxide, NaOH, Na 2siO 3, carry out bleaching, bleaching is carried out slurry washing, is made its filtrate weakly acidic pH, to obtain final product after stopping.
Feature of the present invention is also,
In step 3, the mass ratio of OD wood chip and water is 1:4 ~ 5, and the mass ratio of NaOH and OD wood chip is 1:9 ~ 10, and the mass ratio of vulcanized sodium and OD wood chip is 1:50 ~ 60, and the mass ratio of anthraquinone and OD wood chip is 1:1000 ~ 1500.
In step 7, the addition of laccase is 20 ~ 25U/g over dry slurry.
In step 9, chlorine dioxide is 2 ~ 6% to the mass percent of over dry slurry.
In step 9, bleaching processes 120 ~ 150min at 80 ~ 90 DEG C.
In step 10, hydrogen peroxide is 3 ~ 5%, NaOH to the mass percent of over dry slurry is 2%, Na to the mass percent of over dry slurry 2siO 3be 3% to the mass percent of over dry slurry.
In step 10, bleaching processes 120 ~ 150min at temperature is 80 ~ 90 DEG C.
The invention has the beneficial effects as follows, the pulping process of Eucalyptus high whiteness semi-chemical pulp of the present invention, take Eucalyptus as raw material, produce semi-chemical pulp, both higher paper pulp yield can be obtained, suitably can remove again the lignin in paper pulp, then bleach through suitable bleaching process, the good paper pulp of high whiteness, high yield pulp1 and retention of whiteness can be obtained.
Detailed description of the invention
Below in conjunction with detailed description of the invention, the present invention is described in detail.
The pulping process of Eucalyptus high whiteness semi-chemical pulp of the present invention, concrete steps are as follows:
Step 1, gets the raw materials ready
First the Eucalyptus after peeling is soaked into standby wooden pond, makes it absorb water saturated, then Eucalyptus is sent into chipping machine, cut as specification is about the wood chip of 30 × 8 × 1.5mm;
Step 2, chip washing
Wood chip is sent into chip washing device to wash, to remove the impurity such as wood fragments bits, silt, simultaneously can remove portion water soluble ingredient;
Step 3, charging
Rear wood chip will be washed and send into boiling vessel, and the adjustment that adds water, in boiling vessel, the mass ratio of OD wood chip and water is 1:4 ~ 5, and add NaOH, vulcanized sodium and anthraquinone, the mass ratio of NaOH and OD wood chip is 1:9 ~ 10, the mass ratio of vulcanized sodium and OD wood chip is 1:50 ~ 60, and the mass ratio of anthraquinone and OD wood chip is 1:1000 ~ 1500; (OD wood chip: refer to that water content is the wood chip of 0, for wood chip metering)
Step 4, High Temperature Pre steams
Heat up after boiling vessel is airtight, when temperature arrives 150 ~ 160 DEG C, insulation 60 ~ 90min;
Step 5, blowing and pulp washing
Slurry in boiling vessel is put into washer and is washed after stopping by insulation, until wash filtrate pH<8, and extrusion dehydration, make the mass percent concentration of slurry reach 30%;
Step 6, one section of defibrination
Rear paper pulp will be washed add in high-density paste mill and carry out defibrination, refining concentration 30%;
Step 7, laccase treatment
Regulate the slurry concentration after one section of defibrination to be 5%, pH5.5 ~ 6.0, temperature 50 ~ 55 DEG C, adds laccase, and its consumption is 20 ~ 25U/g over dry slurry, with in the reactor of agitating device process 120 ~ 150min; (over dry slurry: refer to that water content is the slurry of 0, for slurry metering)
Step 8, two sections of defibrinations
Slurry after laccase treatment adds in low dense fiberizer and carries out defibrination, refining concentration 5%;
Step 9, ClO 2 bleaching
Paper pulp after two sections of defibrinations carries out dehydration and concentrates, its concentration is made to reach 10%, adding the mass percent of over dry slurry is the chlorine dioxide of 2 ~ 6%, bleaching action is carried out at the temperature of 80 ~ 90 DEG C, time is 120 ~ 150min, bleaching is carried out slurry washing, is made its filtrate weakly acidic pH after stopping;
Step 10, hydrogen peroxide bleaching
Washing disposed slurry, add the mass percent of over dry slurry be 3 ~ 5% hydrogen peroxide, the NaOH of 2%, the Na of 3% 2siO 3, temperature be 80 ~ 90 DEG C, slurry concentration carries out bleaching action under being the condition of 10%, the time is 120 ~ 150min, and bleaching is carried out slurry washing, made its filtrate weakly acidic pH, to obtain final product after stopping.
Embodiment 1
(1) get the raw materials ready
First the Eucalyptus after peeling is soaked into standby wooden pond, makes it absorb water saturated, then Eucalyptus is sent into chipping machine, cut as specification is about the wood chip of 30 × 8 × 1.5mm;
(2) chip washing
Wood chip is sent into chip washing device to wash, to remove the impurity such as wood fragments bits, silt, simultaneously can remove portion water soluble ingredient;
(3) feed
Rear wood chip will be washed and send into thermophilic digestion device, and the adjustment that adds water, in boiling vessel, the mass ratio of OD wood chip and water is 1:5, and add NaOH, vulcanized sodium and anthraquinone, the mass ratio of NaOH and OD wood chip is 1:10, the mass ratio of vulcanized sodium and OD wood chip is 1:60, and the mass ratio of anthraquinone and OD wood chip is 1:1500;
(4) High Temperature Pre steams
Heat up after boiling vessel is airtight, when temperature arrives 150 DEG C, insulation 60min;
(5) blowing and pulp washing
Slurry in boiling vessel is put into washer and is washed after stopping by insulation, until wash filtrate pH<8.0, and extrusion dehydration, make the mass percent concentration of slurry reach 30%;
(6) one sections of defibrinations
Rear paper pulp will be washed add in high-density paste mill and carry out defibrination, refining concentration 30%;
(7) laccase treatment
Regulate the slurry concentration after one section of defibrination to be 5%, pH6.0, temperature 50 C, adds laccase, and its consumption is 20U/g over dry slurry, processing 120min with in the reactor of agitating device;
(8) two sections of defibrinations
Slurry after laccase treatment adds in low dense fiberizer and carries out defibrination, refining concentration 5%;
(9) ClO 2 bleaching
Paper pulp after two sections of defibrinations carries out dehydration and concentrates, and make its concentration reach 10%, adding the mass percent of over dry slurry is the chlorine dioxide of 2%, at the temperature of 80 DEG C, carry out bleaching action, the time is 120min, after bleaching stops, carry out slurry washing, make its filtrate weakly acidic pH;
(10) hydrogen peroxide bleaching
Washing disposed slurry, add the mass percent of over dry slurry be 3% hydrogen peroxide, the NaOH of 2%, the Na of 3% 2siO 3, temperature be 80 DEG C, stock quality percent concentration carries out bleaching action under being the condition of 10%, the time is 120min, and bleaching is carried out slurry washing, made its filtrate weakly acidic pH, to obtain final product after stopping.
The Eucalyptus semi-chemical pulp that embodiment 1 prepares has higher yield and good mechanical strength, pulp brightness and retention of whiteness, and yield of bleached pulp is 60.5%, and the tensile index of bleached pulp is 60.3N.m/g, and tear index is 7.9mN.m 2/ g, zero span tensile strength is 98.9N/cm, and pulp brightness is 76.8%ISO, and YI yellow index is 1.37%.
Embodiment 2
(1) get the raw materials ready
First the Eucalyptus after peeling is soaked into standby wooden pond, makes it absorb water saturated, then Eucalyptus is sent into chipping machine, cut as specification is about the wood chip of 30 × 8 × 1.5mm;
(2) chip washing
Wood chip is sent into chip washing device to wash, to remove the impurity such as wood fragments bits, silt, simultaneously can remove portion water soluble ingredient;
(3) feed
Rear wood chip will be washed and send into boiling vessel, and the mass ratio regulating OD wood chip and water in boiling vessel that adds water is 1:5, and add NaOH, vulcanized sodium and anthraquinone, the mass ratio of NaOH and OD wood chip is 1:10, the mass ratio of vulcanized sodium and OD wood chip is 1:50, and the mass ratio of anthraquinone and OD wood chip is 1:1500;
(4) High Temperature Pre steams
Heat up after boiling vessel is airtight, when temperature arrives 150 DEG C, insulation 90min;
(5) blowing and pulp washing
Slurry in boiling vessel is put into washer and is washed after stopping by insulation, until wash filtrate pH<8.0, and extrusion dehydration, make the mass percent concentration of slurry reach 30%;
(6) one sections of defibrinations
Rear paper pulp will be washed add in high-density paste mill and carry out defibrination, refining concentration 30%;
(7) laccase treatment
Regulate the slurry concentration after one section of defibrination to be 5%, pH5.5, temperature 50 C, adds laccase, and its consumption is 25U/g over dry slurry, processing 120min with in the reactor of agitating device;
(8) two sections of defibrinations
Slurry after laccase treatment adds in low dense fiberizer and carries out defibrination, refining concentration 5%;
(9) ClO 2 bleaching
Paper pulp after two sections of defibrinations carries out dehydration and concentrates, and make its concentration reach 10%, adding the mass percent of over dry slurry is the chlorine dioxide of 3%, at the temperature of 90 DEG C, carry out bleaching action, the time is 120min, after bleaching stops, carry out slurry washing, make its filtrate weakly acidic pH;
(10) hydrogen peroxide bleaching
Washing disposed slurry, add the mass percent of over dry slurry be 3% hydrogen peroxide, the NaOH of 2%, the Na of 3% 2siO 3, temperature be 80 DEG C, stock quality percent concentration carries out bleaching action under being the condition of 10%, the time is 120min, and bleaching is carried out slurry washing, made its filtrate weakly acidic pH, to obtain final product after stopping.
The Eucalyptus semi-chemical pulp that embodiment 2 prepares has higher yield and good mechanical strength, pulp brightness and retention of whiteness, and yield of bleached pulp is 58.8%, and the slurry tensile index after boiling and bleaching is 62.0N.m/g, and tear index is 8.2mN.m 2/ g, zero span tensile strength is 100.1N/cm, and pulp brightness is 77.9%ISO, and YI yellow index is 1.24%.
Embodiment 3
(1) get the raw materials ready
First the Eucalyptus after peeling is soaked into standby wooden pond, makes it absorb water saturated, then Eucalyptus is sent into chipping machine, cut as specification is about the wood chip of 30 × 8 × 1.5mm;
(2) chip washing
Wood chip is sent into chip washing device to wash, to remove the impurity such as wood fragments bits, silt, simultaneously can remove portion water soluble ingredient;
(3) feed
Rear wood chip will be washed and send into thermophilic digestion device, and the adjustment that adds water, in boiling vessel, the mass ratio of OD wood chip and water is 1:4, and add NaOH, vulcanized sodium and anthraquinone, the mass ratio of NaOH and OD wood chip is 1:10, the mass ratio of vulcanized sodium and OD wood chip is 1:50, and the mass ratio of anthraquinone and OD wood chip is 1:1000;
(4) High Temperature Pre steams
Heat up after boiling vessel is airtight, when temperature arrives 160 DEG C, insulation 60min;
(5) blowing and pulp washing
Slurry in boiling vessel is put into washer and is washed after stopping by insulation, until wash filtrate pH<8.0, and extrusion dehydration, make the mass percent concentration of slurry reach 30%;
(6) one sections of defibrinations
Rear paper pulp will be washed add in high-density paste mill and carry out defibrination, refining concentration 30%;
(7) laccase treatment
Regulate the slurry concentration after one section of defibrination to be 5%, pH5.5, temperature is 50 DEG C, adds laccase, and its consumption is 25U/g over dry slurry, processing 120min with in the reactor of agitating device;
(8) two sections of defibrinations
Slurry after laccase treatment adds in low dense fiberizer and carries out defibrination, refining concentration 5%;
(9) ClO 2 bleaching
Paper pulp after two sections of defibrinations carries out dehydration and concentrates, and make its concentration reach 10%, adding the mass percent of over dry slurry is the chlorine dioxide of 4%, at the temperature of 80 DEG C, carry out bleaching action, the time is 120min, after bleaching stops, carry out slurry washing, make its filtrate weakly acidic pH;
(10) hydrogen peroxide bleaching
Washing disposed slurry, add the mass percent of over dry slurry be 4% hydrogen peroxide, the NaOH of 2%, the Na of 3% 2siO 3, temperature be 80 DEG C, the mass percent concentration of slurry carries out bleaching action under being the condition of 10%, the time is 120min.Bleaching is carried out slurry washing, is made its filtrate weakly acidic pH, to obtain final product after stopping.
The Eucalyptus semi-chemical pulp that embodiment 3 prepares has higher yield and good mechanical strength, pulp brightness and retention of whiteness, and yield of bleached pulp is 57.2%, and the slurry tensile index after boiling and bleaching is 59.7N.m/g, and tear index is 8.1mN.m 2/ g, zero span tensile strength is 98.9N/cm, and pulp brightness is 80.1%ISO, and YI yellow index is 1.11%.
Embodiment 4
(1) get the raw materials ready
First the Eucalyptus after peeling is soaked into standby wooden pond, makes it absorb water saturated, then Eucalyptus is sent into chipping machine, cut as specification is about the wood chip of 30 × 8 × 1.5mm;
(2) chip washing
Wood chip is sent into chip washing device to wash, to remove the impurity such as wood fragments bits, silt, simultaneously can remove portion water soluble ingredient;
(3) feed
Rear wood chip will be washed and send into thermophilic digestion device, and the adjustment that adds water, in boiling vessel, the mass ratio of wood chip and water is 1:4, and add NaOH, vulcanized sodium and anthraquinone, the mass ratio of NaOH and OD wood chip is 1:10, the mass ratio of vulcanized sodium and OD wood chip is 1:50, and the mass ratio of anthraquinone and OD wood chip is 1:1000;
(4) High Temperature Pre steams
Heat up after boiling vessel is airtight, when temperature arrives 160 DEG C, insulation 90min;
(5) blowing and pulp washing
Slurry in boiling vessel is put into washer and is washed after stopping by insulation, until wash filtrate pH<8.0, and extrusion dehydration, make the mass percent concentration of slurry reach 30%;
(6) one sections of defibrinations
Rear paper pulp will be washed add in high-density paste mill and carry out defibrination, refining concentration 30%;
(7) laccase treatment
Regulate the slurry concentration after one section of defibrination to be 5%, pH5.5, temperature is 50 DEG C, adds laccase, and its consumption is 25U/g over dry slurry, processing 150min with in the reactor of agitating device;
(8) two sections of defibrinations
Slurry after laccase treatment adds in low dense fiberizer and carries out defibrination, refining concentration 5%;
(9) ClO 2 bleaching
Paper pulp after two sections of defibrinations carries out dehydration and concentrates, and make its concentration reach 10%, adding the mass percent of over dry slurry is the chlorine dioxide of 5%, at the temperature of 90 DEG C, carry out bleaching action, the time is 150min, after bleaching stops, carry out slurry washing, make its filtrate weakly acidic pH.
(10) hydrogen peroxide bleaching
Washing disposed slurry, add the mass percent of over dry slurry be 4% hydrogen peroxide, the NaOH of 2%, the Na of 3% 2siO 3, temperature be 90 DEG C, the mass percent concentration of slurry carries out bleaching action under being the condition of 10%, the time is 120min, and bleaching is carried out slurry washing, made its filtrate weakly acidic pH, to obtain final product after stopping.
The Eucalyptus semi-chemical pulp that embodiment 4 prepares has higher yield and good mechanical strength, pulp brightness and retention of whiteness, and yield of bleached pulp is 56.7%, and the slurry tensile index after boiling and bleaching is 58.2N.m/g, and tear index is 7.9mN.m 2/ g, zero span tensile strength is 99.7N/cm, and pulp brightness is 81.7%ISO, and YI yellow index is 0.71%.
Embodiment 5
(1) get the raw materials ready
First the Eucalyptus after peeling is soaked into standby wooden pond, makes it absorb water saturated, then Eucalyptus is sent into chipping machine, cut as specification is about the wood chip of 30 × 8 × 1.5mm;
(2) chip washing
Wood chip is sent into chip washing device to wash, to remove the impurity such as wood fragments bits, silt, simultaneously can remove portion water soluble ingredient;
(3) feed
Rear wood chip will be washed and send into boiling vessel, and the mass ratio regulating OD wood chip and water in boiling vessel that adds water is 1:4, and add NaOH, vulcanized sodium and anthraquinone, the mass ratio of NaOH and OD wood chip is 1:10, the mass ratio of vulcanized sodium and OD wood chip is 1:50, and the mass ratio of anthraquinone and OD wood chip is 1:1000;
(4) High Temperature Pre steams
Heat up after boiling vessel is airtight, when temperature arrives 160 DEG C, insulation 90min;
(5) blowing and pulp washing
Slurry in boiling vessel is put into washer and is washed after stopping by insulation, until wash filtrate pH<8.0, and extrusion dehydration, make the mass percent concentration of slurry reach 30%;
(6) one sections of defibrinations
Rear paper pulp will be washed add in high-density paste mill and carry out defibrination, refining concentration 30%;
(7) laccase treatment
Regulate the slurry concentration after one section of defibrination to be 5%, pH5.0, temperature is 55 DEG C, adds laccase, and its consumption is 25U/g over dry slurry, processing 150min with in the reactor of agitating device;
(8) two sections of defibrinations
Slurry after laccase treatment adds in low dense fiberizer and carries out defibrination, refining concentration 5%;
(9) ClO 2 bleaching
Paper pulp after two sections of defibrinations carries out dehydration and concentrates, and make its concentration reach 10%, adding the mass percent of over dry slurry is the chlorine dioxide of 5%, at the temperature of 90 DEG C, carry out bleaching action, the time is 150min, after bleaching stops, carry out slurry washing, make its filtrate weakly acidic pH.
(10) hydrogen peroxide bleaching
Washing disposed slurry, add the mass percent of over dry slurry be 5% hydrogen peroxide, the NaOH of 2%, the Na of 3% 2siO 3, temperature be 90 DEG C, the mass percent concentration of slurry carries out bleaching action under being the condition of 10%, the time is 150min, and bleaching is carried out slurry washing, made its filtrate weakly acidic pH, to obtain final product after stopping.
The Eucalyptus semi-chemical pulp that embodiment 5 prepares has higher yield and good mechanical strength, pulp brightness and retention of whiteness, and yield of bleached pulp is 56.4%, and the slurry tensile index after boiling and bleaching is 57.3N.m/g, and tear index is 8.6mN.m 2/ g, zero span tensile strength is 99.3N/cm, and pulp brightness is 84.1%ISO, and YI yellow index is 0.49%.
Embodiment 6
(1) get the raw materials ready
First the Eucalyptus after peeling is soaked into standby wooden pond, makes it absorb water saturated, then Eucalyptus is sent into chipping machine, cut as specification is about the wood chip of 30 × 8 × 1.5mm;
(2) chip washing
Wood chip is sent into chip washing device to wash, to remove the impurity such as wood fragments bits, silt, simultaneously can remove portion water soluble ingredient;
(3) feed
Rear wood chip will be washed and send into thermophilic digestion device, and the adjustment that adds water, in boiling vessel, the mass ratio of OD wood chip and water is 1:4, and add NaOH, vulcanized sodium and anthraquinone, the mass ratio of NaOH and OD wood chip is 1:10, the mass ratio of vulcanized sodium and OD wood chip is 1:50, and the mass ratio of anthraquinone and OD wood chip is 1:1000;
(4) High Temperature Pre steams
Heat up after boiling vessel is airtight, when temperature arrives 160 DEG C, insulation 90min;
(5) blowing and pulp washing
Slurry in boiling vessel is put into washer and is washed after stopping by insulation, until wash filtrate pH<8.0, and extrusion dehydration, make the mass percent concentration of slurry reach 30%;
(6) one sections of defibrinations
Rear paper pulp will be washed add in high-density paste mill and carry out defibrination, refining concentration 30%;
(7) laccase treatment
Regulate the slurry concentration after one section of defibrination to be 5%, pH6.0, temperature is 55 DEG C, adds laccase, and its consumption is 25U/g over dry slurry, processing 150min with in the reactor of agitating device;
(8) two sections of defibrinations
Slurry after laccase treatment adds in low dense fiberizer and carries out defibrination, refining concentration 5%;
(9) ClO 2 bleaching
Paper pulp after two sections of defibrinations carries out dehydration and concentrates, and make its concentration reach 10%, adding the mass percent of over dry slurry is the chlorine dioxide of 6%, at the temperature of 90 DEG C, carry out bleaching action, the time is 150min, after bleaching stops, carry out slurry washing, make its filtrate weakly acidic pH;
(10) hydrogen peroxide bleaching
Washing disposed slurry, add the mass percent of over dry slurry be 4% hydrogen peroxide, the NaOH of 2%, the Na of 3% 2siO 3, temperature be 90 DEG C, the mass percent concentration of slurry carries out bleaching action under being the condition of 10%, the time is 150min, and bleaching is carried out slurry washing, made its filtrate weakly acidic pH after stopping.
The Eucalyptus semi-chemical pulp that embodiment 6 prepares has higher yield and good mechanical strength, pulp brightness and retention of whiteness, and yield of bleached pulp is 55.4%, and the slurry tensile index after boiling and bleaching is 56.0N.m/g, and tear index is 8.7mN.m 2/ g, zero span tensile strength is 100.4N/cm, and pulp brightness is 85.3%ISO, and YI yellow index is 0.53%.

Claims (7)

1. a pulping process for Eucalyptus high whiteness semi-chemical pulp, it is characterized in that, concrete steps are as follows:
Step 1, gets the raw materials ready
First the Eucalyptus after peeling is soaked into standby wooden pond, makes it absorb water saturated, then Eucalyptus is sent into chipping machine, cut as specification is about the wood chip of 30 × 8 × 1.5mm;
Step 2, chip washing
Wood chip is sent into chip washing device to wash, to remove wood fragments bits, silt, remove portion water soluble ingredient simultaneously;
Step 3, charging
Rear wood chip will be washed and send into boiling vessel, and the adjustment that adds water, and add NaOH, vulcanized sodium and anthraquinone;
Step 4, High Temperature Pre steams
Heat up after boiling vessel is airtight, when temperature arrives 150 ~ 160 DEG C, insulation 60 ~ 90min;
Step 5, blowing and pulp washing
Slurry in boiling vessel is put into washer and is washed after stopping by insulation, until wash filtrate pH<8, and extrusion dehydration, make the mass percent concentration of slurry reach 30%;
Step 6, one section of defibrination
Rear paper pulp will be washed add in high-density paste mill and carry out defibrination, refining concentration 30%;
Step 7, laccase treatment
Regulate the slurry concentration after one section of defibrination to be 5%, pH5.5 ~ 6.0, temperature 50 ~ 55 DEG C, adds laccase, with in the reactor of agitating device process 120 ~ 150min;
Step 8, two sections of defibrinations
Slurry after laccase treatment adds in low dense fiberizer and carries out defibrination, refining concentration 5%;
Step 9, ClO 2 bleaching
Paper pulp after two sections of defibrinations carries out dehydration and concentrates, and makes its concentration reach 10%, adds chlorine dioxide, carry out bleaching, and bleaching is carried out slurry washing, made its filtrate weakly acidic pH after stopping;
Step 10, hydrogen peroxide bleaching
Washing disposed slurry, adds hydrogen peroxide, NaOH, Na 2siO 3, carry out bleaching, bleaching is carried out slurry washing, is made its filtrate weakly acidic pH, to obtain final product after stopping.
2. the pulping process of Eucalyptus high whiteness semi-chemical pulp according to claim 1, it is characterized in that, in step 3, the mass ratio of OD wood chip and water is 1:4 ~ 5, the mass ratio of NaOH and OD wood chip is 1:9 ~ 10, the mass ratio of vulcanized sodium and OD wood chip is 1:50 ~ 60, and the mass ratio of anthraquinone and OD wood chip is 1:1000 ~ 1500.
3. the pulping process of Eucalyptus high whiteness semi-chemical pulp according to claim 1, is characterized in that, in step 7, the addition of laccase is 20 ~ 25U/g over dry slurry.
4. the pulping process of Eucalyptus high whiteness semi-chemical pulp according to claim 1, it is characterized in that, in step 9, chlorine dioxide is 2 ~ 6% to the mass percent of over dry slurry.
5. the pulping process of the Eucalyptus high whiteness semi-chemical pulp according to claim 1 or 4, is characterized in that, in step 9, bleaching processes 120 ~ 150min at 80 ~ 90 DEG C.
6. the pulping process of Eucalyptus high whiteness semi-chemical pulp according to claim 1, is characterized in that, in step 10, hydrogen peroxide is 3 ~ 5%, NaOH to the mass percent of over dry slurry is 2%, Na to the mass percent of over dry slurry 2siO 3be 3% to the mass percent of over dry slurry.
7. the pulping process of the Eucalyptus high whiteness semi-chemical pulp according to claim 1 or 6, is characterized in that, in step 10, bleaching processes 120 ~ 150min at temperature is 80 ~ 90 DEG C.
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CN105332308A (en) * 2015-09-24 2016-02-17 安徽农业大学 Method for preparing nanocellulose papermaking auxiliary agent with waste newspaper or waste electrostatic copy paper as raw material
CN111501392A (en) * 2020-06-09 2020-08-07 吴袖福 Pollution-free production process and production equipment of plant fiber paper pulp
CN112342814A (en) * 2020-11-19 2021-02-09 横县东糖糖业有限公司纸业分公司 Method for producing high-strength natural-color paper pulp by taking eucalyptus bark as raw material
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Publication number Priority date Publication date Assignee Title
CN105332308A (en) * 2015-09-24 2016-02-17 安徽农业大学 Method for preparing nanocellulose papermaking auxiliary agent with waste newspaper or waste electrostatic copy paper as raw material
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CN112342814A (en) * 2020-11-19 2021-02-09 横县东糖糖业有限公司纸业分公司 Method for producing high-strength natural-color paper pulp by taking eucalyptus bark as raw material
CN112458778A (en) * 2020-11-23 2021-03-09 山东太阳纸业股份有限公司 Process for industrially preparing semi-chemical pulp by taking wood chips as raw materials
CN112458778B (en) * 2020-11-23 2022-04-26 山东太阳纸业股份有限公司 Process for industrially preparing semi-chemical pulp by taking wood chips as raw materials

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