CN108179647A - A kind of micro- drift softwood pulp preparation method of no chlorine - Google Patents
A kind of micro- drift softwood pulp preparation method of no chlorine Download PDFInfo
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- CN108179647A CN108179647A CN201810161399.XA CN201810161399A CN108179647A CN 108179647 A CN108179647 A CN 108179647A CN 201810161399 A CN201810161399 A CN 201810161399A CN 108179647 A CN108179647 A CN 108179647A
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- 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
- D21C3/00—Pulping cellulose-containing materials
- D21C3/02—Pulping cellulose-containing materials with inorganic bases or alkaline reacting compounds, e.g. sulfate processes
- D21C3/022—Pulping cellulose-containing materials with inorganic bases or alkaline reacting compounds, e.g. sulfate processes in presence of S-containing 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
- D21C3/00—Pulping cellulose-containing materials
- D21C3/02—Pulping cellulose-containing materials with inorganic bases or alkaline reacting compounds, e.g. sulfate processes
- D21C3/026—Pulping cellulose-containing materials with inorganic bases or alkaline reacting compounds, e.g. sulfate processes in presence of O2, e.g. air
-
- 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
- D21C3/00—Pulping cellulose-containing materials
- D21C3/22—Other features of pulping processes
- D21C3/222—Use of compounds accelerating the pulping 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
- D21C5/00—Other processes for obtaining cellulose, e.g. cooking cotton linters ; Processes characterised by the choice of cellulose-containing starting materials
- D21C5/005—Treatment of cellulose-containing material with microorganisms or enzymes
-
- 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
- D21C9/16—Bleaching ; Apparatus therefor with per compounds
- D21C9/163—Bleaching ; Apparatus therefor with per compounds with peroxides
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Biochemistry (AREA)
- Microbiology (AREA)
- Paper (AREA)
Abstract
The present invention provides a kind of no chlorine micro- drift softwood pulp preparation method, belongs to slurry preparation field, this method first passes through DDS displacement cooking production technologies, dissolve out lignin using needlebush as raw material；It carries out one section of oxygen to slurry obtained by DDS displacement cookings later to take off, softening fibre, abjection lignin；Take off finally by two sections of oxygen+biological enzyme helps drift to be handled, the LCC connecting keys between lignin degrading and carbohydrate, degradation digestion process adsorbs and is deposited in again the xylan of fiber surface, destroys the coloured groups in lignin structure.The present invention uses DDS displacement cookings production technology, is equipped with the micro- drift technology production environmental protection slurry of OAB+ biological enzyme, produces product and had not only accomplished that micro- drift was changed colour, but also realization is without chlorine.The high-end product of the alternative import of kind produced using the environmentally friendly natural color pulp of the micro- drift of no chlorine, all indexs reach outlet EU criteria, available for producing high-grade wrapping paper, industrial and technical paper and true qualities or primary colors paper for daily use.
Description
Technical field
The present invention relates to slurry preparing technical field, specifically a kind of micro- drift softwood pulp preparation method of no chlorine.
Background technology
Association with pulp bleaching is the important procedure of pulping process, the purpose is to improve the brightness of wood pulp, to adapt to different paper
It is required that.The raw material of papermaking is mainly timber, in timber in addition to containing cellulose, also containing considerable lignin.In lignin both
Containing a certain amount of chromophoric group, and there are considerable active reaction position, in bleaching process, except a certain amount of color is rolled into a ball not
Outside being destroyed, certain active reactive groups can also convert quality group.Therefore, the presence of lignin largely constrains paper
Pulp brightness and its bleachability.
Delignification's bleaching is the major way of association with pulp bleaching.Traditional delignification's bleaching is mainly using hypochlorite as drift
White agent is usually combined progress multistage drift, a large amount of organic halogenation is generated in this bleaching method waste liquid with chlorination, alkali process
Object, environmental pollution are larger.
Invention content
The technical assignment of the present invention is in view of the deficiencies of the prior art, to provide a kind of no chlorine micro- drift softwood pulp preparation side
Method, solving in the prior art has chlorine bleaching to bring problem of environmental pollution.
This method using DDS displacement cookings production technology, is equipped with the micro- drift technology life of OAB+ biological enzyme using needlebush as raw material
Production environmental protection slurry, thoroughly changes the color and luster of original natural color pulp, accomplishes not only micro- drift, but also accomplish no chlorine, the paper generation made with environmental protection slurry
For the high-end product of external import, all indexs reach outlet EU criteria.
First, DDS replacing and digesting technoloys, be researched and developed on the basis of RDH (Rapid replacement boiling) Batch Cooking Technology it is new
Technology thoroughly eliminates odor pollution, reduces steam consumption, reduces sewage discharge load, improves product quality, energy saving and environmentally friendly effect
Fruit is notable.
Second, the micro- drift technologies of OAB, to realize without the micro- drift of chlorine, add in oxygen and alkali carry out softening fibre, abjection lignin.
Third, biological enzyme helps drift technology, the brightness of slurry and the requirement of part paper kind is not achieved by the micro- drift technologies of OAB merely,
With reference to biological enzyme technology, biological enzyme adds in the optionally connecting key between lignin degrading and snoozed compound, destroys
LCC structures, degradation digestion process adsorb and are deposited in again the xylan of fiber surface, destroy phenolic hydroxyl group and purple in lignin structure
Cloves base group, while without destroying cellulose chemistry structure, increase interfibrous gap, play the role of bleaching.
The technical solution adopted by the present invention to solve the technical problems is：
A kind of micro- drift softwood pulp preparation method of no chlorine, this method using needlebush as raw material,
DDS displacement cooking production technologies are first passed through, dissolve out lignin；
It carries out one section of oxygen to slurry obtained by DDS displacement cookings later to take off, softening fibre, abjection lignin；
Take off finally by two sections of oxygen+biological enzyme helps drift to be handled, the LCC between lignin degrading and carbohydrate connects
Key is connect, degradation digestion process adsorbs and is deposited in again the xylan of fiber surface, destroys the coloured groups in lignin structure.
It is further improved as the present invention, it is as follows including step using needlebush as raw material：
1) wood chip takes out after screening, washing, presoak process, and the wood chip for presoaking after-tack is sent into cooking process, is made
Lignin dissolution in wood chip；
Cooking process carries out boiling using DDS displacement cookings production technology, in boiling medicine used in chip steaming process
Liquid accounts for the 2%-3%wt of over dry raw material, and as digestion process carries out, cooking liquor is sent into digester stage by stage；
2) slurry after boiling is washed, retains fiber, waste liquid is separated off from slurry, the slurry after washing
Purified, screening isolates completely slurry not the steaming of non-boiling and solves object and impurity；
3) slurry purified, after screening is sent into one section of oxygen and takes off process, and sodium hydroxide, oxygen are added in one section of oxygen takes off tower
One section of oxygen delignification is carried out, wherein, sodium hydroxide concentration accounts for the 1.0%-2.0%wt of oven dry stock, and flow of oxygen accounts for oven dry stock
1.0%-2.0%wt；
4) slurry after one section of oxygen takes off is sent into two sections of oxygen and takes off process, added in medium-consistency pulp mixer sodium hydroxide, oxygen,
Hydrogen peroxide promotees drift enzyme, scale inhibitor, chelating agent two sections of oxygen delignifications of progress, wherein, sodium hydroxide concentration accounts for oven dry stock
0.8%-1.0%wt, flow of oxygen account for the 1.0%-1.5%wt of oven dry stock, and hydrogen peroxide use accounts for the 1%-2% of oven dry stock
Wt, promotees the 0.01%-0.04%wt that drift enzyme dosage accounts for oven dry stock, and scale inhibitor dosage accounts for the 0.05%-0.08%wt of oven dry stock, chela
Mixture dosage accounts for the 0.02%-0.04%wt of oven dry stock；
5) two sections of oxygen of slurry are washed after taking off, are dehydrated concentration, conveying storage.
Further improved as the present invention, DDS displacement cookings production technology includes the following steps in step 1)：
A) heat preservation is risen in digestion process, first low temperature black liquor in digester is warming up into line replacement with warm black liquor and hot black liquor
, 170~172 DEG C of boiling maximum temperature is steam heated to 0.8MPa later and is kept the temperature, rise preservation and controlling and exist by 156~163 DEG C
100-120 minutes；
B) after rising heat preservation, start with low temperature black liquor to hot black liquor in digester into line replacement, according to temperature by height to
It is low to sequentially enter hot black liquor slot, warm black liquor slot and accumulator tank, until boiling kettle temperature is down to 100 DEG C hereinafter, this process 30-
40 minutes.
Further improved as the present invention, the composition of cooking liquor described in step 1) is：16%-20%wt hydroxides
Sodium, 5%-8%wt vulcanized sodium, auxiliary agent A 0.02%-0.05%wt, auxiliary agent B 0.05%-0.08%wt.
Wherein, for the non-fibers such as sodium hydroxide, vulcanized sodium and the lignin in fibrous material by being reacted with liquid, generation is molten
In the compound of cooking liquor, so as to by being removed in fiber, dissociate fiber.
Further improved as the present invention, auxiliary agent A is dispersant, and effect is to reduce the surface tension of cooking liquor,
Cooking liquor is made to be evenly distributed on wood chip surface, medicinal liquid osmosis is helped, such as cellulose derivative, fatty acid polyethylene glycol ester, helps
Agent B is catalyst, and effect is digesting assistant, promotes lignin dissolution and protection fiber, such as anthraquinone and its derivative.
Further improved as the present invention, it is biological enzyme to promote drift enzyme in step 4), and effect is to promote lignin dissolution drop
Low starch degree, such as xylose alcoholase, hemicellulase, scale inhibitor effect is to prevent the deposit including calcium oxalate from being formed, such as
Organic phosphate, chelating agent are a kind of screening agent, and effect is to cover heavy metal ion, such as organic phosphoric acid, polycarboxylic acids compound.
Further improved as the present invention, in step 1), DDS displacement cooking production technologies include：
1. filling pot LC, adding in 2.0%~3.0%wt of alkali, (to cooking liquor, it is sodium hydroxide and vulcanization to add in alkali number proportion
The sum of sodium, similarly hereinafter), temperature is 70~80 DEG C；
2. primary boiling IC adds in alkali number 4.0%-4.3%wt, temperature is 128~133 DEG C, while adds in auxiliary agent A addition
Measure is 0.3kg/ tons；
3. intermediate boiling MC adds in surplus alkali, temperature is 156~163 DEG C, while adds in auxiliary agent B, addition 0.5kg/
Ton；
4. rising heat preservation FC, 172 DEG C are heated to 0.8MPa live steams, starts to keep the temperature, the boiling H factors reach 1550
Heat preservation is risen to terminate；
5. recycling displacement RC, hot black liquor in boiling is cemented out with low temperature black liquor, make kettle temperature be down to 100 DEG C with
Under；
6. putting a pot DC, slurry in pot is sent to spraying pot using pot pump is put.
A kind of no chlorine of the present invention is micro- to float softwood pulp preparation method, compared with prior art generated advantageous effect
It is：
The present invention uses DDS displacement cookings production technology, is equipped with the micro- drift technology production environmental protection slurry of OAB+ biological enzyme, is produced
Product had not only accomplished that micro- drift was changed colour, but also is realized without chlorine.The height of the alternative import of kind produced using the environmentally friendly natural color pulp of the micro- drift of no chlorine
Product is held, all indexs reach outlet EU criteria.Product can be used for the high-grade wrapping paper of production, industrial and technical paper and true qualities or
Primary colors paper for daily use.
Specific embodiment
A kind of no micro- drift softwood pulp preparation method of chlorine of the present invention is described in detail below below.
Embodiment one
A kind of no micro- drift softwood pulp preparation method of chlorine of the present invention is as follows including step using needlebush as raw material：
1) wood chip takes out after screening, washing, presoak process, and the wood chip for presoaking after-tack is sent into cooking process, is made
Lignin dissolution in wood chip；【Soften after being presoaked due to wood chip, can promote wood chip is more loose to dredge, be impregnated with conducive to cooking liquor
Inside wood chip, so as to shorten mixing time, sieving rate is reduced.】
Cooking process carries out boiling using DDS displacement cookings production technology, in boiling medicine used in chip steaming process
Liquid accounts for the 2%wt of over dry raw material, and as digestion process carries out, cooking liquor is sent into digester stage by stage；
Involved cooking liquor forms：16%wt sodium hydroxides, 5%wt vulcanized sodium, auxiliary agent A 0.03%wt, auxiliary agent B
For 0.05%wt, wherein；
Auxiliary agent A is cellulose derivative, and as dispersant, effect is to reduce the surface tension of cooking liquor, makes boiling
Liquid is evenly distributed on wood chip surface, helps medicinal liquid osmosis.Auxiliary agent B is anthraquinone, and as catalyst, effect is digesting assistant,
Promote lignin dissolution and protection fiber.
DDS displacement cooking production technologies include the following steps：
1. pot LC is filled, addition alkali 2.0%wt (to cooking liquor, alkali number proportion is added in as the sum of sodium hydroxide and vulcanized sodium,
Similarly hereinafter), temperature is 70 DEG C；
2. primary boiling IC adds in alkali number 4.0%wt, temperature is 133 DEG C, while adds in auxiliary agent A addition as 0.3kg/
Ton；
3. intermediate boiling MC adds in surplus alkali, temperature is 156 DEG C, while adds in auxiliary agent B, and addition is 0.5kg/ tons；
Step 1. -3. middle heated up using warm black liquor and hot black liquor to low temperature black liquor in digester into line replacement control；
4. rising heat preservation FC, 172 DEG C are heated to 0.8MPa live steams, starts to keep the temperature, rise preservation and controlling at 100 points
Clock, the boiling H factors reach 1550 liters of heat preservations and terminate；
5. recycling displacement RC, hot black liquor in boiling is cemented out with low temperature black liquor, according to temperature from high to low successively into
Enter hot black liquor slot, warm black liquor slot and accumulator tank, kettle temperature is made to be down to 100 DEG C hereinafter, this process 30 minutes；
6. putting a pot DC, slurry in pot is sent to spraying pot using pot pump is put.
2) slurry after boiling is washed, retains fiber, waste liquid is separated off from slurry, waste liquid is sent to recycling
System recycles, and prevents from polluting, and the slurry after washing is purified, screening, isolate non-boiling it is completely slurry do not steam solution object and miscellaneous
Matter；
For softwood pulp, if not steaming solution owner without well-done wooden unit, impurity is mainly sandstone, metal object
Deng；
3) slurry purified, after screening is sent into one section of oxygen and takes off process, and sodium hydroxide, oxygen are added in one section of oxygen takes off tower
Carry out one section of oxygen delignification：Wherein, sodium hydroxide concentration accounts for the 1.0%wt of oven dry stock, and flow of oxygen accounts for the 1.0% of oven dry stock
wt；
4) slurry after one section of oxygen takes off is sent into two sections of oxygen and takes off process, added in medium-consistency pulp mixer sodium hydroxide, oxygen,
Hydrogen peroxide promotees drift enzyme, scale inhibitor, chelating agent two sections of oxygen delignifications of progress, wherein, sodium hydroxide concentration accounts for oven dry stock
0.8%wt, flow of oxygen account for the 1.0%wt of oven dry stock, and hydrogen peroxide use accounts for the 1%wt of oven dry stock, rush drift enzyme dosage accounts for absolutely
The 0.01%wt of dry pulp, scale inhibitor dosage account for the 0.05%%wt of oven dry stock, amount of chelant accounts for the 0.02%%wt of oven dry stock；
It is xylose alcoholase to promote drift enzyme, and as biological enzyme, effect is that lignin dissolution is promoted to reduce starch degree.Scale inhibitor is has
Machine phosphate, effect is to prevent the deposit including calcium oxalate from being formed.Chelating agent is organic phosphoric acid, as screening agent,
Its effect is to cover heavy metal ion.
5) two sections of oxygen of slurry are washed after taking off, are dehydrated concentration, conveying storage.
In the present invention, oxygen delignification is using remaining most of lignin after alkali and oxygen removing boiling.
Comparative example is the softwood pulp preparation method of the prior art, and using needlebush as raw material, method is：RDH sulfate
Method boiling+hypochlorite bleaching.
Embodiment two
A kind of no micro- drift softwood pulp preparation method of chlorine of the present invention is as follows including step using needlebush as raw material：
1) wood chip takes out after screening, washing, presoak process, and the wood chip for presoaking after-tack is sent into cooking process, is made
Lignin dissolution in wood chip；【Soften after being presoaked due to wood chip, can promote wood chip is more loose to dredge, be impregnated with conducive to cooking liquor
Inside wood chip, so as to shorten mixing time, sieving rate is reduced.】
Cooking process carries out boiling using DDS displacement cookings production technology, in boiling medicine used in chip steaming process
Liquid accounts for the 2.5%wt of over dry raw material, and as digestion process carries out, cooking liquor is sent into digester stage by stage；
Involved cooking liquor forms：18%wt sodium hydroxides, 7%wt vulcanized sodium, auxiliary agent A 0.02%wt, auxiliary agent B
For 0.07%wt, wherein；
Auxiliary agent A is fatty acid polyethylene glycol ester, and as dispersant, effect is to reduce the surface tension of cooking liquor, is made
Cooking liquor is evenly distributed on wood chip surface, helps medicinal liquid osmosis.Auxiliary agent B is anthraquinone derivative, and as catalyst, effect is
Digesting assistant promotes lignin dissolution and protection fiber.
DDS displacement cooking production technologies include the following steps：
1. pot LC is filled, addition alkali 2.5%wt (to cooking liquor, alkali number proportion is added in as the sum of sodium hydroxide and vulcanized sodium,
Similarly hereinafter), temperature is 75 DEG C；
2. primary boiling IC adds in alkali number 4.3%wt, temperature is 128 DEG C, while adds in auxiliary agent A addition as 0.2kg/
Ton；
3. intermediate boiling MC adds in surplus alkali, temperature is 160 DEG C, while adds in auxiliary agent B, and addition is 0.7kg/ tons；
Step 1. -3. middle heated up using warm black liquor and hot black liquor to low temperature black liquor in digester into line replacement control；
4. rising heat preservation FC, 170 DEG C are heated to 0.8MPa live steams, starts to keep the temperature, rise preservation and controlling at 110 points
Clock, the boiling H factors reach 1550 liters of heat preservations and terminate；
5. recycling displacement RC, hot black liquor in boiling is cemented out with low temperature black liquor, according to temperature from high to low successively into
Enter hot black liquor slot, warm black liquor slot and accumulator tank, kettle temperature is made to be down to 100 DEG C hereinafter, this process 35 minutes；
6. putting a pot DC, slurry in pot is sent to spraying pot using pot pump is put.
2) slurry after boiling is washed, retains fiber, waste liquid is separated off from slurry, waste liquid is sent to recycling
System recycles, and prevents from polluting, and the slurry after washing is purified, screening, isolate non-boiling it is completely slurry do not steam solution object and miscellaneous
Matter；
For softwood pulp, if not steaming solution owner without well-done wooden unit, impurity is mainly sandstone, metal object
Deng；
3) slurry purified, after screening is sent into one section of oxygen and takes off process, and sodium hydroxide, oxygen are added in one section of oxygen takes off tower
Carry out one section of oxygen delignification：Wherein, sodium hydroxide concentration accounts for the 1.5%wt of oven dry stock, and flow of oxygen accounts for the 1.5% of oven dry stock
wt；
4) slurry after one section of oxygen takes off is sent into two sections of oxygen and takes off process, added in medium-consistency pulp mixer sodium hydroxide, oxygen,
Hydrogen peroxide promotees drift enzyme, scale inhibitor, chelating agent two sections of oxygen delignifications of progress, wherein, sodium hydroxide concentration accounts for oven dry stock
0.9%wt, flow of oxygen account for the 1.2%wt of oven dry stock, and hydrogen peroxide use accounts for the 1.5%wt of oven dry stock, rush drift enzyme dosage accounts for
The 0.03%wt of oven dry stock, scale inhibitor dosage account for the 0.06%wt of oven dry stock, amount of chelant accounts for the 0.03%wt of oven dry stock；
It is hemicellulase to promote drift enzyme, and as biological enzyme, effect is that lignin dissolution is promoted to reduce starch degree.Scale inhibitor is
Organic phosphate, effect is to prevent the deposit including calcium oxalate from being formed.Chelating agent is polycarboxylic acids compound, as covering
Agent is covered, effect is to cover heavy metal ion.
5) two sections of oxygen of slurry are washed after taking off, are dehydrated concentration, conveying storage.
In the present invention, oxygen delignification is using remaining most of lignin after alkali and oxygen removing boiling.
Embodiment three
A kind of no micro- drift softwood pulp preparation method of chlorine of the present invention is as follows including step using needlebush as raw material：
1) wood chip takes out after screening, washing, presoak process, and the wood chip for presoaking after-tack is sent into cooking process, is made
Lignin dissolution in wood chip；【Soften after being presoaked due to wood chip, can promote wood chip is more loose to dredge, be impregnated with conducive to cooking liquor
Inside wood chip, so as to shorten mixing time, sieving rate is reduced.】
Cooking process carries out boiling using DDS displacement cookings production technology, in boiling medicine used in chip steaming process
Liquid accounts for the 3%wt of over dry raw material, and as digestion process carries out, cooking liquor is sent into digester stage by stage；
Involved cooking liquor forms：20%wt sodium hydroxides, 8%wt vulcanized sodium, auxiliary agent A 0.05%wt, auxiliary agent B
For 0.08%wt, wherein；
Auxiliary agent A is cellulose derivative, the mixture of fatty acid polyethylene glycol ester, and as dispersant, effect is to reduce
The surface tension of cooking liquor makes cooking liquor be evenly distributed on wood chip surface, helps medicinal liquid osmosis.Auxiliary agent B for anthraquinone and its
The mixture of derivative, as catalyst, effect is digesting assistant, promotes lignin dissolution and protection fiber.
DDS displacement cooking production technologies include the following steps：
1. pot LC is filled, addition alkali 3.0%wt (to cooking liquor, alkali number proportion is added in as the sum of sodium hydroxide and vulcanized sodium,
Similarly hereinafter), temperature is 80 DEG C；
2. primary boiling IC adds in alkali number 4.2%wt, temperature is 130 DEG C, while adds in auxiliary agent A addition as 0.5kg/
Ton；
3. intermediate boiling MC adds in surplus alkali, temperature is 163 DEG C, while adds in auxiliary agent B, and addition is 0.8kg/ tons；
Step 1. -3. middle heated up using warm black liquor and hot black liquor to low temperature black liquor in digester into line replacement control；
4. rising heat preservation FC, 171 DEG C are heated to 0.8MPa live steams, starts to keep the temperature, rise preservation and controlling at 110 points
Clock, the boiling H factors reach 1550 liters of heat preservations and terminate；
5. recycling displacement RC, hot black liquor in boiling is cemented out with low temperature black liquor, according to temperature from high to low successively into
Enter hot black liquor slot, warm black liquor slot and accumulator tank, kettle temperature is made to be down to 100 DEG C hereinafter, this process 40 minutes；
6. putting a pot DC, slurry in pot is sent to spraying pot using pot pump is put.
2) slurry after boiling is washed, retains fiber, waste liquid is separated off from slurry, waste liquid is sent to recycling
System recycles, and prevents from polluting, and the slurry after washing is purified, screening, isolate non-boiling it is completely slurry do not steam solution object and miscellaneous
Matter；
For softwood pulp, if not steaming solution owner without well-done wooden unit, impurity is mainly sandstone, metal object
Deng；
3) slurry purified, after screening is sent into one section of oxygen and takes off process, and sodium hydroxide, oxygen are added in one section of oxygen takes off tower
Carry out one section of oxygen delignification：Wherein sodium hydroxide concentration accounts for the 2.0%wt of oven dry stock, and flow of oxygen accounts for the 2.0%wt of oven dry stock；
4) slurry after one section of oxygen takes off is sent into two sections of oxygen and takes off process, added in medium-consistency pulp mixer sodium hydroxide, oxygen,
Hydrogen peroxide promotees drift enzyme, scale inhibitor, chelating agent two sections of oxygen delignifications of progress, wherein, sodium hydroxide concentration accounts for oven dry stock
1.0%wt, flow of oxygen account for the 1.5%wt of oven dry stock, and hydrogen peroxide use accounts for the 2%wt of oven dry stock, rush drift enzyme dosage accounts for absolutely
The 0.04%wt of dry pulp, scale inhibitor dosage account for the 0.08%wt of oven dry stock, amount of chelant accounts for the 0.04%wt of oven dry stock；
Promote drift enzyme as xylose alcoholase, the mixture of hemicellulase, as biological enzyme, effect is to promote lignin dissolution drop
Low starch degree.Scale inhibitor is organic phosphate, and effect is to prevent the deposit including calcium oxalate from being formed.Chelating agent is has
The mixture of machine phosphoric acid, polycarboxylic acids compound, as screening agent, effect is to cover heavy metal ion.
5) two sections of oxygen of slurry are washed after taking off, are dehydrated concentration, conveying storage.
In the present invention, oxygen delignification is using remaining most of lignin after alkali and oxygen removing boiling.
Although the preferred embodiment of the application has been described, those skilled in the art once know basic creation
Property concept, then additional changes and modifications may be made to these embodiments.So appended claims be intended to be construed to include it is excellent
It selects embodiment and falls into all change and modification of the application range.
Obviously, those skilled in the art can carry out the application essence of the various modification and variations without departing from the application
God and range.In this way, if these modifications and variations of the application belong to the range of the application claim and its equivalent technologies
Within, then the application is also intended to include these modifications and variations.
It is the known technology of those skilled in the art in addition to the technical characteristic described in specification.
Claims (7)
1. a kind of micro- drift softwood pulp preparation method of no chlorine, which is characterized in that this method using needlebush as raw material,
DDS displacement cooking production technologies are first passed through, dissolve out lignin；
It carries out one section of oxygen to slurry obtained by DDS displacement cookings later to take off, softening fibre, abjection lignin；
Take off finally by two sections of oxygen+biological enzyme helps drift to be handled, the LCC connections between lignin degrading and carbohydrate
Key, degradation digestion process adsorb and are deposited in again the xylan of fiber surface, destroy the coloured groups in lignin structure.
2. a kind of no micro- drift softwood pulp preparation method of chlorine according to claim 1, which is characterized in that using needlebush as original
Material, it is as follows including step：
1) wood chip takes out after screening, washing, presoak process, and the wood chip for presoaking after-tack is sent into cooking process；
Cooking process carries out boiling using DDS displacement cookings production technology, in cooking liquor alkali used in chip steaming process
The 2%-3%wt of over dry raw material is accounted for, as digestion process carries out, cooking liquor is sent into digester stage by stage；
2) slurry after boiling is washed, retains fiber, waste liquid is separated off from slurry, the slurry after washing is through net
Change, screening, isolate completely slurry not the steaming of non-boiling and solve object and impurity；
3) slurry purified, after screening is sent into one section of oxygen and takes off process, sodium hydroxide is added in one section of oxygen takes off tower, oxygen carries out
One section of oxygen delignification, wherein, sodium hydroxide concentration accounts for the 1.0%-2.0%wt of oven dry stock, and flow of oxygen accounts for oven dry stock
1.0%-2.0%wt；
4) slurry two sections of oxygen of feeding after one section of oxygen takes off take off process, and sodium hydroxide, oxygen, peroxide are added in medium-consistency pulp mixer
Change hydrogen, promote drift enzyme, scale inhibitor, chelating agent two sections of oxygen delignifications of progress, wherein, sodium hydroxide concentration accounts for the 0.8%- of oven dry stock
1.0%wt, flow of oxygen account for the 1.0%-1.5%wt of oven dry stock, and hydrogen peroxide use accounts for the 1%-2%wt of oven dry stock, promotees drift
Enzyme dosage accounts for the 0.01%-0.04%wt of oven dry stock, and scale inhibitor dosage accounts for the 0.05%-0.08%wt of oven dry stock, and chelating agent is used
Amount accounts for the 0.02%-0.04%wt of oven dry stock；
5) two sections of oxygen of slurry are washed after taking off, are dehydrated concentration, conveying storage.
A kind of 3. no micro- drift softwood pulp preparation method of chlorine according to claim 2, which is characterized in that DDS in step 1)
Displacement cooking production technology includes the following steps：
A) heat preservation is risen in digestion process, 156 first are warming up into line replacement to low temperature black liquor in digester with warm black liquor and hot black liquor
~163 DEG C, 170~172 DEG C of boiling maximum temperature is steam heated to 0.8MPa later, is kept the temperature, risen preservation and controlling and exist
100-120 minutes；
B) after rising heat preservation, start with low temperature black liquor to hot black liquor in digester into line replacement, according to temperature from high to low according to
It is secondary to enter hot black liquor slot, warm black liquor slot and accumulator tank, until boiling kettle temperature is down to 100 DEG C hereinafter, 30-40 points of this process
Clock.
4. a kind of no micro- drift softwood pulp preparation method of chlorine according to Claims 2 or 3, which is characterized in that in step 1)
The cooking liquor forms：16%-20%wt sodium hydroxides, 5%-8%wt vulcanized sodium, auxiliary agent A 0.02%-0.05%
Wt, auxiliary agent B 0.05%-0.08%wt.
5. a kind of no micro- drift softwood pulp preparation method of chlorine according to claim 4, which is characterized in that auxiliary agent A is dispersion
Agent, including cellulose derivative, fatty acid polyethylene glycol ester, auxiliary agent B is catalyst, including anthraquinone and its derivative.
6. a kind of no micro- drift softwood pulp preparation method of chlorine according to claim 2 or 5, which is characterized in that in step 4)
It is biological enzyme to promote drift enzyme, and including xylose alcoholase, hemicellulase, scale inhibitor is organic phosphate, and chelating agent is a kind of screening agent,
Including organic phosphoric acid, polycarboxylic acids compound.
7. a kind of no micro- drift softwood pulp preparation method of chlorine according to claim 4, which is characterized in that in step 1), DDS
Displacement cooking production technology includes：
1. filling pot LC, 2.0%~3.0%wt of alkali is added in, adds in alkali number proportion as the sum of sodium hydroxide and vulcanized sodium, temperature 70
~80 DEG C；
2. primary boiling IC adds in alkali number 4.0%-4.3%wt, temperature is 128~133 DEG C, while adds in auxiliary agent A addition and be
0.3kg/ tons；
3. intermediate boiling MC adds in surplus alkali, temperature is 156~163 DEG C, while adds in auxiliary agent B, and addition is 0.5kg/ tons；
4. rising heat preservation FC, 172 DEG C are heated to 0.8MPa live steams, starts to keep the temperature, the boiling H factors reach 1550 liters of guarantors
Temperature terminates；
5. recycling displacement RC, hot black liquor in boiling is cemented out, kettle temperature is made to be down to less than 100 DEG C with low temperature black liquor；
6. putting a pot DC, slurry in pot is sent to spraying pot using pot pump is put.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112160180A (en) * | 2020-09-15 | 2021-01-01 | 内蒙古林乐生物能源有限责任公司 | Production process of biochemical mechanical pulp |
| CN112911977A (en) * | 2018-11-30 | 2021-06-04 | 大王制纸株式会社 | Toilet paper |
| CN113330158A (en) * | 2019-03-06 | 2021-08-31 | 大王制纸株式会社 | Toilet paper |
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| WO2010135594A1 (en) * | 2009-05-20 | 2010-11-25 | Alco Fiber Llc | Continuous tube reactor |
| CN102121201A (en) * | 2010-11-22 | 2011-07-13 | 福建农林大学 | Preparation method of bamboo dissolving pulp |
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Cited By (4)
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| CN112911977A (en) * | 2018-11-30 | 2021-06-04 | 大王制纸株式会社 | Toilet paper |
| CN113330158A (en) * | 2019-03-06 | 2021-08-31 | 大王制纸株式会社 | Toilet paper |
| CN113330158B (en) * | 2019-03-06 | 2022-11-15 | 大王制纸株式会社 | Toilet paper |
| CN112160180A (en) * | 2020-09-15 | 2021-01-01 | 内蒙古林乐生物能源有限责任公司 | Production process of biochemical mechanical pulp |
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