CN109403115A - A method of vinegar-grade dissolving pulp is produced using poplar slab - Google Patents

A method of vinegar-grade dissolving pulp is produced using poplar slab Download PDF

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Publication number
CN109403115A
CN109403115A CN201811228170.XA CN201811228170A CN109403115A CN 109403115 A CN109403115 A CN 109403115A CN 201811228170 A CN201811228170 A CN 201811228170A CN 109403115 A CN109403115 A CN 109403115A
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dosage
oven dry
dry stock
stock quality
temperature
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CN109403115B (en
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吴朝军
于冬梅
李荣刚
王东
李书平
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Qilu University of Technology
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Qilu University of Technology
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Priority to CN201811228170.XA priority Critical patent/CN109403115B/en
Priority to PCT/CN2018/114525 priority patent/WO2020082427A1/en
Priority to US16/314,319 priority patent/US20200173103A1/en
Publication of CN109403115A publication Critical patent/CN109403115A/en
Priority to BE20195709A priority patent/BE1026675B1/en
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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
    • 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
    • D21C3/22—Other features of 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
    • D21C1/00—Pretreatment of the finely-divided materials before digesting
    • D21C1/02—Pretreatment of the finely-divided materials before digesting with water or steam
    • 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
    • D21C3/003—Pulping cellulose-containing materials with organic 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
    • D21C3/006—Pulping cellulose-containing materials with compounds not otherwise provided for
    • 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
    • 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
    • D21C9/1005—Pretreatment of the pulp, e.g. degassing the pulp

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  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Biochemistry (AREA)
  • Microbiology (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Inorganic Chemistry (AREA)
  • Paper (AREA)

Abstract

The present invention relates to dissolving pulp preparation technical field, in particular to a kind of method using poplar slab production vinegar-grade dissolving pulp: addition auxiliary agent prehydrolysis；I section of Soda/AQ boiling；II section of Soda/AQ boiling；OPDQEPP bleaching；Enzyme collaboration processing.It is prepared for the poplar slab vinegar-grade dissolving pulp of high-purity and high reaction activity；Chemicals clean and environmental protection used, production technology cleaning.

Description

A method of vinegar-grade dissolving pulp is produced using poplar slab
Technical field
The present invention relates to dissolving pulp preparation technical fields, in particular to a kind of to produce vinegar-grade dissolving pulp using poplar slab Method.
Background technique
Currently, nearly 1,000,000 tons of cellulose acetate yield in the world, and China produces nearly 400,000 tons of cellulose acetate per year, year consumes vinegar-grade About 300,000 tons of the wooden dissolving pulp, vinegar-grade dissolving pulp is mainly used to prepare Triafol T and cellulose diacetate, in dissolving pulp Hydroxyl almost acetylation on cellulose glucose unit on 2,3,6 three positions, obtaining Triafol T, (degree of substitution is > 2.7), Triafol T hydrolyzes to obtain cellulose diacetate (degree of substitution 2.4-2.6), and reaction process is shown below.
Triafol T is widely used in film, liquid crystal display polarizing coating, reverse osmosis membrane etc., and cellulose diacetate is wide It is general to apply to cigaratte filter, plastic products etc..Cellulose acetate has higher requirement to its raw material-vinegar-grade dissolving pulp, i.e., high Purity and high reaction activity, currently, China can only prepare vinegar-grade Cotton Pulp, and the vinegar-grade of high-purity, high reaction activity The wooden dissolving pulp relies primarily on import.
Be both at home and abroad that raw material prepare vinegar-grade dissolving pulp using timber, technique generally use prehydrolysis+sulphate cook+ ECF bleaching process or acid accumulator sulfite boiling+ECF bleaching+cold alkali density technique, in order to improve going for prehydrolysis hemicellulose Except rate, inorganic acid or organic acid are usually added, which increase the corrosivity of equipment.In order to improve delignification rate, some researchers Using the KP method boiling technology of high curing degree, but high sulphidity is also easy to produce the foul smell such as methyl mercaptan, dimethyl sulphide；It is molten in order to reduce The ash content of slurry is solved, dissolving pulp manufacturing enterprise will carry out sour processing after paper pulp bleaching, but low pH value easily makes part in dissolving pulp Cellulose occurs acidic hydrolysis and drops poly-；In order to improve the alpha-cellulose content of vinegar-grade dissolving pulp, some scholars use cold alkali Extracting, but this can seriously reduce the reactivity ability of vinegar-grade dissolving pulp and aceticanhydride, some Egyptian scholar's microwave radiations and Highly concentrated zinc chloride handles vinegar-grade dissolving pulp to improve its reactivity, but technology also prematurity；United States Patent (USP) report Its purity is improved using strong acid treatment vinegar-grade dissolving pulp, but this technology pollution level is high, it is at high cost.Domestic Ye Youjisuo universities and colleges The positive research and development for carrying out this respect technology, mainly there is the units such as South China Science & Engineering University, Beijing Forestry University and Donghua University It is had made some progress in the research and development of the technology, is concentrated mainly on Eucalyptus, Acacia, pine and prepares vinegar-grade dissolution Slurry.
Poplar slab is cheap, raw material is sufficient as wood machining residues, it is reported that, the annual timber processing in China is surplus About 50,000,000 tons of the yield of excess, the one kind of poplar slab as wood machining residues, holocellulose content is about 82%, Wherein alpha-cellulose content is about 44%, will be to acetifying if producing high reaction activity vinegar-grade dissolving pulp by raw material of poplar slab The exploitation of grade dissolving pulp raw material is of great advantage.But both at home and abroad without the record for using poplar slab to prepare vinegar-grade dissolving pulp.
Summary of the invention
It is above in the prior art without the technological gap for using poplar slab to prepare vinegar-grade dissolving pulp, the application in order to solve Disclose a kind of method using poplar slab production vinegar-grade dissolving pulp.
It is selectively protected while hemicellulose in removing poplar slab raw material using the prehydrolysis technology of addition auxiliary agent Cellulose, and swollen fibrocyte are protected, then uses stage cooking, selectively removing lignin and hemicellulose, controls cellulose Drop is poly-, and slurry carries out hydrogen peroxide reinforced-oxygen bleaching/addition chelating agent ClO 2 bleaching/addition hydrogen peroxide after boiling Hot alkali extraction/hydrogen peroxide bleaching (OPDQEPP remaining lignin and hemicellulose) are removed, pulp brightness is improved and adjusts dissolution The degree of polymerization of slurry, to after drift slurry carry out biological enzyme collaboration processing further increase its acetify response value (PV value), reduce ash content and Methylene chloride (DCM) the extractives content.After this process, the purity and reactivity of vinegar-grade dissolving pulp are improved.
What the present invention was obtained through the following steps:
A method of vinegar-grade dissolving pulp is produced using poplar slab, comprising the following steps:
(1) add auxiliary agent prehydrolysis: liquor ratio 1:(4~10), hydrolysis additive dosage be poplar slab dry biomass 0.1~ 2.0%, 80~170 DEG C of hydrolysis temperature, soaking time 10~180 minutes, hydrolysis auxiliary agent was Boratex, magnesium sulfate, polyoxyethylene nonyl phenyl The mixture that ethylene ether phosphate and four sodium of iminodisuccinic acid are mixed to get according to mass ratio 1:1:1:1；
(2) I section of Soda/AQ boiling；
(3) II section of Soda/AQ boiling；
(4) OPDQEPP bleaching；
(5) enzyme collaboration is handled: slurry dense 2~10%, 30-50 DEG C of temperature, handles time 60min, pH=4.0~7.0, poly- asparagus fern ammonia Sour dosage is the 0.01%-1.0% of oven dry stock quality, and OP-13 dosage is the 0.001-0.01% of oven dry stock quality, OP-15 dosage For the 0.001-0.01% of oven dry stock quality, cellulose inscribe enzyme dosage is 0.1~0.6IU/gpulp, and zytase dosage is 2 ~4XU/gpulp, pectin enzyme dosage are 0.1~10 IU/gpulp.
It is preferred that I segment process condition of Soda/AQ boiling are as follows: with Na2O counts 5~15% that alkali charge is oven dry stock quality, liquor ratio 1:(3~8), magnesium hydroxide dosage be oven dry stock quality 0.5%, sodium sulfite dosage be oven dry stock quality 1.0~ 10.0%, AQ dosage be oven dry stock quality 0.05%, 80~120 DEG C of temperature, soaking time 10~180 minutes.
It is preferred that II segment process condition of Soda/AQ boiling are as follows: with Na2O counts 5~25% that alkali charge is oven dry stock quality, hydrogen-oxygen Change 0.5% that magnesium dosage is oven dry stock quality, sodium sulfite dosage is the 1.0~10.0% of oven dry stock quality, liquor ratio 1:(3~ 10), AQ dosage be oven dry stock quality 0.05%, 140~180 DEG C of temperature, soaking time 10~240 minutes.
It is preferred that OPDQEPP bleaching conditions are as follows: OPThe oxygen pressure of drift is 0.4~0.6Mpa, starches dense 10%, MgSO4Dosage is 0.6%, the NaOH dosage of oven dry stock quality is 1.0~3.0%, H of oven dry stock quality2O2Dosage be oven dry stock quality 0.5~ 3.0%, 70~110 DEG C of temperature, keep the temperature 60min..
It is preferred that OPDQEPP bleaching conditions are as follows: QD10~120 minutes reaction time of bleaching process, T=30 ± 2 DEG C, slurry Dense 2~8%, pH=1~3, sodium chlorite dosage are the 0.2-6.0% of oven dry stock quality, and IDS dosage is the 0.01 of oven dry stock quality ~1.0%.
It is preferred that OPDQEPP bleaching conditions are as follows: the 30~180min. of reaction time, MgSO of Ep extraction process4Dosage is 0.5%, the NaOH dosage of oven dry stock quality is the 0.5-5.0%, H of oven dry stock quality2O2Dosage is the 1.0- of oven dry stock quality 5.0%, IDS dosage are the 0.01~1.0% of oven dry stock quality, slurry dense 8%, 70~95 DEG C of temperature.
It is preferred that OPDQEPP bleaching conditions are as follows: the 60~180min. of reaction time, MgSO of P drift4Dosage is oven dry stock 0.5%, the NaOH dosage of quality is that 0.4%, the NaAC dosage of oven dry stock quality is 0.4%, H of oven dry stock quality2O2Dosage is The 1.0-5.0% of oven dry stock quality, slurry dense 10%, 80~95 DEG C of temperature.
In conclusion by adding auxiliary agent in poplar slab prehydrolysis come the hemicellulose in selectively removing poplar slab, Then using the Soda/AQ stage cooking of addition auxiliary agent, as far as possible removing lignin, cellulose is protected, slurry carries out after boiling OPDQEPP bleaching further removes lignin and adjusts the degree of polymerization of dissolving pulp, finally, with enzyme collaboration technique to the purity of dissolving pulp The reactivity for further increasing and adjusting dissolving pulp obtains the poplar slab vinegar-grade dissolution of high-purity and high reaction activity Slurry.
Beneficial effects of the present invention:
(1) hemicellulose in poplar slab is significantly selectively dissolved out by means of the prehydrolysis of addition auxiliary agent first, is finally adopted Take enzyme collaboration processing to further increase the purity of poplar slab slurry and acetify response value, in conjunction with Soda/AQ stage cooking and OPDQEPP bleaching, is prepared for the poplar slab vinegar-grade dissolving pulp of high-purity and high reaction activity；
(2) process poplar slab of the present invention, chemicals clean and environmental protection used, production technology cleaning are used.
Detailed description of the invention
Fig. 1 is the process flow chart that poplar slab produces vinegar-grade dissolving pulp.
Specific embodiment
In order to better understand the present invention, it is further illustrated below with reference to specific example.
It is Boratex, magnesium sulfate, thermally coupled distillation columns and imino group that auxiliary agent is hydrolyzed in following embodiment The mixture that four sodium of disuccinic acid is mixed to get according to mass ratio 1:1:1:1.
The percentage composition of material used is its percentage composition for accounting for oven dry stock quality in each operation stage.
Embodiment 1:
Add prehydrolysis-addition auxiliary agent Soda/AQ stage cooking-O of auxiliary agentPQDEpP- enzyme cooperates with process poplar slab Raw material: taking the poplar slab piece of 500g factory, long 10-30mm, hemi-cellulose content 24.3%, and alpha-cellulose content is 43.0%。
The pre-hydrolysis technique condition of control addition auxiliary agent are as follows: liquor ratio 1:6, auxiliary agent 0.4%, 160 DEG C of maximum temperature, when heat preservation Between 60 minutes, after hydrolysis hemi-cellulose content be 8.6%, hydrolyze yield 80%；
I segment process condition of Soda/AQ boiling are as follows: alkali charge 5%, liquor ratio 1:4, magnesium hydroxide 0.5%, sodium sulfite are 5.0%, AQ dosage be 0.05%, Tmax=100 DEG C ± 2 DEG C, soaking time 60 minutes；
II segment process condition of Soda/AQ boiling are as follows: alkali charge 18%, magnesium hydroxide 0.5%, sodium sulfite are 3.0 %, liquor ratio 1:7, AQ dosage be 0.05%, 160 DEG C of maximum temperature, soaking time 120 minutes；
OPThe oxygen pressure of drift is 0.5Mpa, starches dense 10%, MgSO40.6%, NaOH 2.0%, H2O21.0%, 95 DEG C of temperature, heat preservation 60min；
QDDense 4.0%, pH=1.5, sodium chlorite dosage 3.0%, IDS are starched in the 60 minutes reaction time of bleaching process, T=30 ± 2 DEG C Dosage 0.05%；
The reaction time 90min., MgSO of Ep extraction process40.5%, NaOH 3.0%, H2O22.0%, IDS dosage 0.05%, slurry Dense 8%, 85 DEG C of temperature；
The reaction time 120min., MgSO of P drift40.5%, NaOH 0.4%, NaAC 0.4%, H2O23.0%, slurry dense 10%, temperature 90 DEG C of degree；
Enzyme cooperates with treatment conditions are as follows: slurry dense 5%, handles time 60min, pH=5.0, poly-aspartate by 40 DEG C of temperature (polyaspartic acid) dosage 0.05%, OP-13 dosage 0.005%, OP-15 dosage 0.005%, cellulose restriction endonuclease Dosage is 0.2IU/gpulp, and zytase dosage is 3XU/gpulp, and pectin enzyme dosage is 3 IU/gpulp.
The alpha-cellulose content for obtaining poplar slab vinegar-grade dissolving pulp is 97%, poly-pentose 2.6%, the degree of polymerization 1250, Whiteness 89%ISO, content of ashes 0.01%, DCM the extractives content 0.03% acetify response value (PV value) 800.
Every Testing index of poplar slab vinegar-grade dissolving pulp is preferable, can be used to produce high-grade cellulose acetate production Product.
Embodiment 2:
Add prehydrolysis-addition auxiliary agent Soda/AQ stage cooking-O of auxiliary agentPQDEpP- enzyme cooperates with process poplar slab Raw material, the hemi-cellulose content of taken poplar slab are 22.3%, alpha-cellulose content 45.0%, process conditions with embodiment 1 It is identical.The alpha-cellulose content for obtaining poplar slab vinegar-grade dissolving pulp is 97%, poly-pentose 2.2%, and the degree of polymerization 1280 is white 90%ISO, content of ashes 0.01% are spent, DCM the extractives content 0.02% acetifies response value (PV value) 820.
Every Testing index of poplar slab vinegar-grade dissolving pulp is preferable, can be used to produce high-grade cellulose acetate production Product.
Embodiment 3:
Add prehydrolysis-addition auxiliary agent Soda/AQ stage cooking-O of auxiliary agentPQDEpP- enzyme cooperates with process poplar slab Raw material, taken poplar slab is the same as embodiment 1.Only changing prehydrolysis soaking time is 120 minutes, and hemi-cellulose content is after hydrolysis 8.5%, yield 79% is hydrolyzed, other techniques are constant.The alpha-cellulose content for finally obtaining poplar slab vinegar-grade dissolving pulp is 97%, poly-pentose 2.2%, the degree of polymerization 1200, whiteness 89%ISO, content of ashes 0.01%, DCM the extractives content 0.02% acetifies Response value (PV value) 780.
Embodiment 4:
Add prehydrolysis-addition auxiliary agent Soda/AQ stage cooking-O of auxiliary agentPQDEpP- enzyme cooperates with process poplar slab Raw material, taken poplar slab is the same as embodiment 1.Only changing II section of cooking liquor ratio of Soda/AQ boiling is 1:4, other techniques are constant.Most The alpha-cellulose content for obtaining poplar slab vinegar-grade dissolving pulp eventually is 97%, poly-pentose 2.5%, the degree of polymerization 1060, whiteness 90%ISO, content of ashes 0.01%, DCM the extractives content 0.02% acetify response value (PV value) 730.
Every Testing index of poplar slab vinegar-grade dissolving pulp is preferable, can be used to produce high-grade cellulose acetate production Product.
Embodiment 5:
Add the Soda/AQ stage cooking-O of auxiliary agentPQDEpP- enzyme cooperates with process poplar slab raw material, taken poplar slab With embodiment 1.Step addition auxiliary agent prehydrolysis is removed, liquor ratio 1:6, other techniques are identical with embodiment 1.Finally obtain poplar The alpha-cellulose content of plank skin vinegar-grade dissolving pulp is 95%, poly-pentose 3.6%, the degree of polymerization 1200, whiteness 88%ISO, ash Divide content 0.015%, DCM the extractives content 0.025% acetifies response value (PV value) 680.
Embodiment 6:
Add prehydrolysis-addition auxiliary agent Soda/AQ stage cooking-O of auxiliary agentPQDEpP- enzyme cooperates with process poplar slab Raw material, taken poplar slab is the same as embodiment 1.One section of boiling is merged into two sections of boilings of step (2) and (3), two sections of boilings are used Alkali, magnesium hydroxide, sodium sulfite, AQ are added at one time, liquor ratio 1:6, Tmax=100 DEG C ± 2 DEG C, and soaking time 60 minutes；Then 160 DEG C keep the temperature 120 minutes, other techniques are identical with embodiment 1.Finally obtain the alpha-cellulose of poplar slab vinegar-grade dissolving pulp Content is 96%, poly-pentose 2.7%, the degree of polymerization 1000, whiteness 89%ISO, content of ashes 0.01%, DCM the extractives content 0.02%, acetify response value (PV value) 700.
The above embodiment is a preferred embodiment of the present invention, but embodiments of the present invention are not by the limit of embodiment System, other any changes made without departing from the spirit and principles of the present invention, modification, combination, substitution, simplification should be Equivalence replacement mode, is included within the scope of the present invention.

Claims (9)

1. a kind of method using poplar slab production vinegar-grade dissolving pulp, it is characterised in that the following steps are included:
(1) add auxiliary agent prehydrolysis: liquor ratio 1:(4~10), hydrolysis additive dosage be poplar slab dry biomass 0.1~ 2.0%, 80~170 DEG C of hydrolysis temperature, soaking time 10~180 minutes, hydrolysis auxiliary agent was Boratex, magnesium sulfate, polyoxyethylene nonyl phenyl The mixture that ethylene ether phosphate and four sodium of iminodisuccinic acid are mixed to get according to mass ratio 1:1:1:1；
(2) I section of Soda/AQ boiling；
(3) II section of Soda/AQ boiling；
(4) OPDQEPP bleaching；
(5) enzyme collaboration is handled: slurry dense 2~10%, 30-50 DEG C of temperature, handles time 60min, pH=4.0~7.0, poly- asparagus fern ammonia Sour dosage is the 0.01%-1.0% of oven dry stock quality, and OP-13 dosage is the 0.001-0.01% of oven dry stock quality, OP-15 dosage For the 0.001-0.01% of oven dry stock quality, cellulose inscribe enzyme dosage is 0.1~0.6IU/gpulp, and zytase dosage is 2 ~4XU/gpulp, pectin enzyme dosage are 0.1~10 IU/gpulp.
2. according to the method described in claim 1, it is characterized in that I segment process condition of Soda/AQ boiling are as follows: with Na2O meter uses alkali Amount is the 5~15% of oven dry stock quality, liquor ratio 1:(3~8), magnesium hydroxide dosage is the 0.5% of oven dry stock quality, sodium sulfite Dosage is that 1.0~10.0%, the AQ dosage of oven dry stock quality is the 0.05% of oven dry stock quality, 80~120 DEG C of temperature, soaking time 10~180 minutes.
3. according to the method described in claim 1, it is characterized in that II segment process condition of Soda/AQ boiling are as follows: with Na2O meter uses alkali Amount is the 5~25% of oven dry stock quality, and magnesium hydroxide dosage is the 0.5% of oven dry stock quality, and sodium sulfite dosage is oven dry stock matter The 1.0~10.0% of amount, liquor ratio 1:(3~10), AQ dosage is the 0.05% of oven dry stock quality, 140~180 DEG C of temperature, when heat preservation Between 10~240 minutes.
4. according to the method described in claim 1, it is characterized in that OPDQEPP bleaching conditions are as follows: OPThe oxygen pressure of drift is 0.4 ~0.6Mpa starches dense 10%, MgSO4Dosage is that 0.6%, the NaOH dosage of oven dry stock quality is the 1.0~3.0% of oven dry stock quality, H2O2Dosage is the 0.5~3.0% of oven dry stock quality, 70~110 DEG C of temperature, keeps the temperature 60min..
5. according to the method described in claim 1, it is characterized in that OPDQEPP bleaching conditions are as follows: QDThe reaction of bleaching process Time 10~120 minutes, dense 2~8%, pH=1~3 were starched in T=30 ± 2 DEG C, and sodium chlorite dosage is the 0.2- of oven dry stock quality 6.0%, IDS dosage are the 0.01~1.0% of oven dry stock quality.
6. according to the method described in claim 1, it is characterized in that OPDQEPP bleaching conditions are as follows: the reaction of Ep extraction process 30~180min. of time, MgSO4Dosage is that 0.5%, the NaOH dosage of oven dry stock quality is the 0.5-5.0% of oven dry stock quality , H2O2Dosage is the 1.0-5.0% of oven dry stock quality, and IDS dosage is the 0.01~1.0% of oven dry stock quality, slurry dense 8%, temperature 70 ~95 DEG C.
7. according to the method described in claim 1, it is characterized in that OPDQEPP bleaching conditions are as follows: the reaction time 60 of P drift ~180min., MgSO4Dosage is that 0.5%, the NaOH dosage of oven dry stock quality is 0.4%, the NaAC dosage of oven dry stock quality For 0.4%, H of oven dry stock quality2O21.0-5.0% of the dosage for oven dry stock quality, slurry dense 10%, 80~95 DEG C of temperature.
8. according to the method described in claim 1, characterized by the following steps:
(1) add auxiliary agent prehydrolysis: liquor ratio 1:6, auxiliary dosage be oven dry stock quality 0.4%, 160 DEG C of temperature, soaking time 60 minutes；
(2) I section of Soda/AQ boiling: alkali charge is the 5% of oven dry stock quality, and liquor ratio 1:4, magnesium hydroxide dosage is oven dry stock matter The 0.5% of amount, sodium sulfite dosage is that 5.0%, the AQ dosage of oven dry stock quality is 0.05%, Tmax=100 of oven dry stock quality DEG C ± 2 DEG C, soaking time 60 minutes；
(3) II section of Soda/AQ boiling: alkali charge is the 18% of oven dry stock quality, and magnesium hydroxide dosage is oven dry stock quality 0.5%, sodium sulfite dosage is 3.0 % of oven dry stock quality, and liquor ratio 1:7, AQ dosage is the 0.05% of oven dry stock quality, highest 160 DEG C of temperature, soaking time 120 minutes；
(4) OPDQEPP bleaches OPThe oxygen pressure of drift is 0.5Mpa, starches dense 10%, MgSO4Dosage is that 0.6%, NaOH of oven dry stock quality is used Amount is 2.0%, H of oven dry stock quality2O2Dosage is the 1.0% of oven dry stock quality, 95 DEG C of temperature, keeps the temperature 60min；QDBleaching process Reaction time 60 minutes, dense 4.0%, pH=1.5 are starched in T=30 ± 2 DEG C, and sodium chlorite dosage is 3.0%, IDS of oven dry stock quality Dosage is the 0.05% of oven dry stock quality；The reaction time 90min., MgSO of Ep extraction process4Dosage is oven dry stock quality 0.5%, NaOH dosage are 3.0%, H of oven dry stock quality2O2Dosage is that 2.0%, the IDS dosage of oven dry stock quality is oven dry stock matter The 0.05% of amount, slurry dense 8%, 85 DEG C of temperature；The reaction time 120min., MgSO of P drift4Dosage is the 0.5% of oven dry stock quality, NaOH dosage is that 0.4%, the NaAC dosage of oven dry stock quality is 0.4%, H of oven dry stock quality2O2Dosage is oven dry stock quality 3.0%, slurry dense 10%, 90 DEG C of temperature；
(5) enzyme collaboration is handled: slurry dense 5%, 40 DEG C of temperature, handles time 60min, pH=5.0, poly-aspartate dosage is over dry 0.05%, the OP-13 dosage of slurry quality is that 0.005%, the OP-15 dosage of oven dry stock quality is the 0.005% of oven dry stock quality, fine Tieing up plain inscribe enzyme dosage is 0.2IU/gpulp, and zytase dosage is 3XU/gpulp, and pectin enzyme dosage is 3 IU/gpulp.
9. according to the method described in claim 1, it is characterized in that the long 10-30mm of poplar slab used in step (1), poly- penta Sugared content is 22.3-24.3%, alpha-cellulose content 43.0-45.0%.
CN201811228170.XA 2018-10-22 2018-10-22 Method for producing acetified-grade dissolving pulp by using poplar slabs Expired - Fee Related CN109403115B (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
CN201811228170.XA CN109403115B (en) 2018-10-22 2018-10-22 Method for producing acetified-grade dissolving pulp by using poplar slabs
PCT/CN2018/114525 WO2020082427A1 (en) 2018-10-22 2018-11-08 Method for using poplar bark to produce acetylation-grade dissolving pulp
US16/314,319 US20200173103A1 (en) 2018-10-22 2018-11-08 Method for producing acetate grade dissolving pulp from poplar residual slabs
BE20195709A BE1026675B1 (en) 2018-10-22 2019-10-17 PROCESS FOR THE PRODUCTION OF ACETATE QUALITY DISSOLVING PASTE FROM RESIDUAL POPLAR SLABS

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