CN109162135A - A method of dissolving pulp and xylo-oligosaccharide are produced using broad-leaved wood - Google Patents
A method of dissolving pulp and xylo-oligosaccharide are produced using broad-leaved wood Download PDFInfo
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- CN109162135A CN109162135A CN201811069362.0A CN201811069362A CN109162135A CN 109162135 A CN109162135 A CN 109162135A CN 201811069362 A CN201811069362 A CN 201811069362A CN 109162135 A CN109162135 A CN 109162135A
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- leaved wood
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- oligosaccharide
- dissolving pulp
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- 239000002023 wood Substances 0.000 title claims abstract description 63
- 229920000875 Dissolving pulp Polymers 0.000 title claims abstract description 35
- HEBKCHPVOIAQTA-NGQZWQHPSA-N d-xylitol Chemical compound OC[C@H](O)C(O)[C@H](O)CO HEBKCHPVOIAQTA-NGQZWQHPSA-N 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000004519 manufacturing process Methods 0.000 claims abstract description 24
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 claims abstract description 22
- 230000007062 hydrolysis Effects 0.000 claims abstract description 22
- 238000006460 hydrolysis reaction Methods 0.000 claims abstract description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 16
- 238000001704 evaporation Methods 0.000 claims abstract description 15
- 230000008020 evaporation Effects 0.000 claims abstract description 15
- 238000005349 anion exchange Methods 0.000 claims abstract description 14
- 239000007788 liquid Substances 0.000 claims abstract description 14
- 239000007787 solid Substances 0.000 claims abstract description 13
- 238000009835 boiling Methods 0.000 claims abstract description 12
- 230000000694 effects Effects 0.000 claims abstract description 12
- 238000004042 decolorization Methods 0.000 claims abstract description 8
- 230000007071 enzymatic hydrolysis Effects 0.000 claims abstract description 8
- 238000006047 enzymatic hydrolysis reaction Methods 0.000 claims abstract description 8
- 238000007738 vacuum evaporation Methods 0.000 claims abstract description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 15
- 230000005540 biological transmission Effects 0.000 claims description 14
- 229910052799 carbon Inorganic materials 0.000 claims description 12
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 10
- 108010001817 Endo-1,4-beta Xylanases Proteins 0.000 claims description 10
- 108090000790 Enzymes Proteins 0.000 claims description 10
- 102000004190 Enzymes Human genes 0.000 claims description 10
- 239000003513 alkali Substances 0.000 claims description 10
- 238000000605 extraction Methods 0.000 claims description 10
- 101710121765 Endo-1,4-beta-xylanase Proteins 0.000 claims description 6
- LGQKSQQRKHFMLI-UHFFFAOYSA-N 4-O-beta-D-xylopyranosyl-beta-D-xylopyranose Natural products OC1C(O)C(O)COC1OC1C(O)C(O)C(O)OC1 LGQKSQQRKHFMLI-UHFFFAOYSA-N 0.000 claims description 5
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 5
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 5
- 238000010411 cooking Methods 0.000 claims description 5
- 230000029087 digestion Effects 0.000 claims description 5
- 229930182470 glycoside Natural products 0.000 claims description 5
- 150000002338 glycosides Chemical class 0.000 claims description 5
- 241000228245 Aspergillus niger Species 0.000 claims description 3
- 238000010025 steaming Methods 0.000 claims 1
- 239000002994 raw material Substances 0.000 abstract description 13
- 239000002351 wastewater Substances 0.000 abstract description 5
- 238000002425 crystallisation Methods 0.000 abstract 1
- 230000008025 crystallization Effects 0.000 abstract 1
- 229920001221 xylan Polymers 0.000 description 9
- 150000004823 xylans Chemical class 0.000 description 9
- 229920002488 Hemicellulose Polymers 0.000 description 7
- SRBFZHDQGSBBOR-IOVATXLUSA-N D-xylopyranose Chemical compound O[C@@H]1COC(O)[C@H](O)[C@H]1O SRBFZHDQGSBBOR-IOVATXLUSA-N 0.000 description 6
- 239000002699 waste material Substances 0.000 description 5
- 229920002678 cellulose Polymers 0.000 description 4
- 239000001913 cellulose Substances 0.000 description 4
- 244000166124 Eucalyptus globulus Species 0.000 description 3
- PYMYPHUHKUWMLA-UHFFFAOYSA-N arabinose Natural products OCC(O)C(O)C(O)C=O PYMYPHUHKUWMLA-UHFFFAOYSA-N 0.000 description 3
- 239000002585 base Substances 0.000 description 3
- SRBFZHDQGSBBOR-UHFFFAOYSA-N beta-D-Pyranose-Lyxose Natural products OC1COC(O)C(O)C1O SRBFZHDQGSBBOR-UHFFFAOYSA-N 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000006731 degradation reaction Methods 0.000 description 3
- 230000002255 enzymatic effect Effects 0.000 description 3
- 239000000835 fiber Substances 0.000 description 3
- 238000004065 wastewater treatment Methods 0.000 description 3
- 239000002253 acid Substances 0.000 description 2
- 108010089934 carbohydrase Proteins 0.000 description 2
- 238000005342 ion exchange Methods 0.000 description 2
- 241000228212 Aspergillus Species 0.000 description 1
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 1
- 235000017491 Bambusa tulda Nutrition 0.000 description 1
- 229920000742 Cotton Polymers 0.000 description 1
- 244000082204 Phyllostachys viridis Species 0.000 description 1
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 1
- 229920001131 Pulp (paper) Polymers 0.000 description 1
- 229920000297 Rayon Polymers 0.000 description 1
- 239000011425 bamboo Substances 0.000 description 1
- 150000001720 carbohydrates Chemical class 0.000 description 1
- 235000014633 carbohydrates Nutrition 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000009738 saturating Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- 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
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12P—FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
- C12P19/00—Preparation of compounds containing saccharide radicals
- C12P19/14—Preparation of compounds containing saccharide radicals produced by the action of a carbohydrase (EC 3.2.x), e.g. by alpha-amylase, e.g. by cellulase, hemicellulase
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Organic Chemistry (AREA)
- Wood Science & Technology (AREA)
- Engineering & Computer Science (AREA)
- Biochemistry (AREA)
- Zoology (AREA)
- Microbiology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Biotechnology (AREA)
- Bioinformatics & Cheminformatics (AREA)
- General Engineering & Computer Science (AREA)
- General Health & Medical Sciences (AREA)
- Genetics & Genomics (AREA)
- Preparation Of Compounds By Using Micro-Organisms (AREA)
Abstract
The invention discloses a kind of methods using broad-leaved wood production dissolving pulp and xylo-oligosaccharide, and the mixed liquor of broad-leaved wood and water is squeezed into continuous hydrolysis tower, is continually fed into sulfur dioxide in continuous hydrolysis tower；Broad-leaved wood is hydrolyzed the extracting of liquid；(3) hydrolyzate is successively obtained into xylo-oligosaccharide by decoloration, sun-anion exchange, vacuum evaporation, enzymatic hydrolysis, secondary decolourization, secondary sun-anion exchange, multiple-effect evaporation, single effect evaporation, crystallization；(4) boiling is carried out to the broad-leaved wood solids after extracting hydrolyzate and obtains dissolving pulp；Present invention coproduction xylo-oligosaccharide while using broad-leaved wood production dissolving pulp, improves raw material availability, reduces waste water generation, be suitable for industrialized production.
Description
Technical field
The present invention relates to dissolving pulp preparation technical field, more particularly to it is a kind of using broad-leaved wood production dissolving pulp with it is low
The method of xylan.
Background technique
The raw material of production dissolving pulp is mainly cotton linter, timber and bamboo, and the raw material that short fibre wood pulp uses is leaf wood, fine
Dimension is shorter, and generally 0.8-1.1 millimeters.It can be individually or with drift needle slurry with copying various text papers etc..
In production dissolving pulp, the hemicellulose in raw material must be removed, especially xylan, this is because they by cause compared with
High process chemical consumes and interferes viscose glue production process.
Papermaking enterprise is generally directly handled dissolving pulp prehydrolysis waste liquid feeding waste water treatment system at present, is not only made
At the waste of hemicellulose carbohydrate resources a large amount of in waste liquid, also causes wastewater treatment load to increase and increase with cost for wastewater treatment
It is high.Due to containing a large amount of xylans in leaf wood prehydrolysis waste liquid, the new raw material of xylooligosaccharides production can be used as
Source, with meet people to xylo-oligosaccharide demand increasingly increase and xylooligosaccharides production raw materials requirement amount is growing wants
It asks.But in the prior art during degradation of hemicellulose, it will usually which there are excessive degradations into xylose monomers, and reacted
The problems such as journey can generate a large amount of acid waste waters, and raw material availability is too low.
From industrial application angle, how broad-leaved wood to be utilized to produce dissolving pulp and xylo-oligosaccharide simultaneously, reach abundant
It is the technical problem to be solved in the present invention using the effect of resource.
Summary of the invention
The present invention provides a kind of utilization broad-leaved wood production dissolving pulp and oligomeric wood aiming at above-mentioned defect
The method of sugar.Present invention coproduction xylo-oligosaccharide while using broad-leaved wood production dissolving pulp, improves raw material availability, subtracts
Lack waste water generation, is suitable for industrialized production.
A kind of method and technology scheme for producing dissolving pulp and xylo-oligosaccharide using broad-leaved wood of the invention is, including following
Step:
(1) mixed liquor of broad-leaved wood and water is squeezed into continuous hydrolysis tower, is continually fed into sulfur dioxide in continuous hydrolysis tower；
(2) extracting of liquid broad-leaved wood is hydrolyzed；
(3) by hydrolyzate successively by decoloration, sun-anion exchange, vacuum evaporation, enzymatic hydrolysis, secondary decolourization, secondary sun-
Anion exchange, evaporation obtain xylo-oligosaccharide；
(4) boiling is carried out to the broad-leaved wood solids after extracting hydrolyzate and obtains dissolving pulp；
In step (1), the weight ratio 1:2-10 of broad-leaved wood and water, sulfur dioxide intake is the 0.1%- of broad-leaved wood weight
3%。
In step (1), pH is 0.5-3.5 in continuous hydrolysis tower.
In step (2), extraction temperature in continuous hydrolysis tower is at 130 DEG C -200 DEG C, extraction times 30min-180min.
In step (3), the enzymatic hydrolysis is using inscribe beta-xylanase, circumscribed beta-xylanase, β-xylobiose glycosides enzyme and black
At least one of Xylanase from Aspergillus, it wait digest Xylanase activity in liquid is 200 that zytase enzyme dosage, which is every milliliter,
~500IU.
Step (3) is specifically, it is 2.8-3.2 that hydrolyzate, which is neutralized to pH with calcium carbonate, and then plus active carbon decoloring is to saturating
PH is adjusted to 5.0-6.0, conductivity is adjusted to 1000us/cm hereinafter, passing through vacuum by sun-anion exchange by light 65-70%
Hydrolyzate refractive power is concentrated into 20-23 by evaporation, and temperature adjustment is to 25 DEG C；Zytase is accessed in hydrolyzate, handles 3 at 45~60 DEG C
~6h, then with active carbon secondary decolourization to light transmission 80%, then with sun-anion exchange to conductivity 50us hereinafter, pH is 4.5-
5.5,90% or more light transmission, then multiple-effect evaporation to refractive power 55 continues single effect evaporation to refractive power 82, and then massecuite enters crystallizing tank,
Decrease temperature crystalline, massecuite gets rid of sugar to get xylo-oligosaccharide out.
Massecuite gets rid of sugar when being cooled to 32 DEG C.
In step (4), boiling, conditions of cooking are carried out to the broad-leaved wood solids after extracting hydrolyzate using sulfate process
It is as follows: to be 25-35%, steam by the sulphidity of effective alkali, effective alkali that broad-leaved wood oven-dry weight is the 18-22% in terms of NaOH
Boil temperature be 140-170 DEG C, broad-leaved wood solids and water quality ratio 1:3-1:5, digestion time 2-3h.
The invention has the benefit that present invention coproduction xylo-oligosaccharide while using broad-leaved wood production dissolving pulp,
Raw material availability is improved, reduces waste water generation, is suitable for industrialized production.
Adjustment of the present invention for process conditions can be improved cellulose and hemicellulose utilization rate in raw material, control
Enzymolysis process, avoids the excessive degradation of xylose, reduces the pollution of waste and acid waste water, and dissolving pulp with it is oligomeric
Xylose production can carry out simultaneously, improve production efficiency.
Specific embodiment:
For a better understanding of the present invention, below with specific example come the technical solution that the present invention will be described in detail, but it is of the invention
It is not limited thereto.
Embodiment 1
A method of dissolving pulp and xylo-oligosaccharide are produced using broad-leaved wood, comprising the following steps:
(1) mixed liquor of broad-leaved wood and water is squeezed into continuous hydrolysis tower, is continually fed into sulfur dioxide in continuous hydrolysis tower；It is wealthy
The weight ratio 1:6 of leaf timber and water, sulfur dioxide intake are the 1.5% of broad-leaved wood weight, and pH is 0.5- in continuous hydrolysis tower
3.5。
(2) extracting of liquid broad-leaved wood is hydrolyzed；Extraction temperature is at 160 DEG C, extraction times 100min.
(3) hydrolyzate is neutralized to pH with calcium carbonate is 2.8-3.2, and then plus active carbon decoloring is to light transmission 68%, is passed through
PH is adjusted to 5.5 by sun-anion exchange, and conductivity is adjusted to 1000us/cm hereinafter, by being evaporated in vacuo hydrolyzate refractive power
22 are concentrated into, temperature adjustment is to 25 DEG C；Zytase is accessed in hydrolyzate, 4h is handled at 50 DEG C, then uses active carbon secondary decolourization
To light transmission 80%, then with sun-anion exchange to conductivity 50us hereinafter, pH is 5,90% or more light transmission, then multiple-effect evaporation is extremely
Refractive power 55 continues single effect evaporation to refractive power 82, and then massecuite enters crystallizing tank, and decrease temperature crystalline, massecuite is got rid of out when being cooled to 32 DEG C
Sugar uses inscribe beta-xylanase, circumscribed beta-xylanase, β-xylobiose glycosides enzyme and black song to get xylo-oligosaccharide, the enzymatic hydrolysis
At least one of mould zytase, it wait digest Xylanase activity in liquid is 300IU that zytase enzyme dosage, which is every milliliter,.
It is 80.3% that xylan hydrolysis, which is converted to the conversion ratio of xylo-oligosaccharide, after enzymatic treatment, in hydrolyzate.This yield is phase
For the ratio of xylan contained in raw material.
(4) boiling is carried out to the broad-leaved wood solids after extracting hydrolyzate using sulfate process, conditions of cooking is as follows: base
In broad-leaved wood oven-dry weight is in terms of NaOH 20% effective alkali, the sulphidity of effective alkali is 30%, boiling temperature 160
DEG C, broad-leaved wood solids and water quality ratio 1:4, digestion time be that 2.5h obtains dissolving pulp.
Dissolving pulp yield is 39% based on original Eucalyptus piece, viscosity 500ml/g, hemi-cellulose content 3.50%, α-fibre
Tie up cellulose content 95.0%, Kappa number 0.75.
Embodiment 2
A method of dissolving pulp and xylo-oligosaccharide are produced using broad-leaved wood, comprising the following steps:
(1) mixed liquor of broad-leaved wood and water is squeezed into continuous hydrolysis tower, is continually fed into sulfur dioxide in continuous hydrolysis tower；It is wealthy
The weight ratio 1:10 of leaf timber and water, sulfur dioxide intake are the 3% of broad-leaved wood weight, and pH is 0.5- in continuous hydrolysis tower
3.5。
(2) extracting of liquid broad-leaved wood is hydrolyzed；Extraction temperature is at 200 DEG C, extraction times 180min.
(3) hydrolyzate is neutralized to pH with calcium carbonate is 3.0, and then plus active carbon decoloring is to light transmission 70%, passes through sun-yin
PH is adjusted to 6.0 by ion exchange, and conductivity is adjusted to 1000us/cm hereinafter, being concentrated into hydrolyzate refractive power by being evaporated in vacuo
23, temperature adjustment is to 25 DEG C；Zytase is accessed in hydrolyzate, 3h is handled at 60 DEG C, then with active carbon secondary decolourization to light transmission
80%, then with sun-anion exchange to conductivity 50us hereinafter, pH is 5.5,90% or more light transmission, then multiple-effect evaporation to refractive power
55, continue single effect evaporation to refractive power 82, then massecuite enters crystallizing tank, and decrease temperature crystalline, massecuite gets rid of sugar out when being cooled to 32 DEG C, i.e.,
Xylo-oligosaccharide is obtained, the enzymatic hydrolysis is poly- using inscribe beta-xylanase, circumscribed beta-xylanase, β-xylobiose glycosides enzyme and aspergillus niger wood
At least one of carbohydrase, it wait digest Xylanase activity in liquid is 500IU that zytase enzyme dosage, which is every milliliter,.
It is 78.6% that xylan hydrolysis, which is converted to the conversion ratio of xylo-oligosaccharide, after enzymatic treatment, in hydrolyzate.This yield is phase
For the ratio of xylan contained in raw material.
(4) boiling is carried out to the broad-leaved wood solids after extracting hydrolyzate using sulfate process, conditions of cooking is as follows: base
In broad-leaved wood oven-dry weight is in terms of NaOH 22% effective alkali, the sulphidity of effective alkali is 35%, boiling temperature 170
DEG C, broad-leaved wood solids and water quality ratio 1:5, digestion time be that 3h obtains dissolving pulp.
Dissolving pulp yield is 38% based on original Eucalyptus piece, viscosity 480ml/g, hemi-cellulose content 3.40%, α-fibre
Tie up cellulose content 94.6%, Kappa number 0.78.
Embodiment 3
A method of dissolving pulp and xylo-oligosaccharide are produced using broad-leaved wood, comprising the following steps:
(1) mixed liquor of broad-leaved wood and water is squeezed into continuous hydrolysis tower, is continually fed into sulfur dioxide in continuous hydrolysis tower；It is wealthy
The weight ratio 1:3 of leaf timber and water, sulfur dioxide intake are the 0.7% of broad-leaved wood weight, and pH is 0.5- in continuous hydrolysis tower
3.5。
(2) extracting of liquid broad-leaved wood is hydrolyzed；Extraction temperature is at 150 DEG C, extraction times 60min.
(3) hydrolyzate is neutralized to pH with calcium carbonate is 2.8, and then plus active carbon decoloring is to light transmission 65%, passes through sun-yin
PH is adjusted to 5.0 by ion exchange, and conductivity is adjusted to 1000us/cm hereinafter, being concentrated into hydrolyzate refractive power by being evaporated in vacuo
20, temperature adjustment is to 25 DEG C；Zytase is accessed in hydrolyzate, 6h is handled at 45 DEG C, then with active carbon secondary decolourization to light transmission
80%, then with sun-anion exchange to conductivity 50us hereinafter, pH is 4.5,90% or more light transmission, then multiple-effect evaporation to refractive power
55, continue single effect evaporation to refractive power 82, then massecuite enters crystallizing tank, and decrease temperature crystalline, massecuite gets rid of sugar out when being cooled to 32 DEG C, i.e.,
Xylo-oligosaccharide is obtained, the enzymatic hydrolysis is poly- using inscribe beta-xylanase, circumscribed beta-xylanase, β-xylobiose glycosides enzyme and aspergillus niger wood
At least one of carbohydrase, it wait digest Xylanase activity in liquid is 200IU that zytase enzyme dosage, which is every milliliter,.
It is 77.2% that xylan hydrolysis, which is converted to the conversion ratio of xylo-oligosaccharide, after enzymatic treatment, in hydrolyzate.This yield is phase
For the ratio of xylan contained in raw material.
(4) boiling is carried out to the broad-leaved wood solids after extracting hydrolyzate using sulfate process, conditions of cooking is as follows: base
In broad-leaved wood oven-dry weight is in terms of NaOH 18% effective alkali, the sulphidity of effective alkali is 25%, boiling temperature 140
DEG C, broad-leaved wood solids and water quality ratio 1:3, digestion time be that 2h obtains dissolving pulp.
Dissolving pulp yield is 37.6% based on original Eucalyptus piece, viscosity 440ml/g, hemi-cellulose content 3.30%, α-
Content of cellulose 94.3%, Kappa number 0.76.
Claims (8)
1. a kind of method using broad-leaved wood production dissolving pulp and xylo-oligosaccharide, which comprises the following steps:
(1) mixed liquor of broad-leaved wood and water is squeezed into continuous hydrolysis tower, is continually fed into sulfur dioxide in continuous hydrolysis tower；
(2) extracting of liquid broad-leaved wood is hydrolyzed；
(3) by hydrolyzate successively by decoloration, sun-anion exchange, vacuum evaporation, enzymatic hydrolysis, secondary decolourization, secondary sun-
Anion exchange, evaporation obtain xylo-oligosaccharide；
(4) boiling is carried out to the broad-leaved wood solids after extracting hydrolyzate and obtains dissolving pulp.
2. a kind of method using broad-leaved wood production dissolving pulp and xylo-oligosaccharide according to claim 1, feature
It is, in step (1), the weight ratio 1:2-10 of broad-leaved wood and water, sulfur dioxide intake is the 0.1%- of broad-leaved wood weight
3%。
3. a kind of method using broad-leaved wood production dissolving pulp and xylo-oligosaccharide according to claim 1, feature
It is, in step (1), pH is 0.5-3.5 in continuous hydrolysis tower.
4. a kind of method using broad-leaved wood production dissolving pulp and xylo-oligosaccharide according to claim 1, feature
It is, in step (2), extraction temperature in continuous hydrolysis tower is at 130 DEG C -200 DEG C, extraction times 30min-180min.
5. a kind of method using broad-leaved wood production dissolving pulp and xylo-oligosaccharide according to claim 1, feature
It is, in step (3), the enzymatic hydrolysis uses inscribe beta-xylanase, circumscribed beta-xylanase, β-xylobiose glycosides enzyme and aspergillus niger
At least one of zytase, zytase enzyme dosage be every milliliter wait digest Xylanase activity in liquid be 200~
500IU。
6. a kind of method using broad-leaved wood production dissolving pulp and xylo-oligosaccharide according to claim 1, feature
It is, step (3) is specifically, it is 2.8-3.2 that hydrolyzate, which is neutralized to pH with calcium carbonate, and then plus active carbon decoloring is to light transmission
PH is adjusted to 5.0-6.0, conductivity is adjusted to 1000us/cm hereinafter, steaming by vacuum by sun-anion exchange by 65-70%
Hydrolyzate refractive power is concentrated into 20-23 by hair, and temperature adjustment is to 25 DEG C；Zytase is accessed in hydrolyzate, at 45~60 DEG C handle 3~
6h, then with active carbon secondary decolourization to light transmission 80%, then with sun-anion exchange to conductivity 50us hereinafter, pH is 4.5-
5.5,90% or more light transmission, then multiple-effect evaporation to refractive power 55 continues single effect evaporation to refractive power 82, and then massecuite enters crystallizing tank,
Decrease temperature crystalline, massecuite gets rid of sugar to get xylo-oligosaccharide out.
7. a kind of method using broad-leaved wood production dissolving pulp and xylo-oligosaccharide, feature according to claim 6
It is, massecuite gets rid of sugar when being cooled to 32 DEG C.
8. a kind of method using broad-leaved wood production dissolving pulp and xylo-oligosaccharide according to claim 1, feature
It is, in step (4), boiling is carried out to the broad-leaved wood solids after extracting hydrolyzate using sulfate process, conditions of cooking is such as
Under: by broad-leaved wood oven-dry weight be the effective alkali of the 18-22% in terms of NaOH, effective alkali sulphidity be 25-35%, boiling
Temperature is 140-170 DEG C, broad-leaved wood solids and water quality ratio 1:3-1:5, digestion time 2-3h.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110295510A (en) * | 2019-06-27 | 2019-10-01 | 大连工业大学 | A method of lignin crude product and liquid glucose are prepared using pulping and paper-making waste liquid |
| WO2023143310A1 (en) * | 2022-01-25 | 2023-08-03 | 齐鲁工业大学 | Method for isolating saccharides in pre-hydrolysates of hardwood pulping |
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- 2018-09-13 CN CN201811069362.0A patent/CN109162135A/en active Pending
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| WO2007048879A1 (en) * | 2005-10-28 | 2007-05-03 | Danisco A/S | Separation process |
| CN102257164A (en) * | 2008-10-21 | 2011-11-23 | 丹尼斯克有限公司 | Process of producing xylose and dissolving pulp |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110295510A (en) * | 2019-06-27 | 2019-10-01 | 大连工业大学 | A method of lignin crude product and liquid glucose are prepared using pulping and paper-making waste liquid |
| CN110295510B (en) * | 2019-06-27 | 2021-10-01 | 大连工业大学 | A method for preparing lignin crude product and sugar liquid by utilizing pulp and paper waste liquid |
| WO2023143310A1 (en) * | 2022-01-25 | 2023-08-03 | 齐鲁工业大学 | Method for isolating saccharides in pre-hydrolysates of hardwood pulping |
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