CN114736318A - Method for extracting hemicellulose from chemi-mechanical pulp - Google Patents
Method for extracting hemicellulose from chemi-mechanical pulp Download PDFInfo
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- CN114736318A CN114736318A CN202210188627.9A CN202210188627A CN114736318A CN 114736318 A CN114736318 A CN 114736318A CN 202210188627 A CN202210188627 A CN 202210188627A CN 114736318 A CN114736318 A CN 114736318A
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- 229920002488 Hemicellulose Polymers 0.000 title claims abstract description 67
- 229920001131 Pulp (paper) Polymers 0.000 title claims abstract description 51
- 238000000034 method Methods 0.000 title claims abstract description 35
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 42
- 239000012528 membrane Substances 0.000 claims abstract description 39
- 239000007788 liquid Substances 0.000 claims abstract description 22
- 238000001728 nano-filtration Methods 0.000 claims abstract description 21
- 239000000919 ceramic Substances 0.000 claims abstract description 15
- 238000000926 separation method Methods 0.000 claims abstract description 10
- 239000000463 material Substances 0.000 claims description 33
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 238000001035 drying Methods 0.000 claims description 10
- 239000002253 acid Substances 0.000 claims description 8
- 239000000843 powder Substances 0.000 claims description 8
- 239000000126 substance Substances 0.000 claims description 8
- 239000002023 wood Substances 0.000 claims description 8
- 238000000502 dialysis Methods 0.000 claims description 7
- 239000000706 filtrate Substances 0.000 claims description 6
- 238000001694 spray drying Methods 0.000 claims description 6
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 5
- 239000004744 fabric Substances 0.000 claims description 4
- 239000007921 spray Substances 0.000 claims description 4
- 244000166124 Eucalyptus globulus Species 0.000 claims description 3
- 241000219000 Populus Species 0.000 claims description 3
- 238000003916 acid precipitation Methods 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 2
- 238000001914 filtration Methods 0.000 claims description 2
- 238000000227 grinding Methods 0.000 claims description 2
- 238000004064 recycling Methods 0.000 claims description 2
- 238000005119 centrifugation Methods 0.000 claims 1
- 238000000605 extraction Methods 0.000 abstract description 7
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 abstract 1
- 238000002386 leaching Methods 0.000 abstract 1
- 238000005374 membrane filtration Methods 0.000 abstract 1
- 239000000243 solution Substances 0.000 description 22
- 239000002994 raw material Substances 0.000 description 9
- 238000004537 pulping Methods 0.000 description 8
- 238000007654 immersion Methods 0.000 description 6
- 239000002699 waste material Substances 0.000 description 6
- 238000002791 soaking Methods 0.000 description 4
- 229920002678 cellulose Polymers 0.000 description 3
- 239000001913 cellulose Substances 0.000 description 3
- 239000000835 fiber Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 235000000346 sugar Nutrition 0.000 description 3
- SRBFZHDQGSBBOR-IOVATXLUSA-N D-xylopyranose Chemical compound O[C@@H]1COC(O)[C@H](O)[C@H]1O SRBFZHDQGSBBOR-IOVATXLUSA-N 0.000 description 2
- PYMYPHUHKUWMLA-UHFFFAOYSA-N arabinose Natural products OCC(O)C(O)C(O)C=O PYMYPHUHKUWMLA-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- SRBFZHDQGSBBOR-UHFFFAOYSA-N beta-D-Pyranose-Lyxose Natural products OC1COC(O)C(O)C1O SRBFZHDQGSBBOR-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000020477 pH reduction Effects 0.000 description 2
- KMUONIBRACKNSN-UHFFFAOYSA-N potassium dichromate Chemical compound [K+].[K+].[O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O KMUONIBRACKNSN-UHFFFAOYSA-N 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 244000302661 Phyllostachys pubescens Species 0.000 description 1
- 235000003570 Phyllostachys pubescens Nutrition 0.000 description 1
- 240000008042 Zea mays Species 0.000 description 1
- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 description 1
- 235000002017 Zea mays subsp mays Nutrition 0.000 description 1
- WQZGKKKJIJFFOK-PHYPRBDBSA-N alpha-D-galactose Chemical compound OC[C@H]1O[C@H](O)[C@H](O)[C@@H](O)[C@H]1O WQZGKKKJIJFFOK-PHYPRBDBSA-N 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 229940010514 ammonium ferrous sulfate Drugs 0.000 description 1
- PYMYPHUHKUWMLA-WDCZJNDASA-N arabinose Chemical compound OC[C@@H](O)[C@@H](O)[C@H](O)C=O PYMYPHUHKUWMLA-WDCZJNDASA-N 0.000 description 1
- 210000004027 cell Anatomy 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000010411 cooking Methods 0.000 description 1
- 235000005822 corn Nutrition 0.000 description 1
- 229960001484 edetic acid Drugs 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000032050 esterification Effects 0.000 description 1
- 238000005886 esterification reaction Methods 0.000 description 1
- 238000006266 etherification reaction Methods 0.000 description 1
- IMBKASBLAKCLEM-UHFFFAOYSA-L ferrous ammonium sulfate (anhydrous) Chemical compound [NH4+].[NH4+].[Fe+2].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O IMBKASBLAKCLEM-UHFFFAOYSA-L 0.000 description 1
- 229930182830 galactose Natural products 0.000 description 1
- 239000011121 hardwood Substances 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 238000010297 mechanical methods and process Methods 0.000 description 1
- 210000001724 microfibril Anatomy 0.000 description 1
- 150000002772 monosaccharides Chemical class 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000012086 standard solution Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 239000010902 straw Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 150000008163 sugars Chemical class 0.000 description 1
- 210000001519 tissue Anatomy 0.000 description 1
- 238000004448 titration Methods 0.000 description 1
- 229920001221 xylan Polymers 0.000 description 1
- 150000004823 xylans Chemical class 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
- C08B37/00—Preparation of polysaccharides not provided for in groups C08B1/00 - C08B35/00; Derivatives thereof
- C08B37/0006—Homoglycans, i.e. polysaccharides having a main chain consisting of one single sugar, e.g. colominic acid
- C08B37/0057—Homoglycans, i.e. polysaccharides having a main chain consisting of one single sugar, e.g. colominic acid beta-D-Xylans, i.e. xylosaccharide, e.g. arabinoxylan, arabinofuronan, pentosans; (beta-1,3)(beta-1,4)-D-Xylans, e.g. rhodymenans; Hemicellulose; Derivatives thereof
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/64—Paper recycling
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Biochemistry (AREA)
- Molecular Biology (AREA)
- Engineering & Computer Science (AREA)
- General Health & Medical Sciences (AREA)
- Materials Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Polysaccharides And Polysaccharide Derivatives (AREA)
Abstract
The invention discloses a method for extracting hemicellulose from chemi-mechanical pulp, which is characterized in that the hemicelluloses are extracted from the chemi-mechanical pulp, the chemi-mechanical pulp is soaked by sodium hydroxide, then solid-liquid separation treatment, nanofiltration membrane filtration treatment and inorganic ceramic membrane treatment are carried out, the extraction rate of the produced hemicelluloses can be improved, the hemicelluloses in the chemi-mechanical pulp are separated and purified, the subsequent high-value utilization is convenient, simultaneously, the alpha-cellulose ratio in the chemi-mechanical pulp is obviously improved along with the leaching of the hemicelluloses, and the paper pulp quality is improved.
Description
Technical Field
The invention relates to the field of hemicellulose, in particular to a method for extracting hemicellulose from chemi-mechanical pulp.
Background
The pulping by the chemical mechanical method adopts the pulping method of chemical pretreatment and mechanical grinding post-treatment, the chemical pretreatment is much milder than the cooking process of the pulping by the chemical method, the delignification effect on the raw material is smaller, the damage to the cellulose is less, and the yield is high. The resulting pulp has the advantages of high long fiber content and low fiber end rate, and is one of the mainstream pulp making methods in recent years. The chemi-mechanical pulp contains more hemicellulose, and is not well utilized in the papermaking industry, so that resource waste is caused.
The hemicellulose is one of the three elements in the wood and accounts for 15-20% of the solid content in the chemi-mechanical pulp. Hemicellulose is a heteromultimer composed of several different types of monosaccharides, these sugars being five-and six-carbon sugars, including xylose, arabinose, galactose, and the like. Hemicellulose xylan, which accounts for 50% of the total amount in the woody tissue, is bound to the surface of cellulose microfibrils and is interconnected, and these fibers constitute a rigid interconnected network of cells. The pure hemicellulose is light yellow, has better hydrophilicity, and is easier to absorb water and swell than the cellulose. In addition, the hemicellulose structure contains various five-carbon sugars, is easy to generate chemical reaction and modify, and can perform reactions such as esterification and etherification. The method can be used as a production raw material of various chemical products, for example, the method for producing alcohol by using hemicellulose as a raw material is a research hotspot at home and abroad.
At present, chemical-mechanical pulping processes are adopted by a plurality of domestic pulping and papermaking enterprises, a large amount of chemi-mechanical pulp is produced every year, and the hemicellulose in the chemi-mechanical pulp is not regarded as important. The pulping capacity of the chemi-mechanical pulp of hundreds of thousands of tons is possessed by the solar paper industry, the Juntai paper industry and the Qingshan paper industry, and the hemicellulose in the chemi-mechanical pulp is hardly utilized. There are many researches on hemicellulose extraction at home and abroad, but most of raw materials are corn stalks, moso bamboos, straws and the like.
Therefore, there is a need in the art to develop a process method for extracting hemicellulose from chemi-mechanical pulp, so as to realize efficient utilization of hemicellulose in the chemi-mechanical pulp and realize high-value utilization of resources.
Disclosure of Invention
The invention aims to solve the technical problems of low extraction rate, high unit cost, large three-waste generation amount and the like of extracting hemicellulose from conventional raw materials in the prior art. The quality of chemi-mechanical pulp after extracting hemicellulose is improved, and the bulk and whiteness of paper are increased to a certain degree. Meanwhile, the method also reduces the generation of solid waste, and the sodium hydroxide solution used for impregnation can be recycled in the pulping process, thereby greatly reducing the generation amount of waste liquid in the extraction process. And the chemi-mechanical pulp can be directly impregnated without pretreatment, the process flow is simple, the environmental pollution is reduced, the resource utilization rate is improved, and the extraction cost is reduced.
The raw material of the chemi-mechanical pulp used in the method is prepared by the most mainstream pulping method at present, the output of the chemi-mechanical pulp is high at home and abroad, the hemicellulose content is high, the chemi-mechanical pulp has general representativeness and is beneficial to subsequent popularization. Because the hemicellulose in the chemi-mechanical pulp is not valued, it is rarely utilized effectively at present. The hemicellulose in the pulp is extracted by creative labor, and the quality of the extracted pulp is improved to a great extent. The method also has the advantages of high efficiency, low cost and the like, and the generated waste liquid and waste residue can be recycled with little influence on the environment. Meanwhile, the prepared hemicellulose product has wide application range and certain popularization.
In order to achieve the purpose, the invention provides the following technical scheme:
a method for extracting hemicellulose from chemi-mechanical pulp is characterized by comprising the following steps:
(1) immersing the chemi-mechanical pulp in a sodium hydroxide solution with the concentration of 5-20% for 0.5-2h at the temperature of more than 30 ℃ to obtain a material A;
(2) performing solid-liquid separation treatment on the material A to obtain impregnated chemical pulp and an impregnating solution, and collecting the impregnating solution as a material B, wherein the hemicellulose content of the material B is 15-30 g/L;
(3) treating the material B with a nanofiltration membrane to obtain a concentrated solution and a filtrate, wherein the filtrate is a sodium hydroxide solution, returning to the previous process for reuse, and the obtained concentrated solution is a material C, the hemicellulose content of the material C is 45-90g/L, the temperature for nanofiltration membrane treatment is kept at about 50 ℃, and the transmembrane pressure is 1.5-2.0 Mpa;
(4) cooling the material C, adding acid to separate out hemicellulose to obtain a material D, wherein the pH value at the acid separation end point is 2-6;
(5) treating the material D with an inorganic ceramic membrane to obtain a concentrated solution and a filtrate, adding pure water for dialysis, and collecting the concentrated solution to obtain a material E, wherein the hemicellulose content of the material E is 90-200g/L, and the temperature for treating the inorganic ceramic membrane is 50 ℃; (6) and drying the material E to obtain a hemicellulose dry powder product, wherein the adopted drying method is spray drying.
Preferably, in the step (1), the chemi-mechanical pulp is prepared by performing two main process flows of chemical pretreatment and mechanical disintegration post-treatment on wood, wherein the wood is broadleaf wood, and preferably one or more of eucalyptus and poplar.
Preferably, in the step (2), the solid-liquid separation method is a centrifugal method; in the step (2), the aperture of the filter cloth adopted by the filter cloth of the centrifuge is 200-700 meshes.
Preferably, in the step (3), the aperture of the filter bag adopted for pretreatment is 5-20 μm; in the step (3), the nanofiltration membrane treatment adopts a nanofiltration membrane with the molecular weight cutoff of 300-; in the step (3), the temperature of the nanofiltration membrane treatment is 40-65 ℃; in the step (3), the membrane inlet pressure of the nanofiltration membrane treatment is 10-30 bar; and (3) filtering out the sodium hydroxide solution by using a nanofiltration membrane, and recycling.
Preferably, in the step (4), the acid type adopted by the acid precipitation is sulfuric acid, and the concentration is 30-60%; in the step (4), the PH value of the material D is 2-6.
Preferably, in the step (5), the inorganic ceramic membrane is adopted for the treatment, and the cut-off molecular weight of the inorganic ceramic membrane is 10000-40000; the temperature of the inorganic ceramic membrane treatment is 50-75 ℃; in the step (5), the membrane feeding pressure of the inorganic ceramic membrane treatment is 3-7 bar; the water adding amount of the water adding dialysis is 2-6 times of the total amount of the materials.
Preferably, in the step (6), the drying method adopted by the material E is spray drying; when the spray dryer is adopted for drying treatment in the step (6), the temperature of a steam inlet is 200-240 ℃; when a centrifugal spray dryer is used for drying treatment, the outlet temperature is 90-120 ℃. On the basis of the common knowledge in the field, the above preferred conditions can be combined randomly to obtain the preferred embodiments of the invention.
The reagents and starting materials used in the present invention are commercially available.
Compared with the prior art, the invention has the following beneficial effects: the method has the advantages that the chemi-mechanical pulp is used as the raw material for extracting hemicellulose, the raw material holding amount is large, the extraction efficiency is high, and the cost is low; the quality of the extracted paper pulp is improved, and the value of the paper pulp is improved; the production process has less three wastes and less environmental pollution.
Detailed Description
In the following examples and comparative examples, the chemi-mechanical pulp used was prepared from wood, which was hardwood, preferably one or more of eucalyptus and poplar, by two main process flows, chemical pre-treatment and mechanical post-disintegration treatment
In this example, the extraction of hemicellulose was performed using chemi-mechanical pulp. The chemical-mechanical pulp is adopted as a raw material, and the solid content of the chemical-mechanical pulp is 25%; the mass percentage of the hemicellulose in the solid matters of the chemi-mechanical pulp is 15 percent.
The hemicellulose content of the materials in the following examples was determined by COD method. And the COD method is that the sample to be detected is added with concentrated sulfuric acid and a potassium dichromate standard solution with a certain concentration for oxidation treatment for 10-30 min, water is added after treatment, and ammonium ferrous sulfate is used for back titration.
Example 1
Immersing chemical-mechanical pulp in a 5% sodium hydroxide solution at 30 ℃ for 1 hour, and then carrying out solid-liquid separation to obtain immersed chemical pulp and an immersion liquid, wherein the hemicellulose content of the immersion liquid is 15.2g/L, the concentration of the sodium hydroxide solution obtained by processing the immersion liquid with a nanofiltration membrane is 6.4%, the hemicellulose content of a concentrated solution is 61.3g/L, the temperature of the nanofiltration membrane processing is kept at 50 ℃, the transmembrane pressure is 1.5MPa, the pH value of a hemicellulose acidification end point is 6 after the concentrated solution is cooled and is added with acid to separate out hemicellulose, the hemicellulose content is 116g/L after the concentrated solution is concentrated by an inorganic ceramic membrane and is treated by adding 2 times of dialysis water, and then carrying out spray drying at 130 ℃ to obtain hemicellulose dry powder, and the effective content of the dry powder is about 87%.
Example 2
Soaking the chemi-mechanical pulp in 10% sodium hydroxide solution at 60 ℃ for 2h, and then carrying out solid-liquid separation to obtain soaked chemical pulp and soaking liquid, wherein the hemicellulose content of the soaking liquid is 26g/L, the concentration of the sodium hydroxide solution obtained by treating the soaking liquid with a nanofiltration membrane is 12.2%, the hemicellulose content of the concentrated liquid is 115 g/L, the temperature of the nanofiltration membrane treatment is kept at 50 ℃, the transmembrane pressure is 1.5MPa, the pH value of the hemicellulose acid precipitation end point is 6 after the concentrated liquid is cooled and acid is added, the hemicellulose content is 166g/L after the concentrated liquid is treated with 2 times of dialysis water, and the hemicellulose dry powder is obtained after the hemicellulose content is dried by spraying at 220 ℃, and the effective content of the dry powder is about 89%.
Example 3
Immersing chemical-mechanical pulp in a 5% sodium hydroxide solution at 30 ℃ for 1 hour, and then carrying out solid-liquid separation to obtain immersed chemical pulp and an immersion liquid, wherein the hemicellulose content of the immersion liquid is 15.2g/L, the concentration of the sodium hydroxide solution obtained by processing the immersion liquid with a nanofiltration membrane is 6.4%, the hemicellulose content of a concentrated solution is 61.3g/L, the temperature of the nanofiltration membrane processing is kept at 50 ℃, the transmembrane pressure is 1.5MPa, the pH value of a hemicellulose acidification end point is 6 after the concentrated solution is cooled and is added with acid to separate out hemicellulose, the hemicellulose content is 128g/L after the concentrated solution is concentrated by an inorganic ceramic membrane and is treated by 6 times of dialysis water, and spray drying is carried out at 130 ℃ to obtain hemicellulose dry powder, and the effective content of the dry powder is about 93%.
The embodiments of the present invention have been described in detail, but the embodiments are merely examples, and the present invention is not limited to the embodiments described above. Any equivalent modifications and substitutions to those skilled in the art are also within the scope of the present invention. Accordingly, equivalent alterations and modifications are intended to be included within the scope of the present invention, without departing from the spirit and scope of the invention.
Claims (7)
1. A method for extracting hemicellulose from chemi-mechanical pulp is characterized by comprising the following steps:
(1) immersing the chemi-mechanical pulp in a sodium hydroxide solution with the concentration of 5-20% for 0.5-2h at the temperature of more than 30 ℃ to obtain a material A;
(2) performing solid-liquid separation treatment on the material A to obtain impregnated chemical pulp and an impregnating solution, and collecting the impregnating solution as a material B, wherein the hemicellulose content of the material B is 15-30 g/L;
(3) treating the material B with a nanofiltration membrane to obtain a concentrated solution and a filtrate, wherein the filtrate is a sodium hydroxide solution, returning to the previous process for reuse, and the obtained concentrated solution is a material C, the hemicellulose content of the material C is 45-90g/L, the temperature of the nanofiltration membrane treatment is kept at about 50 ℃, and the transmembrane pressure is 1.5-2.0 Mpa;
(4) cooling the material C, adding acid to separate out hemicellulose to obtain a material D, wherein the pH value at the acid separation end point is 2-6;
(5) treating the material D with an inorganic ceramic membrane to obtain a concentrated solution and a filtrate, adding pure water for dialysis, and collecting the concentrated solution to obtain a material E, wherein the hemicellulose content of the material E is 90-200g/L, and the temperature for treating the inorganic ceramic membrane is 50 ℃; (6) and drying the material E to obtain the hemicellulose dry powder, wherein the adopted drying method is spray drying.
2. The method for extracting hemicellulose from chemi-mechanical pulp as claimed in claim 1, wherein in step (1), the chemi-mechanical pulp is prepared from wood by two main process flows of chemical pretreatment and mechanical grinding and post-treatment, and the wood is broadleaf wood, preferably one or more of eucalyptus and poplar.
3. The method for extracting hemicellulose from chemi-mechanical pulp according to claim 1, wherein in the step (2), the solid-liquid separation is performed by centrifugation; in the step (2), the aperture of the filter cloth adopted by the filter cloth of the centrifuge is 200-700 meshes.
4. The method for extracting hemicellulose from chemi-mechanical pulp as claimed in claim 1, wherein in the step (3), the aperture of the filter bag used for pretreatment is 5-20 μm; in the step (3), the nanofiltration membrane treatment adopts a nanofiltration membrane with the molecular weight cutoff of 300-; in the step (3), the temperature of the nanofiltration membrane treatment is 40-65 ℃; in the step (3), the membrane inlet pressure of the nanofiltration membrane treatment is 10-30 bar; and (3) filtering out the sodium hydroxide solution by using a nanofiltration membrane, and recycling.
5. The method for extracting hemicellulose from chemi-mechanical pulp according to claim 1, wherein in the step (4), the acid precipitation is performed by adding sulfuric acid with a concentration of 30-60%; in the step (4), the PH value of the material D is 2-6.
6. The method for extracting hemicellulose from chemi-mechanical pulp as claimed in claim 1, wherein in step (5), the inorganic ceramic membrane treatment employs inorganic ceramic membrane with molecular weight cut-off of 10000-; the temperature for treating the inorganic ceramic membrane is 50-75 ℃; in the step (5), the membrane inlet pressure of the inorganic ceramic membrane treatment is 3-7 bar; the water adding amount of the water adding dialysis is 2-6 times of the total amount of the materials.
7. The method for extracting hemicellulose from chemi-mechanical pulp as defined in claim 1, wherein in step (6), the drying method used for material E is spray drying; when the spray dryer is adopted for drying treatment in the step (6), the temperature of a steam inlet is 200-240 ℃; when a centrifugal spray dryer is used for drying treatment, the outlet temperature is 90-120 ℃.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120168102A1 (en) * | 2009-04-02 | 2012-07-05 | Sung-Hoon Yoon | Pulping process for quality protection including methods for hemicellulose extraction and treatment of hemicellulose-extracted lignocellulosic materials |
| CN114014957A (en) * | 2021-11-30 | 2022-02-08 | 上海昶法新材料有限公司 | Method for extracting hemicellulose from waste paper |
| CN114044836A (en) * | 2021-11-30 | 2022-02-15 | 上海昶法新材料有限公司 | Method for extracting hemicellulose from chemical pulp |
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- 2022-02-28 CN CN202210188627.9A patent/CN114736318A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120168102A1 (en) * | 2009-04-02 | 2012-07-05 | Sung-Hoon Yoon | Pulping process for quality protection including methods for hemicellulose extraction and treatment of hemicellulose-extracted lignocellulosic materials |
| CN114014957A (en) * | 2021-11-30 | 2022-02-08 | 上海昶法新材料有限公司 | Method for extracting hemicellulose from waste paper |
| CN114044836A (en) * | 2021-11-30 | 2022-02-15 | 上海昶法新材料有限公司 | Method for extracting hemicellulose from chemical pulp |
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