CN114014957A - Method for extracting hemicellulose from waste paper - Google Patents
Method for extracting hemicellulose from waste paper Download PDFInfo
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- CN114014957A CN114014957A CN202111438068.4A CN202111438068A CN114014957A CN 114014957 A CN114014957 A CN 114014957A CN 202111438068 A CN202111438068 A CN 202111438068A CN 114014957 A CN114014957 A CN 114014957A
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- 239000010893 paper waste Substances 0.000 title claims abstract description 74
- 229920002488 Hemicellulose Polymers 0.000 title claims abstract description 64
- 238000000034 method Methods 0.000 title claims abstract description 40
- 239000000463 material Substances 0.000 claims abstract description 119
- 239000012528 membrane Substances 0.000 claims abstract description 76
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 45
- 239000000919 ceramic Substances 0.000 claims abstract description 31
- 238000001728 nano-filtration Methods 0.000 claims abstract description 31
- 229920001131 Pulp (paper) Polymers 0.000 claims abstract description 25
- 238000011282 treatment Methods 0.000 claims abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 22
- 239000000706 filtrate Substances 0.000 claims abstract description 20
- 238000001035 drying Methods 0.000 claims abstract description 19
- 238000000502 dialysis Methods 0.000 claims abstract description 15
- 239000007788 liquid Substances 0.000 claims abstract description 15
- 238000000926 separation method Methods 0.000 claims abstract description 13
- 239000002699 waste material Substances 0.000 claims abstract description 10
- 238000010009 beating Methods 0.000 claims abstract description 7
- 238000001914 filtration Methods 0.000 claims abstract description 7
- 239000012535 impurity Substances 0.000 claims abstract description 7
- 239000000843 powder Substances 0.000 claims abstract description 7
- 239000002244 precipitate Substances 0.000 claims abstract description 7
- 238000002791 soaking Methods 0.000 claims abstract description 7
- 239000002253 acid Substances 0.000 claims abstract description 5
- 239000007921 spray Substances 0.000 claims description 16
- 239000002893 slag Substances 0.000 claims description 12
- 239000004744 fabric Substances 0.000 claims description 6
- 238000012545 processing Methods 0.000 claims description 6
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 6
- 238000007598 dipping method Methods 0.000 claims description 3
- 238000005470 impregnation Methods 0.000 abstract 3
- 238000004537 pulping Methods 0.000 description 6
- 238000000605 extraction Methods 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 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
- 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
- 229920002678 cellulose Polymers 0.000 description 2
- 239000001913 cellulose Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 235000003570 Phyllostachys pubescens Nutrition 0.000 description 1
- 244000302661 Phyllostachys pubescens Species 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
- 239000003513 alkali Substances 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
- 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
- 230000009286 beneficial effect Effects 0.000 description 1
- 210000004027 cell Anatomy 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 235000005822 corn Nutrition 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003912 environmental pollution Methods 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
- 238000002474 experimental method Methods 0.000 description 1
- 229930182830 galactose Natural products 0.000 description 1
- 210000001724 microfibril Anatomy 0.000 description 1
- 150000002772 monosaccharides Chemical class 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 239000010902 straw Substances 0.000 description 1
- 150000008163 sugars Chemical class 0.000 description 1
- 210000001519 tissue Anatomy 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
- 229920001221 xylan Polymers 0.000 description 1
- 150000004823 xylans Chemical class 0.000 description 1
Classifications
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- 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
- C08B37/0003—General processes for their isolation or fractionation, e.g. purification or extraction from biomass
-
- 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
- C08B37/006—Heteroglycans, i.e. polysaccharides having more than one sugar residue in the main chain in either alternating or less regular sequence; Gellans; Succinoglycans; Arabinogalactans; Tragacanth or gum tragacanth or traganth from Astragalus; Gum Karaya from Sterculia urens; Gum Ghatti from Anogeissus latifolia; Derivatives thereof
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- 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)
- Sustainable Development (AREA)
- Paper (AREA)
- Polysaccharides And Polysaccharide Derivatives (AREA)
Abstract
The invention discloses a method for extracting hemicellulose from waste paper, which specifically comprises the following steps: step 1) dispersing and beating waste paper into waste paper pulp by a hydrapulper, and filtering to remove non-paper pulp impurities; step 2) soaking the waste paper pulp filtered in the step 1) in 5-20% sodium hydroxide solution for 0.5-4 h to obtain a material A; step 3) performing solid-liquid separation treatment on the material A to obtain waste paper and impregnation liquid after impregnation, and collecting the impregnation liquid as a material B; step 4), pretreating the material B by using a filter bag, then treating by using a nanofiltration membrane to obtain concentrated solution and filtrate, and collecting the concentrated solution as a material C; step 5), adding acid into the material C to obtain a precipitate which is a material D; and 6) treating the material D by a ceramic membrane to obtain a concentrated solution and a filtrate, adding pure water for dialysis, collecting the concentrated solution to obtain a material E, and drying the material E in the step 7) to obtain hemicellulose dry powder. The invention has the advantages of high efficiency, low cost, no generation of three wastes, small influence on environment and the like.
Description
Technical Field
The invention relates to the technical field of resource recycling, in particular to a method for extracting hemicellulose from waste paper.
Background
The waste paper is a part recycled and reutilized after being used, is rich in waste paper resources, needs to be treated, and is lower in price and easier to obtain than paper pulp. The domestic paper pulp yield is limited, a large gap exists, a large amount of waste paper needs to be imported and recycled to produce packaging paper and cultural paper, the waste paper pulping is one of the mainstream pulping methods in recent years in China, and the treatment amount of the waste paper pulping accounts for more than 50% of the total paper pulp amount. The waste paper contains more hemicellulose, the yield of the waste paper is high, and other efficient utilization ways need to be developed besides being reused for papermaking.
Hemicellulose is one of three elements in wood and has higher content in waste paper. 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 pulping processes are adopted by a plurality of domestic pulping and papermaking enterprises, a large amount of waste paper is produced every year, and the semi-fiber is not paid attention. The solar paper industry, the Juntai paper industry and the Qingshan paper industry have hundreds of thousands of tons of waste paper pulping capacity, and the hemicellulose in the waste paper is hardly utilized. Many researches on hemicellulose extraction exist at home and abroad, but most of raw materials are corn stalks, moso bamboos, straws and the like, the hemicellulose extraction rate is low, the unit cost is high, and the three wastes generation amount is large.
Therefore, there is a need in the art to develop a process method for extracting hemicellulose from waste paper, so as to realize efficient utilization of hemicellulose in waste paper and realize high-value utilization of resources.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, it is an object of the present invention to provide a method for extracting hemicellulose from waste paper.
The purpose of the invention is realized by the following technical scheme:
a method for extracting hemicellulose from waste paper specifically comprises the following steps:
step 1) dispersing and beating the waste paper into waste paper pulp by a hydrapulper at the temperature of 30-60 ℃, wherein the pulp concentration is 3-6%, and filtering to remove non-paper pulp impurities;
step 2) soaking the waste paper pulp filtered in the step 1) in 5-20% sodium hydroxide solution at the temperature of 40-80 ℃ for 0.5-4 h to obtain a material A;
step 3) performing solid-liquid separation treatment on the material A to obtain waste paper and steeping liquor after steeping, and collecting the steeping liquor as a material B, wherein the hemicellulose content of the material B is 10g/L-20 g/L;
step 4) pretreating the material B by using a filter bag and then treating the material B by using a nanofiltration membrane to obtain concentrated solution and filtrate, wherein the filtrate is sodium hydroxide solution and is recycled, the collected concentrated solution is material C, the hemicellulose content of the material C is 50-70 g/L, the aperture of the filter bag is 5-20 mu m, the interception molecular weight of the nanofiltration membrane is 300-3000, the temperature for treating the nanofiltration membrane is 40-70 ℃, and the membrane inlet pressure for treating the nanofiltration membrane is 10-30 bar;
step 5), adding acid into the material C to obtain a precipitate which is a material D, wherein the PH value of the material D is 2-7;
step 6) treating the material D by a ceramic membrane to obtain a concentrated solution and a filtrate, adding pure water for dialysis, and collecting the concentrated solution as a material E, wherein the hemicellulose content of the material E is 120-200 g/L, the cut-off molecular weight of the ceramic membrane is 10000-40000, the treatment temperature of the ceramic membrane is 60-90 ℃, the membrane inlet pressure of the ceramic membrane is 3-9 bar, and the water adding amount for dialysis is 2-7 times of the total amount of the material;
and 7) drying the material E to obtain hemicellulose dry powder.
Further, the temperature in the step 1) is 40-60 ℃, and the waste paper is one or more of national waste or American waste.
Further, the temperature in the step 2) is 50-70 ℃, the concentration of the sodium hydroxide solution is 8-15%, and the dipping time is 1-3 h.
Further, an automatic slag discharge centrifuge is adopted in the solid-liquid separation treatment in the step 3), and the aperture of filter cloth of the automatic slag discharge centrifuge is 200-700 meshes, preferably 300-500 meshes.
Further, the aperture of the filter bag in the step 4) is 5-15 μm, the cut-off molecular weight of the nanofiltration membrane is 500-2000, the temperature for processing the nanofiltration membrane is 50-70 ℃, and the pressure for processing the nanofiltration membrane is 15-25 bar.
Further, the acid in the step 5) is concentrated sulfuric acid; the PH of the material D is 3-6.
Further, the molecular weight cut-off of the ceramic membrane in the step 6) is 15000-30000, the processing temperature of the ceramic membrane is 65-75 ℃, the membrane feeding pressure of the ceramic membrane is 5-8 bar, and the water adding amount for dialysis by adding water is 3-6 times of the total amount of the materials.
Further, in the step 7), the material E is dried by a spray dryer, and when the spray dryer is used for drying, the air inlet temperature is 240-300 ℃, preferably 260-300 ℃.
Further, in the step 7), the material E is dried by a centrifugal spray dryer, and when the centrifugal spray dryer is used for drying, the air outlet temperature is 80-120 ℃, preferably 95-115 ℃.
The invention also aims to provide the hemicellulose prepared by the method for extracting the hemicellulose from the waste paper.
The invention has the outstanding effects that:
the method for extracting hemicellulose from waste paper adopts widely available waste paper as a raw material, has high hemicellulose content and general representativeness, and is beneficial to subsequent popularization; the waste paper pulp after the hemicellulose is extracted can directly enter downstream without special treatment, so that the generation of solid waste is reduced, alkali liquor in the dipping process can be recycled in a system, and the generation amount of waste liquor in the extraction process is greatly reduced; and the waste paper can be directly impregnated without other treatments after being subjected to a simple pretreatment process, so that the process flow is simplified, the resource utilization rate is improved, the environmental pollution is reduced, the extraction cost is reduced, and the method has the advantages of high efficiency, low cost, no generation of three wastes, small influence on the environment and the like. Meanwhile, the prepared hemicellulose product has wide application range and certain popularization.
The following detailed description of the embodiments of the present invention is provided in connection with the examples to facilitate understanding and understanding of the technical solutions of the present invention.
Detailed Description
The process of the present invention is illustrated below by means of specific examples, but the present invention is not limited thereto. The experimental methods described in the following examples are all conventional methods unless otherwise specified; the reagents and materials are commercially available, unless otherwise specified.
Example 1
The method for extracting hemicellulose from waste paper comprises the following steps:
step 1) dispersing and beating the waste paper into waste paper pulp by a hydrapulper at the temperature of 30 ℃, wherein the pulp concentration is 3%, and filtering to remove non-paper pulp impurities; waste paper is national waste;
step 2) soaking the waste paper pulp filtered in the step 1) in a 5% sodium hydroxide solution at the temperature of 40 ℃ for 0.5h to obtain a material A;
step 3) performing solid-liquid separation treatment on the material A, wherein an automatic slag discharge centrifuge is adopted in the solid-liquid separation treatment, the aperture of filter cloth of the automatic slag discharge centrifuge is 200 meshes, impregnated waste paper and impregnating solution are obtained, the impregnating solution is collected to be a material B, and the hemicellulose content of the material B is 10 g/L;
step 4) pretreating the material B by using a filter bag and then treating the material B by using a nanofiltration membrane to obtain concentrated solution and filtrate, wherein the filtrate is sodium hydroxide solution and is recycled, the collected concentrated solution is material C, the hemicellulose content of the material C is 50g/L, the aperture of the filter bag is 5 mu m, the intercepted molecular weight of the nanofiltration membrane is 300, the temperature for treating the nanofiltration membrane is 40 ℃, and the membrane inlet pressure for treating the nanofiltration membrane is 10 bar;
step 5), adding concentrated sulfuric acid into the material C to obtain a precipitate which is a material D, wherein the PH value of the material D is 2;
step 6) treating the material D by a 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 120g/L, the cut-off molecular weight of the ceramic membrane is 10000, the temperature for ceramic membrane treatment is 60 ℃, the membrane inlet pressure of the ceramic membrane is 3bar, and the water adding amount for water dialysis is 2 times of the total amount of the material;
and 7) drying the material E to obtain hemicellulose dry powder, drying the material E by using a spray dryer, and controlling the air inlet temperature to be 240 ℃ when the spray dryer is used for drying.
Example 2
The method for extracting hemicellulose from waste paper comprises the following steps:
step 1) dispersing and beating the waste paper into waste paper pulp by a hydrapulper at the temperature of 40 ℃, wherein the pulp concentration is 3.5%, and filtering to remove non-paper pulp impurities; waste paper is national waste;
step 2) soaking the waste paper pulp filtered in the step 1) in 8% sodium hydroxide solution at the temperature of 50 ℃ for 1h to obtain a material A;
step 3) performing solid-liquid separation treatment on the material A, wherein an automatic slag discharge centrifuge is adopted in the solid-liquid separation treatment, the aperture of filter cloth of the automatic slag discharge centrifuge is 300 meshes, impregnated waste paper and impregnating solution are obtained, the impregnating solution is collected to be a material B, and the hemicellulose content of the material B is 15 g/L;
step 4) pretreating the material B by using a filter bag and then treating the material B by using a nanofiltration membrane to obtain concentrated solution and filtrate, wherein the filtrate is sodium hydroxide solution and is recycled, the collected concentrated solution is material C, the hemicellulose content of the material C is 60g/L, the aperture of the filter bag is 5 mu m, the intercepted molecular weight of the nanofiltration membrane is 500, the temperature for treating the nanofiltration membrane is 50 ℃, and the membrane inlet pressure for treating the nanofiltration membrane is 15 bar;
step 5), adding concentrated sulfuric acid into the material C to obtain a precipitate which is a material D, wherein the pH value of the material D is 3;
step 6), treating the material D by a 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 140g/L, the cut-off molecular weight of the ceramic membrane is 15000, the treatment temperature of the ceramic membrane is 65 ℃, the membrane feeding pressure of the ceramic membrane is 5bar, and the water adding amount for dialysis by adding water is 3 times of the total amount of the material;
and 7) drying the material E to obtain hemicellulose dry powder, drying the material E by using a spray dryer, and controlling the air inlet temperature to be 300 ℃ when the spray dryer is used for drying.
Example 3
The method for extracting hemicellulose from waste paper comprises the following steps:
step 1) dispersing and beating the waste paper into waste paper pulp by a hydrapulper at the temperature of 50 ℃, wherein the pulp concentration is 5.5%, and filtering to remove non-paper pulp impurities; the waste paper is waste paper;
step 2) soaking the waste paper pulp filtered in the step 1) in 15% sodium hydroxide solution at the temperature of 70 ℃ for 3 hours to obtain a material A;
step 3) performing solid-liquid separation treatment on the material A, wherein an automatic slag discharge centrifuge is adopted in the solid-liquid separation treatment, the aperture of filter cloth of the automatic slag discharge centrifuge is 500 meshes, impregnated waste paper and impregnating solution are obtained, the impregnating solution is collected to be a material B, and the hemicellulose content of the material B is 19 g/L;
step 4) pretreating the material B by using a filter bag and then treating the material B by using a nanofiltration membrane to obtain concentrated solution and filtrate, wherein the filtrate is sodium hydroxide solution and is recycled, the collected concentrated solution is material C, the hemicellulose content of the material C is 68g/L, the aperture of the filter bag is 15 mu m, the intercepted molecular weight of the nanofiltration membrane is 2000, the temperature for treating the nanofiltration membrane is 60 ℃, and the membrane inlet pressure for treating the nanofiltration membrane is 25 bar;
step 5), adding concentrated sulfuric acid into the material C to obtain a precipitate which is a material D, wherein the pH value of the material D is 6;
step 6) treating the material D by a ceramic membrane to obtain a concentrated solution and a filtrate, adding pure water for dialysis, and collecting the concentrated solution to be a material E, wherein the hemicellulose content of the material E is 170g/L, the cut-off molecular weight of the ceramic membrane is 30000, the temperature for ceramic membrane treatment is 75 ℃, the membrane inlet pressure of the ceramic membrane is 8bar, and the water adding amount for water dialysis is 6 times of the total amount of the material;
and 7) drying the material E to obtain hemicellulose dry powder, drying the material E by using a centrifugal spray dryer, and controlling the air outlet temperature to be 80 ℃ when the centrifugal spray dryer is used for drying.
Example 4
The method for extracting hemicellulose from waste paper comprises the following steps:
step 1) dispersing and beating the waste paper into waste paper pulp by a hydrapulper at the temperature of 60 ℃, wherein the pulp concentration is 6%, and filtering to remove non-paper pulp impurities; the waste paper is waste paper;
step 2) soaking the waste paper pulp filtered in the step 1) in 20% sodium hydroxide solution at the temperature of 80 ℃ for 4h to obtain a material A;
step 3) performing solid-liquid separation treatment on the material A, wherein an automatic slag discharge centrifuge is adopted in the solid-liquid separation treatment, the aperture of filter cloth of the automatic slag discharge centrifuge is 700 meshes, impregnated waste paper and impregnating solution are obtained, the impregnating solution is collected to be a material B, and the hemicellulose content of the material B is 20 g/L;
step 4) pretreating the material B by using a filter bag and then treating the material B by using a nanofiltration membrane to obtain concentrated solution and filtrate, wherein the filtrate is sodium hydroxide solution and is recycled, the collected concentrated solution is material C, the hemicellulose content of the material C is 70g/L, the aperture of the filter bag is 20 mu m, the intercepted molecular weight of the nanofiltration membrane is 3000, the temperature for treating the nanofiltration membrane is 70 ℃, and the membrane inlet pressure for treating the nanofiltration membrane is 30 bar;
step 5), adding concentrated sulfuric acid into the material C to obtain a precipitate which is a material D, wherein the pH value of the material D is 7;
step 6), treating the material D by a ceramic membrane to obtain a concentrated solution and a filtrate, adding pure water for dialysis, and collecting the concentrated solution to be a material E, wherein the hemicellulose content of the material E is 200g/L, the cut-off molecular weight of the ceramic membrane is 40000, the treatment temperature of the ceramic membrane is 90 ℃, the membrane feeding pressure of the ceramic membrane is 9bar, and the water adding amount for dialysis by adding water is 7 times of the total amount of the material;
and 7) drying the material E to obtain hemicellulose dry powder, drying the material E by using a centrifugal spray dryer, and controlling the air outlet temperature to be 120 ℃ when the centrifugal spray dryer is used for drying.
The invention has various embodiments, and all technical solutions formed by adopting equivalent transformation or equivalent transformation are within the protection scope of the invention.
Claims (10)
1. A method for extracting hemicellulose from waste paper is characterized by comprising the following steps:
step 1) dispersing and beating the waste paper into waste paper pulp by a hydrapulper at the temperature of 30-60 ℃, wherein the pulp concentration is 3-6%, and filtering to remove non-paper pulp impurities;
step 2) soaking the waste paper pulp filtered in the step 1) in 5-20% sodium hydroxide solution at the temperature of 40-80 ℃ for 0.5-4 h to obtain a material A;
step 3) performing solid-liquid separation treatment on the material A to obtain waste paper and steeping liquor after steeping, and collecting the steeping liquor as a material B, wherein the hemicellulose content of the material B is 10g/L-20 g/L;
step 4) pretreating the material B by using a filter bag and then treating the material B by using a nanofiltration membrane to obtain concentrated solution and filtrate, wherein the filtrate is sodium hydroxide solution and is recycled, the collected concentrated solution is material C, the hemicellulose content of the material C is 50-70 g/L, the aperture of the filter bag is 5-20 mu m, the interception molecular weight of the nanofiltration membrane is 300-3000, the temperature for treating the nanofiltration membrane is 40-70 ℃, and the membrane inlet pressure for treating the nanofiltration membrane is 10-30 bar;
step 5), adding acid into the material C to obtain a precipitate which is a material D, wherein the PH value of the material D is 2-7;
step 6) treating the material D by a ceramic membrane to obtain a concentrated solution and a filtrate, adding pure water for dialysis, and collecting the concentrated solution as a material E, wherein the hemicellulose content of the material E is 120-200 g/L, the cut-off molecular weight of the ceramic membrane is 10000-40000, the treatment temperature of the ceramic membrane is 60-90 ℃, the membrane inlet pressure of the ceramic membrane is 3-9 bar, and the water adding amount for dialysis is 2-7 times of the total amount of the material;
and 7) drying the material E to obtain hemicellulose dry powder.
2. The method for extracting hemicellulose from waste paper according to claim 1, wherein the method comprises the following steps: the temperature in the step 1) is 40-60 ℃, and the waste paper is one or more of national waste or American waste.
3. The method for extracting hemicellulose from waste paper according to claim 1, wherein the method comprises the following steps: the temperature in the step 2) is 50-70 ℃, the concentration of the sodium hydroxide solution is 8-15%, and the dipping time is 1-3 h.
4. The method for extracting hemicellulose from waste paper according to claim 1, wherein the method comprises the following steps: and 3) adopting an automatic slag discharge centrifuge in the solid-liquid separation treatment, wherein the aperture of filter cloth of the automatic slag discharge centrifuge is 200-700 meshes, and preferably 300-500 meshes.
5. The method for extracting hemicellulose from waste paper according to claim 1, wherein the method comprises the following steps: in the step 4), the aperture of the filter bag is 5-15 μm, the molecular weight cut-off of the nanofiltration membrane is 500-2000, the temperature for processing the nanofiltration membrane is 50-70 ℃, and the pressure for processing the nanofiltration membrane is 15-25 bar.
6. The method for extracting hemicellulose from waste paper according to claim 1, wherein the method comprises the following steps: the acid in the step 5) is concentrated sulfuric acid; the PH of the material D is 3-6.
7. The method for extracting hemicellulose from waste paper according to claim 1, wherein the method comprises the following steps: the molecular weight cut-off of the ceramic membrane in the step 6) is 15000-30000, the processing temperature of the ceramic membrane is 65-75 ℃, the membrane feeding pressure of the ceramic membrane is 5-8 bar, and the water adding amount for dialysis by adding water is 3-6 times of the total amount of the materials.
8. The method for extracting hemicellulose from waste paper according to claim 1, wherein the method comprises the following steps: in the step 7), the material E is dried by a spray dryer, and when the spray dryer is used for drying treatment, the air inlet temperature is 240-300 ℃, preferably 260-300 ℃.
9. The method for extracting hemicellulose from waste paper according to claim 1, wherein the method comprises the following steps: in the step 7), the material E is dried by adopting a centrifugal spray dryer, and when the centrifugal spray dryer is used for drying treatment, the air outlet temperature is 80-120 ℃, and preferably 95-115 ℃.
10. Hemicellulose produced by the process for extracting hemicellulose from waste paper according to any one of claims 1-9.
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| CN202111438068.4A CN114014957A (en) | 2021-11-30 | 2021-11-30 | Method for extracting hemicellulose from waste paper |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114736318A (en) * | 2022-02-28 | 2022-07-12 | 上海昶法新材料有限公司 | Method for extracting hemicellulose from chemi-mechanical pulp |
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| US3935022A (en) * | 1973-07-23 | 1976-01-27 | Hannes Sihtola | Method for the removal of hemicellulose from hemicellulose-containing caustic liquors |
| CN1450001A (en) * | 2003-05-15 | 2003-10-22 | 凯能高科技工程（上海）有限公司 | Method for recovering alkali and hemicellulose from chemical fibre waste liquid |
| CN104532645A (en) * | 2014-11-11 | 2015-04-22 | 浙江理工大学 | Method for preparing nano-grade microcrystalline cellulose with waste corrugated board as raw material |
| CN105714590A (en) * | 2016-04-15 | 2016-06-29 | 广西科学院 | Method for separating lignin and hemicellulose from papermaking black liquor and recycling alkali liquor |
| CN105970709A (en) * | 2016-05-27 | 2016-09-28 | 西安科技大学 | Method of separating high-purity cellulose from print waste paper |
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| US3935022A (en) * | 1973-07-23 | 1976-01-27 | Hannes Sihtola | Method for the removal of hemicellulose from hemicellulose-containing caustic liquors |
| CN1450001A (en) * | 2003-05-15 | 2003-10-22 | 凯能高科技工程（上海）有限公司 | Method for recovering alkali and hemicellulose from chemical fibre waste liquid |
| CN104532645A (en) * | 2014-11-11 | 2015-04-22 | 浙江理工大学 | Method for preparing nano-grade microcrystalline cellulose with waste corrugated board as raw material |
| CN105714590A (en) * | 2016-04-15 | 2016-06-29 | 广西科学院 | Method for separating lignin and hemicellulose from papermaking black liquor and recycling alkali liquor |
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| CN114736318A (en) * | 2022-02-28 | 2022-07-12 | 上海昶法新材料有限公司 | Method for extracting hemicellulose from chemi-mechanical pulp |
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