CN116874105A - Method for extracting xylose from dissolving pulp papermaking waste liquid - Google Patents
Method for extracting xylose from dissolving pulp papermaking waste liquid Download PDFInfo
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- CN116874105A CN116874105A CN202310823052.8A CN202310823052A CN116874105A CN 116874105 A CN116874105 A CN 116874105A CN 202310823052 A CN202310823052 A CN 202310823052A CN 116874105 A CN116874105 A CN 116874105A
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- Prior art keywords
- xylose
- dissolving pulp
- waste liquid
- paper making
- filtrate
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Links
- SRBFZHDQGSBBOR-IOVATXLUSA-N D-xylopyranose Chemical compound O[C@@H]1COC(O)[C@H](O)[C@H]1O SRBFZHDQGSBBOR-IOVATXLUSA-N 0.000 title claims abstract description 122
- PYMYPHUHKUWMLA-UHFFFAOYSA-N arabinose Natural products OCC(O)C(O)C(O)C=O PYMYPHUHKUWMLA-UHFFFAOYSA-N 0.000 title claims abstract description 61
- SRBFZHDQGSBBOR-UHFFFAOYSA-N beta-D-Pyranose-Lyxose Natural products OC1COC(O)C(O)C1O SRBFZHDQGSBBOR-UHFFFAOYSA-N 0.000 title claims abstract description 61
- 239000007788 liquid Substances 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 43
- 229920000875 Dissolving pulp Polymers 0.000 title claims abstract description 36
- 239000002699 waste material Substances 0.000 title claims abstract description 35
- 239000000463 material Substances 0.000 claims abstract description 43
- 239000012528 membrane Substances 0.000 claims abstract description 28
- 239000000706 filtrate Substances 0.000 claims abstract description 21
- 239000000047 product Substances 0.000 claims abstract description 19
- 238000000108 ultra-filtration Methods 0.000 claims abstract description 17
- 239000000919 ceramic Substances 0.000 claims abstract description 16
- 229920005610 lignin Polymers 0.000 claims abstract description 16
- 230000001376 precipitating effect Effects 0.000 claims abstract description 9
- 239000006228 supernatant Substances 0.000 claims abstract description 8
- 239000002253 acid Substances 0.000 claims abstract description 6
- 238000012545 processing Methods 0.000 claims abstract description 3
- 239000007787 solid Substances 0.000 claims description 17
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid group Chemical group S(O)(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 11
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 7
- 239000004744 fabric Substances 0.000 claims description 6
- 238000004821 distillation Methods 0.000 claims description 5
- 230000007062 hydrolysis Effects 0.000 claims description 5
- 238000006460 hydrolysis reaction Methods 0.000 claims description 5
- 239000011148 porous material Substances 0.000 claims description 2
- 238000001556 precipitation Methods 0.000 claims description 2
- 230000008901 benefit Effects 0.000 abstract description 6
- 238000006243 chemical reaction Methods 0.000 abstract description 2
- 239000000243 solution Substances 0.000 description 8
- 239000002994 raw material Substances 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 239000003513 alkali Substances 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 238000004537 pulping Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000005406 washing Methods 0.000 description 3
- 239000002351 wastewater Substances 0.000 description 3
- 241000196324 Embryophyta Species 0.000 description 2
- TVXBFESIOXBWNM-UHFFFAOYSA-N Xylitol Natural products OCCC(O)C(O)C(O)CCO TVXBFESIOXBWNM-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- HEBKCHPVOIAQTA-UHFFFAOYSA-N meso ribitol Natural products OCC(O)C(O)C(O)CO HEBKCHPVOIAQTA-UHFFFAOYSA-N 0.000 description 2
- 238000001728 nano-filtration Methods 0.000 description 2
- 239000000123 paper Substances 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
- 239000002244 precipitate Substances 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 235000010447 xylitol Nutrition 0.000 description 2
- 239000000811 xylitol Substances 0.000 description 2
- HEBKCHPVOIAQTA-SCDXWVJYSA-N xylitol Chemical compound OC[C@H](O)[C@@H](O)[C@H](O)CO HEBKCHPVOIAQTA-SCDXWVJYSA-N 0.000 description 2
- 229960002675 xylitol Drugs 0.000 description 2
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 1
- 235000017491 Bambusa tulda Nutrition 0.000 description 1
- 229920000742 Cotton Polymers 0.000 description 1
- 229920002488 Hemicellulose Polymers 0.000 description 1
- 244000082204 Phyllostachys viridis Species 0.000 description 1
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 1
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 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
- 239000011425 bamboo Substances 0.000 description 1
- 238000004061 bleaching Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 235000005822 corn Nutrition 0.000 description 1
- 238000004042 decolorization Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000029087 digestion Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000000605 extraction 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
- 235000003599 food sweetener Nutrition 0.000 description 1
- 150000004676 glycans Chemical class 0.000 description 1
- 239000010903 husk Substances 0.000 description 1
- 238000005984 hydrogenation reaction Methods 0.000 description 1
- 239000000413 hydrolysate Substances 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 239000002655 kraft paper Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 150000002972 pentoses Chemical class 0.000 description 1
- 229920001282 polysaccharide Polymers 0.000 description 1
- 239000005017 polysaccharide Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000012086 standard solution Substances 0.000 description 1
- 238000010025 steaming Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000003765 sweetening agent Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C13—SUGAR INDUSTRY
- C13K—SACCHARIDES OBTAINED FROM NATURAL SOURCES OR BY HYDROLYSIS OF NATURALLY OCCURRING DISACCHARIDES, OLIGOSACCHARIDES OR POLYSACCHARIDES
- C13K13/00—Sugars not otherwise provided for in this class
- C13K13/002—Xylose
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/38—Treatment of water, waste water, or sewage by centrifugal separation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/26—Nature of the water, waste water, sewage or sludge to be treated from the processing of plants or parts thereof
- C02F2103/28—Nature of the water, waste water, sewage or sludge to be treated from the processing of plants or parts thereof from the paper or cellulose industry
Abstract
The invention discloses a method for extracting xylose from dissolving pulp papermaking waste liquid, which specifically comprises the following steps: (1) Standing and precipitating the dissolving pulp papermaking waste liquid in a container, and taking a supernatant as a material A; (2) Adding acid into the material A to separate out lignin, and processing the lignin by a centrifugal machine to obtain filtrate which is recorded as a material B; (3) Treating the material B by a ceramic ultrafiltration membrane to obtain concentrated solution and filtrate, and marking the filtrate as a material C; and (4) concentrating the material C to obtain a xylose product. The method has the advantages of simple process flow, mild reaction, low requirement on equipment, less three-waste generation, small influence on environment, wide application range of products and obvious economic and social benefits.
Description
Technical Field
The invention belongs to the field of papermaking and xylose, and particularly relates to a method for extracting xylose from dissolving pulp papermaking waste liquid.
Background
The production of dissolving pulp with timber and bamboo as material includes two processes, acid sulfite process and prehydrolysis sulfate process. The former is a traditional production process, and it is difficult to produce high-purity dissolving pulp, and the quality of the pulp is not well controlled. Thus, both newly built and expanded dissolving pulp plants basically employ the latter. The prehydrolysis sulfate process to produce dissolving pulp includes mainly prehydrolysis, steaming, washing, sieving, purifying, bleaching and other technological steps. Wherein hemicellulose is mainly removed in the prehydrolysis stage, lignin is mainly removed in the kraft digestion stage, the pulp is purified, and the pulp viscosity is adjusted. The prehydrolysis stage can produce a large amount of prehydrolysis liquid, and the treatment mode at the current stage mainly comprises spraying alkali into an alkali furnace for treatment at the alkali recovery stage. However, the content of solid matters in the pre-hydrolyzed liquid is low, so that the pressure of an alkali furnace is high, the economic benefit is poor, and a large amount of xylose in the pre-hydrolyzed liquid is not well utilized, so that the resource waste is caused.
At present, a large amount of prehydrolysis liquid is produced every year by a plurality of domestic pulping and papermaking enterprises which adopt the prehydrolysis sulfate method to produce dissolving pulp, and xylose in the pulp is not well utilized. The solar paper industry, the morning paper industry and the like have large-volume dissolving pulp pulping capacity, and xylose in hydrolysate produced by the dissolving pulp pulping capacity is hardly utilized.
Xylose is used as one of the main components in the prehydrolysis liquid, and accounts for about 70-75% of the solid content. Xylose is a pentose. Natural xylose is present in plants in the form of polysaccharides. Since they are particularly abundant in the waste parts of agricultural products (e.g. cobs of corn, stalks, husks of cotton bolls), their use has been of great interest since ancient times. The xylose has wide application, can be used as raw materials for producing xylitol, sweeteners, feed raw materials and the like, and for example, the hydrogenation production of xylitol by taking xylose as a raw material is always a domestic research hot spot.
Therefore, development of a method for extracting xylose from dissolving pulp papermaking waste liquid is needed in the field, so that efficient utilization of xylose in the pre-hydrolysis liquid is realized, and high-value utilization of resources is realized.
The raw material prehydrolysis liquid used in the invention is prepared by the mainstream prehydrolysis sulfate pulping method at present. The dissolving pulp has larger output at home and abroad, high product value, universal representativeness and is beneficial to subsequent popularization. Xylose in the prehydrolysis liquid is not paid attention, so that effective utilization of the xylose is rarely performed at present. The invention can extract xylose through creative labor. The method has the advantages of high efficiency, low cost and the like, and the generated waste liquid and waste residue can be reused, so that the method has little influence on the environment. Meanwhile, the prepared xylose product has wider application and certain popularization.
Disclosure of Invention
The invention aims to solve the technical problem that xylose in the prehydrolysis liquid cannot be well utilized in the prior art. Xylose in the prehydrolysis liquid is effectively extracted and utilized, so that the pressure in the alkali recovery stage is reduced, and a larger space is provided for dissolving pulp productivity. Meanwhile, the xylose extracted by the method has high purity, simple process flow and little environmental pollution, improves the utilization rate of resources and reduces the extraction cost.
In order to achieve the above object, the present invention provides the following technical solutions:
the method for extracting xylose from the dissolving pulp papermaking waste liquid comprises the following steps:
(1) Standing and precipitating the dissolving pulp papermaking waste liquid in a container, and taking a supernatant as a material A;
(2) Adding acid into the material A to separate out lignin, and processing the lignin by a centrifugal machine to obtain filtrate which is recorded as a material B;
(3) Treating the material B by a ceramic ultrafiltration membrane to obtain concentrated solution and filtrate, and marking the filtrate as a material C;
(4) Concentrating the material C to obtain a xylose product.
Preferably, in the step (1), the papermaking waste liquid of the dissolving pulp is the papermaking waste liquid generated in the prehydrolysis section of the dissolving pulp produced by the prehydrolysis sulfate method; the standing and precipitating time is at least 48 hours.
Preferably, in the step (2), the acid form is sulfuric acid, and the end point pH of lignin precipitation is 1-5.
Preferably, in the step (2), the filter cloth pore diameter of the centrifugal machine is 200-700 meshes.
Preferably, in the step (3), the molecular weight cut-off of the ceramic ultrafiltration membrane is 10000-30000; the temperature of the ultrafiltration membrane treatment is 50-70 ℃; the membrane feeding pressure of the ceramic membrane treatment is 0.5-0.7MPa. Wherein the ultrafiltration membrane has the function of increasing xylose concentration and simultaneously removing inorganic salts such as sodium sulfate and other materials.
Preferably, in the step (3), the solid content in the material C is 5-10%.
Preferably, in the step (4), the concentration adopts negative pressure distillation, the vacuum degree is 0.06-0.1MPa, and the temperature is 60-100 ℃.
Preferably, in the step (4), the solid content of the obtained xylose product liquid is 35-45%, and the xylose content in the solid is more than 85%.
On the basis of conforming to the common knowledge in the field, the above preferred conditions can be arbitrarily combined to obtain the preferred examples of the invention.
The reagents and materials used in the present invention are commercially available.
Compared with the prior art, the invention has the beneficial effects that: (1) The prehydrolysis liquid is used as the raw material, the raw material is kept in large quantity, and the raw material cost is low. (2) The method has the advantages of simple process flow, mild reaction, low requirement on equipment, less three-waste generation, small influence on environment, wide application range of products and obvious economic and social benefits. (3) The invention adopts the papermaking waste liquid to extract the feed-grade xylose, the purity requirement is low, the treatment process is less, wherein the process water is mainly used for membrane washing and membrane process purification, only 5-10 tons of water is consumed by 1 ton of finished product, and the wastewater can still return to the system for recycling after being treated by the nanofiltration membrane.
Detailed Description
The invention will be further illustrated with reference to the following examples, although the scope of the invention is not limited thereto.
In the following examples and comparative examples, the used waste papermaking liquid of dissolving pulp was the waste papermaking liquid produced in the pre-hydrolysis section for producing dissolving pulp by the pre-hydrolysis sulfate process. Wherein, the solid content of the dissolving pulp papermaking waste liquid is 5%; the mass percentage of xylose in the solid is 70%.
The xylose content of the material in the following examples was determined by COD method. The COD method is to add concentrated sulfuric acid and a standard solution of potassium dichromate with a certain concentration into a sample to be measured for oxidation treatment for 10-30 min, add water after treatment, and back-titrate with ferrous ammonium sulfate.
Example 1
The method for extracting xylose from the dissolving pulp papermaking waste liquid comprises the following steps:
(1) Standing and precipitating the prehydrolysis liquid for 48 hours, taking supernatant, and marking the supernatant as a material A;
(2) Adding sulfuric acid into the material A to separate out lignin, wherein the pH value of the separating out end point is 1.0, and centrifugally separating out precipitate through 400-mesh filter cloth, and taking filtrate as a material B; the lignin content of the material B is 10.04%, and the xylose content is 75.52%;
(3) Treating the filtrate with ceramic ultrafiltration membrane to obtain concentrated solution and filtrate, and recording the filtrate as material C; the molecular weight cut-off of the ceramic ultrafiltration membrane is 10000, the treatment temperature of the ceramic ultrafiltration membrane is kept at 50 ℃, and the transmembrane pressure is 0.6Mpa; the solid content of the material C is 5.04%, the lignin content in the solid is 5.43%, and the xylose content is 85.34%;
(4) And carrying out negative pressure distillation on the diluted sugar solution at 60 ℃ and under the vacuum degree of 0.1MPa to obtain a xylose product, wherein the solid content of the xylose product is 39.45%, and the xylose content is 86.72%.
Example 2
The method for extracting xylose from the dissolving pulp papermaking waste liquid comprises the following steps:
(1) Standing and precipitating the prehydrolysis liquid for 96 hours, and taking a supernatant as a material A;
(2) Adding sulfuric acid into the material A, and centrifugally separating and precipitating the material A through 400-mesh filter cloth at a final pH of 3.0 to obtain a material B; the lignin content of the material B is 8.04%, and the xylose content is 78.44%;
(3) Treating the filtrate with ceramic ultrafiltration membrane to obtain concentrated solution and filtrate, and recording the filtrate as material C; the molecular weight cut-off of the ceramic ultrafiltration membrane is 10000, the treatment temperature of the ceramic ultrafiltration membrane is kept at 50 ℃, and the transmembrane pressure is 0.6Mpa; the solid content of the material C is 7.43%, the lignin content is 4.42%, and the xylose content is 87.34%;
(4) And carrying out negative pressure distillation on the diluted sugar solution at 80 ℃ and under the vacuum degree of 0.08MPa to obtain a xylose product, wherein the solid content in the xylose product is 39.78%, and the xylose content is 88.85%.
Example 3
The method for extracting xylose from the dissolving pulp papermaking waste liquid comprises the following steps:
(1) Standing and precipitating the prehydrolysis liquid for 96 hours, taking supernatant and marking the supernatant as a material A;
(2) Adding sulfuric acid into the material A, centrifuging and separating the precipitate through 400-mesh filter cloth at the end point pH of 5.0 to obtain filtrate, and marking the filtrate as a material B; the lignin content of the material B is 6.08%, and the xylose content is 80.37%;
(3) Treating the filtrate with ceramic ultrafiltration membrane to obtain concentrated solution and filtrate, and recording the filtrate as material C; the molecular weight cut-off of the ceramic ultrafiltration membrane is 10000, the treatment temperature of the ceramic ultrafiltration membrane is kept at 60 ℃, and the transmembrane pressure is 0.6Mpa; the solid content of the material C is 9.92%, the lignin content is 3.73%, and the xylose content is 90.45%;
(4) And carrying out negative pressure distillation on the diluted sugar solution at 100 ℃ and under the vacuum degree of 0.06MPa to obtain a xylose product, wherein the solid content of the xylose product is 40.32%, and the xylose content is 91.78%.
Comparative example 1
Patent CN106349012.
As can be seen from the above comparative example 1, comparative example 1 requires a large amount of wastewater to be produced by membrane treatment, acidolysis, ion exchange, concentration and decolorization, and the like, and requires 70 to 80 tons of water to be consumed for producing 1 ton of finished product. Compared with comparative example 1, the method for extracting feed-grade xylose by using papermaking waste liquid has low purity requirement and less treatment process, wherein the process water is mainly used for membrane washing and membrane process purification, only 5-10 tons of water is consumed by 1 ton of finished product, and the wastewater can still return to the system for recycling after being treated by the nanofiltration membrane.
The above examples are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above examples, and any other changes, modifications, substitutions, combinations, and simplifications that do not depart from the spirit and principle of the present invention should be made in the equivalent manner, and the embodiments are included in the protection scope of the present invention.
Claims (8)
1. The method for extracting xylose from the dissolving pulp papermaking waste liquid is characterized by comprising the following steps of:
(1) Standing and precipitating the dissolving pulp papermaking waste liquid in a container, and taking a supernatant as a material A;
(2) Adding acid into the material A to separate out lignin, and processing the lignin by a centrifugal machine to obtain filtrate which is recorded as a material B;
(3) Treating the material B by a ceramic ultrafiltration membrane to obtain concentrated solution and filtrate, and marking the filtrate as a material C;
(4) Concentrating the material C to obtain a xylose product.
2. The method for extracting xylose from dissolving pulp paper making waste liquid according to claim 1, wherein in the step (1), the dissolving pulp paper making waste liquid is paper making waste liquid produced in a dissolving pulp pre-hydrolysis section produced by a pre-hydrolysis sulfate method; the standing and precipitating time is at least 48 hours.
3. The method of extracting xylose from a dissolving pulp paper making waste liquor as claimed in claim 1, wherein in said step (2), said acid form is sulfuric acid, and the end point pH of said lignin precipitation is 1-5.
4. The method for extracting xylose from a dissolving pulp papermaking waste liquid as claimed in claim 1, wherein in the step (2), the filter cloth of the centrifuge has a filter cloth pore size of 200-700 mesh.
5. The method for extracting xylose from a dissolving pulp paper making waste liquid as claimed in claim 1, wherein in said step (3), the molecular weight cut-off of said ceramic ultrafiltration membrane is 10000-30000; the temperature of the ultrafiltration membrane treatment is 50-70 ℃; the membrane feeding pressure of the ceramic membrane treatment is 0.5-0.7MPa.
6. The method for extracting xylose from a dissolving pulp paper making waste liquid as claimed in claim 1, wherein in said step (3), the solid content in said material C is 5-10%.
7. The method for extracting xylose from a dissolving pulp paper making waste liquid as claimed in claim 1, wherein in said step (4), said concentration is carried out by distillation under negative pressure, wherein the vacuum degree is 0.06-0.1MPa, and the temperature is 60-100 ℃.
8. The method for extracting xylose from a dissolving pulp paper making waste liquid as claimed in claim 1, wherein in the step (4), the solid content of the obtained xylose product liquid is 35-45%, and the xylose content in the solid is more than 85%.
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| CN202310823052.8A CN116874105A (en) | 2023-07-06 | 2023-07-06 | Method for extracting xylose from dissolving pulp papermaking waste liquid |
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| CN202310823052.8A CN116874105A (en) | 2023-07-06 | 2023-07-06 | Method for extracting xylose from dissolving pulp papermaking waste liquid |
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