Method for efficiently separating three components of lignocellulose biomass by using alcohol-based ternary eutectic solvent

Abstract

The invention relates to a method for efficiently separating three components of lignocellulose biomass by using an alcohol-based ternary eutectic solvent, which comprises the following steps: uniformly mixing choline chloride, 4-chlorobenzenesulfonic acid and an organic alcohol solvent, heating in an oil bath, and stirring to obtain the alcohol-based eutectic solvent; the preparation method comprises the following steps: mixing an alcohol-based eutectic solvent with agriculture and forestry solid waste powder, putting the mixture into a reaction kettle, introducing carbon dioxide gas until the carbon dioxide gas forms subcritical carbon dioxide, and carrying out stepped progressive increase reaction under the reaction pressure of 2-4MPa to obtain an intermediate product; mixing the intermediate product with a reaction stopping agent, and performing suction filtration, cleaning, vacuum drying and grinding to obtain dry cellulose solid residual powder; adding deionized water of which the volume is 10 times that of the filtrate into the filtrate, standing, precipitating and centrifuging to obtain a lignin-enriched component; and adding a 5-30% ethanol solution, continuously stirring, centrifuging and drying to obtain the purified lignin. The lignin removal rate and the cellulose retention rate of the lignocellulose in the agricultural and forestry solid wastes are effectively improved.

Description

Technical Field

[0001] The invention belongs to the technical field of lignocellulose separation, and in particular to a method for efficiently separating three components of lignocellulose biomass by utilizing an alcohol-based ternary low eutectic solvent. Background Art

[0002] In the development of clean energy technology, biomass resources, especially lignocellulosic biomass, play a vital role and are expected to become a substitute for fossil fuel products. The annual production of lignocellulosic biomass in the world is about 1.8×10 11 Tons, these biomass resources mainly include crop straw and forestry waste durian shells, etc. Through efficient utilization and fine processing of these biomass resources, we can develop new chemical and energy products to meet the needs of social development, while reducing dependence on fossil fuels and effectively alleviating the problem of global resource shortage.

[0003] Destroying the complex structure of lignocellulose and achieving effective separation of its components is the key to achieving high-value utilization of lignocellulose. The hydrolysis of cellulose is converted into glucose and further dehydrated to generate various platform compounds. The premise of this process is to obtain high-purity cellulose, which poses a challenge to the innovation of lignocellulose separation technology. At present, the separation of lignocellulose mainly adopts chemical methods, including acid, alkali, organic solvent and ionic liquid pretreatment. Although the traditional organic solvent separation steps are simple, there are problems such as high energy consumption, strong equipment corrosion, serious environmental pollution, high cost and difficult synthesis.

[0004] Therefore, the development of more environmentally friendly and cost-effective lignocellulose separation technologies is of great significance for promoting the sustainable utilization of biomass resources. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a method for efficiently separating three components of lignocellulosic biomass using an alcohol-based ternary low eutectic solvent, so as to improve the lignin removal rate and cellulose retention rate of lignocellulose in agricultural and forestry solid wastes such as straw and durian, and realize the efficient recycling of waste biomass.

[0006] The present invention solves the technical problem by adopting the following technical solutions: A method for efficiently separating three components of lignocellulosic biomass using an alcohol-based ternary deep eutectic solvent comprises the following steps: S1. Evenly mix choline chloride, 4-chlorobenzenesulfonic acid and an organic alcohol solvent, heat in an oil bath, and stir to obtain an alcohol-based deep eutectic solvent; S2. Mixing an alcohol-based low eutectic solvent with agricultural and forestry solid waste powder, placing the mixture in a reactor, introducing carbon dioxide gas until the carbon dioxide gas forms subcritical carbon dioxide, and performing a step-by-step increasing reaction at a reaction pressure of 2-4 MPa to obtain an intermediate product; S3, mixing the intermediate product obtained in step S2 with a reaction terminator, filtering, washing, vacuum drying, and grinding to obtain a dry cellulose solid residual powder; S4, adding 10 times the volume of deionized water to the filtrate, allowing it to settle, and centrifuging to obtain a lignin-enriched component; S5. Add 5-30% ethanol solution to the lignin-enriched fraction, continue stirring, centrifuge, and dry to obtain purified lignin.

[0007] Moreover, in step S1, the molar ratio of choline chloride to 4-chlorobenzenesulfonic acid is 0.5-2:0.7, and the amount of the organic alcohol solvent is twice that of choline chloride.

[0008] Moreover, the organic alcohol solvent is ethanol, methanol or ethylene glycol.

[0009] Moreover, in step S2, the mass ratio of the agricultural and forestry solid waste powder to the alcohol-based low eutectic solvent is 1:7-1:15.

[0010] Moreover, the agricultural and forestry solid waste powder includes durian shells and straw.

[0011] Moreover, in step S2, the stepwise pressurization of carbon dioxide is performed for 5-10 min at 2 MPa and for 20-30 min at 4 MPa.

[0012] Moreover, in step S2, before pressurization, the reactor needs to be gas-replaced, and the steps of gas replacement are: use carbon dioxide to discharge the air in the reactor through the vent valve multiple times, control the air pressure in the reactor to 0 MPa, and then pressurize to the reaction pressure.

[0013] Moreover, the reaction terminator is an acetone solution with a mass fraction of 70%.

[0014] Moreover, the mass ratio of the intermediate product to the reaction terminator is 1:2-10:1.

[0015] Moreover, in step S3, the drying temperature is 40-80°C, and in step S5, the drying temperature is 60-100°C.

[0016] The advantages and positive effects of the present invention are: 1. The present invention uses biomass such as durian shells and straw as raw materials to achieve the recycling of waste biomass; the present invention can be applied to a variety of subcritical fluids, and carbon dioxide is selected as the fluid medium of the present invention. By performing a one-step separation of lignocellulose in biomass exempted from chemical treatment under a maximum pressure of 4MPa, the covalent bond between carbohydrates and lignin is broken, and then lignin and hemicellulose are separated from cellulose, and then lignin is precipitated by adding an ethanol solution.

[0017] 2. The organic alcohol solvent and 4-chlorobenzenesulfonic acid in the present invention have strong hydrogen bond and covalent bond scavenging capabilities, which can promote lignin separation and cellulose depolymerization. The subcritical carbon dioxide atmosphere in the separation process helps the reaction components to mix fully and promotes mass transfer. The carbon dioxide dissolved in the reaction solution under pressure conditions will further reduce the pH value of the solution and create an acidic reaction environment.

[0018] 3. The pressurized carbon dioxide fluid provided by the present invention helps to reduce the viscosity of the reaction system with the assistance of continuous stirring, thereby increasing the separation efficiency. The dissolved carbon dioxide can protect the chemical structure and properties of the lignin product by combining with the functional groups outside the separated lignin molecules. The results of the embodiment show that the cellulose-enriched solid residue obtained by the separation method provided by the present invention has a cellulose retention rate of 84.7% and a lignin removal rate of 91.5%.

[0019] 4. The subcritical fluid used in the present invention has been proven to be an excellent reaction medium in the field of separation and extraction. Its low viscosity physical property enables it to significantly improve the reaction rate of high-viscosity reaction systems. Carbon dioxide, as a fluid substance in this invention, dissolves to increase the acidity of the solution, which helps certain reactions that rely on an acidic environment. Carbon dioxide is easy to separate by itself after the reaction is completed, and is more environmentally friendly than other chemical auxiliary means.

[0020] 5. The subcritical gas introduced into the present invention is carbon dioxide gas, and the pressure increases stepwise from 0 to 4 MPa. The reaction is 1 to 10 minutes at 2 MPa, which can effectively reduce the pH of the solution, create a moderately acidic environment, accelerate the depolymerization of lignocellulose, and reduce the viscosity of the solvent, improve its fluidity, and make the solvent contact with the raw material more fully; the reaction is 20-30 minutes at 4 MPa, and the dissolved carbon dioxide combines with the functional groups outside the separated lignin molecules, just like putting a "protective coat" on the lignin, stabilizing its chemical structure, preventing excessive degradation, and ensuring that the separated lignin is of good quality. 6. The cellulose-enriched solid residue and lignin separated by the preparation method of the present invention are purified by alcohol washing; the subcritical fluid atmosphere in the separation reaction process helps the reaction components to mix fully and promote mass transfer. Carbon dioxide, as a subcritical gas, dissolves in the reaction solution under pressure conditions, which will further reduce the pH value of the solution and create an acidic reaction environment. In addition, the pressurized carbon dioxide fluid helps to reduce the viscosity of the reaction system with the assistance of continuous stirring, thereby increasing the separation efficiency. The dissolved carbon dioxide can protect the chemical structure and properties of the lignin product by combining with the outer functional groups of the separated lignin molecules. The reaction temperature is controlled below 100°C, thus achieving a green and efficient separation reaction. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is the infrared spectrum of the present invention.

[0022] Figure 2 This is a scanning electron microscope image of the cellulose-enriched solid residue separated by the present invention.

[0023] Figure 3 This is a thermogravimetric curve of the lignin separated and purified by the present invention.

[0024] Figure 4 This is the 2D-hsqc NMR graph of the lignin separated and purified by the present invention.

[0025] Figure 5 This is a data graph showing the change in lignin removal rate and cellulose retention rate with pressure in Example 1. DETAILED DESCRIPTION

[0026] The present invention is further described in detail below through specific examples. The following examples are only illustrative and not restrictive, and the protection scope of the present invention cannot be limited thereto.

[0027] See also Figure 1-Figure 5 As shown, Figure 1 It is the infrared spectrum of the present invention. Figure 1 It can be seen that 2917cm representing the CH bond and -OH bond respectively -1 and 3421cm-1 The peak area near 1637cm was significantly reduced, indicating that the intramolecular and intermolecular hydrogen bonds of biomass have been destroyed by DES. -1 The decrease in the peak signal of 1062cm represents the removal of hemicellulose because it represents the stretching vibration of the acetyl groups in hemicellulose. -1 The signals of 1470 μg / mL were from syringin and guaiac lignin, and the significant decrease in the signals indicated that lignin was largely removed during the DES treatment.

[0028] Figure 2 The following is a scanning electron microscope image of the cellulose-enriched solid residue separated by the present invention. Figure 2 It can be seen that the surface of the material particles after DES treatment has a rugged and obviously eroded morphology, and the specific surface area is increased.

[0029] Figure 3 The thermogravimetric curve of the lignin separated and purified by the present invention is shown in FIG. Figure 3 It can be seen that the separated and purified lignin has good stability.

[0030] Figure 4 The 2D-hsqc NMR diagram of the lignin separated and purified by the present invention. Figure 4 It can be seen that the methoxy units (-OCH3) indicate that there are a large number of S or G lignin units in the sample.

[0031] Figure 5 The data diagram of the lignin removal rate and cellulose retention rate of the present invention as a function of pressure is shown in FIG. The red curve in the figure represents the cellulose retention rate, and the black curve represents the lignin removal rate.

[0032] A method for efficiently separating three components of lignocellulosic biomass using an alcohol-based ternary deep eutectic solvent comprises the following steps: S1. Evenly mix choline chloride, 4-chlorobenzenesulfonic acid and an organic alcohol solvent, heat in an oil bath, and stir to obtain an alcohol-based deep eutectic solvent; S2. Mixing an alcohol-based low eutectic solvent with agricultural and forestry solid waste powder, placing the mixture in a reactor, introducing carbon dioxide gas until the carbon dioxide gas forms subcritical carbon dioxide, and performing a step-by-step increasing reaction at a reaction pressure of 2-4 MPa to obtain an intermediate product; S3, mixing the intermediate product obtained in step S2 with a reaction terminator, filtering, washing, vacuum drying, and grinding to obtain a dry cellulose solid residual powder; S4, adding 10 times the volume of deionized water to the filtrate, allowing it to settle, and centrifuging to obtain a lignin-enriched component; S5. Add 5-30% ethanol solution to the lignin-enriched fraction, continue stirring, centrifuge, and dry to obtain purified lignin.

[0033] The present invention utilizes an alcohol-based ternary low eutectic solvent to separate biomass to obtain cellulose-enriched solid residues and lignin. The biomass is lignocellulose agricultural and forestry wastes such as straw and durian shells.

[0034] The ternary deep eutectic solvent is prepared by mixing choline chloride and 4-chlorobenzenesulfonic acid as protons with an auxiliary solvent organic alcohol with optimized viscosity. The present invention uses choline chloride and 4-chlorobenzenesulfonic acid as hydrogen bond donors and hydrogen bond acceptors of the deep eutectic solvent, and combines subcritical carbon dioxide to depolymerize the main component of biomass, lignocellulose, without destroying the chemical structure and properties of the final product. There is no special limitation on the sources of the choline chloride, 4-chlorobenzenesulfonic acid and auxiliary solvent alcohol solvent, and commercial products well known to those skilled in the art can be used.

[0035] The molar ratio of choline chloride to 4-chlorobenzenesulfonic acid is 1:0.7, and the amount of the alcohol solvent added is fixed to 2 times that of choline chloride. The mass ratio of biomass to the low eutectic solvent is 1g:10g. It is preferred to control the mass ratio of biomass to the low eutectic solvent to the above specific ratio, so as to ensure that the lignocellulose is fully separated without wasting raw materials.

[0036] The mixing process of the lignocellulosic biomass and the low eutectic solvent should avoid the sample sticking to the inner wall of the reactor to cause incomplete reaction. After the separation reaction is completed, the reaction product is sequentially subjected to reaction termination, suction filtration and vacuum drying to obtain a cellulose-enriched solid residue. By breaking the connecting bond between lignin and cellulose, the separation of different components of lignocellulose is promoted.

[0037] The pressure of the subcritical reaction environment is preferably 0-4MPa, increasing in steps, and the reaction time is 1-10min at 2MPa and 20-30min at 4MPa. The reaction temperature is preferably 60-90°C, more preferably 80-90°C, and most preferably 90°C; the addition amount of the chemically treated biomass and the low eutectic solvent is preferably 1g:10g; the concentration of the reaction stop solution acetone aqueous solution is preferably 70%, and the reaction is preferably carried out in a 50mL reactor liner.

[0038] There is no special requirement for the equipment in the reaction process, and a heating and stirring device for a reaction kettle well known to those skilled in the art can be used. In a specific embodiment of the present invention, the heating and stirring device is preferably provided by Haian Petroleum Research Instrument Co., Ltd.

[0039] The vacuum drying temperature of the cellulose residue is preferably 60° C. and the vacuum drying time is preferably 12 hours. The temperature of the heat treatment is preferably controlled at the above time point. If the drying temperature is too low, the cellulose residue cannot be completely dried, and if the temperature is too high, energy is wasted.

[0040] The drying temperature of lignin is preferably 80°C; the drying time is preferably 24 hours. The temperature and time of the lignin drying treatment are preferably controlled within the above ranges to ensure complete drying of the lignin sample.

[0041] The concentration of the ethanol aqueous solution used in the alcohol washing treatment is preferably 10%; the alcohol washing treatment time is preferably 12 hours; and the magnetic stirring speed during the alcohol washing treatment is preferably 300 rpm.

[0042] The filtration is preferably vacuum filtration.

[0043] The water used for filtration, ethanol and acetone aqueous solution is preferably ultrapure water; the amount of filtration solvent used is preferably 40-100 mL, more preferably 50-75 mL; the number of times the filtration solvent is added is preferably 3-5 times. The filtration process is preferably: the product after the separation reaction treatment is mixed with the reaction terminator and then vacuum filtered. In the present invention, the amount of reaction terminator added is preferably 10-15 mL.

[0044] The centrifuge speed is preferably 11000 rpm, the centrifugation time is preferably 3 min, and the specific specification of the centrifuge tube used in the centrifugation step is preferably a 50 mL centrifuge tube.

[0045] The present invention mixes ethanol and water to obtain a 10% ethanol washing solution. There is no particular limitation on the operation of mixing ethanol and water, and a liquid-liquid mixing technical solution well known to those skilled in the art can be used.

[0046] In the present invention, ethanol is preferably 99.8% ethanol. Ethanol is only used as a detergent and does not dissolve lignin. There is no particular limitation on the source of ethanol, and commercial products known to those skilled in the art can be used.

[0047] In the present invention, the drying temperature of the lignin component after centrifugation is preferably 80°C; the drying time is preferably 18-28h, more preferably 22-24h. In the present invention, the temperature and time of lignin drying are preferably controlled within the above range, which is conducive to promoting the complete dehydration of the lignin component. In the present invention, the equipment used for the lignin drying reaction is preferably a constant temperature oven.

[0048] Example 1 A method for efficiently separating three components of lignocellulosic biomass using an alcohol-based ternary deep eutectic solvent comprises the following steps: S1. Mix choline chloride and 4-chlorobenzenesulfonic acid in a molar ratio of 1:0.7, add an ethanol solvent whose amount is twice that of choline chloride, heat to 60° C. in an oil bath and continue stirring for 2 h to obtain an ethanol low eutectic solvent; S2, 10 g of ethanol low eutectic solvent and 1 g of straw powder were mixed, transferred to a 50 mL reactor liner, a 10 mm long magnet was added, carbon dioxide was filled into the reactor, pressurized to 2 MPa, maintained for 10 min, and then pressurized to 4 MPa, maintained for 20 min, to obtain an intermediate product; S3, mixing the intermediate product obtained in step S2 with 10 mL of 70% acetone, filtering, washing with an acetone aqueous solution until all the low eutectic solvent is separated from the cellulose solid residue, drying under vacuum at 60° C. for 12 h and grinding to obtain a dry cellulose solid residue powder; S4, adding 10 times the volume of deionized water to the filtrate, allowing it to settle and then centrifuging the precipitate to obtain a lignin-enriched component; S5. Add 10% ethanol solution to the lignin-enriched component and continue stirring for 12 hours to remove the residual low eutectic solvent. After stirring, centrifuge the component and dry the precipitate at 80°C to obtain purified lignin.

[0049] The carbohydrate content of the biomass raw materials and the cellulose-enriched solid residue after DES treatment was tested and calculated using the NREL / TP-510-42618 method. The delignification rate of the cellulose-enriched solid residue separated in this embodiment reached 91.05%, the cellulose retention rate reached 65.83%, and the hemicellulose removal rate was 75.48%.

[0050] Example 2 A method for efficiently separating three components of lignocellulosic biomass using an alcohol-based ternary deep eutectic solvent comprises the following steps: S1. Mix choline chloride and 4-chlorobenzenesulfonic acid in a molar ratio of 1:0.7, add an ethanol solvent whose amount is twice that of choline chloride, heat to 60° C. in an oil bath and continue stirring for 2 h to obtain an ethanol low eutectic solvent; S2, 10 g of ethanol low eutectic solvent and 1 g of straw powder were mixed, and the mixture was transferred to a 50 mL reactor liner, a 10 mm long magnetic rod was added, and carbon dioxide was filled into the reactor, and the pressure was increased to 2 MPa, and the pressure was maintained for 30 min to obtain an intermediate product; S3, mixing the intermediate product obtained in step S2 with 10 mL of 70% acetone, filtering, washing with an acetone aqueous solution until all the low eutectic solvent is separated from the cellulose solid residue, drying under vacuum at 60° C. for 12 h and grinding to obtain a dry cellulose solid residue powder; S4, adding 10 times the volume of deionized water to the filtrate, allowing it to settle and then centrifuging the precipitate to obtain a lignin-enriched component; S5. Add 10% ethanol solution to the lignin-enriched component and continue stirring for 12 hours to remove the residual low eutectic solvent. After stirring, centrifuge the component and dry the precipitate at 80°C to obtain purified lignin.

[0051] The carbohydrate content of the biomass raw materials and the cellulose-enriched solid residue after DES treatment was tested and calculated using the NREL / TP-510-42618 method. The delignification rate of the cellulose-enriched solid residue separated in this embodiment reached 90.83%, the cellulose retention rate reached 68.67%, and the hemicellulose removal rate was 74.11%.

[0052] Example 3 A method for efficiently separating three components of lignocellulosic biomass using an alcohol-based ternary deep eutectic solvent comprises the following steps: S1. Mix choline chloride and 4-chlorobenzenesulfonic acid in a molar ratio of 1:0.7, add an ethanol solvent whose amount is twice that of choline chloride, heat to 60° C. in an oil bath and continue stirring for 2 h to obtain an ethanol low eutectic solvent; S2, 10 g of ethanol low eutectic solvent and 1 g of straw powder were mixed, and the mixture was transferred to a 50 mL reactor liner, a 10 mm long magnetic rod was added, and carbon dioxide was filled into the reactor, and the pressure was increased to 4 MPa, and the pressure was maintained for 30 min to obtain an intermediate product; S3, mixing the intermediate product obtained in step S2 with 10 mL of 70% acetone, filtering, washing with an acetone aqueous solution until all the low eutectic solvent is separated from the cellulose solid residue, drying under vacuum at 60° C. for 12 h and grinding to obtain a dry cellulose solid residue powder; S4, adding 10 times the volume of deionized water to the filtrate, allowing it to settle and then centrifuging the precipitate to obtain a lignin-enriched component; S5. Add 10% ethanol solution to the lignin-enriched component and continue stirring for 12 hours to remove the residual low eutectic solvent. After stirring, centrifuge the component and dry the precipitate at 80°C to obtain purified lignin.

[0053] The carbohydrate content of the biomass raw materials and the cellulose-enriched solid residue after DES treatment was tested and calculated using the NREL / TP-510-42618 method. The delignification rate of the cellulose-enriched solid residue separated in this embodiment reached 91.52%, the cellulose retention rate reached 64.77%, and the hemicellulose removal rate was 75.93%.

[0054] Although the embodiments of the present invention are disclosed for illustrative purposes, those skilled in the art will appreciate that various substitutions, changes and modifications are possible without departing from the spirit and scope of the present invention and the appended claims. Therefore, the scope of the present invention is not limited to the contents disclosed in the embodiments.

Claims

1. A method for efficiently separating three components of lignocellulosic biomass using an alcohol-based ternary deep eutectic solvent, characterized in that: The steps include: S1. Evenly mix choline chloride, 4-chlorobenzenesulfonic acid and an organic alcohol solvent, heat in an oil bath, and stir to obtain an alcohol-based deep eutectic solvent; S2. Mixing an alcohol-based low eutectic solvent with agricultural and forestry solid waste powder, placing the mixture in a reactor, introducing carbon dioxide gas until the carbon dioxide gas forms subcritical carbon dioxide, and performing a step-by-step increasing reaction at a reaction pressure of 2-4 MPa to obtain an intermediate product; S3, mixing the intermediate product obtained in step S2 with a reaction terminator, filtering, washing, vacuum drying, and grinding to obtain a dry cellulose solid residual powder; S4, adding 10 times the volume of deionized water to the filtrate, allowing it to settle, and centrifuging to obtain a lignin-enriched component; S5. Add 5-30% ethanol solution to the lignin-enriched fraction, continue stirring, centrifuge, and dry to obtain purified lignin.

2. The method for efficiently separating three components of lignocellulosic biomass using an alcohol-based ternary deep eutectic solvent according to claim 1, characterized in that: In step S1, the molar ratio of choline chloride to 4-chlorobenzenesulfonic acid is 0.5-2:0.7, and the amount of the organic alcohol solvent is twice that of choline chloride.

3. The method for efficiently separating three components of lignocellulosic biomass using an alcohol-based ternary deep eutectic solvent according to claim 2, characterized in that: The organic alcohol solvent is ethanol, methanol or ethylene glycol.

4. The method for efficiently separating three components of lignocellulosic biomass using an alcohol-based ternary deep eutectic solvent according to claim 1, characterized in that: In step S2, the mass ratio of the agricultural and forestry solid waste powder to the alcohol-based low eutectic solvent is 1:7-1:

15.

5. The method for efficiently separating three components of lignocellulosic biomass using an alcohol-based ternary deep eutectic solvent according to claim 4, characterized in that: Agricultural and forestry solid waste powder includes durian shells and straw.

6. The method for efficiently separating three components of lignocellulosic biomass using an alcohol-based ternary deep eutectic solvent according to claim 1, characterized in that: In step S2, the stepwise pressurization of carbon dioxide is performed for 5-10 min at 2 MPa and for 20-30 min at 4 MPa.

7. The method for efficiently separating three components of lignocellulosic biomass using an alcohol-based ternary deep eutectic solvent according to claim 6, characterized in that: In step S2, before pressurization, the reactor needs to be gas-replaced, and the steps of gas replacement are: use carbon dioxide to discharge the air in the reactor through the vent valve multiple times, control the air pressure in the reactor to 0 MPa, and then pressurize to the reaction pressure.

8. The method for efficiently separating three components of lignocellulosic biomass using an alcohol-based ternary deep eutectic solvent according to claim 1, characterized in that: The reaction terminator is an acetone solution with a mass fraction of 70%.

9. The method for efficiently separating three components of lignocellulosic biomass using an alcohol-based ternary deep eutectic solvent according to claim 8, characterized in that: The mass ratio of the intermediate product to the reaction terminator is 1:2-10:

1.

10. The method for efficiently separating three components of lignocellulosic biomass using an alcohol-based ternary deep eutectic solvent according to claim 1, characterized in that: In step S3, the drying temperature is 40-80°C, and in step S5, the drying temperature is 60-100°C.

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