A co-production method based on high-value utilization of whole components of bamboo cane

Abstract

The application is a kind of co-production method based on high-value utilization of whole component of bamboo cane, comprising the following steps: S1, raw material customization supply and pretreatment; S2, flavone extraction and superfine powder preparation; S3, hemicellulose separation and high-carbon powder preparation; S4, multi-path product preparation: path A, material preparation; path B, fuel and chemical preparation; S5, system energy and material circulation. Through the above method, high-purity flavone, bamboo cane superfine residue dry powder, bamboo cane superfine fiber wood dry powder, xylose / syrup, biological resin PLA, bamboo particle raw material, high-purity CO2, dimethyl ether DME, light olefin, benzene, toluene, xylene, green methanol and green aviation kerosene and other products are manufactured. The application realizes the classification and high-value conversion of whole component of bamboo cane, solves the problems of high pretreatment cost and low gasification efficiency, and forms a green circular industrial chain of resources-product-energy.

Description

Technical Field

[0001] This invention relates to the field of high-value comprehensive utilization technology of biomass resources, and in particular to a co-production method based on the high-value utilization of all components of Phragmites australis. Background Technology

[0003] As a high-yielding and stress-resistant perennial herb, *Arundo donax* (Prunus armeniaca) boasts high biomass yield and strong carbon sequestration capacity, making it a promising non-food biomass resource. Currently, research and industrialization efforts regarding the utilization of *Arundo donax* mainly focus on single or limited pathways:

[0004] Direct energy utilization: Simply crushing reeds and burning them directly as solid fuel or gasifying them for power generation. This method has low added value, and the gasification process easily produces a large amount of tar due to the complex composition of the raw materials (rich in hemicellulose, protein, etc.), leading to equipment blockage, catalyst deactivation, poor syngas quality, and high subsequent purification costs.

[0005] Single-component extraction: For example, extracting flavonoids from Reed hyacinth as a raw material for health products. While this method can yield high-value products, the residue after extraction (which accounts for the majority of the raw material) is usually discarded or used as low-value fuel, failing to achieve full utilization of the raw material, limiting overall economic efficiency, and potentially causing environmental pressure due to residue disposal.

[0006] The traditional biomass-to-methanol route typically involves directly drying, pulverizing, and gasifying Reed (Phyllostachys amurensis) to synthesize methanol. This route suffers from significant bottlenecks: high pretreatment energy consumption (drying and pulverizing Reed with high moisture content to a fineness suitable for efficient gasification incurs substantial energy costs); low gasification efficiency and poor syngas quality (components such as hemicellulose in the feedstock easily generate tar during gasification, and the hydrogen-to-carbon ratio (H2 / CO) of the syngas often deviates from the optimal ratio for methanol synthesis (approximately 2:1), requiring complex adjustments); insufficient carbon atom utilization (carbon is often lost as CO2 during the process, contradicting low-carbon goals); and limited product variety and weak market risk tolerance.

[0007] In summary, existing technologies either fail to achieve high-value, full-scale utilization of Reed amaranth resources, resulting in low economic and environmental benefits; or, when used for the production of green energy and chemicals (such as green methanol and green jet fuel), they are constrained by high pretreatment costs, inefficient conversion processes, and a single output model, hindering their large-scale and commercial development. Therefore, there is an urgent need for an integrated and innovative method that can systematically solve these problems and achieve refined, tiered, and high-value utilization of all components of Reed amaranth. Summary of the Invention

[0008] The present invention aims to address the shortcomings of the prior art by providing a co-production method based on the high-value utilization of all components of Phragmites australis.

[0009] To achieve the above objectives, the present invention adopts the following technical solution: a co-production method based on the high-value utilization of all components of Reed hyacinth, comprising the following steps:

[0010] S1. Customized raw material supply and pretreatment: Providing raw materials of Reed sedge produced through specific agronomic processes, and cleaning, dehydrating, drying and pre-crushing them to obtain Reed sedge fragments whose properties and specifications meet the requirements of subsequent deep processing;

[0011] S2. Flavonoid Extraction and Ultrafine Powder Preparation: The reed fragments were compound-pulverized to an ultrafine powder of 80-100 mesh at a temperature below 40℃ in the presence of wine, and flavonoids were extracted in the wine simultaneously. After solid-liquid separation, the liquid phase was purified and separated by multi-stage membrane group and freeze-dried to obtain high-purity flavonoid powder. The small solid particles were distilled and dried to obtain ultrafine dry powder of reed residue, and the large solid particles were returned to compound-pulverization for further flavonoid extraction.

[0012] S3. Hemicellulose separation and high-carbon powder preparation: The ultrafine dry powder of Reed Bamboo residue is sequentially activated by steam explosion and treated with dilute alkali solution, followed by solid-liquid separation. The separated liquid phase is purified by multi-stage membrane group to obtain xylose or syrup, and the separated solid phase is dried to obtain Reed Bamboo ultrafine fiber wood dry powder.

[0013] S4. Multi-path product preparation:

[0014] Path A, Material Preparation: Polylactic acid bioresin is prepared by bio-fermentation and chemical reaction of xylose or syrup; bamboo ultrafine fiber wood dry powder is compounded with polylactic acid bioresin to prepare bamboo-based plastic raw material granules.

[0015] Route B, Fuel and Chemical Preparation: Gasification of Reed microfiber wood powder yields crude syngas; after purification, hydrogen generated from water electrolysis using renewable energy is added to adjust the hydrogen-carbon molar ratio in the syngas to 2:1, followed by catalytic synthesis and distillation to obtain green methanol; a portion of the green methanol is then subjected to dehydration to produce dimethyl ether, olefin synthesis, aromatization, fractional distillation purification, and product blending to obtain benzene, toluene, xylene, and green aviation kerosene.

[0016] S5. System Energy and Material Circulation: The waste heat generated during the synthesis of green methanol and gasification process in Path B is recovered. The generated steam is used for power generation and as a heat source for gasification agent, raw material drying, steam explosion and solvent recovery. High-purity carbon dioxide is produced as a by-product during the synthesis gas purification process.

[0017] Specifically, in step S1, the specific agronomic process includes: screening for multi-carbon genes and polyploid breeding of Reed hyacinth, followed by tissue culture and hardening of seedlings, and then standardized mechanical transplanting at a standard of 1020 plants per mu (approximately 667 square meters) with 2-meter-wide ridges and three rows of spaced seedlings. Mechanized crushing and harvesting are carried out between November and February of the following year to obtain Reed hyacinth segments with stem lengths of 2-5 cm.

[0018] Specifically, in step S1, the pretreatment includes: cleaning, dehydrating and drying the harvested reed segments at the primary processing base, controlling their moisture content and ash content to not exceed 10%; storing the treated reed segments in a moisture-proof, insect-proof, mildew-proof and ash-proof raw material silo; sending the reed segments in the silo to the raw material pre-crushing process via an automatic conveying device, where they are sequentially subjected to low-temperature mechanical pre-crushing at below 40°C to 1-2 cm, moisture content is tested and dried to control, and then cleaned with alcohol and tested for ash content to obtain clean reed fragments.

[0019] Specifically, in step S2, the liquor is 68 degrees; the compound pulverization is a combination of liquid pulverizer and steel pulverizer, and the ultrafine pulverization and extraction process is accompanied by ultrasonic treatment with a frequency of 20-40KHz and a power of 300-700W; the liquor is recovered simultaneously during the liquid and solid phase treatment.

[0020] Specifically, in step S4 path A, the preparation of polylactic acid bioresin from syrup through biological fermentation and chemical reaction is as follows: after the syrup is detoxified, decolorized and its concentration adjusted in sequence, it is fermented with special mixed bacteria to obtain lactic acid, and then the lactic acid is subjected to chemical reactions including esterification, dehydration polycondensation, depolylactide removal and ring-opening polymerization to obtain high molecular weight polylactic acid bioresin.

[0021] Specifically, in step S4 path A, the preparation of bamboo-based plastic raw material particles is as follows: the dry powder of Phyllostachys edulis ultrafine fiber wood is melt-blended with high molecular weight polylactic acid bioresin at a weight ratio of 4:6, and then extruded and granulated.

[0022] Specifically, in step S4 path B, gasification is carried out at 850-950°C, and the gasifying agent contains oxygen and water vapor; the oxygen and hydrogen are derived from water electrolysis using renewable energy power, and the renewable energy power is one or more of wind power, photovoltaic power, or biomass power.

[0023] Specifically, in step S4 path B, the crude syngas purification includes: first, removing ash through a cyclone separator, then washing away residual tar and fine dust with water or solvent in a scrubbing tower or removing tar using an electrostatic precipitator, then using low-temperature methanol for acid gas removal and methane reforming to purify CO and H2, while simultaneously capturing high-purity CO2, which is then injected into a high-purity CO2 storage tank for adjusting the carbon content of the syngas.

[0024] Specifically, in step S4, path B, the preparation of green methanol is as follows: pure syngas is used in an isothermal shell-and-tube reactor, where a Cu-ZnO-Al2O3 catalyst is used inside the tube, and the reaction temperature is 220-280℃, and the pressure is 5.0-10.0 MPa to generate crude methanol. Boiling water is used to remove the heat of reaction and cool the crude methanol in the shell side of the reactor. The heat of reaction is cooled with water to obtain hot water and hot steam. The hot water and hot steam are sent to the waste heat boiler of the waste heat power generation process to be gasified into superheated steam. Part of the superheated steam is used as steam for gasification, and the other part is used to drive the steam turbine generator set to generate electricity. After the steam is cooled after power generation, it is returned to the waste heat boiler for recycling. The crude methanol is purified by a three-tower distillation system to remove light and heavy components to obtain fuel-grade green methanol products. It can also be cooled to obtain low-temperature methanol.

[0025] Specifically, in step S4, path B, the process of producing benzene, toluene, xylene, and green aviation kerosene from green methanol is as follows: methanol is dehydrated to produce dimethyl ether; dimethyl ether is reacted to produce light olefins; the light olefins are aromatized under the action of an aromatization catalyst to produce an aromatic mixture; the aromatic mixture is purified by fractional distillation to obtain benzene, toluene, and xylene; the light olefins are blended with the separated benzene, toluene, and xylene in a certain proportion to obtain green aviation kerosene.

[0026] The beneficial effects of this invention are:

[0027] This invention precisely couples "physical extraction (flavonoids) - biotransformation (PLA) - chemical synthesis (fuels and chemicals)" to convert the main components of Reed hyacinth, such as flavonoids, hemicellulose, cellulose and lignin, into high-purity pharmaceutical raw materials, biodegradable bioresins, green fuels and chemicals, respectively. This allows nearly 100% of the components of Reed hyacinth to be converted into products with high market value, completely getting rid of the predicament of waste or low-value incineration in the traditional utilization mode, and maximizing resource utilization efficiency and economic value.

[0028] This invention does not simply bear the high costs of ultrafine powdering and drying. Instead, it integrates a "low-temperature ultrafine powdering of wine liquid - simultaneous flavonoid extraction" process, transforming the originally energy-intensive pretreatment step into the main process for producing high-value flavonoid products. This allows the pretreatment costs to be effectively absorbed and covered by the high-value products. The subsequent steam explosion separation of hemicellulose further absorbs its costs through the production of high-value PLA bioresin. This integrated design, which "drives and covers process costs with product revenue," fundamentally breaks through the economic bottleneck of biomass refining pretreatment.

[0029] This invention removes flavonoids, proteins, and hemicellulose—components prone to coking and producing tar—through preliminary steps, resulting in "Phyllostachys amurensis ultrafine fiber wood powder," a high-quality gasification feedstock with significantly increased carbon content (approximately 20%) and purer components. This leads to extremely low tar generation, high-quality syngas, and a hydrogen-to-carbon ratio closer to the ideal value during subsequent gasification processes. It also significantly reduces the difficulty and cost of gas purification, shortens gasification time, and improves carbon conversion rate and the energy efficiency and yield of the target product (green methanol).

[0030] This invention efficiently recovers the waste heat generated during methanol synthesis and gasification through a waste heat boiler and power generation system. The resulting electricity and steam are supplied in a closed loop to upstream processes such as raw material drying, steam explosion, gasification agent treatment, and solvent recovery, significantly reducing the need for externally purchased energy. Simultaneously, the high-purity CO2 produced as a byproduct of syngas purification can be reused to adjust the syngas ratio or sold as a product, achieving carbon capture and utilization. The entire system forms a green circular model of "tiered energy utilization and full material utilization," with significantly lower energy consumption and carbon emissions than discrete processes.

[0031] This invention can simultaneously produce more than ten products across four major sectors: pharmaceuticals and healthcare, environmental materials, clean energy, and basic chemicals. Enterprises can flexibly adjust the production ratio of "green methanol" and "green jet fuel and chemicals" based on market demand and price fluctuations, or decide whether to sell intermediate products (such as xylose syrup and fiber powder) directly. This flexible production model, with its multiple production and export capabilities, greatly enhances the resilience of the industrial chain and the stability of economic benefits. Attached Figure Description

[0032] Figure 1 This is the overall flowchart of the present invention;

[0033] Figure 2 This is a flowchart of step S1 of the present invention;

[0034] Figure 3 This is a flowchart of step S2 of the present invention;

[0035] Figure 4 This is a flowchart of step S3 of the present invention;

[0036] Figure 5 This is a flowchart of step S4 of the present invention;

[0037] The following will describe in detail, with reference to the accompanying drawings, embodiments of the present invention. Detailed Implementation

[0038] The present invention will be further described below with reference to embodiments:

[0039] like Figures 1-5 As shown, a co-production method based on the high-value utilization of all components of Reed sphagnum moss includes the following steps:

[0040] S1. Customized raw material supply and pretreatment: Providing raw materials of Reed sphagnum moss produced through specific agronomic processes, and cleaning, dehydrating, drying and pre-crushing them to obtain Reed sphagnum moss fragments whose properties and specifications meet the requirements of subsequent deep processing.

[0041] The specific agronomic process includes: screening for multi-carbon genes and polyploid breeding of Reed hyacinth, followed by tissue culture and hardening of seedlings, and then standardized mechanical transplanting with 2-meter-wide ridges, three rows with gaps, and 1020 plants per mu. Mechanized crushing and harvesting are carried out between November and February of the following year to obtain Reed hyacinth segments with stem lengths of 2-5 cm.

[0042] Pre-treatment includes: cleaning, dehydrating and drying the harvested reed segments at the primary processing base, controlling their moisture content and ash content to not exceed 10%; storing the treated reed segments in a moisture-proof, insect-proof, mildew-proof and ash-proof raw material silo; sending the reed segments in the silo to the raw material pre-crushing process through an automatic conveying device, where they are mechanically pre-crushed to 1-2 cm at a low temperature below 40℃, tested and dried to control the moisture content, and then cleaned with alcohol and tested for ash content to obtain clean reed fragments.

[0043] S2. Flavonoid Extraction and Ultrafine Powder Preparation: The reed fragments were compound-pulverized to an ultrafine powder of 80-100 mesh at a temperature below 40℃ in the presence of wine, and flavonoids were extracted in the wine simultaneously. After solid-liquid separation, the liquid phase was purified and separated by multi-stage membrane array and freeze-dried to obtain high-purity flavonoid powder. The small solid particles were distilled and dried to obtain ultrafine dry powder of reed residue, and the large solid particles were returned to compound-pulverization for further flavonoid extraction.

[0044] The liquor is 68 degrees; the compound pulverization is carried out by a combination of liquid pulverizer and steel pulverizer, and the ultrafine pulverization and extraction process is accompanied by ultrasonic treatment with a frequency of 20-40KHz and a power of 300-700W; the liquor is recovered simultaneously during the liquid and solid phase treatment.

[0045] Specifically, the process begins with initial separation using a millimeter-level horizontal spiral separator, where large particles are further pulverized and extracted to extract flavonoids. Smaller particles and the flavonoid-containing solution then enter a multi-stage membrane separation and purification process. First, the flavonoid-containing wine solution is passed through an ultrafiltration membrane to remove large molecular impurities. A large amount of large-molecule reed powder residue is then sent to a reed powder residue distillation dryer for distillation and recovery of the wine. The dried solid is the ultrafine reed residue powder, which is stored in an ultrafine reed powder silo for hemicellulose separation, or can be directly sold to markets such as feed additives, fuel pellet processing, coal-to-fuel conversion in power plants, and biomass power plant fuel. After ultrafiltration, the flavonoid-containing wine solution undergoes nanofiltration to remove small molecular impurities, followed by nanofiltration dialysis to further remove these impurities. The flavonoid-containing concentrate, after removing small molecular impurities, is freeze-dried and crystallized to obtain high-purity flavonoid powder products, which can be sold to pharmaceutical, health product, and functional food markets. The wine containing small molecular impurities is then recovered through distillation and used as a solvent for blending extraction wines. During distillation, the small molecular impurities are decomposed or carbonized.

[0046] S3. Hemicellulose separation and high-carbon powder preparation: The ultrafine dry powder of reed residue is sequentially activated by steam explosion and treated with dilute alkali solution, followed by solid-liquid separation. The separated liquid phase (syrup containing xylose, xylooligosaccharides and furfural) is purified by multi-stage membrane purification to obtain xylose or syrup. The separated solid phase is dried to obtain reed ultrafine fiber wood dry powder.

[0047] Specifically, a horizontal screw separator is used for millimeter-level solid-liquid separation. The sugar solution is sequentially subjected to microfiltration / ultrafiltration, nanofiltration to separate oligosaccharides, nanofiltration to desalinate monosaccharides, and ultrafiltration chromatography for feed protection to obtain xylose / syrup products. The solid phases separated in each step are dried to obtain Reed Bamboo ultrafine fiber wood powder.

[0048] Extracting flavonoids from 68-degree alcohol requires cleaning and grinding Reed Bamboo into powder of 80 to 100 mesh. Because the entire extraction process is conducted at a low temperature below 40℃, the powder after flavonoid extraction still retains approximately 98% of the main components of Reed Bamboo, including proteins, xylose syrup, fiber, and lignin, which are insoluble in the alcohol. This powder can be directly used as fuel in biomass or coal-fired power plants, or as an animal feed additive. During steam explosion activation, the ultrafine Reed Bamboo residue powder after flavonoid extraction undergoes high-temperature decomposition of proteins and dissolution of sugars by the steam and hot water. The final ultrafine dry powder contains only cellulose and lignin, making it an ideal raw material for bamboo-based plastics. It can also be used as a high-efficiency, energy-saving, non-coking high-carbon feedstock for the thermal gasification and hydrogenation synthesis of green methanol and green aviation kerosene. This is because flavonoids, proteins, and sugars, which are prone to coking during the thermal gasification of Reed Bamboo powder, are extracted and separated after flavonoid extraction and steam explosion modification, and are no longer present in the thermally gasified powder. This method maximizes the value of Reed Piper longifolia and diversifies market channels. The optimal mode for using Reed Piper longifolia for thermal gasification hydrogenation to produce green methanol is to first pulverize and dry it. However, pulverizing and drying Reed Piper longifolia consumes a lot of energy and is costly. Extracting high-value pharmaceutical and health care raw material flavonoids effectively absorbs the costs of pulverizing and drying Reed Piper longifolia. Then, steam explosion solid-liquid separation of hemicellulose material is used to produce high-value-added bio-resin PLA through biomanufacturing, which absorbs the costs of purifying cellulose and lignin binary ultrafine powder. Finally, an ultrafine powder raw material with almost the same cost as the original raw material Reed Piper longifolia but with a 20% increase in carbon fiber and lignin content is obtained. Compared with the original raw material, it can shorten the thermal gasification time, reduce energy consumption, and increase the carbon-hydrogen ratio, making the chemical pyrolysis process more efficient, with the highest energy efficiency ratio and feed-to-yield ratio, and higher economic efficiency.

[0049] S4. Multi-path product preparation:

[0050] Path A, Material Preparation: Polylactic acid bioresin is prepared by bio-fermentation and chemical reaction of xylose or syrup; bamboo ultrafine fiber wood dry powder is compounded with polylactic acid bioresin to prepare bamboo-based plastic raw material granules.

[0051] Specifically, the preparation of polylactic acid bioresin from syrup through biological fermentation and chemical reaction involves: detoxifying, decolorizing, and adjusting the concentration of the syrup in sequence, followed by fermentation with special mixed bacteria to obtain lactic acid, and then subjecting the lactic acid to chemical reactions including esterification, dehydration polycondensation, depolylactide removal, and ring-opening polymerization to obtain high molecular weight polylactic acid bioresin.

[0052] The preparation of bamboo-based plastic material granules involves melt blending and extruding high-molecular-weight polylactic acid bioresin with ultrafine wood powder of Phyllostachys edulis at a weight ratio of 4:6. The resulting granules can be sold to manufacturers of automotive interior parts, disposable tableware, disposable packaging, and disposable furniture and building materials.

[0053] Specifically, the ultrafine powder obtained after extracting flavonoids from Reed Bamboo is modified by steam explosion using a bio-manufacturing process and steam generated from waste heat power generation. The modified 80 to 100 mesh powder is used as a solid filler in the bamboo-based plastic substitute. The syrup separated by filtration is detoxified, decolorized, and its concentration is adjusted. It is then fermented with special mixed bacteria, esterified, and molecularly distilled to obtain high-purity lactic acid. The lactic acid undergoes dehydration and condensation reaction to generate low-molecular-weight polylactic acid prepolymer. Heating and depolymerization generate cyclic dimer lactide. Distillation separation and purification yield high-optical-purity L-lactide and D-lactide. The purified lactide undergoes ring-opening polymerization under the action of a catalyst (such as stannous octoate) to generate high-molecular-weight polylactic acid bioresin (PLA).

[0054] The high-carbon-content Reed Bamboo ultrafine fiber wood powder after hemicellulose separation enters the fiber wood powder storage silo. Part of it goes into the bamboo-based plastic raw material granulation process, and part of it goes into the Reed Bamboo green methanol and green aviation coal pyrolysis gasification process. It can also be directly sold as a high-grade carbon source to high-end markets such as activated carbon and graphene.

[0055] Route B, Fuel and Chemical Preparation: Powdered ultrafine fiber wood powder of *Arundinaria salsa* is gasified to obtain crude syngas; after purification, hydrogen generated from water electrolysis using renewable energy is added to adjust the hydrogen-to-carbon molar ratio in the syngas to 2:1, followed by catalytic synthesis and distillation to obtain green methanol; a portion of the green methanol is then sequentially dehydrated to produce dimethyl ether, undergoes olefin synthesis, aromatization, fractional distillation purification, and product blending to obtain benzene, toluene, xylene, and green aviation kerosene;

[0056] The gasification process takes place at 850-950℃, using oxygen and water vapor as the gasifying agent. The oxidation-reduction reaction in the gasifier produces crude syngas containing CO, H2, CO2, CH4, and trace amounts of tar and hydrocarbons. The oxygen and hydrogen are derived from renewable energy source electricity electrolysis of water (using a large electrolyzer to produce high-purity hydrogen and oxygen). This renewable energy source includes one or more of wind power, photovoltaic power, or biomass power (using green electricity to supply green hydrogen and green oxygen, meeting the production requirements for green methanol and green jet fuel). The water vapor in the gasifying agent originates from the steam generated by the reaction heat of cooling crude methanol and the reactor during the green methanol synthesis process, as well as the steam discharged from the turbine in the waste heat power generation process attached to the pyrolysis gasification process.

[0057] The waste heat power generation process uses industrial waste heat boilers and industrial steam turbine generator sets to generate electricity, and uses the steam from the steam turbine for drying and distillation in the raw material pretreatment process and flavonoid separation and purification process, steam explosion in the hemicellulose separation process, and gasification agent in the pyrolysis gasification process.

[0058] The purification of crude syngas includes: first, ash removal via a cyclone separator; then, washing away residual tar and fine dust with water or solvent in a scrubbing tower, or removing tar using an electrostatic precipitator; followed by acid gas removal and methane reforming using low-temperature methanol to purify CO and H2, while simultaneously capturing high-purity CO2. This high-purity CO2 is injected into a high-purity CO2 storage tank for adjusting the carbon content of the syngas; any excess can be directly sold to supercritical fluid extraction manufacturers, food and beverage producers, hospitals, and industrial welding protection companies. After purification, the CO and H2 are quantified to replenish the missing hydrogen. Hydrogen from green electrolysis of water is added to adjust the syngas ratio to an H2 / CO ratio of 2:1 before being fed into the green methanol synthesis process.

[0059] The preparation of green methanol is as follows: pure syngas is used in an isothermal shell-and-tube reactor. Under the action of Cu-ZnO-Al2O3 catalyst inside the tube, and at a reaction temperature of 220-280℃ and a pressure of 5.0-10.0 MPa, crude methanol is generated. Boiling water is used to remove the heat of reaction and cool the crude methanol in the shell side of the reactor. The heat of reaction is cooled with water to obtain hot water and hot steam. The hot water and hot steam are sent to the waste heat boiler of the waste heat power generation process to be gasified into superheated steam. Part of the superheated steam is used as steam for gasification, and the other part is used to drive the steam turbine generator set to generate electricity. After the steam is cooled after power generation, it is returned to the waste heat boiler for recycling. The crude methanol is purified by a three-tower distillation system to remove light and heavy components to obtain fuel-grade green methanol products. At the same time, it can also be cooled to obtain low-temperature methanol.

[0060] Crude methanol is purified by a three-tower distillation system to remove light components such as water and dimethyl ether, as well as heavy components such as higher alcohols, to obtain fuel-grade AA-grade green methanol. This product is then stored in green methanol storage tanks. A portion of the product is used in the green aviation kerosene manufacturing process to produce green aviation kerosene. A small amount is used in the low-temperature methanol purification and blending process for acid gas removal and methane reforming to purify CO and H2. The green methanol is primarily sold to ocean-going ship owners and green methanol fuel application companies.

[0061] The process of producing benzene, toluene, xylene, and green aviation kerosene from green methanol is as follows: methanol is dehydrated to produce dimethyl ether; dimethyl ether is reacted to produce light olefins (C2-C5); the light olefins are aromatized (polymerization, cyclization, dehydrogenation, and other series of reactions) under the action of an aromatization catalyst (modifying ZSM-5 zeolite by loading metals such as zinc or gallium to improve the yield of aromatics) to produce an aromatic mixture; the aromatic mixture is refined by fractionation (the aromatic mixture enters a more refined aromatics complex unit, and benzene, toluene, and xylene are obtained through fractionation, extraction, etc.); the light olefins are blended with the separated benzene, toluene, and xylene in a certain proportion to obtain green aviation kerosene.

[0062] S5. System Energy and Material Circulation: The waste heat generated during the synthesis of green methanol and gasification process in Path B is recovered. The generated steam is used for power generation and as a heat source for gasification agent, raw material drying, steam explosion and solvent recovery. High-purity carbon dioxide is produced as a by-product during the synthesis gas purification process.

[0063] The heat generated from the green methanol synthesis reaction heats the cooling water to produce steam, which is then supplied to the reed gasifier as the gasifying agent steam. The waste heat from the reed gasifier is used in a waste heat boiler to generate superheated steam, which is then supplied to an industrial steam turbine to drive a generator for power generation. The low-heat steam discharged after power generation is used partly to supplement the gasifying agent steam in the reed gasifier, partly for drying reeds and reed powder, partly as a steam source for the steam explosion of reed powder activation, and partly for the recovery of alcohol from the wine, thus realizing a closed loop of energy recovery and utilization and a closed loop of solvent recovery and reuse.

[0064] This invention creatively separates the hemicellulose in *Arundinaria repens*, which is harmful to bamboo-based plastics and methanol production via gasification hydrogenation, through physical processing such as ultrafine powdering, extraction, and steam explosion, while bearing the costs of these processes. This yields high-carbon, high-hydrogen ultrafine powder raw materials, which are then used to manufacture green methanol and green aviation kerosene through pyrolysis synthesis. Furthermore, it utilizes special enzyme fermentation and other bio-manufacturing processes to produce bio-resin PLA. This unique method integrates five high-tech industrial methods: bioengineering breeding and seedling cultivation, smart agriculture cultivation and management, physical processing powdering, extraction and separation, chemical pyrolysis synthesis, and bio-enzyme fermentation. It produces high-purity flavonoids, ultrafine *Arundinaria repens* residue powder, ultrafine *Arundinaria repens* wood powder, xylose syrup, bio-resin PLA, bamboo-based plastic granules, high-purity CO2, dimethyl ether (DME), light olefins, benzene, toluene, xylene, green methanol, and green aviation kerosene. Five high-tech industrial methods are interconnected to ensure the development of the Reed Bamboo industry chain, which is characterized by high environmental protection, high carbon sequestration, high yield, high efficiency, low cost, low energy consumption, high quality, and high value.

[0065] The present invention has been described above by way of example. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any improvements made by adopting the inventive concept and technical solution of the present invention, or direct application to other occasions without modification, are all within the protection scope of the present invention.

Claims

1. A co-production method based on the high-value utilization of all components of Phragmites australis, characterized in that, Includes the following steps: S1. Customized raw material supply and pretreatment: Providing raw materials of Reed sedge produced through specific agronomic processes, and cleaning, dehydrating, drying and pre-crushing them to obtain Reed sedge fragments whose properties and specifications meet the requirements of subsequent deep processing; S2. Flavonoid Extraction and Ultrafine Powder Preparation: The reed fragments were compound-pulverized to an ultrafine powder of 80-100 mesh at a temperature below 40℃ in the presence of wine, and flavonoids were extracted in the wine simultaneously. After solid-liquid separation, the liquid phase was purified and separated by multi-stage membrane group and freeze-dried to obtain high-purity flavonoid powder. The small solid particles were distilled and dried to obtain ultrafine dry powder of reed residue, and the large solid particles were returned to compound-pulverization for further flavonoid extraction. S3. Hemicellulose separation and high-carbon powder preparation: The ultrafine dry powder of Reed Bamboo residue is sequentially activated by steam explosion and treated with dilute alkali solution, followed by solid-liquid separation. The separated liquid phase is purified by multi-stage membrane group to obtain xylose or syrup, and the separated solid phase is dried to obtain Reed Bamboo ultrafine fiber wood dry powder. S4. Multi-path product preparation: Path A, Material Preparation: Polylactic acid bioresin is prepared by bio-fermentation and chemical reaction of xylose or syrup; bamboo ultrafine fiber wood dry powder is compounded with polylactic acid bioresin to prepare bamboo-based plastic raw material granules. Route B, Fuel and Chemical Preparation: Gasification of Reed microfiber wood powder yields crude syngas; after purification, hydrogen generated from water electrolysis using renewable energy is added to adjust the hydrogen-carbon molar ratio in the syngas to 2:1, followed by catalytic synthesis and distillation to obtain green methanol; a portion of the green methanol is then subjected to dehydration to produce dimethyl ether, olefin synthesis, aromatization, fractional distillation purification, and product blending to obtain benzene, toluene, xylene, and green aviation kerosene. S5. System Energy and Material Circulation: The waste heat generated during the synthesis of green methanol and gasification process in Path B is recovered. The generated steam is used for power generation and as a heat source for gasification agent, raw material drying, steam explosion and solvent recovery. High-purity carbon dioxide is produced as a by-product during the synthesis gas purification process.

2. The co-production method based on the high-value utilization of all components of Phragmites australis according to claim 1, characterized in that, In step S1, the specific agronomic process includes: screening for multi-carbon genes and polyploid breeding of Reed hyacinth, followed by tissue culture and hardening of seedlings, and then standardized mechanical transplanting at a standard of 1020 plants per mu (approximately 667 square meters) with 2-meter-wide ridges, three rows of seedlings with gaps between rows, and mechanical crushing and harvesting between November and February of the following year to obtain Reed hyacinth segments with stem lengths of 2-5 cm.

3. The co-production method based on the high-value utilization of all components of Phragmites australis according to claim 2, characterized in that, In step S1, the pretreatment includes: cleaning, dehydrating and drying the harvested reed segments at the primary processing base, controlling their moisture content and ash content to not exceed 10%; storing the treated reed segments in a moisture-proof, insect-proof, mildew-proof and ash-proof raw material silo; sending the reed segments in the silo to the raw material pre-crushing process through an automatic conveying device, and sequentially performing low-temperature mechanical pre-crushing at below 40℃ to 1-2 cm, testing and drying to control the moisture content, and then cleaning with alcohol and testing the ash content to obtain clean reed fragments.

4. The co-production method based on the high-value utilization of all components of Phragmites australis according to claim 1, characterized in that, In step S2, the liquor is 68 degrees; the compound pulverization is a combination of liquid pulverizer and steel pulverizer, and the ultrafine pulverization and extraction process is accompanied by ultrasonic treatment with a frequency of 20-40KHz and a power of 300-700W; the liquor is recovered simultaneously during the liquid and solid phase treatment.

5. A co-production method based on the high-value utilization of all components of Phragmites australis according to claim 1, characterized in that, In step S4 path A, the preparation of polylactic acid bioresin from syrup through biological fermentation and chemical reaction is specifically as follows: after the syrup is detoxified, decolorized and its concentration adjusted in sequence, it is fermented by special mixed bacteria to obtain lactic acid, and then the lactic acid is subjected to chemical reactions including esterification, dehydration polycondensation, depolylactide removal and ring-opening polymerization to obtain high molecular weight polylactic acid bioresin.

6. A co-production method based on the high-value utilization of all components of Phragmites australis according to claim 5, characterized in that, In step S4 path A, the preparation of bamboo-based plastic raw material particles is specifically as follows: the bamboo ultrafine fiber wood dry powder and high molecular weight polylactic acid bioresin are melt-blended and extruded into granules at a weight ratio of 4:

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7. The co-production method based on the high-value utilization of all components of Phragmites australis according to claim 1, characterized in that, In step S4 path B, gasification is carried out at 850-950℃, and the gasifying agent contains oxygen and water vapor; the oxygen and hydrogen are derived from water electrolysis using renewable energy power, which is one or more of wind power, photovoltaic power, or biomass power.

8. A co-production method based on the high-value utilization of all components of Phragmites australis according to claim 7, characterized in that, In step S4 path B, the crude syngas purification includes: first, removing ash through a cyclone separator, then washing away residual tar and fine dust with water or solvent in a scrubbing tower or removing tar using an electrostatic precipitator, then using low-temperature methanol for acid gas removal and methane reforming to purify CO and H2, while simultaneously capturing high-purity CO2, which is then injected into a high-purity CO2 storage tank for adjusting the carbon content of the syngas.

9. A co-production method based on the high-value utilization of all components of Phragmites australis according to claim 8, characterized in that, In step S4, path B, the preparation of green methanol is as follows: pure syngas is used in an isothermal shell-and-tube reactor. Under the action of Cu-ZnO-Al2O3 catalyst inside the tube, and at a reaction temperature of 220-280℃ and a pressure of 5.0-10.0 MPa, crude methanol is generated. Boiling water is used to remove the heat of reaction and cool the crude methanol in the shell side of the reactor. The heat of reaction is cooled with water to obtain hot water and hot steam. The hot water and hot steam are sent to the waste heat boiler of the waste heat power generation process to be gasified into superheated steam. Part of the superheated steam is used as steam for gasification, and the other part is used to drive the steam turbine generator set to generate electricity. After the steam is cooled after power generation, it is returned to the waste heat boiler for recycling. The crude methanol is purified by a three-tower distillation system to remove light and heavy components to obtain fuel-grade green methanol products. It can also be cooled to obtain low-temperature methanol.

10. A co-production method based on the high-value utilization of all components of Phragmites australis according to claim 9, characterized in that, In step S4, path B, the process of producing benzene, toluene, xylene, and green aviation kerosene from green methanol is as follows: methanol is dehydrated to produce dimethyl ether; dimethyl ether is reacted to produce light olefins; the light olefins are aromatized under the action of an aromatization catalyst to produce an aromatic mixture; the aromatic mixture is purified by fractional distillation to obtain benzene, toluene, and xylene; the light olefins are blended with the separated benzene, toluene, and xylene in a certain proportion to obtain green aviation kerosene.

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