Plant source bacteriostatic deodorant based on bio-based waste conversion and preparation method thereof

Abstract

The invention relates to the technical field of environmental functional materials, and discloses a plant-derived bacteriostatic deodorant based on bio-based waste conversion and a preparation method thereof.The method comprises the steps that biomass pyrolysis by-product lignin waste is subjected to filtering, sorting and standing precipitation pretreatment, and primary pyroligneous liquor is obtained; carrying out catalytic conversion on the primary wood vinegar under the action of a catalyst to obtain conversion liquid rich in phenolic active ingredients; meanwhile, performing solvent extraction on yucca plants, tea leaves or Chinese herbal medicines to obtain a plant active extracting solution; and compounding the conversion liquid and the plant extract according to a ratio, adding a surfactant and deionized water, and carrying out high-speed shearing emulsification and curing to obtain the finished deodorant. The raw material purchasing cost is reduced, the requirements of circular economy and sustainable development are met, the rapid and lasting removal effect is achieved, the components are natural, and safety is high.

Description

Technical Field

[0001] This invention relates to the field of environmental functional materials technology, specifically to plant-derived antibacterial and deodorizing agents based on bio-based waste conversion and their preparation methods. Background Technology

[0002] Environmental functional materials are new types of materials aimed at resource recycling and pollution control, belonging to the interdisciplinary field of chemistry, materials and environment.

[0003] Currently, most deodorizing products on the market are chemically synthesized. Although they have obvious immediate effects, they pose potential environmental pollution and biosafety risks. Long-term use can lead to microbial resistance. On the other hand, some deodorizing products made from natural plant extracts are often limited by factors such as high raw material costs and complex extraction processes, making it difficult to achieve large-scale industrial application. They also face the challenge of relatively weaker performance when competing with synthetic products.

[0004] Therefore, this paper proposes a plant-derived antibacterial and deodorizing agent based on bio-based waste conversion and its preparation method to solve the above problems. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a plant-derived antibacterial and deodorizing agent based on bio-based waste conversion and its preparation method, which solves the problems mentioned in the background technology, such as the development of microbial resistance due to long-term use and the difficulty in achieving large-scale industrial application.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a plant-derived antibacterial and deodorizing agent based on bio-based waste conversion and its preparation method, comprising the following steps: Step 1: Raw material pretreatment. Collect lignin waste, a by-product, from the biomass pyrolysis processing workshop, filter and sort it to remove impurities and obtain primary wood vinegar. Step 2: Catalytic conversion. The primary wood vinegar is placed in a reaction vessel, and an acidic or alkaline catalyst is added. Catalytic cracking and reforming reactions are carried out under specific temperature conditions to obtain a conversion liquid rich in phenolic substances. Step 3: Preparation of plant extract. Select one or more plants from the Yucca genus, tea leaves, or traditional Chinese medicinal herbs. After washing, drying, and pulverizing, obtain a high-concentration plant active extract using solvent extraction. Step 4: Compounding and emulsification. The conversion solution obtained in Step 2 and the plant active extract obtained in Step 3 are mixed in a predetermined ratio. Surfactants and deionized water are added, and the mixture is homogenized using a high-speed shear emulsification device to form a stable water-based emulsion. Step 5: Maturation and filling. The emulsified mixture is placed in a sealed container and allowed to mature. Finally, it is packaged to obtain the finished plant-derived antibacterial and deodorizing agent. In step two, the catalyst used in the catalytic conversion process is one of citric acid, tartaric acid, potassium hydroxide, or sodium carbonate, and the amount added is 1% of the weight of the primary wood vinegar. The reaction temperature is controlled at 50℃-80℃, and the reaction time is 2-4 hours.

[0007] Furthermore, in step one, the biomass pyrolysis byproducts are derived from agricultural residues or forest biomass materials. The pretreatment includes: filtering the collected lignin waste through a 100-200 mesh sieve, allowing it to settle and separate into layers at room temperature for 48-72 hours, and taking the middle layer clear liquid as the primary wood vinegar.

[0008] Furthermore, in step one, the primary wood vinegar solution needs to be pH adjusted before use to stabilize its pH value within the range of 3.0-4.0. The pH adjustment uses food-grade glacial acetic acid or lactic acid.

[0009] Furthermore, in step three, the solvent extraction method specifically involves mixing plant raw materials pulverized to 40-60 mesh with a 60%-70% ethanol aqueous solution at a material-to-liquid ratio of 1:8-1:12, refluxing at 60℃-75℃ for 2-3 times, each time for 1-2 hours, combining the extracts, filtering, concentrating, and recovering the ethanol to obtain the plant active extract.

[0010] Furthermore, the weight ratio of the plant active extract to the conversion solution is 1:3 to 1:5, and the surfactant is one or more of Tween-80, alkyl glycoside or fatty acid sorbitan, and the amount added is 0.5%-2% of the total weight of the mixture.

[0011] Furthermore, in step four, the rotation speed of the high-speed shear emulsification equipment is 8000-12000 rpm, the emulsification time is 15-30 minutes, the emulsification temperature is maintained at 40℃-50℃, and after the emulsification process is completed, the particle size of the resulting emulsion should not be greater than 5 micrometers.

[0012] Furthermore, in step five, the curing process is carried out in a light-proof environment, the curing temperature is 20℃-25℃, the curing time is not less than 7 days, and the finished deodorant needs to be filled into an opaque polyethylene or high-density polypropylene container.

[0013] Furthermore, the finished deodorant may also contain 0.1%-0.5% of a natural preservative, which is one of peony bark extract, star anise oil, or grapefruit seed extract.

[0014] Furthermore, the deodorant product prepared by the method must meet the following performance requirements: a 24-hour removal rate of at least 90% for characteristic malodorous gases such as ammonia and hydrogen sulfide, and an inhibition zone diameter of at least 10 mm for Escherichia coli and Staphylococcus aureus.

[0015] Furthermore, the deodorizer is a brownish-amber translucent liquid with a natural plant-smoky aroma and a pH value of 4.0-5.5. It is suitable for controlling environmental odors and microorganisms in livestock farming, homes, sewage treatment, landfills, and hospitals.

[0016] Compared with existing technologies, this invention provides a plant-derived antibacterial and deodorizing agent based on bio-based waste conversion and its preparation method, which has the following beneficial effects: 1. In this invention, by using lignin waste, a byproduct of biomass pyrolysis, as the core raw material, high-value resource utilization of agricultural and forestry waste is realized. Waste that would otherwise cause environmental pollution is transformed into functional products with high added value. This not only reduces the cost of raw material procurement and provides an economically feasible path for the large-scale production of antibacterial and deodorizing agents, but also reduces the environmental pressure caused by waste accumulation from the source, which is in line with the requirements of circular economy and sustainable development.

[0017] 2. In this invention, a specific catalytic conversion process is designed to modify primary wood vinegar. By using acidic or alkaline catalysts under mild conditions to directionally crack and restructure its molecular structure, the content and stability of antibacterial and deodorizing active ingredients such as phenols are improved. This process has high conversion efficiency and mild and controllable reaction conditions, solving the technical problems of low product activity and unstable composition in traditional waste conversion methods, and laying a solid foundation for the preparation of high-efficiency and uniform quality products.

[0018] 3. In this invention, the wood vinegar after catalytic conversion is scientifically compounded with active ingredients extracted from specific plants, and a stable water-based system is formed by using high-speed shear emulsification technology. The final product not only has a rapid and lasting removal effect on typical malodorous gases such as ammonia and hydrogen sulfide, but also exhibits a broad-spectrum inhibitory effect on a variety of common pathogens. Moreover, all ingredients are derived from nature, are environmentally friendly, non-toxic and harmless, highly safe, and have a wide range of applications. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0020] Example 1: A plant-derived antibacterial and deodorizing agent based on bio-based waste conversion and its preparation method, comprising the following steps: Step 1: Raw material pretreatment. Collect lignin waste, a by-product, from the biomass pyrolysis processing workshop, filter and sort it to remove impurities and obtain primary wood vinegar. Step 2: Catalytic conversion. The primary wood vinegar solution is placed in a reaction vessel, and an acidic or alkaline catalyst is added. Catalytic cracking and reforming reactions are carried out under specific temperature conditions to obtain a conversion solution rich in phenolic substances. Step 3: Preparation of plant extract. Select one or more plants from the Yucca genus, tea leaves, or traditional Chinese medicinal herbs. After washing, drying, and pulverizing, obtain a high-concentration plant active extract using solvent extraction. Step 4: Compounding and emulsification. The conversion solution obtained in Step 2 and the plant active extract obtained in Step 3 are mixed in a predetermined ratio. Surfactants and deionized water are added, and the mixture is homogenized by a high-speed shear emulsification device to form a stable water-based emulsion. Step 5: Maturation and filling. Place the emulsified mixture in a sealed container and let it stand to mature. Finally, it is packaged to obtain the finished plant-derived antibacterial and deodorizing agent. In step two, the catalyst used in the catalytic conversion process is one of citric acid, tartaric acid, potassium hydroxide, or sodium carbonate, and the amount added is 1% of the weight of the primary wood vinegar. The reaction temperature is controlled at 50℃ and the reaction time is 2 hours.

[0021] In step one, the biomass pyrolysis byproducts are derived from agricultural residues or forest biomass materials. The pretreatment includes: filtering the collected lignin waste through a 100-mesh sieve, allowing it to settle and separate into layers at room temperature for 48 hours, and taking the middle layer clear liquid as the primary wood vinegar.

[0022] In step one, the pH value of the primary wood vinegar solution needs to be adjusted before use to stabilize it within the range of 3.0-4.0. Food-grade glacial acetic acid or lactic acid is used for pH adjustment.

[0023] In step three, the solvent extraction method is as follows: the plant raw material pulverized to 40 mesh is mixed with a 60% ethanol aqueous solution at a material-to-liquid ratio of 1:8, and refluxed at 60°C for 1 hour each time. The extracts are combined, filtered, concentrated, and the ethanol is recovered to obtain the plant active extract.

[0024] The weight ratio of the plant active extract to the conversion solution is 1:3. The surfactant is one or more of Tween-80, alkyl glycoside or fatty acid sorbitan, and the amount added is 0.5% of the total weight of the mixture.

[0025] In step four, the high-speed shear emulsification equipment rotates at 8000 rpm, the emulsification time is 15 minutes, the emulsification temperature is maintained at 40℃, and after the emulsification process is completed, the particle size of the resulting emulsion should not be greater than 5 micrometers.

[0026] In step five, the curing process is carried out in a dark environment at a curing temperature of 20°C for a curing time of no less than 7 days. The finished deodorant must be packaged in opaque polyethylene or high-density polypropylene containers.

[0027] The finished deodorant may also contain 0.1% of a natural preservative, which is one of the following: peony bark extract, star anise oil, or grapefruit seed extract.

[0028] The deodorant product prepared by the method must meet the following performance requirements: the removal rate of characteristic malodorous gases such as ammonia and hydrogen sulfide within 24 hours shall not be less than 90%, and the diameter of the inhibition zone against Escherichia coli and Staphylococcus aureus shall not be less than 10 mm.

[0029] This deodorizer is a brownish-amber translucent liquid with a natural plant-smoky scent. It has a pH of 4.0 and is suitable for controlling environmental odors and microorganisms in livestock farming, homes, sewage treatment, landfills, and hospitals.

[0030] Example 2: A plant-derived antibacterial and deodorizing agent based on bio-based waste conversion and its preparation method, comprising the following steps: Step 1: Raw material pretreatment. Collect lignin waste, a by-product, from the biomass pyrolysis processing workshop, filter and sort it to remove impurities and obtain primary wood vinegar. Step 2: Catalytic conversion. The primary wood vinegar solution is placed in a reaction vessel, and an acidic or alkaline catalyst is added. Catalytic cracking and reforming reactions are carried out under specific temperature conditions to obtain a conversion solution rich in phenolic substances. Step 3: Preparation of plant extract. Select one or more plants from the Yucca genus, tea leaves, or traditional Chinese medicinal herbs. After washing, drying, and pulverizing, obtain a high-concentration plant active extract using solvent extraction. Step 4: Compounding and emulsification. The conversion solution obtained in Step 2 and the plant active extract obtained in Step 3 are mixed in a predetermined ratio. Surfactants and deionized water are added, and the mixture is homogenized by a high-speed shear emulsification device to form a stable water-based emulsion. Step 5: Maturation and filling. Place the emulsified mixture in a sealed container and let it stand to mature. Finally, it is packaged to obtain the finished plant-derived antibacterial and deodorizing agent. In step two, the catalyst used in the catalytic conversion process is one of citric acid, tartaric acid, potassium hydroxide, or sodium carbonate, and the amount added is 3% of the weight of the primary wood vinegar. The reaction temperature is controlled at 65℃ and the reaction time is 3 hours.

[0031] In step one, the biomass pyrolysis byproducts are derived from agricultural residues or forest biomass materials. The pretreatment includes: filtering the collected lignin waste through a 150-mesh sieve, allowing it to settle and separate into layers at room temperature for 60 hours, and taking the middle layer clear liquid as the primary wood vinegar.

[0032] In step one, the pH value of the primary wood vinegar solution needs to be adjusted before use to stabilize it within the range of 3.5. Food-grade glacial acetic acid or lactic acid is used for pH adjustment.

[0033] In step three, the solvent extraction method is as follows: the plant raw material pulverized to 50 mesh is mixed with 65% ethanol aqueous solution at a material-to-liquid ratio of 1:10, and refluxed at 67.5℃ for 2.5 times, each time for 1.5 hours. The extracts are combined, filtered, concentrated, and the ethanol is recovered to obtain the plant active extract.

[0034] The weight ratio of the plant active extract to the conversion solution is 1:4. The surfactant is one or more of Tween-80, alkyl glycoside or fatty acid sorbitan, and the amount added is 1.25% of the total weight of the mixture.

[0035] In step four, the high-speed shear emulsification equipment rotates at 10,000 rpm, the emulsification time is 22.5 minutes, the emulsification temperature is maintained at 45℃, and after the emulsification process is completed, the particle size of the resulting emulsion should not be greater than 5 micrometers.

[0036] In step five, the curing process is carried out in a dark environment at a curing temperature of 22.5℃ for no less than 7 days. The finished deodorant must be filled into opaque polyethylene or high-density polypropylene containers.

[0037] The finished deodorant may also contain 0.3% of a natural preservative, which is one of the following: peony bark extract, star anise oil, or grapefruit seed extract.

[0038] The deodorant product prepared by the method must meet the following performance requirements: the removal rate of characteristic malodorous gases such as ammonia and hydrogen sulfide within 24 hours shall not be less than 90%, and the diameter of the inhibition zone against Escherichia coli and Staphylococcus aureus shall not be less than 10 mm.

[0039] This deodorizer is a brownish-amber translucent liquid with a natural plant-smoky scent. It has a pH of 4.75 and is suitable for controlling environmental odors and microorganisms in livestock farming, homes, sewage treatment, landfills, and hospitals.

[0040] Example 3: A plant-derived antibacterial and deodorizing agent based on bio-based waste conversion and its preparation method, comprising the following steps: Step 1: Raw material pretreatment. Collect lignin waste, a by-product, from the biomass pyrolysis processing workshop, filter and sort it to remove impurities and obtain primary wood vinegar. Step 2: Catalytic conversion. The primary wood vinegar solution is placed in a reaction vessel, and an acidic or alkaline catalyst is added. Catalytic cracking and reforming reactions are carried out under specific temperature conditions to obtain a conversion solution rich in phenolic substances. Step 3: Preparation of plant extract. Select one or more plants from the Yucca genus, tea leaves, or traditional Chinese medicinal herbs. After washing, drying, and pulverizing, obtain a high-concentration plant active extract using solvent extraction. Step 4: Compounding and emulsification. The conversion solution obtained in Step 2 and the plant active extract obtained in Step 3 are mixed in a predetermined ratio. Surfactants and deionized water are added, and the mixture is homogenized by a high-speed shear emulsification device to form a stable water-based emulsion. Step 5: Maturation and filling. Place the emulsified mixture in a sealed container and let it stand to mature. Finally, it is packaged to obtain the finished plant-derived antibacterial and deodorizing agent. In step two, the catalyst used in the catalytic conversion process is one of citric acid, tartaric acid, potassium hydroxide, or sodium carbonate, and the amount added is 5% of the weight of the primary wood vinegar. The reaction temperature is controlled at 80℃ and the reaction time is 4 hours.

[0041] In step one, the biomass pyrolysis byproducts are derived from agricultural residues or forest biomass materials. The pretreatment includes: filtering the collected lignin waste through a 200-mesh sieve, allowing it to settle and separate into layers at room temperature for 72 hours, and taking the middle layer clear liquid as the primary wood vinegar.

[0042] In step one, the pH value of the primary wood vinegar solution needs to be adjusted before use to stabilize it within the range of 4.0. Food-grade glacial acetic acid or lactic acid is used for pH adjustment.

[0043] In step three, the solvent extraction method is as follows: the plant raw material pulverized to 60 mesh is mixed with a 60%-70% ethanol aqueous solution at a material-to-liquid ratio of 1:12, and refluxed at 75°C for 3 times, 2 hours each time. The extracts are combined, filtered, concentrated, and the ethanol is recovered to obtain the plant active extract.

[0044] The weight ratio of the plant active extract to the conversion solution is 1:5. The surfactant is one or more of Tween-80, alkyl glycoside or fatty acid sorbitan, and the amount added is 2% of the total weight of the mixture.

[0045] In step four, the high-speed shear emulsification equipment rotates at 12,000 rpm, the emulsification time is 30 minutes, the emulsification temperature is maintained at 50℃, and after the emulsification process is completed, the particle size of the resulting emulsion should not be greater than 5 micrometers.

[0046] In step five, the curing process is carried out in a dark environment at a curing temperature of 25°C for no less than 7 days. The finished deodorant must be packaged in opaque polyethylene or high-density polypropylene containers.

[0047] The finished deodorant may also contain 0.5% natural preservatives, which are one of the following: peony bark extract, star anise oil, or grapefruit seed extract.

[0048] The deodorant product prepared by the method must meet the following performance requirements: the removal rate of characteristic malodorous gases such as ammonia and hydrogen sulfide within 24 hours shall not be less than 90%, and the diameter of the inhibition zone against Escherichia coli and Staphylococcus aureus shall not be less than 10 mm.

[0049] This deodorizer is a brownish-amber translucent liquid with a natural plant-smoky scent. It has a pH of 5.5 and is suitable for controlling environmental odors and microorganisms in livestock farming, homes, sewage treatment, landfills, and hospitals.

[0050] Comparative Example 1 differs from Example 1 in that: in the preparation process, the catalytic conversion treatment in step 2 was not carried out in this comparative example, and the pretreated primary wood vinegar was directly used for subsequent compounding and emulsification.

[0051] Comparative Example 2 differs from Example 2 in that the plant active extract prepared in step 3 was not added during the preparation process of this comparative example; only the wood vinegar after catalytic conversion was used for emulsification.

[0052] Comparative Example 3 differs from Example 3 in that: in the compounding and emulsification process of step four, this comparative example does not use high-speed shear emulsification equipment, but instead uses conventional mechanical stirring for mixing.

[0053] Comparative Example 4 differs from Example 3 in that the ripening process is omitted in step 5 of this comparative example, and filling is carried out directly after emulsification.

[0054] The performance of the plant-derived antibacterial and deodorizing agents based on bio-based waste conversion and their preparation methods in Examples 1-3 and Comparative Examples 1-4 were tested. The test items and methods are as follows: Antibacterial rate test: The inhibition zone method was used to test the inhibitory ability of the samples against Escherichia coli and Staphylococcus aureus, the diameter of the inhibition zone was calculated and the antibacterial effect was evaluated.

[0055] Deodorization efficiency test: A fixed amount of ammonia and hydrogen sulfide gas is introduced into a closed environment, and the gas concentration change is monitored after 24 hours to calculate the removal rate.

[0056] Stability test: The sample was placed in a 54℃ constant temperature oven for accelerated storage for 14 days. Its appearance, pH value and emulsification and stratification were observed and recorded to evaluate the product stability.

[0057] Acute oral toxicity test: The acute oral toxicity test in rats was used to determine the median lethal dose and assess the ecological safety of the product.

[0058] The test data of the plant-derived antibacterial and deodorizing agents and their preparation methods based on bio-based waste conversion in Examples 1-3 and Comparative Examples 1-4 are recorded in the table below:

[0059] By comparing and analyzing the data in the table, it can be seen that the plant-derived antibacterial and deodorizing agents and their preparation methods based on bio-based waste conversion in Examples 1-3 are significantly superior in performance to those in Comparative Examples 1-4. This indicates that by using lignin waste, a byproduct of biomass pyrolysis, as the core raw material, high-value resource utilization of agricultural and forestry waste has been achieved. Waste that would otherwise cause environmental pollution has been transformed into functional products with high added value. This not only reduces raw material procurement costs and provides an economically feasible path for the large-scale production of antibacterial and deodorizing agents, but also reduces the environmental pressure caused by waste accumulation at the source, aligning with the requirements of circular economy and sustainable development. Furthermore, the primary wood vinegar liquor can be modified through the design of a specific catalytic conversion process. The process utilizes acidic or alkaline catalysts to directionally pyrolyze and restructure the molecular structure of wood vinegar under mild conditions, thereby increasing the content and stability of antibacterial and deodorizing active ingredients such as phenols. This process boasts high conversion efficiency and mild, controllable reaction conditions, solving the technical challenges of low product activity and unstable composition in traditional waste conversion methods. This lays a solid foundation for preparing high-efficiency, high-quality products. By scientifically compounding the catalytically converted wood vinegar with active ingredients extracted from specific plants and employing high-speed shear emulsification technology to form a stable water-based system, the final product not only has a rapid and long-lasting removal effect on typical malodorous gases such as ammonia and hydrogen sulfide, but also exhibits a broad-spectrum inhibitory effect on a variety of common pathogens. Furthermore, all components are derived from natural sources, making them environmentally friendly, non-toxic, harmless, highly safe, and widely applicable.

[0060] By comparing and analyzing the relevant data in the table, it can be seen that the plant-derived antibacterial and deodorizing agent based on bio-based waste conversion and its preparation method of this invention not only successfully achieves high-value-added resource utilization of bio-based waste, but also demonstrates advantages in core antibacterial and deodorizing performance, product stability, and environmental safety. This indicates that the plant-derived antibacterial and deodorizing agent based on bio-based waste conversion and its preparation method provided by this invention have a broader market prospect and are more suitable for promotion.

[0061] In the description of this specification, references to terms such as "an embodiment," "example," and "specific example" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0062] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A method for preparing plant-derived antibacterial and deodorizing agents based on bio-based waste conversion, characterized in that: Includes the following steps: Step 1: Raw material pretreatment. By-product lignin waste is collected from the biomass pyrolysis processing workshop, filtered and sorted, and impurities are removed to obtain primary wood vinegar. Step 2: Catalytic conversion. The primary wood vinegar is placed in a reaction vessel, and an acidic or alkaline catalyst is added. Catalytic cracking and reforming reactions are carried out under specific temperature conditions to obtain a conversion liquid rich in phenolic substances. Step 3: Preparation of plant extract. Select one or more plants from the Yucca genus, tea leaves, or traditional Chinese medicinal herbs. After washing, drying, and pulverizing, obtain a high-concentration plant active extract using solvent extraction. Step 4: Compounding and emulsification. The conversion solution obtained in Step 2 and the plant active extract obtained in Step 3 are mixed in a predetermined ratio. Surfactants and deionized water are added, and the mixture is homogenized using a high-speed shear emulsification device to form a stable water-based emulsion. Step 5: Maturation and filling. The emulsified mixture is placed in a sealed container and allowed to mature. Finally, it is packaged to obtain the finished plant-derived antibacterial and deodorizing agent. In step two, the catalyst used in the catalytic conversion process is one of citric acid, tartaric acid, potassium hydroxide, or sodium carbonate, and the amount added is 1% of the weight of the primary wood vinegar. The reaction temperature is controlled at 50℃-80℃, and the reaction time is 2-4 hours.

2. The method for preparing plant-derived antibacterial and deodorizing agent based on bio-based waste conversion according to claim 1, characterized in that: In step one, the biomass pyrolysis byproducts are derived from agricultural residues or forest biomass materials. The pretreatment includes: filtering the collected lignin waste through a 100-200 mesh sieve, allowing it to settle and separate into layers at room temperature for 48-72 hours, and taking the middle layer clear liquid as the primary wood vinegar.

3. The method for preparing plant-derived antibacterial and deodorizing agent based on bio-based waste conversion according to claim 1, characterized in that: In step one, the primary wood vinegar solution needs to be pH adjusted before use to stabilize its pH value within the range of 3.0-4.

0. The pH adjustment uses food-grade glacial acetic acid or lactic acid.

4. The method for preparing plant-derived antibacterial and deodorizing agent based on bio-based waste conversion according to claim 1, characterized in that: In step three, the solvent extraction method specifically involves mixing plant raw materials pulverized to 40-60 mesh with a 60%-70% ethanol aqueous solution at a material-to-liquid ratio of 1:8-1:12, refluxing at 60℃-75℃ for 2-3 times, each time for 1-2 hours, combining the extracts, filtering, concentrating, and recovering the ethanol to obtain the plant active extract.

5. The method for preparing plant-derived antibacterial and deodorizing agent based on bio-based waste conversion according to claim 4, characterized in that: The mixing weight ratio of the plant active extract to the conversion solution is 1:3 to 1:

5. The surfactant is one or more of Tween-80, alkyl glycoside, or fatty acid sorbitan, and the amount added is 0.5%-2% of the total weight of the mixture.

6. The method for preparing plant-derived antibacterial and deodorizing agent based on bio-based waste conversion according to claim 1, characterized in that: In step four, the high-speed shear emulsification equipment rotates at 8000-12000 rpm, the emulsification time is 15-30 minutes, the emulsification temperature is maintained at 40℃-50℃, and after the emulsification process is completed, the particle size of the resulting emulsion should not be greater than 5 micrometers.

7. The method for preparing plant-derived antibacterial and deodorizing agent based on bio-based waste conversion according to claim 1, characterized in that: In step five, the curing process is carried out in a light-proof environment, the curing temperature is 20℃-25℃, the curing time is not less than 7 days, and the finished deodorant needs to be filled into opaque polyethylene or high-density polypropylene containers.

8. The method for preparing plant-derived antibacterial and deodorizing agent based on bio-based waste conversion according to claim 1, characterized in that: The finished deodorant may also contain 0.1%-0.5% of a natural preservative, which is one of peony bark extract, star anise oil, or grapefruit seed extract.

9. The method for preparing plant-derived antibacterial and deodorizing agent based on bio-based waste conversion according to claim 1, characterized in that: The deodorant product prepared by the method must meet the following performance requirements: a 24-hour removal rate of at least 90% for characteristic malodorous gases such as ammonia and hydrogen sulfide, and an inhibition zone diameter of at least 10 mm for Escherichia coli and Staphylococcus aureus.

10. A plant-derived antibacterial and deodorizing agent prepared by the method according to any one of claims 1-9, characterized in that: This deodorizer is a brownish-amber translucent liquid with a natural plant-smoky aroma and a pH of 4.0-5.

5. It is suitable for controlling environmental odors and microorganisms in livestock farming, homes, sewage treatment, landfills, and hospitals.

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