Waste tire pyrolysis oil hydrolysis and extraction desulfurization method
Through ultrasonic treatment and microwave extraction combined with the synergistic effect of alkaline solution and acetonitrile, the problem of removing high sulfur-containing compounds in pyrolysis oil of waste tires is solved, and efficient desulfurization is achieved under low cost and low operating conditions, satisfying marine diesel standard.
Patent Information
- Application Number
- CN202411246310.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-06
- Publication Date
- 2025-01-03
AI Technical Summary
The prior art contains high sulfur-containing compounds, especially sulfites and benzothiazoles in waste tire pyrolysis oils, which are difficult to effectively remove. The traditional desulfurization method is costly and has strict operating conditions, which affects the economics of the oil.
Ultrasonic treatment and microwave extraction are used to combine alkaline solution and acetonitrile as desulfurization agents. Through hydrolysis and extraction reactions, the sulfite and benzothiazole content in the pyrolyzed oil is reduced, thereby achieving low-cost and low-operational desulfurization.
It effectively reduces the sulfur content of pyrolytic oil to reach below 0.5%, meets the IMO2020 standard, and improves the economic and use value of oil products.
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Figure CN119242328A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of quality improvement of waste tire pyrolysis oil, in particular to a method for hydrolyzing and extracting desulfurization of waste tire pyrolysis oil. Background Art
[0002] With the rapid development of the global automobile industry, the number of waste tires has increased dramatically, which has brought heavy pressure to the environment. The accumulation of waste tires not only occupies a large amount of land resources, but also easily becomes a breeding ground for mosquitoes, spreads diseases, and may even cause fires, posing a serious threat to the environment and human health.
[0003] During the production process of tires, sulfur-containing substances need to be added to vulcanize the rubber, which can improve the performance of tires. This leads to an increase in the sulfur content in waste tires. At present, the treatment methods of waste tires mainly include prototype modification, production of recycled rubber and rubber powder, incineration and pyrolysis. Among them, pyrolysis technology has attracted much attention because it can convert waste tires into high-value-added energy products such as pyrolysis oil, carbon black, steel wire, etc. Pyrolysis technology is a process of decomposing waste tires into gaseous, liquid and solid products by high temperature in an oxygen-deficient or inert gas environment. Previous studies have removed some sulfur-containing compounds through catalytic pyrolysis, but sulfur-containing compounds still exist in pyrolysis oil. With the increasingly stringent environmental protection requirements, these sulfur-containing compounds seriously affect the economy of oil products. The desulfurization of waste tire pyrolysis oil is imminent.
[0004] The traditional hydrodesulfurization method has a good desulfurization effect on pyrolysis oil, but this is only for thiophene compounds. The removal effect of sulfite and benzothiazole in pyrolysis oil has not been reported. At the same time, the catalyst used in hydrodesulfurization is expensive, and the operating conditions require high temperature and high pressure hydrogenation, which undoubtedly greatly increases the cost. Oxidative desulfurization is aimed at substances with large steric hindrance such as benzothiophene, and the desulfurization targets are also sulfite and benzothiazole. At the same time, the oxidation process will also introduce oxygen elements into the oil, which will also reduce the value of the oil and is also uneconomical.
[0005] Therefore, it is necessary to improve the deficiencies in the prior art to solve the above problems. Summary of the invention
[0006] The invention overcomes the shortcomings of the prior art and provides a method for hydrolyzing and extracting desulfurization of waste tire pyrolysis oil. The invention adopts a low-cost hydrolysis method and an extraction method with low operating condition requirements to carry out targeted desulfurization of sulfite and benzothiazole.
[0007] To achieve the above object, the technical solution adopted by the present invention is: a method for hydrolysis and extraction desulfurization of waste tire pyrolysis oil, comprising the following steps:
[0008] S1. Filter a certain amount of waste tire pyrolysis oil to remove solid impurities, and use an ultrasonic crusher to perform ultrasonic treatment to obtain pretreated waste tire pyrolysis oil;
[0009] S2, adding a certain amount of n-hexane to the pretreated waste tire pyrolysis oil for dilution, and then adding a certain volume of desulfurizer to obtain a mixed solution;
[0010] S3, placing the mixed solution in a microwave catalytic synthesis / extraction apparatus, and completing the reaction with magnetic stirring;
[0011] S4. After the reaction is completed, the mixed liquid is separated into layers, the upper layer is the oil phase, and the lower layer is the water phase, and the liquids are separated to obtain the pyrolysis oil after hydrolysis and extraction desulfurization.
[0012] In a preferred embodiment of the present invention, in step S1, the processing power of the ultrasonic crusher is 3-8%, the ultrasonic processing time is 8-15 minutes, and the ultrasonic on and off time is 5 seconds.
[0013] In a preferred embodiment of the present invention, in the step S2, the mass ratio of the waste tire pyrolysis oil to the n-hexane is 1:1-5.
[0014] In a preferred embodiment of the present invention, in step S2, the desulfurizing agent accounts for 50% of the total volume of the mixed liquid.
[0015] In a preferred embodiment of the present invention, in the step S2, the desulfurizing agent consists of an alkaline solution and acetonitrile, and the volume ratio of the alkaline solution to the acetonitrile is 5-9:1-5.
[0016] In a preferred embodiment of the present invention, the alkaline solution is one of calcium hydroxide, sodium hydroxide, potassium hydroxide or metal hydroxide.
[0017] In a preferred embodiment of the present invention, in the step S3, the microwave catalysis conditions are: microwave power 100-400W, microwave frequency 2450MHz.
[0018] In a preferred embodiment of the present invention, in step S3, the rotation speed of the magnetic stirring is 50-300 r / min.
[0019] In a preferred embodiment of the present invention, in the step S3, the reaction conditions are: reaction temperature 293-333K, reaction time 120-150min.
[0020] The present invention provides an application of a method for hydrolyzing and extracting desulfurization of waste tire pyrolysis oil. The method for hydrolyzing and extracting desulfurization of waste tire pyrolysis oil is based on any one of the methods described above, and the method for hydrolyzing and extracting desulfurization of waste tire pyrolysis oil is used to reduce the sulfur content of pyrolysis oil.
[0021] The present invention solves the defects existing in the background technology and has the following beneficial effects:
[0022] (1) The present invention provides a method for hydrolysis and extraction desulfurization of waste tire pyrolysis oil. Through the preparation process of ultrasonic treatment, hydrolysis and microwave extraction and the reasonable selection of process parameters, waste tire pyrolysis oil is used as a raw material. By using an alkaline solution, the sulfite in the pyrolysis oil is hydrolyzed to produce alcohols and water-soluble salts, thereby achieving the purpose of harmless desulfurization. At the same time, acetonitrile reagent is used to extract benzothiazole in the pyrolysis oil. Compared with hydrodesulfurization and oxidative desulfurization, the method is more cost-effective. After the waste tire pyrolysis oil is treated by the present invention, pyrolysis oil with a sulfur content of less than 0.5% can be obtained, which meets the IMO2020 standard and can be used for marine diesel.
[0023] (2) In the present invention, a certain ratio of alkaline solution and acetonitrile is used as a desulfurizing agent. The alkaline solution helps to promote the reaction between the organic matter in the pyrolysis oil and the desulfurizing agent, and acetonitrile, as an extractant, can help extract the organic matter from the pyrolysis oil, thereby increasing the oil yield, and the hydroxide ions (OH - ) can react chemically with sulfur-containing compounds to convert them into easily separated sulfides or sulfates. At the same time, acetonitrile, as an extractant, can further extract sulfides from pyrolysis oil and reduce their relative content. The synergistic effect of alkaline solution and acetonitrile can effectively remove sulfur-containing compounds in pyrolysis oil.
[0024] (3) The appropriate reaction temperature and time in the present invention can accelerate the chemical reaction rate in the pyrolysis oil, making it easier for organic matter to be decomposed and extracted, thereby increasing the oil yield, and enabling the desulfurizer to react more effectively with the sulfur-containing compounds in the pyrolysis oil to convert them into easily separable sulfides or sulfates, thereby reducing the relative content of sulfur-containing compounds in sulfites and benzothiazoles. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work.
[0026] Figure 1 It is a flow chart of a method for hydrolysis and extraction desulfurization of waste tire pyrolysis oil according to a preferred embodiment of the present invention;
[0027] Figure 2 is a response surface diagram of the desulfurization using the desulfurization agent ratio and the reaction temperature in the present invention;
[0028] Figure 3 This is a graph showing the effect of reaction time and temperature on desulfurization used in the present invention;
[0029] Figure 4 is a response surface diagram of the reaction time and temperature for desulfurization in the present invention;
[0030] Figure 5 This is the diagram of the best desulfurization experimental conditions for model fitting. DETAILED DESCRIPTION
[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0032] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.
[0033] It should be noted that the raw materials, equipment and reagents used in the present invention can be purchased from the market or obtained through the preparation methods of existing technologies.
[0034] like Figure 1 As shown, a method for hydrolyzing and extracting desulfurization of waste tire pyrolysis oil comprises the following steps:
[0035] S1. Filter a certain amount of waste tire pyrolysis oil to remove solid impurities, and use an ultrasonic crusher to perform ultrasonic treatment to obtain pretreated waste tire pyrolysis oil;
[0036] S2, adding a certain amount of n-hexane to the pretreated waste tire pyrolysis oil for dilution, and then adding a certain volume of desulfurizer to obtain a mixed solution;
[0037] S3, placing the mixed solution in a microwave catalytic synthesis / extraction apparatus, and completing the reaction with magnetic stirring;
[0038] S4. After the reaction is completed, the mixed liquid is separated into layers, the upper layer is the oil phase, and the lower layer is the water phase, and the liquids are separated to obtain the pyrolysis oil after hydrolysis and extraction desulfurization.
[0039] In some embodiments, in step S1, the processing power of the ultrasonic crusher is 3-8%, the ultrasonic processing time is 8-15 minutes, and the ultrasonic on and off time is 5 seconds.
[0040] In some embodiments, the mass ratio of waste tire pyrolysis oil to n-hexane is 1:1-5; the desulfurizer accounts for 50% of the total volume of the mixed liquid; the desulfurizer consists of an alkaline solution and acetonitrile, and the volume ratio of the alkaline solution to acetonitrile is 5-9:1-5.
[0041] The alkaline solution is one of calcium hydroxide [Ca(OH)2)], sodium hydroxide (NaOH), potassium hydroxide (KOH) or metal hydroxides.
[0042] In some embodiments, in step S3, the conditions for microwave catalysis are: microwave power 100-400W, microwave frequency 2450MHz; magnetic stirring speed 50-300r / min; reaction conditions are: reaction temperature 293-333K, reaction time 120-150min.
[0043] Example 1
[0044] A method for hydrolyzing and extracting desulfurization of waste tire pyrolysis oil comprises the following steps:
[0045] S1. 10 mL of waste tire pyrolysis oil was filtered to remove solid impurities, and ultrasonically treated with an ultrasonic crusher at a power of 5% for 10 min to obtain pretreated waste tire pyrolysis oil;
[0046] S2, adding 10 mL of n-hexane to the pretreated waste tire pyrolysis oil for dilution, and then adding 20 mL of a desulfurizer (KOH solution: acetonitrile = 7:3) to obtain a mixed solution;
[0047] S3, placing the mixed solution in a microwave catalytic synthesis / extraction instrument, reacting at 324K temperature with a microwave power of 300W and a microwave frequency of 2450MHz for 134min, accompanied by magnetic stirring at 200r / min to complete the reaction;
[0048] S4. After the reaction is completed, the mixed liquid is separated into layers, the upper layer is the oil phase, and the lower layer is the water phase and acetonitrile phase, and the liquids are separated to obtain the pyrolysis oil after hydrolysis and extraction desulfurization.
[0049] Example 2
[0050] This embodiment is basically the same as embodiment 1, except that: step S2 is: adding 50 mL of n-hexane to the pretreated waste tire pyrolysis oil for dilution, and then adding 60 mL of a desulfurizer (KOH solution: acetonitrile = 7:3) to obtain a mixed solution.
[0051] Example 3
[0052] This embodiment is basically the same as embodiment 1, except that: step S2 is: adding 10 mL of n-hexane to the pretreated waste tire pyrolysis oil for dilution, and then adding 20 mL of a desulfurizer (KOH solution: acetonitrile = 9:1) to obtain a mixed solution.
[0053] Example 4
[0054] This embodiment is basically the same as embodiment 1, except that: step S2 is: adding 10 mL of n-hexane to the pretreated waste tire pyrolysis oil for dilution, and then adding 20 mL of a desulfurizer (KOH solution: acetonitrile = 5:5) to obtain a mixed solution.
[0055] Example 5
[0056] This embodiment is basically the same as embodiment 1, except that: step S3 is: placing the mixed solution in a microwave catalytic synthesis / extraction instrument, reacting for 120 min at a temperature of 333K with a microwave power of 300 W and a microwave frequency of 2450 MHz, accompanied by a magnetic stirring of 200 r / min to complete the reaction.
[0057] Example 6
[0058] This embodiment is basically the same as embodiment 1, except that: step S3 is: placing the mixed solution in a microwave catalytic synthesis / extraction instrument, reacting for 150 minutes at a temperature of 293K with a microwave power of 300W and a microwave frequency of 2450MHz, accompanied by a magnetic stirring of 200r / min to complete the reaction.
[0059] Comparative Example 1
[0060] This comparative example is basically the same as Example 1, except that: Step S1 is: 10 mL of waste tire pyrolysis oil is filtered to remove solid impurities to obtain pretreated waste tire pyrolysis oil.
[0061] Comparative Example 2
[0062] This comparative example is basically the same as Example 1, except that: Step S2 is: 7 mL of n-hexane is added to the pretreated waste tire pyrolysis oil for dilution, and then 17 mL of a desulfurizer (KOH solution: acetonitrile = 7:3) is added to obtain a mixed solution.
[0063] Comparative Example 3
[0064] This comparative example is basically the same as Example 1, except that: Step S2 is: adding 60 mL of n-hexane to the pretreated waste tire pyrolysis oil for dilution, and then adding 70 mL of a desulfurizer (KOH solution: acetonitrile = 7:3) to obtain a mixed solution.
[0065] Comparative Example 4
[0066] This comparative example is basically the same as Example 1, except that: Step S2 is: adding 10 mL of n-hexane to the pretreated waste tire pyrolysis oil for dilution, and then adding 20 mL of a desulfurizer (KOH solution: acetonitrile = 3:7) to obtain a mixed solution.
[0067] Comparative Example 5
[0068] This comparative example is basically the same as Example 1, except that: Step S3 is: placing the mixed solution in a microwave catalytic synthesis / extraction instrument, reacting for 134 min at a temperature of 285 K with a microwave power of 300 W and a microwave frequency of 2450 MHz, accompanied by a magnetic stirring of 200 r / min to complete the reaction.
[0069] Comparative Example 6
[0070] This comparative example is basically the same as Example 1, except that: Step S3 is: placing the mixed solution in a microwave catalytic synthesis / extraction instrument, reacting for 134 min at a temperature of 342 K with a microwave power of 300 W and a microwave frequency of 2450 MHz, accompanied by a magnetic stirring of 200 r / min to complete the reaction.
[0071] Comparative Example 7
[0072] This comparative example is basically the same as Example 1, except that: Step S3 is: placing the mixed solution in a microwave catalytic synthesis / extraction instrument, reacting for 160 min at a temperature of 324 K with a microwave power of 300 W and a microwave frequency of 2450 MHz, accompanied by a magnetic stirring of 200 r / min to complete the reaction.
[0073] Comparative Example 8
[0074] This comparative example is basically the same as Example 1, except that: Step S3 is: placing the mixed solution in a microwave catalytic synthesis / extraction instrument, reacting for 105 min at a temperature of 324 K with a microwave power of 300 W and a microwave frequency of 2450 MHz, accompanied by a magnetic stirring of 200 r / min to complete the reaction.
[0075] Comparative Example 9
[0076] This comparative example is basically the same as Example 1, except that: Step S3 is: reacting the mixed solution at a temperature of 324K for 134min, accompanied by magnetic stirring at 200r / min to complete the reaction.
[0077] In order to evaluate the specific technical effects of the waste tire pyrolysis oil hydrolysis and extraction desulfurization methods of Examples 1-6 and Comparative Examples 1-9, the differences in some preparation methods between Examples 1-6 and Comparative Examples 1-9, as well as the oil yield and desulfurization rate of the pyrolysis oil after hydrolysis and extraction desulfurization were statistically calculated. The results are shown in Table 1.
[0078] Table 1:
[0079]
[0080]
[0081] As shown in Table 1, by comparing Example 1 with Comparative Example 1, it is known that the mechanical effect and acoustic cavitation effect generated by the high-frequency vibration of ultrasound can break up the aggregates in the waste tire pyrolysis oil, making it easier for the internal organic matter to be released and extracted, which is beneficial to the subsequent mixing effect, enhancing the interaction between molecules, and increasing the oil yield of the pyrolysis oil, thereby increasing the contact area and contact time between the subsequent desulfurizer and the sulfur-containing compounds in the pyrolysis oil, accelerating the movement and diffusion of molecules in the pyrolysis oil, and being beneficial to the desulfurization reaction, thereby making the sulfur-containing compounds easier to be adsorbed and removed by the desulfurizer, and improving the desulfurization effect.
[0082] By comparing Example 1 with Comparative Examples 2 and 3, it is known that n-hexane, as a diluent, can reduce the viscosity of the pyrolysis oil, making it easier to flow and handle. An appropriate amount of n-hexane can effectively dilute the organic matter in the pyrolysis oil and increase the oil yield. It can also selectively form a more stable complex with sulfur-containing compounds to separate them from the pyrolysis oil, promote full contact and reaction between the desulfurizer and the sulfur-containing compounds in the pyrolysis oil, and improve the desulfurization efficiency. When the amount of n-hexane added is too little, the pyrolysis oil cannot be fully diluted, resulting in some organic matter cannot be effectively extracted. When the amount added is too much, the concentration of the pyrolysis oil will be reduced, which will reduce the oil yield, affect the extraction effect, and affect its desulfurization effect.
[0083] By comparing Example 1 with Comparative Example 4, it can be seen that by using a certain ratio of alkaline solution and acetonitrile as a desulfurizing agent, the alkaline solution helps to promote the reaction between the organic matter in the pyrolysis oil and the desulfurizing agent, and acetonitrile as an extractant can help extract the organic matter from the pyrolysis oil, thereby increasing the oil yield, and the hydroxide ions (OH -) can react chemically with sulfur-containing compounds to convert them into easily separated sulfides or sulfates. At the same time, acetonitrile, as an extractant, can further extract sulfides from pyrolysis oil and reduce their relative content. The synergistic effect of alkaline solution and acetonitrile can effectively remove sulfur-containing compounds in pyrolysis oil. When the concentration of the alkaline solution is too low and the amount of acetonitrile added is too much, the desulfurization agent will not be effective, the organic matter cannot be effectively extracted, the oil yield is reduced, and some unnecessary by-products are produced, and the sulfur-containing compounds in the pyrolysis oil cannot be fully removed, thereby affecting the desulfurization effect.
[0084] By comparing Example 1 with Comparative Examples 5 and 6, and by comparing Example 1 with Comparative Examples 7 and 8, it is known that appropriate reaction temperature and time can accelerate the chemical reaction rate in the pyrolysis oil, making it easier for organic matter to be decomposed and extracted, thereby increasing the oil yield, and enabling the desulfurizer to react more effectively with the sulfur-containing compounds in the pyrolysis oil to convert them into easily separated sulfides or sulfates, thereby reducing the relative content of sulfur-containing compounds in sulfites and benzothiazoles. When the reaction temperature is too high and the time is too long, some organic matter in the pyrolysis oil will undergo thermal cracking or oxidation reactions to generate some by-products that are not easy to extract, and the desulfurizer will over-decompose or volatilize. When the reaction temperature is too low and the time is too short, the reaction rate will slow down, resulting in incomplete extraction of organic matter. At the same time, the reaction rate of the desulfurizer and the sulfur-containing compounds will slow down, resulting in poor desulfurization effect, and the sulfur-containing compounds cannot be fully removed, thereby affecting the oil yield and desulfurization rate.
[0085] By comparing Example 1 with Comparative Example 9, it is known that microwave radiation can directly act on molecules, causing the polar substances inside the molecules to be disturbed and hindered with the swing of the high-frequency microwave field, which helps to break the bonds between organic molecules, release more organic matter, promote the decomposition and extraction of organic matter in pyrolysis oil, and thus increase oil production. At the same time, microwave radiation can enhance the collision frequency and energy between molecules, making it easier for desulfurizer molecules and sulfur-containing compound molecules to interact with each other, promoting the reaction between the desulfurizer and the sulfur-containing compounds in the pyrolysis oil, accelerating the transfer and release of sulfur atoms, and thus reducing the relative content of sulfur-containing compounds in sulfites and benzothiazoles.
[0086] The invention adopts the preparation process of ultrasonic treatment, hydrolysis and microwave extraction and the reasonable selection of process parameters. The waste tire pyrolysis oil is used as a raw material. The sulfite in the pyrolysis oil is hydrolyzed by an alkaline solution to produce alcohols and water-soluble salts, thereby achieving the purpose of harmless desulfurization. At the same time, acetonitrile reagent is used to extract benzothiazole in the pyrolysis oil. Compared with hydrodesulfurization and oxidative desulfurization, the invention is more cost-effective. After the waste tire pyrolysis oil is treated by the invention, pyrolysis oil with a sulfur content of less than 0.5% can be obtained, which meets the IMO2020 standard and can use the desulfurized oil for marine diesel.
[0087] The present invention provides a method for finding the optimal process conditions for pyrolysis oil hydrolysis and extractive desulfurization processes by using a regression equation of a response surface model, comprising the following steps:
[0088] (1) The response surface method assigns values to three groups of variables: experimental temperature, reaction time and desulfurizer ratio, as shown in the following table;
[0089] Assignment Reaction temperature (K) Alkaline solution: acetonitrile Reaction time (min) -1 318 9:1 120 0 323 7:3 134 1 328 5:5 150
[0090] (2) Use Design-Expert software to create 17 sets of designed experimental points for the three variables. The 17 sets of experimental values are calculated by Design-Expert software to obtain the following Figure 2 , Figure 3 and Figure 4 3D response surface plot shown;
[0091] (3) Through the optimization analysis process, we determined Figure 5 Optimal ranges and combinations of parameter settings are shown.
[0092] The above is based on the ideal embodiment of the present invention. Through the above description, it is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is limited by the attached claims rather than the above description, and it is intended to include all changes within the meaning and scope of the equivalent elements of the claims. Any figure mark in the claims should not be regarded as limiting the claims involved.
[0093] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.
Claims
1. A method for hydrolysis and extraction desulfurization of waste tire pyrolysis oil, characterized in that: The following steps are involved: S1. Filter a certain amount of waste tire pyrolysis oil to remove solid impurities, and use an ultrasonic crusher to perform ultrasonic treatment to obtain pretreated waste tire pyrolysis oil; S2, adding a certain amount of n-hexane to the pretreated waste tire pyrolysis oil for dilution, and then adding a certain volume of desulfurizer to obtain a mixed solution; S3, placing the mixed solution in a microwave catalytic synthesis / extraction apparatus, and completing the reaction with magnetic stirring; S4. After the reaction is completed, the mixed liquid is separated into layers, the upper layer is the oil phase, and the lower layer is the water phase, and the liquids are separated to obtain the pyrolysis oil after hydrolysis and extraction desulfurization.
2. The method for hydrolysis and extraction desulfurization of waste tire pyrolysis oil according to claim 1, characterized in that: In the step S1, the processing power of the ultrasonic crusher is 3-8%, the ultrasonic processing time is 8-15 minutes, and the ultrasonic on and off time is 5 seconds.
3. The method for hydrolysis and extraction desulfurization of waste tire pyrolysis oil according to claim 1, characterized in that: In the step S2, the mass ratio of the waste tire pyrolysis oil to the n-hexane is 1:1-5.
4. The method for hydrolysis and extraction desulfurization of waste tire pyrolysis oil according to claim 1, characterized in that: In step S2, the desulfurizing agent accounts for 50% of the total volume of the mixed liquid.
5. The method for hydrolysis and extraction desulfurization of waste tire pyrolysis oil according to claim 1, characterized in that: In the step S2, the desulfurizing agent consists of an alkaline solution and acetonitrile, and the volume ratio of the alkaline solution to the acetonitrile is 5-9:1-5.
6. The method for hydrolysis and extraction desulfurization of waste tire pyrolysis oil according to claim 5, characterized in that: The alkaline solution is one of calcium hydroxide, sodium hydroxide, potassium hydroxide or metal hydroxide.
7. The method for hydrolysis and extraction desulfurization of waste tire pyrolysis oil according to claim 1, characterized in that: In the step S3, the microwave catalysis conditions are: microwave power 100-400W, microwave frequency 2450MHz.
8. The method for hydrolysis and extraction desulfurization of waste tire pyrolysis oil according to claim 1, characterized in that: In step S3, the rotation speed of the magnetic stirring is 50-300 r / min.
9. The method for hydrolysis and extraction desulfurization of waste tire pyrolysis oil according to claim 1, characterized in that: In the step S3, the reaction conditions are: reaction temperature 293-333K, reaction time 120-150min.
10. Application of a method for hydrolysis and extraction desulfurization of waste tire pyrolysis oil, characterized in that: The method for hydrolysis and extraction desulfurization of waste tire pyrolysis oil is based on the method described in any one of claims 1 to 9, and the method for hydrolysis and extraction desulfurization of waste tire pyrolysis oil is used to reduce the sulfur content of pyrolysis oil.