A method for increasing the flash point of waste tire pyrolysis oil

Abstract

This invention discloses a method for increasing the flash point of waste tire pyrolysis oil, belonging to the field of waste tire pyrolysis oil processing technology. It includes the following steps: S1, placing waste tire pyrolysis oil and zeolite in a reaction vessel, sealing the reaction vessel, heating the reaction vessel and evacuating it, and stirring the waste tire pyrolysis oil and the zeolite; S2, after processing, cooling the reaction vessel and collecting the gas and pyrolysis oil. This invention solves the technical problems of existing technologies, such as the inability to increase the overall flash point of pyrolysis oil through light and heavy component separation technology, and the increased cost and impact on oil properties caused by adding high flash point additives. It not only increases the overall flash point of waste tire pyrolysis oil but also ensures controllable oil loss and stable properties during the processing.

Description

Technical Field

[0001] This invention belongs to the field of waste tire pyrolysis oil processing technology, and particularly relates to a method for increasing the flash point of waste tire pyrolysis oil. Background Technology

[0002] Currently, pyrolysis technology can convert all components of waste tires into resources, making it an ideal choice for achieving the "reduction, harmlessness, resource utilization, and high value" of waste tire disposal. Waste tire pyrolysis oil accounts for 35%–45% of the pyrolysis products and has broad application prospects in high-end carbon materials, fine chemicals, and high-quality liquid fuels. Furthermore, as a typical product of the circular economy, pyrolysis oil can partially or completely replace petrochemical raw materials in related fields, contributing to the achievement of "dual carbon" goals. However, the high reaction temperature (>400℃) of waste tire pyrolysis leads to the generation of a large amount of light components below C4 and non-condensable combustible gases, which are thoroughly mixed with the pyrolysis oil during the oil and gas collection stage, resulting in an excessively low flash point (<0℃) for the waste tire pyrolysis oil. This low flash point severely limits the large-scale storage, transportation, and application of waste tire pyrolysis oil products.

[0003] Currently, the two main methods for improving the flash point of waste tire pyrolysis oil are as follows: 1. Separating the light and heavy components of waste tire pyrolysis oil (Patent No.: CN202320069104.2; Patent No.: CN202311339700.9); 2. Adding high flash point additives (Patent No.: CN202211597493.2; Patent No.: CN202110802207.0). However, the method of separating the light and heavy components of waste tire pyrolysis oil cannot specifically improve the overall flash point of the oil; the light component distillate still suffers from an excessively low flash point. The method of adding high flash point additives generally has a time-sensitivity issue, and these additives typically contain high molecular weight and surfactant components, thus increasing costs and significantly affecting the properties of the oil.

[0004] Therefore, developing a method that can both increase the overall flash point of waste tire pyrolysis oil and ensure that oil loss during the processing is controllable and the properties are stable is an urgent problem to be solved. Summary of the Invention

[0005] Details of one or more embodiments of the present invention are set forth in the following description to make other features, objects and advantages of the present application more readily apparent.

[0006] This invention proposes a method to improve the flash point of waste tire pyrolysis oil, which solves the technical problems in the prior art, such as the inability to improve the overall flash point of pyrolysis oil through light and heavy component separation technology, and the increase in cost and impact on oil properties by adding high flash point additives. It has the characteristics of not only improving the overall flash point of waste tire pyrolysis oil, but also ensuring that oil loss during the treatment process is controllable and the properties are stable.

[0007] This invention discloses a method for increasing the flash point of waste tire pyrolysis oil, comprising the following steps:

[0008] S1. Place the waste tire pyrolysis oil and zeolite in a reaction vessel, seal the reaction vessel, heat the reaction vessel and evacuate it, and stir the waste tire pyrolysis oil and the zeolite.

[0009] S3. After the processing is completed, the reactor is cooled and the gas and pyrolysis oil are collected.

[0010] In some embodiments, in step S1, the reactor is an ultrasonic reactor, and the processing power of the ultrasonic reactor is adjusted while stirring is being performed.

[0011] In some embodiments, the ultrasonic reactor has a processing power of 60W to 80W.

[0012] In some embodiments, in step S1, the volume ratio of the waste tire pyrolysis oil to the ultrasonic reactor is 0.3 to 0.5.

[0013] In some embodiments, in step S1, the amount of zeolite added is 2wt% to 5wt% of the amount of waste tire pyrolysis oil added.

[0014] In some embodiments, in step S1, after the ultrasonic reactor is evacuated, the vacuum level inside the ultrasonic reactor is 100 Pa to 1200 Pa.

[0015] In some embodiments, in step S1, the temperature of the ultrasonic reactor is 20°C to 40°C.

[0016] In some embodiments, in step S1, the stirring speed of the waste tire pyrolysis oil and the zeolite is 200 r / min to 600 r / min.

[0017] In some embodiments, in step S1, the stirring time of the waste tire pyrolysis oil and the zeolite in the ultrasonic reactor is 3 min to 5 min.

[0018] In some embodiments, in step S2, nitrogen is introduced into the reactor before collecting the gas.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] 1. The present invention discloses a method for improving the flash point of waste tire pyrolysis oil, which can not only significantly improve the overall flash point of waste tire pyrolysis oil, but also effectively reduce the oil loss rate. Unlike the method of separating light and heavy components of waste tire pyrolysis oil, which only improves the flash point of heavy component oil, the light component distillate oil still cannot avoid the problem of excessively low flash point, and this method will greatly increase the oil loss rate.

[0021] 2. This invention can not only significantly improve the overall flash point of waste tire pyrolysis oil, but also effectively ensure the quality of the oil without the need for the addition of other modifiers or chemical reagents. This overcomes the problem of time-sensitivity in improving flash point of such methods and avoids the negative impact of other modifiers or chemical reagents on the quality of the oil.

[0022] 3. This invention employs vacuum degassing coupled with zeolite and ultrasonic gas separation enhancement technology. Compared to existing vacuum degassing technologies, it enhances the transfer and enrichment process of combustible gases in oil, achieving highly efficient removal of combustible gases. Ultrasonic vibration promotes the aggregation of bubbles on zeolite, which further adsorbs and concentrates the bubbles, greatly improving the vacuum degassing efficiency by double and shortening the processing time. Furthermore, this invention significantly improves the overall flash point of the treated pyrolysis oil. While ensuring controllable oil loss and stable oil properties, the overall flash point of the treated pyrolysis oil can reach up to 55°C, with the oil loss rate controllable between 0 and 2.69 wt%. Detailed Implementation

[0023] The technical solutions in the embodiments of the present invention will be clearly and completely described below. 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 skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] This invention provides a method for increasing the flash point of waste tire pyrolysis oil, which includes at least the following steps:

[0025] S1. Place the waste tire pyrolysis oil and zeolite in a reaction vessel, seal the reaction vessel, heat the reaction vessel and evacuate it, and stir the waste tire pyrolysis oil and zeolite.

[0026] S2. After the treatment is completed, cool the reactor and collect the gas and pyrolysis oil.

[0027] This invention not only employs vacuum degassing technology, effectively avoiding the problem that methods for separating light and heavy components of waste tire pyrolysis oil only raise the flash point of the heavy component oil, while the light component distillate oil still cannot avoid the problem of excessively low flash points, but also eliminates the need for the addition of other modifiers or chemical reagents, overcoming the time-sensitive nature of such methods in raising flash points. Furthermore, by coupling zeolite technology, it can further adsorb and concentrate the air bubbles in the waste tire pyrolysis oil, greatly improving the vacuum degassing efficiency and further increasing the flash point of the pyrolysis oil, while also effectively controlling the oil loss rate.

[0028] Furthermore, in step S1, the reactor is an ultrasonic reactor, and the processing power of the ultrasonic reactor is adjusted while stirring is being performed. This invention further employs ultrasonic gas separation enhancement technology to strengthen the transfer and enrichment process of combustible gases in oil, achieving efficient removal of combustible gases. The ultrasonic vibration promotes the aggregation of bubbles on the zeolite, thereby greatly improving the vacuum degassing efficiency, doubling the efficiency, and also shortening the processing time.

[0029] Furthermore, the processing power of the ultrasonic reactor is 60W to 80W. By selecting a processing power of 60W to 80W for the ultrasonic reactor, the overall flash point of the processed cracked oil can be maximized while ensuring controllable oil loss.

[0030] The processing power of the ultrasonic reactor can be 65W, 70W, 75W or any value within the above range, and those skilled in the art can select according to the actual situation.

[0031] Furthermore, in step S1, the volume ratio of waste tire pyrolysis oil to the ultrasonic reactor is 0.3–0.5. This invention, by rationally controlling the loading amount of waste tire pyrolysis oil, can not only effectively control the oil loss rate but also improve the overall flash point of the treated pyrolysis oil.

[0032] The volume ratio of waste tire pyrolysis oil to the ultrasonic reactor can be 0.35, 0.4, 0.45 or any value within the above range, and those skilled in the art can select according to the actual situation.

[0033] Furthermore, in step S1, the amount of zeolite added is 2wt% to 5wt% of the amount of waste tire pyrolysis oil added. This invention, by rationally controlling the amount of zeolite added, can achieve greater adsorption and concentration of bubbles, thereby improving vacuum degassing efficiency.

[0034] The amount of zeolite added can be 3wt%, 4wt%, or any value within the above range, and those skilled in the art can select according to the actual situation.

[0035] Furthermore, in step S1, after the ultrasonic reactor is evacuated, the vacuum level inside the ultrasonic reactor is 100 Pa to 1200 Pa. This invention, by reasonably controlling the vacuum level inside the ultrasonic reactor, can effectively improve the overall flash point of the processed pyrolysis oil while ensuring controllable oil loss.

[0036] Furthermore, in step S1, the temperature of the ultrasonic reactor is 20℃~40℃. This invention, by rationally controlling the temperature of the ultrasonic reactor, can not only effectively control the oil loss rate but also improve the overall flash point of the processed pyrolysis oil.

[0037] The temperature of the ultrasonic reactor can be set to 25℃, 30℃, 35℃ or any value within the above range, and those skilled in the art can select according to the actual situation.

[0038] Furthermore, in step S1, the stirring speed of the waste tire pyrolysis oil and zeolite is 200 r / min to 600 r / min. This invention, by rationally controlling the stirring speed of the waste tire pyrolysis oil and zeolite, can not only effectively control the oil loss rate but also improve the overall flash point of the treated pyrolysis oil.

[0039] Furthermore, in step S1, the stirring time of the waste tire pyrolysis oil and zeolite in the ultrasonic reactor is 3 to 5 minutes. This invention, by rationally controlling the stirring time of the waste tire pyrolysis oil and zeolite in the ultrasonic reactor, can not only effectively control the oil loss rate and oil quality, but also improve the overall flash point of the treated pyrolysis oil.

[0040] The stirring time for waste tire pyrolysis oil and zeolite in the ultrasonic reactor can be 3.5 min, 4 min, 4.5 min or any value within the above range, and those skilled in the art can select according to the actual situation.

[0041] Furthermore, in step S2, nitrogen gas is introduced into the reactor before gas collection. In this invention, introducing nitrogen gas into the reactor before gas collection is more beneficial for gas collection. The amount of nitrogen gas introduced can be determined by those skilled in the art based on actual conditions.

[0042] To further illustrate the present invention, the technical solutions provided by the present invention will be described in detail below with reference to the embodiments, but they should not be construed as limiting the scope of protection of the present invention.

[0043] Example 1

[0044] 300 mL of waste tire pyrolysis oil with a flash point of -5℃ was added to a 1 L reactor. Then, 0.5 wt% zeolite was added, and the flange was sealed. The reactor was heated to 20℃ and evacuated to a vacuum level of 1.2 kPa. The stirring speed was set to 600 r / min. The stirring time for the waste tire pyrolysis oil in the reactor was set to 5 min. After the treatment was completed, the reactor was cooled to room temperature, nitrogen was introduced into the reactor, the gas was collected, the reactor was opened, and the pyrolysis oil was collected.

[0045] Example 2

[0046] 300 mL of waste tire pyrolysis oil with a flash point of -5℃ was added to a 1 L reactor. Then, 2 wt% zeolite was added, and the flange was sealed. The reactor was heated to 20℃ and evacuated to a vacuum level of 1.2 kPa. The stirring speed was set to 600 r / min. The stirring time for the waste tire pyrolysis oil in the reactor was set to 5 min. After the treatment was completed, the reactor was cooled to room temperature, nitrogen was introduced into the reactor, the gas was collected, the reactor was opened, and the pyrolysis oil was collected.

[0047] Example 3

[0048] 300 mL of waste tire pyrolysis oil with a flash point of -5℃ was added to a 1 L reactor, followed by the addition of 5 wt% zeolite, and the flange was sealed. The reactor was heated to 20℃ and evacuated to a vacuum level of 1.2 kPa. The stirring speed was set to 600 r / min. The stirring time for the waste tire pyrolysis oil in the reactor was set to 5 min. After the treatment was completed, the reactor was cooled to room temperature, nitrogen was introduced into the reactor, the gas was collected, the reactor was opened, and the pyrolysis oil was collected.

[0049] Example 4

[0050] 300 mL of waste tire pyrolysis oil with a flash point of -5℃ was added to a 1 L reactor, followed by the addition of 10 wt% zeolite, and the flange was sealed. The reactor was heated to 20℃ and evacuated to a vacuum level of 1.2 kPa. The stirring speed was set to 600 r / min. The stirring time for the waste tire pyrolysis oil in the reactor was set to 5 min. After the treatment was completed, the reactor was cooled to room temperature, nitrogen was introduced into the reactor, the gas was collected, the reactor was opened, and the pyrolysis oil was collected.

[0051] Table 1. Main indicators, oil loss rate, and flash point improvement of cracked oil after treatment with different zeolite addition amounts.

[0052]

[0053] As shown in Table 1, under vacuum and zeolite addition conditions, different zeolite addition amounts have different effects on the flash point and oil loss rate of the treated cracked oil. When the zeolite addition amount is 0.5 wt%, although the oil loss rate is small, the flash point improvement effect of the cracked oil is not obvious. When the zeolite addition amount is 10 wt%, although the flash point of the cracked oil is significantly improved, the oil loss rate is large. Therefore, considering both the flash point improvement effect and the oil loss rate of the treated cracked oil, this invention selects a zeolite addition amount of 2 wt% to 5 wt%.

[0054] Example 5

[0055] 300 mL of waste tire pyrolysis oil with a flash point of -5℃ was added to a 1 L reactor, followed by the addition of 5 wt% zeolite, and the flange was sealed. The reactor was heated to 20℃ and evacuated to a vacuum level of 1.2 kPa. The stirring speed was set to 600 r / min. The stirring time for the waste tire pyrolysis oil in the reactor was set to 5 min. After the treatment was completed, the reactor was cooled to room temperature, nitrogen was introduced into the reactor, the gas was collected, the reactor was opened, and the pyrolysis oil was collected.

[0056] Example 6

[0057] 300 mL of waste tire pyrolysis oil with a flash point of -5℃ was added to a 1 L reactor, followed by the addition of 5 wt% zeolite, and the flange was sealed. The reactor was heated to 40℃ and evacuated to a vacuum level of 1.2 kPa. The stirring speed was set to 600 r / min. The stirring time for the waste tire pyrolysis oil in the reactor was set to 5 min. After the treatment was completed, the reactor was cooled to room temperature, nitrogen was introduced into the reactor, the gas was collected, the reactor was opened, and the pyrolysis oil was collected.

[0058] Example 7

[0059] 300 mL of waste tire pyrolysis oil with a flash point of -5℃ was added to a 1 L reactor, followed by the addition of 5 wt% zeolite, and the flange was sealed. The reactor was heated to 60℃ and evacuated to a vacuum level of 1.2 kPa. The stirring speed was set to 600 r / min. The stirring time for the waste tire pyrolysis oil in the reactor was set to 5 min. After the treatment was completed, the reactor was cooled to room temperature, nitrogen was introduced into the reactor, the gas was collected, the reactor was opened, and the pyrolysis oil was collected.

[0060] Example 8

[0061] Add 300 mL of waste tire pyrolysis oil with a flash point of -5℃ to a 1 L reactor, then add 5 wt% zeolite and seal the flange. Heat the reactor to 80℃ and evacuate it to a vacuum level of 1.2 kPa. Set the stirring speed to 600 r / min. Set the stirring time for the waste tire pyrolysis oil in the reactor to 5 min. After the treatment is complete, cool the reactor to room temperature, purge it with nitrogen, collect the gas, open the reactor, and collect the pyrolysis oil.

[0062] Table 2. Main indicators, oil loss rate, and flash point improvement of cracked oil after treatment at different temperatures.

[0063]

[0064] As shown in Table 2, under vacuum and zeolite addition conditions, different temperatures have different effects on the flash point and oil loss rate of the treated pyrolysis oil. When the temperature inside the reactor is 60℃~80℃, although the flash point of the pyrolysis oil is significantly increased, the oil loss rate is also large, significantly higher than 3wt%. Therefore, this invention combines the flash point increase effect and oil loss rate of the treated pyrolysis oil and controls the temperature inside the reactor at 20℃~40℃.

[0065] Example 9

[0066] 300 mL of waste tire pyrolysis oil with a flash point of -5℃ was added to a 1 L ultrasonic reactor. Then, 5 wt% zeolite was added, and the flange was sealed. The ultrasonic reactor was heated to 40℃ and evacuated to a vacuum level of 1.2 kPa. The stirring speed was set to 600 r / min, and the processing power of the ultrasonic reactor was set to 60 W. The stirring time for the waste tire pyrolysis oil in the ultrasonic reactor was set to 5 min. After processing, the ultrasonic reactor was cooled to room temperature, nitrogen was introduced into the reactor, the gas was collected, the ultrasonic reactor was opened, and the pyrolysis oil was collected.

[0067] Example 10

[0068] 300 mL of waste tire pyrolysis oil with a flash point of -5℃ was added to a 1 L ultrasonic reactor. Then, 5 wt% zeolite was added, and the flange was sealed. The ultrasonic reactor was heated to 40℃ and evacuated to a vacuum level of 1.2 kPa. The stirring speed was set to 600 r / min, and the processing power of the ultrasonic reactor was set to 80 W. The stirring time for the waste tire pyrolysis oil in the ultrasonic reactor was set to 5 min. After processing, the ultrasonic reactor was cooled to room temperature, nitrogen was introduced into the reactor, the gas was collected, the ultrasonic reactor was opened, and the pyrolysis oil was collected.

[0069] Example 11

[0070] 300 mL of waste tire pyrolysis oil with a flash point of -5℃ was added to a 1 L ultrasonic reactor. Then, 5 wt% zeolite was added, and the flange was sealed. The ultrasonic reactor was heated to 40℃ and evacuated to a vacuum level of 1.2 kPa. The stirring speed was set to 600 r / min, and the processing power of the ultrasonic reactor was set to 100 W. The stirring time for the waste tire pyrolysis oil in the ultrasonic reactor was set to 5 min. After processing, the ultrasonic reactor was cooled to room temperature, nitrogen was introduced into the reactor, the gas was collected, the ultrasonic reactor was opened, and the pyrolysis oil was collected.

[0071] Table 3. Main indicators, oil loss rate, and flash point improvement of pyrolysis oil after treatment with different ultrasonic power.

[0072]

[0073] As shown in Table 3, under the conditions of vacuuming, adding zeolite, and ultrasonic treatment, different ultrasonic treatment powers have different effects on the flash point and oil loss rate of the treated pyrolysis oil. When the ultrasonic treatment power is 100W, although the flash point of the pyrolysis oil is significantly improved, the oil loss rate is also relatively high. Therefore, considering both the flash point improvement effect and the oil loss rate of the treated pyrolysis oil, the treatment power of the ultrasonic reactor is adjusted to 60W to 80W.

[0074] Example 12

[0075] 300 mL of waste tire pyrolysis oil with a flash point of -5℃ was added to a 1 L ultrasonic reactor. Then, 5 wt% zeolite was added, and the flange was sealed. The ultrasonic reactor was heated to 40℃ and evacuated to a vacuum level of 1.2 kPa. The stirring speed was set to 600 r / min, and the processing power of the ultrasonic reactor was set to 80 W. The stirring time for the waste tire pyrolysis oil in the ultrasonic reactor was set to 1 min. After processing, the ultrasonic reactor was cooled to room temperature, nitrogen was introduced into the reactor, the gas was collected, the ultrasonic reactor was opened, and the pyrolysis oil was collected.

[0076] Example 13

[0077] 300 mL of waste tire pyrolysis oil with a flash point of -5℃ was added to a 1 L ultrasonic reactor. Then, 5 wt% zeolite was added, and the flange was sealed. The ultrasonic reactor was heated to 40℃ and evacuated to a vacuum level of 1.2 kPa. The stirring speed was set to 600 r / min, and the processing power of the ultrasonic reactor was set to 80 W. The stirring time for the waste tire pyrolysis oil in the ultrasonic reactor was set to 3 min. After processing, the ultrasonic reactor was cooled to room temperature, nitrogen was introduced into the reactor, the gas was collected, the ultrasonic reactor was opened, and the pyrolysis oil was collected.

[0078] Example 14

[0079] 300 mL of waste tire pyrolysis oil with a flash point of -5℃ was added to a 1 L ultrasonic reactor. Then, 5 wt% zeolite was added, and the flange was sealed. The ultrasonic reactor was heated to 40℃ and evacuated to a vacuum level of 1.2 kPa. The stirring speed was set to 600 r / min, and the processing power of the ultrasonic reactor was set to 80 W. The stirring time for the waste tire pyrolysis oil in the ultrasonic reactor was set to 5 min. After processing, the ultrasonic reactor was cooled to room temperature, nitrogen was introduced into the reactor, the gas was collected, the ultrasonic reactor was opened, and the pyrolysis oil was collected.

[0080] Example 15

[0081] 300 mL of waste tire pyrolysis oil with a flash point of -5℃ was added to a 1 L ultrasonic reactor. Then, 5 wt% zeolite was added, and the flange was sealed. The ultrasonic reactor was heated to 40℃ and evacuated to a vacuum level of 1.2 kPa. The stirring speed was set to 600 r / min, and the processing power of the ultrasonic reactor was set to 80 W. The stirring time for the waste tire pyrolysis oil in the ultrasonic reactor was set to 10 min. After processing, the ultrasonic reactor was cooled to room temperature, nitrogen was introduced into the reactor, the gas was collected, the ultrasonic reactor was opened, and the pyrolysis oil was collected.

[0082] Table 4. Main parameters, oil loss rate, and flash point improvement of the cracked oil after different stirring times.

[0083]

[0084]

[0085] As shown in Table 4, under the conditions of vacuuming, adding zeolite, and ultrasonic treatment, different stirring times have different effects on the flash point and oil loss rate of the treated pyrolysis oil. When the stirring time is 1 min, although the oil loss rate is small, the increase in flash point of the pyrolysis oil is not significant. When the stirring time is 10 min, although the flash point of the pyrolysis oil is higher, the oil loss rate is larger. Therefore, considering both the flash point improvement effect and the oil loss rate of the treated pyrolysis oil, this invention controls the stirring time to be between 3 min and 5 min.

[0086] Comparative Example 1

[0087] Add 300 mL of waste tire pyrolysis oil with a flash point of -5℃ to a 1 L reactor and seal the flange. Heat the reactor to 20℃ and evacuate it to a vacuum level of 1.2 kPa. Set the stirring speed to 600 r / min. Set the stirring time for the waste tire pyrolysis oil in the reactor to 5 min. After the treatment is complete, cool the reactor to room temperature, purge it with nitrogen, collect the gas, open the reactor, and collect the pyrolysis oil.

[0088] Comparative Example 2

[0089] Add 500 mL of waste tire pyrolysis oil with a flash point of -5℃ to a 1 L reactor and seal the flange. Heat the reactor to 20℃ and evacuate it to a vacuum level of 1.2 kPa. Set the stirring speed to 600 r / min. Set the stirring time for the waste tire pyrolysis oil in the reactor to 5 min. After the treatment is complete, cool the reactor to room temperature, purge it with nitrogen, collect the gas, open the reactor, and collect the pyrolysis oil.

[0090] Based on the above comparative examples 1 and 2, the main indicators, oil loss rate, and flash point improvement effect of different waste tire pyrolysis oils are shown in Table 1:

[0091] Table 5. Main indicators, oil loss rate, and flash point improvement effect of pyrolyzed oil after treatment under different waste tire pyrolyzed oil loading.

[0092]

[0093] Note: The waste tire pyrolysis oil loading volume is the ratio of the waste tire pyrolysis oil volume to the volume of the ultrasonic reactor.

[0094] As can be seen from the data of Comparative Examples 1-2 in Table 5, under the condition of only vacuuming without adding zeolite and without ultrasonic treatment, compared with the conditions of adding zeolite or adding zeolite and ultrasonic treatment in Examples 1-15, the flash point of the treated cracked oil was not significantly improved.

[0095] Based on the data from the above embodiments and comparative examples, it can be seen that under a vacuum degree of 1.2 kPa, with a waste tire pyrolysis oil loading of 0.3–0.5%, a zeolite addition of 2 wt%–5 wt.%, an ultrasonic reactor temperature of 20°C–40°C, a stirring rate of 600 r / min, a processing power of 60 W–80 W, and a processing time of 3 min–5 min, the overall flash point of the treated pyrolysis oil can be increased to as high as 55°C while ensuring the oil loss rate. Furthermore, the efficiency of vacuum degassing is greatly improved, and the overall flash point of the treated pyrolysis oil can be increased to as high as 55°C within a processing time of 3 min–5 min.

[0096] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0097] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A method for increasing the flash point of waste tire pyrolysis oil, characterized in that, Includes the following steps: S1. Place the waste tire pyrolysis oil and zeolite in a reaction vessel, seal the reaction vessel, heat the reaction vessel and evacuate it, and stir the waste tire pyrolysis oil and the zeolite. S2. After the processing is completed, the reactor is cooled and the gas and pyrolysis oil are collected. In step S1, the reactor is an ultrasonic reactor, and the processing power of the ultrasonic reactor is adjusted while stirring is being performed. The amount of zeolite added is 2wt% to 5wt% of the amount of waste tire pyrolysis oil added. After the reactor is evacuated, the vacuum level inside the reactor is 100 Pa to 1200 Pa. The processing power of the ultrasonic reactor is 60 W to 80 W; The temperature of the ultrasonic reactor is 20℃~40℃; The stirring speed of the waste tire pyrolysis oil and the zeolite is 200 r / min to 600 r / min; The stirring time for the waste tire pyrolysis oil and the zeolite in the ultrasonic reactor is 3 min to 5 min.

2. The method for increasing the flash point of waste tire pyrolysis oil according to claim 1, characterized in that, In step S1, the volume ratio of the waste tire pyrolysis oil to the ultrasonic reactor is 0.3 to 0.

5.

3. The method for increasing the flash point of waste tire pyrolysis oil according to claim 1, characterized in that, In step S2, before collecting the gas, nitrogen gas is introduced into the reaction vessel.

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