Sustainable carbon black and method for making same

Abstract

The application provides a kind of sustainable carbon black and its preparation method, method includes the filtration pyrolysis oil into distillation system, to obtain light TPO fuel oil and heavy TPO raw oil;Light TPO fuel oil is mixed and combusted with first preheated air in the combustion section of reaction furnace, to generate high-temperature gas flow, heavy TPO raw oil is mixed with catalyst and sprayed into the throat section of reaction furnace, to generate high-temperature carbon black-containing flue gas;High-temperature carbon black-containing flue gas is cooled and treated and multi-stage heat exchange, to obtain carbon black-containing cooling flue gas, and then obtain powdered carbon black and recovery tail gas;Powdered carbon black is surface modified and prepared as sCB carbon black, and sCB carbon black is dried by recovery tail gas.The energy internal circulation system is constructed by multi-stage heat exchange and recovery tail gas utilization;The functional interface adapted to rubber matrix is constructed on the surface of powdered carbon black by surface modification treatment, to make up for the defects of powdered carbon black itself.

Description

Technical Field

[0001] This invention relates to the field of industrial production technology, and in particular to a sustainable carbon black and its preparation method. Background Technology

[0002] Carbon black, also known as lampblack, is an amorphous black solid of carbon with a large surface area. It is insoluble in water, acids, and alkalis and has applications in fields such as tires and ceramics. In the tire industry, it is used as a reinforcing filler, while in the ceramics industry, it is used as a colorant, sintering aid, and other additives. The preparation of virgin carbon black relies entirely on fossil raw materials such as petroleum and coal tar. It is a key reinforcing filler in tire manufacturing, and its production process is energy-intensive and has a high carbon emission intensity.

[0003] With the surge in global car ownership, the amount of waste tires generated is enormous, creating serious "black pollution." Traditional disposal methods such as stockpiling, landfilling, or simple incineration not only occupy land but also cause secondary pollution and waste resources. Thermochemical technology can convert waste tires into pyrochemical oil, pyrochemical gas, and pyrochemical carbon black, and is considered an effective way to utilize resources.

[0004] However, the pyrolysis carbon black obtained from pyrolysis tires has high ash content (usually 12%-16%), low structure, poor surface activity, and large performance fluctuations, making it difficult to meet the quality requirements of tire reinforcement fillers. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the present invention aims to provide a sustainable carbon black and its preparation method, thereby solving the technical problems of high ash content, low structure, poor surface activity, and large performance fluctuations in pyrolyzed tire carbon black obtained from pyrolyzed tires, which make it difficult to meet the quality requirements of tire reinforcement fillers.

[0006] To achieve the above objectives, in a first aspect, the present invention provides a method for preparing sustainable carbon black, comprising the following steps: Waste tire pyrolysis oil is precisely filtered to obtain filtered pyrolysis oil. The filtered pyrolysis oil is heated to a first preset temperature and then fed into a distillation system to obtain light TPO fuel oil and heavy TPO feedstock oil. The light TPO fuel oil is mixed and burned with the first preheated air in the combustion section of the reactor to generate a high-temperature gas flow. The heavy TPO feedstock oil is heated to a second preset temperature and mixed with the catalyst before being injected into the throat section of the reactor. High-temperature carbon black flue gas is generated based on the high-temperature gas flow. The high-temperature carbon black-containing flue gas is cooled and subjected to multi-stage heat exchange to obtain carbon black-containing cooled flue gas. The carbon black-containing cooled flue gas is then fed into the main bag filter to obtain powdered carbon black and recovered tail gas. The powdered carbon black is acid-washed with an acid washing solution to obtain first-stage carbon black powder. The first-stage carbon black powder is then washed with water to obtain second-stage carbon black powder. The second-stage carbon black powder is placed in a plasma reactor, and a strong bonding layer, a flexible transition layer, and a functional regulation layer are sequentially deposited on the surface of the second-stage carbon black powder to obtain modified carbon black powder. The modified carbon black powder is adapted to a rubber matrix and is prepared into sCB carbon black. The sCB carbon black is then dried using the recovered tail gas.

[0007] Furthermore, the distillation system includes a first distillation column and a second distillation column, and the step of feeding the filtered cracked oil into the distillation system to obtain light TPO fuel oil and heavy TPO feedstock includes: The filtered cracked oil is fed into the first distillation column, and light TPO fuel oil is obtained from the top of the first distillation column, and heavy oil is obtained from the bottom of the first distillation column. The first bottom heavy oil is fed into the second distillation column, the top essential oil is obtained from the top of the second distillation column, and the second bottom heavy oil is obtained from the bottom of the second distillation column. The top essential oil and the filtered second bottom heavy oil are mixed to form heavy TPO feedstock oil.

[0008] Furthermore, the first preset temperature is 130℃~150℃, and the temperature at the bottom of the second distillation column is 175℃~195℃.

[0009] Furthermore, the temperature of the first preheated air is 900℃~1000℃, the second preset temperature is 220℃~300℃, and the temperature of the high-temperature airflow is 1900℃~2100℃.

[0010] Furthermore, the step of cooling the high-temperature carbon black-containing flue gas and performing multi-stage heat exchange to obtain cooled carbon black-containing flue gas includes: First quench water is injected into the primary quenching section of the reactor to cool the high-temperature carbon black-containing flue gas to a third preset temperature and form a first cooling gas. The first cooling gas is input into the air preheater to heat the first air in the air preheater into the second preheated air, and to cool the first cooling gas in the air preheater into the second cooling gas. The second preheated air is then transferred to the combustion section of the reactor. The second cooling gas is input into the exhaust gas preheater to heat the second air in the exhaust gas preheater into auxiliary combustion air, and to cool the second cooling gas in the exhaust gas preheater into a third cooling gas, and then the auxiliary combustion air is transmitted to the combustion section of the reactor. The third cooling gas is input into the feedstock preheater used to store the heavy TPO feedstock oil to heat the heavy TPO feedstock oil and cool the third cooling gas in the feedstock preheater into a fourth cooling gas. The fourth cooling gas is input into the secondary quenching section, and the fourth cooling gas is cooled to the fourth preset temperature by the second quenching water, forming carbon black-containing cooling flue gas.

[0011] Furthermore, the third preset temperature is 950℃~1000℃, and the fourth preset temperature is 240℃~280℃.

[0012] Furthermore, the step of sequentially depositing a strong bonding layer, a flexible transition layer, and a functional regulation layer on the surface of the carbon black powder in the second stage includes: A first mixed gas, comprising acrylic monomer vapor and argon, is introduced into the plasma reactor to form a strong bonding layer on the surface of the carbon black powder in the second stage. A second mixed gas, comprising hexamethyldisiloxane monomer vapor and argon, is introduced into the plasma reactor to form a flexible transition layer on the surface of the strongly bonded layer. A third mixed gas, comprising perfluorooctane monomer vapor and argon, is introduced into the plasma reactor to form a functional control layer on the surface of the flexible transition layer.

[0013] Furthermore, the step of preparing the modified carbon black powder into sCB carbon black specifically includes: The modified carbon black powder, granulation water, and basic binder are mixed to form a carbon black paste; A reinforcing additive is added to the carbon black paste and stirred to obtain a mixed paste, which is then prepared as sCB carbon black.

[0014] In a second aspect, the present invention provides a sustainable carbon black, which is prepared by the method for preparing sustainable carbon black as described in the first aspect above.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: Using waste tire pyrolysis oil instead of tires as pyrolysis feedstock results in higher feedstock purity. Combined with subsequent distillation of the filtered pyrolysis oil into light TPO fuel oil and heavy TPO feedstock oil, fine separation of the oil products is achieved, ensuring the purity and reactivity of the pyrolysis feedstock from the source, providing a foundation for obtaining low-ash, high-performance carbon black. The high-temperature gas flow generated from the light TPO fuel oil, which then performs high-temperature pyrolysis on the heavy TPO feedstock oil, achieves energy recycling to a certain extent. Multi-stage heat exchange and the use of the recovered tail gas for drying the sCB carbon black further improve the internal energy circulation system. Surface modification of the powdered carbon black creates a functional interface compatible with the rubber matrix, compensating for the inherent defects of the powdered carbon black. Based on the aforementioned oil separation, the finished quality of the sCB carbon black is further improved, enabling it to meet the quality requirements of tire reinforcement fillers. Attached Figure Description

[0016] Figure 1 This is a flowchart of the method for preparing sustainable carbon black in Example 1 of the present invention; The following detailed description, in conjunction with the accompanying drawings, will further illustrate the present invention. Detailed Implementation

[0017] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Several embodiments of the invention are illustrated in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

[0018] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0020] Please see Figure 1In a first aspect, Embodiment 1 of the present invention provides a method for preparing sustainable carbon black, comprising the following steps: S10: Precision filtration of waste tire pyrolysis oil to obtain filtered pyrolysis oil, heating the filtered pyrolysis oil to a first preset temperature, and inputting the filtered pyrolysis oil into a distillation system to obtain light TPO fuel oil and heavy TPO feedstock oil. By performing the aforementioned precision filtration, impurities carried in the waste tire pyrolysis oil can be removed, and the filtered pyrolysis oil can be obtained. Using the waste tire pyrolysis oil instead of tires as the pyrolysis feedstock results in higher feedstock purity. Preferably, the first preset temperature is 130℃~150℃; in this embodiment, the first preset temperature is 140℃.

[0021] Specifically, step S10 includes: S110: The filtered cracked oil is fed into the first distillation column, and light TPO fuel oil is obtained from the top of the first distillation column, and first bottom heavy oil is obtained from the bottom of the first distillation column. S120: Input the first bottom heavy oil into the second distillation column, obtain the top oil from the top of the second distillation column, and obtain the second bottom heavy oil from the bottom of the second distillation column. Mix the top oil with the filtered second bottom heavy oil to form heavy TPO feedstock oil. Preferably, the temperature at the bottom of the second distillation column is 175°C to 195°C. In this embodiment, the temperature at the bottom of the second distillation column is 185°C. It should be noted that after obtaining the heavy oil from the bottom of the second column, the heavy oil is filtered to remove heavy impurities such as gums before being mixed with the essential oil from the top of the column (rich in polycyclic aromatic hydrocarbons, such as phenanthrene, anthracene, and pyrene, with high nucleation activity).

[0022] By distilling the filtered pyrolysis oil into the light TPO fuel oil (rich in chain hydrocarbons and monocyclic aromatics, with high calorific value and good combustion characteristics) and the heavy TPO feedstock oil, the oil products are finely separated, ensuring the purity and reactivity of the pyrolysis feedstock from the source, and providing a foundation for obtaining low-ash, high-performance carbon black.

[0023] S20: The light TPO fuel oil is mixed and burned with the first preheated air in the combustion section of the reactor to generate a high-temperature gas flow, the heavy TPO feedstock oil is heated to a second preset temperature, and mixed with the catalyst and injected into the throat section of the reactor, and high-temperature carbon black flue gas is generated based on the high-temperature gas flow. Preferably, the temperature of the first preheated air is 900℃~1000℃. In this embodiment, the first preheated air is 950℃, the temperature of the high-temperature airflow is 2000℃, and the second preset temperature is 260℃. After the high-temperature airflow is mixed with the heavy TPO feedstock oil containing the catalyst, it will rapidly pyrolyze and generate carbon black. In this embodiment, the catalyst is a potassium carbonate solution, which is formed by dissolving potassium carbonate powder in water. Before the heavy TPO feedstock oil enters the throat section, the heavy TPO feedstock oil and potassium carbonate solution are placed in a stirring tank and stirred evenly before being sprayed into the throat section. By adding the catalyst, the activation energy of the pyrolysis reaction can be effectively reduced, the carbon black yield can be increased, and its particle structure can be optimized, resulting in a more concentrated particle size distribution. The high-temperature airflow generated based on the light TPO fuel oil is used to perform high-temperature pyrolysis on the heavy TPO feedstock oil, thus achieving energy recycling to a certain extent.

[0024] S30: Cool the high-temperature carbon black-containing flue gas and perform multi-stage heat exchange to obtain carbon black-containing cooled flue gas. Input the carbon black-containing cooled flue gas into the main bag filter to obtain powdered carbon black and recovered tail gas. Specifically, step S30 includes: S310: First quench water is injected into the primary quenching section of the reactor to cool the high-temperature carbon black-containing flue gas to a third preset temperature and form a first cooling gas. By spraying in the first quenching water, the temperature of the high-temperature carbon black-containing flue gas can be rapidly reduced, cooling and terminating the carbon black pyrolysis reaction. Preferably, the third preset temperature is 950℃~1000℃. In this embodiment, the third preset temperature is 970℃.

[0025] S320: The first cooling gas is input into the air preheater to heat the first air in the air preheater into the second preheated air, and the first cooling gas in the air preheater is cooled into the second cooling gas, and the second preheated air is transferred to the combustion section of the reactor. Understandably, when the first cooling gas enters the air preheater, it exchanges heat with the first air to complete the heating operation of the first air. The second preheated air is then transported to the combustion section to work with the first preheated air to continuously generate a high-temperature airflow.

[0026] S330: The second cooling gas is input into the exhaust gas preheater to heat the second air in the exhaust gas preheater into auxiliary combustion air, and the second cooling gas in the exhaust gas preheater is cooled into a third cooling gas, and the auxiliary combustion air is transmitted to the combustion section of the reactor. Understandably, the second air is also heated through heat exchange with the second cooling gas, and the auxiliary combustion air also works in conjunction with the first preheated air to continuously generate a high-temperature airflow. The first air and the second air are both air, used only to distinguish their different locations.

[0027] S340: The third cooling gas is input into the feedstock preheater for storing the heavy TPO feedstock oil to heat the heavy TPO feedstock oil and cool the third cooling gas in the feedstock preheater into a fourth cooling gas. Understandably, this step allows the heavy TPO feedstock oil to be heated to a second preset temperature, and further reduces the gas temperature. Through cascaded waste heat recovery, the heat from the high-temperature carbon black-containing flue gas is used step-by-step to prepare raw materials for different production processes, improving the system's thermal efficiency.

[0028] S350: The fourth cooling gas is input into the secondary quench section, and the fourth cooling gas is cooled to the fourth preset temperature by the second quench water, forming carbon black-containing cooling flue gas; Preferably, the fourth preset temperature is 240℃~280℃; in this embodiment, the fourth preset temperature is 260℃. By performing secondary rapid cooling, the carbon black-containing cooled flue gas can be made compatible with the filter bag material of the subsequent main bag filter, avoiding damage to the filter bag. Simultaneously, by performing multi-stage heat exchange, the significant consumption of rapid cooling resources caused by directly cooling to the fourth preset temperature can be saved, thus reducing production costs.

[0029] When the flue gas containing carbon black enters the main bag filter, the carbon black is filtered into the filter bag. The filter bag is periodically purged by the back blower in the main filter bag, so that the powdered carbon black falls into the storage hopper for collection and the recovered tail gas is obtained.

[0030] S40: The powdered carbon black is pickled using an acid pickling solution to obtain first-stage carbon black powder. The first-stage carbon black powder is then washed with water to obtain second-stage carbon black powder. The second-stage carbon black powder is placed in a plasma reactor, and a strong bonding layer, a flexible transition layer, and a functional regulation layer are sequentially deposited on the surface of the second-stage carbon black powder to obtain modified carbon black powder. The modified carbon black powder is adapted to a rubber matrix. The modified carbon black powder is prepared into sCB carbon black, and the sCB carbon black is dried using the recovered tail gas. In this embodiment, the pickling solution is a nitric acid solution with a concentration of 5% to 15%. The powdered carbon black is mixed with the pickling solution and stirred at 60°C to 80°C for 30 to 90 minutes. Solid-liquid separation is then performed to obtain the first-stage carbon black powder. The first-stage carbon black powder is washed with deionized water until the filtrate is neutral. The first-stage carbon black powder is then dried to obtain the second-stage carbon black powder. The pickling process removes inorganic impurities (i.e., ash) such as metal oxides from the surface of the powdered carbon black, preventing excessive ash content from causing poor compatibility with rubber molecular chains, creating interfacial weak points that lead to stress concentration and performance degradation.

[0031] After the second-stage carbon black powder is placed in the plasma reactor, the reactor is evacuated to below 10 Pa, argon gas is introduced to stabilize the pressure inside the reactor, the radio frequency power supply is turned on, and the process is carried out at a power of 50W~100W for 5min~15min to complete the surface cleaning and activation of the second-stage carbon black powder.

[0032] Step S40 includes: S410: A first mixed gas, including acrylic monomer vapor and argon, is introduced into the plasma reactor to form a strong bonding layer on the surface of the carbon black powder in the second stage. A pulsed radio frequency plasma mode is used, with a first average power of 20W~60W and a first processing time of 10min~30min, to form the strong bonding layer. This strong bonding layer, rich in highly polar functional groups such as carboxyl groups (-COOH), can form strong chemical bonds (covalent / ionic bonds) with the rubber vulcanization system (such as peroxide radicals and metal oxides), actively providing a large number of stable chemical bonding sites to ensure sufficient tensile stress, tensile strength, and abrasion resistance.

[0033] S420: A second mixed gas, including hexamethyldisiloxane monomer vapor and argon, is introduced into the plasma reactor to form a flexible transition layer on the surface of the strongly bonded layer; Without disrupting the vacuum, the supply of acrylic monomer vapor is stopped and replaced with hexamethyldisiloxane monomer vapor. The process is switched to continuous wave radio frequency plasma mode, with a second average power of 80W~150W and a second processing time of 15min~40min, to form the flexible transition layer. This flexible transition layer, primarily composed of compliant Si-O-Si chains, effectively absorbs and disperses stress transmitted from the rubber matrix to the filler interface, preventing microcrack propagation, enhancing tear resistance and dynamic fatigue performance, and ensuring the interface remains intact under repeated deformation.

[0034] S430: A third mixed gas, including perfluorooctane monomer vapor and argon, is introduced into the plasma reactor to form a functional control layer on the surface of the flexible transition layer. Maintaining a vacuum, the flow of hexamethyldisiloxane monomer vapor is stopped, and the flow is switched to perfluorooctane monomer vapor. A continuous wave radio frequency plasma mode is used, with a third average power of 10W~40W and a third processing time of 5min~20min to form the functional control layer. By setting the functional control layer, the interaction force between the sCB carbon black and rubber molecular chains can be controlled, promoting the dispersion of carbon black in rubber and inhibiting its agglomeration, thereby reducing the mixing viscosity. Simultaneously, the frictional energy consumption when rubber molecular chains slide on the filler surface can be reduced, significantly reducing dynamic heat generation and hysteresis loss. In other words, by surface modifying the powdered carbon black, a functional interface adapted to the rubber matrix is ​​constructed on its surface to compensate for the inherent defects of the powdered carbon black. Based on the aforementioned oil separation, the finished product quality of the sCB carbon black is further improved, enabling it to meet the quality requirements of tire reinforcement fillers.

[0035] S440: The modified carbon black powder, granulation water and basic binder are mixed to form a carbon black paste; In this embodiment, the base binder is 20% molasses. The modified carbon black powder, the granulation water, and the base binder are fed into a granulator to form a moist carbon black paste; S450: Add reinforcing additives to the carbon black paste and stir to obtain a mixed paste, and prepare the mixed paste as sCB carbon black; In a viscous state, adding the reinforcing additive allows for uniform mixing and tight bonding between the additive and the carbon black paste. In this embodiment, the reinforcing additive is a vulcanization accelerator. Wet granulation is commonly used and will not be elaborated upon here. By adding the reinforcing additive, the sCB carbon black is pre-compounded with the additives required for subsequent rubber processing. This simplifies the processing flow when used as a tire reinforcing filler, resulting in superior reinforcing effects and lower heat generation.

[0036] In this embodiment, the recovered tail gas is divided into a first tail gas and a second tail gas, with a ratio of 1:4. The first tail gas is sent to a drying furnace to dry the sCB carbon black. The second tail gas is purified and dehydrated (to lower the dew point, prevent corrosion, and improve combustion efficiency) before being transferred to the tail gas preheater to form the auxiliary combustion air. By performing multi-stage heat exchange and using the recovered tail gas for production and drying of the sCB carbon black, the internal energy circulation system is further improved, achieving complete internal consumption of combustible components, significantly reducing external fuel demand, and significantly reducing system carbon emissions.

[0037] Example 2 of this invention provides a method for preparing sustainable carbon black, which differs from the sustainable carbon black described in Example 1 in that... The second preset temperature is 220℃.

[0038] Example 3 of this invention provides a method for preparing sustainable carbon black, which differs from the sustainable carbon black described in Example 1 in that... The second preset temperature is 300℃.

[0039] Example 4 of this invention provides a method for preparing sustainable carbon black, which differs from the sustainable carbon black described in Example 1 in that... The temperature of the high-temperature airflow is 1900℃.

[0040] Example 5 of this invention provides a method for preparing sustainable carbon black, which differs from the sustainable carbon black described in Example 1 in that... The temperature of the high-temperature airflow is 2100℃.

[0041] Comparative Example 1 of this invention provides a method for preparing sustainable carbon black, which differs from the sustainable carbon black described in Example 1 in that... The second preset temperature is 180℃.

[0042] Comparative Example 2 of this invention provides a method for preparing sustainable carbon black, which differs from the sustainable carbon black described in Example 1 in that... The second preset temperature is 350℃.

[0043] Comparative Example 3 of this invention provides a method for preparing sustainable carbon black, which differs from the sustainable carbon black described in Example 1 in that... The temperature of the high-temperature airflow is 1800℃.

[0044] Comparative Example 4 of this invention provides a method for preparing sustainable carbon black, which differs from the sustainable carbon black described in Example 1 in that... The temperature of the high-temperature airflow is 2200℃.

[0045] Comparative Example 5 of this invention provides a method for preparing sustainable carbon black, which differs from the sustainable carbon black described in Example 1 in that... The heavy TPO feedstock oil is heated to a second preset temperature and injected into the throat section of the reactor to generate high-temperature carbon black-containing flue gas. That is, no catalyst was added in this comparative example.

[0046] Comparative Example 6 of this invention provides a method for preparing sustainable carbon black, which differs from the sustainable carbon black described in Example 1 in that... The powdered carbon black was prepared as sCB carbon black. That is, in this comparative example, the powdered carbon black was not subjected to surface modification treatment.

[0047] sCB carbon black was prepared according to the sustainable carbon black preparation method described in Examples 1 to 5 and Comparative Examples 1 to 6 of the present invention, and its index was tested. The results are shown in Table 1 below: Table 1 , As shown in the table above, by controlling the process parameters during the preparation process, the quality of the obtained sCB carbon black can be ensured to reach the optimal level. Comparative Example 6 also shows that, compared to carbon black obtained by directly pyrolyzing tires, the ash content of the waste tire pyrolysis oil obtained in this application is significantly reduced. Improper preheating temperature will affect the atomization and pyrolysis efficiency of the feedstock oil, leading to increased ash content, insufficient structure, and insufficient surface activity; too low a pyrolysis temperature will result in incomplete reaction, while too high a pyrolysis temperature may lead to over-pyrolysis or coking; the addition of a catalyst can optimize the carbon black structure and help improve the quality of the finished product; and the surface modification treatment of the powdered carbon black can effectively improve its inherent defects, ensuring that it meets the quality requirements of tire reinforcement fillers.

[0048] Secondly, Embodiment 6 of the present invention provides a sustainable carbon black, which is prepared by the sustainable carbon black preparation method as described in any one of Embodiments 1 to 5 above.

[0049] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., 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, the 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.

[0050] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. 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 modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A method for preparing sustainable carbon black, characterized in that, Includes the following steps: Waste tire pyrolysis oil is precisely filtered to obtain filtered pyrolysis oil. The filtered pyrolysis oil is heated to a first preset temperature and then fed into a distillation system to obtain light TPO fuel oil and heavy TPO feedstock oil. The light TPO fuel oil is mixed and burned with the first preheated air in the combustion section of the reactor to generate a high-temperature gas flow. The heavy TPO feedstock oil is heated to a second preset temperature and mixed with the catalyst before being injected into the throat section of the reactor. High-temperature carbon black flue gas is generated based on the high-temperature gas flow. The high-temperature carbon black-containing flue gas is cooled and subjected to multi-stage heat exchange to obtain carbon black-containing cooled flue gas. The carbon black-containing cooled flue gas is then fed into the main bag filter to obtain powdered carbon black and recovered tail gas. The powdered carbon black is acid-washed with an acid washing solution to obtain first-stage carbon black powder. The first-stage carbon black powder is then washed with water to obtain second-stage carbon black powder. The second-stage carbon black powder is placed in a plasma reactor, and a strong bonding layer, a flexible transition layer, and a functional regulation layer are sequentially deposited on the surface of the second-stage carbon black powder to obtain modified carbon black powder. The modified carbon black powder is adapted to a rubber matrix and is prepared into sCB carbon black. The sCB carbon black is then dried using the recovered tail gas.

2. The method for preparing sustainable carbon black according to claim 1, characterized in that, The distillation system includes a first distillation column and a second distillation column. The step of feeding the filtered cracked oil into the distillation system to obtain light TPO fuel oil and heavy TPO feedstock includes: The filtered cracked oil is fed into the first distillation column, and light TPO fuel oil is obtained from the top of the first distillation column, and heavy oil is obtained from the bottom of the first distillation column. The first bottom heavy oil is fed into the second distillation column, the top essential oil is obtained from the top of the second distillation column, and the second bottom heavy oil is obtained from the bottom of the second distillation column. The top essential oil and the filtered second bottom heavy oil are mixed to form heavy TPO feedstock oil.

3. The method for preparing sustainable carbon black according to claim 2, characterized in that, The first preset temperature is 130℃~150℃, and the temperature at the bottom of the second distillation column is 175℃~195℃.

4. The method for preparing sustainable carbon black according to claim 1, characterized in that, The temperature of the first preheated air is 900℃~1000℃, the second preset temperature is 220℃~300℃, and the temperature of the high-temperature airflow is 1900℃~2100℃.

5. The method for preparing sustainable carbon black according to claim 1, characterized in that, The step of cooling the high-temperature carbon black-containing flue gas and performing multi-stage heat exchange to obtain cooled carbon black-containing flue gas includes: First quench water is injected into the primary quenching section of the reactor to cool the high-temperature carbon black-containing flue gas to a third preset temperature and form a first cooling gas. The first cooling gas is input into the air preheater to heat the first air in the air preheater into the second preheated air, and to cool the first cooling gas in the air preheater into the second cooling gas. The second preheated air is then transferred to the combustion section of the reactor. The second cooling gas is input into the exhaust gas preheater to heat the second air in the exhaust gas preheater into auxiliary combustion air, and to cool the second cooling gas in the exhaust gas preheater into a third cooling gas, and then the auxiliary combustion air is transmitted to the combustion section of the reactor. The third cooling gas is input into the feedstock preheater used to store the heavy TPO feedstock oil to heat the heavy TPO feedstock oil and cool the third cooling gas in the feedstock preheater into a fourth cooling gas. The fourth cooling gas is input into the secondary quenching section, and the fourth cooling gas is cooled to the fourth preset temperature by the second quenching water, forming carbon black-containing cooling flue gas.

6. The method for preparing sustainable carbon black according to claim 5, characterized in that, The third preset temperature is 950℃~1000℃, and the fourth preset temperature is 240℃~280℃.

7. The method for preparing sustainable carbon black according to claim 1, characterized in that, The step of sequentially depositing a strong bonding layer, a flexible transition layer, and a functional regulation layer on the surface of the carbon black powder in the second stage includes: A first mixed gas, comprising acrylic monomer vapor and argon, is introduced into the plasma reactor to form a strong bonding layer on the surface of the carbon black powder in the second stage. A second mixed gas, comprising hexamethyldisiloxane monomer vapor and argon, is introduced into the plasma reactor to form a flexible transition layer on the surface of the strongly bonded layer. A third mixed gas, comprising perfluorooctane monomer vapor and argon, is introduced into the plasma reactor to form a functional control layer on the surface of the flexible transition layer.

8. The method for preparing sustainable carbon black according to claim 1, characterized in that, The specific steps for preparing the modified carbon black powder into sCB carbon black are as follows: The modified carbon black powder, granulation water, and basic binder are mixed to form a carbon black paste; A reinforcing additive is added to the carbon black paste and stirred to obtain a mixed paste, which is then prepared as sCB carbon black.

9. A sustainable carbon black, characterized in that, The sustainable carbon black is prepared by the method for preparing sustainable carbon black as described in any one of claims 1 to 8.

Images