Method and system for producing conductive carbon black from waste tire pyrolysis oil

Abstract

The invention relates to a method and system for producing conductive carbon black from waste tire pyrolysis oil, and the method comprises the following steps: the waste tire pyrolysis oil and carrier gas respectively enter a pyrolysis reactor which is heated to a reaction temperature through an electromagnetic induction coil, and are subjected to a pyrolysis reaction under an anaerobic condition, and the obtained reaction product is quenched by a quenching medium; and carrying out gas-solid separation to obtain a product containing the conductive carbon black. According to the method, efficient utilization of the waste tire pyrolysis oil is facilitated, high-performance carbon black can be prepared, the carbon black prepared through the method has good conductivity, and the value of the waste tire pyrolysis oil is increased.

Description

Technical Field

[0001] The invention relates to the field of petrochemicals, and in particular to a method and system for producing conductive carbon black from waste tire pyrolysis oil. Background Art

[0002] In my country, due to the reduction of crude oil reserves and the gradual strengthening of environmental awareness, the availability of inferior oil and the increase in processing profits have reduced the market share of low-quality gasoline and diesel. At the same time, the demand for high-quality gasoline has gradually increased. The slowdown in economic growth has led to a structural surplus of diesel, and the market share of diesel has gradually decreased. However, the vacancies of chemical raw materials such as low-carbon olefins and aromatics still need to be supplemented to achieve the transformation of refining and further development. Therefore, it is necessary to develop high-temperature cracking technology for producing chemical materials from inferior heavy oil, so as to achieve a successful transformation from oil to chemical.

[0003] The microstructure of carbon black is a unit composed of a continuous network of one or more concentrically oriented graphite plane layers around the crystal nucleus. The orientation of the graphite layer from one particle to the adjacent particle is consistent with the shape of the carbon black unit, while the graphite layer in the crystal nucleus is randomly oriented. Each aggregate has its own unique shape, which is anisotropic and irregular. The order of the carbon black unit is between that of crystalline and amorphous carbon, and is considered a quasi-crystal of graphite. In carbon black, each carbon atom in the graphite layer forms three equidistant bonds with three adjacent carbon atoms through sp2 hybrid orbitals. The sp2 orbital that does not participate in hybridization also has a lone electron, which is perpendicular to the direction of the graphite layer. The lone electrons of the sp2 orbital of each carbon atom overlap with each other to form a delocalized π bond. These delocalized electrons move freely in the entire carbon atom plane, resulting in good conductivity of graphite in the direction parallel to the sheet, that is, carbon black itself is a semiconductor. Conductive carbon black is a type of carbon black that optimizes the conductivity of carbon black.

[0004] Conductive carbon black is generally obtained by producing carbon black as a byproduct of acetylene from natural gas. The main reaction process is that the raw natural gas and oxygen are heated to a certain temperature in the gas preheater and then mixed into the reactor. A part of the natural gas is burned to provide heat energy for the reaction, and the other part of the natural gas undergoes cracking reaction at about 1500℃ to produce acetylene. Acetylene is easily decomposed into carbon black and hydrogen at high temperatures, so the optimal reaction time at high temperatures is only a few thousandths of a second, and the reaction is terminated by quenching with water spray. Although the reaction time is extremely short, carbon black is still generated. Carbon black is a byproduct in this process.

[0005] CN110204930B A production method and feeding equipment for controlling the specific surface area of ​​conductive carbon black, belonging to the technical field of conductive carbon black preparation. The production method for controlling the specific surface area of ​​conductive carbon black includes subjecting mixed acetylene and hydrocarbon raw materials to cracking reaction at 1300-1500°C; the hydrocarbon raw materials include one or more combinations of hydrocarbon compounds. The specific surface area of ​​the conductive carbon black obtained by introducing acetylene for cracking reaction at 1800°C is generally 80m 2 / g or more. CN107384458A The present invention discloses a high-temperature pyrolysis reactor, comprising a reactor body, a rubber powder spray pipe, a nozzle, a mixer, a cooling device, a quenching gas nozzle, etc. The present invention also discloses a system for pyrolyzing waste tires to produce oil and carbon black, which uses the high-temperature pyrolysis reactor, and also includes a waste tire crushing system, a conveying system, a fly ash filter, an absorption cooling tower, a carbon black collection system, an oil and gas cooling and separation system, and an exhaust gas recovery system. The present invention also discloses a method for pyrolyzing waste tires to produce oil and carbon black, which uses the system for pyrolyzing waste tires to produce oil and carbon black. The present invention adopts a high-temperature jet mixing and rapid pyrolysis method to achieve full mixing and pyrolysis of waste tire powder, and has the characteristics of simple process, compact equipment structure, low investment, and good oil quality. CN109135349A The present invention provides a method for producing high-purity conductive carbon black. The method selects anthracene oil as the raw oil for the production of conductive carbon black. When the anthracene oil is heated and distilled, the amount distilled out at 360°C is greater than 68%, and the amount distilled out before 300°C is less than 10%. In a multi-stage reactor, the temperature of the reactor's reaction section is maintained at 1700°C to 1760°C to generate carbon black; pure soft water is used as process quenching water to terminate the carbon black cracking reaction, and as secondary quenching water to obtain high-purity powdered carbon black without impurities; pure soft water is used as granulation water and a binder to be mixed in a static mixer, and the high-purity powdered carbon black without impurities is mixed with granulation water and a binder in a granulator for granulation, and a small amount of diesel is added as a granulation aid during the granulation process to obtain high-purity conductive carbon black particles. The granulated product produced by the method of the present invention has high dispersibility, low resistance, stable structural performance, high purity, and uniform particles, which are convenient for customers to produce and process.

[0006] The main methods for treating waste plastics are landfill, incineration, recycling and oilification. Landfill is a common method for treating solid waste, but this method has been gradually eliminated because waste plastics cause soil compaction and waste land resources; incineration can convert waste plastics into heat energy for heating, power generation, etc., which is a more efficient treatment method, but the dioxins produced during the incineration process will cause secondary pollution to the environment and release a large amount of CO2, which is not suitable for the "carbon reduction" goal of today's society; recycling is to clean the waste plastics and then granulate and melt them for reuse, but the quality of the composite recycled plastics obtained by recycling is generally poor and the economic efficiency is low; oilification is to convert waste plastics into fuel oil or chemicals by pyrolysis or catalytic cracking, which can alleviate the current social energy shortage problem and significantly reduce carbon emissions. It has high economic benefits and is the best choice for reducing the amount of waste plastics in urban garbage and recycling resources. Waste tire pyrolysis oil is generally used to produce fuel oil or chemicals, but it is highly toxic to catalysts during the production process.

[0007] The quality requirements of the carbon black industry for raw oil are: high aromatic content, relevant index (BMCI) ≥ 120, less impurities, asphalt and colloid. Generally speaking, anthracene oil, anti-corrosion oil and ethylene tar are ideal raw materials for carbon black production. At present, the raw material for producing carbon black for rubber generally uses a mixture of coal tar and anthracene oil. The purpose of increasing the proportion of anthracene oil in coal tar is to improve the coloring strength of carbon black. Anthracene oil is part of the composition of coal tar and can be obtained by distillation. The price of anthracene oil is higher than that of coal tar. The increase in the proportion of anthracene oil in carbon black raw materials will undoubtedly increase the production cost. Therefore, finding cheap raw materials for carbon black production and reducing the cost of carbon black production are the current priorities of the carbon black industry. Summary of the invention

[0008] The purpose of the present invention is to provide a method for producing conductive carbon black by utilizing waste tire pyrolysis oil.

[0009] A first aspect of the present invention provides a method for producing conductive carbon black from waste tire pyrolysis oil, comprising:

[0010] The waste tire pyrolysis oil and the carrier gas are respectively fed into a pyrolysis reactor heated to a reaction temperature by an electromagnetic induction coil to undergo pyrolysis reaction under anaerobic conditions. The obtained reaction product is quenched by a quenching medium and then subjected to gas-solid separation to obtain a product containing conductive carbon black.

[0011] Wherein, the reaction temperature of the cracking reactor is 1000-2500°C, preferably 1300-2000°C;

[0012] The reaction time is 2 milliseconds to 500 milliseconds, preferably 5 milliseconds to 50 milliseconds;

[0013] The cooling rate of the reaction product during rapid cooling is 50-1000°C / millisecond, preferably 50-500°C / millisecond; and / or

[0014] The temperature of the reaction product after rapid cooling is 100-900°C, preferably 200-500°C;

[0015] More preferably, the waste tire pyrolysis oil and the carrier gas enter the pyrolysis reactor in a tangential direction.

[0016] According to the method of the first aspect, the carrier gas is an inert gas selected from one or more of the following: nitrogen, helium, and argon.

[0017] According to the method of the first aspect, the quenching medium is selected from one or more of the following: water, nitrogen, argon; preferably soft water.

[0018] According to the method of the first aspect, the feed ratio of the carrier gas to the cracking raw material per unit time is 5-200 liters / gram, preferably 5-80 liters / gram.

[0019] According to the method of the first aspect, the waste tire pyrolysis oil and the carrier gas are respectively preheated and then enter the pyrolysis reactor;

[0020] Preferably, the carrier gas enters the cracking reactor after being preheated twice.

[0021] According to the method of the first aspect, the preheating temperature of the waste tire pyrolysis oil is 200-600° C., preferably 230-250° C.; and / or

[0022] The preheating temperature of the carrier gas is 800-2500°C, preferably 1500-2300°C.

[0023] The second aspect of the present invention provides a system for producing conductive carbon black from waste tire pyrolysis oil, comprising:

[0024] Preheating unit, including

[0025] A waste tire pyrolysis oil preheating furnace, which is connected to a waste tire pyrolysis oil sampling pipeline and is used to preheat the raw material waste tire pyrolysis oil;

[0026] A carrier gas preheating furnace connected to a carrier gas sampling pipeline; preferably, the preheating unit comprises two or more carrier gas preheating furnaces arranged in series, more preferably two;

[0027] A pyrolysis reactor is provided with a waste tire pyrolysis oil inlet, a carrier gas inlet and a reaction product outlet, and the pyrolysis reactor is respectively connected to the waste tire pyrolysis oil preheating furnace and the carrier gas preheating furnace of the preheating unit;

[0028] Product collection unit, including

[0029] A carbon black collector, which is provided with a reaction product inlet, a quenching medium inlet and a gas outlet, wherein the reaction product inlet of the carbon black collector is connected to the reaction product outlet of the cracking reactor, and the quenching medium inlet is arranged at the bottom of the carbon black collector;

[0030] A gas washing and carbon black filter connected to the gas outlet of the carbon black collector for washing gas products and filtering carbon black; preferably, the product collection unit comprises two or more gas washing and carbon black filters, more preferably two;

[0031] A gas collector is connected to the gas stripping washing and carbon black filter and is used to collect the gas product after washing and filtering.

[0032] According to the system of the second aspect, the cleavage reactor is a tubular reactor; preferably, the reactor is a horizontal reactor.

[0033] According to the system of the second aspect, the cracking reactor comprises a quartz outer tube and a graphite inner tube, the outer periphery of the quartz outer tube is sheathed with an electromagnetic induction coil for heating, and the electromagnetic induction coil is connected to a high-frequency electric induction heating device.

[0034] Compared with the prior art, the method of the present invention has the following beneficial effects:

[0035] (1) The electromagnetic induction coil heats the cracking reactor, which can achieve rapid temperature rise of the cracking reactor, and the reaction temperature control is simple and the operation is stable;

[0036] (2) It can provide a new way to utilize waste tire pyrolysis oil and solve the high-value recycling of waste tire pyrolysis oil;

[0037] (3) The method for producing carbon black of the present invention can prepare conductive carbon black simultaneously in a simple and efficient manner, and the yield of carbon black is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention but do not constitute a limitation of the present invention. In the accompanying drawings:

[0039] Figure 1 The present invention shows a flow chart of a specific embodiment of the method for producing conductive carbon black by using waste tire pyrolysis oil, and also includes a structural chart of a specific embodiment of the method for producing conductive carbon black by using waste tire pyrolysis oil.

[0040] Figure 2 The TEM image of the conductive carbon black prepared in Example 1 is shown.

[0041] Figure 3 The test results of the battery capacity of the conductive carbon black prepared in Example 1 as a conductive agent for lithium batteries are shown.

[0042] Figure 4 The first charge and discharge performance test results of the conductive carbon black LFP / HCB prepared in Example 1 are shown.

[0043] Description of reference numerals:

[0044] 1. Waste tire pyrolysis oil sampling pipeline; 2. Carrier gas sampling pipeline; 3-4, pipeline; 5, quenching medium inlet; 6-9, pipeline; 10, first preheating furnace; 11, second preheating furnace; 12, pyrolysis reactor; 13, carbon black collection tank; 14, gas washing and carbon black filter I; 15, gas washing and carbon black filter II; 16, gas collector. DETAILED DESCRIPTION

[0045] The present application is further described in detail below through the accompanying drawings and embodiments. Through these descriptions, the characteristics and advantages of the present application will become clearer and more specific.

[0046] The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration." Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. Although various aspects of the embodiments are shown in the drawings, the drawings are not necessarily drawn to scale unless otherwise noted.

[0047] In addition, the technical features involved in different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0048] The soft water described in this application is water with a calcium and magnesium ion content of 0-60 ppm.

[0049] The present invention provides a method for producing conductive carbon black from waste tire pyrolysis oil, comprising:

[0050] The waste tire pyrolysis oil and the carrier gas are respectively fed into a pyrolysis reactor heated to a reaction temperature by an electromagnetic induction coil to undergo pyrolysis reaction under anaerobic conditions. The obtained reaction product is quenched by a quenching medium and then subjected to gas-solid separation to obtain a product containing conductive carbon black.

[0051] Wherein, the reaction temperature of the cracking reactor is 1000-2500°C, preferably 1300-2000°C;

[0052] The reaction time is 2 milliseconds to 500 milliseconds, preferably 5 milliseconds to 50 milliseconds;

[0053] The cooling rate of the reaction product during rapid cooling is 50-1000°C / millisecond, preferably 50-500°C / millisecond; and / or

[0054] The temperature of the reaction product after rapid cooling is 100-900°C, preferably 200-500°C;

[0055] More preferably, the waste tire pyrolysis oil and the carrier gas enter the pyrolysis reactor in a tangential direction. The tangential injection of the raw material and the carrier gas can improve the dispersion of the raw material, improve the atomization effect, and be more conducive to uniform heating of the raw material.

[0056] The present invention provides a method for producing conductive carbon black, the method comprising:

[0057] First, the electromagnetic induction heating cracking reactor is heated under inert atmosphere. When the temperature reaches the preset reaction temperature, the waste tire cracking oil raw material is introduced to make the waste tire cracking oil raw material undergo high-temperature cracking reaction under oxygen-free conditions. By controlling the reaction time, product cooling and gas-solid separation, a conductive carbon black product and a gas product are obtained. The obtained reaction product is rapidly cooled and gas-solid separated by a quenching medium to obtain a gas product and a conductive carbon black product.

[0058] Waste tire pyrolysis oil has a high aromatic content and is suitable for preparing carbon materials. According to the characteristics of waste tire pyrolysis oil, the present invention designs a high-temperature pyrolysis method and system, and successfully prepares conductive carbon black by refining the pretreatment process, solving the high-value recycling of waste tire pyrolysis oil.

[0059] The present invention adopts electromagnetic induction heating pyrolysis reactor, which can realize rapid temperature rise of pyrolysis reactor and stable temperature. Compared with plasma reactor, the equipment is simpler, smaller in size, and easy to implement and operate. The present invention combines the technical scheme of electromagnetic induction heating pyrolysis reactor for pyrolysis reaction with controlling the temperature drop rate of rapid cooling within a specific range, so as to produce more high-quality conductive carbon black.

[0060] In one embodiment, the carrier gas is an inert gas selected from one or more of the following: nitrogen, helium, and argon.

[0061] According to the present invention, the carrier gas is used to control the reaction time on the one hand so that the cracking raw materials can pass through the cracking reactor quickly, and on the other hand to provide a high-temperature reaction gas environment for raw material cracking. The carrier gas can be selected from one or more of nitrogen, helium, and argon.

[0062] In one embodiment, the quenching medium is selected from one or more of the following: water, nitrogen, argon; preferably soft water.

[0063] According to the present invention, rapid cooling is used to quickly cool the reaction products to terminate the reaction and generate products with a specific composition. The rapid cooling medium used is well known to those skilled in the art, for example, one or more selected from water, nitrogen and argon, wherein the nitrogen can be liquid nitrogen.

[0064] In a specific embodiment, the cooling rate of the reaction product during rapid cooling is 50-1000° C. / millisecond, and the temperature of the reaction product after rapid cooling is 100-900° C. Rapid cooling under the above conditions can obtain a higher product yield.

[0065] In one embodiment, the feed ratio of the carrier gas to the cracking raw material per unit time is 5-200 liters / gram, preferably 5-80 liters / gram.

[0066] In one embodiment, the waste tire pyrolysis oil and the carrier gas are respectively preheated and then enter the pyrolysis reactor;

[0067] Preferably, the carrier gas enters the cracking reactor after being preheated twice.

[0068] In one embodiment, the preheating temperature of the waste tire pyrolysis oil is 200-600° C., preferably 230-250° C.; and / or

[0069] The preheating temperature of the carrier gas is 800-2500°C, preferably 1500-2300°C.

[0070] According to the present invention, the method of the present invention may further include: preheating the waste tire pyrolysis oil and the carrier gas before feeding them into the pyrolysis reactor, so that the waste tire pyrolysis oil and the carrier gas quickly reach the reaction temperature in the pyrolysis reactor. The temperature of the preheated waste tire pyrolysis oil and the carrier gas can vary within a large range.

[0071] The present invention also provides a system for producing conductive carbon black from waste tire pyrolysis oil, comprising:

[0072] Preheating unit, including

[0073] A waste tire pyrolysis oil preheating furnace, which is connected to a waste tire pyrolysis oil sampling pipeline and is used to preheat the raw material waste tire pyrolysis oil;

[0074] A carrier gas preheating furnace connected to a carrier gas sampling pipeline; preferably, the preheating unit comprises two or more carrier gas preheating furnaces arranged in series, more preferably two;

[0075] A pyrolysis reactor is provided with a waste tire pyrolysis oil inlet, a carrier gas inlet and a reaction product outlet, and the pyrolysis reactor is respectively connected to the waste tire pyrolysis oil preheating furnace and the carrier gas preheating furnace of the preheating unit;

[0076] Product collection unit, including

[0077] A carbon black collector, which is provided with a reaction product inlet, a quenching medium inlet and a gas outlet, wherein the reaction product inlet of the carbon black collector is connected to the reaction product outlet of the cracking reactor, and the quenching medium inlet is arranged at the bottom of the carbon black collector;

[0078] A gas washing and carbon black filter connected to the gas outlet of the carbon black collector for washing gas products and filtering carbon black; preferably, the product collection unit comprises two or more gas washing and carbon black filters, more preferably two;

[0079] A gas collector is connected to the gas stripping washing and carbon black filter and is used to collect the gas product after washing and filtering.

[0080] According to the present invention, the cracking reaction is completed at an ultra-high temperature and in an extremely short time. Compared with a plasma reactor, the cracking reactor of the present invention has a simple structure, an easy-to-control cracking process and low energy consumption.

[0081] According to the present invention, the pyrolysis reactor of the present invention is a reactor that can be heated by electromagnetic induction, for example, a quartz tubular reactor arranged horizontally. There is no specific restriction on the way of introducing the pyrolysis raw material and the carrier gas into the metal tubular reactor. The horizontal reactor is conducive to the full progress of the reaction and the formation of carbon black.

[0082] In a specific embodiment, the cracking feedstock and the carrier gas are introduced into the metal tubular reactor from the front of the metal tubular reactor, the reaction product is led out of the metal tubular reactor from the rear of the metal tubular reactor, and the quenching medium is introduced into the carbon black collector from the bottom of the carbon black collector.

[0083] According to the present invention, in order to enable the waste tire pyrolysis oil and the carrier gas to quickly reach the reaction temperature in the pyrolysis reactor, the system of the present invention may further include a first preheating furnace 10 and a second preheating furnace 11. The first preheating furnace 10 may be provided with a waste tire pyrolysis oil raw material inlet and a preheating material outlet, and the second preheating furnace 11 may be provided with a carrier gas inlet and a preheating material outlet. The preheating material outlet of the first preheating furnace 10 and the preheating material outlet of the second preheating furnace 11 may be connected to the raw material inlet of the pyrolysis reactor 12.

[0084] In one embodiment, the cleavage reactor is a tubular reactor.

[0085] In one embodiment, the cracking reactor comprises a quartz outer tube and a graphite inner tube, the outer periphery of the quartz outer tube is sheathed with an electromagnetic induction coil for heating, and the electromagnetic induction coil is connected to a high-frequency electric induction heating device.

[0086] In one embodiment, the high temperature cracking reactor is a tubular horizontal reactor.

[0087] In one embodiment, the carrier gas is preheated to 800-2000° C. in the reactor, and the waste tire pyrolysis oil passes through the oil inlet nozzle together with the atomizing gas and enters the reactor from the upper side of the reactor in a tangential direction to the carrier gas.

[0088] The present invention is further described below by means of specific implementation modes, but the present invention is not limited thereby.

[0089] In the embodiments and comparative examples:

[0090] The reaction temperature refers to the temperature in the middle of the reaction tube covered by the electromagnetic induction coil;

[0091] Product yield = product weight / cracking raw material weight × 100%;

[0092] The gaseous reaction products were determined by gas chromatography.

[0093] like Figure 1 As shown, the pyrolysis raw material waste tire pyrolysis oil preheated to 200-600°C and the carrier gas preheated to 500-2000°C by the first preheating furnace 10 and the second preheating furnace 11 in sequence enter the pyrolysis reactor 12 through the waste tire pyrolysis oil sampling pipeline 1 and the pipeline 4 respectively. The pyrolysis reactor 12 provides a high-temperature heat source through a high-frequency electric induction heating device and an electromagnetic induction coil to make the temperature of the pyrolysis reactor reach the reaction temperature of 1300-2000°C. The pyrolysis raw material entering the pyrolysis reactor 12 passes through the pyrolysis reactor 12 rapidly under the drive of the carrier gas and undergoes a pyrolysis reaction. The product enters the carbon black collection tank 13 containing a quenching medium nozzle. The quenching medium enters the carbon black collection tank 13 through the quenching medium inlet 5. The product is cooled to 200-500°C by rapid cooling (the cooling rate of the reaction product during rapid cooling is 100°C / millisecond). Among them, the gas product enters the gas washing and carbon black filter I14 and the gas washing and carbon black filter II15 in turn from the gas outlet of the carbon black collecting tank 13, and the gas product is further cooled and separated from the gas and solid, and the obtained product gas enters the gas collector 16 through the pipeline 9.

[0094] Example 1

[0095] This embodiment Figure 1In the system shown, waste tire pyrolysis oil with properties as described in Table 1 is used as the pyrolysis raw material, and the preheating temperature is 230°C; the carrier gas is nitrogen, and the preheating temperature is 1500°C. A quartz tube is used as a reactor, and the quartz tube is horizontally arranged along the length direction, with an inner diameter of 25mm and a length of 40mm. A graphite tube with three through holes is placed inside the quartz tube, and an electromagnetic induction coil is sleeved on the outer periphery of the quartz tube. The induction coil heats the reactor through the graphite tube. Soft water is introduced into the carbon black collecting tank 13 from the quenching medium inlet 5 at the bottom thereof as a quenching medium, and the flow rate of the soft water is 100ml / min. The cooling rate of the reaction product is controlled to be 100°C / millisecond, so that its temperature is reduced to about 250°C. The generated gas product enters the gas washing and carbon black filter I14 and the gas washing and carbon black filter II15 from the gas outlet of the carbon black collecting tank 13, and the obtained product gas enters the gas collector 16 through the pipeline 9. The obtained gas product mainly includes acetylene, hydrogen, methane and a small amount of ethylene. The carbon black product is separated and dried to obtain a conductive carbon black product. The quality of the waste tire pyrolysis oil is shown in Table 1.

[0096] The specific conditions of Example 1 are as follows: reaction temperature is 1400°C, nitrogen is used as carrier gas, carrier gas flow rate is 3L / min, feed rate is 0.48 g / min, oil feeding time is 1.5 minutes, reaction time is 26 milliseconds, cooling rate is 100°C / millisecond, product temperature is 250°C, the gas product yield is 10.35%, and the conductive carbon black yield is 89.65%. The conductive carbon black obtained in this example was analyzed, and the results are as follows: Figure 2-Figure 4 shown.

[0097] from Figure 2 It can be seen that the carbon black produced by the present invention is in the form of approximately spherical particles, a part of which is connected end to end to form a chain agglomerate, and the other part is overlapped; the particle size is generally less than 100nm; and the end to end is connected to form a chain aggregate.

[0098] Electrochemical performance test

[0099] The conductive carbon black prepared in Example 1 was assembled into a battery with lithium iron phosphate. The assembled battery was allowed to stand at 25°C for 5 hours before the electrochemical performance test was performed. In the experiment, the battery charge and discharge performance test was performed on a blue electric system with a test voltage of 2.0 to 3.9V. The test items were the battery's charge and discharge specific capacity, cycle performance, rate performance, etc. The battery's cyclic voltammetry test (CV) was performed on an electrochemical analyzer.

[0100] (1) Charge and discharge performance test

[0101] The test is mainly to obtain the battery's first charge and discharge, cycle stability and rate performance data. The test system used is the blue electric test system, the test conditions are 25℃, 2.0~3.9V, and the current density is 160mAh / g. Before the test, the assembled battery is left to stand at 25℃ for 5h before subsequent testing.

[0102] (2) Cyclic voltammetry (CV)

[0103] Cyclic voltammetry tests analyze the electrochemical performance of batteries by studying the redox process occurring on the electrodes. The test instrument used is Shanghai Chenhua CHI electrochemical analyzer, and the test conditions are: test temperature is room temperature, test voltage is 2.5~4V, and scan rate is 0.2mV / s.

[0104] from Figure 3 From the battery capacity test curve, when the rate increases from a small value, the discharge capacity slightly decays, and when the rate returns to the initial rate from a large value, the discharge capacity returns to the initial state, indicating that the battery capacity is good and relatively stable. Figure 4 It can be seen that the charge and discharge voltage platform stability of the prepared conductive carbon black is very good. Therefore, the method and system of the present invention can be used to prepare conductive carbon black.

[0105] Table 1 Raw material properties

[0106]

[0107]

[0108] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "install", "connect" and "connect" should be understood in a broad sense. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0109] The present application has been described above in conjunction with preferred embodiments, but these embodiments are only exemplary and serve only as an illustration. On this basis, various replacements and improvements may be made to the present application, all of which fall within the scope of protection of the present application.

Claims

1. A method for producing conductive carbon black from waste tire pyrolysis oil, comprising: The waste tire pyrolysis oil and the carrier gas are respectively fed into a pyrolysis reactor heated to a reaction temperature by an electromagnetic induction coil to undergo pyrolysis reaction under anaerobic conditions. The obtained reaction product is quenched by a quenching medium and then subjected to gas-solid separation to obtain a product containing conductive carbon black. Wherein, the reaction temperature of the cracking reactor is 1000-2500°C, preferably 1300-2000°C; The reaction time is 2 milliseconds to 500 milliseconds, preferably 5 milliseconds to 50 milliseconds; The cooling rate of the reaction product during rapid cooling is 50-1000°C / millisecond, preferably 50-500°C / millisecond; and / or The temperature of the reaction product after rapid cooling is 100-900°C, preferably 200-500°C; More preferably, the waste tire pyrolysis oil and the carrier gas enter the pyrolysis reactor in a tangential direction.

2. The method according to claim 1, characterized in that The carrier gas is an inert gas selected from one or more of the following: nitrogen, helium, and argon.

3. The method according to claim 1, characterized in that The quenching medium is selected from one or more of the following: water, nitrogen, argon; preferably soft water.

4. The method according to claim 1, characterized in that: The feed ratio of the carrier gas to the cracking raw material per unit time is 5-200 liters / gram, preferably 5-80 liters / gram.

5. The method according to any one of claims 1 to 4, characterized in that The waste tire pyrolysis oil and the carrier gas are respectively preheated and then enter into the pyrolysis reactor; Preferably, the carrier gas enters the cracking reactor after being preheated twice.

6. The method according to claim 5, characterized in that The preheating temperature of the waste tire pyrolysis oil is 200-600° C., preferably 230-250° C.; and / or The preheating temperature of the carrier gas is 800-2500°C, preferably 1500-2300°C.

7. A system for producing conductive carbon black from waste tire pyrolysis oil, comprising: Preheating unit, including A waste tire pyrolysis oil preheating furnace, which is connected to a waste tire pyrolysis oil sampling pipeline and is used to preheat the raw material waste tire pyrolysis oil; A carrier gas preheating furnace connected to a carrier gas sampling pipeline; preferably, the preheating unit comprises two or more carrier gas preheating furnaces arranged in series, more preferably two; A pyrolysis reactor is provided with a waste tire pyrolysis oil inlet, a carrier gas inlet and a reaction product outlet, and the pyrolysis reactor is respectively connected to the waste tire pyrolysis oil preheating furnace and the carrier gas preheating furnace of the preheating unit; Product collection unit, including A carbon black collector, which is provided with a reaction product inlet, a quenching medium inlet and a gas outlet, wherein the reaction product inlet of the carbon black collector is connected to the reaction product outlet of the cracking reactor, and the quenching medium inlet is arranged at the bottom of the carbon black collector; A gas washing and carbon black filter connected to the gas outlet of the carbon black collector for washing gas products and filtering carbon black; preferably, the product collection unit comprises two or more gas washing and carbon black filters, more preferably two; A gas collector is connected to the gas stripping washing and carbon black filter and is used to collect the gas product after washing and filtering.

8. The system according to claim 7, characterized in that The cleavage reactor is a tubular reactor; preferably, the cleavage reactor is a horizontal reactor.

9. The system according to claim 7 or 8, characterized in that: The cracking reactor comprises a quartz outer tube and a graphite inner tube. The outer periphery of the quartz outer tube is sheathed with an electromagnetic induction coil for heating, and the electromagnetic induction coil is connected to a high-frequency electric induction heating device.

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