Systems and methods for preparing liquid hydrocarbons from waste plastics

Abstract

This application relates to a method for preparing liquid hydrocarbons from waste plastics, comprising the following steps: S1: mixing waste plastics and a pyrolysis catalyst to obtain a first mixture; S2: subjecting the first mixture to a multi-stage pyrolysis reaction to obtain a first mixed oil-gas component and a first solid product; S3: separating the first mixed oil-gas component and the first solid product; S4: catalytically recombining the first mixed oil-gas component to obtain a second mixed oil-gas component; S5: fractionating and refining the second mixed oil-gas component to obtain gaseous hydrocarbons and liquid hydrocarbons. This application also relates to a system for preparing liquid hydrocarbons from waste plastics. This application solves the technological challenges of chemical recycling of waste plastics, enabling its catalytic conversion reaction to generate more industrial raw materials, addressing the environmental pollution caused by the incineration of waste plastics, and enhancing the utilization value of waste plastic cracking catalysts, bringing significant economic and social benefits to the petrochemical industry.

Description

Technical Field

[0001] This application relates to the field of waste treatment and chemical recycling of waste plastics, specifically to a system and method for preparing liquid hydrocarbons from waste plastics. Background Technology

[0002] my country's plastic market demand is increasing year by year, generating approximately 40 million tons of waste plastic annually, with a low recycling rate. Currently, waste plastic treatment methods are gradually shifting from landfill and incineration to resource utilization, primarily through physical and chemical recycling.

[0003] However, due to the complex composition and sources of waste plastics, they severely corrode equipment and cause significant environmental pollution during pyrolysis. Furthermore, the yield of plastic pyrolysis oil fluctuates greatly, its properties are unstable, and the content of impurities such as small-molecule organochlorines and organosilicones in the oil is thousands of times higher than that in petroleum products. Therefore, plastic oil cannot be used directly as a petrochemical product and requires further processing.

[0004] Therefore, there is a need in the art for a system and method for preparing liquid hydrocarbons from waste plastics. Summary of the Invention

[0005] The purpose of this application is to provide a method for preparing liquid hydrocarbons from waste plastics. Specifically, the method described herein includes subjecting the waste plastics to multi-stage pyrolysis to obtain a first mixed oil-gas component, then subjecting the first mixed oil-gas component to catalytic recombination to obtain a second mixed oil-gas component, followed by fractional distillation and purification to obtain C1-C4 gaseous hydrocarbons and C5 or higher liquid hydrocarbons. Preferably, the C1-C4 gaseous hydrocarbons can be subjected to a superposition reaction to obtain additional C5 or higher liquid hydrocarbons, thereby maximizing the yield of liquid hydrocarbons.

[0006] The purpose of this application is also to provide a system for preparing liquid hydrocarbons from waste plastics.

[0007] To address the aforementioned technical problems, this application provides the following technical solution.

[0008] In a first aspect, this application provides a method for preparing liquid hydrocarbons from waste plastics, comprising the following steps:

[0009] S1: Mix waste plastics and pyrolysis catalyst to obtain the first mixture;

[0010] S2: The first mixture is subjected to a multi-stage pyrolysis reaction to obtain a first mixed oil and gas component and a first solid product;

[0011] S3: Separate the first mixed oil and gas components and the first solid product;

[0012] S4: Catalytically recombine the first mixed oil and gas component to obtain a second mixed oil and gas component;

[0013] S5: The second mixed oil and gas components are fractionated and refined to obtain gaseous hydrocarbons with 4 or fewer carbon atoms and a first portion of liquid hydrocarbons, wherein the first portion of liquid hydrocarbons has 5 or more carbon atoms.

[0014] In a second aspect, this application provides a system for preparing liquid hydrocarbons from waste plastics, comprising: a mixing device for mixing waste plastics and a pyrolysis catalyst to obtain a first mixture; a first reaction device for pyrolyzing the first mixture to obtain a first mixed oil-gas component and a first solid product; a first separation device for separating the first mixed oil-gas component and the first solid product; a second reaction device for catalytically reforming the first mixed oil-gas component to obtain a second mixed oil-gas component; and a second separation device for fractionating and refining the second mixed oil-gas component to obtain gaseous hydrocarbons with 4 or fewer carbon atoms and a first portion of liquid hydrocarbons, wherein the first portion of liquid hydrocarbons has 5 or more carbon atoms.

[0015] Compared with existing technologies, the beneficial effects of this invention lie in its ability to efficiently convert waste plastics into oil and gas components through multi-stage pyrolysis reactions. After catalytic recombination reactions, gaseous and liquid hydrocarbons can be obtained. Furthermore, by subjecting the gaseous hydrocarbons to a superposition reaction, additional liquid hydrocarbons are obtained, thereby maximizing the yield of liquid hydrocarbons. This application solves the technological challenges of chemical recycling of waste plastics, enabling its catalytic conversion reactions to generate more industrial raw materials, addressing the environmental pollution caused by the incineration of waste plastics, and enhancing the utilization value of waste plastic cracking catalysts, bringing significant economic and social benefits to the petrochemical industry. Attached Figure Description

[0016] Figure 1 This illustrates a system for preparing lightweight, low-olefin plastic pyrolysis oil from waste plastics according to one embodiment.

[0017] In the accompanying drawings, the meanings of the various reference numerals are as follows:

[0018] 1. Mixing device; 2. First reaction device; 21. First-stage pyrolysis device; 22. Second-stage pyrolysis device; 23. Third-stage pyrolysis device; 3. First separation device; 4. Second reaction device; 5. Second separation device; 6. Third reaction device. Detailed Implementation

[0019] Where applicable, any patent, patent application, or disclosure relating to this application is incorporated herein by reference in its entirety, and its equivalent patent families are also incorporated herein by reference, particularly the definitions of catalysts, waste plastics, pyrolysis, etc., disclosed in such documents. If any definition of a specific term disclosed in the prior art is inconsistent with any definition provided herein, the definition provided herein shall prevail.

[0020] The terms “comprising,” “including,” “having,” and their derivatives do not exclude the presence of any other components, steps, or processes, regardless of whether such other components, steps, or processes are disclosed in this application. To eliminate any doubt, unless expressly stated otherwise, all compositions using the terms “comprising,” “including,” or “having” in this application may contain any additional additives, excipients, or compounds. Conversely, except for those necessary for operational performance, the term “substantially constitutes…” excludes any other components, steps, or processes described below with respect to that term. The term “consisting of…” does not include any components, steps, or processes not specifically described or listed. Unless expressly stated otherwise, the term “or” refers to the individual members listed or any combination thereof.

[0021] Terminology Definition

[0022] In this article, the term "plastic pyrolysis oil" refers to the liquid-phase product (at room temperature and pressure) generated from waste plastics through pyrolysis or catalytic pyrolysis.

[0023] In a first aspect, this application relates to a method for preparing liquid hydrocarbons from waste plastics. In one specific embodiment, the method described herein may include the following steps: S1: mixing waste plastics and a pyrolysis catalyst to obtain a first mixture; S2: subjecting the first mixture to a multi-stage pyrolysis reaction to obtain a first mixed oil-gas component and a first solid product; S3: separating the first mixed oil-gas component and the first solid product; S4: catalytically recombining the first mixed oil-gas component to obtain a second mixed oil-gas component; S5: fractionating and refining the second mixed oil-gas component to obtain gaseous hydrocarbons with 4 or fewer carbon atoms and a first portion of liquid hydrocarbons, wherein the first portion of liquid hydrocarbons has 5 or more carbon atoms. In this document, the liquid hydrocarbons may be further fractionated into components of different weights, or the mixed liquid hydrocarbons may be used directly as a product without fractionation.

[0024] Next, we will combine the attached Figure 1 Describe each specific step in detail.

[0025] In one specific implementation, reference is made to... Figure 1Step S1, mixing waste plastics and pyrolysis catalyst, can be carried out in mixing device 1. In one embodiment, the waste plastics and pyrolysis catalyst can be mixed without heating to obtain a first mixture, in which case the waste plastics remain in a solid state. In another embodiment, the waste plastics and pyrolysis catalyst can be mixed under heating conditions to melt the plastics, which are then conveyed to the first reaction device 2 via a discharge device. In one embodiment, in step S1, before mixing the waste plastics and pyrolysis catalyst, the waste plastics can be pretreated to make the size of the pretreated waste plastics range from about 0.1 to 20 cm. The waste plastics can contain various components such as PP, PE, PET, PVC, PS, and nylon. The mixing of waste plastics and pyrolysis catalyst can also be carried out using other equipment and techniques known in the art. The first mixture can be conveyed to the downstream first reactor 2 via a discharge unit. In a specific embodiment, the discharge unit can be a melt extruder or an extrusion friction machine.

[0026] In one embodiment, step S2 can be implemented using a first reaction device 2 to obtain a first mixed oil and gas component and a first solid product. The first solid product may be coke. In a specific embodiment, in step S2, subjecting the first mixture to a multi-stage pyrolysis reaction includes subjecting the first mixture to a two-stage pyrolysis reaction sequentially, wherein the temperature of the first-stage pyrolysis reaction is 350-450°C, and the temperature of the second-stage pyrolysis reaction is 450-550°C. In a specific embodiment, in step S2, subjecting the first mixture to a multi-stage pyrolysis reaction includes subjecting the first mixture to a three-stage pyrolysis reaction sequentially, wherein the temperature of the first-stage pyrolysis reaction is 350-400°C, the temperature of the second-stage pyrolysis reaction is 400-450°C, and the temperature of the third-stage pyrolysis reaction is 450-550°C. It should be noted that, in order to further improve the pyrolysis efficiency of waste plastics, the first mixture may undergo four or more stages of pyrolysis reaction, and the temperature of the subsequent pyrolysis reaction is higher than the temperature of the earlier pyrolysis reaction.

[0027] In a preferred embodiment, reference Figure 1The multi-stage pyrolysis reaction of the first mixture includes sequentially performing a three-stage pyrolysis reaction in a primary pyrolysis unit 21, a secondary pyrolysis unit 22, and a tertiary pyrolysis unit 23. The temperatures of the primary, secondary, and tertiary pyrolysis units 21 and 23 gradually increase, and heating can be achieved using electric heating, external heating of molten salt, steam heating, or inert oil heating. In one specific embodiment, the first reactor 2 can be heated by circulating molten salt through a jacket around the pyrolysis unit. In this case, the molten salt inlet can be located around the tertiary pyrolysis unit 23, and the molten salt outlet can be located around the primary pyrolysis unit 21, allowing the molten salt to flow sequentially around the tertiary pyrolysis unit 23, the secondary pyrolysis unit 22, and the pyrolysis unit 21. In a preferred embodiment, an electric heating device can also be used to heat the tertiary pyrolysis unit 23, providing a higher reaction temperature and allowing the reaction in the tertiary pyrolysis unit 23 to proceed more thoroughly. The oil and gas components formed in the primary pyrolysis unit 21, secondary pyrolysis unit 22, and tertiary pyrolysis unit 23 are all transported to the first separation unit 3 to obtain the first mixed oil and gas component. The coke can be discharged from the system through the tertiary pyrolysis unit 23. It should be noted that some coke may be mixed with the oil and gas components formed in the primary, secondary, and tertiary pyrolysis units 21, 22, and 23 during transport; therefore, the first mixed oil and gas component and the coke need to be separated in subsequent steps.

[0028] In one embodiment, step S3 can be performed in the first separation device 3. In a specific embodiment, the first separation device 3 can be a container in which the first mixed oil-gas component and the first solid product can be cooled. Subsequently, the first mixed oil-gas component is sampled from the top of the first separation device 3, and the first solid product is separated from the bottom of the first separation device 3. The first solid product separated from the first separation device 3, i.e., coke, can be combined with the coke discharged from the three-stage pyrolysis device 23 and transported together to a downstream collection device or processing device.

[0029] In one embodiment, step S4 can be performed in the second reaction apparatus 4. Step S4 includes catalytic recombination of the first mixed oil and gas component to obtain a second mixed oil and gas component. In a specific embodiment, in step S4, catalytic recombination of the first mixed oil and gas component includes recombination of olefins and dienes in the first mixed oil and gas component to generate alkanes and aromatics, and / or, superposition of short-chain olefins into long-chain olefins. The main purpose of step S4 is to improve the yield of liquid hydrocarbons.

[0030] In one embodiment, step S5 can be performed in the second separation device 5. Specifically, the second mixed oil-gas component can be cooled in the second separation device 5 to obtain gaseous hydrocarbons with 4 or fewer carbon atoms and a first portion of liquid hydrocarbons with 5 or more carbon atoms. In a preferred embodiment, the temperature of the second separation device 5 is 30-50°C. At this temperature, C1-C4 hydrocarbons remain gaseous, while hydrocarbons with 5 or more carbon atoms become liquid.

[0031] Preferably, the method described herein further includes the following step: S7: after step S3 and before step S4, dust and impurities are removed from the first mixed oil and gas component. In one specific embodiment, step S7 and step S4 are performed in the same device. In other words, the dust and impurities removal device (not shown in the figure) for removing dust and impurities from the first mixed oil and gas component can be integrated with the second reaction device 4.

[0032] In this paper, impurities in the first mixed oil and gas component may include S, N, Si, halogens, ammonium salts, etc. Inorganic impurities can be removed by using adsorbents, dechlorinating agents, or demineralized water, while organic impurities can be removed by hydrogenation or adsorption.

[0033] In another embodiment, to further improve the yield of liquid hydrocarbons, the method described herein may further include: S6: subjecting the gaseous hydrocarbons to a superposition reaction to obtain a second portion of liquid hydrocarbons, wherein the second portion of liquid hydrocarbons has a carbon number greater than or equal to 5. Specifically, refer to... Figure 1 The gaseous hydrocarbons separated from the second separation device 5 can enter the third reaction device 6 for a superposition reaction to obtain additional liquid hydrocarbons, thereby maximizing the yield of liquid hydrocarbons. In one specific embodiment, the second portion of liquid hydrocarbons formed in the third reaction device 6 can be mixed with the first portion of liquid hydrocarbons separated in the second separation device 5, and then transported to a downstream collection device or processing device.

[0034] In a second aspect, this application provides a system for preparing liquid hydrocarbons from waste plastics, comprising a mixing device 1, a first reaction device 2, a first separation device 3, a second reaction device 4, and a second separation device 5 connected in sequence. The mixing device 1 is used to mix waste plastics and a pyrolysis catalyst to obtain a first mixture. The first reaction device 2 is used to pyrolyze the first mixture to obtain a first mixed oil-gas component and a first solid product. The first separation device 3 is used to separate the first mixed oil-gas component and the first solid product. The second reaction device 4 is used to catalytically recombine the first mixed oil-gas component to obtain a second mixed oil-gas component. The second separation device is used to fractionate and refine the second mixed oil-gas component to obtain gaseous hydrocarbons with 4 or fewer carbon atoms and a first portion of liquid hydrocarbons, wherein the first portion of liquid hydrocarbons has 5 or more carbon atoms. In one specific embodiment, the second reaction device 2 may include a multi-stage pyrolysis device. For example, the second separation device 2 may include a first-stage pyrolysis device 21, a second-stage pyrolysis device 22, and a third-stage pyrolysis device 23.

[0035] In one embodiment, the system described herein further includes a dust removal and impurity removal device for removing dust and impurities from the first mixed oil and gas components. This dust removal and impurity removal device is located downstream of the first separation device 3 and upstream of the second reaction device 4. In a specific embodiment, the dust removal and impurity removal device and the second reaction device 4 are integrated into one unit.

[0036] In other embodiments, the system described herein further includes a third reaction device 6 for performing a superposition reaction on gaseous hydrocarbons to obtain a second portion of liquid hydrocarbons having a carbon number greater than or equal to 5.

[0037] Figure 1 This paper illustrates a specific implementation of the system for preparing liquid hydrocarbons from waste plastics as described herein. The following will be discussed in conjunction with the appendix. Figure 1 This document describes in detail a specific operating method of a system for preparing liquid hydrocarbons from waste plastics. (Reference) Figure 1First, waste plastics and pyrolysis catalyst are added to mixing device 1 through waste plastic feed pipe 101 and pyrolysis catalyst feed pipe 102, respectively. Under heated or unheated conditions, the waste plastics and pyrolysis catalyst are mixed in mixing device 1 to obtain a first mixture. Subsequently, the first mixture is transported to primary pyrolysis device 21 through mixing device output pipe 103. In primary pyrolysis device 21, the first mixture undergoes catalytic pyrolysis. The resulting first portion of oil and gas is transported to primary separation device 3 through first output pipe 201, while the resulting solid products and unreacted waste plastics are transported to secondary pyrolysis device 22 through second output pipe 202. The unreacted waste plastics continue to react at a higher temperature in secondary pyrolysis device 22. The resulting second portion of oil and gas is transported to primary separation device 3 through third output pipe 203, while the resulting solid products and unreacted waste plastics are transported to tertiary pyrolysis device 23 through fourth output pipe 204. Unreacted waste plastics continue to react at a higher temperature in the three-stage pyrolysis unit 23. The resulting third part of oil and gas is transported to the first separation unit 3 through the fifth output pipe 205, while the resulting solid products and unreacted waste plastics are discharged from the system through the sixth output pipe 206.

[0038] The oil and gas generated by the various pyrolysis units in the second reaction unit 2 are mixed to obtain a first mixed oil and gas component. This first mixed oil and gas component can be separated in the first separation unit 3. The resulting gaseous oil and gas component can be transported to the second reaction unit 4 through the first mixed oil and gas component output pipe 301 after dust removal and impurity removal. The coke obtained from the separation in the first separation unit 3 can be discharged from the system through the first solid product output pipe 302.

[0039] The first mixed oil and gas component undergoes a catalytic recombination reaction in the second reaction unit 4 to obtain a second mixed oil and gas component, which is then transported to the second separation unit 5 through the second mixed oil and gas component output pipe 401. The second mixed oil and gas component is separated in the second separation unit to obtain gaseous hydrocarbons and a first portion of liquid hydrocarbons. The gaseous hydrocarbons can be transported to a downstream processing unit or collection unit through the gaseous hydrocarbon output pipe 501. The liquid hydrocarbons can be transported to a downstream processing unit or collection unit through the first liquid hydrocarbon output pipe 502.

[0040] In a preferred embodiment, the gaseous hydrocarbons can be transported to the third reaction device 6 and undergo a superposition reaction therein to obtain a second portion of liquid hydrocarbons. The second portion of liquid hydrocarbons can be transported to a downstream processing device or collection device through a second liquid hydrocarbon output pipe 601. In a specific embodiment, the first liquid hydrocarbon output pipe 502 can merge with the second liquid hydrocarbon output pipe 601 before being transported to a downstream processing device or collection device.

[0041] Example

[0042] The technical solution of this application will be clearly and completely described below with reference to the embodiments of this application. Unless otherwise specified, the reagents and raw materials used can be purchased commercially. Experimental methods in the following embodiments that do not specify specific conditions are performed according to conventional methods and conditions, or according to the product instructions.

[0043] Examples 1-5

[0044] Examples 1-5 involve the use of waste plastics to prepare liquid hydrocarbons.

[0045] The specific steps of Examples 1-5 are as follows.

[0046] Waste plastics and pyrolysis catalyst are added to mixing unit 1, and after mixing, a first mixture is obtained. Then, the first mixture is sequentially fed to a primary pyrolysis unit 21, a secondary pyrolysis unit 22, and a tertiary pyrolysis unit 23. Coke is collected from the tertiary pyrolysis unit 23, while the oil and gas formed in the three pyrolysis units are all fed to a first separation unit 3 to obtain a first mixed oil and gas component. After separating the first mixed oil and gas component from the coke, the first mixed oil and gas component is subjected to dust removal and impurity removal, and then fed to a second separation unit 4 for a catalytic recombination reaction to obtain a second mixed oil and gas component. The second mixed oil and gas component is fed to a second separation unit 5, where it is cooled and separated to obtain gaseous hydrocarbons and liquid hydrocarbons. The obtained gaseous hydrocarbons are further fed to a third reactor for a superposition reaction to obtain additional liquid hydrocarbons.

[0047] The waste plastic raw material components added in Examples 1-5 are shown in Table 1.

[0048] Table 1. Waste plastic components and their contents added in Examples 1-5

[0049]

[0050] The reaction conditions for each device in this embodiment are shown in Table 2.

[0051] Table 2. Reaction temperature and pressure of each device

[0052] Temperature / °C Pressure / MPa mixing device normal temperature Atmospheric pressure First reaction device 350-550 0-0.1 First separation device 450-550 0-0.1 Second reaction device 400±10 0-0.1 Second separation device 400±10 0-0.1 Third reaction device 50-550 0-0.1

[0053] The product types and yields of this embodiment are shown in Table 3.

[0054] Table 3 Product types and yields ((w / w)%)

[0055] Example number C1-C4 gaseous hydrocarbons Part One: Liquid Hydrocarbons Part Two: Liquid Hydrocarbons coke Example 1 5 82 7 6 Example 2 3 85 8 4 Example 3 6 81 5 8 Example 4 4 89 4 3 Example 5 8 83 5 4

[0056] In Table 3, yield refers to the mass fraction of each product in the total product. As shown in Table 3, the higher the content of PP, PE, and PS in waste plastics, the higher the yield of liquid products. Correspondingly, the higher the PS content, the higher the yield of gaseous products. The PET content is also directly proportional to the yield of coke.

[0057] The above description of the embodiments is intended to enable those skilled in the art to understand and apply this application. It will be apparent to those skilled in the art that various modifications can be easily made to these embodiments, and the general principles described herein can be applied to other embodiments without creative effort. Therefore, this application is not limited to the embodiments described herein, and any improvements and modifications made by those skilled in the art based on the disclosure of this application without departing from the scope and spirit of this application are within the scope of this application.

Claims

1. A method for preparing liquid hydrocarbons from waste plastics, characterized in that, The method includes the following steps: S1: Mix waste plastics and pyrolysis catalyst to obtain a first mixture; the waste plastics include PP, PE, PET, PVC, PS and nylon; S2: The first mixture is subjected to a multi-stage pyrolysis reaction to obtain a first mixed oil and gas component and a first solid product; the multi-stage pyrolysis reaction includes subjecting the first mixture to a three-stage pyrolysis reaction in sequence, wherein the temperature of the first-stage pyrolysis reaction is 350-400℃, the temperature of the second-stage pyrolysis reaction is 400-450℃, and the temperature of the third-stage pyrolysis reaction is 450-550℃. S3: Separate the first mixed oil and gas components and the first solid product; S4: Catalytically recombine the first mixed oil and gas component to obtain a second mixed oil and gas component; the catalytic recombination includes recombinating the olefins and dienes in the first mixed oil and gas component to generate alkanes and aromatics, and / or, stacking short-chain olefins into long-chain olefins. S5: The second mixed oil and gas components are fractionated and refined to obtain gaseous hydrocarbons with 4 or fewer carbon atoms and a first portion of liquid hydrocarbons, wherein the first portion of liquid hydrocarbons has 5 or more carbon atoms. S6: Perform a superposition reaction on the gaseous hydrocarbon to obtain a second liquid hydrocarbon, wherein the number of carbon atoms in the second liquid hydrocarbon is greater than or equal to 5.

2. The method as described in claim 1, characterized in that, The method further includes the following steps: S7: After step S3 and before step S4, the first mixed oil and gas components are subjected to dust removal and impurity removal.

3. The method as described in claim 2, characterized in that, Step S7 and step S4 are performed in the same device.

4. The method as described in claim 1, characterized in that, In step S1, the mixing of waste plastics and pyrolysis catalyst includes mixing the waste plastics and pyrolysis catalyst under heating conditions to melt the waste plastics.

5. A system for preparing liquid hydrocarbons from waste plastics, characterized in that, The system includes: A mixing device is used to mix waste plastics and a pyrolysis catalyst to obtain a first mixture; the waste plastics include PP, PE, PET, PVC, PS and nylon; A first reaction apparatus is used to pyrolyze the first mixture to obtain a first mixed oil and gas component and a first solid product. The first reaction apparatus includes a primary pyrolysis apparatus, a secondary pyrolysis apparatus and a tertiary pyrolysis apparatus, wherein the temperature of the primary pyrolysis apparatus is 350-400℃, the temperature of the secondary pyrolysis apparatus is 400-450℃, and the temperature of the tertiary pyrolysis apparatus is 450-550℃. A first separation device is used to separate the first mixed oil and gas components and the first solid product; The second reaction device is used to catalytically recombine the first mixed oil and gas components to obtain a second mixed oil and gas component; catalytically recombine the first mixed oil and gas components to recombine the olefins and dienes in the first mixed oil and gas components to generate alkanes and aromatics, and / or to stack short-chain olefins into long-chain olefins. The second separation device is used to fractionate and refine the second mixed oil and gas components to obtain gaseous hydrocarbons with 4 or fewer carbon atoms and a first portion of liquid hydrocarbons, wherein the first portion of liquid hydrocarbons has 5 or more carbon atoms. A third reaction apparatus is used to perform a superposition reaction on the gaseous hydrocarbons to obtain a second portion of liquid hydrocarbons, wherein the second portion of liquid hydrocarbons has a carbon number greater than or equal to 5.

6. The system as described in claim 5, characterized in that, The system also includes: A dust removal and impurity removal device is used to remove dust and impurities from the first mixed oil and gas components, and the dust removal and impurity removal device is located downstream of the first separation device and upstream of the second reaction device.

7. The system as described in claim 6, characterized in that, The dust removal and impurity removal device and the second reaction device are integrated into one unit.

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