Method and apparatus for processing feed before a quenching tower

Abstract

The present invention relates to a method and a process configuration for treating a feed before a quench tower in an integrated process, the integrated process comprising at least one gasifier (1) for forming a gasification stream (3), at least one cracking furnace (2) for forming a decomposition stream (4), at least one quench tower (6) for treating a feed (5) comprising the gasification stream and the decomposition stream (3, 4), and at least one transfer line for feeding the feed to the quench tower. The gasification stream (3) is at least partially cooled to stop chemical reactions after gasification, the decomposition stream (4) is at least partially cooled after the cracking furnace (2), the gasification stream (3) is combined with the decomposition stream (4) before a transfer line valve (11) of the transfer line to form a feed (5) to the quench tower (6), and the temperature of the feed is controlled to a predetermined temperature in the transfer line before the quench tower (6). Furthermore, the present invention relates to the use of the method.

Description

Technical Field

[0001] Field This application relates to a method as defined in claim 1 and a process configuration as defined in claim 11 for treating a feed before a quench tower in an integrated process. Further, this application relates to the use of a method as defined in claim 17.

Background Art

[0002] Background Producing olefins from fossil raw materials by a cracking process such as a steam cracking process is known from the prior art.

[0003] Furthermore, it is known from the prior art that waste plastics are difficult to reuse as raw materials for new products. Mechanical reuse is the cheapest way to reuse waste plastics. Mechanically reused plastics are typically used for lower-level applications.

Summary of the Invention

Problems to be Solved by the Invention

[0004] Objective The objective is to solve the above problems. Further, the objective is to disclose a new type of method and process configuration for treating a feed before a quench tower in a cracking process. Further, the objective is to recover olefins from polyolefins and recycled plastics. Further, the objective is to improve an integrated process including a cracking device and a gasification device.

Means for Solving the Problems

[0005] Summary The method, process configuration and use are characterized by what is presented in the claims.

[0006] In the method and process configuration, the feed is processed before the quenching tower in an integrated process that includes at least one gasifier for forming a gasification flow, a decomposition furnace for forming a decomposition flow, and a quenching tower for processing the feed including the gasifier and the decomposition flow, the gasification flow is coupled to the decomposition flow to form the feed, and the temperature of the feed is controlled to a predetermined temperature before the quenching tower.

[0007] Brief explanation of the drawing The accompanying drawings included to provide a further understanding of the present invention and to constitute a part of this specification illustrate some embodiments of the invention together with descriptions that help illustrate the principles of the invention. [Brief explanation of the drawing]

[0008] [Figure 1] This is a flowchart of a process according to one embodiment. [Figure 2] This is a flowchart of the process according to another embodiment. [Figure 3] This is a flowchart of the process according to another embodiment. [Figure 4] This is a flowchart of the process according to another embodiment. [Modes for carrying out the invention]

[0009] Detailed explanation In the method, the feed is processed in front of a quenching tower in an integration process. The integration process includes at least one gasifier for forming a gasified flow by gasification, at least one decomposition furnace, e.g., a steam decomposition furnace, for forming a decomposition flow, at least one quenching tower for processing the feed containing the gasified flow and the decomposition flow, and at least one transfer line for supplying the feed to the quenching tower. The method includes at least partially cooling the gasified flow to stop the chemical reaction after gasification, at least partially cooling the decomposition flow after the decomposition furnace, coupling the gasified flow to the decomposition flow in front of a transfer line valve in the transfer line to form a feed for the quenching tower, and controlling the temperature of the feed to a predetermined temperature in the transfer line in front of the quenching tower. The transfer line includes at least one transfer line valve (11), and the gasified flow (3) is coupled with the decomposition flow (4) in front of a transfer line valve in the transfer line.

[0010] In this context, a transfer line means any transfer line between any cracking furnace and any quenching tower. A transfer line may include at least one or more transfer lines of the cracking furnace and a main transfer line. The cracking flow from the cracking furnace's transfer line is collected in the main transfer line, and the formed feed is supplied to the quenching tower via the main transfer line. At least one of the transfer lines includes at least one transfer line valve. In one embodiment, the transfer line valve is located before the main transfer line or between the cracking furnace's transfer line and the main transfer line. The transfer line valve is a valve used to isolate the cracking furnace from the main transfer line. In one embodiment, the transfer line valve is used to isolate the cracking furnace from the common transfer in order to remove carbon from the furnace core tube and transfer line heat exchanger. When the gasification flow is coupled to the cracking flow before the transfer line valve, the gasifier can be easily integrated into the cracking unit, and there are no problems with the overall cracking process. In one embodiment, the transfer line valve can be operated by opening and closing the valve. In one embodiment, the line between the gasifier and the transfer line includes a valve that can be opened and closed. Next, the line from the gasifier can be opened by opening a valve, allowing the gasified flow to be coupled with the decomposition flow, or alternatively, the valve can be closed, and the gasified flow will not be coupled with the decomposition flow.

[0011] A process configuration, i.e., apparatus for processing a feed before a quenching tower connected to an integrated process, includes at least one means for at least partially cooling the gasification flow to stop the chemical reaction after gasification; a cooling system for controlling the temperature of the feed before the quenching tower to a predetermined temperature in the transfer line; and at least one connection point in the transfer line where the gasification flow is coupled to a decomposition flow to form a feed to the quenching tower. The cooling system includes at least one cooling device for at least partially cooling the decomposition flow after the decomposition furnace. The transfer line includes at least one transfer line valve (11), and the connection point is located before the transfer line valve. In one embodiment, the connection point is located before a transfer line valve in the transfer line from the decomposition furnace to the main transfer line. The integrated process includes at least one gasifier for forming a gasification flow; at least one decomposition furnace for forming a decomposition flow; at least one quenching tower for processing a feed containing the gasification flow and the decomposition flow; and at least one transfer line for supplying the feed to the quenching tower.

[0012] Some embodiments of the method and process configuration are shown in Figures 1-4.

[0013] In the integration process, at least one gasification apparatus, including one or more gasifiers, is interconnected with a decomposition apparatus, such as an olefin decomposition apparatus. The decomposition apparatus may be a steam decomposition apparatus. The decomposition apparatus includes at least one decomposition furnace, at least one quenching tower, and at least one transfer line for supplying feed to the quenching tower. In this context, quenching tower means any quenching tower, such as a quenching tower in a main quenching apparatus or fractionation apparatus, a first quenching tower in a main quenching apparatus or fractionation apparatus, a main quenching tower, a main quenching tower, or a primary fractionation device in a fractionation apparatus. Furthermore, the decomposition apparatus includes at least one cooling device for cooling the gas to be decomposed before the quenching tower. The connection of the gasification apparatus is ideally made to a main transfer line located between the decomposition furnace and the quenching tower of the decomposition apparatus. If such a connection is not available, the gasification apparatus can be integrated within the boundaries of the decomposition furnace. Downstream equipment of the decomposition apparatus can then separate the valuable components formed in the gasifier, thereby reducing the consumption of fresh feed to the decomposition apparatus for any given olefin production level. Typically, the process conditions at the gasifier outlet must meet the requirements in the decomposition unit. In one embodiment, the pressure is typically low, around 1–3 bar(g), and the temperature is around 200–250°C. Since the flow rate from the gasifier is very low compared to the decomposition unit transfer line flow, cooling can be achieved by internal mixing inside the transfer line, thereby eliminating the need for additional quenching within the gasifier other than stopping the chemical reaction after gasification. If the connection is made within the decomposition furnace boundary, secondary cooling devices in the decomposition unit, such as secondary quenching exchangers and direct injection of desired quenching to control the temperature, can be used to meet the required decomposition conditions.

[0014] In this context, gasification within a gasifier (1) refers to any gasification process using steam. Gasification is the process of converting an initiating material into a gasified product, and consequently, a gasified flow. This is achieved by treating the initiating material with a controlled amount of steam at a suitable temperature. In one embodiment, gasification is carried out at 680-750°C. Any suitable gasifier can be used for this process. In one embodiment, the gasifier is a vertical fluidized bed gasifier. In one embodiment, the fluidized bed is an inert bed within the gasifier.

[0015] The starting material in gasification can be any suitable material. The gasification flow may be formed from plastic waste, including polyolefins and / or recycled plastics, in the gasifier. In one embodiment, the plastic waste is recycled plastic. In this context, recycled plastic means any plastic mixture composed of one or more polymers. Recycled plastic may include polyolefins, such as polyethylene or polypropylene and other polymers, as well as other components such as paper, cardboard, and / or aluminum materials. In one embodiment, recycled plastic may also include PVC plastic.

[0016] In this regard, the gasification flow (3) means any flow product formed in the gasifier, such as a gas product. In one embodiment, the gasification flow is a gas. The gasification flow may contain olefins, such as ethylene and propylene, and may be rich in olefins. Furthermore, the gasification flow may contain fragrances, such as benzene and toluene, and other hydrocarbons, such as butadiene. Typically, the gasification flow is a mixture of hydrocarbons.

[0017] A decomposition flow is formed within the decomposition furnace (2). The reaction may be carried out in the furnace at, for example, 750-900°C, and the reaction time is short, for example, less than 1 second. For example, in the gasifier, the residence time may be less than 10 seconds, 1-10 seconds in one embodiment, and 3-10 seconds in another embodiment.

[0018] In this regard, the cracking stream (4) means any stream product formed within the cracking furnace (2), such as a gas product and the like. In one embodiment, the cracking stream is a gas. The cracking stream contains olefins and typically is rich in olefins. Further, the cracking stream may contain other hydrocarbons and / or components.

[0019] In one embodiment, the gasification stream (3) is sent to the transfer line (10) and combined with the cracking stream (4) to form the feed (5) to the quench tower (6). In one embodiment, the gasification stream is combined with the cracking stream within the transfer line. In one embodiment, the transfer line is located between the cracking furnace and the quench tower. The transfer line is arranged to transfer the cracking stream (4) and the feed (5) to the quench tower.

[0020] The gasification stream from the gasifier can be connected to the cracking stream at a different process location. For example, it is directly to a transfer line connected to the precincts of an operating cracking furnace or to the quench tower. Since the flow rate of the gasification stream is low compared to the cracking stream, cooling can be achieved by in-line mixing, thereby not requiring any additional cooling equipment for the gasification stream.

[0021] In one embodiment, the process configuration includes one or more connection points. In one embodiment, the process configuration includes a plurality of connection points, and the desired connection point can be used to combine the gasification stream with the cracking stream. In this regard, the connection point can be any connection point, supply point, connection, combination, coupling, etc. by which the gasification device can be connected to the cracking device. In one embodiment, the connection point is arranged to connect to the transfer line for combining the gasification stream (3) with the cracking stream (4) within the transfer line, before the transfer line valve (11) in the transfer line. In one embodiment, the connection point is connected to the transfer line. In one embodiment, the connection point is after the cooling devices (8a, 8b) of the cracking stream, for example, after the primary cooling device or after the primary and secondary cooling devices.

[0022] In one embodiment, the gasification stream (3) is combined with the decomposition stream (4) to form the feed (5), and the feed (5) is cooled after the combination. In one embodiment, the gasification stream (3) is combined with the decomposition stream (4) to form the feed (5) without cooling the feed (5) after the combination. In one embodiment, the gasification stream (3) is combined with the decomposition stream (4) after a first cooling device, for example a primary cooling device. In one embodiment, the formed feed is cooled after the first cooling device.

[0023] In one embodiment, the cooling system is arranged to meet the design temperature of the transfer line connected to the quench tower (6). In one embodiment, the temperature of the feed is adjusted to less than 250 °C before the quench tower. In one embodiment, the temperature of the feed is less than 220 °C before the quench tower. In one embodiment, the temperature of the feed is 200 - 250 °C, in one embodiment 200 - 220 °C before the quench tower.

[0024] In one embodiment, the reaction is stopped immediately after gasification by cooling the gasification stream (3) to a temperature of less than 600 °C, in one embodiment less than 550 °C, in order to stop the chemical reaction. Then, the production of the target product, for example light olefins, can be increased or maximized.

[0025] In one embodiment, the reaction is stopped after the cracking furnace by cooling the cracking stream (4) to a temperature of less than 600 °C, in one embodiment 500 - 600 °C, in one embodiment 550 - 600 °C, in order to stop the chemical reaction. In one embodiment, the cracking stream (4) is cooled to a temperature of from 400 to 550 °C, in one embodiment from 400 to 500 °C before the combination. In one embodiment, the cracking stream (4) is cooled to a temperature of less than 250 °C in several steps before the combination. In one embodiment, the cracking stream (4) is cooled to a temperature of 200 - 250 °C, in one embodiment 200 - 220 °C before the combination.

[0026] In one embodiment, the cooling system includes at least one cooling device (8a, 8b) for cooling the decomposition flow (4) and / or feed (5). In one embodiment, the cooling system includes at least two cooling devices, e.g., primary and secondary cooling devices, for cooling the decomposition flow (4) and / or feed (5). In one embodiment, the cooling system includes at least two cooling devices, e.g., primary and secondary cooling devices, for cooling the decomposition flow (4) to a desired temperature after the decomposition furnace (2) and before coupling. In one embodiment, the cooling system includes at least one cooling device, e.g., a primary cooling device, for cooling the decomposition flow (4) and at least one cooling device, e.g., a secondary cooling device, for cooling the feed (5) after coupling. In one embodiment, at least one cooling device is a quenching exchanger. In one embodiment, the primary cooling device is a primary quenching exchanger, and the secondary cooling device is a secondary quenching exchanger.

[0027] In one embodiment, the gasification flow (3) is cooled before coupling. In one embodiment, the process configuration includes at least one cooling device (7), such as a water quencher or heat exchanger, in the gasifier before coupling in order to cool the gasification flow to a desired temperature after the gasifier (1). In one embodiment, the cooling device of the gasifier is a water quencher. In one embodiment, the cooling device of the gasifier is a heat exchanger.

[0028] In one embodiment, the gasification flow (3) is sent to the decomposition flow at a temperature of 400-550°C, or 400-500°C in one embodiment. In one embodiment, the gasification flow (3) is cooled to a temperature of 400-600°C, or 450-550°C in one embodiment, before coupling. In one embodiment, the gasification flow (3) is cooled to a temperature of 200-250°C before coupling.

[0029] In one embodiment, the feed (5) is cooled after coupling.

[0030] In one embodiment, the gasification flow (3) is coupled to the decomposition flow (4) within the transfer line, and cooling of the gasification flow can be achieved by internal mixing inside the transfer line. The gasification flow can be cooled using the decomposition flow when coupled to the decomposition flow, since the decomposition flow is larger than the gasification flow.

[0031] In one embodiment, the process configuration includes at least one cooling device (7) for at least partially cooling the gasification flow (3) after the gasifier (1) and at least one cooling device (8a, 8b) for at least partially cooling the decomposition flow (4) after the steam decomposer (2).

[0032] In one embodiment, the feed (5) or decomposition flow (4) is cooled by direct quenching (12) by injection of water and / or oil. In one embodiment, the direct injection of quenching is arranged to control the temperature of the feed or decomposition flow. In one embodiment, the existing quenching ratio can be increased to complement the additional heat from the gasifier. In one embodiment, the process configuration includes at least one direct quenching, thereby cooling the feed (5) or decomposition flow (4) by injection of water and / or oil. Any suitable direct quenching can be used. When the gasifier (1) is connected within the decomposition furnace (2), the furnace's direct quenching system can also cool the gasification flow, if the control temperature is measured downstream of the gasifier connection point. In one embodiment, water and / or oil can be recirculated to the direct quenching from, for example, a quenching tower or another quenching device. In one embodiment, the decomposition flow and / or feed is cooled by direct quenching after the decomposition flow and / or feed has cooled. In one embodiment, direct quenching injection is placed after the cooling device for the decomposition flow and / or feed.

[0033] In one embodiment, another decomposition furnace (13) may be connected to the transfer line (10). In one embodiment, at least one additional decomposition furnace in which the decomposition flow is at least partially cooled may be connected to the transfer line after the cooling devices (8a, 8b).

[0034] Potential contaminants in the gasification flow may be diluted when the gasification flow combines with the decomposition flow because the decomposition flow is larger than the gasification flow. The mass flow of the decomposition flow can typically be more than 20 times that of the mass flow of the gasification flow. Therefore, removal of contaminants is not essential. In one embodiment, the gasification flow is filtered after gasification. In one embodiment, the gasification flow is treated by dry washing and then filtered. In one embodiment, the temperature of the gasification flow after filtering is 400-430°C.

[0035] After the quenching tower, the gas (9) can be compressed for a separation unit or processed in any other way.

[0036] The method and process configuration are based on a continuous process.

[0037] In one embodiment, the method and process configuration can be used for the production of olefins, fragrances such as benzene, toluene or other fragrances, other hydrocarbons, polymers, polyolefins or similar substances, the production of products from recycled plastic waste, the reuse of polyolefins to return them to light olefins, or combinations thereof.

[0038] The present invention improves the integration of a gasifier into an existing decomposition unit, and the integration can be easily carried out without stopping the entire decomposition process. For example, additional pre-quenching to cool the gasification flow is not required. Furthermore, this process may have impurities in the produced gasification flow.

[0039] The method and process configuration offer the possibility of easily producing olefins and polyolefins, as well as energy and cost-effectiveness. The present invention provides an industrially available, simple, and readily available method for producing desired products from different starting materials. The method and process configuration are easy and simple to connect to production processes.

[0040] Furthermore, the present invention can be used to improve the recycling of plastics. Recycled materials can be easily and efficiently processed and utilized. This process can improve the quality of waste materials. [Examples]

[0041] Examples Figures 1-4 illustrate some embodiments of a process for processing feedstocks in front of a quenching tower connected to an integrated process.

[0042] The integrated process includes at least one gasifier (1) for forming a gasification flow (3), at least one decomposition furnace (2) for forming a decomposition flow (4), at least one quenching tower (6) for processing a feed (5) containing the gasification flow (3) and the decomposition flow (4), and at least one transfer line (10) for supplying the feed to the quenching tower.

[0043] The process configuration in Figure 1 includes means for at least partially cooling the gasification flow (3) to stop the chemical reaction after gasification in the gasifier (1). Furthermore, the process configuration includes a cooling system for controlling the temperature of the feed (5) to a predetermined temperature in the transfer line before the quenching tower (6). Furthermore, the process configuration includes at least one connection point where the gasification flow (3) is coupled to the decomposition flow (4) to form the feed (5) to the quenching tower. The cooling system includes at least one cooling device (8, 8a, 8b) for at least partially cooling the decomposition flow (4) after the decomposition furnace (2). The connection point is located between the cooling device in which the decomposition flow is at least partially cooled after the decomposition furnace and the quenching tower. In some embodiments, the gasification flow (3) may be cooled by a cooling device (7) after the gasifier (1) and before coupling with the decomposition flow (4). In one embodiment, the decomposition flow (4) may be cooled by at least two cooling devices (8) after the decomposition furnace (2) and before coupling. In one embodiment, the decomposition flow (4) may be cooled by a primary cooling device (8a) after the decomposition furnace (2), and then the gasification flow (3) may be coupled to the decomposition flow (4) to form a feed (5), which is cooled by a secondary cooling device (8b). The temperature of the feed (5) is adjusted to less than 250°C before the quenching tower (6).

[0044] The process configuration in Figure 2 includes means for at least partially cooling the gasification flow (3) to stop the chemical reaction after gasification in the gasifier (1). The reaction is stopped immediately by cooling the gasification flow (3) to a temperature below 600°C to stop the chemical reaction. Furthermore, the decomposition reaction is stopped after the decomposition furnace (2) by cooling the decomposition flow (4) to a temperature below 600°C to stop the chemical reaction. Furthermore, the process configuration includes a cooling system for controlling the temperature of the feed (5) to a predetermined temperature in the transfer line before the quenching tower (6). Furthermore, the process configuration includes at least one connection point where the gasification flow (3) is coupled to the decomposition flow (4) to form the feed (5) to the quenching tower. The cooling system includes at least two cooling devices (8a, 8b), e.g., primary and secondary quenching exchangers, for cooling the decomposition flow (4) to a temperature of 200-250°C after the decomposition furnace (2). The connection point is located after the cooling devices (8a, 8b) in which the decomposition flow is cooled. The gasification flow (3) is coupled to the decomposition flow (4) in the transfer line (10). The transfer line includes a transfer line valve (11), and the gasification flow (3) is coupled to the decomposition flow (4) before the transfer line valve (11). The gasification flow (3) may be cooled to a temperature of 200-250°C by at least one cooling device (7), e.g., a heat exchanger and / or a water quencher, after the gasifier (1) and before coupling with the decomposition flow (4). Alternatively, the gasification flow (3) may be coupled to the decomposition flow (4) in the transfer line, and at least part of the cooling of the gasification flow can be achieved by internal mixing inside the transfer line. The gasification flow (3) may then be sent to the decomposition flow at a temperature of 400-500°C or below 400°C, e.g., below 250°C. Furthermore, the process configuration may include at least one direct quenching (12) in which the decomposition flow (4) or feed (5) is cooled by the injection of water and / or oil. The temperature of the feed (5) is adjusted to less than 250°C in front of the quenching tower (6). The gas flow (9) is discharged from the quenching tower.

[0045] The process configuration in Figure 3 includes means for at least partially cooling the gasification flow (3) to stop the chemical reaction after gasification in the gasifier (1). The reaction is stopped immediately by cooling the gasification flow (3) to a temperature below 600°C to stop the chemical reaction. Furthermore, the decomposition reaction is stopped after the decomposition furnace (2) by cooling the decomposition flow (4) to a temperature below 600°C to stop the chemical reaction. Furthermore, the process configuration includes a cooling system for controlling the temperature of the feed (5) to a predetermined temperature in the transfer line before the quenching tower (6). Furthermore, the process configuration includes at least one connection point where the gasification flow (3) is coupled to the decomposition flow (4) to form the feed (5) to the quenching tower. The cooling system includes at least two cooling devices (8a, 8b). The decomposition flow (4) is cooled to a temperature of 400-500°C after the decomposition furnace (2) by a primary cooling device (8a), e.g., a primary quenching exchanger. Subsequently, the gasification flow (3) is coupled to the decomposition flow (4) to form the feed (5). The gasification flow (3) is sent to the decomposition flow at a temperature of 400-500°C. In one embodiment, the gasification flow (3) may be cooled by a cooling device after the gasifier (1) and before coupling with the decomposition flow (4). The formed feed (5) is cooled by a secondary cooling device (8b), such as a secondary quenching exchanger. The temperature of the feed (5) is adjusted to less than 250°C before the quenching tower (6). The gas flow (9) is discharged from the quenching tower. The transfer line includes a transfer line valve (11), and the gasification flow (3) is coupled to the decomposition flow (4) before the transfer line valve (11).

[0046] The process configuration in Figure 4 includes means (14) for at least partially cooling the gasification flow (3) to stop the chemical reaction after gasification in the gasifier (1). The reaction is stopped immediately by cooling the gasification flow (3) to a temperature below 600°C to stop the chemical reaction. Furthermore, the decomposition reaction is stopped after the decomposition furnace (2) by cooling the decomposition flow (4) to a temperature below 600°C to stop the chemical reaction. Furthermore, the process configuration includes a cooling system for controlling the temperature of the feed (5) to a predetermined temperature in the transfer line (10) before the quenching tower (6). Furthermore, the process configuration includes two connection points where the gasification flow (3) can be coupled to the decomposition flow (4) to form the feed (5) to the quenching tower. The cooling system includes at least one cooling device (8a) or alternatively two cooling devices (8a, 8b), e.g., primary and secondary quenching exchangers, for cooling the decomposition flow (4) and / or the feed (5) to a temperature of 200-250°C. The connection points (B, C) are positioned in connection with the transfer line to couple the gasifying flow (3) with the decomposing flow (4) in the main transfer line, either after the two cooling devices (8a, 8b) and before the transfer line valve (11) in transfer line (B), or after the primary cooling device (8a) of the decomposing flow and before the transfer line valve (11) in transfer line (C). The gasifying flow (3) is coupled with the decomposing flow (4) at the desired connection points (B, C). The gasifying flow (3) may be cooled to a temperature of 200-250°C by at least one cooling device (7), such as a heat exchanger and / or water quencher, after the gasifier (1) and before coupling with the decomposing flow (4). The gasifying flow (3) may be coupled with the decomposing flow (4) in the transfer line before the transfer line valve (11) (B), for example, upstream of the transfer line valve. In one embodiment, part of the cooling of the gasifying flow can be achieved by internal mixing inside the transfer line. Furthermore, the gasification flow (3) can be coupled to the decomposition flow (4) at connection point C after the primary cooling device (8a) so that the decomposition flow (4) is cooled to a temperature of 400-500°C by the primary cooling device (8a) after the decomposition furnace (2), and then the gasification flow (3) is coupled to the decomposition flow (4) to form a feed (5). The formed feed (5) can be cooled by a secondary cooling device (8b).The gasification flow (3) is sent to the decomposition flow at a temperature of 400-500°C. Furthermore, the process configuration includes at least one direct quenching (12) in which the decomposition flow (4) or feed (5) is cooled by the injection of water and / or oil. Another decomposition furnace (13) in which the decomposition flow is at least partially cooled may be connected to the transfer line (10) after the cooling devices (8a, 8b). The temperature of the feed (5) is adjusted to less than 250°C before the quenching tower (6). The gas flow (9) is discharged from the quenching tower.

[0047] Any suitable devices and equipment may be used in the processes of these embodiments.

[0048] The methods and process configurations are suitable in different embodiments for producing olefins, polyolefins, and other hydrocarbons from different starting materials.

[0049] The present invention is not limited to the embodiments mentioned above, but rather many variations are possible within the scope of the concept of the invention as defined by the claims.

Claims

1. A method for processing a feed before a quenching tower, wherein a gasification flow (3) is formed by gasification in a gasifier (1), a decomposition flow (4) is formed in a decomposition furnace (2) in a decomposition unit, the gasifier is integrated into the decomposition unit, the feed (5) including the gasification flow and the decomposition flow (3, 4) is processed in a quenching tower (6), the feed is supplied to the quenching tower via a main transfer line of at least one transfer line, and the method is: - In order to form the gasification flow (3), recycled plastic is gasified in the gasifier, and the gasification flow (3) is cooled immediately after gasification to stop the chemical reaction. - The decomposition flow (4) is cooled at least partially after the decomposition furnace (2), - A transfer line valve (11) is placed in the transfer line, and the transfer line valve is used to isolate the decomposition furnace from the main transfer line and to connect the gasification flow (3) to the decomposition flow (4) before the transfer line valve (11) in the transfer line in order to form the feed (5) to the quenching tower (6) from which the gas is discharged. - Controlling the temperature of the feed material in front of the quenching tower (6) to a predetermined temperature in the transfer line. Methods that include...

2. The method according to claim 1, characterized in that the temperature of the feed is adjusted to be less than 250°C in front of the quenching tower.

3. The method according to claim 1 or 2, wherein the gasification flow (3) is coupled to the decomposition flow (4) to form the feed (5), and the feed (5) is cooled after coupling.

4. The method according to any one of claims 1 to 3, wherein the gasification flow (3) is cooled before coupling.

5. The method according to any one of claims 1 to 4, wherein the gasification flow (3) is sent to the decomposition flow at a temperature of 400 to 500°C.

6. The method according to any one of claims 1 to 5, wherein the gasification flow (3) is cooled to a temperature of 200 to 250°C before coupling.

7. The method according to any one of claims 1 to 6, wherein the decomposition flow (4) is cooled to a temperature of 400 to 500°C before coupling.

8. The method according to any one of claims 1 to 7, wherein the decomposition flow (4) is cooled to a temperature of 200 to 250°C before coupling.

9. The method according to any one of claims 1 to 8, wherein the feed (5) or the decomposition flow (4) is cooled by direct rapid cooling by injection of water and / or oil.

10. Apparatus for processing feed before a quenching tower, the apparatus comprising: a decomposition apparatus including at least one gasifier (1) for forming a gasified flow (3) by gasification; at least one decomposition furnace (2) for forming a decomposition flow (4); at least one quenching tower (6) for processing the feed (5) including the gasified flow (3) and the decomposition flow (4); at least one transfer line including a main transfer line for supplying the feed to the quenching tower (6); and the gasifier integrated into the decomposition apparatus, the apparatus is - In order to immediately stop the chemical reaction after gasification, at least one means for cooling the gasification flow (3) formed from recycled plastic, - A cooling system (7, 8a, 8b) for controlling the temperature of the feed material to a predetermined temperature in the transfer line before the quenching tower (6), the cooling system (7, 8a, 8b) including at least one cooling device (8a) for at least partially cooling the decomposition flow (4) after the decomposition furnace (2), - At least one connection point in the transfer line where the gasification flow (3) is coupled to the decomposition flow (4) to form the feed (5) to the quenching tower (6) from which the gas is discharged, wherein the transfer line includes at least one transfer line valve (11), the transfer line valve is used to isolate the decomposition furnace from the main transfer line, and the connection point is located before the transfer line valve, and A device including a device.

11. The apparatus according to claim 10, wherein the cooling system includes at least one cooling device (8a, 8b) for cooling the decomposition flow (4) and / or the feed (5).

12. The apparatus according to claim 10 or 11, further comprising at least one cooling device (7) for further cooling the gasified flow (3) after the gasifier (1).

13. The apparatus according to any one of claims 10 to 12, wherein the cooling system includes at least two cooling devices (8a, 8b) for cooling the decomposition flow (4) before the gasification flow (3) and the decomposition flow (4) are combined at the connection point.

14. The apparatus according to any one of claims 10 to 13, wherein the cooling system includes at least one cooling device (8a) for cooling the decomposition flow (4) and at least one cooling device (8b) for cooling the feed (5).

15. The apparatus according to any one of claims 10 to 14, comprising at least one direct quenching, wherein the feed (5) or the decomposition flow (4) is cooled by the injection of water and / or oil.

16. A method according to any one of claims 1 to 9, wherein the method is used for the production of olefins, fragrances, other hydrocarbons, polymers, or polyolefins, for the production of products from recycled plastic waste, for the recycling of polyolefins back into light olefins, or a combination thereof.

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