Regeneration system of olefin disproportionation processor

Abstract

The invention discloses an olefin disproportionation processor regeneration system, and belongs to the technical field of olefin conversion, the olefin disproportionation processor regeneration system comprises a C4 processor and an OCT processor, the outlet end of the C4 processor and the outlet end of the OCT processor are jointly connected with a regeneration buffer tank, and the inlet end of the C4 processor and the inlet end of the regeneration buffer tank are connected with nitrogen pipelines; a gas phase outlet of the regeneration buffer tank is connected with the inlet end of the C4 processor and the inlet end of the OCT processor. The C-4 processor and the OCT processor are subjected to closed cyclic regeneration, so that the two processors can be regenerated together or independently, mutual interference is avoided, the pressure of a closed cyclic regeneration system is low and stable, a torch is not discharged, meanwhile, nitrogen consumption can be greatly reduced, steam consumption can be reduced, and the C-4 processor and the OCT processor are more energy-saving and environment-friendly, and are low in production and operation cost and low in investment cost.

Description

Technical Field

[0001] This invention belongs to the field of olefin conversion technology, and more specifically, relates to an olefin disproportionation processor regeneration system. Background Technology

[0002] The olefin conversion unit uses a mixture of C4 or C4 / C5 olefins as feedstock. By controlling appropriate reaction conditions and using proprietary catalysts, the olefins in the C4 or C4 / C5 olefins react with ethylene to produce high-purity propylene. This propylene is then purified through a subsequent distillation column to obtain qualified propylene, and ethylene is recovered. The olefin conversion unit employs a fixed-bed reactor and a high-efficiency catalyst process. Excess ethylene is used during the reaction to improve the conversion rates of butene and pentene, as well as the selectivity of propylene. Excess unreacted ethylene is recovered and separated downstream and recycled back to the reactor for further reaction, reducing ethylene consumption. Furthermore, the reaction within the olefin conversion unit is isothermal, requiring virtually no energy, significantly reducing the unit's energy consumption.

[0003] The reaction of C4 or C4 / C5 olefins with ethylene is an olefin disproportionation reaction. Olefin disproportionation is a catalytic reaction in which the carbon-carbon double bonds of an olefin are recombined into new olefins. Under the action of a catalyst, disproportionation reactions can convert olefin compounds into new olefin compounds. For example, 1-butene and 2-butene react to produce propylene and 2-pentene; similarly, 1-butene reacts with itself to produce ethylene and 3-hexene. Therefore, compounds involved in the disproportionation of n-butene include ethylene, propylene, 1-butene, 2-butene, 2-pentene, and 3-hexene. When there is excess ethylene in the feedstock, the dominant reaction is the reaction of 2-butene with ethylene to produce propylene, and the reaction of 2-pentene with ethylene to produce propylene and 1-butene, while some side reactions also occur.

[0004] The olefin disproportionation unit is fed with high-olefin-content C4 or C4 / C5 olefins, which react with the catalyst in a closed reactor. By controlling the reaction temperature and pressure and reducing the generation of side reactions, polymer-grade propylene products are obtained, which are then sent to a subsequent distillation column for separation and purification to obtain qualified propylene.

[0005] Currently, during the regeneration process of the processor in the olefin disproportionation unit, the regeneration gas generated is directly discharged to the flare due to the continuous injection of nitrogen, causing the flare lamp to go out, which poses a safety hazard. Alternatively, the regeneration gas may be directly discharged into the atmosphere, causing environmental pollution. The unit also consumes a large amount of nitrogen, has high energy consumption, high production costs, is difficult to operate, and the organic matter carried in the regeneration gas is directly discharged or burned, wasting resources and polluting the environment. Summary of the Invention

[0006] The purpose of this invention is to provide an olefin disproportionation processor regeneration system that regenerates C4 processors and OCT processors in a closed-loop cycle, allowing the two processors to regenerate together or independently without interference. The closed-loop regeneration system has low and stable pressure, does not emit flares, and significantly reduces nitrogen and steam consumption, making it more energy-efficient and environmentally friendly with low production and operating costs and low investment costs.

[0007] To achieve the objective of this invention, the technical solution adopted is as follows: an olefin disproportionation processor regeneration system, comprising a C4 processor and an OCT processor, wherein the outlet end of the C4 processor and the outlet end of the OCT processor are both connected to a regeneration buffer tank, and the inlet end of the C4 processor and the inlet end of the regeneration buffer tank are both connected to nitrogen pipelines; the gas phase outlet of the regeneration buffer tank is connected to the inlet end of the C4 processor and the inlet end of the OCT processor, respectively.

[0008] Furthermore, a heating device is also installed at the inlet of the C4 processor.

[0009] Furthermore, the heating device is a steam heater and / or an electric heater.

[0010] Furthermore, the nitrogen pipeline at the inlet end of the C4 processor is also provided with a parallel pipeline arranged in parallel with the heating device.

[0011] Furthermore, a cooler is also installed at the inlet end of the regeneration buffer tank.

[0012] Furthermore, an induced draft fan is installed at the gas phase outlet of the regeneration buffer tank.

[0013] Furthermore, it also includes a second heating device and a second cooler arranged in parallel, with the inlet end of the second heating device and the inlet end of the second cooler connected to the outlet end of the induced draft fan, and the outlet end of the second heating device and the outlet end of the second cooler connected to the inlet end of the C4 processor and the inlet end of the OCT processor, respectively.

[0014] Furthermore, the second heating device is a steam heater and / or an electric heater.

[0015] Furthermore, the liquid phase outlet of the regeneration buffer tank is also connected to a sludge tank.

[0016] The beneficial effects of this invention are:

[0017] 1. This invention adopts a rationally laid-out regeneration system with a simple structure, small footprint, and low investment cost;

[0018] 2. The regeneration system provided by this invention is a closed-loop system that is safe, reliable, environmentally friendly, and consumes little regenerated nitrogen, resulting in low production and operating costs.

[0019] 3. When the OCT processor in this invention is regenerated independently, the induced draft fan operates under low load, low power consumption, and low energy consumption.

[0020] 4. By setting up a regeneration buffer tank and a sludge tank, the organic matter generated during the regeneration process can be effectively recovered, which is highly efficient and increases added value.

[0021] 5. The C4 processor and OCT processor in this invention can be regenerated together or separately, and are easy to operate and control.

[0022] 6. The present invention uses a steam heater, which is more energy-efficient and has low operating costs. Attached Figure Description

[0023] The accompanying drawings illustrate exemplary embodiments of the invention and, together with the description thereof, serve to explain the principles of the invention. These drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification.

[0024] Figure 1 This is a flowchart of Embodiment 1 provided by the present invention;

[0025] Figure 2 This is a flowchart of Embodiment 2 provided by the present invention.

[0026] The attached diagram shows the markings and corresponding component names:

[0027] 1-C4 processor; 2-OCT processor; 3-Regeneration buffer tank; 4-Sludge oil tank; 5-Exhaust fan; 6-Steam heater one; 7-Electric heater one; 8-Cooler one; 9-Steam heater two; 10-Electric heater two; 11-Cooler two; 12-Nitrogen line one; 13-Nitrogen line two; 14-Parallel pipeline. Detailed Implementation

[0028] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be noted that, for ease of description, only the parts relevant to the present invention are shown in the accompanying drawings.

[0029] It should be noted that, unless otherwise specified, the embodiments and features described in this invention can be combined with each other. The invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0030] Example 1

[0031] like Figure 1As shown, this embodiment provides an olefin disproportionation processor regeneration system, including a C4 processor 1 and an OCT processor 2. The outlet of the C4 processor 1 is connected to the inlet of the regeneration buffer tank 3 via a pipeline, and the inlet of the C4 processor 1 is connected to a nitrogen pipeline 12. The nitrogen pipeline 12 is used to deliver fresh nitrogen into the C4 processor 1, and a steam heater 6 and an electric heater 7 are installed on the nitrogen pipeline 12. The electric heater 7 is located between the steam heater 6 and the C4 processor 1. By first heating the nitrogen with the steam heater 6 and then heating it with the electric heater 7, the heating effect of the nitrogen is ensured, and the temperature of the nitrogen entering the C4 processor 1 can be accurately controlled. The outlets of both the C4 processor 1 and the OCT processor 2 are connected to the inlet of a cooler 8 via pipelines, and the outlet of the cooler 8 is connected to the inlet of the regeneration buffer tank 3 via a pipeline. The inlet end of the regeneration buffer tank 3 is also connected in parallel with a nitrogen pipeline 2 13, which is used to transport fresh nitrogen into the regeneration buffer tank 3.

[0032] In this embodiment, when the temperature of fresh nitrogen is low and it needs to be heated before entering the regeneration buffer tank 3, the inlet end of nitrogen pipeline 2 13 can be directly connected in parallel to the outlet end of electric heater 7; when the temperature of fresh nitrogen can directly meet the working requirements of regeneration buffer tank 3, the inlet end of nitrogen pipeline 2 13 can be directly connected in parallel to the inlet end of steam heater 6; similarly, when the temperature of nitrogen transported by nitrogen pipeline 2 13 meets the working requirements of regeneration buffer tank 3, the outlet end of nitrogen pipeline 2 13 can be directly connected in parallel to the pipeline between the outlet end of cooler 8 and the inlet end of regeneration buffer tank 3; when the temperature of nitrogen transported by nitrogen pipeline 2 13 needs to be cooled before it meets the working requirements of regeneration buffer tank 3, the outlet end of nitrogen pipeline 2 13 can be directly connected in parallel to the inlet end of cooler 8.

[0033] The gas phase outlet of the regeneration buffer tank 3 is also connected to an induced draft fan 5 via a pipeline. Two pipelines are connected in parallel to the outlet of the induced draft fan 5. One pipeline is equipped with both a steam heater 9 and an electric heater 10, while the other pipeline is equipped with a cooler 11. This allows nitrogen gas delivered by the induced draft fan 5 to be sent to both the steam heater 9 and the electric heater 10 for heating, and to the cooler 11 for cooling. Regarding the installation of the steam heater 9 and the electric heater 10, the inlet of the electric heater 10 is connected to the outlet of the steam heater 9. By first heating the nitrogen gas with the steam heater 6 and then heating it with the electric heater 7, the heating effect of the nitrogen gas is ensured, and the temperature of the nitrogen gas entering the C4 processor 1 can be precisely controlled. The outlet ends of electric heater 2 10 and cooler 2 11 can be connected to nitrogen pipeline 1 12 via pipelines, and the outlet ends of electric heater 2 10 and cooler 2 11 can also be connected to the inlet end of OCT processor 2 via pipelines, so that the nitrogen heated by steam heater 2 9 and electric heater 2 10 can enter C4 processor 1 or OCT processor 2 as needed, and the nitrogen cooled by cooler 2 11 can also enter C4 processor 1 or OCT processor 2 as needed.

[0034] Of course, nitrogen heated by steam heater 29 and electric heater 210 can also simultaneously enter C4 processor 1 and OCT processor 2, and nitrogen cooled by cooler 211 can also simultaneously enter C4 processor 1 and OCT processor 2. In this embodiment, a low-power motor is selected for the induced draft fan 5. The induced draft fan 5 guides the nitrogen delivered from the regeneration buffer tank 3, resulting in low load, low power consumption, energy saving, and low production and operating costs. By using the combination of steam heater 29 and electric heater 210 and the switching between cooler 21, the temperature of the closed regeneration system can be flexibly switched, the pressure and temperature of the closed system are stable, and it is easy to operate.

[0035] To facilitate the recovery of organic matter generated during the regeneration process in the regeneration buffer tank 3, the liquid phase outlet of the regeneration buffer tank 3 is also connected to the sludge tank 4. The organic matter is recovered through the sludge tank 4, and the recovered organic matter can be processed for refining or sold directly to increase added value.

[0036] In this embodiment, steam heater 6 and steam heater 9 can also be replaced by condensate heaters, or the high-temperature flue gas in the furnace chimney can be used directly as the heating medium for preheating and heating. In this embodiment, electric heater 7 and electric heater 10 are heated by electricity, which is convenient to control and achieves a more energy-saving effect.

[0037] In this embodiment, the C4 processor 1 and the OCT processor 2 work together to enable the entire regeneration system to regenerate in a closed loop or to regenerate separately without interference, making it easy to operate. Simultaneously, no nitrogen is emitted during the entire regeneration process, ensuring safety, reliability, and environmental friendliness. The regeneration system provided in this embodiment has low nitrogen consumption, energy saving, low operating costs, and low investment costs.

[0038] Example 2

[0039] like Figure 2 As shown, this embodiment provides an olefin disproportionation OCT processor 2 regeneration system, including a C4 processor 1 and an OCT processor 2. The outlet end of the C4 processor 1 is connected to the inlet end of the regeneration buffer tank 3 via a pipeline, and the inlet end of the C4 processor 1 is connected to a nitrogen pipeline 12. The nitrogen pipeline 12 is used to deliver fresh nitrogen into the C4 processor 1, and an electric heater 7 is installed on the nitrogen pipeline 12. The outlet ends of the C4 processor 1 and the OCT processor 2 are both connected to the inlet end of a cooler 8 via pipelines, and the outlet end of the cooler 8 is connected to the inlet end of the regeneration buffer tank 3 via a pipeline. The inlet end of the regeneration buffer tank 3 is also connected in parallel to a nitrogen pipeline 13, which is used to deliver fresh nitrogen into the regeneration buffer tank 3.

[0040] In this embodiment, when the temperature of fresh nitrogen is low and it needs to be heated before entering the regeneration buffer tank 3, the inlet end of nitrogen pipeline 2 13 can be directly connected in parallel to the outlet end of electric heater 1 7; when the temperature of fresh nitrogen can directly meet the working requirements of regeneration buffer tank 3, the inlet end of nitrogen pipeline 2 13 can be directly connected in parallel to the inlet end of electric heater 1 7; similarly, when the temperature of nitrogen transported by nitrogen pipeline 2 13 meets the working requirements of regeneration buffer tank 3, the outlet end of nitrogen pipeline 2 13 can be directly connected in parallel to the pipeline between the outlet end of cooler 1 8 and the inlet end of regeneration buffer tank 3; when the temperature of nitrogen transported by nitrogen pipeline 2 13 needs to be cooled before it meets the working requirements of regeneration buffer tank 3, the outlet end of nitrogen pipeline 2 13 can be directly connected in parallel to the inlet end of cooler 1 8.

[0041] The gas phase outlet of the regeneration buffer tank 3 is also connected to an induced draft fan 5 via a pipeline. The outlet end of the induced draft fan 5 is connected in parallel to an electric heater 10 and a cooler 11 via a pipeline, so that the nitrogen gas delivered by the induced draft fan 5 can be sent into the electric heater 10 for heating, and the nitrogen gas delivered by the induced draft fan 5 can be sent into the cooler 11 for cooling. At the same time, the outlet ends of the electric heater 10 and the cooler 11 can be connected to the nitrogen pipeline 12 via pipelines, and the outlet ends of the electric heater 10 and the cooler 11 can also be connected to the inlet end of the OCT processor 2 via pipelines, so that the nitrogen gas heated by the electric heater 10 can enter the C4 processor 1 or the OCT processor 2, and the nitrogen gas cooled by the cooler 11 can also enter the C4 processor 1 or the OCT processor 2, depending on the selection.

[0042] Of course, nitrogen heated by electric heater 210 can also simultaneously enter C4 processor 1 and OCT processor 2, and nitrogen cooled by cooler 211 can also simultaneously enter C4 processor 1 and OCT processor 2. In this embodiment, a low-power motor is selected for the induced draft fan 5. The induced draft fan 5 guides the nitrogen delivered from the regeneration buffer tank 3, resulting in low load, low power consumption, energy saving, and low production and operating costs. By switching between electric heater 210 and cooler 21, the temperature of the closed regeneration system can be flexibly switched, the pressure and temperature of the closed system are stable, and it is easy to operate.

[0043] In this embodiment, when the temperature of the fresh nitrogen gas supplied to the C4 processor 1 through the nitrogen pipeline 12 meets the working requirements of the C4 processor 1, in order to reduce the energy consumption of the regeneration system, a parallel pipeline 14 can be connected in parallel between the inlet end of the electric heater 7 and the inlet end of the C4 processor 1. This allows the fresh nitrogen gas entering the nitrogen pipeline 12 to enter the C4 processor 1 directly through the parallel pipeline 14 without being heated by the electric heater 7, so that the electric heater 7 does not need to work in this case.

[0044] To facilitate the recovery of organic matter generated during the regeneration process in the regeneration buffer tank 3, the liquid phase outlet of the regeneration buffer tank 3 is also connected to the sludge tank 4. The organic matter is recovered through the sludge tank 4, and the recovered organic matter can be processed for refining or sold directly to increase added value.

[0045] In this embodiment, electric heater 7 and electric heater 10 directly adopt electric heating, which is convenient to control and achieves a more energy-efficient effect.

[0046] In this embodiment, the C4 processor 1 and the OCT processor 2 work together to enable the entire regeneration system to regenerate in a closed loop or to regenerate separately without interference, making it easy to operate. Simultaneously, no nitrogen is emitted during the entire regeneration process, ensuring safety, reliability, and environmental friendliness. The regeneration system provided in this embodiment has low nitrogen consumption, energy saving, low operating costs, and low investment costs.

[0047] In the description of this specification, the references to terms such as "one embodiment / mode," "some embodiments / modes," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment / mode or example is included in at least one embodiment / mode or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment / mode or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments / modes or examples. Furthermore, without contradiction, those skilled in the art can combine and integrate the different embodiments / modes or examples described in this specification, as well as the features of different embodiments / modes or examples.

[0048] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0049] Those skilled in the art should understand that the above embodiments are merely for illustrating the present invention and are not intended to limit the scope of the invention. Those skilled in the art can make other changes or modifications based on the above disclosure, and these changes or modifications still fall within the scope of the present invention.

Claims

1. An olefin disproportionation processor regeneration system, characterized in that: The invention comprises a C4 processor (1) and an OCT processor (2); the outlet end of the C4 processor (1) and the outlet end of the OCT processor (2) are commonly connected to a regeneration buffer tank (3); and the inlet end of the C4 processor (1) and the inlet end of the regeneration buffer tank (3) are also both connected to a nitrogen pipeline; the gas phase outlet of the regeneration buffer tank (3) is respectively connected to the inlet end of the C4 processor (1) and the inlet end of the OCT processor (2).

2. The olefin disproportionation processor regeneration system according to claim 1, characterized in that: The inlet end of the C4 processor (1) is also equipped with a heating device.

3. The olefin disproportionation processor regeneration system according to claim 2, characterized in that: The heating device is a steam heater (6) or / and an electric heater (7).

4. The olefin disproportionation processor regeneration system according to claim 2, characterized in that: A parallel pipeline (14) arranged in parallel with the heating device is also provided on the nitrogen pipeline at the inlet end of the C4 processor (1).

5. The olefin disproportionation processor regeneration system according to claim 1, characterized in that: A cooler (8) is also installed at the inlet end of the regeneration buffer tank (3).

6. The olefin disproportionation processor regeneration system according to claim 1, characterized in that: The gas phase outlet of the regeneration buffer tank (3) is also equipped with an induced draft fan (5).

7. The olefin disproportionation processor regeneration system according to any one of claims 1 to 6, characterized in that: It also includes a heating device 2 and a cooler 2 (11) arranged in parallel, and the inlet end of the heating device 2 and the inlet end of the cooler 2 (11) are connected to the outlet end of the induced draft fan (5), and the outlet end of the heating device 2 and the outlet end of the cooler 2 (11) are respectively connected to the inlet end of the C4 processor (1) and the inlet end of the OCT processor (2).

8. The olefin disproportionation processor regeneration system according to claim 7, characterized in that: The second heating device is a second steam heater (9) or / and a second electric heater (10).

9. The olefin disproportionation processor regeneration system according to any one of claims 1 to 6, characterized in that: The liquid phase outlet of the regeneration buffer tank (3) is also connected to a waste oil tank (4).

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