A polyolefin single loop reactor

Abstract

The utility model relates to a kind of polyolefin monocyclic tube reactor, solve the polyolefin product of different reaction conditions of existing generally needs different reactor, to cause the problem of high production cost. Including reaction inner cylinder and jacket body, first straight pipe reaction tube, second vertical reaction tube, U bend, L bend and axial flow pump form a closed reaction inner cylinder, first jacket cylinder, second jacket cylinder and jacket connecting section form jacket body, cooling water flows in jacket body, remove the heat generated in reaction process, so that reaction process is carried out under constant temperature, thermometer mouth and pressure gauge mouth are equipped on inner cylinder, temperature and pressure can be detected, first safety valve mouth and second safety valve mouth protect device in high pressure, high temperature and other special conditions, nitrogen inlet and gas outlet can discharge oxygen of inner cylinder, satisfy the production of a variety of polyolefin products or polyolefin products with special function, and production cost is low.

Description

Technical Field

[0001] This utility model relates to the field of petrochemical machinery, specifically to a polyolefin single-loop tube reactor. Background Technology

[0002] Industrial-scale loop reactors have been successfully applied in the polyolefin industry. Due to their advantages such as simple structure, high heat transfer efficiency, uniform flow distribution, and ease of automation and continuous operation, loop reactors are widely used.

[0003] Existing reactor structures are mostly dual-loop reactors, which consist of two mirror-symmetrical reactors connected in series. The material circulates from the first reactor to the second, achieving heat and mass transfer and polymerization during the flow process. Dual-loop reactors are commonly used in large-scale industrial production plants, particularly for the production of polyolefins.

[0004] Currently, the market for conventional polyolefin products is approaching saturation, and the future development space for dual-loop reactors is increasingly limited. However, high-end polyolefin products, or those with special functions, remain in high demand and short supply. Polymerization is the key to polyolefin production, and depending on the catalyst, reaction pressure, and reaction medium, it is mainly divided into high-pressure, medium-pressure, and low-pressure processes. Different processes correspond to different product types. Due to the different product types, polyolefin products requiring different reaction conditions typically require different reactors, leading to high production costs. Utility Model Content

[0005] The purpose of this invention is to solve the problem that existing polyolefin products with different reaction conditions usually require different reactors, resulting in high production costs.

[0006] The technical solution adopted to solve the technical problem proposed by this utility model is as follows: The feeding polyolefin single-loop tube reactor of this utility model includes a reaction inner cylinder and a jacket body. The inner cylinder includes a first straight reaction tube, a second vertical reaction tube, a U-shaped elbow, an L-shaped elbow, and an axial flow pump. The two ends of the U-shaped elbow are respectively connected to the top ends of the first straight reaction tube and the second vertical reaction tube. The bottom of the first straight reaction tube is provided with a slurry inlet. The U-shaped elbow is provided with a slurry outlet, a nitrogen inlet, a gas outlet, and a first safety valve. One end of the L-shaped elbow is connected to the bottom end of the second vertical reaction tube. The other end of the L-shaped elbow is connected to the pump outlet of the axial flow pump, and the pump inlet of the axial flow pump is connected to the bottom end of the first straight reaction tube. The L-shaped elbow is provided with a discharge port, and the inner cylinder is provided with a thermometer port and a pressure gauge port. The jacket body includes a first jacket cylinder sleeved outside the first straight reaction tube, a second jacket cylinder sleeved outside the second vertical reaction tube, and a jacket connecting section connecting the first jacket cylinder and the second jacket cylinder. The bottom of the second jacket cylinder is provided with a chilled water inlet, and the bottom of the first jacket cylinder is provided with a chilled water outlet. The jacket body is provided with a jacket expansion joint, a second safety valve port, and a jacket exhaust port.

[0007] The technical solutions that further define this utility model include: The top and bottom of the first and second jacketed cylinders are respectively provided with reducing pipes.

[0008] A connecting beam is provided between the first jacket cylinder and the second jacket cylinder.

[0009] The first vertical reaction tube, the second vertical reaction tube, the U-shaped bend, and the L-shaped bend are all equipped with thermometer ports, and the second vertical reaction tube and the L-shaped bend are all equipped with pressure gauge ports.

[0010] Both the first and second jacket cylinders are provided with jacket drain ports at their bottoms.

[0011] Both the first and second jacketed cylinders are provided with ring seats at their bottoms.

[0012] The first jacket cylinder, the second jacket cylinder, and the jacket connecting pipe are all equipped with jacket expansion joints.

[0013] Both the first and second jacketed cylinders are provided with jacket exhaust ports at their tops.

[0014] The second safety valve port is located on the jacket connection section.

[0015] The L-shaped bend is equipped with a spare port.

[0016] The beneficial effects of this utility model through the above technical solution are as follows: The first straight reaction tube, the second vertical reaction tube, the U-shaped bend, the L-shaped bend, and the axial flow pump of the polyolefin single-loop reactor of this utility model form a closed reaction inner cylinder. The first jacket cylinder, the second jacket cylinder, and the jacket connecting section form a jacket body. Cooling water flows in the jacket body to remove the heat generated during the reaction process, so that the reaction process is carried out at a constant temperature. The U-shaped bend is provided with a nitrogen inlet, a gas outlet, and a first safety valve. The inner cylinder is provided with a thermometer port and a pressure gauge port, which can detect temperature and pressure. The first safety valve and the second safety valve provide protection for the device under special conditions such as high pressure and high temperature. The nitrogen inlet and the gas outlet can discharge oxygen from the inner cylinder, which can meet the production of various polyolefin products or polyolefin products with special functions, and the production cost is low. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a polyolefin single-loop tube reactor according to the present invention.

[0018] The components include: inner cylinder 1, first straight reaction pipe 11, slurry inlet 111, second vertical reaction pipe 12, U-shaped elbow 13, slurry outlet 131, nitrogen inlet 132, gas outlet 133, first safety valve port 134, L-shaped elbow 14, discharge port 141, axial flow pump 15, pump suction port 151, pump discharge port 152, thermometer port 16, pressure gauge port 17, jacket body 2, first jacket cylinder 21, chilled water outlet 211, second jacket cylinder 22, chilled water inlet 221, jacket connecting section 23, jacket expansion joint 24, second safety valve port 25, jacket exhaust port 26, reducing pipe 27, jacket drain port 28, connecting beam 3, ring seat 4, and spare port 5. Detailed Implementation

[0019] The structure of this utility model will be further described below with reference to the accompanying drawings.

[0020] Reference Figure 1A side discharge overflow adjustment mechanism with a slide plate 2 includes an inner reaction cylinder 1 and a jacket body 2. The inner cylinder 1 includes a first straight reaction pipe 11, a second vertical reaction pipe 12, a U-shaped elbow 13, an L-shaped elbow 14, and an axial flow pump 15. The two ends of the U-shaped elbow 13 are respectively connected to the top ends of the first straight reaction pipe 11 and the second vertical reaction pipe 12. In this embodiment, the two ends of the U-shaped elbow 13 are respectively sealed to the top ends of the first straight reaction pipe 11 and the second vertical reaction pipe 12 through flanges. The bottom of the first straight reaction tube 11 is equipped with a slurry inlet 111. The U-shaped elbow 13 is equipped with a slurry outlet 131, a nitrogen inlet 132, a gas outlet 133, and a first safety valve port 134. Before use, nitrogen is introduced through the nitrogen inlet 132 to expel oxygen from the inner reaction cylinder. One end of the L-shaped elbow 14 is connected to the bottom end of the second vertical reaction tube 12, and the other end of the L-shaped elbow 14 is connected to the pump outlet 152 of the axial flow pump 15. The pump inlet 151 of the axial flow pump 15 is connected to the bottom end of the first straight reaction tube 11. The L-shaped elbow 14 is equipped with a discharge port 141. After the reaction is completed, the product is discharged from the discharge port. The inner cylinder 1 is equipped with a thermometer port 16 and a pressure gauge port 17. With the power provided by the axial flow pump 15, the reaction slurry flows out from the pump outlet 152 and flows in from the pump inlet 151, thereby realizing the circulation of the reaction slurry inside the inner cylinder. In the event of special circumstances such as high pressure or high temperature during the reaction, the first safety valve 134 acts as a protective device and is a safety accessory. The purpose of the gas outlet 133 is to allow gas to escape during the injection of the reaction slurry into the inner cylinder 2, so that the reaction slurry can fill the interior of the inner cylinder 2 as much as possible.

[0021] In this embodiment, thermometer ports 16 are provided on the first straight reaction tube 11, the second vertical reaction tube 12, the U-shaped bend 13, and the L-shaped bend 14, and pressure gauge ports 17 are provided on the second vertical reaction tube 12 and the L-shaped bend 14. This allows for multi-point real-time monitoring of the internal temperature and pressure during the reaction process, thereby determining whether the reaction is proceeding smoothly.

[0022] In this embodiment, the L-shaped elbow 14 is provided with a spare port 5. The purpose is to provide a spare port for future functional additions.

[0023] The jacket body 2 includes a first jacket cylinder 21 fitted outside the first straight reaction tube 11, a second jacket cylinder 22 fitted outside the second vertical reaction tube 12, and a jacket connecting section 23 connecting the first jacket cylinder 21 and the second jacket cylinder 22. The bottom of the second jacket cylinder 22 is provided with a chilled water inlet 221, and the bottom of the first jacket cylinder 21 is provided with a chilled water outlet 211. The jacket body 2 is provided with a jacket expansion joint 24, a second safety valve port 25, and a jacket vent port 26. In this embodiment, the first jacket cylinder 21, the second jacket cylinder 22, and the jacket connecting tube are all provided with jacket expansion joints 24. The jacket expansion joints 24 are used to eliminate the lateral expansion displacement of the first jacket cylinder 21 and the second jacket cylinder 22 due to temperature difference, as well as the axial expansion displacement of the jacket connecting section due to temperature difference.

[0024] In this embodiment, the top and bottom of the first jacket cylinder 21 and the second jacket cylinder 22 are respectively provided with reducing pipes 27. The reducing pipes 27 can select the appropriate size of the first jacket cylinder 21 and the second jacket cylinder 22 according to the size of the first straight tube reaction tube 11 and the second vertical reaction tube 12, thereby selecting a suitable jacket body.

[0025] In this embodiment, a connecting beam 3 is provided between the first jacket cylinder 21 and the second jacket cylinder 22. In specific implementation, an appropriate number of connecting beams 3 can be set as needed, so that the reactor structure can be safer and more stable.

[0026] In this embodiment, both the bottom of the first jacket cylinder 21 and the second jacket cylinder 22 are provided with jacket drain ports 28. After the reaction is completed, the cooling water inside the first jacket cylinder 21 and the second jacket cylinder 22 is discharged through the jacket drain ports 28 for easy cleaning.

[0027] In this embodiment, both the bottom of the first jacket cylinder 21 and the second jacket cylinder 22 are provided with ring seats 4. The ring seats 4 serve to support and fix the entire reactor.

[0028] In this embodiment, both the top of the first jacket cylinder 21 and the second jacket cylinder 22 are provided with jacket exhaust ports 26. During the process of injecting cooling water into the first jacket cylinder 21 and the second jacket cylinder 22, gas is discharged from the jacket exhaust ports 26, so that the cooling water fills the interior of the first jacket cylinder 21 and the second jacket cylinder 22 as much as possible.

[0029] In this embodiment, the second safety valve port 25 is located on the jacket connection section 23. When cooling water flows through the jacket, if special situations such as high pressure or high temperature occur, the second safety valve port 25 acts as a protective device and is a safety accessory.

[0030] The polyolefin single-loop reactor of this invention comprises a first straight reaction tube 11, a second vertical reaction tube 12, a U-shaped bend 13, an L-shaped bend 14, and an axial flow pump 15, forming a closed inner reaction cylinder 1. A first jacketed cylinder 21, a second jacketed cylinder 22, and a jacket connecting section 23 form a jacket body 2. Cooling water flows within the jacket body 2 to remove heat generated during the reaction, ensuring the reaction proceeds at a constant temperature. Temperature and pressure can be monitored during the reaction. In case of high pressure, high temperature, or other special conditions during the reaction, the first safety valve 134 and the second safety valve 25 act as protective devices. A nitrogen inlet 132 and a gas outlet 133 can discharge oxygen from the inner cylinder 1, meeting the production needs of various polyolefin products or polyolefin products with special functions, resulting in low production costs.

[0031] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0032] 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 indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0033] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0034] In this utility model, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

Claims

1. A polyolefin single-loop reactor, comprising an inner reaction cylinder and a jacket, characterized in that: The inner cylinder includes a first straight reaction tube, a second vertical reaction tube, a U-shaped bend, an L-shaped bend, and an axial flow pump. The two ends of the U-shaped bend are connected to the tops of the first and second vertical reaction tubes, respectively. The bottom of the first straight reaction tube has a slurry inlet. The U-shaped bend has a slurry outlet, a nitrogen inlet, a gas outlet, and a first safety valve port. One end of the L-shaped bend is connected to the bottom of the second vertical reaction tube, and the other end is connected to the pump outlet of the axial flow pump. The pump inlet of the axial flow pump is connected to the first vertical reaction tube. The bottom end of the straight reaction tube is connected, and the L-shaped bend is provided with a discharge port. The inner cylinder is provided with a thermometer port and a pressure gauge port. The jacket body includes a first jacket cylinder sleeved outside the first straight reaction tube, a second jacket cylinder sleeved outside the second vertical reaction tube, and a jacket connecting section connecting the first jacket cylinder and the second jacket cylinder. The bottom of the second jacket cylinder is provided with a chilled water inlet, and the bottom of the first jacket cylinder is provided with a chilled water outlet. The jacket body is provided with a jacket expansion joint, a second safety valve port, and a jacket vent port.

2. The polyolefin single-loop tube reactor as described in claim 1, characterized in that: The top and bottom of the first and second jacketed cylinders are respectively provided with reducing pipes.

3. A polyolefin single-loop tube reactor as described in claim 1, characterized in that: A connecting beam is provided between the first jacket cylinder and the second jacket cylinder.

4. A polyolefin single-loop tube reactor as described in claim 1, characterized in that: The first vertical reaction tube, the second vertical reaction tube, the U-shaped bend, and the L-shaped bend are all equipped with thermometer ports, and the second vertical reaction tube and the L-shaped bend are all equipped with pressure gauge ports.

5. A polyolefin single-loop tube reactor as described in claim 1, characterized in that: Both the first and second jacket cylinders are provided with jacket drain ports at their bottoms.

6. A polyolefin single-loop tube reactor as described in claim 1, characterized in that: Both the first and second jacketed cylinders are provided with ring seats at their bottoms.

7. A polyolefin single-loop tube reactor as described in claim 1, characterized in that: The first jacket cylinder, the second jacket cylinder, and the jacket connecting pipe are all equipped with jacket expansion joints.

8. A polyolefin single-loop tube reactor as described in claim 1, characterized in that: Both the first and second jacketed cylinders are provided with jacket exhaust ports at their tops.

9. A polyolefin single-loop tube reactor as described in claim 1, characterized in that: The second safety valve port is located on the jacket connection section.

10. A polyolefin single-loop tube reactor as described in claim 1, characterized in that: The L-shaped bend is equipped with a spare port.

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