A high premix reactor for producing butene-1

Abstract

The application discloses a butene-1 high premixing reactor for production, which comprises a reaction kettle body, an input assembly, a stirring device and the like. The input assembly comprises a first input assembly and a second input assembly which are arranged on the reaction kettle body and used for mixing ethylene and butene-1 to form a first mixed solution and mixing a catalyst and butene-1 to form a second mixed solution. The first input end of the first input assembly and the second input end of the second input assembly are oppositely arranged inside the reaction kettle body and used for making the first mixed solution and the second mixed solution to be opposite to each other to form a first solution. The stirring device is used for stirring the first solution. The first mixed solution formed by premixing ethylene and butene-1 in the first input assembly and the second mixed solution formed by premixing the catalyst and butene-1 in the second input assembly are stirred by the stirring device after being opposite to each other in the reaction kettle body, the mixing uniformity of the ethylene, butene-1 and the catalyst is greatly improved, the reaction efficiency is improved, and the production quality is improved.

Description

Technical Field

[0001] This disclosure relates to the field of chemical equipment technology, specifically to a high-premixed reactor for the production of butene-1. Background Technology

[0002] The reaction between ethylene and butene-1 is an organic chemical reaction. The most important reaction between them is through olefin metathesis. Olefin metathesis is an important modern petrochemical technology in which ethylene and butene-1 undergo cross-metathesis to produce propylene under the action of metal carbene or metal oxide catalysts (such as compounds of tungsten, molybdenum, and rhenium). This is one of the key processes for increasing the production of high-value propylene and optimizing the balance of the olefin industry chain.

[0003] In existing industrial plants, this reaction is typically carried out in a three-phase fixed-bed reactor or a trickle-bed reactor. A typical process flow is as follows: gaseous ethylene and liquid butene-1 are fed through a feed system and initially mixed, usually through a simple T-junction or Y-type mixer. Subsequently, the mixture is initially dispersed by the kinetic energy of the fluid itself or through a static mixer. Finally, the mixture enters from the top of the reactor and flows downward through the solid catalyst bed.

[0004] Because ethylene is in the gaseous phase under reaction conditions, with low density and viscosity, while butene-1 is in the liquid phase, with high density and viscosity, simple pipeline mixing or inefficient static mixers cannot provide sufficient shear force to fully break up and disperse the gaseous bubbles in the continuous liquid phase. This causes ethylene gas to enter the reactor as large bubbles (rather than fine bubbles) along with the butene-1 liquid, resulting in severe phase separation and seriously affecting production quality. Utility Model Content

[0005] In view of the above-mentioned defects or deficiencies in the prior art, it is desirable to provide a high premixed reactor for the production of butene-1.

[0006] This application discloses a high-premixed reactor for the production of butene-1, comprising: A reaction vessel body, wherein the reaction vessel body contains a first solution; The input device includes a first input component and a second input component, which are symmetrically arranged at the bottom of the reactor body. The first input component is used to input ethylene and butene-1 and mix them to form a first mixed solution, which is then transported into the reactor body. The second input component is used to input catalyst and butene-1 and mix them to form a second mixed solution, which is then transported into the reactor body. The first input component and the second input component each have a first input terminal and a second input terminal. The first input terminal and the second input terminal both extend into the interior of the reactor body and are arranged opposite to each other to allow the first mixed solution and the second mixed solution to be flushed to form the first solution. A stirring device is movably disposed inside the reaction vessel body and is used to stir the first solution.

[0007] According to the technical solution provided in the embodiments of this application, the first input component includes a first input tube, one end of the first input tube is located outside the reactor body and has a first input port for inputting butene-1, and the other end of the first input tube is located inside the reactor body to form the first input end; The first input tube is provided with multiple second input ports for inputting the ethylene.

[0008] According to the technical solution provided in the embodiments of this application, the first input tube has a mixing section, the mixing section including a contraction section and an expansion section arranged along a direction away from the first input port, and a throat is formed between the contraction section and the expansion section; Multiple second input ports are arranged circumferentially on the throat, and the second input ports are connected to the throat through input channels.

[0009] According to the technical solution provided in the embodiments of this application, the throat section is rectangular, and its height is less than its width.

[0010] According to the technical solution provided in the embodiments of this application, the inner wall of the throat is provided with mixing teeth, which are used to puncture the air bubbles in the first mixed solution; The inner wall of the throat is also provided with grooves to generate local eddies.

[0011] According to the technical solution provided in the embodiments of this application, the stirring device includes: A stirring shaft is rotatably disposed inside the reactor body and is coaxially disposed with the reactor body; The first stirring paddle is fixedly mounted on the stirring shaft and close to the bottom end of the stirring shaft, and is used to stir the first solution radially along the body of the reaction vessel. The second stirring paddle is fixedly mounted on the stirring shaft and located above the first stirring paddle, and is used to stir the first solution along the axial direction of the reactor body.

[0012] According to the technical solution provided in the embodiments of this application, a piercing part is provided at the bottom of the stirring shaft. The piercing part is located between the first input end and the second input end. The piercing part includes a fixing member, and the side wall of the fixing member is provided with spikes for piercing air bubbles.

[0013] According to the technical solution provided in the embodiments of this application, a heat exchange device is also included, the heat exchange device comprising: A refrigerant inlet pipe, one end of which is located outside the reactor body and has a refrigerant inlet, and the other end of which is located inside the reactor body; A refrigerant outlet pipe, one end of which is located outside the reactor body and has a refrigerant outlet, and the other end of which is located inside the reactor body; The heat exchange tubes are multiple in number and arranged radially along the reactor body. The two ends of the heat exchange tubes are respectively connected to the end of the refrigerant inlet pipe located inside the reactor body and the end of the refrigerant outlet pipe located inside the reactor body.

[0014] According to the technical solution provided in the embodiments of this application, the reactor body is further provided with a detection interface for installing a temperature detection device, which is used to detect the temperature of the first solution.

[0015] According to the technical solution provided in the embodiments of this application, the second input component includes a second input tube, one end of which is located outside the reactor body and has a third input port for inputting butene-1, and the other end of which is located inside the reactor body to form the second input end; The second input tube is provided with multiple fourth input ports for inputting the catalyst.

[0016] In summary, this technical solution specifically discloses a high-premixed reactor for producing butene-1, comprising a reactor body containing a first solution; the input components include a first input component and a second input component symmetrically arranged at the bottom of the reactor body, the first input component being used to input ethylene and butene-1 and mix them to form a first mixed solution which is then transported into the reactor body, the second input component being used to input a catalyst and butene-1 and mix them to form a second mixed solution which is then transported into the reactor body, the first input component and the second input component respectively having a first input end and a second input end, both of which extend into the reactor body and are arranged opposite to each other, for flushing the first mixed solution and the second mixed solution to form the first solution; a stirring device is movably arranged inside the reactor body for stirring the first solution; Ethylene and butene-1 are premixed inside the first input component to form a first mixed solution, and the catalyst and butene-1 are premixed inside the second input component to form a second mixed solution. After the first and second mixed solutions are offset, they are stirred by a stirring device, which greatly improves the mixing uniformity of ethylene, butene-1 and catalyst, improves reaction efficiency and enhances production quality. Attached Figure Description

[0017] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 This is a schematic diagram of a high-premixed reactor for the production of butene-1.

[0018] Figure 2 This is a schematic diagram of the mixing section.

[0019] The following are the labels in the diagram: 1. Reactor body; 2. First input pipe; 3. First input port; 4. Second input port; 5. Contraction section; 6. Expansion section; 7. Throat; 8. Input channel; 9. Mixing teeth; 10. Groove; 11. Stirring shaft; 12. First stirring paddle; 13. Second stirring paddle; 14. Refrigerant input port; 15. Refrigerant output port; 16. Heat exchange tube; 17. Detection interface; 18. Second input pipe; 19. Third input port; 20. Fourth input port; 21. Material outlet. Detailed Implementation

[0020] The present application 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 merely illustrative of the relevant utility model and not intended to limit the scope of the utility model. Furthermore, it should be noted that, for ease of description, only the parts relevant to the utility model are shown in the accompanying drawings.

[0021] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0022] Please refer to Figure 1 and Figure 2 A high-premixed reactor for producing butene-1, comprising: The reaction vessel body 1 contains a first solution inside; The input device includes a first input component and a second input component. The first input component and the second input component are symmetrically arranged at the bottom end of the reactor body 1. The first input component is used to input ethylene and butene-1 and mix them to form a first mixed solution, which is then transported into the reactor body 1. The second input component is used to input catalyst and butene-1 and mix them to form a second mixed solution, which is then transported into the reactor body 1. The first input component and the second input component have a first input end and a second input end, respectively. The first input end and the second input end both extend into the interior of the reactor body 1 and are arranged opposite to each other, so as to flush the first mixed solution and the second mixed solution to form a first solution. A stirring device is movably installed inside the reactor body 1 to stir the first solution.

[0023] Specifically, the first input component and the second input component are symmetrically arranged at the bottom end of the reactor body 1, and both the first input end and the second input end extend to the reactor body 1 and are arranged opposite to each other; wherein the first input component is used to input ethylene and butene-1 and mix the two to form a first mixed solution, and the second input component is used to input catalyst and butene-1 and mix the two to form a second mixed solution; Therefore, ethylene and butene-1 are fed into the first input component for premixing to form a first mixed solution, and the catalyst and butene-1 are fed into the second input component for premixing to form a second mixed solution. Since the first and second input ends are arranged opposite to each other, the first and second mixed solutions are counteracted and mixed again to form the first solution. Then, the first solution is stirred by a stirring device to make the ethylene, butene-1 and catalyst more fully mixed, effectively improving the reaction efficiency and thus improving the production quality.

[0024] It should be noted that butene-1 is a liquid, ethylene is a gas, and the catalyst is a liquid.

[0025] Furthermore, the first input component includes a first input pipe 2, one end of which is located outside the reactor body 1 and has a first input port 3 for inputting butene-1, and the other end of which is located inside the reactor body 1 to form a first input end; The first input pipe 2 is provided with multiple second input ports 4 for inputting ethylene.

[0026] The first input pipe 2 can be arranged radially along the reactor body 1, with butene-1 being transported from the first input port 3 into the first input pipe 2, and ethylene being input from the second input port 4 into the first input pipe 2.

[0027] Furthermore, the second input component includes a second input pipe 18, one end of which is located outside the reactor body 1 and has a third input port 19 for inputting butene-1, and the other end of which is located inside the reactor body 1 to form a second input end. A fourth input port 20 is provided on the second input pipe 18 for inputting catalyst. Optionally, the first input pipe 2 and the second input pipe 18 are coaxially arranged.

[0028] Furthermore, the first input pipe 2 has a mixing section, which includes a contraction section 5 and an expansion section 6 arranged in a direction away from the first input port 3, and a throat 7 is formed between the contraction section 5 and the expansion section 6; Multiple second input ports 4 are arranged circumferentially on the throat 7, and the second input ports 4 are connected to the throat 7 through input channels 8.

[0029] Specifically, the inner diameter of the contraction section 5, which is closer to the first inlet 3 than the expansion section 6, gradually decreases in the direction away from the first inlet 3. According to Bernoulli's law, when the pipe cross-section narrows, the fluid velocity increases while the pressure decreases. Thus, the flow velocity of butene-1 increases when it flows through the contraction section 5 and the throat 7. At the same time, since butene-1 is a liquid and ethylene is a gas, bubbles will be generated when the gas and liquid are mixed. The flow velocity of the first mixed solution increases when it passes through the throat 7, and the turbulent kinetic energy (TKE) is enhanced. The high shear force can be used to break up the bubbles and improve the mixing efficiency of ethylene and butene-1. Multiple second inlet ports 4 are arranged around the throat 7 to avoid excessively high local gas content.

[0030] Optionally, the first input tube 2 is a Venturi tube.

[0031] Furthermore, the throat section 7 has a rectangular cross-section, with its height being less than its width.

[0032] Specifically, it can be a rectangular or near-rectangular flat shape with a height much smaller than its width. This shape can more effectively generate uniform and strong shear force, thereby greatly improving the bubble breaking effect. The rate of change of flow velocity in space is called the shear rate. The higher the shear rate, the greater the velocity difference between adjacent flow layers, and the stronger the "tearing" force acting on the bubble.

[0033] Bubble breakup requires overcoming its surface tension. The main external force applied to the bubble comes from the shear force of the surrounding liquid; rectangular cross-sections, especially flat cross-sections, have a natural advantage in generating high shear rates. When the height is very small, the entire flow field can be approximated as a two-dimensional planar Poiseuille flow. Its velocity profile is parabolic, but because of its flat structure, the high-shear region (near the upper and lower walls) occupies most of the flow field volume. This means that a bubble, regardless of its location in the flow field, has a very high probability of being in a region with a high shear rate.

[0034] Furthermore, the inner wall of the throat 7 is provided with mixing teeth 9, which are used to puncture air bubbles in the first mixed solution; The inner wall of the throat 7 is also provided with grooves 10 to generate local eddies.

[0035] In this process, by setting up mixing teeth 9, when the first mixed solution containing bubbles passes through the throat 7, the bubbles collide with the mixing teeth 9 and break down, thereby improving the mixing uniformity of ethylene and butene-1. By providing a groove 10 on the inner wall of the throat 7, when the first mixed solution passes through the groove 10, the inner wall of the groove 10 guides the first mixed solution, thereby forming a local vortex. The vortex impacts the flowing first mixed solution, causing the bubbles to break up again, further improving the mixing uniformity of ethylene and butene-1.

[0036] Optionally, the inner wall of the expansion section 6 may also be provided with mixing teeth 9 and grooves 10.

[0037] Furthermore, the stirring device includes: A stirring shaft 11 is rotatably disposed inside the reactor body 1 and is coaxially disposed with the reactor body 1. The first stirring paddle 12 is fixedly mounted on the stirring shaft 11 and close to the bottom end of the stirring shaft 11, and is used to stir the first solution radially along the reactor body 1. The second stirring paddle 13 is fixedly mounted on the stirring shaft 11 and located above the first stirring paddle 12, and is used to stir the first solution along the axial direction of the reactor body 1.

[0038] Specifically, the stirring shaft 11 is rotatably disposed inside the reactor body 1, preferably coaxially disposed with the reactor body 1; the first stirring paddle 12 is fixedly disposed on the stirring shaft 11, and the rotation of the stirring shaft 11 drives the first stirring paddle 12 to rotate. The first stirring paddle 12 can be a flat plate structure, the purpose of which is to push the first solution to move radially along the reactor body 1; two sets of second stirring paddles 13 are disposed, arranged on the stirring shaft 11, and both are located above the first stirring paddle 12. The second stirring paddle 13 can be a twisted curved blade. Driven by the stirring shaft 11, the rotation of the second stirring paddle 13 can stir the first solution to move axially along the reactor body 1. By cooperating with the first stirring paddle 12 and the second stirring paddle 13, the flow direction of the first solution inside the reactor body 1 is circulated. The second stirring paddle 13 stirs the first solution located in the upper part of the reactor body 1 towards the first stirring paddle 12. The first stirring paddle 12 pushes the first solution from the second stirring paddle 13 radially towards the inner wall of the reactor body 1, thereby forming a circulating stirring, which improves the mixing uniformity of ethylene, butene-1 and catalyst.

[0039] Furthermore, the bottom of the stirring shaft 11 is provided with a piercing part, which is located between the first input end and the second input end. The piercing part includes a fixing member, and the side wall of the fixing member is provided with spikes for piercing air bubbles.

[0040] Specifically, the fixing member is fixedly installed at the bottom end of the stirring shaft 11 and is located between the first input end and the second input end, forming an opposing space between the first input end and the second input end, and the side wall of the fixing member is provided with spikes; When the first input end delivers the first mixed solution and the second input end delivers the second mixed solution into the reactor body 1, the first and second mixed solutions collide in the opposing space, breaking the bubbles once. Then, due to the rotation of the piercing part driven by the stirring shaft 11, the bubbles float up and collide with the spikes, thus being pierced by the spikes, achieving the purpose of breaking the bubbles once, and improving the mixing uniformity of ethylene, butene-1 and catalyst.

[0041] Furthermore, it also includes a heat exchange device, which includes: The refrigerant inlet pipe has one end located outside the reactor body 1 and has a refrigerant inlet 14, and the other end located inside the reactor body 1. The refrigerant outlet pipe has one end located outside the reactor body 1 and has a refrigerant outlet 15, and the other end located inside the reactor body 1. The heat exchange tubes 16 are multiple and arranged radially along the reactor body 1. The two ends of the heat exchange tubes 16 are respectively connected to the end of the refrigerant inlet pipe located inside the reactor body 1 and the end of the refrigerant outlet pipe located inside the reactor body 1.

[0042] Specifically, the refrigerant is delivered from the refrigerant inlet 14 to the refrigerant inlet pipe, and then enters multiple heat exchange tubes 16 to achieve heat exchange with the first solution and cool the first solution. The refrigerant after heat exchange is output from the refrigerant outlet 15, and the temperature of the first solution is reduced by the heat exchange device to avoid damage to the reactor body 1 due to excessive temperature.

[0043] Furthermore, the reactor body 1 is also provided with a detection interface 17 for installing a temperature detection device, which is used to detect the temperature of the first solution.

[0044] Specifically, the detection interface 17 is connected to the interior of the reaction vessel body 1. The temperature detection element is installed in the detection interface 17, which can detect the temperature of the first solution in real time, so as to facilitate the staff to determine whether to start the heat exchange device.

[0045] Furthermore, the material outlet 21 on the reactor body 1 is used to output the material after ethylene and butene-1 have fully reacted.

[0046] Working principle: Butene-1 is input into the first input pipe 2 through the first input port 3, and ethylene is input into the first input pipe 2 through the second input port 4. They mix in the throat 7 to form a first mixed solution. Due to the setting of the contraction section 5 and the throat 7, the flow rate of the first mixed solution is accelerated. At the same time, mixing teeth 9 are set in the inner wall of the throat 7 to break up the bubbles. Also, due to the grooves 10 on the inner wall of the throat 7, the first mixed solution generates local eddies when passing through the grooves 10, which impact the flowing first mixed solution and break up the bubbles again. Furthermore, because the flow rate is accelerated at the throat 7, and the cross-section of the throat 7 is a rectangle with a height less than its width, the high shear force breaks up the bubbles, improving the mixing uniformity of ethylene and butene-1. Thus, ethylene and butene-1 can be fully premixed inside the first input pipe 2. Butene-1 and the catalyst are fed into the second input pipe 18 through the third input port 19 and the fourth input port 20, respectively, to form a second mixed solution. Inside the reactor body 1, the first mixed solution is fed into the first input end and the second mixed solution is fed into the second input end. The first mixed solution and the second mixed solution collide in the opposing space, breaking the bubbles again. At the same time, the spikes of the piercing part can also pierce the bubbles through the rotation of the stirring shaft 11, further improving the mixing uniformity of ethylene, butene-1 and catalyst, and improving the reaction efficiency. Furthermore, through the rotation of the stirring shaft 11, the second stirring paddle 13 stirs the first solution located on the upper part of the reactor body 1 towards the first stirring paddle 12, and the first stirring paddle 12 stirs the first solution towards the inner wall of the reactor body 1, forming a flow circulation. Through the stirring action of the stirring device, the mixing uniformity of ethylene, butene-1 and catalyst is further improved, and the production quality is improved.

[0047] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the utility model involved in this application is not limited to the technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A high-premixed reactor for producing butene-1, characterized in that, include: The reactor body (1) contains a first solution inside; The input device includes a first input component and a second input component. The first input component and the second input component are symmetrically arranged at the bottom end of the reactor body (1). The first input component is used to input ethylene and butene-1 and mix them to form a first mixed solution and deliver it into the reactor body (1). The second input component is used to input catalyst and butene-1 and mix them to form a second mixed solution and deliver it into the reactor body (1). The first input component and the second input component have a first input end and a second input end, respectively. The first input end and the second input end both extend into the interior of the reactor body (1) and are arranged opposite to each other, so as to flush the first mixed solution and the second mixed solution to form the first solution; A stirring device is movably disposed inside the reactor body (1) for stirring the first solution.

2. The high-premixed reactor for producing butene-1 according to claim 1, characterized in that, The first input component includes a first input tube (2), one end of which is located outside the reactor body (1) and has a first input port (3) for inputting butene-1, and the other end of which is located inside the reactor body (1) to form the first input end; The first input tube (2) is provided with a plurality of second input ports (4) for inputting the ethylene.

3. The high-premixed reactor for producing butene-1 according to claim 2, characterized in that, The first input tube (2) has a mixing section, which includes a constriction section (5) and an expansion section (6) arranged in a direction away from the first input port (3), and a throat (7) is formed between the constriction section (5) and the expansion section (6). Multiple second input ports (4) are arranged circumferentially on the throat (7), and the second input ports (4) are connected to the throat (7) through input channels (8).

4. A high-premixed reactor for producing butene-1 according to claim 3, characterized in that, The throat (7) has a rectangular cross-section, and its height is less than its width.

5. A high-premixed reactor for producing butene-1 according to claim 3, characterized in that, The throat (7) is provided with mixing teeth (9) on its inner wall, which are used to puncture the air bubbles in the first mixed solution; The inner wall of the throat (7) is also provided with grooves (10) for generating local eddies.

6. A high-premixed reactor for producing butene-1 according to claim 1, characterized in that, The stirring device includes: A stirring shaft (11) is rotatably disposed inside the reactor body (1) and is coaxially disposed with the reactor body (1); The first stirring paddle (12) is fixedly mounted on the stirring shaft (11) and close to the bottom end of the stirring shaft (11) for stirring the first solution radially along the reactor body (1); The second stirring paddle (13) is fixedly mounted on the stirring shaft (11) and located above the first stirring paddle (12) to stir the first solution along the axial direction of the reactor body (1).

7. A high-premixed reactor for producing butene-1 according to claim 1, characterized in that, The bottom of the stirring shaft (11) is provided with a piercing part, which is located between the first input end and the second input end. The piercing part includes a fixing member, and the side wall of the fixing member is provided with spikes for piercing air bubbles.

8. A high-premixed reactor for producing butene-1 according to claim 1, characterized in that, It also includes a heat exchange device, which comprises: A refrigerant inlet pipe, one end of which is located outside the reactor body (1) and has a refrigerant inlet (14), and the other end is located inside the reactor body (1); A refrigerant outlet pipe, one end of which is located outside the reactor body (1) and has a refrigerant outlet (15), and the other end is located inside the reactor body (1); Heat exchange tubes (16), there are multiple heat exchange tubes (16) arranged radially along the reactor body (1), and the two ends of the heat exchange tubes (16) are respectively connected to the end of the refrigerant inlet pipe located inside the reactor body (1) and the end of the refrigerant outlet pipe located inside the reactor body (1).

9. A high-premixed reactor for producing butene-1 according to claim 1, characterized in that, The reactor body (1) is also provided with a detection interface (17) for installing a temperature detection device, which is used to detect the temperature of the first solution.

10. A high-premixed reactor for producing butene-1 according to claim 1, characterized in that, The second input component includes a second input tube (18), one end of which is located outside the reactor body (1) and has a third input port (19) for inputting butene-1, and the other end of which is located inside the reactor body (1) to form the second input end; The second input tube (18) is provided with a plurality of fourth input ports (20) for inputting the catalyst.

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