Reaction system for producing 1-butene through ethylene dimerization

Abstract

The invention provides a reaction system for producing 1-butene by ethylene dimerization, which comprises: a reaction kettle, which is internally provided with an accommodating cavity, and is provided with a feed port, a discharge port and a discharge port which are communicated with the accommodating cavity, the discharge port is communicated with a discharge pipe, the discharge pipe is provided with a discharge valve, the discharge port is communicated with a discharge pipe, and the discharge pipe is provided with a discharge valve; a first inlet of the first feeding mixer is communicated with a solvent feeding pipe, and a second inlet of the first feeding mixer is communicated with an ethylene feeding pipe; a first inlet of the second feeding mixer is communicated with an outlet of the first feeding mixer, a second inlet of the second feeding mixer is communicated with an auxiliary feeding pipe, and a third inlet of the second feeding mixer is communicated with a cocatalyst feeding pipe; a first inlet of the third feeding mixer is communicated with an outlet of the second feeding mixer, and a second inlet of the third feeding mixer is communicated with a main catalyst feeding pipe; an inlet of the mixed feeding header pipe is communicated with an outlet of the third feeding mixer, an outlet is communicated with the feeding port, and the mixed feeding header pipe is tangent to the inner wall of the reaction kettle; the heating device is arranged in the circumferential direction of the reaction kettle; the cooling device is arranged in the circumferential direction of the reaction kettle.

Description

Technical Field

[0001] The invention relates to the technical field of preparing 1-butene from ethylene, and in particular to a reaction system for producing 1-butene through dimerization of ethylene. Background Art

[0002] The application of 1-butene in the fields of high-performance polyolefins, high-end synthetic lubricants, high-carbon alcohols, etc. is increasing, and its demand continues to grow. Ethylene dimerization is one of the main methods for producing high-purity high-grade 1-butene, among which the use of suitable production equipment is an important way to increase the yield of 1-butene produced by ethylene dimerization. In the prior art, a stirring device is set in the reactor. During the reaction process, the materials are mixed evenly with the help of continuous stirring of the stirring device, which promotes the stable reaction. However, the polymer produced during the reaction will adhere to the stirring device, and based on this, as the reaction proceeds, it further leads to the aggregation of by-products, affecting the overall mixing, mass transfer and heat transfer of the materials in the reactor, and ultimately having an adverse effect on the yield of 1-butene. Summary of the invention

[0003] In view of this, the present invention provides a reaction system for producing 1-butene by ethylene dimerization to solve the above technical problems.

[0004] The reaction system for producing 1-butene by ethylene dimerization provided by the present invention comprises:

[0005] A reaction kettle, wherein a containing chamber is provided in the reaction kettle, and a feed port, a discharge port and a discharge port connected to the containing chamber are provided, the discharge port is connected to a discharge pipe, a discharge valve is installed on the discharge pipe, the discharge port is connected to a discharge pipe, and a discharge valve is installed on the discharge pipe;

[0006] A first feed mixer, wherein a first inlet of the first feed mixer is connected to a solvent feed pipe, and a second inlet of the first feed mixer is connected to an ethylene feed pipe;

[0007] A second feed mixer, wherein the first inlet of the second feed mixer is connected to the outlet of the first feed mixer through a first connecting pipe, the second inlet of the second feed mixer is connected to the auxiliary agent feed pipe, and the third inlet of the second feed mixer is connected to the co-catalyst feed pipe;

[0008] A third feed mixer, wherein a first inlet of the third feed mixer is connected to an outlet of the second feed mixer via a second connecting pipe, and a second inlet of the third feed mixer is connected to a main catalyst feed pipe;

[0009] A mixing feed main pipe, the inlet of which is connected to the outlet of the third feed mixer, the outlet of which is connected to the feed port, and is arranged tangent to the inner wall of the reactor;

[0010] Feed valves are installed on the solvent feed pipe, the ethylene feed pipe, the additive feed pipe, the co-catalyst feed pipe, the main catalyst feed pipe and the mixed feed main pipe respectively;

[0011] A heating device, the heating device is arranged around the reactor;

[0012] A cooling device is arranged around the reactor.

[0013] Optionally, the ethylene dimerization production 1-butene reaction system further comprises:

[0014] An air intake pipe, the air intake pipe passes through the reactor and is connected to the accommodating chamber, and an air intake valve is installed on the air intake pipe;

[0015] An exhaust pipe runs through the reactor and is connected to the accommodating chamber. An exhaust valve is installed on the exhaust pipe.

[0016] Optionally, the ethylene dimerization production 1-butene reaction system further comprises:

[0017] an oxygen concentration meter installed on the exhaust pipe;

[0018] A controller, wherein an input end of the controller is communicatively connected to an output end of the oxygen concentration meter, and an output end of the controller is communicatively connected to control ends of the intake valve and the exhaust valve.

[0019] Optionally, the ethylene dimerization reaction system for producing 1-butene further includes: a pressure relief pipe, which runs through the reactor and is connected to the containing chamber, and a pressure relief valve is installed on the pressure relief pipe.

[0020] Optionally, the ethylene dimerization production 1-butene reaction system further comprises:

[0021] An on-site pressure gauge, which monitors and displays the pressure in the reactor;

[0022] A remote pressure gauge, the remote pressure gauge monitoring the pressure in the reactor;

[0023] The input end of the controller is communicatively connected to the output end of the remote pressure gauge, and the output end of the controller is communicatively connected to the control end of the pressure relief valve.

[0024] Optionally, the inner diameter of the outlet side of the mixed feed main pipe is smaller than the inner diameter of the inlet side thereof; and the angle between the mixed feed main pipe and the horizontal plane is 0-60°.

[0025] Optionally, the ethylene dimerization reaction system for producing 1-butene further comprises: a safety pipe, which runs through the reactor and is connected to the containing chamber, and a safety valve and a bursting disc are installed in the safety pipe.

[0026] Optionally, the ethylene dimerization production 1-butene reaction system further comprises:

[0027] A liquid phase thermometer, which monitors the temperature of the liquid in the reactor;

[0028] The input end of the controller is communicatively connected to the output end of the liquid phase thermometer, and the output end of the controller is communicatively connected to the control ends of the heating device and the cooling device.

[0029] Optionally, the ethylene dimerization production 1-butene reaction system further comprises:

[0030] A plurality of ethylene feed side lines, each of which runs through the reactor and is arranged tangentially to the inner wall of the reactor, and each of which is equipped with a regulating valve and a flow meter;

[0031] The input end of the controller is communicatively connected to the output end of each of the flow meters, and the output end of the controller is communicatively connected to the control end of each of the regulating valves.

[0032] Optionally, the solvent feed pipe, the ethylene feed pipe, the additive feed pipe, the co-catalyst feed pipe, the main catalyst feed pipe and the mixed feed main pipe are respectively installed with a check valve.

[0033] Compared with the prior art, the above technical solution provided by the present invention has at least the following beneficial effects:

[0034] According to the ethylene dimerization reaction system for producing 1-butene, a stirring device is abandoned in the reactor, equipment components in the reactor are reduced, equipment complexity and manufacturing difficulty are reduced, and manufacturing cost is reduced. The mixed material enters tangentially along the inner wall of the reactor, and the impact force of the mixed material itself is used to provide power for mass transfer and heat transfer. The material is stirred uniformly while ensuring uniform heating, and the reaction process is continuous and stable, saving the electric energy consumed by the stirring device, avoiding the adhesion of polymers produced by the reaction on the stirring device to cause the aggregation of by-products, improving the equipment operation cycle, and improving the output and yield of 1-butene. In addition, three feed mixers are used to mix various materials in batches before entering the reactor, which is conducive to fully mixing the materials and saving the mixing time in the reactor. The main catalyst is added last, so that other materials are simply mixed before entering the reactor, and only start to react after entering the reactor and under suitable temperature conditions, thereby avoiding the waste of the main catalyst. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 A schematic diagram of a reaction system for producing 1-butene by ethylene dimerization according to an embodiment of the present invention;

[0036] Figure 2 for Figure 1 A top view of a reaction system for producing 1-butene by ethylene dimerization is shown;

[0037] Figure 3 for Figure 1 The shown diagram is a top view of the ethylene dimerization reaction system for producing 1-butene connected to an ethylene feed side line.

[0038] Reference numerals:

[0039] 1: Reactor; 2: First feed mixer; 3: Second feed mixer; 4: Third feed mixer; 5: Mixing feed main pipe; 6: Heating device; 61: Heating liquid inlet pipe; 62: Heating liquid outlet pipe; 7: Cooling device; 71: Cooling liquid inlet pipe; 72: Cooling liquid outlet pipe; 8: Discharge pipe; 9: Discharge valve; 10: Discharge pipe; 11: Discharge valve; 12: Solvent feed pipe; 13: Ethylene feed pipe; 14: First connecting pipe; 15: Auxiliary agent feed pipe; 16: Catalyst feed pipe ; 17: second connecting pipe; 18: main catalyst feed pipe; 19: feed valve; 20: air intake pipe; 21: exhaust pipe; 22: air intake valve; 23: exhaust valve; 24: pressure relief pipe; 25: pressure relief valve; 26: on-site pressure gauge; 27: remote pressure gauge; 28: safety pipe; 29: safety valve; 30: bursting disc; 31: liquid phase thermometer; 32: gas phase thermometer; 33: ethylene feed sub-line; 34: regulating valve; 35: flow meter; 36: ethylene feed main line; 37: check valve. DETAILED DESCRIPTION

[0040] The embodiments of the present invention will be further described below in conjunction with the accompanying drawings. In the description of the present invention, it should be noted that the orientations or positional relationships indicated by the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only simplified descriptions for the convenience of describing the present invention, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0041] Figure 1 A schematic diagram of a reaction system for producing 1-butene by ethylene dimerization according to an embodiment of the present invention; Figure 2 for Figure 1The top view of the reaction system for producing 1-butene by ethylene dimerization is shown in FIG. Figure 1 and Figure 2 As shown, the reaction system for producing 1-butene by ethylene dimerization includes a reactor 1, a first feed mixer 2, a second feed mixer 3, a third feed mixer 4, a mixed feed main pipe 5, a heating device 6 and a cooling device 7.

[0042] The reactor 1 is provided with a containing chamber, and is provided with a feed port, a discharge port and a discharge port connected to the containing chamber, the discharge port is connected to a discharge pipe 8, a discharge valve 9 is installed on the discharge pipe 8, the discharge port is connected to a discharge pipe 10, a discharge valve 11 is installed on the discharge pipe 10; the first inlet of the first feed mixer 2 is connected to a solvent feed pipe 12, the second inlet of the first feed mixer 2 is connected to an ethylene feed pipe 13; the first inlet of the second feed mixer 3 is connected to the outlet of the first feed mixer 2 through a first connecting pipe 14, the second inlet of the second feed mixer 3 is connected to an auxiliary agent feed pipe 15, and the third inlet of the second feed mixer 3 is connected to a co-catalyst feed pipe 16; the first inlet of the third feed mixer 4 is connected to the outlet of the second feed mixer 3 through the second connecting pipe 17, and the second inlet of the third feed mixer 4 is connected to the main catalyst feed pipe 18; the inlet of the mixed feed main pipe 5 is connected to the outlet of the third feed mixer 4, and the outlet of the mixed feed main pipe 5 is connected to the feed port, and is arranged tangent to the inner wall of the reactor 1; the solvent feed pipe 12, the ethylene feed pipe 13, the auxiliary agent feed pipe 15, the auxiliary catalyst feed pipe 16, the main catalyst feed pipe 18 and the mixed feed main pipe 5 are respectively installed with feed valves 19; the heating device 6 is arranged around the reactor 1; the cooling device 7 is arranged around the reactor 1.

[0043] When in use, start the heating device 6 and open the feed valves 19 on each feed pipe, then the solvent enters the first feed mixer 2 through the solvent feed pipe 12, and ethylene enters the first feed mixer 2 through the ethylene feed pipe 13. After the two are mixed in the first feed mixer 2, they enter the second feed mixer 3 through the first connecting pipe 14. At the same time, the auxiliary agent enters the second feed mixer 3 through the auxiliary agent feed pipe 15, and the co-catalyst enters the second feed mixer 3 through the co-catalyst feed pipe 16. After the three are mixed in the second feed mixer 3, they enter the third feed mixer 4 through the second connecting pipe 17. At the same time, the main catalyst enters the third feed mixer 4 through the main catalyst feed pipe 18. After the two are mixed in the third feed mixer 4, they enter the reactor 1 through the mixed feed main pipe 5. The mixed feed main pipe 5 is arranged tangentially to the inner wall of the reactor 1. When the mixed material enters the reactor 1, an impact force is generated in the tangential direction. The mixed material that enters later drives the mixed material that enters earlier in the reactor 1 to rotate, promoting the mass transfer and heat transfer of the mixed material, so that the mixed material can be heated evenly and fully mixed in the reactor 1. As the mixed material is continuously added and the reaction continues, the discharge valve 9 on the discharge pipe 8 is opened. When the liquid level of the mixed material rises to the discharge port, the reaction is completed, and the mixed material is discharged through the discharge pipe 8 and collected. The reaction process is accompanied by heat release. Therefore, the temperature in the reactor 1 will become higher and higher. As the reaction proceeds, the heating power of the heating device 6 can be appropriately reduced. When the reaction is carried out for a certain period of time and the temperature in the reactor 1 rises to a certain degree, the heating device 6 can be turned off, and the cooling device 7 can be turned on at the same time to cool down the reactor 1 to ensure that the temperature in the reactor 1 is maintained within a temperature range suitable for stable reaction. When the output of 1-butene meets the demand, the feed valves 19 on each feed pipe are closed, and only the feed valve 19 on the solvent feed pipe 12 is opened. The solvent is continuously injected to make the remaining mixed solution in the reactor 1 fully react and generate products, and the liquid level continues to rise and is discharged through the discharge pipe 8. When it is judged based on experience that the mixed materials in the reactor 1 have completed the reaction and are discharged, and only the solvent remains in the reactor 1, the discharge valve 11 is opened, and the residual solvent in the reactor 1 is discharged through the discharge pipe 10. After the system has been running for a period of time, when the reactor 1 needs to be heated and washed, the cooling device 7 can be shut down, the heating system can be started, the reactor 1 can be hot-washed, the polymer in the reactor 1 can be dissolved and removed, and after a period of hot washing, the solution in the reactor 1 is discharged through the discharge pipe 10, and the reactor 1 is in a standby state.

[0044] In the reaction system for producing 1-butene by ethylene dimerization of the present invention, a stirring device is abandoned in the reactor 1, equipment components in the reactor 1 are reduced, the complexity of the equipment and the difficulty of manufacturing are reduced, and the manufacturing cost is reduced. The mixed material enters tangentially along the inner wall of the reactor 1, and the impact force of the mixed material itself is used to provide the power of mass transfer and heat transfer. The material is stirred evenly while ensuring uniform heating, and the reaction process is continuous and stable, saving the electric energy consumed by the stirring device, avoiding the adhesion of polymers produced by the reaction on the stirring device to cause the aggregation of by-products, improving the equipment operation cycle, and improving the output and yield of 1-butene. In addition, three feed mixers are used to mix various materials in batches before entering the reactor 1, which is conducive to fully mixing the materials and saving the mixing time in the reactor 1. The main catalyst is added last, so that other materials are simply mixed before entering the reactor 1, and only start to react after entering the reactor 1 and under suitable temperature conditions, thereby avoiding the waste of the main catalyst.

[0045] like Figure 1 and Figure 2 As shown, in this embodiment, the reactor 1 is composed of a lower reactor body and an upper reactor cover connected by a flange, and the two enclose a containing cavity for the reaction. The interface between the reactor body and the reactor cover that contacts the material is treated with anti-sticking treatment, including but not limited to the selection of PTFE lining treatment, enamel lining treatment, coating treatment and polishing treatment to reduce polymer adhesion and other surface treatments. Figure 1The feed inlet of the reactor 1 is opened at the lower end on the left side, the discharge port is opened at the middle of the right side, and the discharge port is opened at the center of the bottom. The reactor 1 can be made of metal, glass, enamel, alloy and other materials, preferably stainless steel. The discharge pipe 8 can be arranged at 1 / 4 to 4 / 5 of the height of the kettle body, and the discharge pipe 8 is connected to the receiving tank to collect the reaction product. The discharge pipe 8 can also be provided with an external heating and insulation device, and the heating form includes but is not limited to a heating line, a jacket, etc., to prevent the polymer from cooling and agglomerating at the discharge pipe 8 and blocking the discharge pipe 8. The first feed mixer 2, the second feed mixer 3 and the third feed mixer 4 all adopt static mixers, including but not limited to SV type static mixers, SK type static mixers, SX type static mixers, SH type static mixers or SL type static mixers. The raw materials enter the static mixer to cause two or more streams of fluid to be cut, sheared, rotated and remixed, so as to achieve the purpose of good dispersion and sufficient mixing between the fluids. The static mixer is a mature prior art, and its specific structure and working principle are not repeated here. The solvent feed pipe 12 can be used to transport solvents such as straight-chain alkanes, branched alkanes, cycloalkanes, and mixed alkanes; the catalyst promoter pipe can be used to transport alkyl metals such as alkyl aluminum, alkyl aluminoxane, and modified alkyl aluminoxane as catalyst promoters; the agent promoter pipe can be used to transport one or more agents such as chain transfer agents and antifouling agents. The heating device 6 adopts a coil form welded to the circumference of the kettle body. The heating medium enters through the heating liquid inlet pipe 61 at the top of the coil and is discharged through the heating liquid outlet pipe 62 at the bottom. A valve is set on the heating liquid inlet pipe 61 to control the flow of the heating medium and control the temperature. The heating medium includes but is not limited to heating media such as steam and hot oil. The cooling system adopts a jacket form, and the jacket is set around the kettle body. The cooling medium enters through the cooling liquid inlet pipe 71 at the bottom of the jacket and is discharged through the cooling liquid outlet pipe 72 at the top. A valve is set on the cooling liquid inlet pipe 71 to control the flow of the cooling medium and control the temperature. The cooling medium includes but is not limited to cooling media such as circulating water, chilled water or cold oil. According to actual application conditions, the heating device 6 and the cooling device 7 may also be of other types, as long as they can meet the heating and cooling requirements of the reactor 1 .

[0046] Optionally, the ethylene dimerization production 1-butene reaction system further includes an air inlet pipe 20 and an exhaust pipe 21. The air inlet pipe 20 runs through the reactor 1 and is connected to the accommodating chamber, and an air inlet valve 22 is installed on the air inlet pipe 20; the exhaust pipe 21 runs through the reactor 1 and is connected to the accommodating chamber, and an exhaust valve 23 is installed on the exhaust pipe 21.

[0047] When the reaction is carried out in the reactor 1, it is necessary to avoid contact with oxygen as much as possible. In the above setting, before the reaction is carried out, the air inlet valve 22 and the exhaust valve 23 are opened, and an inert gas, such as nitrogen, is injected into the reactor 1 through the air inlet pipe 20. The injected nitrogen replaces the original air in the reactor 1, and the original air is discharged through the exhaust pipe 21. According to experience, after a certain period of nitrogen injection, the original air in the reactor 1 is completely replaced. At this time, the air inlet valve 22 and the exhaust valve 23 are closed, and each feed valve 19 is opened to carry out the reaction process. Figure 1 As shown, in this embodiment, the air inlet pipe 20 and the exhaust pipe 21 are both opened at the top of the reactor 1.

[0048] Optionally, the ethylene dimerization production 1-butene reaction system further includes an oxygen concentration meter (not shown) and a controller (not shown). The oxygen concentration meter is installed on the exhaust pipe 21; the input end of the controller is communicatively connected to the output end of the oxygen concentration meter, and the output end of the controller is communicatively connected to the control ends of the intake valve 22 and the exhaust valve 23. With this arrangement, the controller can determine the timing of completion of the inert gas replacement according to the oxygen content in the gas discharged from the exhaust pipe 21, and then control the intake valve 22 and the exhaust valve 23 to automatically close.

[0049] During the gas replacement process, the inert gas is continuously injected through the air inlet pipe 20, and the gas in the reactor 1 is continuously discharged through the exhaust pipe 21. The oxygen concentration meter monitors the oxygen concentration data in the gas discharged through the exhaust pipe 21 in real time, and transmits the oxygen concentration data to the controller. The controller pre-stores the set oxygen concentration indicating that the gas replacement is completed, and compares the detected oxygen concentration data with the set oxygen concentration. When the oxygen concentration data is less than or equal to the set oxygen concentration, it means that the inert gas replacement is completed. At this time, the controller controls the air inlet valve 22 and the exhaust valve 23 to be closed. Then, the staff can open the feed valve 19 and the heating device 6 on each feed pipe to start the mixing and reaction process. The controller controls the control logic of the opening and closing of the air inlet valve 22 and the exhaust valve 23 according to the change of the oxygen concentration data, which can be realized according to the existing mature algorithm, and its specific working principle is not repeated here. In addition, the control end of the feed valve 19 on each feed pipe can also be connected to the output end of the controller in communication, so that when the oxygen concentration data meets the requirements, the controller controls the air inlet valve 22 and the exhaust valve 23 to be closed while controlling each feed valve 19 to be opened.

[0050] Optionally, the ethylene dimerization production 1-butene reaction system further includes a pressure relief pipe 24, which runs through the reactor 1 and is connected to the accommodating chamber, and a pressure relief valve 25 is installed on the pressure relief pipe 24. As the reaction in the reactor 1 continues, the temperature and pressure in the reactor 1 rise accordingly. When the pressure rises to a certain level, in order to avoid potential dangers caused by excessive pressure, a certain amount of pressure needs to be released. According to experience, when the reaction is carried out for a certain period of time, the pressure relief valve 25 can be opened to release the pressure, and after being opened for a certain period of time, the pressure relief valve 25 can be closed without affecting the continuous and stable progress of the reaction.

[0051] Optionally, the ethylene dimerization production 1-butene reaction system further includes an on-site pressure gauge 26 and a remote pressure gauge 27. The on-site pressure gauge 26 monitors and displays the pressure in the reactor 1; the remote pressure gauge 27 monitors the pressure in the reactor 1; the input end of the controller is communicatively connected to the output end of the remote pressure gauge 27, and the output end of the controller is communicatively connected to the control end of the pressure relief valve 25. With this arrangement, the controller can obtain the pressure data in the reactor 1 in real time through the remote pressure gauge 27, and control the opening of the pressure relief valve 25 when the pressure data exceeds the standard. At the same time, the on-site staff can also visually observe the pressure in the reactor 1 through the on-site pressure gauge 26, grasp the pressure dynamics in the reactor 1, and when the pressure exceeds the standard but the controller fails to control the opening of the pressure relief valve 25 in time, it can be manually opened to ensure the safety of the reaction in the reactor 1.

[0052] like Figure 1 As shown, the on-site pressure gauge 26 and the remote pressure gauge 27 are both installed at the top of the reactor 1. The on-site pressure gauge 26 monitors the pressure data in the reactor 1 in real time and can be displayed in the form of scale or numbers. The remote pressure gauge 27 also monitors the pressure data in the reactor 1 in real time, and transmits the pressure data to the controller in real time. The controller pre-stores a set high pressure value, and compares the monitored pressure data with the set high pressure value. When the pressure data is greater than or equal to the set high pressure value, the controller controls the pressure relief valve 25 to open. The controller also pre-stores a set low pressure value. When the monitored pressure data is less than the set low pressure value, the controller controls the pressure relief valve 25 to close. The controller controls the control logic of the opening and closing of the pressure relief valve 25 according to the change of pressure data, which can be realized according to the existing mature algorithm, and its specific working principle will not be repeated here.

[0053] Optionally, the inner diameter of the outlet side of the mixing feed main pipe 5 is smaller than the inner diameter of the inlet side; the angle between the mixing feed main pipe 5 and the horizontal plane is 0-60°. The inner diameter of the inlet side of the mixing feed main pipe 5 is larger to introduce the front mixed material, and the inner diameter of the outlet side is smaller, which is conducive to increasing the impact force of the mixed material when entering the reactor 1 and avoiding the polymer from blocking the feed port of the reactor 1. At the same time, the mixing feed main pipe 5 is tilted in the above-mentioned angle range to ensure that the materials are rotated and mixed in the reactor 1.

[0054] The angle between the mixing feed main pipe 5 and the horizontal plane can be set to 1°, 5°, 10°, 15°, 20°, 25°, 30°, 35°, 40°, 45°, 50°, 55° or 60°, etc., but is not limited to the listed values. Other unlisted values ​​within the numerical range are also applicable, and preferably 10-30°.

[0055] Optionally, the ethylene dimerization reaction system for producing 1-butene further includes a safety pipe 28, which runs through the reactor 1 and communicates with the accommodating chamber, and a safety valve 29 and a bursting disc 30 are installed in the safety pipe 28. The safety valve 29 and the bursting disc 30 constitute a pressure protection device. When the pressure in the reactor 1 is too high, the high-pressure gas and liquid break through the bursting disc 30 and the safety valve 29 to release the pressure, thereby avoiding safety accidents such as explosion of the reactor 1.

[0056] like Figure 1 As shown, the bursting disc 30 is close to the reactor 1, and the safety valve 29 is far away from the reactor 1. When the pressure in the reactor 1 is too high, it is first discharged at the bursting disc 30 and then discharged through the safety valve 29 to prevent the mixed material from directly contacting the safety valve 29 and causing the inlet pipeline of the safety valve 29 to be blocked. The bursting disc 30 and the safety valve 29 are mature existing technologies, and their specific structures are not repeated here.

[0057] Optionally, the ethylene dimerization production 1-butene reaction system also includes a liquid phase thermometer 31, which monitors the liquid temperature in the reactor 1; the input end of the controller is communicatively connected to the output end of the liquid phase thermometer 31, and the output end of the controller is communicatively connected to the control ends of the heating device 6 and the cooling device 7.

[0058] The liquid phase thermometer 31 monitors the temperature data of the liquid phase mixed material in the reactor 1 in real time, and transmits the temperature data to the controller. The controller has a pre-stored high value of set temperature and a low value of set temperature. After receiving the temperature data, the controller compares it with the high value of set temperature and the low value of set temperature. If the monitored temperature data is greater than or equal to the high value of set temperature, it indicates that the temperature in the reactor 1 is too high. At this time, the controller controls to shut down the heating device 6 and turn on the cooling device 7; if the monitored temperature data is less than or equal to the low value of set temperature, it indicates that the temperature in the reactor 1 is too low. At this time, the controller controls to shut down the cooling device 7 and turn on the heating device 6; if the monitored temperature data is greater than the low value of set temperature and less than the high value of set temperature, it indicates that the temperature in the reactor 1 is appropriate and maintains the current state. The controller adjusts the control logic of starting and stopping the heating device 6 and the cooling device 7 according to the temperature data, which can be realized according to the existing mature algorithm, and its specific working principle is not repeated here. In addition, a gas phase thermometer 32 can also be set to monitor the gas phase temperature in the reactor 1, and the gas phase temperature can assist in understanding the temperature situation in the reactor 1.

[0059] Figure 3 for Figure 1 The top view of the ethylene dimerization production of 1-butene reaction system connected to the ethylene feed side line is shown. Figure 3 As shown, optionally, the ethylene dimerization reaction system for producing 1-butene further comprises a plurality of ethylene feed side lines 33, each of which runs through the reactor 1 and is arranged tangentially to the inner wall of the reactor 1, and each of which is equipped with a regulating valve 34 and a flow meter 35; the input end of the controller is in communication connection with the output end of each flow meter 35, and the output end of the controller is in communication connection with the control end of each regulating valve 34. By using the ethylene feed side line 33, when a large amount of ethylene is required to be supplemented, ethylene can be simultaneously injected into the reactor 1 through the ethylene feed pipe 13 and the ethylene feed side line 33, and the ethylene feed side line 33 is arranged tangentially to the inner wall of the reactor 1, and a stirring device is also not required, and the ethylene is fed along the tangent line, and the mixed material entering through the mixed feed main pipe 5 along the tangent direction of the inner wall of the reactor 1 impacts each other, thereby increasing the mixing intensity and improving the heat transfer effect in the reactor 1.

[0060] During the reaction, part of the reaction product in the reactor 1 can be taken out for analysis and detection to obtain the product content of 1-butene, and the feed amount of each material can be adjusted according to the content of 1-butene. When the analysis results show that a large amount of ethylene feed needs to be increased, one or more ethylene feed sub-lines 33 can be selected, and the regulating valve 34 on the corresponding ethylene feed sub-line 33 can be opened to transport ethylene into the reactor 1 simultaneously with the ethylene feed pipe 13. Figure 3 As shown, in this embodiment, three ethylene feed sub-lines 33 are provided, and the four ethylene feed sub-lines 33 and the mixed feed main pipe 5 are equally spaced and distributed around the reactor 1, and each ethylene feed sub-line 33 is equipped with a flow meter 35. The three ethylene feed sub-lines 33 are all connected to the ethylene feed main line 36, and the ethylene feed main line 36 provides an ethylene source for each ethylene feed sub-line 33. When the regulating valve 34 on one or several ethylene feed sub-lines 33 is opened, the corresponding flow meter 35 is opened at the same time, and each flow meter 35 monitors the ethylene flow data flowing through the ethylene feed sub-line 33, and transmits the ethylene flow data to the controller, and the total ethylene flow rate expected to be transported through each ethylene feed sub-line 33 is input into the controller, and the ethylene flow data monitored by each flow meter 35 are added in the controller. When the calculation result is greater than or equal to the total ethylene flow rate, the controller controls each regulating valve 34 to close. The control logic of the controller controlling the opening and closing of the regulating valve 34 according to the ethylene flow data can be realized according to the existing mature algorithms, and its specific working principle will not be repeated here.

[0061] Optionally, a check valve 37 is installed on each of the solvent feed pipe 12, the ethylene feed pipe 13, the auxiliary agent feed pipe 15, the co-catalyst feed pipe 16, the main catalyst feed pipe 18 and the mixed feed main pipe 5. The check valve 37 is provided to prevent the materials transported in each feed pipe from flowing backward, to ensure the continuous transport of each material, and to ensure the stable and continuous reaction.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A reaction system for producing 1-butene by ethylene dimerization, characterized in that: include: A reaction kettle, wherein a containing chamber is provided in the reaction kettle, and a feed port, a discharge port and a discharge port connected to the containing chamber are provided, the discharge port is connected to a discharge pipe, a discharge valve is installed on the discharge pipe, the discharge port is connected to a discharge pipe, and a discharge valve is installed on the discharge pipe; A first feed mixer, wherein a first inlet of the first feed mixer is connected to a solvent feed pipe, and a second inlet of the first feed mixer is connected to an ethylene feed pipe; A second feed mixer, wherein the first inlet of the second feed mixer is connected to the outlet of the first feed mixer through a first connecting pipe, the second inlet of the second feed mixer is connected to the auxiliary agent feed pipe, and the third inlet of the second feed mixer is connected to the co-catalyst feed pipe; A third feed mixer, wherein a first inlet of the third feed mixer is connected to an outlet of the second feed mixer via a second connecting pipe, and a second inlet of the third feed mixer is connected to a main catalyst feed pipe; A mixing feed main pipe, the inlet of which is connected to the outlet of the third feed mixer, the outlet of which is connected to the feed port, and is arranged tangent to the inner wall of the reactor; Feed valves are installed on the solvent feed pipe, the ethylene feed pipe, the additive feed pipe, the co-catalyst feed pipe, the main catalyst feed pipe and the mixed feed main pipe respectively; A heating device, the heating device is arranged around the reactor; A cooling device is arranged around the reactor.

2. The ethylene dimerization production 1-butene reaction system according to claim 1, characterized in that: Also includes: An air intake pipe, the air intake pipe passes through the reactor and is connected to the accommodating chamber, and an air intake valve is installed on the air intake pipe; An exhaust pipe runs through the reactor and is connected to the accommodating chamber. An exhaust valve is installed on the exhaust pipe.

3. The ethylene dimerization production 1-butene reaction system according to claim 2, characterized in that: Also includes: an oxygen concentration meter installed on the exhaust pipe; A controller, wherein an input end of the controller is communicatively connected to an output end of the oxygen concentration meter, and an output end of the controller is communicatively connected to control ends of the intake valve and the exhaust valve.

4. The ethylene dimerization production 1-butene reaction system according to claim 3, characterized in that: Also includes: A pressure relief pipe runs through the reaction kettle and is connected to the accommodating chamber, and a pressure relief valve is installed on the pressure relief pipe.

5. The ethylene dimerization production 1-butene reaction system according to claim 4, characterized in that: Also includes: An on-site pressure gauge, which monitors and displays the pressure in the reactor; A remote pressure gauge, the remote pressure gauge monitoring the pressure in the reactor; The input end of the controller is communicatively connected to the output end of the remote pressure gauge, and the output end of the controller is communicatively connected to the control end of the pressure relief valve.

6. The reaction system for producing 1-butene by ethylene dimerization according to any one of claims 1 to 5, characterized in that: The inner diameter of the outlet side of the mixed feed main pipe is smaller than the inner diameter of the inlet side thereof; The angle between the mixing feed main pipe and the horizontal plane is 0-60°.

7. The reaction system for producing 1-butene by ethylene dimerization according to any one of claims 1 to 5, characterized in that: Also includes: A safety tube runs through the reactor and is connected to the accommodating chamber. A safety valve and a bursting disc are installed in the safety tube.

8. The reaction system for producing 1-butene by ethylene dimerization according to any one of claims 3 to 5, characterized in that: Also includes: A liquid phase thermometer, which monitors the temperature of the liquid in the reactor; The input end of the controller is communicatively connected to the output end of the liquid phase thermometer, and the output end of the controller is communicatively connected to the control ends of the heating device and the cooling device.

9. The reaction system for producing 1-butene by ethylene dimerization according to any one of claims 3 to 5, characterized in that: Also includes: A plurality of ethylene feed side lines, each of which runs through the reactor and is arranged tangentially to the inner wall of the reactor, and each of which is equipped with a regulating valve and a flow meter; The input end of the controller is communicatively connected to the output end of each of the flow meters, and the output end of the controller is communicatively connected to the control end of each of the regulating valves.

10. The reaction system for producing 1-butene by ethylene dimerization according to any one of claims 1 to 5, characterized in that: The solvent feed pipe, the ethylene feed pipe, the auxiliary agent feed pipe, the co-catalyst feed pipe, the main catalyst feed pipe and the mixed feed main pipe are respectively equipped with check valves.

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