Olefin mixing apparatus and method

Abstract

The application discloses an olefin mixed gas distribution device and method, which comprises a gas distribution tank, a flow guide ring, a distribution plate, a static mixer, an olefin feed inlet and a circulating power unit. The top of the gas distribution tank is provided with a raw material inlet, a mixed gas outlet and a circulating outlet, and the bottom is provided with a circulating inlet; the flow guide ring is arranged in the gas distribution tank and is connected with the circulating inlet at the bottom of the gas distribution tank; the distribution plate is arranged in the gas distribution tank and is located above the flow guide ring; the static mixer is connected with the circulating outlet at the top of the gas distribution tank and the circulating inlet at the bottom of the gas distribution tank; the olefin feed inlet is arranged between the static mixer and the circulating outlet; and the circulating power unit is arranged between the static mixer and the circulating inlet. The olefin mixed gas distribution device can be used for the sufficient mixing of different olefin comonomers, so that the composition of the mixed gas is more uniform, and the component uniformity of the copolymer is improved.

Description

Technical Field

[0001] This invention relates to an olefin mixing and gas distribution device and method, and particularly to an olefin mixing and gas distribution device and a method for mixing olefins using the device. It belongs to the field of chemical synthesis resin catalysts and new product technologies, specifically polyethylene catalysts, processes, and new product technologies. Background Technology

[0002] With the rapid growth in demand for high-quality polyethylene products, competition in the polyethylene market is becoming increasingly fierce, and the specialization and high-end development of catalysts have become a trend. Slurry polymerization, with its lower reaction pressure, easier control of operating conditions, and better product performance, is one of the important HDPE production technologies in my country. In recent years, domestic polyolefin production facilities have been continuously expanding, and new product development has become crucial for the development of production enterprises. Research on olefin polymerization reactions, especially olefin copolymerization reactions, has become the core of technological breakthroughs. The olefin polymerization process involves the polymerization reaction of olefin monomers on solid catalyst particles. The resulting polymer replicates the particle morphology of the catalyst; apart from varying degrees of particle size enlargement, its particle shape, particle size distribution, and bulk density are all directly related to the particle morphology of the catalyst.

[0003] Chinese patent CN201811144109.7 discloses a gas mixing device for gas distribution, which includes a tank, a bottom plate, four sets of support legs, and a stirring motor; it includes four sets of left support rods, four sets of right support rods, a cooling box, a heating box, an upper left partition, a lower left partition, an upper right partition, a lower right partition, multiple sets of left heat exchange tubes, multiple sets of right heat exchange tubes, a heating coil, and a cooling coil; it also includes a fixing ring, a first left support rod, a second left support rod, a first right support rod, a second right support rod, a semi-cylinder, a semi-screw, an adjusting threaded sleeve, an upper limit clamping plate, a lower limit clamping plate, and a locking plate. The fixing ring is fixedly fitted on the upper side of the outer wall of the tank, and the adjusting threaded sleeve has anti-slip teeth arranged alternately on the outside; the gas mixing device involved in this invention is mainly used for gas mixing, and does not involve the mixing of α-olefins, especially the mixing of different liquid α-olefins.

[0004] Chinese patent CN201911425957.X discloses a special stirring device for mixing viscous fluids and dispersing gases. It includes an upper drive mechanism (1), a stirring vessel containing the medium, a shaft (2) extending into the vessel from the drive mechanism, and a stirrer (3) installed and positioned at the lower end of the shaft (2). A gas distributor (4) is arranged below the stirrer (3). Through the special design of the stirrer (3) and the gas distributor (4) below it, the gas-liquid mass transfer capacity can be improved, and the mixing efficiency of the fluid can be enhanced. It solves the problem of mixing and dispersing gases in high-viscosity media. It is suitable for the ventilation stirring fermentation process of viscous materials, and is also suitable for other gas-liquid reaction processes such as hydrogenation and oxidation reactions, so that it has high-efficiency mixing performance and gas dispersion mass transfer performance. This invention designs a gas distributor for the problem of mixing and dispersing gases in high-viscosity media, but does not involve the mixing and gas distribution of α-olefins.

[0005] Chinese patent CN202022158024.3 discloses a standard mixed gas preparation device, which includes a preparation chamber. A forward and reverse reversing motor is fixedly installed at the top center of the preparation chamber. A rotating shaft is driven to the end of the output shaft of the forward and reverse reversing motor. A drive gear is fixedly installed at the top of the rotating shaft, and three sets of stirring blades are fixedly installed at the bottom of the rotating shaft. Rotating rods are provided on both sides of the inner cavity of the preparation chamber. This invention uses the forward and reverse reversing motor to drive the stirring blades and the two rotating rods to rotate, thereby driving the corresponding movable plate to move slowly upward, forcing the gas on both sides of the inner cavity of the preparation chamber into the mixing chamber. The stirring blades stir and mix the incoming gas. When the forward and reverse reversing motor rotates in reverse, the gas in the middle of the inner cavity of the preparation chamber is drawn back into the mixing chamber for stirring and mixing. By adjusting the forward and reverse reversing motor, the gas in the inner cavity of the preparation chamber is continuously mixed through the mixing chamber and the stirring blades, resulting in a fast mixing rate and good mixing effect. This invention is mainly used in the field of standard mixed gas preparation technology and does not involve the mixing and blending of α-olefins, especially the mixing of different liquid α-olefins.

[0006] In the polymerization process, the uniform distribution of different olefins in the polymerization system has become a technical challenge. Existing slurry polymerization evaluation devices for olefin polymerization evaluate the copolymerization of ethylene and α-olefins. In these devices, ethylene monomer is added from the top of the polymerization reactor, and ethylene gas dissolves into the dispersant under specific temperature and pressure conditions. Comonomers are added separately to the dispersant, especially when they are liquid at room temperature; this is usually done in one go or in batches. Therefore, the mixing effect between ethylene and α-olefins is poor, and the comonomers are unevenly distributed in the existing evaluation system. This polymerization process differs from that of industrial slurry polymerization plants, where ethylene and comonomers are pre-mixed and added from the bottom of the reactor. Therefore, existing slurry polymerization evaluation devices are inaccurate in evaluating catalyst activity, and the polymer composition differs from that of products from industrial production plants. They cannot truly reflect the catalyst's performance and cannot provide effective data support for the study of slurry pilot-scale polymerization processes of catalysts. Summary of the Invention

[0007] To address the problems existing in the prior art, the present invention provides an olefin mixing and gas distribution device and method. Different α-olefin comonomers are fully mixed by the olefin mixing and gas distribution device of the present invention, making the composition of the mixed gas more uniform and improving the component uniformity of the copolymer.

[0008] To achieve the above objectives, the present invention provides an olefin mixing and distribution device, which includes: a gas distribution tank, a guide ring, a distribution plate, a static mixer, an olefin feed inlet, and a circulation power unit. The gas distribution tank has a raw material inlet, a mixed gas outlet, and a circulation outlet at the top, and a circulation inlet at the bottom; the guide ring is located inside the gas distribution tank and connected to the circulation inlet at the bottom of the gas distribution tank; the distribution plate is located inside the gas distribution tank and above the guide ring; the static mixer is connected to the circulation outlet at the top of the gas distribution tank and the circulation inlet at the bottom of the gas distribution tank; the olefin feed inlet is located between the static mixer and the circulation outlet; and the circulation power unit is located between the static mixer and the circulation inlet.

[0009] In one embodiment, a chromatograph is also included, disposed at the top of the gas mixing tank.

[0010] In one embodiment, a heating device is also included, disposed inside the gas distribution tank; the heating device includes at least one of a water bath heating device, a steam heating device, an oil bath heating device, an electric heating device, and a light wave heating device.

[0011] In one embodiment, a heating device is further included, disposed on the outer wall of the gas distribution tank; the heating device includes at least one of an electric heating belt and an electric heating jacket.

[0012] In one embodiment, the system further includes a temperature detection port, a pressure detection port, and a discharge port. The temperature detection port and the pressure detection port are located at the top of the gas distribution tank, and the discharge port is located at the bottom of the gas distribution tank.

[0013] In one embodiment, the circulating power unit is a pump or a compressor.

[0014] In one embodiment, the raw material inlet is a first raw material or a nitrogen inlet, used for adding the first raw material or for nitrogen purging.

[0015] In one embodiment, the olefin feed inlet is a second feed inlet.

[0016] In one embodiment, the first raw material and the second raw material are α-olefins, including at least one selected from ethylene, propylene, 1-butene, 4-methyl-1-pentene, 1-hexene and 1-octene.

[0017] The present invention also provides a method for mixing and preparing olefins, which uses the above-mentioned olefin mixing and preparing apparatus and includes the following steps:

[0018] Step S1: Input the first raw material into the olefin mixing and gas distribution device through the raw material inlet at the top of the gas distribution tank;

[0019] Step S2: The second raw material is fed into the static mixer through the olefin feed port; the first raw material in the olefin mixing and gas distribution device is output from the circulation outlet and enters the static mixer. The first raw material and the second raw material are mixed for the first time in the static mixer to obtain the first mixture.

[0020] Step S3: The first mixture is fed into the olefin mixing and gas distribution device through the circulation inlet of the circulating power unit. The first mixture is dispersed by the guide ring and mixed a second time by the distribution plate to obtain the second mixture.

[0021] Step S4: The second mixture is tested by chromatographic analysis to determine the mixing result; if the mixing result is qualified, the second mixture is output from the mixed gas outlet and enters the downstream process; if the mixing result is unqualified, return to step S2, the second mixture is output from the circulation outlet and input into the static mixer for remixing.

[0022] The olefin mixing and gas distribution device of the present invention can be used for the thorough mixing of different olefin comonomers, resulting in a more uniform composition of the mixed gas, which is beneficial to improving the component uniformity of the copolymer. Furthermore, the mixed gas obtained by the present invention can be dispersed from the gas outlet on the agitator at the bottom of the reactor into the slurry system, thereby increasing the concentration of polymerizable monomers in the slurry system, increasing the contact amount between polymerizable monomers and catalysts, and more closely resembling the polymerization environment of slurry-based industrial production equipment. This improves the accuracy of the slurry-based ethylene polymerization evaluation test device in evaluating catalyst activity, provides basic data for slurry-based pilot-scale polymerization equipment, significantly improves the efficiency of pilot-scale polymerization equipment, reduces costs, and has important guiding significance for the operation of slurry-based pilot-scale equipment, polymerization process development, and production equipment technical services. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of an embodiment of the olefin mixing and gas distribution device of the present invention.

[0024] In the attached figures, the following labels are used:

[0025] Gas distribution tank 1

[0026] Cyclic Power Unit 2

[0027] Chromatography 3

[0028] Distribution plate 4

[0029] Flow guide ring 5

[0030] Raw material inlet 6

[0031] Mixed gas outlet 7

[0032] Circulation outlet 8

[0033] Temperature detection port 9

[0034] Pressure detection port 10

[0035] The bottom has a circulation inlet 11

[0036] Discharge port 12

[0037] Heating device 13

[0038] Static Mixer 14

[0039] Olefin inlet 15 Detailed Implementation

[0040] The olefin mixing and gas distribution apparatus and method of the present invention will be further described below with reference to the accompanying drawings.

[0041] Please refer to Figure 1 , Figure 1This is a schematic diagram of an embodiment of the olefin mixing and gas distribution device of the present invention. The olefin mixing and gas distribution device of the present invention includes a gas distribution tank 1, a guide ring 5, a distribution plate 4, a static mixer 14, an olefin feed inlet 15, and a circulating power unit 2.

[0042] Gas mixing tank 1 is used to mix and distribute raw materials, which include at least two α-olefins, such as, but not limited to, a mixture of at least two of ethylene, propylene, 1-butene, 4-methyl-1-pentene, 1-hexene, and 1-octene. The top of gas mixing tank 1 is equipped with a chromatograph 3, a raw material inlet 6, a mixed gas outlet 7, a circulation outlet 8, a temperature detection port 9, and a pressure detection port 10. The bottom of gas mixing tank 1 is equipped with a circulation inlet 11 and a discharge port 12.

[0043] Raw material inlet 6 is either the first raw material or a nitrogen inlet, used for adding the first raw material or for nitrogen purging. The first raw material can be a single substance or a mixture. For example, the first raw material can be at least one of ethylene, propylene, 1-butene, 4-methyl-1-pentene, 1-hexene, and 1-octene, or it can be a mixture of at least two of ethylene, propylene, 1-butene, 4-methyl-1-pentene, 1-hexene, and 1-octene.

[0044] Mixed gas outlet 7 is the outlet for the prepared mixed gas, used to transport the mixed gas to the downstream olefin copolymerization unit or for sampling.

[0045] The circulation outlet 8 is used to output the recycled olefins to the circulation pipeline. Preferably, the circulation pipeline is provided with insulation material on the outside.

[0046] Temperature detection port 9 is used to detect the temperature of gas mixing tank 1, so as to facilitate the complete conversion of liquid olefins into gaseous state.

[0047] The pressure detection port 10 is used to detect the pressure of the gas distribution tank 1, which facilitates the control of the complete conversion of liquid olefins into gaseous state, while also meeting the pressure range of the downstream olefin copolymerization unit.

[0048] Chromatography 3 is used to measure the gas components and their content in gas mixing tank 1 online, ensuring that the obtained mixed gas meets the test requirements.

[0049] Preferably, the gas distribution tank 1 is further provided with a heating device 13, which can be disposed inside or on the outer wall of the gas distribution tank 1. When the heating device 13 is disposed inside the gas distribution tank 1, the heating device 13 includes at least one of a water bath heating device, a steam heating device, an oil bath heating device, an electric heating device, and a light wave heating device. When the heating device 13 is disposed on the outer wall of the gas distribution tank 1, the heating device 13 includes at least one of an electric heating belt and an electric heating jacket.

[0050] The olefin inlet 15 is located between the static mixer 14 and the circulation outlet 8. The olefin inlet 15 is a second raw material inlet, which is used to add the second raw material to be mixed. The second raw material is preferably an olefin, including at least one of ethylene, propylene, 1-butene, 4-methyl-1-pentene, 1-hexene and 1-octene, and most preferably a liquid olefin.

[0051] The static mixer 14 is located between the olefin inlet 15 and the circulating power unit 2, and is used to mix the first raw material from the gas distribution tank 1 and the second raw material added by the olefin inlet 15 for the first time to obtain the first mixture.

[0052] The circulating power unit 2 is located between the static mixer 14 and the circulating inlet 11 to provide circulating power for the circulating mixed olefins. The circulating power unit 2 is, for example, but not limited to, a pump or compressor.

[0053] The circulation inlet 11 is used to input the first mixture into the gas distribution tank 1.

[0054] The discharge port 12 is used to remove residual materials or purge the gas distribution tank 1.

[0055] The guide ring 5 is located inside the gas distribution tank 1 and is connected to the circulation inlet 11 at the bottom of the gas distribution tank 1; the guide ring 5 is used to disperse the first mixture delivered by the circulating power unit 2, which can improve the mixing effect.

[0056] The distribution plate 4 is located inside the gas distribution tank 1 and above the guide ring 5. The distribution plate 4 is used to mix the first mixture dispersed by the flow ring 5. The structure of the distribution plate 4 is preferably such that the mixture is distributed in a more disordered manner to improve the mixing effect. The first mixture is dispersed by the guide ring 5 and then mixed a second time by the distribution plate 4 to obtain the second mixture.

[0057] In use, the olefin mixing and gas distribution device of the present invention first sets the temperature and pressure according to the physical properties of the raw materials. The first raw material is input into the olefin mixing and gas distribution device through the raw material inlet 6 at the top of the gas distribution tank 1. The heating device 13 heats the raw material to the set temperature. The second raw material is input into the static mixer 14 through the olefin inlet 15. The first raw material in the olefin mixing and gas distribution device is output from the circulation outlet 8 and enters the static mixer 14. The first raw material and the second raw material are mixed for the first time in the static mixer 14 to obtain a first mixture. The first mixture is input into the olefin mixing and gas distribution device through the circulation inlet 11 via the circulation power unit 2. The first mixture is dispersed by the guide ring 5 and mixed for the second time by the distribution plate 4 to obtain a second mixture. The second mixture is analyzed by chromatography 3 to test the mixing result. If the mixing result is qualified, the second mixture is output from the mixed gas outlet 7 and enters the downstream olefin polymerization device for copolymerization reaction. If the mixing result is unqualified, the second mixture is output from the circulation outlet 8 and input into the static mixer 14 for re-mixing. The circulation power unit 2 provides power for the circulation of materials.

[0058] The olefin mixing and gas distribution method provided by the present invention uses the above-mentioned olefin mixing and gas distribution device, and the method includes the following steps:

[0059] Step S1: Input the first raw material into the olefin mixing and gas distribution device through the raw material inlet at the top of the gas distribution tank;

[0060] Step S2: The second raw material is fed into the static mixer through the olefin feed port; the first raw material in the olefin mixing and gas distribution device is output from the circulation outlet and enters the static mixer. The first raw material and the second raw material are mixed for the first time in the static mixer to obtain the first mixture.

[0061] Step S3: The first mixture is fed into the olefin mixing and gas distribution device through the circulation inlet of the circulating power unit. The first mixture is dispersed by the guide ring and mixed a second time by the distribution plate to obtain the second mixture.

[0062] Step S4: The second mixture is tested by chromatographic analysis to determine the mixing result; if the mixing result is qualified, the second mixture is output from the mixed gas outlet and enters the downstream process; if the mixing result is unqualified, return to step S2, the second mixture is output from the circulation outlet and input into the static mixer for remixing.

[0063] The following provides a detailed description of the embodiments of the present invention: These embodiments are implemented based on the technical solution of the present invention, and provide detailed implementation methods and processes. However, the scope of protection of the present invention is not limited to the following embodiments. Experimental methods in the following embodiments that do not specify specific conditions are generally performed under conventional conditions.

[0064] Source of raw materials or equipment:

[0065]

[0066] Evaluation and analysis methods:

[0067] Polymerization activity was calculated using the following method:

[0068]

[0069] The unit of polymerization activity is g PE / (g Cat·h).

[0070] Example 1:

[0071] Ethylene and propylene are added to the gas mixing tank through the raw material inlet. A mixed gas is prepared at 30°C according to the molar ratio of ethylene to propylene of 49 / 1. The prepared mixed gas is then ready for use.

[0072] The specific steps for evaluating the ZN catalyst using a prepared gas mixture are as follows:

[0073] Nitrogen gas was introduced into the 2L polymerization reactor through the gas inlet until the gauge pressure reached 0.3 MPa. The reactor was then evacuated through the vent and vacuum ports, repeating this process eight times. Nitrogen gas was then introduced until the gauge pressure reached 0 MPa. The vent was opened, and 0.8 L of hexane (dispersant) was added into the reactor through the catalyst inlet. The vent was closed, and the stirring speed was adjusted to 200 rpm. The reactor temperature was raised to 85°C using the temperature control system. The stirring speed was reduced to 50 rpm, and 0.2 L of hexane (dispersant) was used to add the co-catalyst triethylaluminum and 10 mg of... Zn catalyst was introduced into the polymerization reactor, and triethylaluminum was added at an Al / Ti (molar) ratio of 100. The stirring speed was adjusted to 200 r / min. Based on the pressure inside the polymerization reactor, 0.2 MPa of hydrogen gas was added through the gas inlet, followed by a 1.0 MPa mixture of ethylene and propylene gas to the reaction pressure, and the polymerization reaction began. After reacting for 3 hours under the reaction pressure, the addition of ethylene was stopped. The polymerization reactor was cooled to 20°C using the temperature control system, the vent was opened to release the gas inside the reactor, nitrogen gas was added to purge five times, the discharge port was opened to release the reaction product, and the polymer product was obtained after separating the dispersant n-hexane. The experimental results are shown in Table 1.

[0074] Example 2:

[0075] The ZN catalyst was evaluated using the same method as in Example 1, except that the mixed gas was prepared at 30°C with an ethylene to propylene molar ratio of 48 / 2. The specific experimental conditions and results are shown in Table 1.

[0076] Example 3:

[0077] The ZN catalyst was evaluated using the same method as in Example 1, except that the mixed gas was prepared at 60°C with a molar ratio of ethylene to 1-butene of 49 / 1. The specific experimental conditions and results are shown in Table 1.

[0078] Example 4:

[0079] The ZN catalyst was evaluated using the same method as in Example 1, except that the mixed gas was prepared at 60°C with a molar ratio of ethylene to 1-butene of 48 / 2. The specific experimental conditions and results are shown in Table 1.

[0080] Example 5:

[0081] The ZN catalyst was evaluated using the same method as in Example 1, except that the mixed gas was prepared at 85°C with a molar ratio of ethylene to 1-hexene of 49 / 1. The specific experimental conditions and results are shown in Table 1.

[0082] Example 6:

[0083] The ZN catalyst was evaluated using the same method as in Example 1, except that the mixed gas was prepared at 85°C with a molar ratio of ethylene to 1-hexene of 48 / 2. The specific experimental conditions and results are shown in Table 1.

[0084] Comparative Example 1:

[0085] The ZN catalyst was evaluated using the same method as in Example 1, except that the existing mixing and distribution device structure was different. The mixing and distribution device in this comparative example was a gas distribution tank with a heating unit. It did not have a flow guide ring, distribution plate, static mixer, or circulating power unit inside. The specific experimental conditions and results are shown in Table 1.

[0086] Comparative Example 2:

[0087] The ZN catalyst was evaluated using the same method as in Comparative Example 1, except that the mixed gas was prepared at 30°C with an ethylene to propylene molar ratio of 48 / 2. The specific experimental conditions and results are shown in Table 1.

[0088] Comparative Example 3:

[0089] The ZN catalyst was evaluated using the same method as in Comparative Example 1, except that the mixed gas was prepared at 60°C with a molar ratio of ethylene to 1-butene of 49 / 1. The specific experimental conditions and results are shown in Table 1.

[0090] Comparative Example 3:

[0091] The ZN catalyst was evaluated using the same method as in Comparative Example 1, except that the mixed gas was prepared at 60°C with a molar ratio of ethylene to 1-butene of 48 / 2. The specific experimental conditions and results are shown in Table 1.

[0092] Comparative Example 5:

[0093] The ZN catalyst was evaluated using the same method as in Comparative Example 1, except that the mixed gas was prepared at 85°C with a molar ratio of ethylene to 1-hexene of 49 / 1. The specific experimental conditions and results are shown in Table 1.

[0094] Comparative Example 6:

[0095] The ZN catalyst was evaluated using the same method as in Comparative Example 1, except that the mixed gas was prepared at 85°C with a molar ratio of ethylene to 1-hexene of 48 / 2. The specific experimental conditions and results are shown in Table 1.

[0096] Table 1. Experimental conditions and results of the examples and comparative examples.

[0097]

[0098] As can be seen from the data in Table 1, compared with the existing gas mixing and distribution device, under the same gas distribution temperature and gas distribution ratio, the olefin gas mixing and distribution device of the present invention produces a more uniform mixture. The olefin gas mixing and distribution device of the present invention realizes the premixing of olefin comonomers, which can more accurately evaluate the activity of polyolefin catalysts when used for subsequent evaluation of polyolefin catalysts, and greatly improve the efficiency of pilot-scale polymerization and the safety of equipment operation.

[0099] The above description is only a preferred embodiment of the present invention. It should be noted that those skilled in the art can make several improvements without departing from the present invention, and these improvements should also be considered within the scope of protection of the present invention.

Claims

1. An olefin mixing and gas distribution device, characterized in that, include: The gas mixing tank has a raw material inlet, a mixed gas outlet, a circulation outlet, and a chromatograph at the top, and a circulation inlet at the bottom. The first raw material is input into the olefin mixing gas mixing device through the raw material inlet at the top of the gas mixing tank. A flow guide ring is disposed inside the gas distribution tank and connected to the circulation inlet at the bottom of the gas distribution tank; A distribution plate is disposed inside the gas distribution tank and located above the flow guide ring; A static mixer is connected to the circulation outlet at the top of the gas distribution tank and the circulation inlet at the bottom of the gas distribution tank; An olefin inlet is located between the static mixer and the circulation outlet, through which the second raw material is fed into the static mixer. The first raw material is output from the circulation outlet and enters the static mixer, where the first raw material and the second raw material are mixed for the first time to obtain a first mixture. A circulating power unit is located between the static mixer and the circulating inlet; as well as A heating device is located inside or on the outer wall of the gas distribution tank; The first mixture is fed into the olefin mixing and distribution device through the circulation inlet via the circulation power unit. The first mixture is dispersed by the guide ring and then mixed a second time by the distribution plate to obtain the second mixture. The second mixture is tested by chromatographic analysis to determine the mixing result. If the mixing result is qualified, the second mixture is output from the mixed gas outlet and enters the downstream process. If the mixing result is unqualified, the second mixture is output from the circulation outlet and input into the static mixer for re-mixing.

2. The olefin mixing and gas distribution device according to claim 1, characterized in that, When the heating device is located inside the gas distribution tank, the heating device includes at least one of a water bath heating device, a steam heating device, an oil bath heating device, an electric heating device, and a light wave heating device.

3. The olefin mixing and gas distribution device according to claim 1, characterized in that, When the heating device is located on the outer wall of the gas distribution tank, the heating device includes at least one of an electric heating belt and an electric heating sleeve.

4. The olefin mixing and gas distribution device according to claim 1, characterized in that, It also includes a temperature detection port, a pressure detection port, and a discharge port. The temperature detection port and the pressure detection port are located at the top of the gas distribution tank, and the discharge port is located at the bottom of the gas distribution tank.

5. The olefin mixing and gas distribution device according to claim 1, characterized in that, The circulating power unit is a pump or a compressor.

6. The olefin mixing and gas distribution device according to claim 1, characterized in that, The raw material inlet is either the first raw material inlet or the nitrogen inlet, used for adding the first raw material or for nitrogen purging.

7. The olefin mixing and gas distribution device according to claim 1, characterized in that, The olefin inlet is the second raw material inlet.

8. The olefin mixing and gas distribution device according to claim 6 or 7, characterized in that, The first raw material and the second raw material are α-olefins, including at least one of ethylene, propylene, 1-butene, 4-methyl-1-pentene, 1-hexene and 1-octene.

9. A method for mixing and preparing olefin gases, characterized in that, The method using the olefin mixing and gas distribution apparatus according to any one of claims 1-8 includes the following steps: Step S1: Input the first raw material into the olefin mixing and gas distribution device through the raw material inlet at the top of the gas distribution tank; Step S2: The second raw material is fed into the static mixer through the olefin feed port; the first raw material in the olefin mixing and gas distribution device is output from the circulation outlet and enters the static mixer. The first raw material and the second raw material are mixed for the first time in the static mixer to obtain the first mixture. Step S3: The first mixture is fed into the olefin mixing and gas distribution device through the circulation inlet of the circulating power unit. The first mixture is dispersed by the guide ring and mixed a second time by the distribution plate to obtain the second mixture. Step S4: The second mixture is tested by chromatographic analysis to determine the mixing result; if the mixing result is qualified, the second mixture is output from the mixed gas outlet and enters the downstream process; if the mixing result is unqualified, return to step S2, the second mixture is output from the circulation outlet and input into the static mixer for remixing.

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