CN116407967A - A kind of olefin mixing gas distribution device and method - Google Patents

Abstract

The utility model discloses an olefin mixing and gas distribution device and a method, wherein the olefin mixing and gas distribution device comprises: the device comprises a gas distribution tank, a 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 of the gas distribution tank is provided with a circulating inlet; the guide ring is arranged in the gas distribution tank and is connected with a circulating inlet at the bottom of the gas distribution tank; the distribution plate is arranged in the gas distribution tank and is positioned above the guide ring; the static mixer is connected with a circulating outlet at the top of the gas distribution tank and a circulating inlet at the bottom of the gas distribution tank; the olefin feed inlet is arranged between the static mixer and the circulating outlet; the circulating power unit is arranged between the static mixer and the circulating inlet. The olefin mixing and gas distributing device can be used for fully mixing different olefin comonomers, so that the composition of the obtained mixed gas is more uniform, and the uniformity of components of copolymers is improved.

Description

A kind of olefin mixing gas distribution device and method

technical field

The invention relates to an olefin mixing gas distribution device and method, in particular to an olefin mixing gas distribution device and a method for mixing olefins using the device, belonging to the synthetic resin catalyst in the chemical industry and the polyethylene catalyst, process and new product technology. product technologies.

Background technique

In 2020, China's polyethylene market demand will reach 38 million tons, the domestic production capacity will reach 23 million tons per year, and the import volume will reach 18 million tons. High-end products mainly rely on imports. With the rapid growth of demand for high-quality polyethylene products, the competition in the polyethylene market has become increasingly fierce, and the specialization and high-end of catalysts have become a trend. The slurry polymerization process has low reaction pressure, easy control of operating conditions, and good product performance. It is one of the important production technologies of HDPE in my country. At present, the domestic slurry process HDPE production capacity is 7.5 million tons/year, and the catalyst required is 300 tons/year. In recent years, domestic polyolefin production facilities have continued to expand, new product development has become the key to the development of production enterprises, and research on olefin polymerization, especially olefin copolymerization, has become the core of technological research. The olefin polymerization process is that olefin monomers are polymerized on solid catalyst particles, and the resulting polymer replicates the particle shape of the catalyst. Except that the particle size is enlarged to varying degrees, its particle shape, particle size distribution and bulk density are similar to those of the catalyst particles. form is directly related.

Chinese patent CN201811144109.7 discloses a gas mixing device for gas distribution, which includes a tank body, a bottom plate, four sets of legs and a stirring motor; four sets of left support rods, four sets of right support rods, a cooling box, a heating Box, upper left partition, lower left partition, upper right partition, lower right partition, multiple sets of left heat exchange tubes, multiple sets of right heat exchange tubes, heating coils and cooling coils; also includes fixed ring, left first branch Rod, left second support rod, right first support rod, right second support rod, half cylinder, half screw, adjusting threaded sleeve, upper limit splint, lower limit splint and clamping plate, fixed ring fixed on the outer wall of the tank The upper side of the adjustment threaded sleeve is provided with anti-skid staggered lines; the gas mixing device involved in this invention is mainly used for gas mixing, and does not involve the mixing and distribution of α-olefins, especially the mixing of different liquid α-olefins .

Chinese patent CN201911425957.X discloses a special stirring device for viscous fluid mixing and gas dispersion, which includes an upper driving mechanism (1), a stirring tank containing a medium, a shaft (2) extending into the tank from the driving mechanism, and an installation The stirrer (3) located at the lower end of the shaft (2), and the gas distributor (4) is arranged under the stirrer (3), and the special design of the stirrer (3) cooperates with the gas distributor (4) below it, both It can improve the gas-liquid mass transfer capacity, and can enhance the mixing efficiency of the fluid. It solves the problems of high-viscosity medium mixing and gas dispersion. It is suitable for the ventilation and stirring fermentation process of viscous materials, and it is also suitable for hydrogenation and oxidation reactions. And other gas-liquid reaction processes, so that it has efficient mixing performance and gas dispersion mass transfer performance; the invention designs a gas distributor for the problems of high-viscosity medium mixing and gas dispersion, and does not involve the mixing and distribution of α-olefins.

Chinese patent CN202022158024.3 discloses a standard mixed gas preparation device, which includes a preparation chamber, a forward and reverse motor is fixed at the middle position on the top of the preparation chamber, and a rotating shaft is connected to the end of the output shaft of the forward and reverse motor , the top of the rotating shaft is fixedly provided with a driving gear, and the bottom of the rotating shaft is fixedly provided with three sets of stirring blades, and both sides of the inner cavity of the preparation chamber are provided with rotating rods. The utility model drives the stirring blade and the two rotating rods to rotate through the positive and negative rotation of the motor, and then drives the movable plate at the corresponding position to move upward slowly, and presses the gas on both sides of the inner cavity of the preparation chamber into the mixing chamber, and the stirring blade realizes Stir and mix the incoming gas, when the forward and reverse motor reverses, the gas in the middle of the preparation chamber is sucked into the middle mixing chamber again for stirring and mixing, and the forward and reverse motor is adjusted, so that the preparation can be realized through the mixing chamber and the stirring blade The gas in the cavity is continuously mixed, the mixing rate is faster, and the mixing effect is better; this invention is mainly used in the technical field of preparation of standard mixed gases, and does not involve the mixing and distribution of α-olefins, especially the mixing of different liquid α-olefins .

During the polymerization process, the uniform distribution of different olefins in the polymerization system has become a technical difficulty. When the existing slurry method olefin polymerization evaluation device evaluates the copolymerization of ethylene and α-olefin, ethylene monomer is added at the top of the polymerization reactor, ethylene gas is dissolved into the dispersant under certain temperature and pressure conditions, and the comonomer alone When added to the dispersant, especially comonomers that are liquid at room temperature are usually added at one time or in batches, so the mixing effect of ethylene and α-olefins is poor, and the comonomers in the existing evaluation system Inhomogeneous distribution in the medium, the polymerization process of this evaluation test is different from the process of the slurry method industrial production device. During the polymerization reaction of the slurry method industrial production device, ethylene and comonomer are added from the bottom of the reactor after pre-mixing, so The existing slurry polymerization evaluation test device is inaccurate in evaluating the activity of the catalyst, and there is a certain gap between the composition of the polymer and the product of the industrial production device, which cannot truly reflect the performance of the catalyst, and cannot provide effective data for the research on the slurry pilot polymerization process of the catalyst support.

Contents of the invention

In order to solve the problems existing in the prior art, the present invention provides an olefin mixing gas distribution device and method. Different α-olefin comonomers are fully mixed through the olefin mixing gas distribution device of the present invention, so that the composition of the mixed gas is more uniform, and there is It is beneficial to improve the component uniformity of the copolymer.

To achieve the above purpose, the present invention provides an olefin mixing and gas distribution device, which includes: a gas distribution tank, a deflector ring, a distribution plate, a static mixer, an olefin feed port and a cycle power unit. The top of the gas distribution tank is provided with a raw material inlet, a mixed gas outlet, and a circulation outlet, and the bottom is provided with a circulation inlet; the guide ring is set inside the gas distribution tank and connected to the circulation inlet at the bottom of the gas distribution tank; Inside the tank and above the guide ring; the static mixer is connected to the circulation outlet on the top of the gas distribution tank and the circulation inlet at the bottom of the gas distribution tank; the olefin feed port is set between the static mixer and the circulation outlet; the circulation power unit It is located between the static mixer and the circulation inlet.

In one embodiment, a chromatograph is also included, which is arranged on the top of the gas distribution tank.

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

In one embodiment, a heating device is also included, which is arranged 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.

In one embodiment, it also includes a temperature detection port, a pressure detection port and a material discharge port, the temperature detection port and the pressure detection port are located on the top of the gas distribution tank, and the material discharge port is located on the bottom of the gas distribution tank.

In one embodiment, the cycle power unit is a pump or a compressor.

In one embodiment, the raw material inlet is the first raw material or the nitrogen gas inlet, which is used for adding the first raw material or nitrogen purging.

In one embodiment, the olefin feed inlet is the second raw material inlet.

In one embodiment, the first raw material and the second raw material are alpha-olefins, including at least one of ethylene, propylene, 1-butene, 4-methyl-1-pentene, 1-hexene and 1-octene A sort of.

The present invention also provides a method for mixing and distributing olefins. The method uses the above-mentioned device for mixing and distributing olefins. The method includes the following steps:

Step S1: Input the first raw material into the olefin mixing gas distribution device through the raw material inlet on the top of the gas distribution tank;

Step S2: Input the second raw material 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, and the first raw material and the second raw material are mixed in the static mixer. Mix for the first time to obtain the first mixture;

Step S3: the first mixed material is input into the olefin mixing and gas distribution device through the circulation power unit through the circulation inlet, the first mixed material is dispersed through the guide ring and mixed for the second time through the distribution plate to obtain the second mixed material;

Step S4: The mixing result of the second mixture is tested by chromatographic analysis; 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, and the second mixture is from The loop exits and enters the static mixer for remixing.

The olefin mixing gas distribution device of the present invention can be used for the sufficient mixing of different olefin comonomers, so that the composition of the obtained mixed gas is more uniform, which is conducive to improving the component homogeneity of the copolymer; and, the mixed gas obtained in the present invention The gas can be dispersed into the slurry system from the gas outlet on the stirring paddle at the bottom of the reactor, thereby increasing the concentration of the polymerized monomer in the slurry system and increasing the contact amount between the polymerized monomer and the catalyst, which is closer to the slurry method The polymerization environment of the industrial production device improves the accuracy of the evaluation test device for the evaluation of catalyst activity in the slurry method ethylene polymerization, and can provide basic data for the pilot polymerization device of the slurry method, greatly improving the efficiency of the pilot polymerization device and reducing costs. The operation of the slurry pilot plant, the development of the polymerization process and the technical service of the production plant have important guiding significance.

Description of drawings

Figure 1 is a schematic structural view of an embodiment of an olefin mixing and gas distribution device of the present invention.

Among them, reference signs:

Gas distribution tank 1

Cycle power unit 2

Chromatography 3

Distribution board 4

Guide ring 5

Raw material entrance 6

Mixed gas outlet 7

Circular exit 8

Temperature detection port 9

Pressure detection port 10

The bottom is equipped with a circulation inlet 11

discharge port 12

Heating device 13

static mixer 14

Olefin feed port 15

Detailed ways

The olefin mixing and gas distribution device and method of the present invention will be further described below in conjunction with the accompanying drawings.

Please refer to Fig. 1, Fig. 1 is a structural schematic diagram of an embodiment of the olefin mixing gas distribution device of the present invention, the olefin mixing gas distribution device of the present invention includes a gas distribution tank 1, a guide ring 5, a distribution plate 4, and a static mixer 14 , olefin feed port 15 and cycle power unit 2.

The gas distribution tank 1 is used to mix and distribute the raw materials, which include at least two α-olefins, such as but not limited to ethylene, propylene, 1-butene, 4-methyl-1-pentene, 1 -A mixture of at least two of hexene and 1-octene. The top of the gas distribution tank 1 is provided with a chromatography 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 the gas distribution tank 1 is provided with a circulation inlet 11 and a discharge port 12 .

The raw material inlet 6 is the first raw material or nitrogen gas inlet, used for adding the first raw material or nitrogen purging. The first raw material can be a single substance or a mixture, for example, the first raw material is at least one of ethylene, propylene, 1-butene, 4-methyl-1-pentene, 1-hexene and 1-octene It can also be a mixture of at least two of ethylene, propylene, 1-butene, 4-methyl-1-pentene, 1-hexene and 1-octene.

The mixed gas outlet 7 is the prepared mixed gas outlet, which is used to deliver the mixed gas to a downstream olefin copolymerization device or to take samples.

The circulation outlet 8 is used to output the recycled olefins to the circulation pipeline, and preferably, the exterior of the circulation pipeline is provided with an insulating material.

The temperature detection port 9 is used to detect the temperature of the gas distribution tank 1, which is convenient for controlling the conversion of all liquid olefins into gaseous states.

The pressure detection port 10 is used to detect the pressure of the gas distribution tank 1, so as to control the conversion of all liquid olefins into a gas state, and at the same time meet the pressure range of the downstream olefin copolymerization device.

Chromatography 3 is used for online measurement of gas components and their content in gas distribution tank 1 to ensure that the obtained mixed gas meets the test requirements.

Preferably, the gas distribution tank 1 is also provided with a heating device 13 , and the heating device 13 can be arranged inside or on the outer wall of the gas distribution tank 1 . When the heating device 13 is arranged inside the gas distribution tank 1, the heating device 13 includes at least one of water bath heating equipment, steam heating equipment, oil bath heating equipment, electric heating equipment and light wave heating equipment. When the heating device 13 is arranged 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.

The olefin feed port 15 is arranged between the static mixer 14 and the circulation outlet 8, the olefin feed port 15 is a second raw material inlet, and it is used to add the second raw material that needs to be mixed. The second raw material is preferably an olefin, including ethylene, At least one of propylene, 1-butene, 4-methyl-1-pentene, 1-hexene and 1-octene, most preferably a liquid olefin.

The static mixer 14 is arranged between the olefin feed port 15 and the cycle 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 feed port 15 for the first time to obtain first mix.

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

The circulation inlet 11 is used to input the first mixed material to the gas distribution tank 1 .

The discharge port 12 is used to remove remaining materials or to purge the gas distribution tank 1 .

The guide ring 5 is arranged 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 circulation power unit 2, which can improve the mixing effect.

The distribution plate 4 is located inside the gas distribution tank 1, and is positioned above the diversion ring 5; the distribution plate 4 is used for mixing the first mixed material dispersed by the flow ring 5, and the structure of the distribution plate 4 preferably makes the lower mixed material more disordered The distribution form, in order to improve the mixing effect. The first mixed material is dispersed through the guide ring 5 and secondly mixed through the distribution plate 4 to obtain the second mixed material.

When the olefin mixing gas distribution device of the present invention is in use, firstly, according to the physical properties of the raw material, the temperature and pressure are set, and the first raw material is input into the olefin mixing gas distribution device through the raw material inlet 6 at the top of the gas distribution tank 1, and the heating device 13 heats it. To the set temperature, the second raw material is input into the static mixer 14 through the olefin feed port 15, and 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 The raw materials are mixed for the first time in the static mixer 14 to obtain the first mixed material; the first mixed material is input into the olefin mixing gas distribution device through the circulation power unit 2 through the circulation inlet 11, and the first mixed material is dispersed through the guide ring 5 and The second mixing is carried out through the distribution plate 4 to obtain the second mixed material; the mixed result of the second mixed material is analyzed and tested by chromatography 3 . If the mixing result is qualified, the second mixed material is output from the mixed gas outlet 7, and enters the downstream olefin polymerization device for copolymerization; if the mixed result is unqualified, the second mixed material is output from the circulation outlet 8 and input to the static mixer 14 for re- For mixing, the circulation power unit 2 provides power for the circulation of materials.

The olefin mixed gas distribution method provided by the present invention adopts the above-mentioned olefin mixed gas distribution device, and the method includes the following steps:

Step S1: Input the first raw material into the olefin mixing gas distribution device through the raw material inlet on the top of the gas distribution tank;

Step S2: Input the second raw material 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, and the first raw material and the second raw material are mixed in the static mixer. Mix for the first time to obtain the first mixture;

Step S3: the first mixed material is input into the olefin mixing and gas distribution device through the circulation power unit through the circulation inlet, the first mixed material is dispersed through the guide ring and mixed for the second time through the distribution plate to obtain the second mixed material;

Step S4: The mixing result of the second mixture is tested by chromatographic analysis; 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, and the second mixture is from The loop exits and enters the static mixer for remixing.

The embodiments of the present invention are described in detail below: the present embodiment is implemented under the premise of the technical solution of the present invention, and detailed implementation methods and processes are provided, but the protection scope of the present invention is not limited to the following embodiments, the following The experimental method that does not indicate specific condition in the embodiment, generally according to routine condition.

Source of raw material or equipment:

Evaluation analysis method:

Polymerization activity was calculated by the following method:

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

Example 1:

Add ethylene and propylene into the gas distribution tank through the raw material inlet, prepare a mixed gas at 30°C according to the ratio of ethylene to propylene molar ratio of 49/1, and prepare the mixed gas for use.

Use the prepared mixed gas to evaluate the Z-N catalyst, and the specific steps are as follows:

Add nitrogen into the 2L polymerization reactor from the gas feed port until the gauge pressure is 0.3MPa, evacuate the polymerization reactor through the vent and vacuum port, and replace it repeatedly 8 times, then feed nitrogen gas until the gauge pressure is 0MPa; open the vent , put 0.8L dispersant n-hexane into the polymerization reactor from the catalyst feed port; close the vent, adjust the stirring speed to 200r/min, use the temperature control system to raise the temperature of the polymerization reactor to 85°C; reduce the stirring speed to 50r/min, with 0.2L dispersant n-hexane, co-catalyst triethylaluminum and 10mg Z-N catalyst are rushed into the polymerization reactor through the catalyst feeding port, and the addition of triethylaluminum is Al/Ti (mol)=100; Adjust the rotation speed of the device to 200r/min; add 0.2MPa of hydrogen through the gas inlet on the basis of the internal pressure of the polymerization reactor, and then add a mixture of 1.0MPa ethylene and propylene to the reaction pressure to start the polymerization reaction; After lowering the reaction for 3 hours, stop adding ethylene; use the temperature control system to lower the temperature of the polymerization reactor to 20°C, open the vent to vent the gas in the reactor, add nitrogen to replace it for 5 times, open the outlet to release the reaction product, and separate the dispersant. The polymer product is obtained after alkane. The test results are shown in Table 1.

Example 2:

The same method as in Example 1 was used to evaluate the Z-N catalyst, except that the mixed gas was prepared at 30° C. according to the molar ratio of ethylene and propylene of 48/2. The specific experimental conditions and experimental results are shown in Table 1.

Example 3:

The same method as in Example 1 was used to evaluate the Z-N catalyst, except that the mixed gas was prepared at 60°C according to the molar ratio of ethylene to 1-butene of 49/1. The specific experimental conditions and experimental results are shown in Table 1.

Example 4:

The same method as in Example 1 was used to evaluate the Z-N catalyst, except that the mixed gas was prepared at 60°C according to the molar ratio of ethylene to 1-butene of 48/2. The specific experimental conditions and experimental results are shown in Table 1.

Example 5:

The same method as in Example 1 was used to evaluate the Z-N catalyst, except that the mixed gas was prepared at 85°C according to the ratio of ethylene to 1-hexene molar ratio of 49/1. The specific experimental conditions and experimental results are shown in Table 1.

Embodiment 6:

The same method as in Example 1 was used to evaluate the Z-N catalyst, except that the mixed gas was prepared at 85°C according to the ratio of ethylene to 1-hexene molar ratio of 48/2. The specific experimental conditions and experimental results are shown in Table 1.

Comparative example 1:

The same method as in Example 1 is used to evaluate the Z-N catalyst, the difference is that the structure of the existing hybrid gas distribution device is different, and the hybrid gas distribution device of this comparative example is a gas distribution tank provided with a heating unit, and there is no guide ring, Distributor plate, no static mixer and circulation power unit, the specific experimental conditions and experimental results are shown in Table 1.

Comparative example 2:

The same method as Comparative Example 1 was used to evaluate the Z-N catalyst, except that the mixed gas was prepared at 30°C according to the ratio of ethylene to propylene molar ratio of 48/2. The specific experimental conditions and experimental results are shown in Table 1.

Comparative example 3:

The same method as Comparative Example 1 was used to evaluate the Z-N catalyst, except that the mixed gas was prepared at 60°C according to the molar ratio of ethylene to 1-butene of 49/1. The specific experimental conditions and experimental results are shown in Table 1.

Comparative example 3:

The same method as Comparative Example 1 was used to evaluate the Z-N catalyst, except that the mixed gas was prepared at 60°C according to the molar ratio of ethylene to 1-butene of 48/2. The specific experimental conditions and experimental results are shown in Table 1.

Comparative example 5:

The same method as Comparative Example 1 was used to evaluate the Z-N catalyst, except that the mixed gas was prepared at 85°C according to the ratio of ethylene to 1-hexene molar ratio of 49/1. The specific experimental conditions and experimental results are shown in Table 1.

Comparative example 6:

The same method as Comparative Example 1 was used to evaluate the Z-N catalyst. The difference is that the mixed gas was prepared at 85°C according to the molar ratio of ethylene and 1-hexene of 48/2. The specific experimental conditions and experimental results are shown in Table 1. .

The experimental condition and experimental result of table 1 embodiment and comparative example

As can be seen from the data in Table 1, compared with the existing mixed gas distribution device, under the same gas distribution temperature and gas distribution ratio conditions, the composition of the mixed gas obtained by the olefin mixed gas distribution device of the present invention is more uniform, and the present invention The olefin mixing and gas distribution device realizes the premixing of olefin comonomers, which can more accurately evaluate the activity of polyolefin catalysts when it is used in the subsequent evaluation of polyolefin catalysts, and greatly improve the use efficiency and operation safety of the pilot polymerization device sex.

The above description is only a preferred embodiment of the present invention, it should be noted that for those of ordinary skill in the art, without departing from the premise of the present invention, some improvements can also be made, and these improvements should also be regarded as the invention. protected range.

Claims (10)

1. An olefin mixing and gas distribution device, which is characterized by comprising:

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 of the gas distribution tank is provided with a circulating inlet;

the 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 positioned above the guide ring;

the static mixer is connected with a circulation outlet at the top of the gas distribution tank and the circulation inlet at the bottom of the gas distribution tank;

an olefin feed inlet arranged between the static mixer and the circulation outlet; and

and the circulating power unit is arranged between the static mixer and the circulating inlet.

2. The olefin mixing and gas distribution device according to claim 1, further comprising a chromatograph disposed on top of the gas distribution tank.

3. The olefin mixing and gas distribution device according to claim 1, further comprising a heating device provided inside the gas distribution tank; the heating device comprises at least one of water bath heating equipment, steam heating equipment, oil bath heating equipment, electric heating equipment and light wave heating equipment.

4. The olefin mixing and gas distribution device according to claim 1, further comprising a heating device arranged on the outer wall of the gas distribution tank; the heating device comprises at least one of an electric heating belt and an electric heating sleeve.

5. The olefin mixing and gas distribution device according to claim 1, further comprising a temperature detection port, a pressure detection port and a discharge port, wherein the temperature detection port and the pressure detection port are arranged at the top of the gas distribution tank, and the discharge port is arranged at the bottom of the gas distribution tank.

6. The olefin mixing and gas distribution device according to claim 1, wherein the circulating power unit is a pump or a compressor.

7. The olefin mixing and gas distribution device according to claim 1, wherein the feed inlet is a first feed or nitrogen inlet for adding the first feed or nitrogen purging.

8. The olefin mixing and gas distribution device according to claim 1, wherein the olefin feed inlet is a second feed inlet.

9. The olefin mixing and gas distribution device according to claim 7 or 8, wherein the first feedstock and the second feedstock are alpha-olefins, including at least one of ethylene, propylene, 1-butene, 4-methyl-1-pentene, 1-hexene and 1-octene.

10. An olefin mixing and gas distribution method, characterized in that an olefin mixing and gas distribution device according to any one of claims 1 to 9 is adopted, and the method comprises the following steps:

step S1: inputting the first raw material into an olefin mixing and gas distribution device through a raw material inlet at the top of a gas distribution tank;

step S2: inputting the second feedstock into a static mixer through an olefin feed inlet; outputting a first raw material in the olefin mixing and distributing device from a circulating outlet and entering a static mixer, and mixing the first raw material and a second raw material for the first time in the static mixer to obtain a first mixture;

step S3: the first mixture is input into an olefin mixing and air distributing device through a circulating power unit through a circulating inlet, and the first mixture is dispersed through a guide ring and is mixed for the second time through a distribution plate to obtain a second mixture;

step S4: testing the mixed result of the second mixture through chromatographic analysis; if the mixing result is qualified, outputting the second mixture from the mixed gas outlet, and entering a downstream process; if the mixing result is not qualified, returning to the step S2, outputting the second mixture from the circulation outlet and inputting the second mixture into the static mixer for re-mixing.

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