Improved efficient mixing device for feed gas before propylene oxidation

Abstract

Belonging to the field of propylene oxidation raw material mixing, the invention provides an improved efficient raw material gas mixing device before propylene oxidation, which comprises a mixer main body and a preprocessor, the preprocessor is fixedly connected with the input end of the mixer main body in an axially opposite manner, and the preprocessor comprises a pipeline, one end of the pipeline is provided with a first input end connected with an input pipeline of gas A, at least one second input end is formed on the pipe wall of the pipeline, the two ends of the second input end are open, and the opening in one end is connected with an input pipeline of gas B. According to the invention, by changing the layout of dominant areas of different components of a gas raw material before propylene oxidation before entering the mixer main body, the change of the mixing state of a section of path after the mixed gas enters the mixer main body can be replaced, so that the mixing efficiency of the gas after entering the mixer main body can be accelerated; and the necessary axial length of the mixer main body required for fully mixing different gases is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of propylene oxidation raw material mixing, in particular to an improved high-efficiency mixing device for raw material gas before propylene oxidation. Background Art

[0002] Catalytic oxidation of propylene is one of the main ways to synthesize acrolein. Before the raw materials of the reaction components are introduced into the solidified bed reactor for reaction, the raw materials before oxidation need to be mixed uniformly.

[0003] The raw materials for propylene oxidation mainly include propylene as the main reactant and oxygen. Oxygen can come from air. In addition, it also includes water vapor and nitrogen. Water vapor is used to suppress deep oxidation side reactions, and nitrogen is used to reduce the concentration of combustible gases, avoid explosion limits, and balance the airflow distribution in the reactor. Static mixers are used to mix multiple gases. The static mixer has the characteristic of no moving parts inside. By allowing the fluid to flow in the pipeline and impact various types of plate elements, the velocity gradient of the fluid laminar motion is increased or turbulence is formed. In order to ensure sufficient mixing of the raw materials, there are generally two improvement strategies. One is to extend the pipeline length to increase the number of collisions between the oxidizing raw materials and the internal static plate elements. The other is to increase the structural complexity of the internal static plate elements to make it easier to rotate, shear and split the raw materials at the same length. The former has a limited upper limit on improving the mixing efficiency and has a greater negative impact, such as occupying more space; the latter has limited room for improvement and deformation, and the effort is not proportional to the reward.

[0004] Therefore, we propose an improved high-efficiency mixing device for raw gas before propylene oxidation to solve the above problems. Summary of the Invention

[0005] In view of the shortcomings of the prior art, the present invention provides an improved high-efficiency mixing device for raw gas before propylene oxidation to solve the problems raised in the above background technology.

[0006] The objectives of the present invention can be achieved through the following technical solutions: it includes a mixer body and a preprocessor, the preprocessor is fixedly connected to the input end of the mixer body in an axially opposite manner, the preprocessor includes a pipeline, one end of the pipeline is provided with a first input end connected to the input pipeline of gas A, and at least one second input end is formed on the pipe wall of the pipeline, the second input end is open at both ends, one end of which is connected to the input pipeline of gas B, a gas dispersion frame is provided in the preprocessor, the gas dispersion frame has first and second chambers distributed in an alternating manner, the second chambers are interconnected and connected to one end opening of the second input end, and multiple first chambers are all connected to the first input end, so that the gas B introduced from the second input end can be diffused into multiple second chambers; the gas A introduced from the first input end can be diffused into multiple first chambers, thereby achieving that the dominant areas occupied by gas A and gas B respectively are always introduced into the mixer body in an alternating manner on the cross section perpendicular to the radial direction and mixed.

[0007] As a preferred embodiment of the present invention, connecting channels are formed between different second chambers, and the connecting channels are configured to distribute the gas B introduced from the second input end to all the second chambers.

[0008] As a preferred embodiment of the present invention, the second chamber and the first chamber are distributed in parallel and staggered in the gas dispersion frame, and the second chamber is set to be closed in the direction toward the inlet of gas A and open in the direction away from the inlet of gas A.

[0009] As a preferred embodiment of the present invention, the cross-sectional shape of the second chamber can be an ellipse or a polygon.

[0010] As a preferred embodiment of the present invention, connecting channels are formed between different second chambers, and the connecting channels are configured to distribute the gas A introduced from the second input end to all the second chambers.

[0011] As a preferred embodiment of the present invention, a first positioning end point is formed at a position of the outer wall of the second chamber that is far away from each other, and a second positioning end point is formed at a corresponding position in the tube wall of the preprocessor.

[0012] As a preferred embodiment of the present invention, the second positioning endpoint includes a cross-section with a groove, which extends to both sides in the axial direction of the preprocessor to form a strip structure, and a step can be formed on the side away from the mixer body. One of the end faces of the gas dispersion frame in the axial direction of the preprocessor extends radially outward along the outer contour line of the outer wall of the second chamber and the connecting side wall to form a positioning shoulder. The positioning shoulder is constructed so that after the gas dispersion frame enters the preprocessor through the first positioning endpoint and the second positioning endpoint, it can be adaptively accommodated in the corresponding step, thereby closing the groove formed by the step, so that the end face of the gas dispersion frame with the positioning shoulder can be flush with the corresponding end face of the preprocessor.

[0013] As a preferred embodiment of the present invention, the second chamber and the first chamber are staggered and distributed in a substantially circumferential manner within the gas dispersion frame.

[0014] As a preferred embodiment of the present invention, the second chamber has at least one convex portion.

[0015] As a preferred embodiment of the present invention, the outer shell of the second chamber has a slope.

[0016] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects: 1. By changing the layout of the dominant areas occupied by different components of the gas raw material before propylene oxidation enters the mixer body, the mixing state change of the original mixed gas starting from a section of the path after entering the mixer body can be replaced, thereby accelerating the mixing efficiency of the gas after entering the mixer body and reducing the necessary axial length of the mixer body required for fully mixing different gases.

[0017] 2. The gas dispersion rack is detachably connected to the pre-processor, which facilitates maintenance or replacement of the distribution pattern of the first chamber and the second chamber in the gas dispersion rack corresponding to the desired internal gas cross-sectional distribution. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] To facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 is a schematic cross-sectional view of some embodiments of the present invention; Figure 3 This is a schematic diagram of a three-dimensional enlarged cross-sectional structure of the pre-processor in the present invention, wherein the pre-processor comes from Figure 2 Embodiments of Figure 4This is a schematic diagram of a three-dimensional enlarged cross-sectional structure of the gas dispersion rack in the present invention, wherein the gas dispersion rack comes from Figure 2 Embodiments of Figure 5 This is a schematic diagram of the three-dimensional enlarged structure of the gas dispersion rack in the present invention, wherein the gas dispersion rack comes from Figure 2 Embodiments of Figure 6 is a schematic diagram of an enlarged cross-sectional structure of the cooperation between the pre-processor and the gas dispersion rack in some embodiments of the present invention; Figure 7 This is a schematic diagram of a three-dimensional enlarged cross-sectional structure of the pre-processor in the present invention, wherein the pre-processor comes from Figure 6 Embodiments of Figure 8 This is a schematic diagram of the three-dimensional enlarged structure of the gas dispersion rack in the present invention, wherein the gas dispersion rack comes from Figure 6 Embodiments of Figure 9 This is a three-dimensional first-angle cross-sectional enlarged structural diagram of the gas dispersion rack in the present invention, wherein the gas dispersion rack comes from Figure 6 Embodiments of Figure 10 This is a schematic diagram of a three-dimensional, second-angle cross-sectional enlarged structure of the gas dispersion rack of the present invention, wherein the gas dispersion rack comes from Figure 6 Embodiments of Figure 11 This is a schematic diagram of a three-dimensional, cross-sectional, and enlarged structure of a pre-processor and a gas dispersion rack in a modified embodiment of the gas dispersion rack of the present invention; Figure 12 This is a schematic diagram of the three-dimensional enlarged structure of the gas dispersion rack in the present invention, wherein the gas dispersion rack comes from Figure 11 Embodiments of Figure 13 This is the flow chart of catalytic oxidation of propylene.

[0020] In the figure: 1. mixer body; 2. preprocessor; 3. gas dispersion frame; 4. first chamber; 5. second chamber; 6. first input end; 7. second input end; 8. connecting channel; 9. first positioning end point; 10. first entry channel; 11. second positioning end point; 12. baffle; 13. step; 14. positioning shoulder; 15. raw material preheater; 16. oxidation reactor; 17. convex portion; 18. inlet end; 19. outlet end; 20. second entry channel; 21. outlet channel; 22. closed end; 23. inclined surface; 24. mesh partition. DETAILED DESCRIPTION

[0021] The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the context of this disclosure, "a group" means two or more, unless otherwise specifically defined.

[0023] Throughout this specification, when a device is said to be "connected" to another device, this includes not only "direct connection" but also "indirect connection" with other elements interposed therebetween. Furthermore, when a device is said to "include" a certain component, unless otherwise stated, this does not exclude the inclusion of other components but rather implies that the device may include other components.

[0024] Although the terms first, second, etc. are used in some examples herein to refer to various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first interface and a second interface, etc. are represented. Furthermore, as used herein, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context indicates otherwise.

[0025] Although not defined differently, all terms used herein, including technical and scientific terms, have the same meanings as those generally understood by those skilled in the art to which this disclosure belongs. Terms defined in commonly used dictionaries are additionally interpreted as having meanings consistent with relevant technical literature and the current message. Unless otherwise defined, they should not be overly interpreted as ideal or highly formalized meanings.

[0026] Based on a detailed analysis of a typical static mixer, two homogeneous gases are introduced and the mixing dynamics of gas molecules in the mixer are simulated.

[0027] By analyzing the simulated gas molecule distribution at different cross-sections of the mixer, it was found that under the action of the plate elements in the static mixer, the gases of different homogeneous phases mainly experienced positional rearrangement in the initial stage, that is, the mixing of gases of different homogeneous phases, forming a larger area of ​​dominant areas of each type of gas.

[0028] For example, two gases to be mixed have their respective dominant regions arranged in an alternating pattern. However, currently used piping components can only ensure that the gas components are transported in a constant manner, occupying a fixed axial space in the pipeline. This transport method results in the mixed gas entering the static mixer having to travel a certain distance before forming a cross-sectional shape suitable for shearing and splitting.

[0029] See also Figures 1-13 As shown, an improved high-efficiency mixing device for raw material gas before propylene oxidation includes a mixer body 1 and a pre-processor 2. The pre-processor 2 is fixedly connected to the input end of the mixer body 1 in an axially opposite manner, for example, it can be connected in the form of a flange.

[0030] The pre-processor 2 includes a pipeline extending in both directions in the axial direction of the mixer body 1. One end of the pipeline is directly opposite to the mixer body 1. The other end of the pipeline is provided with a first input end 6 that can be connected to an input pipe of a type of gas A. The pipeline has a closed annular wall. The specific shape of the closed annular wall can be circular. At least one second input end 7 is formed on the tube wall, and the second input end 7 is open at both ends, one of which can be connected to the input pipe of the second type of gas B. It can be understood that the second input end 7 can be provided with two, three or a certain number. Preferably, the second input end 7 is set to two, and the two second input ends 7 are distributed on the tube wall in a manner that the axes are opposite to each other. It can be understood that the second input end 7 may also be distributed in a manner that the axes are not opposite to each other, such as: the axes of the two second input ends 7 form a certain spatial angle in different planes / the same plane.

[0031] The pre-processor 2 is provided with a gas dispersion rack 3 for passing gas A into gas B in a substantially staggered manner for dispersion. The gas dispersion rack 3 is accommodated in the pre-processor 2 and has a plurality of first chambers 4 and second chambers 5 therein, wherein the first chambers 4 and the second chambers 5 are substantially staggeredly distributed in the gas dispersion rack 3. The first chamber 4 is used to allow gas A to enter the mixer body 1 through the preprocessor 2, and the second chamber 5 is used to disperse gas B into gas A while blocking the entry of gas A. The second chamber 5 is set to be closed in the direction of gas A and open in the direction away from gas A. Connecting channels 8 are formed between different second chambers 5 , and the connecting channels 8 are configured to distribute the gas B introduced from the second input port 7 to all the second chambers 5 .

[0032] In some embodiments of the present invention: The second chamber 5 and the first chamber 4 are staggered and distributed in a basically parallel manner in the gas dispersion frame 3. The cross-sectional area formed by the second chamber 5 in the radial direction of the first input end 6 can be different, wherein the closer the second chamber 5 is to the center of the circle in the radial direction of the first input end 6, the larger the cross-sectional area formed, and has a tendency to continuously decrease in the direction away from the center of the circle.

[0033] The cross-sectional shape of the second chamber 5 may be an ellipse or a polygon, such as a rectangle, an ellipse or a triangle. Preferably, the cross-sectional shape of the second chamber 5 may be an ellipse.

[0034] The second chamber 5 has an outer wall, which is formed by extending the cross-sectional shape in the axial direction of the first input end 6. Connecting side walls are radially distributed between the outer walls of adjacent second chambers 5. The area enclosed by the connecting side walls and the outer walls of adjacent second chambers 5 is the first chamber 4. A first inlet channel 10 for gas B is formed on the outer wall of at least one of the two second chambers 5 closest to the inner cross-section of the preprocessor 2 tube wall. The first inlet channel 10 can be connected to the second input end 7 in a sealed manner.

[0035] The contour line connecting the side walls may be a straight line or a curve. For example, the contour line connecting the side walls is an arc line equidistant from the inner cross section of the tube wall of the pre-processor 2 .

[0036] An opening may be formed on the connecting side wall, and the opening is used to connect the first chamber 4 with the flow path of the gas A in the space in the preprocessor 2 not occupied by the gas dispersion frame 3.

[0037] The gas dispersion frame 3 includes an outer wall constituting the second chamber 5 and a connecting side wall connecting the outer walls of adjacent second chambers 5, wherein a baffle 12 is formed at one end of the second chamber 5 away from the mixer body 1. The baffle 12 has the same cross-sectional shape as the second chamber 5, and the baffle 12 causes the second chamber 5 to be in a closed state on the side away from the mixer body 1.

[0038] In some embodiments, a first positioning endpoint 9 may be formed at a position on the outer wall of the second chamber 5 that is far away from each other, and a second positioning endpoint 11 may be formed at a corresponding position inside the tube wall of the preprocessor 2, wherein the first positioning endpoint 9 may be a protrusion protruding outward, and the second positioning endpoint 11 may be a depression formed from the axis toward the inner wall of the tube wall, and the positioning of the gas dispersion rack 3 inside the preprocessor 2 can be achieved by cooperating between the protrusion and the depression.

[0039] When the cross section of the second chamber 5 is selected to be an ellipse, the first positioning end points 9 on both sides thereof can be constituted by the two ends of the ellipse in the long axis direction.

[0040] The second positioning end point 11 includes a cross section with a groove, and the cross section extends to both sides in the axial direction of the preprocessor 2 to form a strip structure. A step 13 may be formed on the side away from the mixer body 1. The step 13 may be a groove formed from the side of the preprocessor 2 to the side of the mixer body 1. One end surface of the gas dispersion frame 3 in the axial direction of the pre-processor 2 extends radially outward along the outer contour line of the outer wall of the second chamber 5 and the connecting side wall to form a positioning shoulder 14; The positioning shoulder 14 is configured to be adaptively accommodated in the corresponding step 13 after the gas dispersion rack 3 enters the preprocessor 2 through the first positioning endpoint 9 and the second positioning endpoint 11, thereby closing the groove formed by the step 13, so that the end face of the gas dispersion rack 3 with the positioning shoulder 14 on the side can be flush with the corresponding end face of the preprocessor 2.

[0041] The positional relationship between the positioning shoulder 14 and the first entry channel 10 should satisfy the following: when the positioning shoulder 14 is closed in the step 13, the opening at one end of the first entry channel 10 is exactly aligned with the second input end 7, so that the gas dispersion rack 3 can be fixed at a specific position in the preprocessor 2 through the opening on one side of the first entry channel 10, ensuring that gas B can smoothly enter the second chamber 5, and through the action of the baffle 12, flow to the side of the opening in the second chamber 5, and mix with the gas A entering from the first input end 6, forming a staggered arrangement of the dominant areas of gas A and gas B, laying the foundation for the subsequent fully mixed mixing effect.

[0042] During the catalytic oxidation of propylene, propylene and air (containing a fixed ratio of water vapor, nitrogen, and oxygen) are first introduced into the mixing device for mixing. The mixed gas then enters the raw material preheater 15 to be heated to a suitable temperature. It is then introduced into the oxidation reactor 16 for oxidation reaction, and the oxidation product is finally discharged. In the above example, gas A can be propylene gas and gas B can be air, but those skilled in the art will understand that the components of gas A and gas B can also be exchanged, that is, gas A is air and gas B is propylene gas, which is also applicable to the mixing device, but it is best to set the gas that accounts for a smaller proportion of the total volume after mixing as gas B, that is, to be introduced from the second input end 7 to ensure that its dominant area before entering the mixer body 1 after mixing with gas B is relatively small, so that the dominant area formed by it can be relatively stable.

[0043] Secondly, to prevent gas A and gas B from communicating with each other through the connected first input end 6 and second input end 7, a one-way valve and a pump body should be connected to the pipeline containing gas A and the pipeline containing gas B.

[0044] In some deformable embodiments, the cross section of the second chamber 5 is configured into an irregular shape, including a substantially corresponding regular shape, such as an ellipse, a polygon, etc. On the basis of this shape, the cross section of the second chamber 5 is curved in the radial direction as a whole to form at least one convex portion 17. Two convex portions 17 may be formed on the same second chamber 5. The two convex portions 17 may be spaced apart and curved toward the same side on the cross section of the second chamber 5 to form a W-shape, or may be spaced apart and curved toward different sides in the radial direction to form a second chamber 5 that is generally distributed in a wavy shape in the radial direction. In a specific embodiment illustrated in the figure, the second chamber 5 has a convex portion 17, and the convex portions 17 on the upper second chamber 5 and the lower second chamber 5, which are framed along a horizontal line, are bent away from each other to form a larger intermediate space. A second chamber 5 having a substantially regular cross-section is correspondingly formed in the intermediate space. In this specific embodiment, the dominant area of ​​the corresponding gas formed in the pipeline where all the second chambers 5 are located is closer to the actual gas distribution after mixing for a period of time in the static mixer. Therefore, it can be understood that the design with the protrusion 17 has a more positive effect on accelerating gas mixing.

[0045] In other embodiments of the present invention: The second chamber 5 and the first chamber 4 are basically circumferentially staggered in the gas dispersion frame 3, and the angle of the circumferential distribution can be adjusted according to actual needs. It can be understood that a relatively larger number of second chambers 5 can more densely introduce gas B into gas A to form an initial state in which the dominant areas of different gases appear to be more densely staggered.

[0046] In some embodiments, the gas dispersion rack 3 includes a second inlet channel 20, the second inlet channel 20 having at least one inlet end 18 and an outlet end 19, the axes of the inlet end 18 and the outlet end 19 may be arranged in an orthogonal manner, wherein the axis of the inlet end 18 may be in a direction co-linear with the axial direction of the second input end 7; The inlet end 18 and the outlet end 19 both have a tubular outer wall of a certain length. The outlet end 19 serves as the connecting channel 8. If there is only one inlet end 18, a right-angle pipeline with an arc will be formed at the connection between the inlet end 18 and the outlet end 19. If there are two or more inlet ends 18, a structure in which the outlet end 19 invades the outer wall of the inlet end 18 pipeline will be formed at the connection between the outlet end 19 and the inlet end 18.

[0047] In some embodiments, the second chamber 5 has a closed shell, one side of the shell is set as an arc surface that fits with the outlet end 19, and the side on the arc surface and the end side close to the mixer body 1 are both set as openings. The outer wall of the shell and the outlet end 19 together enclose to form the second chamber 5.

[0048] Furthermore, the outlet end 19 has a closed end 22 with a closed cross-section. The closed end 22 is used to prevent the gas B from flowing over a long range in the axial direction of the outlet end 19 so that the gas B can be introduced into the second chamber 5 more quickly.

[0049] The inner wall of the pipe at the outlet end 19 is circumferentially distributed with an outlet channel 21, which is opposite to the outer shell opening of the adjacent second chamber 5. It can be understood that the gas B introduced from the inlet end 18 can be introduced into the second chamber 5 through the outlet channel 21 on the outlet end 19 for dispersion.

[0050] Furthermore, the outer shell of the second chamber 5 has a slope 23, and one end side of the slope 23 starts from the side that is in contact with the arc surface of the outer wall of the outlet end 19 and extends in the direction away from the outer wall of the outlet end 19, wherein the end side away from the arc surface of the outer wall of the outlet end 19 is closer to the direction of the mixer body 1 than the end side close to the arc surface of the outer wall of the outlet end 19.

[0051] The inclined surface 23 can provide the gas B with a velocity inclined to the axial direction of the first input end 6 when entering the second chamber 5, thereby facilitating the diffusion of the gas B in the second chamber 5; Optionally, a mesh partition 24 inclined corresponding to the inclined surface 23 is formed in the second chamber 5. The mesh partition 24 can further increase the difficulty of gas B flowing directly axially along the first input end 6, so that gas B can be further extended and distributed radially in the second chamber 5, thereby expanding to the entire second chamber 5.

[0052] It can be understood that the outer shell of the second chamber 5 may also form at least one convex portion 17 in the radial direction. In this embodiment, the convex portion 17 causes the outer shell of the second chamber 5 to form a W-shaped or wavy structure in the radial direction.

[0053] Those skilled in the art can further understand that by changing the layout of the gas-dominated areas before different gases enter the mixer body 1, the mixing state of the original gas in the first section of the path before entering the mixer body 1 can be replaced, thereby accelerating the mixing efficiency of the gas after entering the mixer body 1 and reducing the necessary axial length of the mixer body 1 required to fully mix the different gases.

[0054] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to specific embodiments. Obviously, many modifications and variations are possible based on the contents of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. An improved high-efficiency mixing device for raw material gas before propylene oxidation, comprising a mixer body (1) and a pre-processor (2), wherein the pre-processor (2) is fixedly connected to the input end of the mixer body (1) in an axially opposed manner, characterized in that: The preprocessor (2) includes a pipeline, one end of which is provided with a first input end (6) connected to an input pipeline of gas A, and at least one second input end (7) is formed on a pipe wall of the pipeline, the second input end (7) is open at both ends, one of the openings being connected to an input pipeline of gas B, and a gas dispersion rack (3) is provided in the preprocessor (2), wherein the gas dispersion rack (3) has staggered first chambers (4) and second chambers (5), the second chambers (5) are interconnected and connected to an opening at one end of the second input end (7), and the plurality of first chambers (4) are all connected to the first input end (6), so that the gas B introduced from the second input end (7) can diffuse into the plurality of second chambers (5); and the gas A introduced from the first input end (6) can diffuse into the plurality of first chambers (4), thereby achieving that the dominant areas respectively occupied by gas A and gas B are always introduced into the mixer body (1) in a staggered manner on a cross section perpendicular to the radial direction for mixing.

2. The improved high-efficiency mixing device for raw gas before propylene oxidation according to claim 1, characterized in that: Connecting channels (8) are formed between different second chambers (5), and the connecting channels (8) are configured to distribute the gas B introduced from the second input end (7) to all the second chambers (5).

3. The improved high-efficiency mixing device for raw gas before propylene oxidation according to any one of claims 1 or 2, characterized in that: The second chamber (5) and the first chamber (4) are distributed in parallel and staggered in the gas dispersion frame (3); the second chamber (5) is configured to be closed in the direction toward the inlet of gas A and to be open in the direction away from the inlet of gas A.

4. The improved high-efficiency mixing device for raw gas before propylene oxidation according to claim 3, characterized in that: The cross-sectional shape of the second chamber (5) can be either elliptical or polygonal.

5. The improved high-efficiency mixing device for raw material gas before propylene oxidation according to claim 3, characterized in that: Connecting channels (8) are formed between different second chambers (5), and the connecting channels (8) are configured to distribute the gas A introduced from the second input end (7) to all the second chambers (5).

6. The improved high-efficiency mixing device for raw gas before propylene oxidation according to any one of claims 4 or 5, characterized in that: A first positioning end point (9) is formed at a position of the outer wall of the second chamber (5) that is away from each other, and a second positioning end point (11) is formed at a corresponding position in the tube wall of the preprocessor (2).

7. The improved high-efficiency mixing device for raw material gas before propylene oxidation according to claim 6, characterized in that: The second positioning end point (11) includes a cross section with a groove, which extends to both sides in the axial direction of the preprocessor (2) to form a strip structure, and a step (13) is formed on the side away from the mixer body (1). One end face of the gas dispersion frame (3) in the axial direction of the preprocessor (2) extends radially outward along the outer contour line of the outer wall of the second chamber (5) and the connecting side wall to form a positioning shoulder (14). The positioning shoulder (14) is constructed so that after the gas dispersion frame (3) enters the preprocessor (2) through the first positioning end point (9) and the second positioning end point (11), it can be adaptively accommodated in the corresponding step (13), thereby closing the groove formed by the step (13) and making the end face of the gas dispersion frame (3) on the side with the positioning shoulder (14) flush with the corresponding end face of the preprocessor (2).

8. The improved high-efficiency mixing device for raw material gas before propylene oxidation according to claim 1, characterized in that: The second chamber (5) and the first chamber (4) are distributed in a substantially circumferentially staggered manner within the gas dispersion frame (3).

9. The improved high-efficiency mixing device for raw gas before propylene oxidation according to any one of claims 1 or 4, characterized in that: The second chamber (5) has at least one protrusion (17).

10. The improved high-efficiency mixing device for raw material gas before propylene oxidation according to claim 8, characterized in that: The outer shell of the second chamber (5) has a slope (23).

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