Reactor catalyst carrying device and tubular reactor thereof

Abstract

The utility model relates to the technical field of chemical equipment, and discloses a reactor catalyst loading device and a tubular reactor thereof, wherein the catalyst loading device comprises two connectors, and the two connectors are arranged in mirror symmetry; the connector comprises a connecting shaft and a connecting rod, the connecting rod is arranged perpendicular to the connecting shaft, and one end of the connecting rod is connected to the connecting shaft, and a plurality of connecting rods are evenly arranged on the same plane; the planes formed by the two connector connecting rods are arranged oppositely, and a loading device is fixedly arranged between the two opposite connecting rods; the loading device is a box-shaped structure, comprising two grids arranged in parallel and at intervals, and the interval between the two grids is used to load the catalyst; the connecting shaft is connected to the rotating device of the reactor. The reactor catalyst loading device is arranged in the tube body, and is rotatably connected to the tube body. The problem of low catalyst processing efficiency of the existing catalyst loading device and tubular reactor and uneven temperature distribution in the reactor is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical equipment, in particular to a reactor catalyst carrying device and a tubular reactor thereof. Background Art

[0002] The statements herein merely provide background art related to the present invention and do not necessarily constitute prior art.

[0003] In the chemical industry, most chemical reactions often require the use of catalysts for catalytic reactions. The selection and use of catalysts directly affects production efficiency and even the quality and yield of products. The way the catalyst is loaded affects the performance and service life of the catalyst in the reactor, as well as the temperature distribution in the reactor. Some catalysts are sensitive to temperature, and the way the catalyst is loaded has a great impact on the catalytic effect and service life of the catalyst.

[0004] In a tubular reactor, solid catalysts are usually directly filled into the tube cavity. This filling method uses a large amount of catalyst, and the catalyst processing capacity per unit volume is low, the catalyst processing efficiency is low, and the catalyst is wasted. In addition, improper catalyst loading will lead to significant differences in heat release and heat transfer in the reaction tube, resulting in uneven temperature distribution in the reactor, which may cause local overheating and catalyst deactivation in severe cases. Utility Model Content

[0005] In view of the deficiencies in the prior art, the purpose of the embodiments of the utility model is to provide a reactor catalyst loading device and a tubular reactor thereof, so as to solve the problems of low catalyst processing efficiency and uneven temperature distribution in the reactor in the existing reactor catalyst loading device.

[0006] In order to achieve the above purpose, the embodiment of the utility model provides the following technical solutions:

[0007] A reactor catalyst loading device comprises two connectors, the two connectors are arranged in mirror symmetry;

[0008] The connector includes a connecting shaft and a connecting rod, the connecting rod is arranged perpendicular to the connecting shaft, one end of the connecting rod is connected to the connecting shaft, and a plurality of connecting rods are evenly arranged on the same plane;

[0009] The planes formed by the connecting rods of the two connectors are arranged opposite to each other, and the carrier is fixedly arranged between the two opposite connecting rods;

[0010] The carrier is a box-shaped structure, including two grids arranged in parallel and at intervals, and the interval between the two grids is used to carry the catalyst;

[0011] The connecting shaft is connected to the rotating device of the reactor.

[0012] The catalyst carrying device of the utility model, the carrying device is used as a container for carrying the catalyst, and the front and rear surfaces are composed of metal grids, so that the reaction liquid flows through the grids of the carrying device in the tube cavity to react with the catalyst. The carrying device is fixed by a connector, so that the carrying device carrying the catalyst radiates outward with the connecting shaft as the axis. When the carrying device rotates in the reactor, it drives the liquid in the reactor to form a vortex, increases the contact area between the reaction liquid and the catalyst per unit time, and improves the catalytic efficiency of the catalyst.

[0013] In some embodiments, the number of connecting rods of the connector is four, the four connecting rods form a cross shape, and the connecting rods are plate-shaped connecting rods.

[0014] In some embodiments, the free end of the connecting shaft is connected to the rotating device of the reactor via a coupling.

[0015] In some embodiments, a regular hexagonal groove is provided at the free end of the connecting shaft and connected to the rotating device of the reactor.

[0016] In some embodiments, the grid is configured as a metal grid with a mesh size of 10-40, and the catalyst is carried in the gap between the two metal grids. The grid allows the catalyst to fully contact with the reaction liquid.

[0017] In some embodiments, the metal grid is configured in a rectangular shape.

[0018] In some embodiments, the plate-shaped connecting rod covers two opposite sides of the carrier and between two metal grids.

[0019] In some embodiments, the other two sides of the carrier are fixedly provided with metal baffles, and the two metal baffles are arranged in parallel between the two metal grids.

[0020] By covering the baffle plate and the plate-shaped connecting rod between the two metal grids, the carrier forms a box structure to prevent the catalyst from leaking out from between the metal grids.

[0021] In some embodiments, a screw hole is set at one end of the plate-like connecting rod away from the connecting shaft, and a screw hole is also set at a corresponding position of the metal baffle. The carrier is fixed on the connecting rod by threaded connection between the screw and the screw hole.

[0022] The utility model embodiment also provides a tubular reactor, comprising a tube body and a reactor catalyst carrying device, wherein the reactor catalyst carrying device is arranged in the tube body, and the tube body is rotatably connected to the reactor catalyst carrying device.

[0023] One or more technical solutions provided in the embodiments of the present utility model have at least the following technical effects or advantages:

[0024] 1. The catalyst carrying device of the utility model evenly disperses the catalyst in the carrier of the mesh grid structure. The catalyst carrying device is arranged in the reactor and can be connected to an external rotating device. The catalyst carrying device rotates under the driving action of an external force, driving the surrounding liquid to form a vortex, thereby increasing the contact area between the reaction liquid and the catalyst per unit time and improving the catalytic efficiency of the catalyst; at the same time, the reaction liquid in the reactor is fully mixed, further improving the reaction efficiency; and the heat transfer efficiency is increased, and the fluid flows back and forth in the catalyst, so that the temperature distribution in the reactor is uniform.

[0025] 2. The catalyst loading device of the utility model is composed of a loading device and a connector, which has a simple structure and is easy to use. The number of loading devices can be matched according to the catalytic efficiency and reaction characteristics of the catalyst, and the use is flexible.

[0026] 3. The utility model is equipped with a tubular reactor with a catalyst carrying device. The rotation of the carrying device causes a strong disturbance of the fluid in the tubular reactor, which increases the effective reaction opportunity between the reaction liquid and the catalyst, greatly improves the catalytic efficiency of the catalyst, and reduces the amount of catalyst used; and the disturbed fluid takes away the heat generated by the catalytic reaction of the catalyst, and the temperature inside the catalyst is evenly distributed, which prevents the catalyst from failing due to excessive temperature, and effectively improves the selectivity of the catalyst. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0028] Figure 1 It is a schematic structural diagram of a catalyst carrying device provided in an embodiment of the utility model;

[0029] Figure 2 It is a top view of a connector of a catalyst carrying device provided by an embodiment of the utility model;

[0030] Figure 3 It is a structural schematic diagram of a catalyst loading device provided in an embodiment of the utility model;

[0031] Figure 4 It is a cross-sectional view inside the tube body of a tubular reactor provided by an embodiment of the utility model;

[0032] Figure 5 A partial structural diagram of a tubular reactor provided in an embodiment of the utility model;

[0033] In the figure: 1, connector; 11, connecting shaft; 12, connecting rod; 13, screw through hole; 14, groove;

[0034] 2. Carrier; 21. Metal baffle; 22. Grille; 23. Screw holes; 3. Reactor tube; 4. Catalyst carrier;

[0035] In order to show the positions of various parts, the distances or sizes between them are exaggerated and the schematic diagram is for reference only. DETAILED DESCRIPTION

[0036] It should be noted that the following detailed descriptions are all illustrative and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0037] As introduced in the background technology, the existing reactor catalyst loading device has the problems of low catalyst processing efficiency and uneven temperature distribution in the reactor. In order to solve the above technical problems, the utility model proposes a reactor catalyst loading device and a tubular reactor thereof.

[0038] like Figure 1 As shown, an embodiment of the utility model describes a catalyst carrying device, comprising: two connectors 1 arranged up and down and a plurality of carriers 2, the connector 1 is connected to the rotating device of the reactor, so that the carrying device of the utility model rotates in the reactor; the carrier 2 is a box-shaped hollow structure, and a solid granular catalyst is carried in the carrier 2;

[0039] The connector 1 includes a connecting shaft 11 and a connecting rod 12, the connecting rod 12 is arranged perpendicular to the connecting shaft 11, and one end of the connecting rod 12 is connected to the connecting shaft 11, and a plurality of connecting rods 12 are evenly arranged on the same plane, and the two connectors 1 are arranged in mirror symmetry, and the planes formed by the connecting rods 12 of the two connectors 1 are arranged oppositely; that is, the number of connecting rods 12 of the two connectors 1 is the same, and the connecting rods 12 of the two connectors 1 arranged up and down are in the same position, and the two connecting rods 12 arranged up and down and opposite to each other form a parallel structure, which is used to fix the two sides of the carrier 2 of the box-shaped structure;

[0040] The carrier 2 is a box-shaped hollow structure, including two grids 22 arranged in parallel and at intervals, and the interval between the two grids 22 is used to load the catalyst.

[0041] like Figure 2 As shown, optionally, the number of connecting rods 12 of the connector 1 is four, and the four connecting rods 12 form a cross shape, and the connector 1 is used to connect the carrier 2 with the external rotating device of the reactor.

[0042] Optionally, a regular hexagonal groove 14 is provided at the free end of the connecting shaft 11, and a protrusion corresponding to the groove 14 is provided on the rotating device of the reactor, and connected to the rotating device of the reactor. The matching structure corresponding to the groove 14 and the protrusion facilitates the disassembly of the mounting device and can match various rotating devices of the reactor. The depth of the groove 14 is adjusted according to the rotating shaft of the rotating device of the reactor, and the depth of the groove 14 is preferably 0.5-3 cm.

[0043] Optionally, the free end of the connecting shaft 11 and the rotating device of the reactor can also be connected through a coupling. The coupling is provided with a protrusion corresponding to the groove 14, and the connecting shaft 11 and the rotating device of the reactor are connected through the coupling. This is the prior art.

[0044] Optionally, the connecting rod 12 is a plate-shaped connecting rod, and a screw hole 13 is set at one end of the plate-shaped connecting rod away from the connecting shaft 11, and a screw hole 23 is set at the corresponding position of the metal baffle 21. The screw passes through the screw hole 13 and is threadedly connected to the screw hole 23 to fix the carrier 2 on the connecting rod 12 to prevent the carrier from deforming during rotation.

[0045] Optionally, the connecting shaft 11 of the connector 1 is configured to be cylindrical.

[0046] like Figure 3 As shown, optionally, the grid 22 is set as a metal grid with a mesh size of 10-40, and a certain interval is set between the two metal grids so that the carrier 2 forms a hollow structure, and the hollow hole structure carries the catalyst at intervals. The small holes on the grid 22 allow the reaction liquid to pass through the grid 22, so that the reaction liquid is fully in contact with the catalyst.

[0047] Since the carrier 2 is a container for carrying the catalyst, the front and back surfaces are composed of metal grids, so that the reaction liquid flows in the tube cavity and the carrier 2 to react with the catalyst. To ensure the fluidity of the liquid, it can be achieved by increasing the length ratio of the length, width and thickness of the carrier 2, and the ratios of length / thickness and width / thickness are both greater than 5; the size of the grid 22 mesh is adjusted according to the size of the catalyst, but if the catalyst is too small and the grid 22 mesh is large, it is difficult for the reaction liquid and the catalyst to fully contact, and the grid 22 mesh is 10-40 mesh; the catalyst is preferably a spherical catalyst with uniform particles. Optionally, the metal grid can be set to a variety of shapes as needed. Considering the process difficulty and the shape of the tubular reactor, it is set to a rectangle.

[0048] like Figure 1 and Figure 3 As shown, optionally, the plate-like connecting rods 12 of the connector 1 that are opposite to each other are covered on the carrier 2, and the other two sides of the carrier 2 are fixedly set as metal baffles 21, and the two metal baffles 21 are arranged in parallel between the two metal grilles. The two plate-like connecting rods 12, the two metal grilles and the two metal baffles 21 constitute a hollow box-shaped carrier 2.

[0049] Preferably, the metal grid and the metal baffle 21 are fixed together by welding to play a supporting and fixing role. The upper and lower sides are opened to facilitate the filling of the catalyst. A screw through hole 13 is set at the end of the plate-like connecting rod 12 away from the connecting shaft 11, and a screw hole 23 is set at the corresponding position of the metal baffle 21. The plate-like connecting rod 12 is fixed to the carrier 2 by screws to form a box-like structure.

[0050] Optionally, the connector 1 and the carrier 2 are both made of stainless steel, and the material selection is based on existing technology.

[0051] The utility model embodiment also provides a tubular reactor, including a reactor tube body 3 and the above-mentioned reactor catalyst loading device 4, the reactor catalyst loading device 4 is arranged in the tube body 3, the tube body 3 and the reactor catalyst loading device 4 are rotatably connected, and a certain gap is set between the metal baffle 21 and the inner wall of the tube cavity of the reactor, and the gap is preferably 3-5mm to prevent the reaction raw materials from flowing along the gap outside the frame without contacting the catalyst.

[0052] Here’s how to use it:

[0053] Select a layered catalyst loading device that is suitable for the size of the tubular reaction chamber, assemble the lower connector and four loading devices together with screws, fill the loading devices with granular catalysts, and evenly distribute the catalyst particles in the loading devices, and then connect the upper connector to the loading devices with screws. After assembly, the catalyst loading device can overlap naturally in the upper and lower directions; the lengths of the left and right sides and the front and back sides are consistent, and the overall combination is tight;

[0054] The device is placed into the lumen of the tubular reactor, the pipeline is sealed, and the rotating device is assembled with the connecting shaft of the connector.

[0055] The rotating device is started, and the rotating speed of the rotor is controlled, and the angular velocity is controlled between 90-720° / s, so that the reaction liquid in the catalyst catalyzes the reaction.

[0056] The present invention takes the process of synthesizing N-hydroxyethyl-pyrrolidone in a tubular reactor as an example, and makes a comparative description as follows:

[0057] The raw materials are liquid butyrolactone and liquid ethanolamine, which are pumped into the pipeline, mixed in the mixer, and flow into the reactor. The reaction temperature is about 240°C; the catalyst is spherical NaY molecular sieve. Under the same reaction process conditions, the difference in reaction yield between the ordinary tubular reactor filled with catalyst and the tubular reactor equipped with a catalyst carrying device in this embodiment is tested.

[0058] Among them, control group 1 and control group 2 use ordinary tubular reactors, adopt the method of direct catalyst filling, the catalyst is directly filled inside the tubular reactor, the catalyst filling center is the center of the pipeline, there is no special structure, the outermost two sides are filled with metal rings, which play the role of carrying the catalyst, and are not connected to the rotating device. Experimental group 1 and experimental group 2 are tubular reactors including reactor catalyst carrying devices in the embodiment of the utility model, the metal grid hole size is 20 mesh, and the angular velocity of the rotator is 100° / s. The reaction chamber size of the control group and the experimental group is the same. Based on the same reaction conditions and raw materials of the same components, after the reaction, the yield is calculated and the selectivity of the catalyst is determined.

[0059] name Catalyst loading amount (g) Selectivity (%) Reaction yield (%) Ordinary tubular reactor 500g 92.3 94.59 Ordinary tubular reactor 250g 94.6 75.33 Strong mixing catalyst loading device 200g 98.35 94.75 Strong mixing catalyst loading device 250g 98.41 98.62

[0060] It can be seen from the above experimental data that, under the condition of the same yield, the amount of catalyst used in the tubular reactor equipped with the catalyst carrying device of this embodiment is significantly less than that of the ordinary tubular reactor, and the selectivity is also higher than that of the ordinary tubular reactor. Under the condition of the same catalyst dosage, the yield and catalyst selectivity of the tubular reactor equipped with the catalyst carrying device of this embodiment are much higher than those of the ordinary tubular reactor.

[0061] The reaction liquid flows in a relatively smooth manner in the pipe of an ordinary tubular reactor. The tubular reactor of this embodiment equipped with a catalyst carrying device causes a strong fluid disturbance and obtains a strong turbulent state, which increases the effective reaction opportunities between the reaction liquid and the catalyst, greatly improves the catalytic efficiency of the catalyst, and reduces the amount of catalyst used.

[0062] During the reaction between the catalyst and the reaction liquid, a large amount of heat is released, causing overheating inside the catalyst. Some products decompose due to the high temperature, which reduces the selectivity of the catalyst. The tubular reactor equipped with a catalyst carrying device in this embodiment changes the flow state of the liquid and the number of contacts with the catalyst, so that the fluid takes away the heat generated by the catalyst reaction. The temperature distribution inside the catalyst is uniform, which can effectively improve the selectivity.

[0063] Although the above describes the specific implementation methods of the utility model in combination with the accompanying drawings, it is not intended to limit the scope of protection of the utility model. Technical personnel in the relevant field should understand that on the basis of the technical solution of the utility model, various modifications or deformations that can be made by technical personnel in this field without creative work are still within the scope of protection of the utility model.

Claims

1. A reactor catalyst loading device, characterized in that: It includes two connectors, and the two connectors are arranged in mirror symmetry; The connector includes a connecting shaft and a connecting rod, the connecting rod is arranged perpendicular to the connecting shaft, one end of the connecting rod is connected to the connecting shaft, and a plurality of connecting rods are evenly arranged on the same plane; The planes formed by the connecting rods of the two connectors are arranged opposite to each other, and the carrier is fixedly arranged between the two opposite connecting rods; The carrier is a box-shaped structure, including two grids arranged in parallel and at intervals, and the interval between the two grids is used to carry the catalyst; The connecting shaft is connected to the rotating device of the reactor.

2. The reactor catalyst loading device according to claim 1, characterized in that: The number of connecting rods of the connector is four, and the four connecting rods form a cross shape. The connecting rods are plate-shaped connecting rods.

3. The reactor catalyst loading device according to claim 1, characterized in that: The free end of the connecting shaft is connected to the rotating device of the reactor through a coupling.

4. The reactor catalyst loading device according to claim 1, characterized in that: A regular hexagonal groove is arranged at the free end of the connecting shaft and is connected to the rotating device of the reactor.

5. The reactor catalyst loading device according to claim 1, characterized in that: The grid is set as a metal grid with a mesh number of 10-40. The catalyst is carried in the interval between the two metal grids. The grid allows the catalyst to fully contact with the reaction liquid.

6. The reactor catalyst loading device according to claim 1, characterized in that: Metal grilles are set in rectangular shape.

7. The reactor catalyst loading device according to claim 2, characterized in that: The plate-shaped connecting rod covers two opposite sides of the carrier and between two metal grilles.

8. The reactor catalyst loading device according to claim 7, characterized in that: The other two sides of the carrier are fixedly arranged as metal baffles, and the two metal baffles are arranged in parallel between the two metal grids.

9. The reactor catalyst loading device according to claim 8, characterized in that: A screw hole is set at one end of the plate-shaped connecting rod away from the connecting shaft, and a screw hole is also set at a corresponding position of the metal baffle. The carrier is fixed on the connecting rod by threaded connection between the screw and the screw hole.

10. A tubular reactor, characterized in that: It comprises a tube body and a reactor catalyst loading device as claimed in any one of claims 1 to 9, wherein the reactor catalyst loading device is arranged in the tube body, and the tube body is rotatably connected to the reactor catalyst loading device.

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