Pyridine base anti-blocking reinforced mixing fixed bed reactor

Abstract

The utility model discloses a pyridine base anti-blocking reinforced mixing fixed bed reactor, which belongs to the technical field of fixed beds and comprises a reaction tube, an upper functional flange is arranged at the top of the reaction tube, a lower functional flange is arranged at the bottom of the reaction tube, and a reaction disc is arranged on the inner side of the reaction tube. According to the utility model, the problems that in the existing actual operation process, a small catalyst still falls into the sleeve to cause blockage, and in addition, a gas phase and a liquid phase are extremely easy to meet in a catalyst bed layer to cause side reaction can be solved. According to the utility model, catalyst particles can be effectively prevented from entering the feeding guide pipe, so that blockage is prevented, the structure that the reaction disc bears the catalyst can fully ensure that gas and liquid phases meet in a catalyst bed layer, side reaction is effectively avoided, blockage can be effectively prevented, gas-liquid two-phase mixing is enhanced, and side reaction is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of fixed beds, in particular to a pyridine alkali anti-clogging enhanced mixed fixed bed reactor. Background Art

[0002] In the current pyridine base fixed bed reactor, during the reaction process of gas-liquid phase in the catalyst bed, the material is mainly fed in and out by the bottom-in and top-out method. The lower feed port is a three-way structure with a built-in casing. The inner casing is connected to the liquid phase delivery pipeline, and the outer tube is the gas source interface. Under this structure, the casing needs to be covered when the catalyst is loaded, and the bottom including the casing opening needs to be wrapped with quartz wool to prevent the catalyst from falling into the casing and causing blockage.

[0003] However, in the actual operation process, tiny catalysts will still fall into the casing and cause blockage. In addition, the bottom often needs to be padded with quartz sand and then covered with catalyst, and it is necessary to ensure that the casing mouth is deep into the catalyst bed. Otherwise, it is very easy for the gas and liquid phases to not meet in the catalyst bed, resulting in the occurrence of side reactions. Utility Model Content

[0004] The purpose of the utility model is to provide a pyridine base anti-clogging enhanced mixed fixed bed reactor, which can effectively prevent catalyst particles from entering the feed conduit and thus prevent clogging. The structure of the reaction disk receiving the catalyst can fully ensure that the gas-liquid two phases meet in the catalyst bed, effectively avoiding the occurrence of side reactions, and can effectively prevent clogging and enhance the mixing of the gas-liquid two phases to reduce the occurrence of side reactions, thereby solving the problems in the prior art.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A pyridine alkali anti-clogging enhanced mixed fixed bed reactor comprises a reaction tube, wherein an upper functional flange is arranged at the top of the reaction tube, a lower functional flange is arranged at the bottom of the reaction tube, and a reaction disk is arranged inside the reaction tube;

[0007] Among them, a feed conduit, a discharge conduit and a feed plug are arranged on the upper functional flange, and the feed conduit and the discharge conduit both extend into the reaction tube;

[0008] Wherein, an air intake duct is arranged on the lower functional flange, and the air intake duct also extends into the reaction tube.

[0009] Preferably, the reaction tube is cast in one piece using 316L stainless steel, wherein the reaction disk is horizontally placed at the diameter change position of the reaction tube.

[0010] Preferably, the reaction disk is made of 316L stainless steel, wherein the reaction disk is a porous sieve-shaped circular metal mesh structure.

[0011] Preferably, the inner diameter of the upper section of the reaction tube is the same as the outer diameter of the reaction disk, and the inner diameter of the lower section of the reaction tube is the same as the inner diameter of the reaction disk.

[0012] Preferably, a thermocouple sleeve is also provided on the upper functional flange, and the thermocouple sleeve extends into the reaction tube.

[0013] Preferably, the feed conduit extends to the reaction disk, and the feed conduit is located above the reaction disk, the liquid phase is fed from above through the feed conduit, and the gas source is fed from below through the gas intake conduit.

[0014] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0015] The utility model can be disassembled and assembled only by removing the upper functional flange and the lower functional flange, and cleaning and maintenance are more convenient; the design of gas-liquid separation and transportation, and the liquid phase entering from the top, avoids blockage caused by backflow of traditional small particle catalysts; the movable reaction disk design isolates the gas and liquid phases, and allows the two to enter the bed layer to fully react without meeting each other in advance to cause side reactions, which can effectively prevent catalyst particles from entering the feed conduit and thus prevent blockage; the structure of the reaction disk that receives the catalyst can fully ensure that the gas-liquid two phases meet in the catalyst bed layer, effectively avoiding the occurrence of side reactions, and can effectively prevent blockage and strengthen the mixing of the gas-liquid two phases to reduce the occurrence of side reactions. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is an overall cross-sectional view of the utility model pyridine base anti-clogging enhanced mixed fixed bed reactor;

[0017] Figure 2 It is a structural schematic diagram of the upper functional flange of the utility model;

[0018] Figure 3 It is a structural schematic diagram of the lower functional flange of the utility model;

[0019] Figure 4 For this utility model Figure 1 AA section view.

[0020] In the figure: 1. feed conduit; 2. upper functional flange; 3. reaction tube; 4. reaction plate; 5. discharge conduit; 6. lower functional flange; 7. air inlet conduit; 8. feed plug; 9. thermocouple sleeve. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] In order to solve the existing technical problem that in actual operation, small catalysts still fall into the casing and cause blockage. In addition, the bottom often needs to be padded with quartz sand and then covered with catalyst, and the casing mouth needs to be ensured to be deep into the catalyst bed. Otherwise, it is very easy to cause the gas-liquid two phases not to meet in the catalyst bed, resulting in the occurrence of side reactions. Please refer to Figure 1-Figure 4 , this embodiment provides the following technical solutions:

[0023] A pyridine-alkali anti-clogging enhanced mixed fixed bed reactor comprises a reaction tube 3, and an upper functional flange 2 is arranged on the top of the reaction tube 3.

[0024] The upper functional flange 2 is provided with a feed conduit 1, a discharge conduit 5 and a feed plug 8, and the feed conduit 1 and the discharge conduit 5 both extend into the reaction tube 3;

[0025] It should be noted that the feed plug 8 is an external interface.

[0026] The catalyst loading step is as follows: unscrew the feed plug 8 and add the required catalyst particles therein, and the catalyst loading is completed.

[0027] In this embodiment, a thermocouple sleeve 9 is further provided on the upper functional flange 2 , and the thermocouple sleeve 9 extends into the reaction tube 3 .

[0028] It should be noted that the feed conduit 1, the discharge conduit 5 and the air intake conduit 7 are all made of 316L stainless steel.

[0029] It should be noted that the thermocouple sleeve 9 and the upper functional flange 2 are an integrated structure, wherein the thermocouple sleeve 9 extends into the reaction tube 3 for use by the thermocouple to measure the temperature.

[0030] A lower functional flange 6 is provided at the bottom of the reaction tube 3 .

[0031] The lower functional flange 6 is provided with an air intake duct 7 , which also extends into the reaction tube 3 .

[0032] In this embodiment, the feed conduit 1 extends to the reaction disk 4 and is located above the reaction disk 4 . The liquid phase is fed from above through the feed conduit 1 , and the gas source is fed from below through the gas intake conduit 7 .

[0033] It should be noted that the liquid feed is separated from the gas feed, and the liquid feed enters from above, which has a simpler structure and can effectively solve the problem of small particles of the traditional fixed bed catalyst flowing back into the conduit, effectively preventing blockage.

[0034] It should be noted that after the feed conduit 1 is buried in the catalyst bed, during actual operation, the liquid phase is vaporized at high temperature and meets the gas source below in the catalyst to fully react, thus avoiding premature encounter and causing side reactions.

[0035] A reaction disk 4 is arranged inside the reaction tube 3;

[0036] In this embodiment, the reaction tube 3 is cast in one piece using 316L stainless steel, wherein the reaction disk 4 is horizontally placed at the diameter change portion of the reaction tube 3, the so-called diameter change portion means that the reaction tube 3 has two parts, the outer diameter of the upper part is greater than the outer diameter of the lower part, the inner diameter of the upper part is equal to the outer diameter of the lower part, and the reaction disk 4 is arranged at the connection between the upper and lower parts, that is, the reaction disk 4 is arranged at the top of the lower part.

[0037] It should be noted that the reaction tube 3 is made of 316L material, which is resistant to high temperature and corrosion. The inner diameter of the upper tube body of the reaction tube 3 is slightly larger than that of the lower tube body. The purpose is to place the movable reaction disk 4 and facilitate the cleaning or replacement of the reaction disk 4 at a later time.

[0038] It should be noted that the catalyst is received by the reaction disk 4 .

[0039] In this embodiment, the reaction disk 4 is made of 316L stainless steel, wherein the reaction disk 4 is a porous sieve-shaped circular metal mesh structure.

[0040] It should be noted that the reaction disk 4 is a porous sieve structure, which can receive most of the small catalyst particles and prevent the catalyst particles from falling when air flows through.

[0041] The mesh size of the reaction disk 4 can be selected according to the actual particle size of the catalyst.

[0042] In this embodiment, the inner diameter of the upper section of the reaction tube 3 is the same as the outer diameter of the reaction disk 4 , and the inner diameter of the lower section of the reaction tube 3 is the same as the inner diameter of the reaction disk 4 .

[0043] The installation steps of the fixed bed reactor are as follows: first, tighten the bolts of the upper functional flange 2, then unscrew the feeding plug 8, add the required catalyst particles therein, complete the catalyst loading, and check whether the catalyst has leakage through the lower port of the reaction tube 3, then tighten the bolts of the lower functional flange 6, and finally complete the docking of the feed, air inlet and discharge ports; during the reaction, heat the outer wall of the reaction tube 3, first open the air source, and then start the liquid phase feed. When the liquid phase enters the pipeline of the reaction tube 3, the high temperature causes it to be instantly vaporized, and under the impetus of the lower air source, the two steams meet and mix in the catalyst bed, and continuously climb upward to fully contact and react with the catalyst, and then leave from the upper discharge conduit 5 to enter the subsequent condensation section.

[0044] Structurally, it is simpler, and only the upper functional flange 2 and the lower functional flange 6 need to be removed to complete the disassembly and assembly, making cleaning and maintenance more convenient; the gas-liquid separation and transportation, and the design of the liquid phase entering from the top, avoids blockage caused by the backflow of traditional small-particle catalysts; the movable reaction disk 4 is designed to isolate the gas and liquid phases, and allow the two to enter the bed layer for full reaction without meeting in advance to cause side reactions, which can effectively prevent catalyst particles from entering the feed conduit 1 and thus prevent blockage. The structure of the reaction disk 4 that receives the catalyst can fully ensure that the gas and liquid phases meet in the catalyst bed, effectively avoiding the occurrence of side reactions, and can effectively prevent blockage and strengthen the mixing of the gas and liquid phases to reduce the occurrence of side reactions.

[0045] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0046] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A pyridine base anti-clogging enhanced mixed fixed bed reactor, comprising a reaction tube (3), characterized in that: An upper functional flange (2) is arranged at the top of the reaction tube (3), a lower functional flange (6) is arranged at the bottom of the reaction tube (3), a reaction plate (4) is arranged on the inner side of the reaction tube (3), a feed conduit (1), a discharge conduit (5) and a feed plug (8) are arranged on the upper functional flange (2), the feed conduit (1) and the discharge conduit (5) both extend into the reaction tube (3), and an air intake conduit (7) is arranged on the lower functional flange (6), the air intake conduit (7) also extends into the reaction tube (3).

2. The pyridine base anti-clogging enhanced mixed fixed bed reactor according to claim 1, characterized in that: The reaction disk (4) is horizontally placed at the diameter change position of the reaction tube (3).

3. The pyridine base anti-clogging enhanced mixed fixed bed reactor according to claim 2, characterized in that: The reaction disk (4) is in the form of a porous sieve-shaped circular metal mesh structure.

4. The pyridine base anti-clogging enhanced mixed fixed bed reactor according to claim 1, characterized in that: The inner diameter of the upper section of the reaction tube (3) is the same as the outer diameter of the reaction disk (4), and the inner diameter of the lower section of the reaction tube (3) is the same as the inner diameter of the reaction disk (4).

5. The pyridine base anti-clogging enhanced mixed fixed bed reactor according to claim 1, characterized in that: A thermocouple sleeve (9) is also provided on the upper functional flange (2), and the thermocouple sleeve (9) extends into the reaction tube (3).

6. The pyridine base anti-clogging enhanced mixed fixed bed reactor according to claim 1, characterized in that: The feed conduit (1) extends to the reaction disk (4), and the feed conduit (1) is located above the reaction disk (4). The liquid phase is fed from above through the feed conduit (1), and the gas source is fed from below through the gas intake conduit (7).

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