Preparation equipment of molecular sieve catalyst for caprolactam production

Abstract

The utility model discloses molecular sieve catalyst preparation equipment for caprolactam production, and relates to the technical field of catalyst preparation. Through the arrangement of a cleaning net barrel and a flow guide assembly, in the flowing process of cleaning liquid, the flow guide assembly guides the flowing cleaning liquid, so that the cleaning liquid is more uniform; the cleaning liquid forms an eddy current rotating around the axis of the net washing barrel, so that the molecular sieve catalyst semi-finished product in the net washing barrel is washed, and the molecular sieve catalyst semi-finished product can be driven by the eddy current to do circular motion in the net washing barrel, so that the molecular sieve catalyst semi-finished product can be impacted in multiple directions; the molecular sieve catalyst semi-finished products roll and rotate, accumulation of the molecular sieve catalyst semi-finished products is avoided, the cleaning effect is better, interference caused by external force is avoided, the impact effect of cleaning liquid on the molecular sieve catalyst semi-finished products is guaranteed, and the cleaning efficiency is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of catalyst preparation technology, especially to a molecular sieve catalyst preparation equipment for caprolactam production. BACKGROUND

[0002] Caprolactam is an important intermediate in the industrial production of nylon, and the Beckmann rearrangement of cyclohexanone oxime is one of the key steps in the production process of caprolactam. Currently, the traditional liquid-phase rearrangement process using concentrated sulfuric acid as a catalyst is mainly used in industry. Although this process has relatively mild reaction conditions and ideal conversion rate and selectivity, it produces a large amount of ammonium sulfate and easily causes equipment corrosion and environmental pollution. In order to overcome the above shortcomings, the gas-phase Beckmann rearrangement process using solid acid catalysts such as molecular sieves has attracted attention in recent years. However, the gas-phase Beckmann rearrangement process requires a relatively high reaction temperature, the stability of the catalyst is poor, the catalyst deactivates quickly, and the selectivity of the catalyst is also relatively low. Although the current modified molecular sieves can improve the catalytic activity in a short time, their service life is relatively low.

[0003] To solve the above problems, the patent document with publication number "CN114522715B" discloses a preparation method of modified molecular sieves and a catalyst for preparing caprolactam by catalyzing cyclohexanone oxime. The preparation method includes: step S1, reacting the terminal silicon hydroxyl groups of a silicon molecular sieve with an ethylene amine organic base to obtain a product system; step S2, performing solid-liquid separation on the product system to obtain wet solid and separation liquid; and step S3, washing, drying, and calcining the wet solid to obtain a modified molecular sieve. The modified molecular sieve prepared by the preparation method of the present application can be applied in the production of caprolactam, and can be used as a catalyst to catalyze the Beckmann rearrangement reaction of cyclohexanone oxime, which can ensure high conversion rate of cyclohexanone oxime and high selectivity of caprolactam, prolong the service life of the catalyst, and ensure good long-term running stability of the process.

[0004] In the prior art, water washing is an important step in the preparation of molecular sieve catalysts, which involves removing various chemicals used in the preparation process of the catalyst to ensure the purity and performance of the catalyst. The purpose of water washing is to remove impurities on the surface and in the pores of the catalyst, which may be various chemical reagents added during the preparation of the catalyst, unreacted raw materials, or by-products produced during the shaping, drying, and calcination of the catalyst. Through water washing, the selectivity and activity of the catalyst can be effectively improved, and the service life of the catalyst can also be prolonged.

[0005] Specific to the operation of water washing, the catalyst is washed multiple times using deionized water or purified water until the washing liquid becomes clear, indicating that most of the impurities have been removed. The frequency and duration of water washing depend on the composition and preparation method of the catalyst, as well as the nature of the raw materials and chemical reagents used.

[0006] In existing water washing devices, in order to ensure washing effect, one-way water flow is generally used to flush the semi-finished product, which is easy to cause local accumulation of semi-finished product particles without external interference. However, if external interference is used, the impact effect of the semi-finished product will be poor, thereby reducing the washing effect and requiring an extension of the water washing time, which reduces the water washing efficiency. Therefore, a molecular sieve catalyst preparation device for caprolactam production is needed. Practical new type content

[0007] The present application aims to provide a molecular sieve catalyst preparation device for caprolactam production to solve the problems raised in the background art.

[0008] To achieve the above-mentioned purpose, the present application provides the following technical solution: a molecular sieve catalyst preparation device for caprolactam production, comprising a cleaning tank provided with a water inlet pipe and a water outlet pipe at two ends, a cleaning net barrel fixed inside the cleaning tank, the cleaning net barrel being provided with a plurality of cleaning net barrels arranged transversely in the cleaning tank from left to right, the cleaning net barrel being horizontally arranged and the axial direction being perpendicular to the length extension direction of the cleaning tank;

[0009] One side of the cleaning tank is provided with a filling port, and a plugging plug is arranged in the filling port to close the filling port, and the filling port is in open communication with one end of the cleaning net barrel;

[0010] A flow guide assembly is installed in the cleaning tank, and the flow guide assembly is used to guide the water flow flowing from the water inlet to the water outlet to be a local annular flow, the annular water flow guided by the flow guide assembly rotates and flows along the axis of the cleaning net barrel, and the rotation direction of the water flow is the same as the flow direction of the water flow in the cleaning tank.

[0011] Preferably, the flow guide assembly comprises a plurality of flow guide plates, the plurality of flow guide plates are adjustably clamped between the front and rear two side walls of the cleaning tank through clamping pieces, the flow guide plates are arc-shaped plate structures, the plurality of flow guide plates are annularly distributed around the cleaning net barrel, and the plurality of flow guide plates are scattered in a cyclone shape.

[0012] Preferably, the spacing between the flow guide plate and the cleaning net barrel is gradually changed, the spacing between the water inlet end of the flow guide plate and the outer side wall of the cleaning net barrel is greater than the spacing between the water outlet end of the flow guide plate and the outer side wall of the cleaning net barrel.

[0013] Preferably, an inclined material guide inclined plate is fixed inside the cleaning net barrel, the material guide inclined plate is provided with a plurality of material guide inclined plates and is distributed along the inner circumference of the cleaning net barrel, and the inclination directions of the plurality of material guide inclined plates are the same as the rotation direction of the water flow.

[0014] Preferably, the two ends of the flow guide plate are provided with mounting holes, and the mounting holes are provided with a plurality of corners respectively located on the inner side of the mounting hole and the cleaning tank;

[0015] The clamping piece comprises a stop post and a compression spring, the stop post is slidingly inserted into the mounting hole, and the compression spring is fixed at one end of the stop post and the inner side wall of the mounting hole.

[0016] Preferably, the end of the stop post away from the compression spring is fixed with a connecting head, the connecting head is located on the outer side of the mounting hole, and the connecting head has a rough surface.

[0017] In summary, the technical effects and advantages of the utility model are as follows:

[0018] 1. In the utility model, through the setting of the cleaning net barrel and the flow guide assembly, the flow guide assembly guides the flowing cleaning liquid during the flowing process of the cleaning liquid, so that the cleaning liquid forms a vortex rotating around the axis of the cleaning net barrel, thereby washing the molecular sieve catalyst semi-finished product in the cleaning net barrel, and the molecular sieve catalyst semi-finished product is driven to move in a circle under the vortex, so that the molecular sieve catalyst semi-finished product is impacted from multiple directions, and the molecular sieve catalyst semi-finished product rolls and rotates, thereby avoiding the accumulation of the molecular sieve catalyst semi-finished product, so that the cleaning effect is better, and the use of external force for interference is also avoided, the impact effect of the cleaning liquid on the molecular sieve catalyst semi-finished product is ensured, and the cleaning efficiency is ensured.

[0019] 2. In the utility model, through the variable-pitch distribution, after the cleaning liquid is guided by the flow guide plate, not only a vortex is formed, but also the cross-sectional size through which the water flow can pass is reduced to a certain extent, so that the flowing speed of the water flow is accelerated, a stronger impact effect is brought, and the cleaning effect of the molecular sieve catalyst semi-finished product when the molecular sieve catalyst preparation equipment for caprolactam production is used is further enhanced, and the actual use effect is better.

[0020] 3. In the utility model, through the setting of the guide inclined plate, the molecular sieve catalyst semi-finished product moving with the water flow can be guided, so that the molecular sieve catalyst semi-finished product is prevented from being attached to the inner side of the cleaning net barrel, and the molecular sieve catalyst semi-finished product is ensured to be mostly in a state of separation from the cleaning net barrel when being washed, so that the possibility of accumulation of the molecular sieve catalyst semi-finished product is further avoided, and the molecular sieve catalyst semi-finished product is more convenient to wash comprehensively. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description only constitute some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0022] Fig. 1 It is a schematic view of the three-dimensional structure in the embodiment;

[0023] Fig. 2 It is a partial sectional view in the embodiment;

[0024] Fig. 3 It is an enlarged view of the partial sectional view of the deflector in the embodiment.

[0025] In the figure: 1, cleaning tank; 2, cleaning net barrel; 21, material guiding inclined plate; 3, deflector; 31, mounting hole; 4, abutting column; 5, compression spring; 6, connecting head; 7, plugging plug. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be described clearly and completely in the following with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments only constitute some embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without any creative effort belong to the scope of protection of the present application.

[0027] Embodiment: refer to Figs. 1-3 The molecular sieve catalyst preparation equipment for caprolactam production shown in the figure, including the cleaning tank 1 which is provided with water inlet pipe and water outlet pipe at both ends, the cleaning net barrel 2 is fixed inside the cleaning tank 1, the cleaning net barrel 2 is provided with a plurality of and arranged transversely in the cleaning tank 1 from left to right, the cleaning net barrel 2 is horizontally arranged and the axial direction is perpendicular to the length extension direction of the cleaning tank 1;

[0028] One side of the cleaning tank 1 is provided with a filling port, the filling port is provided with a plugging plug 7 which closes the filling port, and the filling port is in open communication with one end of the cleaning net barrel 2.

[0029] The deflector assembly is installed in the cleaning tank 1, the deflector assembly is used for guiding the water flow flowing from the water inlet to the water outlet to be a local annular flow, the annular water flow guided by the deflector assembly rotates and flows along the axis of the cleaning net barrel 2, and the rotation direction of the water flow is the same as the flowing direction of the water flow in the cleaning tank 1.

[0030] Based on the above structure, in use, the user first adds the molecular sieve catalyst semi-finished product to be washed into the cleaning net barrel 2 through the filler port, then closes the filler port with the sealing plug 7, then inputs the cleaning liquid for washing the molecular sieve catalyst semi-finished product into the cleaning tank 1 through the water inlet pipe, and finally discharges the cleaning liquid from the water outlet pipe;

[0031] During the flow of the cleaning liquid, the flow guide assembly guides the flowing cleaning liquid, so that the cleaning liquid forms a vortex rotating around the axis of the washing net barrel 2, thereby washing the molecular sieve catalyst semi-finished product in the washing net barrel 2, and enabling the molecular sieve catalyst semi-finished product to make circular motion under the action of the vortex, so that the molecular sieve catalyst semi-finished product is impacted from multiple directions, and the molecular sieve catalyst semi-finished product rolls and rotates, thereby avoiding the accumulation of the molecular sieve catalyst semi-finished product, so that the cleaning effect is better, and at the same time, external force is avoided, thereby ensuring the impact effect of the cleaning liquid on the molecular sieve catalyst semi-finished product, and ensuring the cleaning efficiency.

[0032] Further, the flow guide assembly includes a plurality of flow guide plates 3, which are adjustably clamped between the front and rear sidewalls of the cleaning tank 1 by clamping members. The flow guide plates 3 are arc-shaped plate structures, and the plurality of flow guide plates 3 are distributed in a ring shape around the washing net barrel 2, and are scattered in a rotational flow shape. The flowing cleaning liquid forms a vortex after being guided by the plurality of flow guide plates 3, thereby comprehensively impacting and washing the molecular sieve catalyst semi-finished product, and enabling the molecular sieve catalyst semi-finished product to move, thereby avoiding accumulation.

[0033] Further, the distance between the flow guide plates 3 and the washing net barrel 2 is gradually changed, and the distance between the water inlet end of the flow guide plates 3 and the outer sidewall of the washing net barrel 2 is greater than the distance between the water outlet end of the flow guide plates 3 and the outer sidewall of the washing net barrel 2.

[0034] Through the variable-distance distribution, the cleaning liquid not only forms a vortex after being guided by the flow guide plates 3, but also reduces the cross-sectional size through which the water flow can pass to some extent, thereby increasing the flow speed of the water flow, bringing a stronger impact effect, and thereby further enhancing the cleaning effect of the molecular sieve catalyst semi-finished product when using the molecular sieve catalyst preparation device for caprolactam production, and the actual use effect is better.

[0035] Further, an inclined material guide inclined plate 21 is fixed inside the washing net barrel 2, the material guide inclined plate 21 is provided with a plurality of inclined plates and is distributed along the circumference of the washing net barrel 2, and the inclined directions of the plurality of material guide inclined plates 21 are the same as the rotation direction of the water flow.

[0036] The setting of the guide chute 21 can guide the molecular sieve catalyst semi-finished product moving with the water flow, so that the molecular sieve catalyst semi-finished product is prevented from being attached to the inner side of the cleaning net barrel 2, and the molecular sieve catalyst semi-finished product is mostly in a state of being separated from the cleaning net barrel 2 when being flushed, so that the possibility of the molecular sieve catalyst semi-finished product being accumulated is further avoided, and the molecular sieve catalyst semi-finished product is more convenient to be comprehensively flushed.

[0037] Further, the two ends of the guide plate 3 are provided with mounting holes 31, and the mounting holes 31 are provided with a plurality of mounting holes 31 and are located on the four corners of the inner side of the cleaning tank 1.

[0038] The clamping piece comprises a stop post 4 and a compression spring 5, the stop post 4 is slidingly inserted into the mounting hole 31, and the compression spring 5 is fixed at one end of the stop post 4 and the inner side wall of the mounting hole 31.

[0039] The end of the stop post 4 away from the compression spring 5 is fixed with a connecting head 6, the connecting head 6 is located outside the mounting hole 31, and the connecting head 6 has a rough surface.

[0040] Through the setting of the stop post 4 and the compression spring 5, the connecting head 6 at the end of the stop post 4 is tightly abutted on the inner side wall of the cleaning tank 1 under the elastic force of the compression spring 5, so that the guide plate 3 is clamped and installed in the cleaning tank 1, which is convenient for installation and also convenient for adjusting the installation position and angle of the guide plate 3, so that the guide plate 3 can change the guiding effect of the flushing liquid to form a vortex suitable for flushing, which is more flexible and convenient in actual use and is convenient for meeting different washing needs.

[0041] Meanwhile, the rough surface of the connecting head 6 can improve the stability of the connection, prevent the guide plate 3 from being deviated when being impacted by the water flow, and ensure the guiding effect of the guide plate 3 on the cleaning liquid.

[0042] The working principle of the utility model is: in the daily use process, the user first adds the molecular sieve catalyst semi-finished product to be washed into the cleaning net barrel 2 through the filling port, and then closes the filling port by using the plugging plug 7; then the cleaning liquid for flushing the molecular sieve catalyst semi-finished product is input into the cleaning tank 1 through the water inlet pipe, and the cleaning liquid is finally discharged from the water outlet pipe.

[0043] During the flowing of the cleaning liquid, the several guide plates 3 guide the flowing cleaning liquid, so that the cleaning liquid forms vortex rotating around the axis of the washing net barrel 2, thereby washing the molecular sieve catalyst semi-finished product in the washing net barrel 2, and enabling the molecular sieve catalyst semi-finished product to make circular motion in the vortex, enabling the molecular sieve catalyst semi-finished product to be impacted from multiple directions, and enabling the molecular sieve catalyst semi-finished product to roll and rotate, thereby avoiding the molecular sieve catalyst semi-finished product from forming accumulation, so that the cleaning effect is better, and meanwhile, external force is avoided from being interfered, thereby ensuring the impact effect of the molecular sieve catalyst semi-finished product by the cleaning liquid, and thereby ensuring the cleaning efficiency.

[0044] Finally, it should be noted that: the above only for the preferred embodiments of the present application, and not for limiting the present application, although the foregoing detailed description of the present application is made with reference to the foregoing embodiments, for those skilled in the art, it still can be modified, or part of the technical features of the equivalent replacement, within the spirit and principles of the present application, any modification, equivalent replacement, improvement, etc., should be included in the scope of protection of the present application.

Claims

1. A molecular sieve catalyst preparation apparatus for caprolactam production, comprising a cleaning tank (1) provided with a water inlet pipe and a water outlet pipe at both ends, characterized in that: The cleaning tank (1) is fixed with cleaning net barrels (2) inside, the cleaning net barrels (2) are arranged in multiple and from left to right transversely in the cleaning tank (1), the cleaning net barrels (2) are horizontally arranged and the axial direction is perpendicular to the length extension direction of the cleaning tank (1); One side of the cleaning tank (1) is provided with a filler port, a plugging plug (7) is inserted in the filler port to close the filler port, and the filler port is in open communication with one end of the cleaning net barrel (2); A flow guide assembly is installed in the cleaning tank (1), the flow guide assembly is used for guiding the water flow flowing from the water inlet to the water outlet to be a local annular flow, the annular water flow guided by the flow guide assembly rotates and flows along the axis of the cleaning net barrel (2), and the rotation direction of the water flow is the same as the flowing direction of the water flow in the cleaning tank (1).

2. The apparatus for preparing a molecular sieve catalyst for producing caprolactam according to claim 1, characterized by: The flow guide assembly includes a plurality of flow guide plates (3), the plurality of flow guide plates (3) are adjustably clamped between the front and rear sidewalls of the cleaning tank (1) through clamping pieces, the flow guide plates (3) are arc-shaped plate structures, the plurality of flow guide plates (3) are annularly distributed on the circumferential side of the cleaning net barrel (2), and the plurality of flow guide plates (3) are scattered in a cyclone shape.

3. The apparatus according to claim 2, wherein: the apparatus further comprises a first filter and a second filter. The spacing between the flow guide plates (3) and the cleaning net barrel (2) is gradually changed, the spacing between the water inlet end of the flow guide plates (3) and the outer sidewall of the cleaning net barrel (2) is greater than the spacing between the water outlet end of the flow guide plates (3) and the outer sidewall of the cleaning net barrel (2).

4. The apparatus according to claim 1, wherein the apparatus is characterized by: The cleaning net barrel (2) is fixed with inclined material guide inclined plates (21) inside, the material guide inclined plates (21) are arranged in multiple and distributed along the inner circumference of the cleaning net barrel (2), and the inclination directions of the multiple material guide inclined plates (21) are the same as the rotation direction of the water flow.

5. The apparatus according to claim 2, wherein: the apparatus further comprises a first filter and a second filter. Both ends of the flow guide plate (3) are provided with mounting holes (31), the mounting holes (31) are provided in multiple and located on the four corners of the mounting hole (31) and the inner side of the cleaning tank (1); The clamping piece includes a stop column (4) and a compression spring (5), the stop column (4) is slidingly inserted into the mounting hole (31), and the compression spring (5) is fixed at one end of the stop column (4) and the inner sidewall of the mounting hole (31).

6. The apparatus according to claim 5, wherein the apparatus comprises: a first reactor for preparing a catalyst precursor; a second reactor for preparing a catalyst; and a third reactor for preparing a catalyst. The end of the stop column (4) away from the compression spring (5) is fixed with a connecting head (6), the connecting head (6) is located outside the mounting hole (31), and the connecting head (6) has a rough surface.

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