Reaction device for post-treatment of formed molecular sieve

Abstract

The utility model relates to the technical field of molecular sieve treatment equipment, in particular to a reaction device for post-treatment of a formed molecular sieve, which comprises a feeding part and a discharging part, the upper parts of the feeding part and the discharging part are respectively provided with a liquid circulating port, a solid feeding port and a sampling port, and the bottoms of the feeding part and the discharging part are communicated through a switching part; the lower part of the transfer part is provided with the unloading device, the feeding part and the discharging part are arranged in parallel, and the bottoms of the feeding part and the discharging part are communicated through the transfer part to form a whole, so that compared with the existing vertical reaction device, the height of the whole equipment can be greatly reduced under the condition of ensuring the same length, and the equipment transfer and subsequent installation and maintenance operation are facilitated; the device is simple in structure and convenient to operate, materials of the formed molecular sieve can be added at the two ends simultaneously, the feeding efficiency is improved, the discharging device is located at the bottom of the whole device, the discharging efficiency can be obviously improved, excessive manual participation is not needed, and safety accidents such as scalding are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of molecular sieve processing equipment, in particular to a reaction device for post-processing of formed molecular sieves. Background Art

[0002] Molecular sieve is a kind of aluminosilicate compound with uniform microporous structure. Its pore size is similar to the general molecular size, and it can screen different fluids. The different pore sizes and structures of molecular sieves can realize shape-selective adsorption separation and shape-selective catalytic processes. Commonly used molecular sieves include A-type, X-type and Y-type. A-type molecular sieves are divided into 3A (0.3nm), 4A (0.4nm) and 5A (0.5nm) molecular sieves according to the pore size. They are widely used in dehydration, air separation, PSA to H2, PSA to CO, natural gas desulfurization and H2S, oil dewaxing, sewage treatment, detergent additives, papermaking fillers, PVC stabilizers, antibacterial agents, etc. X-type molecular sieves (pore size 0.9nm) are used for air separation, dehydration, CO2 adsorption, PSA hydrogen production, olefin purification, natural gas desulfurization and H2S, oil desulfurization, xylene separation, etc., with high adsorption capacity. The structure of Y-type molecular sieve is exactly the same as that of X-type molecular sieve, but its silicon-aluminum ratio is higher than that of X-type molecular sieve. It is mainly used in the petrochemical field by utilizing its selectivity and acidic function, including catalytic cracking, catalytic cracking, hydrocracking, alkane isomerization, toluene disproportionation, etc.

[0003] Hydrothermal synthesis is the main method for synthesizing molecular sieves. Raw materials containing silicon, aluminum and sodium are put into a reactor and reacted at a certain temperature for a certain period of time to obtain Na-type molecular sieves, such as NaA, NaX and NaY. Na-type molecular sieves themselves have no acidity and activity, and have poor stability. Their scope of use is limited and they need to be modified by ion exchange. By using other cations, such as NH4 + , Li + , K + , Ca 2+ , Ba 2+ Mg 2+ Etc., replace sodium ions, change the pore size of the molecular sieve, adjust the electric field strength and acidic centers in the molecular sieve pores, and also improve the stability of its structure.

[0004] Artificially synthesized molecular sieves are powders and cannot be used directly in industry. In order to maintain the stability of the process and reduce the difficulty of the product separation process, the molecular sieve needs to be made into particles for use. For molecular sieves with a long service life, such as air separation oxygen production, oil dewaxing, aromatics adsorption separation, etc., high strength and adsorption capacity are required. At this time, the technical route of first forming and then ion exchange becomes the best choice. This technology is called formed molecular sieve post-processing technology.

[0005] The commonly used reaction device for post-treatment of formed molecular sieves is equipped with a liquid distributor at the bottom inlet of the reaction device, a formed molecular sieve feed port at the top of the reaction device, and a discharge port at the bottom side. After the solution containing exchange ions is heated, it enters the reaction device from the bottom and then leaves from the top. After a certain period of exchange, the solution stops entering, and the residual solution in the reaction device is washed away with water instead of the solution in the same way. After washing, the material is discharged to obtain a formed molecular sieve product.

[0006] At present, the vertical reaction device for post-treatment of molded molecular sieves has the following disadvantages: ① The liquid distributor at the inlet of the solution is easy to be blocked. Especially when the particles of the molded molecular sieve are small (less than 0.5mm in diameter), the opening of the bottom distributor is small and it is easy to be blocked by particles. If the opening is large, the particles of the molded molecular sieve can easily enter the pipeline. ② The discharge requires manual unloading, which is difficult to achieve automated operation. The unloading process requires manual opening of the discharge port. Since the temperature in the reaction device is high at this time, there are safety hazards, and finally the material needs to be manually unloaded. ③ The height-to-diameter ratio of the reaction device is large, and the spatial layout is difficult. The exchange reaction takes a certain amount of time. If the time is short, the solution will flow out of the device before it reacts, which will greatly reduce the effective utilization rate of the solution. However, an excessively large height-to-diameter ratio will increase the unevenness between the upper and lower parts of the reaction device. According to experience, the height-to-diameter ratio is generally controlled between 4 and 6. For example, a reaction device with a diameter of 1 meter needs to be at least 4 meters in height. Together with the inlet and outlet pipelines, feeding and discharging operation space, the vertical space needs to be about 9 meters, which makes the spatial layout difficult. ④ A grid plate needs to be set, but the grid plate is easy to be blocked. Especially when the molecular sieve solid particles are small, the grid plate openings are very small and are easily blocked by dust after a period of use. Utility Model Content

[0007] In order to solve the problem that the above-mentioned molecular sieve post-treatment vertical reaction device occupies a large area and is relatively high, the embodiment of the utility model provides a reaction device for post-treatment of formed molecular sieves which has a small volume but good cleaning effect and is convenient for feeding and discharging.

[0008] In order to achieve the above-mentioned purpose, the embodiment of the utility model specifically adopts the following technical scheme: a reaction device for post-treatment of formed molecular sieves, including a feed part and a discharge part, the upper parts of the feed part and the discharge part are both provided with a liquid flow port, a solid addition port and a sampling port, the bottoms of the feed part and the discharge part are connected through a transition part, and the lower part of the transition part is provided with a unloading device.

[0009] As a further improvement of the above technical solution:

[0010] The feeding part, the discharging part and the transfer part are integrally formed.

[0011] The feeding part, the discharging part and the transfer part are distributed in a U shape or a V shape.

[0012] The unloading device comprises a sealing plate, a liquid discharge pipe is arranged in the middle of the sealing plate, and an adapter frame for mounting the sealing plate is arranged on the side wall of the adapter portion.

[0013] A filter screen is arranged at one end of the drain pipe connected to the sealing plate, a conveying pipeline is arranged at the other end, and a sealing valve is arranged in the middle of the drain pipe.

[0014] The upper surface of the sealing plate is arc-shaped.

[0015] One end of the sealing plate is hinged to the adapter frame, and the other end is connected to the adapter frame via a buckle. Both sides of the sealing plate are connected to the adapter frame via a limiting connecting rod.

[0016] The limiting connecting rod comprises a cantilever 1 and a cantilever 2 which are respectively hinged on the transfer frame and the sealing plate, and a hinge point is arranged at the connection between the cantilever 1 and the cantilever 2.

[0017] The beneficial effects of the utility model are as follows: the reaction device for post-treatment of formed molecular sieves comprises a feed part and a discharge part, the upper parts of the feed part and the discharge part are both provided with a liquid flow port, a solid addition port and a sampling port, the bottoms of the feed part and the discharge part are connected through a transfer part, a discharge device is provided at the lower part of the transfer part, the feed part and the discharge part are placed parallel to each other, and form a whole after being connected at the bottom through the transfer part, compared with the existing upright reaction device, the height of the entire device can be greatly reduced while ensuring the same length, which facilitates the transportation of the device and subsequent installation and maintenance operations;

[0018] Through the U-shaped and V-shaped designs, the materials of the formed molecular sieve can be added at both ends at the same time, thereby improving the feeding efficiency. The unloading device is located at the bottom of the entire device. During unloading, the formed molecular sieve will fall from the bottom of the reaction device under the action of gravity. Compared with the existing method of opening a discharge port on one side of the equipment and unloading manually, the unloading efficiency can be significantly improved without excessive human involvement, thereby reducing the occurrence of safety accidents such as scalding. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0020] Figure 2 It is a cross-sectional view of the utility model;

[0021] Figure 3 This is a structural schematic diagram of the utility model in which the sealing plate is in an open state;

[0022] Figure 4 for Figure 3 Enlarged structural diagram at A in the middle.

[0023] In the figure: 1. feed part; 2. discharge part; 3. liquid flow port; 4. solid addition port; 5. sampling port; 6. adapter part; 7. sealing plate; 8. drain pipe; 9. adapter frame; 10. filter screen; 11. conveying pipeline; 12. sealing valve; 13. buckle; 14. limit connecting rod; 15. cantilever 1; 16. cantilever 2. DETAILED DESCRIPTION

[0024] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0025] like Figure 1-4 As shown, the reaction device for post-treatment of formed molecular sieves in this embodiment includes a feed part 1 and a discharge part 2, and the upper parts of the feed part 1 and the discharge part 2 are provided with a liquid flow port 3, a solid addition port 4 and a sampling port 5. The bottoms of the feed part 1 and the discharge part 2 are connected through a connecting part 6, and a discharge device is provided at the lower part of the connecting part 6. The feed part 1 and the discharge part 2 are placed parallel to each other and form a whole after being connected at the bottom through the connecting part 6. Compared with the existing upright reaction device, the height of the entire device can be greatly reduced while ensuring the same length, which facilitates the transportation of the equipment and subsequent installation and maintenance operations. At the same time, through the U-shaped and V-shaped designs, the material addition of the formed molecular sieve can be carried out at both ends at the same time, thereby improving the feeding efficiency. The discharge device is located at the bottom of the entire device, and gravity can be used to make the formed molecular sieve fall from the reaction device during unloading. Compared with the existing method of opening a discharge port on one side of the equipment and using manual unloading, the unloading efficiency can be significantly improved, and there is no need for excessive human participation, thereby reducing the occurrence of safety accidents such as scalding.

[0026] The feeding part 1, the discharging part 2 and the transfer part 6 are integrally formed.

[0027] The feed portion 1, the discharge portion 2 and the transfer portion 6 are distributed in a U-shape or a V-shape.

[0028] The unloading device includes a sealing plate 7, a drain pipe 8 is installed in the middle of the sealing plate 7, and an adapter frame 9 for installing the sealing plate 7 is provided on the side wall of the adapter part 6. The adapter frame 9 not only plays a role in installation and positioning, but also ensures that the connection between the sealing plate 7 and the adapter part 6 remains sealed to avoid leakage of materials.

[0029] A filter screen 10 is provided at one end of the drain pipe 8 connected to the sealing plate 7 to prevent leakage of solid materials, and a conveying pipe 11 is provided at the other end. A sealing valve 12 is installed in the middle of the drain pipe 8. After the exchange of the formed molecular sieve is completed, the sealing valve 12 is first opened to drain the liquid. After the liquid is emptied, water is added for washing. After the washing is completed, the sealing plate 7 is opened again to take the cleaned molecular sieve out of the equipment for standby use.

[0030] The upper surface of the sealing plate 7 is arc-shaped, and the two ends are connected to the inner wall of the adapter 6 to form an arc surface. The drain pipe 8 is installed at the top of the arc so that it is located at the lowest end of the entire device to facilitate liquid discharge.

[0031] One end of the sealing plate 7 is hinged to the transfer frame 9, and the other end is connected to the transfer frame 9 through a buckle 13. The two sides of the sealing plate 7 are connected to the transfer frame 9 through a limit connecting rod 14. When the cleaned shaped molecular sieve needs to be removed, the connection between the sealing plate 7 and the transfer frame 9 is cancelled by the buckle 13, and the sealing plate 7 is rotated downward, and the shaped molecular sieve slides out of the equipment under the action of gravity, without manual unloading. It is simple and convenient with high unloading efficiency.

[0032] The limiting link 14 includes a cantilever 15 and a cantilever 16 which are respectively hinged on the transfer frame 9 and the sealing plate 7. A hinge point is provided at the connection between the cantilever 15 and the cantilever 16. The limiting link 14 can limit the rotation angle of the sealing plate 7, thereby realizing directional transportation of the formed molecular sieve and facilitating the collection of materials.

[0033] Operation process: when in use, first add the formed molecular sieve into the equipment through the solid addition port 4 on the feed part 1 and the discharge part 2, and then use the liquid flow port 3 on the feed part 1 to add liquid into the equipment to react with the formed molecular sieve. After the reaction is completed, the liquid is discharged through the drain pipe 8 at the bottom. After emptying, close the drain pipe 8 and add clean water to the equipment for washing. After washing is completed, use the drain pipe 8 to drain the cleaning water, and open the sealing plate 7 to take out the formed molecular sieve.

[0034] During cleaning, a drainage pipe can also be added to the liquid flow port 3 on the discharge part 2. The drainage pipe is located at one end inside the discharge part 2 and is provided with a filter screen, and the other end is located outside the equipment and is equipped with a drainage pump. In this way, continuous and long-term flushing operations can be performed. After flushing is completed, the cleaning water in the equipment can be discharged using the drainage pipe 8.

[0035] It should be noted that in the description of the present invention, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0036] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0037] The term "comprise" or any other similar term is intended to cover a non-exclusive inclusion, such that a process, article, or apparatus / device that includes a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, article, or apparatus / device.

[0038] So far, the technical solution of the present invention has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A reaction device for post-treatment of formed molecular sieves, characterized in that: The invention comprises a feed part (1) and a discharge part (2), wherein the upper parts of the feed part (1) and the discharge part (2) are both provided with a liquid flow port (3), a solid addition port (4) and a sampling port (5), the feed part (1) and the discharge part (2) are arranged parallel to each other, and the bottom parts are connected via a transition part (6), the feed part (1), the discharge part (2) and the transition part (6) are arranged in a U-shape or a V-shape, and a discharge device is provided at the lower part of the transition part (6).

2. The reaction device for post-treatment of formed molecular sieve according to claim 1, characterized in that: The feeding portion (1), the discharging portion (2) and the transition portion (6) are integrally formed.

3. The reaction device for post-treatment of formed molecular sieve according to any one of claims 1 to 2, characterized in that: The discharge device comprises a sealing plate (7), a liquid discharge pipe (8) is arranged in the middle of the sealing plate (7), and an adapter frame (9) for mounting the sealing plate (7) is arranged on the side wall of the adapter portion (6).

4. The reaction device for post-treatment of formed molecular sieve according to claim 3, characterized in that: A filter screen (10) is provided at one end of the drain pipe (8) connected to the sealing plate (7), and a delivery pipeline (11) is provided at the other end. A sealing valve (12) is provided in the middle of the drain pipe (8).

5. The reaction device for post-treatment of formed molecular sieve according to claim 3, characterized in that: The upper surface of the sealing plate (7) is arc-shaped.

6. The reaction device for post-treatment of formed molecular sieve according to claim 3, characterized in that: One end of the sealing plate (7) is hinged to the adapter frame (9), and the other end is connected to the adapter frame (9) via a buckle (13); both sides of the sealing plate (7) are connected to the adapter frame (9) via a limit connecting rod (14).

7. The reaction device for post-treatment of formed molecular sieve according to claim 6, characterized in that: The limiting connecting rod (14) comprises a cantilever arm 1 (15) and a cantilever arm 2 (16) which are respectively hinged on the adapter frame (9) and the sealing plate (7), and a hinge point is provided at the connection between the cantilever arm 1 (15) and the cantilever arm 2 (16).

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