Cyclohexanol Hydration Catalyst Filtration Device

Abstract

The present invention discloses a filtration device for cyclohexanol hydration catalyst, including a pressure vessel. It is characterized in that a micron-level filter element is arranged inside the pressure vessel, a liquid collecting pipe is arranged inside the filter element, micro valves are circumferentially arranged on the inner wall of the liquid collecting pipe, and a weight device is designed at the top of the valves, which can automatically close and tighten the valves without external force to ensure that gas will not overflow from the valve orifice during backwashing; the weight device is connected to the valve plate through a central shaft. When the liquid passes through the valve in the positive horizontal direction, the liquid impacts the valve plate to open, realizing the smooth passage of the liquid. The filtration device for cyclohexanol hydration catalyst of the present invention intercepts tiny catalyst particles through a deep filtration precision device, solving the problem of frequent blockage of the rectification tower.

Description

Technical Field

[0001] The present invention belongs to the field of chemical production, and relates to a filtration device for intercepting a large number of catalyst particles with tiny particle sizes entrained from a hydration reactor in the process of producing cyclohexanol by a hydration method. Background Art

[0002] In the process of producing cyclohexanol by a hydration method, the hydration reaction catalyst is aluminosilicate with a particle size ≤ 6 μm. The particle size is tiny and it is extremely easy to escape from the outlet of the hydration reactor and be entrained into the subsequent rectification column, resulting in frequent blockage of the trays in the rectification column, seriously restricting the normal full-load production of the device and affecting the economic benefits of the enterprise. At present, there is no effective means in the industry to solve this problem.

[0003] In chemical production, many liquid-solid filtration conditions require the use of precision filter elements as the core filtration material. Through the interception effect, impurities are intercepted outside and inside the filter element to form a filter cake. As the operation time increases, the filter cake layer becomes thicker, adheres to the inside and surface of the filter element, and cannot fall off by its own weight, greatly reducing the filtration area of the filter element.

[0004] Traditional cleaning technologies generally adopt the form of pressurized backwashing with clean gas, which requires equipment switching, liquid drainage, pressurized backwashing, etc. It has poor effects on impurities with a certain viscosity and working conditions with a relatively thick filter cake layer. At the same time, when a piece of filter cake on the surface of the filter element falls off, it will cause gas short-circuiting and the whole filter element cannot be cleaned; in addition, the equipment can only be disassembled, the filter element is removed for off-line manual cleaning, which is time-consuming and laborious, and is extremely easy to generate cleaning wastewater, causing secondary pollution. Summary of the Invention

[0005] The purpose of the present invention is to provide a filtration device for cyclohexanol hydration catalyst, which intercepts tiny catalyst particles through a deep filtration precision device to solve the problem of frequent blockage of the rectification column.

[0006] The technical solution of the present invention is: a filtration device for cyclohexanol hydration catalyst, including a pressure vessel. The feature is that a micron-level filter element is arranged inside the pressure vessel, a liquid collecting pipe is arranged inside the filter element, micro valves are arranged circumferentially on the inner wall of the liquid collecting pipe, and a weight device is designed at the top of the valve, which can automatically close and tighten the valve without external force to ensure that gas will not overflow from the valve orifice during backwashing; the weight device is connected to the valve plate through a central axis. When the liquid passes through the valve in the positive horizontal direction, the liquid impacts the valve plate to open, realizing the smooth passage of the liquid.

[0007] A turbid liquid inlet is arranged on the pressure vessel shell on one side of the micron-level filter element, a clear liquid outlet is arranged at the top of the pressure vessel shell, and an off-line backwashing port is arranged beside the clear liquid outlet to perform backwashing by using the switching opportunity to regenerate the filter element; a differential pressure gauge is arranged on the inlet and outlet side of the pressure vessel shell, and a sewage discharge port is arranged at the bottom of the pressure vessel for sewage discharge.

[0008] The features of the present invention are as follows:

[0009] 1. By arranging a specially designed liquid collecting pipe device inside the filter element, during normal operation, the micro-valves arranged on the liquid collecting pipe device will open, enabling the filtered clean liquid to converge through the valves and be discharged from the top outlet of the filter element, without affecting the normal and stable operation of the filter element. When the filter element enters the cleaning operation, there is no need to drain the liquid. Instead, clean gas is directly introduced from the top of the liquid collecting pipe. At this time, the micro-valves are closed, and the gas penetrates deep into the bottom of the filter element along the gas guiding device and then is discharged, forming a large number of bubbles in the liquid. The bubbles bulge from the bottom to the top through the entire filter element, and the filter cake layer is impacted by the generated liquid film impact effect, making the filter cake layer loose and fall off. Subsequently, it falls and deposits at the bottom of the equipment and is discharged from the equipment along with the sewage discharge operation.

[0010] 2. The core of the present invention is the micro-valve assembly arranged inside the filter element, which is equipped with an automatic return and locking device. When the filter element performs normal filtration operation, the micro-valves open forward, and the filtered liquid passes through the valves normally from the outside to the inside. After accumulating in the liquid collecting pipe, it is discharged from the top. When entering the backwashing operation, the liquid inlet valve of the equipment is closed, and the filtration process stops. At this time, no liquid medium passes through the micro-valves, so the micro-valves gradually close automatically and return to the closed position tightly. Subsequently, backblowing gas is introduced. The backblowing gas is introduced from the top of the liquid collecting pipe, and the micro-valves continue to remain closed. The backblowing gas directly enters the bottom of the liquid collecting pipe and is discharged from the bottom of the liquid collecting pipe, forming bubbles. The bubbles bulge from the bottom to the top through the entire filter element, and the filter cake layer is impacted by the generated liquid film impact effect, making the filter cake layer loose and fall off. Subsequently, it falls and deposits at the bottom of the equipment, and the filter element is thus thoroughly cleaned and regenerated.

[0011] 3. The filter material of the present invention has high mechanical strength, can be repeatedly cleaned and reused, and can completely solve the problem of blockage of the rectification tower. It is an ideal choice for the filtration device of the cyclohexanol catalyst by the hydration method.

[0012] 4. The device of the present invention has a compact structure and reasonable design. Through the micron-level filtration element, the comprehensive filtration accuracy can reach the sub-micron level, intercepting a large number of tiny catalyst particles entrained from the hydration reactor, effectively protecting the normal operation of subsequent equipment such as the rectification tower.

[0013] 5. The device of the present invention is designed precisely and exquisitely, and can be directly modified inside the existing filter element, which can greatly improve the cleaning and regeneration effect of the existing filter element, effectively improve the existing filter element regeneration means in the industry, and solve the actual production problems of users. Description of the Drawings

[0014] To more clearly illustrate the technical solutions of the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0015] Figure 1 is the structural schematic diagram of the present invention.

[0016] Figure 2 is the sectional view of the filter element 7, which contains a liquid collecting pipe 8 and a micro-valve 9.

[0017] Figure 3 is the principle schematic diagram of the micro-valve 9, which contains a counterweight device 10 and a valve plate 11.

[0018] Explanation of the reference numerals in the drawings: turbid liquid inlet 1, clear liquid outlet 2, sewage outlet 3, backwashing port 4, differential pressure gauge interface 5 / 6, filter element 7, liquid collecting pipe 8, micro-valve 9, counterweight device 10, valve plate 11, pressure vessel 12. Detailed implementation manners

[0019] In order to make the objectives, technical solutions and advantages of the present invention clearer, the following will describe the technical solutions of the present invention in detail. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other implementation manners obtained by those of ordinary skill in the art without creative efforts fall within the scope protected by the present invention.

[0020] As Figure 1 shown, the device of the present invention is finally supplied in the form of a pressure vessel 12. A turbid liquid inlet 1 is provided on one side of the shell of the pressure vessel 12, and an offline backwashing port 4 is provided at the top of the shell. Backwashing is carried out by using the switching opportunity to regenerate the filter element. A differential pressure gauge 5 / 6 is provided on the inlet and outlet sides of the clear liquid outlet 2 of the shell, which can monitor the operation of the equipment in real time. When the differential pressure of the equipment is large, the equipment can be cut out for backwashing regeneration, or the filter element 7 can be removed for thorough cleaning and regeneration, and the operation is convenient.

[0021] The bottom of the equipment is a storage space for catalyst particles. When the accumulation of particulate matter reaches a certain amount, the bottom sewage outlet 3 is opened for sewage discharge.

[0022] As Figure 2As shown, when the filter element 7 is performing normal filtration operation, the liquid medium passes from the outside to the inside through the filter layer of the filter element and enters the inside of the filter element. At this time, the micro-valve 9 is opened forward, and the filtered liquid passes through the micro-valve 9 normally from the outside to the inside. After accumulating in the liquid collecting pipe 8, it is discharged from the top clear liquid outlet 2; when entering the backwashing operation, the liquid medium stops passing through the filter element 7. At this time, no liquid medium passes through the micro-valve 9, so the micro-valve 9 gradually closes automatically and returns to the closed position tightly. Subsequently, clean backblowing gas is introduced from the top of the liquid collecting pipe 8. The micro-valve 9 continues to remain in the closed state, and the backblowing gas is directly introduced into the bottom of the liquid collecting pipe 8 and discharged from the bottom of the liquid collecting pipe 8 to form bubbles. The bubbles bulged pass through the entire filter element 7 from bottom to top, and impact the filter cake layer through the generated liquid film impact effect, making the filter cake layer loose and fall off. Subsequently, the fallen filter cake deposits at the bottom of the equipment, and the filter element 7 is thus thoroughly cleaned and regenerated.

[0023] Figure 3 Figure 4 is a schematic diagram of the principle of the micro-valve 9. A weight device 10 is designed at the top of the valve, which can automatically close and tighten the valve without external force, ensuring that gas will not overflow from the valve port during backblowing; the weight device 10 is connected to the valve plate 11 through the central axis. When the liquid passes through the valve 9 horizontally forward, the liquid impacts the valve plate 11 to open, realizing the smooth passage of the liquid.

[0024] This device is made of special stainless steel, with reliable quality, ensuring that the whole device is clean and free of impurities, and avoiding introducing impurities to contaminate the liquid. At the same time, the overall production is small and precise, and will not bring additional weight or other burdens to the filter element.

[0025] The characteristic of this device is to adopt a micron-level filter element with a micro-valve. The stainless steel material is processed into micron-level powder materials, and the micron-level filter element is formed through raw material preparation (precision control), equal-diameter compaction (strength control), vacuum sintering (forming control), calibration, and processing. It has high temperature resistance, corrosion resistance, high precision, high mechanical strength, and high material utilization rate. By comprehensively using the principles of surface filtration, deep filtration, collision interception, diffusion interception, etc., it can effectively and precisely intercept tiny particles with remarkable effects.

[0026] The process medium enters the device from the turbid liquid inlet 1, passes through the internal micron-level filter element, and the catalyst particles are intercepted outside the filter material. The clean liquid is discharged from the top clear liquid outlet 2 of the equipment. A filter cake layer is formed on the surface of the filter material as the particulate matter accumulates, further improving the filtration accuracy. When the filter cake accumulates to a certain thickness, it falls into the lower part of the device and is discharged through the sewage outlet 3.

[0027] The differential pressure gauge interface 5 / 6 is used to monitor the operating differential pressure of the equipment. When the differential pressure is high, the backblowing port 4 is opened, and backblowing gas is introduced to backblow the filter material to regenerate it.

[0028] This device is made of special stainless steel to ensure the cleanliness inside the equipment and avoid introducing impurities to contaminate the medium. Process calculations are carried out according to the working conditions to determine the specifications of the device, the quantity and form of the core components, etc., and adjustments can also be made according to the process requirements.

[0029] As mentioned above, it is only the specific implementation manners of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention.

Claims

1. A filtration device for cyclohexanol hydration catalyst, comprising a pressure vessel (12), characterized in that inside the pressure vessel (12) is provided with a micron-level filter element (7), inside the filter element is arranged a liquid collecting pipe (8), micro valves (9) are circumferentially arranged on the inner wall of the liquid collecting pipe (8), a counterweight device (10) is designed at the top of the valve (9), which can automatically close and tighten the valve without external force to ensure that gas will not overflow from the valve orifice during backwashing; the counterweight device (10) is connected to a valve plate (11) through a central axis, when the liquid passes through the valve (9) in the positive horizontal direction, the liquid impacts the valve plate (11) to open, realizing the smooth passage of the liquid.

2. The cyclohexanol hydration catalyst filtration device according to claim 1, characterized in that on the shell of the pressure vessel (12) on one side of the micron-level filter element (7) is provided with a turbid liquid inlet (1), at the top of the shell of the pressure vessel (12) is provided with a clear liquid outlet (2), and beside the clear liquid outlet (2) is provided an offline backwashing port (4) to perform backwashing by using the switching opportunity to regenerate the filter element; on the inlet and outlet sides of the shell of the pressure vessel (12) is provided a differential pressure gauge, and at the bottom of the pressure vessel (12) is provided a blowdown port (3) for blowdown.

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