Tubular member and application thereof in hydrogenation method

Abstract

The invention relates to a tubular member and application thereof in a hydrogenation method. The tubular component comprises a tubular channel and a tube wall surrounding the tubular channel, the tube wall is provided with at least one through hole and at least one porous component covering the at least one through hole, the hole diameter of the through hole is larger than that of the porous component, and the hole opening area of the through hole is larger than that of the porous component when multiple through holes exist. The ratio A / B of the sum of the opening areas of all the through holes > A to the opening areas of the porous members (the sum of the opening areas of all the porous members when a plurality of the through holes exist) B is 0.05-1. The tubular member provided by the invention can intercept the catalyst in the reaction kettle, and has the advantages of high separation efficiency, no need of additional backflushing system, long service life of equipment and the like.

Description

Technical Field

[0001] The present invention relates to the field of chemical production, and more particularly to a tubular component and application thereof in a hydrogenation method. Background Art

[0002] Stirring and filtering are common processes in hydrogenation reactions. A stirring device is a widely used mechanical device, primarily used to stir materials and ensure thorough mixing. For example, patent CN213557030U utilizes multiple sets of stirring blades installed on the inner side of the reactor to promote thorough and uniform mixing of materials, accelerate reaction rates, and increase production speed.

[0003] Patent CN211706062U discloses a catalyst filter for use in the caprolactam hydrorefining process. The invention uses a barrel-shaped filter for separation. The catalyst accumulates in the barrel-shaped filter and can be poured out from the circular hole for easy collection and recovery.

[0004] Patent CN216727218U is a stirring device for preparing sodium gluconate with a filtering mechanism. By setting a rotatable filtering channel, the particulate matter in the material is filtered when the material and solution are stirred. The particulate matter is trapped in the filtering channel and the material is thrown into the tank to prevent the material in the tank from containing particulate impurities and affecting the stirring quality.

[0005] In actual production, catalytic hydrogenation can be categorized as either intermittent or continuous. Compared to continuous production, intermittent production offers advantages such as flexible operation, variable production, low investment, and simple equipment. It is suitable for producing small batches, a wide variety of products, and long reaction times. Continuous hydrogenation offers reliable safety and a high degree of automation, making it suitable for large-scale production. However, existing continuous hydrogenation processes collect the reaction liquid in a separation unit for separation, with the catalyst then flowing back into the reactor. This requires an additional backflushing system, and the backflushing process can lead to wear and blockage, resulting in low catalyst utilization efficiency. Improving catalyst utilization, reaction efficiency, and reducing energy consumption are crucial. Summary of the Invention

[0006] The inventors of the present invention have found that the existing stirring devices can fully stir and mix the reaction materials, but there are relatively few inventions of devices in which the stirring device also has a filtering function. One way to trap the catalyst is separation outside the reaction vessel, that is, the reaction slurry is collected in a separation tank for separation of the catalyst and the product, and then the catalyst flows back into the reaction vessel. The catalyst cannot continuously achieve catalytic action in the reactor; the other is separation inside the reaction vessel, by installing a filter membrane at the outlet of the reactor, the catalyst is trapped in the reactor, and the reaction liquid enters the next unit, but this method has the problems of low filtration flux and low separation efficiency, and because the catalyst easily clogs the filter membrane, it is necessary to install an additional backflushing system to regularly clean the filter membrane. How to efficiently separate the catalyst and the reaction liquid in the reaction vessel so that the catalyst is trapped in the kettle for recycling is still a problem that needs to be solved urgently.

[0007] To this end, the inventors of the present invention, through diligent research, discovered that by using tubular components, more specifically, a hollow tubular channel and a tube wall surrounding the tubular channel, with through-holes provided in the tube wall and a porous component covering the tube wall, it is possible to achieve not only efficient separation of the catalyst and reaction liquid within the reactor but also a self-cleaning function for the stirring device, thereby resolving the aforementioned technical problems of the prior art. The present invention is based on this discovery.

[0008] Specifically, the present invention relates to the following aspects.

[0009] 1. A tubular member (such as a stirring device), comprising a tubular channel and a tube wall surrounding the tubular channel, wherein the tube wall is provided with at least one through hole (such as 1-100, preferably 3-30 or 3-6) and at least one porous member (such as 2-20, preferably 2-10 or 2-4) covering the at least one through hole, wherein the pore diameter of the through hole is larger than the pore diameter of the porous member, and the ratio A / B of the opening area of ​​the through hole (when there are multiple through holes, the sum of the opening areas of all the through holes) to the opening area of ​​the porous member (when there are multiple porous members, the sum of the opening areas of all the porous members) B is 0.05-1 (preferably 0.2-0.5).

[0010] 2. The tubular member of any preceding or following aspect, wherein the tubular member is a straight tube with one end closed (referred to as the closed end) and the other end open (referred to as the open end), and / or the ratio of the length H of the tubular channel to the radius R of the tubular channel is 2-100 (preferably 5-50), and / or the radial distance L between the porous member (inner surface) and the tube wall (outer surface) is 0.1-1 (preferably 0.3-0.5) of the radius R of the tubular channel.

[0011] 3. The tubular member of any of the preceding or following aspects, wherein the pore size of the through hole is 1-50 mm (preferably 3-20 mm), and / or the pore size of the porous member is 0.5-100 μm (preferably 10-50 μm), and / or the ratio of the pore size of the through hole to the pore size of the porous member is greater than 10 (e.g., greater than 200, preferably 300-400).

[0012] 4. The tubular member according to any one of the preceding or following aspects, wherein the porous member is a filtering mechanism, preferably at least one selected from a mesh, a filter membrane, a grid, a perforated plate and a sintered metal.

[0013] 5. The tubular member described in any of the preceding or following aspects, wherein the porous member covers the tube wall around the central axis of the tubular member to form a closed curved surface (preferably a cylinder), and / or the porous member is sealed to the tube wall (for example, through a conical slope).

[0014] 6. The tubular member described in any of the above or following aspects further includes at least one blade (e.g., 1-20, preferably 2-10).

[0015] 7. The tubular member according to any one of the preceding or following aspects, wherein the plurality of blades and the plurality of porous members are alternately arranged along the axial direction of the tubular member.

[0016] 8. The tubular member described in any of the preceding or following aspects, wherein the length H1 of the porous member along the central axis direction of the tubular member (if there are multiple porous members, the sum of the lengths H1 of all the porous members) is 20-80% (preferably 30-60%) of the length H of the tubular channel.

[0017] 9. A container (such as a reaction container) comprising an inner cavity for accommodating a fluid, a feed port, a discharge port and a stirring device, wherein the stirring device is a tubular member as described in any one of the preceding or following aspects.

[0018] 10. The container of any one of the preceding or following aspects, wherein the open end of the tubular member constitutes the discharge port, so that the fluid enters the tubular passage through the porous member and the through hole of the tubular member and leaves the container through the tubular passage.

[0019] 11. The container of any preceding or following aspect, wherein the fluid comprises solid particles having an average particle size of 1-1000 μm (preferably 20-300 μm), and / or the mass content of the solid particles in the fluid is 3-40 wt% (preferably 10-20%).

[0020] 12. A container as described in any preceding or following aspect wherein the entire porous member is submerged in the fluid.

[0021] 13. A hydrogenation method comprising the step of subjecting a reaction raw material to a hydrogenation reaction in the presence of solid catalyst particles to obtain a hydrogenated product, wherein the hydrogenation reaction is carried out in the presence of the tubular member described in any one of the preceding or following aspects or in the container described in any one of the preceding or following aspects.

[0022] Technical Effects

[0023] The present invention adopts a tubular component with both stirring and filtering functions, which can achieve continuous separation of catalyst and product. The porous cylindrical filter screen filters the catalyst particles, trapping the catalyst in the container. The product passes through the filter screen and then enters the hollow channel from the through hole on the tube wall for discharge, with high separation efficiency. Moreover, during the operation of the stirring device of the present invention, due to the force of the blades, the liquid comes into tangential contact with the surface of the filter mechanism during rotation, so that the solid particles deposited on the surface are continuously washed away by the shear force, thereby achieving a self-cleaning function without the need to install an additional backflushing system. The reaction can run continuously for a long time, the filtration efficiency is high and can be maintained constant, and the filter screen remains free of clogging even after long-term operation and does not require cleaning.

[0024] The hydrogenation reactor of the present invention adopts a tubular component with both stirring and filtering functions. While stirring and mixing, it can also achieve continuous separation of the solid-liquid system of catalyst and product. The cylindrical filter screen filters the catalyst particles, traps the catalyst in the container, and the product passes through the filter screen and then enters the hollow channel from the through hole on the tube wall to discharge, with high separation efficiency. Moreover, during the operation of the stirring device, due to the force of the blades, the liquid comes into tangential contact with the surface of the filter mechanism during rotation, so that the solid particles deposited on the surface are continuously washed away by the shear force and fall off, thereby achieving a self-cleaning function without the need to install an additional backflushing system. The reaction can run continuously for a long time, the filtration efficiency is high and can be maintained constant, and the filter screen still does not get clogged when running for a long time, and does not need to be cleaned or the cleaning cycle is long.

[0025] The tubular member comprises a hollow tubular passageway and a tube wall, the tube wall being provided with through-holes and a porous member covering the through-holes. Specifically, the tubular member comprises a tube wall longitudinally and coaxially surrounding the tubular passageway and a cylindrical filter covering the tube wall, ensuring high filtration flux. The tubular member combines stirring and filtering functions, achieving continuous and efficient separation of product and catalyst within the reactor, maximizing catalyst utilization and improving reaction efficiency. The cylindrical filtration mechanism offers advantages such as a large filtration area, high flux, and excellent filtration performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1This is an embodiment of a tubular component, wherein 1 is the central axis, 2 is the tubular channel, 3 is the tube wall, 4 is the conical slope, 5 is the filter screen, 6 is the through hole, and 7 is the stirring blade. DETAILED DESCRIPTION

[0027] The specific embodiments of the present invention are described in detail below. However, it should be noted that the protection scope of the present invention is not limited by these specific embodiments, but is determined by the claims in the appendix.

[0028] All publications, patent applications, patents, and other references mentioned in this specification are incorporated herein by reference. Unless otherwise defined, all technical and scientific terms used in this specification have the meanings commonly understood by those skilled in the art. In the event of conflict, the definitions in this specification will prevail.

[0029] When this specification uses the prefix "well known to those skilled in the art", "prior art" or similar terms to introduce materials, substances, methods, steps, devices or components, the objects introduced by the prefix include those commonly used in the art when this application is filed, but also include those that are not commonly used at present but will become generally recognized in the art to be suitable for similar purposes.

[0030] In the context of this specification, by substantially it is meant that the deviation does not exceed 5%, preferably does not exceed 2% or 1%.

[0031] Unless otherwise specified, all percentages, parts, ratios, etc. mentioned in this specification are based on weight and pressure is gauge pressure.

[0032] In the context of this specification, if there are no specific operating conditions and additives, those known in the art are directly applicable without particular limitation.

[0033] In the context of this specification, any two or more embodiments of the present invention may be arbitrarily combined, and the technical solutions thus formed belong to part of the original disclosure of this specification and also fall within the scope of protection of the present invention.

[0034] According to one embodiment of the present invention, there is provided a tubular component, such as a stirring device, more particularly a stirring rod.

[0035] According to one embodiment of the present invention, the tubular member includes a tubular passage and a tube wall surrounding the tubular passage, wherein the tube wall is provided with at least one through hole and at least one porous member covering the at least one through hole. According to the present invention, the number of the through holes can be 1-100, preferably 3-30 or 3-6, and the number of the porous members can be 2-20, preferably 2-10 or 2-4. In addition, the so-called "covering" refers to the porous member covering the entire through hole, so that the external fluid must pass through the porous member to reach the through hole.

[0036] According to one embodiment of the present invention, the ratio A / B of the opening area of ​​the through hole (when there are multiple, the sum of the opening areas of all the through holes) A ​​to the opening area of ​​the porous member (when there are multiple, the sum of the opening areas of all the porous members) B is 0.05-1 (preferably 0.2-0.5). Here, the so-called "opening area" refers to the pore area of ​​the through hole or the area of ​​the opening area of ​​the porous member. According to the present invention, if the A / B ratio is too low, the porous member will filter faster than the through hole, the material will accumulate between the porous member and the hole, and the material transfer will be slow; if the A / B ratio is too high, the material will be transferred quickly and the filtration efficiency will be low.

[0037] According to one embodiment of the present invention, Figure 1 As shown, the tubular member is a straight tube with one end closed (referred to as the closed end) and the other end open (referred to as the open end).

[0038] According to one embodiment of the present invention, there is no particular limitation on the length H of the tubular channel and the radius R of the tubular channel. Those skilled in the art can select appropriate values ​​according to actual conditions. For example, H can be 20-3000 mm and R can be 10-300 mm. However, preferably, the ratio of the length H of the tubular channel to the radius R of the tubular channel is 2-100 (preferably 5-50).

[0039] According to one embodiment of the present invention, the radial distance L between the porous member (inner surface) and the tube wall (outer surface) is 0.1-1 (preferably 0.3-0.5) times the radius R of the tubular channel. If the L / R ratio is too low, the filtration area is small and the filtration flux per unit area increases, resulting in a larger pressure differential, a high filtration load, and a shorter cleaning cycle. If the L / R ratio is too high, although the filtration area of ​​the porous member increases, the reaction mass transfer effect is affected, and the reaction efficiency decreases.

[0040] According to one embodiment of the present invention, the aperture of the through hole is much larger than the aperture of the porous member. Generally speaking, the aperture of the through hole is 1-50 mm (preferably 3-20 mm), and the aperture of the porous member is 0.5-100 μm (preferably 10-50 μm). Preferably, the ratio of the aperture of the through hole to the aperture of the porous member is greater than 10 (e.g., greater than 200, preferably 300-400). If the ratio is too low, the filtration flux is low and the filtration efficiency is reduced; if the ratio is too high, the strength of the stirring shaft is affected.

[0041] According to one embodiment of the present invention, the porous member is a filter mechanism. According to the present invention, there is no particular limitation on the filter mechanism, and the filter mechanism may be any filter mechanism conventionally known in the art, such as at least one selected from a mesh, a filter membrane, a grid, a perforated plate, and a sintered metal.

[0042] According to one embodiment of the present invention, the porous member covers the tube wall around the central axis of the tubular member to form a closed curved surface (preferably a cylinder), such as Figure 1 Indicates.

[0043] According to one embodiment of the present invention, the porous member is sealed to the tube wall, such as Figure 1 According to the present invention, there is no particular limitation on the method or structure of the sealing connection, as long as it can ensure that the external atmosphere (such as fluid) cannot enter (such as leak into) the internal space between the porous structure and the tube wall through the connection portion. Specific examples include: Figure 1 The tapered slope is shown.

[0044] According to one embodiment of the present invention, the tubular member further comprises at least one paddle (e.g., 1-20, preferably 2-10), thereby constituting a stirring device with paddles. Taking into account manufacturing issues and stirring efficiency, when there are multiple paddles, the multiple paddles and the multiple porous members are alternately arranged along the axial direction of the tubular member.

[0045] According to one embodiment of the present invention, the length H1 of the porous member along the central axis of the tubular member (if multiple porous members are present, the sum of the lengths H1 of all the porous members) is 20-80% (preferably 30-60%) of the tubular channel length H. If the H1 / H ratio is too low, the number of porous member units increases, the structure becomes more complex, and the effective filtration surface is reduced. If the H1 / H ratio is too high, the number and installation of agitator paddles are affected.

[0046] According to one embodiment of the present invention, it also relates to a container, such as a reaction vessel or a reactor, which includes an inner cavity for accommodating a fluid, a feed port, a discharge port and a stirring device, wherein the stirring device is a tubular component described in any of the above or below aspects of the present invention.

[0047] According to one embodiment of the present invention, the open end of the tubular member constitutes the discharge port, so that the fluid enters the tubular channel through the porous member and the through hole of the tubular member and leaves the container through the tubular channel.

[0048] According to one embodiment of the present invention, the entire porous member is submerged in the fluid without being exposed in the gas phase space above the fluid, thereby ensuring that no reactive gas phase leaves the container via the porous member and the through-holes.

[0049] According to one embodiment of the present invention, the fluid contains solid particles with an average particle size of 1-1000 μm (preferably 20-300 μm). Preferably, the mass fraction of the solid particles in the fluid is 3-40% by weight, preferably 10-20%. A low solid content results in good filtration and a short cleaning cycle, but also reduces reaction efficiency. A high solid content results in good reaction, but reduces filtration flux and efficiency.

[0050] According to one embodiment of the present invention, there is also provided a hydrogenation method, comprising the step of subjecting a reaction feedstock to a hydrogenation reaction in the presence of solid catalyst particles to obtain a hydrogenated product. According to the present invention, except that the hydrogenation reaction is conducted in the presence of a tubular member as described in any preceding or subsequent aspect of the present invention, or in a container as described in any preceding or subsequent aspect of the present invention, other requirements for the hydrogenation method of the present invention may refer to conventional knowledge in the art and are not particularly limited.

[0051] According to one embodiment of the present invention, the solid catalyst particles are selected from at least one of supported hydrogenation catalysts and unsupported hydrogenation catalysts, preferably at least one of Raney metals, in particular Raney nickel.

[0052] According to one embodiment of the present invention, the hydrogenation reaction is carried out in the presence of a solvent, and the solvent is selected from at least one of C1-C10 alcohols, preferably at least one of C1-C4 alcohols, in particular ethanol.

[0053] According to one embodiment of the present invention, the operating conditions of the hydrogenation reaction include: reaction temperature of 30-100°C, reaction pressure of 0.1-10 MPa, reaction time of 10-240 min, and catalyst dosage of 3-40 wt% of the reaction raw materials.

[0054] According to one embodiment of the present invention, the reaction raw material is selected from at least one of C2-C18 alkane nitrile and C2-C18 alkane dinitrile, preferably selected from at least one of C6-C12 alkane nitrile and C6-C12 alkane dinitrile, in particular selected from at least one of hexanoonitrile, 1,6-adiponitrile, dodecanonitrile and 1,12-dodecane dinitrile.

[0055] According to one embodiment of the present invention, the hydrogenation product is selected from at least one of C2-C18 alkylamines and C2-C18 alkanediamines, preferably selected from at least one of C6-C12 alkylamines and C6-C12 alkanediamines, in particular selected from at least one of hexylamine, 1,6-hexanediamine, dodecylamine and 1,12-dodecanediamine.

[0056] Example

[0057] The present invention is further described in detail below with reference to examples, but the present invention is not limited to these examples.

[0058] Example 1

[0059] A tubular member (section view Figure 1 ), comprising a tubular channel and a tube wall surrounding the tubular channel, wherein the tube wall is provided with through holes and a porous component covering the through holes, the porous filtering component is a screen, of which there are 3, 3 through holes are opened on the outer tube wall of the hollow tubular channel (1 each at the top, middle and bottom), 3 layers of blades, A / B ratio is 0.3, H / R is 20, L / R is 0.4, the through hole diameter is 15 mm, H1 / H is 50%, and the average diameter of the filter holes on the filter screen is 40 μm.

[0060] A hydrogenation reaction was conducted in a reactor equipped with this tubular member. The reactor held 300 L of a solid-liquid mixture as the reaction material, containing 16 wt% of solid catalyst particles with an average particle size of 100 μm. The hydrogenation reaction was conducted continuously for 24 hours, with a catalyst particle filtration efficiency remaining essentially constant at approximately 99%. The filter screen remained free of clogging, allowing for a long cleaning cycle.

[0061] Example 2

[0062] The same as Example 1, except that A / B is 0.4.

[0063] The hydrogenation reaction was carried out continuously for 24 hours, and the filtration efficiency of the catalyst particles was basically constant at about 98%, the filter screen was not blocked, and the cleaning cycle was long.

[0064] Example 3

[0065] Same as Example 1, except that L / R is 0.05.

[0066] The hydrogenation reaction was continued for 20 hours, and the filtration efficiency of the catalyst particles remained substantially constant at about 82%. The filter screen was slightly clogged, and the cleaning cycle became shorter.

[0067] Example 4

[0068] Same as Example 1, except that L / R is 0.2.

[0069] The hydrogenation reaction was continued for 20 hours, and the filtration efficiency of the catalyst particles remained substantially constant at about 89%. The filter screen was slightly clogged, and the cleaning cycle was shortened.

[0070] Example 5

[0071] Same as Example 1, except that L / R is 1.5.

[0072] The hydrogenation reaction was continued for 20 hours, and the filtration efficiency of the catalyst particles remained substantially constant at about 80%. The filter screen was slightly clogged, and the cleaning cycle became shorter.

[0073] Example 6

[0074] Same as Example 1, except that L / R is 0.8.

[0075] The hydrogenation reaction was continued for 20 hours, and the filtration efficiency of the catalyst particles remained substantially constant at about 86%. The filter screen was slightly clogged, and the cleaning cycle became shorter.

[0076] Example 7

[0077] Same as Example 1, except that A / B is 0.1.

[0078] The hydrogenation reaction was continued for 5 hours, and the filtration efficiency of the catalyst particles remained substantially constant at about 42%. The filter screen was slightly clogged, and the cleaning cycle was short.

[0079] Example 8

[0080] The same as Example 1, the only difference is that A / B is 0.8.

[0081] The hydrogenation reaction was continued for 5 hours, and the filtration efficiency of the catalyst particles remained substantially constant at about 37%. The filter screen was slightly clogged, and the cleaning cycle was short.

[0082] Example 9

[0083] The same as Example 1, the only difference is that the ratio of the pore size of the through hole to the pore size of the porous member is 10.

[0084] The hydrogenation reaction was continued for 3 hours, and the filtration efficiency of the catalyst particles remained substantially constant at about 57%. The filter screen became clogged, and the cleaning cycle was short.

[0085] Example 10

[0086] The same as Example 1, the only difference is that the ratio of the pore size of the through hole to the pore size of the porous member is 200.

[0087] The hydrogenation reaction was continued for 3 hours, and the filtration efficiency of the catalyst particles remained substantially constant at about 52%. The filter screen was slightly clogged, and the cleaning cycle was short.

[0088] Example 11

[0089] The same as embodiment 1, the only difference is that the sum of the length H1 is 20% of the length H.

[0090] The hydrogenation reaction was continued for 10 hours, and the filtration efficiency of the catalyst particles remained substantially constant at about 69%. The filter screen was slightly clogged, and the cleaning cycle was shortened.

[0091] Example 12

[0092] The same as embodiment 1, the only difference is that the sum of the length H1 is 80% of the length H.

[0093] The hydrogenation reaction was continued for 10 hours, and the filtration efficiency of the catalyst particles remained substantially constant at about 78%. The filter screen was slightly clogged, and the cleaning cycle was shortened.

[0094] Example 13

[0095] The same as Example 1, except that the mass content of the solid particles is 2 wt%.

[0096] The hydrogenation reaction was continued for 20 hours, and the filtration efficiency of the catalyst particles remained substantially constant at about 60%. The filter screen was slightly clogged, and the cleaning cycle became shorter.

[0097] Example 14

[0098] The same as Example 1, except that the mass content of the solid particles is 8 wt%.

[0099] The hydrogenation reaction was continued for 20 hours, and the filtration efficiency of the catalyst particles remained substantially constant at about 66%. The filter screen was slightly clogged, and the cleaning cycle became shorter.

[0100] Example 15

[0101] The same as Example 1, except that the mass content of the solid particles is 30 wt%.

[0102] The hydrogenation reaction was continued for 20 hours, and the filtration efficiency of the catalyst particles remained substantially constant at about 77%. The filter screen was slightly clogged, and the cleaning cycle was shortened.

[0103] Example 16

[0104] The same as Example 1, except that the mass content of the solid particles is 45 wt%.

[0105] The hydrogenation reaction was continued for 15 hours, and the filtration efficiency of the catalyst particles remained substantially constant at about 58%. The filter screen was slightly clogged, and the cleaning cycle was shortened.

[0106] Comparative Example 1

[0107] The same as Example 1, except that the A / B ratio is 0.035.

[0108] The hydrogenation reaction was carried out continuously for 4 hours, and the filtration efficiency of the catalyst particles remained substantially constant at about 30%. The filter screen was severely clogged, and the cleaning cycle was short.

[0109] Comparative Example 2

[0110] The same as Example 1, except that the A / B ratio is 1.25.

[0111] The hydrogenation reaction was continued for 4 hours, and the filtration efficiency of the catalyst particles remained substantially constant at about 44%. The filter screen was severely clogged, and the cleaning cycle was short.

[0112] Comparative Example 3

[0113] The same as Example 1, the only difference is that the aperture of the through hole is smaller than the aperture of the porous component. More specifically, the tube wall is a porous sintered metal, and the porous component is a screen.

[0114] The hydrogenation reaction was continued for 2 hours, and the filtration efficiency of the catalyst particles remained substantially constant at about 16%. The filter screen was severely clogged, and the cleaning cycle was short.

Claims

1. A tubular member (such as a stirring device), comprising a tubular channel and a tube wall surrounding the tubular channel, wherein the tube wall is provided with at least one through hole (such as 1-100, preferably 3-30 or 3-6) and at least one porous member (such as 2-20, preferably 2-10 or 2-4) covering the at least one through hole, wherein the pore diameter of the through hole is larger than the pore diameter of the porous member, and the ratio A / B of the opening area of ​​the through hole (when there are multiple through holes, the sum of the opening areas of all the through holes) to the opening area of ​​the porous member (when there are multiple porous members, the sum of the opening areas of all the porous members) B is 0.05-1 (preferably 0.2-0.5).

2. The tubular member of claim 1 , wherein the tubular member is a straight tube with one end closed (referred to as the closed end) and the other end open (referred to as the open end), and / or the ratio of the length H of the tubular channel to the radius R of the tubular channel is 2-100 (preferably 5-50), and / or the radial distance L between the porous member (inner surface) and the tube wall (outer surface) is 0.1-1 (preferably 0.3-0.5) of the radius R of the tubular channel.

3. The tubular member of claim 1, wherein the pore size of the through hole is 1-50 mm (preferably 3-20 mm), and / or the pore size of the porous member is 0.5-100 μm (preferably 10-50 μm), and / or the ratio of the pore size of the through hole to the pore size of the porous member is greater than 10 (e.g., greater than 200, preferably 300-400).

4. The tubular member of claim 1, wherein the porous member is a filtering mechanism, preferably at least one selected from the group consisting of a mesh, a filter membrane, a grid, a perforated plate, and a sintered metal.

5. The tubular member of claim 1, wherein the porous member covers the tube wall around the central axis of the tubular member to form a closed curved surface (preferably a cylinder), and / or the porous member is sealed to the tube wall (such as through a conical slope).

6. The tubular member of claim 1, wherein the length H1 of the porous member along the central axis direction of the tubular member (if there are multiple porous members, the sum of the lengths H1 of all the porous members) is 20-80% (preferably 30-60%) of the length H of the tubular channel.

7. A container (such as a reaction container), comprising an inner cavity for accommodating a fluid, a feed port, a discharge port, and a stirring device, wherein the stirring device is the tubular member according to claim 1.

8. The container of claim 7, wherein the open end of the tubular member constitutes the discharge port, so that the fluid enters the tubular passage through the porous member and the through hole of the tubular member and leaves the container through the tubular passage.

9. The container of claim 7, wherein the fluid comprises solid particles having an average particle size of 1-1000 μm (preferably 20-300 μm), and / or the mass content of the solid particles in the fluid is 3-40 wt% (preferably 10-20 wt%).

10. A hydrogenation method comprising the step of subjecting a reaction raw material to a hydrogenation reaction in the presence of solid catalyst particles to obtain a hydrogenated product, wherein the hydrogenation reaction is carried out in the presence of the tubular member according to claim 1 or in the container according to claim 7.

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