Equipment for handling easily polymerizable substances

Abstract

[Problem] To prevent or to suppress generation of a polymer material in an internal space of a protruding portion. [Solution] A handling device 100 comprises a communication portion 10, a protruding portion 30, a spray unit 40, and a grid 50. The spray unit can be arranged in an internal space 31 of the protruding portion and is configured to be able to spray liquid on an inner wall surface of the protruding portion in the state in which the spray unit is arranged in the internal space. The grid is arranged on a boundary between a flow passage 11 of the communication portion and the internal space of the protruding portion and blocks movement of an irregular packing material F packed in a packed bed 17 to the internal space.

Description

[Technical Field]

[0001] The present invention relates to an apparatus for handling an easily polymerizable substance. [Background technology]

[0002] It is well known that easily polymerizable substances such as (meth)acrylic acid are very susceptible to polymerization, and that polymerization often occurs during the production process, forcing the shutdown of the plant. To prevent this, polymerization inhibitors such as hydroquinone and phenothiazine are used, and molecular oxygen-containing gases are introduced.

[0003] In the production process of easily polymerizable substances such as (meth)acrylic acid, a packed column is sometimes used for collection and purification, but the formation of polymers is inevitable even in this packed column. In such packed column, easily polymerizable substances such as (meth)acrylic acid tend to accumulate in stagnant areas such as manholes, and the polymerization inhibitor is consumed in these areas, eventually resulting in the generation of polymers when the polymerization inhibitor becomes insufficient.

[0004] As described above, since the above-mentioned easily polymerizable substances such as (meth)acrylic acid are compounds that polymerize very easily, various techniques have been proposed for preventing polymerization in devices for handling easily polymerizable substances such as the above-mentioned packed tower. For example, Patent Document 1 discloses a technique for preventing polymerization due to retention by injecting liquid that may accumulate on trays inside a column for performing distillation or the like onto the inner wall surface of the device, such as a manhole, which is a stagnant portion. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] US Patent Application Publication No. 2017 / 0014730 Summary of the Invention [Problem to be solved by the invention]

[0006] In the packed tower serving as the above-described handling device for an easily polymerizable substance, packing such as random packing can be introduced into the device. Furthermore, an opening into which a manhole or the like can be installed is provided on the side of the packed bed in the flow path of the handling device, and an internal space is provided between the opening and the flow path. The present inventors have been studying a technique for preventing or suppressing the phenomenon in which an easily polymerizable substance such as (meth)acrylic acid remains in the internal space communicating with the opening into which a manhole or the like can be installed in the handling device, resulting in the formation of a polymer. [Means for solving the problem]

[0007] One aspect of the present invention is an easily polymerizable substance. A radically polymerizable monomer The handling device includes a flow section, a protrusion, a spray section, and a grid. radically polymerizable monomers The flow passage is formed, and a support member capable of packing random packing is provided in the flow passage. The protruding portion is located on the side of the packed bed packed with random packing in the flow passage. radically polymerizable monomers The flow path protrudes outward in a direction intersecting the flow direction of the fluid, and the protruding portion forms an internal space and an opening that is connected to the internal space and can be fitted with a lid to isolate the internal space from the outside. The spray unit can be arranged in the internal space of the protruding portion and is configured to be able to spray liquid onto the inner wall surface of the protruding portion when arranged in the internal space. The grid is arranged at the boundary between the flow path and the internal space and is configured to prevent the random packing packed in the packed bed from moving into the internal space. The spray unit can be inserted into the internal space from the side facing the packed bed with the grid sandwiched therebetween. [Effects of the Invention]

[0008] According to the device for handling an easily polymerizing substance according to one aspect of the present invention, it is possible to prevent or suppress the generation of polymers in the internal space of the protruding portion. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a schematic diagram showing an apparatus for handling an easily polymerizable substance according to one embodiment of the present invention. [Figure 2]2 is a diagram showing a flow path of a circulating portion and an internal space of a protruding portion in the handling device shown in FIG. 1. FIG. [Figure 3] 3 is a view of the handling device according to FIG. 2, seen from the direction in which a lid is placed on the opening of the protrusion. [Figure 4] 2 is a cross-sectional view showing a state in which a spray unit is disposed in the internal space of a protrusion in the handling device of FIG. 1. FIG. [Figure 5] FIG. 5 is a view showing a modified example of the spray unit and corresponds to FIG. 4. [Figure 6] FIG. 3 is a view showing a modified example of the spray unit and corresponds to FIG. 2. [Figure 7] FIG. 3 is a view showing a modified example of the spray unit and corresponds to FIG. 2. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The embodiments shown here are merely examples for embodying the technical concept of the present invention and are not intended to limit the present invention. Furthermore, all other embodiments, examples, and operational techniques that can be conceived by those skilled in the art without departing from the spirit of the present invention are included within the scope and spirit of the present invention, as well as within the scope of the claims and their equivalents.

[0011] Furthermore, for the convenience of illustration and ease of understanding, the drawings attached to this specification may be represented schematically with the scale, aspect ratio, shape, etc. appropriately changed from the actual product, but these are merely examples and do not limit the interpretation of the present invention.

[0012] In the following description, ordinal numbers such as "first" and "second" are used, but unless otherwise specified, these are used for convenience and do not stipulate any particular order.

[0013] In the following description, "easily polymerizable substance" refers to a radically polymerizable monomer that can be polymerized by temperature, pressure, contact, light, or the like. Examples of such easily polymerizable substances include unsaturated carboxylic acids such as acrylic acid, methacrylic acid, fumaric acid, maleic acid, and maleic anhydride, as well as esters thereof. Acrylic acid and / or methacrylic acid may be referred to as "(meth)acrylic acid."

[0014] Examples of hydroxyl group-containing compounds capable of forming an ester with the unsaturated carboxylic acid include aliphatic alcohols or alicyclic alcohols having from 1 to 12 carbon atoms. Examples of such hydroxyl group-containing compounds include monohydric alcohols such as methanol, ethanol, n-butanol, isobutanol, sec-butanol, t-butanol, 1-pentanol, 2-pentanol, 3-pentanol, cyclopentanol, 1-hexanol, 2-hexanol, 3-hexanol, cyclohexanol, 1-heptanol, 2-heptanol, 3-heptanol, 1-octanol, isooctanol, 2-ethylhexanol, isononyl alcohol, and lauryl alcohol; and polyhydric alcohols such as ethylene glycol and 1,2-propanediol; and these may be linear or branched.

[0015] Preferred easily polymerizable substances are acrylic acid, methacrylic acid, acrylic acid esters, or methacrylic acid esters, more preferably acrylic acid, methacrylic acid, methyl acrylate, ethyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, methyl methacrylate, ethyl methacrylate, butyl methacrylate, 2-ethylhexyl methacrylate, 2-hydroxyethyl methacrylate, or 2-hydroxypropyl methacrylate, and even more preferably acrylic acid or methacrylic acid.

[0016] In addition, in this specification, "handling" means at least one operation necessary for producing an easily polymerizable substance, such as reaction, distillation, extraction, absorption, storage, or heat exchange. Therefore, in this specification, "apparatus" means a reactor, distillation column, extraction column, absorption column, heat exchanger, tank, or the like used in carrying out the handling such as reaction, distillation, extraction, absorption, storage, or heat exchange. Note that a distillation column or the like in which flow paths are packed with packing is referred to as a packed column.

[0017] 1 to 7 are diagrams illustrating a handling device 100. The handling device 100 has a flow section 10, a support member 20, a protrusion 30, a spray section 40, and a grid 50. In addition to these, the handling device 100 has sections (13-16) through which gas or liquid flows. For ease of explanation, a coordinate system is illustrated in the drawings. X corresponds to the insertion direction of the spray section 40 (described later) and is referred to as the first horizontal direction X. Y is a direction perpendicular to the first horizontal direction X in the horizontal direction and is referred to as the second horizontal direction Y. Z is a direction perpendicular to the first horizontal direction X and the second horizontal direction Y and is referred to as the height direction Z.

[0018] The circulating section 10 is configured to form a flow path 11 through which a gaseous or liquid easily polymerizable substance-containing material flows, and to have a support member 20 that can be filled with random packing F installed in the flow path 11. The circulating section 10 is configured to form a flow path through which a gas or liquid flows in the handling device 100. In this embodiment, the circulating section 10 is configured to extend in the height direction Z.

[0019] As shown in Fig. 1, the flow section 10 is configured to have a liquid inlet 12, a gas inlet 13, a gas outlet 15, and a liquid outlet 16. An inlet 14 for reflux liquid obtained by cooling (condensing) the gas discharged from the gas outlet 15 is provided above the handling device (the flow path for cooling the gas is not shown). The gas inlet 13 is configured to be located below the gas outlet 15, and the liquid inlet 12 is configured to be located above the liquid outlet 16. The gas inlet 13 is configured to be located lower than the liquid inlet 12 in the height direction Z.

[0020] The support members 20 are configured to form a region in the fluid flow path 11 formed by the flow section 10 where random packing F is placed. The region in the flow section 10 where the random packing F is packed by the support members 20 can be called a packed layer 17. The support members 20 may be conventionally known support members, such as wire mesh packing support members or angle-folded plate packing support members. An angle-folded plate packing support member is shown, for example, in Figure 18-51 of Perry's Chemical Engineers' Handbook, 5th Edition.

[0021] 2, the support member 20 is configured to have a plurality of holes 21. By configuring it in this manner, the gas flowing in from the gas inlet 13 over the support member 20 and the liquid flowing in from the liquid inlet 12 can flow in the height direction Z in the internal space of the flow section 10.

[0022] As shown in Fig. 1, a packing presser 22 for pressing down the random packing F is provided on the upper surface of the packed bed 17, and a liquid distribution plate 23 is further provided above that. With this configuration, the liquid introduced from the liquid inlet 12 or the reflux liquid inlet 14 passes through the liquid distribution plate 23 and is poured evenly over the entire upper surface of the packed bed 17. The packing presser 22 can be similar to the support member 20. The liquid distribution plate 23 can be, for example, an open trough type, a pipe orifice type, or a fishbone type.

[0023] The random packing F is not particularly limited, but examples thereof include Raschig rings, Pall rings, Intalox saddles, Terralets, Cascade Mini Rings, and IMTP.

[0024] As shown in FIG. 2, the protruding portion 30 is disposed on the side of the packed bed 17 in which the random packing F is disposed in the flow section 10. The protruding portion 30 is provided so as to protrude outward in a horizontal direction intersecting the flow direction of the easily polymerizable substance-containing material. As shown in FIG. 2 and other figures, the protruding portion 30 is provided with an internal space 31 and an opening 32. The internal space 31 is configured to be able to communicate with the flow path 11 of the flow section 10 via a grid 50. The opening 32 is connected to the internal space 31 of the protruding portion 30, and is configured so that a lid L that isolates the internal space 31 from the outside can be installed. The manner in which the lid L is installed relative to the opening 32 is not particularly limited, but connection using a davit or hinge, etc., can be used.

[0025] The opening 32 can be configured to be large enough to allow an operator to enter through the lid L (manhole), large enough to allow an operator to insert their hand through the opening 32 (handhole), or large enough to allow a person to see the flow path of the flow section 10 through the opening 32. The lid L can be configured as a single unit using a known bolt BL and nut NT, etc. In this embodiment, the protrusion 30 is configured by a cylindrical side surface extending in the first horizontal direction X.

[0026] The spray unit 40 is insertable into the internal space 31 of the protrusion 30 through the lid L installed on the opening 32, and is configured to spray liquid onto the inner wall surface of the protrusion 30 when placed in the internal space 31. The spray unit 40 is configured so that the liquid sprayed onto the inner wall surface of the protrusion 30 flows down the inner wall surface of the protrusion 30 due to gravity, wetting the entire inner wall surface of the protrusion 30. Here, the entire inner wall surface of the protrusion 30 refers not only to the cylindrical inner surface that forms the internal space 31 of the protrusion 30, but also to the inner surface Ln of the lid L. The spray pattern (spray shape) of the spray unit 40 can be a flat water sprinkling type, a full surface water sprinkling type, a circular water sprinkling type, etc.

[0027] As shown in FIG. 4 and other figures, the spray unit 40 is configured to be insertable from the outside into the internal space 31 through an insertion hole Ls in the lid L that closes the opening 32. In this embodiment, the spray unit 40 is configured to spray liquid particularly upward in the installed state in the internal space 31 of the protruding part 30. In addition, in FIG. 4, the spray unit 40 is provided with one liquid ejection port 41. The ejection port 41 of the spray unit 40 can be arranged to face upward in the height direction Z (see FIGS. 2 and 4). When the spray unit 40 is not inserted into a portion of the lid L where the spray unit 40 is to be inserted, the corresponding portion can be blocked with a hole-filling cap, plug (not shown), or the like.

[0028] The grid 50 is disposed at the boundary between the flow paths 11 of the flow section 10 and the internal space 31, and is configured to prevent the random packing F disposed in the packed bed 17 from migrating into the internal space 31. The grid 50 is configured to include a wire mesh with numerous gaps of a predetermined size. With this configuration, when the lid L attached to the opening 32 is opened, an operator can see the internal space 31 of the protruding section 30 and the flow paths 11 of the flow section 10 through the opening 32. The size of the wire mesh of the grid 50 is not particularly limited as long as it can prevent the random packing F from entering the internal space 31, but can be configured to be 10 mm to 70 mm, for example.

[0029] The mesh size of the grid 50 is set to be equal to or smaller than the size (minimum dimension) of the random packing F so that the random packing F does not pass through the mesh from the flow path 11 and enter the internal space 31 of the protruding portion 30. The "minimum dimension" here refers to the smallest value among the dimensions such as length, width, height, and diameter that specify the shape of the random packing F in the specifications of the random packing F. In this embodiment, the grid 50 is configured to be detachable from the flow section 10 and the protruding portion 30 of the handling device 100. The grid 50 can be made of a material such as metal, but it is preferably made of a material similar to that of the random packing F.

[0030] As described above, in this embodiment, the handling device 100 includes the flow section 10, the protruding section 30, the spray section 40, and the grid 50. The flow section 10 forms a flow path 11 through which the easily polymerizable substance-containing material flows, and the flow path 11 is provided with a support member 20 that can be filled with random packing F. The protruding section 30 is provided in the flow section 10 on the side of the packed bed 17 filled with the random packing F, and protrudes outward in a direction intersecting the flow direction of the easily polymerizable substance. The protruding section 30 forms an internal space 31 at the protruding portion and an opening 32 that is connected to the internal space 31 and can accommodate a lid L that isolates the internal space 31 from the outside. The spray section 40 can be placed in the internal space 31 of the protruding section 30 and is configured to spray a liquid onto the inner wall surface of the protruding section 30 when placed in the internal space 31. The grid 50 is disposed at the boundary between the flow path 11 and the internal space 31 and prevents the random packing F packed in the packed bed 17 from moving into the internal space 31 .

[0031] Random packing is often used in handling equipment 100 used in distillation, absorption, extraction, and other operations in the production process of easily polymerizing substances. In the protruding portions directly connected to the packed bed of the random packing, the retention of easily polymerizing substances (especially retention of liquid condensed from the gas phase) is likely to result in the formation of polymers. Once polymers are formed in the protruding portions, they act as nuclei and gradually grow and accumulate, generating polymers in the packed bed, increasing the differential pressure in the packed bed and ultimately causing blockages within the equipment. This hinders the continuous operation of the handling equipment. Furthermore, removing the formed polymers is extremely difficult and requires significant removal costs.

[0032] In response to this, the handling device 100 provides the grid 50 as described above, preventing the random packing F from entering the internal space 31 where the spray unit 40 is installed, thereby ensuring sufficient space. Furthermore, while the grid 50 prevents the random packing F from entering the internal space 31, the entire inner wall surface of the protruding portion 30 can be wetted with liquid by spraying liquid upward from the spray unit 40. This prevents blockages due to polymerized material within the device. Furthermore, the handling device 100 includes the grid 50 and the spray unit 40, which facilitates continuous operation of the device and reduces the cost of removing polymerized material. Furthermore, by using the grid 50 to prevent the random packing F from entering the internal space 31, an operator who opens the lid L can inspect the internal space 31 and the flow path 11 located further back than the internal space 31 through the opening 32.

[0033] The liquid to be sprayed through the spray unit 40 is not particularly limited as long as it contains a polymerization inhibitor that prevents the polymerization of the easily polymerizable substance. For example, a liquid flowing out from the bottom of the packed tower, a reflux liquid introduced into the top of the tower, or a liquid obtained from another process can be used.

[0034] The mesh size of the grid 50 is set to be equal to or smaller than the minimum size of the random packing F. By configuring it in this way, it is possible to prevent the random packing F from entering the internal space 31 through the mesh of the grid 50.

[0035] Furthermore, the spray unit 40 sprays the liquid upward in the internal space 31 of the protruding part 30. With this configuration, after the liquid adheres to the inner wall surface at the upper part of the internal space 31, the liquid flows down the inner wall surface of the internal space 31 due to gravity. As a result, the entire inner wall surface constituting the internal space 31 of the protruding part 30 can be wetted with the liquid.

[0036] The grid 50 is configured to be detachable from the circulating portion 10. By configuring it in this way, maintenance of the flow path 11 of the circulating portion 10 of the handling device 100 and the like can be easily performed by an operator.

[0037] In addition, spray unit 40 is configured so that it can be inserted into internal space 31 from the outside through lid L that closes opening 32. With this configuration, spray unit 40 can be inserted into internal space 31 without removing lid L, and liquid can be sprayed into internal space 31 of protruding portion 30, thereby preventing or suppressing the generation of polymers by the easily polymerizable substance.

[0038] (Example) Next, an experiment was conducted to examine the wetting state of the polymerization inhibitor-containing liquid and the polymerization state of the easily polymerizable substance on the protruding portion 30 of the handling apparatus 100 according to this embodiment, and this will be described. In this experiment, acrylic acid gas was absorbed into water in a packed tower corresponding to the handling apparatus 100, which was filled with random packing F. In this experiment, the wetting state of the polymerization inhibitor-containing liquid on the inner wall surface of the protruding portion was examined for one example and three comparative examples as follows.

[0039] In Example 1, a grid 50 was installed at the boundary between the protruding portion 30 and the flow section 10 in the handling device 100. Then, the spray section 40 was inserted into the internal space 31 of the protruding portion 30 through the insertion hole in the lid L, and the polymerization inhibitor-containing liquid was sprayed upward. Hereinafter, in the explanation of the comparative example, the same reference numerals will be used for the components of the handling device 100 that are common to the examples for convenience. The grid 50 used had holes shaped like a lattice with a length and width of 50 mm. The spray section 40 used was a wide-angle flat water spray type 3 / 8EX-6200W (pipe diameter: 20A) manufactured by Niikura Kogyo Co., Ltd.

[0040] In Comparative Example 1, the packed tower corresponding to the handling device 100 has the same configuration as the Examples, except that a grid 50 is not installed at the boundary between the flow section 10 and the protruding section 30. In the packed tower according to Comparative Example 2, a grid 50 is installed at the boundary between the flow section 10 and the protruding section 30 as in Example 1, and a spray section 40 is not installed in the portion corresponding to the internal space 31 of the protruding section 30. In the packed tower according to Comparative Example 3, a grid 50 is not installed at the boundary between the flow section 10 and the protruding section 30 as in Example 1, and a spray section 40 is not installed in the internal space 31 of the protruding section 30.

[0041] Common conditions for Example 1 and the three comparative examples are that the diameter of the opening 32 of the protruding portion 30 is 500 mm, and the distance from the inner surface Ln of the lid L to the grid 50 is 80 mm. In Example 1, the position of the injection port 41 of the spray unit 40 (insertion position in the height direction Z: distance d1 in Figure 2) is 340 mm from the upper end of the inner wall surface of the protruding portion 30, and the distance d2 (see Figure 2) in the first horizontal direction X from the inner surface Ln of the lid L is 70 mm. The injection port 41 of the spray unit 40 was configured to be oriented along the height direction Z. Pall rings were used as the random packing F.

[0042] In Comparative Example 1, it was confirmed that the random packing F entered the internal space 31 of the protruding portion 30 from the flow section 10, and the presence of the random packing F in the spray range of the spray section 40 prevented the entire inner wall surface of the protruding portion 30 from being wetted with the liquid. As a result, the aqueous acrylic acid solution remained on the inner wall surface of the protruding portion 30, and polymers were formed in the remaining portions where the polymerization inhibitor had been consumed. This resulted in the formation of polymers in the packed layer 17, and the pressure loss in the packed tower increased.

[0043] In Comparative Example 2, the spray unit 40 was not used, and therefore the inner wall surface of the protruding portion 30 could not be wetted with the liquid. As a result, the aqueous acrylic acid solution remained on the inner wall surface of the protruding portion 30, and polymers were produced in the retaining portions where the polymerization inhibitor had been consumed. This resulted in the production of polymers in the packed layer 17, and the pressure loss in the packed tower increased.

[0044] In Comparative Example 3, since the grid 50 was not used, the random packing F entered the internal space 31 of the protruding portion 30, and since the spray portion 40 was not used, the inner wall surface of the protruding portion 30 could not be wetted with liquid. As a result, the aqueous acrylic acid solution remained on the inner wall surface of the protruding portion 30, and polymers were formed in the retaining portion where the polymerization inhibitor had been consumed. This caused polymers to be formed in the packed layer 17, and the pressure loss in the packed tower increased.

[0045] In contrast to this, in the handling device 100 according to Example 1, the random packing F did not invade the internal space 31 of the protruding portion 30 as in Comparative Examples 1 to 3, and the retention of the acrylic acid aqueous solution on the internal wall surface of the protruding portion 30 was prevented by wetting the internal wall surface of the protruding portion 30 with a liquid containing a polymerization inhibitor. As a result, no polymer was produced, and the device could be operated stably for one year.

[0046] In addition, in the handling device 100 according to Example 1, the liquid was sprayed from the nozzle 41 of the spray unit 40 at flow rates of 0.3, 0.4, 0.5, 0.6, 0.7, and 1.0 m 3 The state (wet state) of the inner wall surface of the protrusion 30 when sprayed at six different speeds of 0.3 m / h was confirmed. 3 In the case of / h, the flow rate was low and the liquid was not able to wet the entire inner wall surface of the protrusion 30. In particular, it was observed that a part of the inner surface Ln of the lid L was not wetted.

[0047] On the other hand, the flow rate is 0.7 and 1.0 m 3 At / h, the flow rate was too strong to uniformly wet the entire inner wall surface of the protrusion 30. In addition, since there is a concern that the water flow may cause physical corrosion, setting the flow rate too high is not preferable.

[0048] On the other hand, the flow rate is 0.4, 0.5, and 0.6 m 3 / h, 0.3m 3 The flow rate is not too low, such as 0.7m / h. 3 Therefore, in order to uniformly wet the entire inner wall surface of the protrusion 30 of the handling device 100, a flow rate of 0.4 to 0.6 m / h was required. 3 / h range (especially 0.5m 3It was confirmed that it is preferable to inject the liquid at a flow rate of 1 / h.

[0049] The present invention is not limited to the above-described embodiment, and various modifications are possible within the scope of the claims. Figures 5 to 7 show modified examples of the spray unit 40 of the handling device 100, with Figure 5 corresponding to Figure 4 and Figures 6 and 7 corresponding to Figure 2.

[0050] In the above description, it has been explained that one nozzle of the spray unit 40 is arranged so that the outlet 41 of the spray unit 40 faces upward in the height direction Z. However, the orientation and number of nozzles are not limited to those described above as long as the liquid can be sprayed throughout the internal space 31 of the protrusion 30. In addition to the above, multiple nozzles may be provided, as in the spray units 40a and 40b. Furthermore, the orientation of the outlet of the spray unit does not have to be along the height direction Z. For example, as shown in the spray units 40a and 40b in FIG. 5, the outlet may be configured to be tilted from the height direction Z with the first horizontal direction X (the direction in which the spray unit is inserted) as the axis of rotation.

[0051] In addition, as shown in FIG. 2, the spray unit 40 has been described as having an upward orientation of the nozzle nozzle 41 along the height direction Z when viewed from the second horizontal direction Y perpendicular to the first horizontal direction X and height direction Z of the nozzle. However, as long as the entire inner wall surface of the protrusion 30 can be uniformly wetted, the orientation of the nozzle nozzle is not limited to that shown in FIGS. 2 to 4 . In addition to the above, the spray unit 40c may have an orientation of the nozzle nozzle diagonally upward with respect to the second horizontal direction Y so as to face the lid L, as shown in FIG. 6. In this specification, "upward" refers to the orientation of the nozzle nozzle of the spray unit as long as it has a component along the height direction Z, as in vector decomposition. This includes not only the orientation of the nozzle nozzle along the height direction Z as shown in FIG. 2, but also the orientation of the nozzle nozzle diagonally upward as shown in FIG. 6. In addition, the spray unit 40d may have an orientation of the nozzle nozzle sideways, for example, by bending the piping midway so as to face the lid L, as shown in FIG. 7.

[0052] In addition, it has been described above that the grid 50 is detachable from the flow section 10 and the protruding section 30. However, as long as the random packing F packed in the packed bed of the flow section 10 can be prevented from entering the internal space 31, one embodiment also includes a case in which the grid 50 is not detachable but is integrally joined to at least one of the flow section 10 and the protruding section 30 by welding or the like.

[0053] Also, it has been explained that the protruding portion 30 is formed in a shape similar to the side surface of a cylinder. However, the shape of the protruding portion 30 is not limited to the shape of the side surface of a cylinder. In addition to the shape of the side surface of a cylinder, the shape of the protruding portion may be configured to have a slope that slopes toward the circulating portion 10 so that the liquid that has accumulated in the protruding portion 30 flows down into the circulating portion 10, or may be shaped to taper from the circulating portion 10 to the lid L.

[0054] Also, it has been described that the packed bed 17 is packed with random packing F. However, this is not limitative, and the packed bed may be packed with packing other than random packing.

[0055] The present invention encompasses the following aspects and configurations.

[0056] 1. A flow section that forms a flow path through which an easily polymerizable substance-containing material flows and that has a support member that can be filled with random packing in the flow path; a protruding portion provided on a side of the packed bed packed with the random packing in the flow section, protruding outward in a direction intersecting the flow direction of the easily polymerizable substance-containing material, the protruding portion forming an internal space and an opening portion communicating with the internal space and capable of being fitted with a lid for isolating the internal space from the outside; a spray unit that can be arranged in the internal space of the protrusion and that can spray a liquid onto an inner wall surface of the protrusion when arranged in the internal space; a grid disposed at the boundary between the flow path and the internal space, the grid preventing the random packing packed in the packed bed from moving into the internal space.

[0057] 2. The device for handling an easily polymerizable substance according to 1 above, wherein the mesh size of the grid is configured to be equal to or smaller than the size of the random packing.

[0058] 3. The device for handling an easily polymerizable substance according to 1. or 2. above, wherein the spray unit sprays liquid upward in the internal space of the protrusion.

[0059] 4. The device for handling an easily polymerizable substance according to any one of the above items 1 to 3, wherein the grid is detachable from the circulation section.

[0060] 5. The device for handling an easily polymerizable substance according to any one of 1. to 4. above, wherein the spray unit can be inserted into the internal space from the outside through the lid that closes the opening.

[0061] This application is based on Japanese Patent Application No. 2022-073001, filed on April 27, 2022, the disclosure of which is incorporated herein by reference in its entirety. [Explanation of symbols]

[0062] 10 Distribution Department, 11 flow paths, 17 packed bed, 20 support member, 21 hole, 22 filling presser, 23 Liquid distribution plate, 30 protrusion, 31 interior space, 32 openings, 40, 40a, 40b, 40c, 40d spray part, 50 grids, F irregular filling, L lid.

Claims

1. a flow section that forms a flow path through which a radically polymerizable monomer, which is an easily polymerizable substance, flows, and that has a support member that can be filled with random packing in the flow path; a protruding portion provided on a side of the packed bed packed with the random packing in the flow section, protruding outward in a direction intersecting the flow direction of the radical polymerizable monomer, the protruding portion forming an internal space and an opening communicating with the internal space and capable of being fitted with a lid for isolating the internal space from the outside; a spray unit that can be arranged in the internal space of the protrusion and that can spray a liquid onto an inner wall surface of the protrusion when arranged in the internal space; a grid disposed on a boundary between the flow path and the internal space, the grid preventing the random packing packed in the packed bed from moving into the internal space; The device for handling an easily polymerizable substance, wherein the spray unit can be inserted into the internal space from the side facing the packed bed with the grid therebetween.

2. 2. The device for handling an easily polymerizable substance according to claim 1, wherein the mesh size of said grid is equal to or smaller than the size of said random packing.

3. 3. The device for handling an easily polymerizable substance according to claim 1, wherein the spray unit sprays liquid upward in the internal space of the protruding portion.

4. 3. The device for handling an easily polymerizable substance according to claim 1, wherein the grid is detachable from the circulation section.

5. 3. The device for handling an easily polymerizable substance according to claim 1, wherein the spray unit can be inserted into the internal space from the outside through the lid that closes the opening.

6. 3. The device for handling an easily polymerizing substance according to claim 1, wherein the opening is a manhole provided in the protrusion through which an operator can enter, or a handhole through which an operator can insert his or her hand.

7. 4. The device for handling an easily polymerizable substance according to claim 3, wherein the spray unit sprays the liquid in a state where the grid prevents the random packing from entering the internal space.

8. 3. The device for handling an easily polymerizable substance according to claim 1, wherein the protrusion is for inspecting the internal space and the flow path through the opening.

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