A kind of production equipment of cyclic ester

Abstract

The present invention discloses a production device for cyclic esters, comprising: a barrel, provided with a material cavity, and provided with a material inlet, a melt outlet and at least one vacuum vent connected to the material cavity; a hollow shaft passing through the barrel along the material feeding direction, wherein a medium cavity is provided in the hollow shaft; a plurality of hollow disks arranged in the barrel along the feeding direction, and the hollow disks are arranged on the outer periphery of the hollow shaft, wherein a medium flow channel connected to the medium cavity is provided in the hollow disk, wherein at least part of the medium flow channel is spiral from outside to inside, and / or the medium flow channel includes a plurality of parallel medium sub-flow channels. In this way, after the hot medium enters the medium cavity, it will flow into the medium flow channel, and with the help of the medium flow channel, it will be more evenly distributed in the hollow disk, and the setting of the hollow disk can also increase shear and flow, so that the hollow shaft and the hollow disk cooperate with each other to achieve more even heating of the oligomer in the material cavity, so as to avoid carbonization and coking caused by uneven heating of the oligomer.

Description

Technical Field

[0001] The invention relates to the field of production equipment, and in particular to production equipment for cyclic esters. Background Art

[0002] Cyclic ester is an ester with a ring structure. Common cyclic esters include glycolide, lactide, vinylene carbonate, etc. Taking the production process of glycolide as an example, one of the synthetic routes of glycolide is the "two-step method". Specifically, the first step is to prepare polyglycolic acid (PGA) oligomers by polycondensation using glycolic acid or glycolate esters as raw materials, and the second step is to generate glycolide by cleavage and cyclization of PGA oligomers.

[0003] The most common method for cracking PGA oligomers is melt depolymerization. As the cracking reaction proceeds, the viscosity of the melt material continues to increase. If the material is heated unevenly, it is easy to cause carbonization and coking. The carbonization and coking phenomenon not only leads to low raw material conversion rate and low equipment heat transfer efficiency, but also easily leads to local overheating of materials after coking, which further causes coking. In severe cases, production needs to be interrupted and the reaction equipment needs to be cleaned, affecting the normal process of production. Therefore, it is urgent to improve the existing production equipment to improve the above problems. Summary of the invention

[0004] The present invention is made to solve the above-mentioned technical problems, and its purpose is to provide a production equipment for cyclic esters, which can solve the problem in the prior art that the cracking of PGA oligomers easily leads to carbonization and coking.

[0005] The present application discloses a production device for cyclic esters, comprising: a barrel, provided with a material cavity, and provided with a material inlet, a melt outlet and at least one vacuum vent connected to the material cavity; a hollow shaft passing through the barrel along the material feeding direction, wherein a medium cavity is provided in the hollow shaft; a plurality of hollow disks arranged in the barrel along the feeding direction, and the hollow disks are arranged on the outer periphery of the hollow shaft, and a medium flow channel connected to the medium cavity is provided in the hollow disk, and at least a part of the medium flow channel is spiral from the outside to the inside, and / or the medium flow channel includes a plurality of parallel medium sub-flow channels.

[0006] Optionally, the hollow disk includes a first disk, a second disk and a groove wall structure, all of which are arranged around the hollow shaft. The area defined between the first disk, the second disk and the hollow shaft is a receiving cavity. The groove wall structure is arranged in the receiving cavity, and the opposite sides of the groove wall structure are respectively fixed to the first disk and the second disk. The first disk, the second disk and the groove wall structure cooperate to form a medium flow channel.

[0007] Optionally, the hollow shaft has a flow channel inlet and a flow channel outlet both corresponding to the hollow disk; the medium flow channel includes an inner flow channel, at least one intermediate flow channel, an outer flow channel and a transition flow channel, the inner flow channel and the outer flow channel are arranged relative to each other in a direction away from the hollow shaft, and are connected through a transition flow channel, and the intermediate flow channel is arranged between the inner flow channel and the outer flow channel; the flow channel inlet, the inner flow channel, the transition flow channel, the outer flow channel, the intermediate flow channel and the flow channel outlet are connected in sequence.

[0008] Optionally, the groove wall structure includes N first partitions, which extend from the outer periphery of the hollow shaft to the outer periphery of the hollow disk and are connected to the outer periphery of the hollow disk. The N first partitions divide the medium flow channel into N+1 parallel medium sub-flow channels; wherein N is greater than or equal to 1; and the hollow shaft is provided with a flow channel inlet and a flow channel outlet corresponding to each medium sub-flow channel.

[0009] Optionally, the hollow disk also includes a pushing structure arranged at one end of the hollow disk away from the hollow axis, and the multiple pushing structures are spirally staggered in the feeding direction; the pushing structure has a base part and lateral extension parts located on both sides of the base part, the base part is respectively connected to the outer periphery of the first disk and the second disk, and the lateral extension part is formed by extending the base part toward the outside of the first disk and the second disk.

[0010] Optionally, a plurality of hollow disks are arranged relatively close to each other to form a disk group, and a plurality of disk groups are arranged along the feeding direction of the hollow shaft, and adjacent disk groups are arranged at intervals; along the feeding direction, the number of hollow disks in the disk group gradually decreases.

[0011] Optionally, multiple hollow disks in the same disk group are fixedly connected, and the first disk of the hollow disk on the first side of the disk group and the second disk of the hollow disk on the second side of the disk group are both welded and fixed to the hollow shaft, and are in contact with or spaced from the hollow shaft at the connection between adjacent hollow disks in the disk group; wherein the first side of the disk group and the second side of the disk group are two opposite sides of the disk group along the feed direction.

[0012] Optionally, a second partition is radially arranged in the hollow shaft, and the second partition divides the medium cavity into a first medium cavity and a second medium cavity which are arranged sequentially along the feeding direction; the first medium cavity includes a first feed cavity and a first discharge cavity, and the first feed cavity and the first discharge cavity are separated from each other by a conveying pipe or a layer plate; the second medium cavity includes a second feed cavity and a second discharge cavity, and the second feed cavity and the second discharge cavity are separated from each other by a conveying pipe or a layer plate.

[0013] Optionally, multiple jackets are provided on the outer circumference of the barrel, and in the feeding direction, at least one of the multiple jackets corresponds to the melt outlet, and / or, at the position corresponding to the melt outlet, the outer circumference of the hollow shaft is not provided with a hollow disk or the provided hollow disk is a fan-shaped disk.

[0014] Optionally, at least one liquid level adjustment plate is provided in the barrel; wherein, the liquid level adjustment plate can be movably inserted on the lower bottom of the barrel and can adjust the radial distance between the liquid level adjustment plate and the hollow shaft, and / or, a liquid level adjustment hole with adjustable opening size is provided on the liquid level adjustment plate.

[0015] The beneficial effects of the present invention are as follows:

[0016] The present invention discloses a production device for cyclic esters, comprising: a barrel provided with a material cavity, and provided with a material inlet, a melt outlet and at least one vacuum vent connected to the material cavity; a hollow shaft passing through the barrel along the material feeding direction, wherein a medium cavity is arranged in the hollow shaft; a plurality of hollow disks arranged in the barrel along the feeding direction, wherein the hollow disks are arranged on the outer periphery of the hollow shaft, wherein a medium flow channel connected to the medium cavity is arranged in the hollow disks, wherein at least a part of the medium flow channel is spiral from outside to inside, and / or the medium flow channel includes a plurality of parallel medium sub-flow channels.

[0017] In this way, after the hot medium enters the medium cavity, it will flow into the medium flow channel and be more evenly distributed in the hollow disk with the help of the medium flow channel. The setting of the hollow disk can also increase shear and flow. The hollow shaft and the hollow disk can cooperate with each other to achieve more uniform heating of the oligomers in the material cavity, so as to avoid carbonization and coking caused by uneven heating of the oligomers, thereby reducing the frequency of cleaning equipment and ensuring the orderly production of cyclic esters. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above features and advantages of the present invention can be better understood after reading the detailed description of the embodiments of the present disclosure in conjunction with the following drawings. In the drawings, the components are not necessarily drawn to scale, and components with similar related properties or features may have the same or similar reference numerals.

[0019] Figure 1 It is a structural schematic diagram of a production device according to an embodiment of the present invention;

[0020] Figure 2 yes Figure 1 A magnified view of point I;

[0021] Figure 3 It is a schematic structural diagram of a hollow disk according to an embodiment of the present invention;

[0022] Figure 4 This is an enlarged structural diagram of a hollow disk according to an embodiment of the present invention;

[0023] Figure 5 is an enlarged structural diagram of a hollow disk according to another embodiment of the present invention;

[0024] Figure 6 is a schematic diagram of a medium flow channel of a hollow disk according to an embodiment of the present invention;

[0025] Figure 7 is a schematic diagram of a medium flow channel of a hollow disk according to another embodiment of the present invention;

[0026] Figure 8 is a schematic diagram of a medium flow channel of a hollow disk according to another embodiment of the present invention;

[0027] Fig. 9 is an enlarged structural diagram of a hollow disk according to another embodiment of the present invention;

[0028] Fig.10 It is a schematic diagram of the layout position of the pusher structure of one embodiment of the present invention;

[0029] Fig.11 is a schematic structural diagram of a scraper according to an embodiment of the present invention;

[0030] Fig.12 is a schematic structural diagram of a scraper according to another embodiment of the present invention;

[0031] Fig.13 It is a schematic structural diagram of a hollow shaft according to an embodiment of the present invention;

[0032] Fig.14 is a schematic structural diagram of a hollow shaft according to another embodiment of the present invention;

[0033] Fig.15 It is a schematic structural diagram of a liquid level regulating plate according to an embodiment of the present invention.

[0034] Description of reference numerals:

[0035] 10-barrel,

[0036] 11-cylinder wall, 12-sealing plate,

[0037] 112- Melt outlet,

[0038] 101-Material chamber, 102-Vacuum vent,

[0039] 13- Jacket,

[0040] 14-Liquid level adjustment plate,

[0041] 15-Liquid baffle,

[0042] 16-Tie rod,

[0043] 20-Hollow shaft,

[0044] 201- medium cavity,

[0045] 211-flow channel inlet, 212-flow channel outlet,

[0046] 202-first medium chamber, 204-first material inlet chamber, 205-first material outlet chamber,

[0047] 203-second medium chamber, 206-second material inlet chamber, 207-second material outlet chamber,

[0048] 221-first inlet, 222-first outlet, 223-second inlet, 224-second outlet,

[0049] 21- Second partition,

[0050] 22-First layer board,

[0051] 23-Second layer board,

[0052] 24-Transport pipe,

[0053] 30-Hollow plate,

[0054] 301- medium flow channel,

[0055] 3011-inner flow channel, 3012-outer flow channel, 3013-transition flow channel, 3014-middle flow channel,

[0056] 31-first disc, 32-second disc, 33-groove wall structure, 35-first partition,

[0057] 36-push structure, 361-base part, 362-lateral extension part,

[0058] 302-accommodating chamber, 303-first accommodation chamber, 304-second accommodation chamber,

[0059] 305-medium sub-channel,

[0060] 3-disc group,

[0061] 306-main hollow plate, 307-auxiliary hollow plate,

[0062] 308-round plate, 309-sector plate,

[0063] 40-scraper,

[0064] 50-Weld. DETAILED DESCRIPTION

[0065] The present invention is further described below in conjunction with specific embodiments and drawings. More details are set forth in the following description to facilitate a full understanding of the present invention. However, the present invention can obviously be implemented in a variety of other ways different from the description herein. Those skilled in the art can make similar generalizations and deductions based on actual application situations without violating the connotation of the present invention. Therefore, the protection scope of the present invention should not be limited by the content of this specific embodiment.

[0066] It should be noted that these and other subsequent drawings are only examples, they are not drawn in proportion, and should not be used to limit the actual protection scope of the present invention. Figure 1 to Figure 15 The technical solution of the present invention is described.

[0067] like Figure 1 and Figure 2 As shown, the present invention discloses a production device for cyclic esters, which may be glycolide, lactide, vinylene carbonate, etc. The production device comprises a barrel 10, a hollow shaft 20 and a hollow disk 30. The barrel 10 comprises a barrel wall 11 and a sealing plate 12, the barrel wall 11 is a cylindrical structure with both ends open, the sealing plate 12 is arranged at the opening positions on both sides of the barrel wall 11, and the barrel wall 11 and the sealing plate 12 enclose a material chamber 101.

[0068] The barrel 10 is used for the entry of oligomers and the output of cyclic esters. Specifically, the barrel wall 11 of the barrel 10 is provided with an inlet (not shown in the figure) connected to the material cavity 101, a melt outlet 112 and at least one vacuum vent 102, wherein the inlet and the melt outlet 112 are arranged on the barrel wall 11 along the material feeding direction X, and the melt outlet 112 is usually arranged at the bottom of the barrel wall 11, while the vacuum vent 102 is arranged at the top of the barrel wall 11, and the vacuum vent 102 is used to evacuate the material cavity 101 to gradually increase the vacuum degree of the material cavity 101, and at the same time, the cyclic ester is evaporated. Taking the production process of glycolide as an example, the oligomer and other materials enter the barrel 10 through the inlet, and are heated in the barrel 10 to undergo a cracking reaction to generate glycolide, and then the glycolide escapes from the vacuum vent 102 in a gas phase, and the residue flows out from the melt outlet 112.

[0069] The sealing plate 12 is provided with through holes, and the hollow shaft 20 passes through one of the through holes into the material chamber 101 and passes through another through hole. A bearing sleeve can be provided at the through hole position to ensure the smooth rotation of the hollow shaft 20. An organic seal structure (not shown in the figure) is also provided between the hollow shaft 20 and the through hole of the sealing plate 12 to ensure sealing. Figure 3 A medium cavity 201 is provided in the hollow shaft 20, and a heat medium such as hot oil is introduced into the medium cavity 201. The heat medium can transfer heat to the material cavity 101 to heat the oligomer in the material cavity 101, thereby generating glycolide.

[0070] A plurality of hollow disks 30 are arranged in the barrel 10 along the feeding direction X, and the hollow disks 30 are arranged on the outer periphery of the hollow shaft 20. The thickness of a single hollow disk 30 is between 2 mm and 15 mm, preferably between 3 mm and 8 mm, to ensure sufficient strength.

[0071] Please continue to refer to Figure 6, a medium flow channel 301 connected to the medium cavity 201 is provided in the hollow disk 30, and at least part of the medium flow channel 301 is spiral from outside to inside, so that after the heat medium in the medium cavity 201 flows into the medium flow channel 301, it can flow from the outside of the hollow disk 30 to the inside of the hollow disk 30 in a spiral shape along the medium flow channel 301 and flow back to the medium cavity 201, so that the heat medium is more evenly distributed in the hollow disk 30 with the help of the medium flow channel 301. Or as Figure 8 As shown, the medium flow channel 301 includes a plurality of parallel medium sub-flow channels 305. After the hot medium in the medium cavity 201 flows into the hollow disk 30, it flows along the plurality of parallel medium sub-flow channels 305 in the hollow disk 30 and flows back to the medium cavity 201, and can also be distributed relatively evenly. Figure 7 As shown, the medium flow channel 301 includes a plurality of parallel medium sub-flow channels 305, each of which is at least partially spiral from outside to inside. When the heat medium flows along the plurality of parallel medium sub-flow channels 305 in the hollow disk 30, it can flow in a spiral from the outside of the hollow disk 30 to the inside of the hollow disk 30 in each medium sub-flow channel 305 and flow back to the medium cavity 201.

[0072] It should also be noted that the hollow disk 30 can also increase shear and flow. It can be seen that the hollow shaft 20 and the hollow disk 30 can cooperate with each other to achieve relatively uniform heating of the oligomers in the material chamber 101, so as to avoid carbonization and coking caused by uneven heating of the oligomers, thereby reducing the frequency of cleaning equipment and ensuring the orderly production of cyclic esters.

[0073] The following is a further introduction to the hollow plate 30:

[0074] like Figure 3 to Figure 6 In this embodiment, the hollow disk 30 includes a first disk 31, a second disk 32 and a groove wall structure 33, and the first disk 31, the second disk 32 and the groove wall structure 33 are all arranged around the outer periphery of the hollow shaft 20, and the area defined between the first disk 31, the second disk 32 and the hollow shaft 20 is the receiving cavity 302, for example, the first disk 31 and the second disk 32 are both inclined, and the inner periphery of the first disk 31 and the second disk 32 is sleeved with the hollow shaft 20, and the outer peripheries of the first disk 31 and the second disk 32 are mutually inclined and connected, so that the receiving cavity 302 is an annular chamber with a triangular cross-section.

[0075] The groove wall structure 33 is disposed in the receiving cavity 302 , and opposite sides of the groove wall structure 33 are fixed to the first disc 31 and the second disc 32 respectively. The first disc 31 , the second disc 32 and the groove wall structure 33 cooperate to form a medium flow channel 301 .

[0076] Specifically, the groove wall structure 33 includes a groove side wall and a bottom plate, and the bottom plate of the groove wall structure 33 divides the receiving cavity 302 into a first receiving cavity 303 and a second receiving cavity 304, wherein the area defined by the first disc 31, the bottom plate and the hollow shaft 20 is the first receiving cavity 303, and the area defined by the second disc 32, the bottom plate and the hollow shaft 20 is the second receiving cavity 304.

[0077] The chassis of the groove wall structure 33 has a first surface facing the first disc 31 and a second surface facing the second disc 32, and the groove side walls are respectively arranged on the first surface and the second surface of the chassis. The groove side walls located in the first receiving cavity 303 are respectively connected to the first disc 31 and the chassis on two opposite sides, so that the medium flow channel 301 is surrounded by the first disc 31, the groove side walls and the chassis; and the groove side walls located in the second receiving cavity 304 are respectively connected to the second disc 32 and the chassis on two opposite sides, so that the medium flow channel 301 is surrounded by the second disc 32, the groove side walls and the chassis. Further, the chassis can be set as a solid disc structure, so that the medium flow channel 301 in the first receiving cavity 303 and the medium flow channel 301 in the second receiving cavity 304 are not connected to each other; the chassis can also be provided with a hollow structure to achieve weight reduction, so that the medium flow channel 301 in the first receiving cavity 303 and the medium flow channel 301 in the second receiving cavity 304 are connected to each other.

[0078] like Figure 6 As shown, the hollow shaft 20 is provided with a flow channel inlet 211 and a flow channel outlet 212 , both of which are connected to the medium cavity 201 , and both of which are provided corresponding to the hollow disk 30 .

[0079] In one embodiment, the medium flow channel 301 includes an inner flow channel 3011, an outer flow channel 3012, at least one intermediate flow channel 3014 and a transition flow channel 3013, wherein the inner flow channel 3011, the intermediate flow channel 3014 and the outer flow channel 3012 are all flow channels extending along an arc path and are arranged around the circumference of the hollow shaft 20, while the transition flow channel 3013 extends along the radial direction of the hollow shaft 20. The inner flow channel 3011 and the outer flow channel 3012 are arranged opposite to each other in a direction away from the hollow shaft 20, and the inner flow channel 3011 and the outer flow channel 3012 are connected through the transition flow channel 3013, and the intermediate flow channel 3014 is arranged between the inner flow channel 3011 and the outer flow channel 3012.

[0080] The flow channel inlet 211 extends into the inner flow channel 3011, and the flow channel outlet 212 extends into the middle flow channel 3014 adjacent to the inner flow channel 3011. In this way, the flow channel inlet 211, the inner flow channel 3011, the transition flow channel 3013, the outer flow channel 3012, the middle flow channel 3014 and the flow channel outlet 212 are connected in sequence. After the heat medium in the medium cavity 201 flows into the hollow disk 30 through the flow channel inlet 211, it will flow into the inner flow channel 3011, the transition flow channel 3013, the outer flow channel 3012 and the middle flow channel 3014 in sequence, and then flow back into the medium cavity 201 through the flow channel outlet 212, so that the heat medium is more evenly distributed in the hollow disk 30, and better achieves uniform heating of the oligomer in the material cavity 101.

[0081] Furthermore, the flow channel inlet 211 and the flow channel outlet 212 may be optionally connected to a rotary joint for the inlet and outlet of the heat medium.

[0082] Furthermore, a plurality of intermediate flow channels 3014 are provided in a direction away from the hollow shaft 20 , and the plurality of intermediate flow channels 3014 are connected in sequence, for example, three or four intermediate flow channels 3014 are provided, so as to further improve the uniformity of the distribution of the heat medium in the hollow disk 30 .

[0083] Furthermore, if Figure 7 As shown, the groove wall structure 33 also includes N first baffles 35, which extend from the hollow shaft 20 along the outer periphery of the hollow disk 30 and are connected to the outer periphery of the hollow disk 30, so as to divide the receiving cavity 302 of the hollow disk 30 into N+1 flow channel arrangement areas around the hollow shaft 20, and divide the medium flow channel 301 into N+1 medium sub-flow channels 305; wherein N is a positive integer greater than or equal to 1. The flow channel arrangement areas are distributed in a fan shape, and the medium sub-flow channels 305 are arranged in the flow channel arrangement areas one by one.

[0084] Correspondingly, the hollow shaft 20 is provided with a flow channel inlet 211 and a flow channel outlet 212 corresponding to each medium sub-flow channel 305 , so that the medium sub-flow channels 305 can be parallel medium sub-flow channels 305 , further improving the uniformity of the heat medium in the hollow disk 30 .

[0085] Furthermore, if Figure 4 and Figure 7 As shown, the first partition 35 located in the first receiving cavity 303 has two opposite sides respectively connected to the first disc 31 and the bottom plate of the groove wall structure 33, so as to separate the medium flow channel 301 located in the first receiving cavity 303 into a plurality of medium sub-flow channels 305; the first partition 35 located in the second receiving cavity 304 has two opposite sides respectively connected to the second disc 32 and the bottom plate, so as to separate the medium flow channel 301 located in the second receiving cavity 304 into a plurality of medium sub-flow channels 305, so as to further improve the uniformity of the distribution of the heat medium.

[0086] Figure 8 Schematic diagram of the medium flow channel of the hollow disk in another embodiment. Similarly, the groove wall structure 33 in the hollow disk 30 includes a groove side wall, a bottom plate and N first baffles 35. The specific configuration of the bottom plate and the first baffles 35 is the same as that in the above embodiment and will not be repeated. The difference is that the medium flow channel 301 in this embodiment only includes N+1 parallel medium sub-flow channels 305, wherein the groove side wall extends from the hollow shaft 20 along the outer periphery of the hollow disk 30 and is at a certain distance from the outer periphery of the hollow disk 30 to form a channel connecting the flow channel inlet 211 and the flow channel outlet 212 in the same medium sub-flow channel 305.

[0087] Alternatively, if Figure 1 and Figure 3 As shown, a plurality of hollow disks 30 are arranged along the feeding direction X, and a plurality of hollow disks 30 are arranged relatively close to each other to form a disk group 3. The hollow shaft 20 is provided with a plurality of disk groups 3 along the feeding direction X, and adjacent disk groups 3 are arranged at intervals. The inner circumferences of adjacent hollow disks 30 in the disk group 3 are connected to each other. Along the feeding direction X, the number of hollow disks 30 in each disk group 3 gradually decreases.

[0088] During the cracking reaction of the oligomer, the viscosity of the material near the feed end in the barrel 10 is relatively low, so the layout of the hollow disks 30 can be denser, for example, the hollow disks 30 in the disk group 3 can be arranged in groups of 3 to 7, so as to drive the oligomer, facilitate film formation, and accelerate the formation rate of the monomer; and as the oligomer is gradually cracked to form glycolide, the farther away from the feed end, the higher the viscosity of the material in the barrel 10, and the higher the viscosity, the easier it is to form a film. Therefore, the farther away from the feed end, the sparser the layout of the hollow disks 30 can be, for example, the hollow disks 30 in the disk group 3 can be arranged in groups of 1 to 3, so as to increase the heat transfer efficiency.

[0089] Optionally, the inner periphery of the first disc 31 and the inner periphery of the second disc 32 in the hollow disc 30 can be welded to the hollow disc 30 to form an annular weld 50. In order to keep the disc assembly 3 flexible and reduce the welding difficulty, the embodiment of the present invention adopts the following method:

[0090] like Figure 4 As shown, multiple hollow disks 30 in the same disk group 3 are fixedly connected to each other, and the first disk 31 of the hollow disk 30 on the first side of the disk group 3 and the second disk 32 of the hollow disk 30 on the second side of the disk group 3 are both welded and fixed to the hollow shaft 20, and a weld 50 is formed at the intersection; wherein the first disk 31 and the second disk 32 are arranged in sequence along the feed direction X, and the first side of the disk group 3 and the second side of the disk group 3 are two opposite sides of the disk group 3 along the feed direction X.

[0091] The connection between adjacent hollow disks 30 in the disk group 3 is in contact with or spaced from the hollow shaft 20. The connection between adjacent hollow disks 30 is the connection position between the inner periphery of the first disk 31 of one of the adjacent hollow disks 30 and the inner periphery of the second disk 32 of the other adjacent hollow disk 30.

[0092] In this way, on the first aspect, only the weld 50 is formed at the intersection of the two opposite sides of the disk group 3 and the hollow shaft 20, and other positions are not connected to the hollow shaft 20, thereby ensuring the sealing between the disk group 3 and the hollow shaft 20 while reducing the welding points and reducing the welding difficulty; on the second aspect, since the connection positions between the hollow shaft 20 are reduced, the multiple hollow disks 30 in the disk group 3 have a certain flexibility to reduce the stress generated by the hollow disks 30.

[0093] Alternatively, if Figure 4 As shown, the chassis of each groove wall structure 33 in the disk group 3 has its outer periphery connected to the outer periphery of the first disk 31 and the outer periphery of the second disk 32 respectively, and its inner periphery is in contact with or spaced from the hollow shaft 20, that is, only the two opposite sides of the disk group 3 are formed with the hollow shaft 20 to allow the disk group 3 to maintain a certain flexibility.

[0094] In other optional embodiments, such as Figure 5 As shown, the outer peripheries of the chassis in the disk group 3 are respectively in contact with or spaced from the outer peripheries of the first disk 31 and the second disk 32, and the inner peripheries are welded to the hollow shaft 20, that is, a weld 50 is formed between the two opposite sides of the disk group 3 and the hollow shaft 20, and a weld 50 is formed between the chassis and the hollow shaft 20, so that the disk group 3 maintains a certain flexibility.

[0095] Of course, the inner periphery of the chassis may also be welded with the hollow shaft 20, and the outer periphery of the chassis may be respectively connected to the outer periphery of the first disc 31 and the outer periphery of the second disc 32, which will not be described in detail here.

[0096] Combine the following Fig. 9 , Fig.10 The structure of the empty tray 30 in other embodiments of the present invention is introduced. Figure 3 to Figure 5 The structure of the hollow disk 30 is different as follows:

[0097] The hollow disk 30 further includes a pusher structure 36 disposed at one end of the hollow disk 30 away from the hollow shaft 20. The pusher structure 36 may be a solid body or may be hollow inside. The first disk 31 and the second disk 32 are disposed opposite to each other, such as being parallel to each other or forming an angle. The pusher structure 36 connects the ends of the first disk 31 and the second disk 32 respectively. The pusher structure 36, the first disk 31, the second disk 32 and the hollow shaft 20 form a receiving cavity 302.

[0098] The pusher structure 36 has a base portion 361 and a lateral extension portion 362, the base portion 361 is connected to the outer periphery of the first disc 31 and the outer periphery of the second disc 32 respectively, and the lateral extension portion 362 is formed by extending the base portion 361 to the outer sides of the first disc 31 and the second disc 32 to stagger the area between the end of the first disc 31 and the end of the second disc 32. The medium flow channel 301 can extend into the pusher structure 36, or the medium flow channel 301 does not extend into the pusher structure 36. By setting the pusher structure 36, the material can be pushed forward, while improving the film spreading efficiency and enhancing the stirring effect on the material.

[0099] Furthermore, if Fig.10 As shown, multiple pusher structures 36 are arranged in a spiral staggered manner in the feed direction X. The spiral layout makes the material closer to the plug flow. There is no mixing of the material in the flow direction, and complete mixing is achieved in the radial direction. Therefore, the flow rate is uniform in the cross section perpendicular to the flow direction.

[0100] Fig. 9 , Fig.10 The hollow disks 30 shown can also form a disk group 3. Specifically, the spacing between adjacent hollow disks 30 in the same disk group 3 is smaller than the spacing between adjacent disk groups 3. It can be understood that along the feed direction X, when the length of the pushing structure 36 is greater than the maximum width between the first disk 31 and the second disk 32, the first disk 31 and the second disk 32 of each hollow disk 30 in the same disk group are welded to the hollow shaft 20.

[0101] The following are other accessories in the production equipment:

[0102] like Fig.11 As shown, the production equipment further includes a plurality of scrapers 40, which are fixed to the barrel 10 and extend into the material chamber 101, and one scraper 40 corresponds to the outer surface of at least one hollow disk 30. Here, the correspondence means that a gap is reserved between the outer surface of the hollow disk 30 and / or the outer peripheral surface of the hollow shaft 20 and the blade of the scraper 40. For example, the outer surface of a hollow disk 30 and the outer peripheral surface of the hollow shaft 20 correspond to the scraper 40, or the opposite outer surfaces of two adjacent hollow disks 30 correspond to the scraper 40, or only the outer peripheral surface of the hollow shaft 20 corresponds to the scraper 40.

[0103] The scraper 40 can adopt a fixed blade type, hinge type or spring type structure. During the rotation of the hollow shaft 20, the setting of the scraper 40 can clean up excessive carbides accumulated on the surface of the hollow disk 30 and / or the hollow shaft 20 to prevent carbide accumulation from affecting production.

[0104] The scraper 40 can also be used Fig.12Specifically, the hollow disk 30 includes a main hollow disk 306 and an auxiliary hollow disk 307, the surface area of ​​the auxiliary hollow disk 307 is smaller than the surface area of ​​the main hollow disk 306, one auxiliary hollow disk 307 corresponds to one main hollow disk 306, the two are arranged at intervals, and are defined as the same group; further, the ends of the main hollow disk 306 and the ends of the auxiliary hollow disk 307 of the same group are provided with a pusher structure 36 at the same position, and the pusher structures 36 of the multiple groups of hollow disks are arranged in a spiral staggered manner in the feeding direction X. The scraper 40 is located in the gap between the main hollow disk 306 and the auxiliary hollow disk 307 of the same group to clean the carbides on the two opposite surfaces of the main hollow disk 306 and the auxiliary hollow disk 307; the scraper 40 is provided with a bending structure to adapt to the pushing structure 36 on the main hollow disk 306; at the same time, since the main hollow disk 306 and the auxiliary hollow disk 307 are of different sizes, the scraper 40 is provided with a groove on the side facing the auxiliary hollow disk 307 to accommodate the pushing structure 36 of the auxiliary hollow disk 307.

[0105] The hollow shaft 20 is further described below:

[0106] In some embodiments, Fig.13 This is a structural diagram of a hollow shaft according to an embodiment of the present invention. As shown in the figure, a second partition plate 21, a first layer plate 22 and a second layer plate 23 are radially arranged in the hollow shaft 20. The second partition plate 21 divides the medium cavity 201 into a first medium cavity 202 and a second medium cavity 203 which are sequentially arranged along the feed direction X.

[0107] The first layer plate 22 is arranged in the first medium cavity 202 along the feeding direction X, and divides the first medium cavity 202 into a first feeding cavity 204 and a first discharging cavity 205, and the first feeding cavity 204 and the first discharging cavity 205 are indirectly connected. The second layer plate 23 is arranged in the second medium cavity 203 along the feeding direction X, and divides the second medium cavity 203 into a second feeding cavity 206 and a second discharging cavity 207, and the second feeding cavity 206 and the second discharging cavity 207 are indirectly connected.

[0108] Continue to refer Figure 6 and Fig.13 The first end of the hollow shaft 20 extends out of the barrel 10 and is arranged near the first medium chamber 202. Two quick connectors are arranged at the first end of the hollow shaft 20, one of which is connected to the first inlet 221, and the other is connected to the first outlet 222. The medium enters the first feeding chamber 204 through the first inlet 221, and then enters the medium flow channel 301 through the flow channel inlet 211. After being evenly distributed in the hollow disk 30 through the medium flow channel 301, the medium enters the first discharging chamber 205 through the flow channel outlet 212 and flows out from the first outlet 222.

[0109] Similarly, the second end of the hollow shaft 20 extends out of the barrel 10 and is arranged near the second medium chamber 203. Two quick connectors are arranged at the second end of the hollow shaft 20, one of which is connected to the second inlet 223, and the other is connected to the second outlet 224. The medium enters the second inlet chamber 206 through the second inlet 223, and then enters the medium flow channel 301 through the flow channel inlet 211. After being evenly distributed in the hollow disk 30 through the medium flow channel 301, the medium enters the second outlet chamber 207 through the flow channel outlet 212 and flows out from the second outlet 224.

[0110] Thus, in the first aspect, the temperature of the first medium cavity 202 and the second medium cavity 203 can be controlled separately. Specifically, the viscosity of the material near the feed end is relatively low, so the temperature of the medium introduced into the first medium cavity 202 can be appropriately lowered to fully heat the material in the front half of the hollow shaft 20 and slow down the coking; while the viscosity of the material near the discharge end is relatively high, so the temperature of the medium introduced into the second medium cavity 203 can be appropriately increased, which is conducive to the formation of cyclic esters and ensures the orderly production. In the second aspect, different media can be introduced into the first medium cavity 202 and the second medium cavity 203 according to the heating temperature and properties of the medium to ensure that the medium flows evenly and effectively in the hollow shaft 20.

[0111] Fig.14 2 is a structural diagram of a hollow shaft according to another embodiment of the present invention. Similarly, a second partition plate 21 is radially arranged in the inner part of the hollow shaft 20. The second partition plate 21 divides the medium cavity 201 into a first medium cavity 202 and a second medium cavity 203 arranged in sequence along the feeding direction X. A delivery pipe 24 is also arranged in the hollow shaft 20, and the delivery pipe 24 passes through the medium cavity 201. The first medium cavity 202 is divided into a first feed cavity 204 and a first discharge cavity 205 by the delivery pipe 24, wherein the first feed cavity 204 is located in the delivery pipe 24, and the first discharge cavity 205 is an interlayer between the hollow shaft 20 and the delivery pipe 24. The second medium cavity 203 is divided into a second feed cavity 206 and a second discharge cavity 207 by the delivery pipe 24, wherein the second feed cavity 206 is located in the delivery pipe 24, and the second discharge cavity 207 is an interlayer between the hollow shaft 20 and the delivery pipe 24.

[0112] Fig.14 The hollow shaft is suitable for the case where there are multiple medium sub-channels 305. Specifically, continue to refer to Figure 7 , Figure 8 and Fig.14After the medium enters the first feed cavity 204 of the conveying pipe 24, it will enter the medium flow channel 301 through the flow channel inlet 211, that is, each medium sub-flow channel 305, and then flow into the first discharge cavity 205 through the flow channel outlet 212, that is, the interlayer between the hollow shaft 20 and the conveying pipe 24; similarly, after the medium enters the second feed cavity 206 of the conveying pipe 24, it will enter the medium flow channel 301 through the flow channel inlet 211, and then flow into the second discharge cavity 207 through the flow channel outlet 212, that is, the interlayer between the hollow shaft 20 and the conveying pipe 24.

[0113] It can be understood that the interlayer between the hollow shaft 20 and the conveying pipe 24 can also be a feed cavity, and the discharge cavity is located in the conveying pipe 24. Correspondingly, the flow channel inlet 211 is set on the hollow shaft 20, and the flow channel outlet 212 extends from the hollow shaft 20 into the conveying pipe 24. After the medium enters the feed cavity, that is, the interlayer between the hollow shaft 20 and the conveying pipe 24, it will enter the medium flow channel 301 through the flow channel inlet 211, and then flow into the conveying pipe 24 through the flow channel outlet 212.

[0114] The structure of the barrel 10 is further described below:

[0115] Multiple vacuum vents 102 can be arranged along the feeding direction X, and at least one vacuum vent 102 is arranged in the pre-reaction section, and at least one vacuum vent 102 is arranged in the final reaction section, so as to accelerate the removal of gas phase products such as glycolide from the production device.

[0116] Furthermore, a gas-liquid separation plate can be provided at the entrance of the vacuum vent 102 to separate the entrained polymer, and the gas-liquid separation plate can be a flat plate, an arc plate, a conical plate or other structures. A heat medium jacket can be provided on the gas-liquid separation plate to maintain the temperature of the gas-liquid separation plate. Furthermore, the hollow shaft 20 is horizontally eccentrically arranged in the barrel 10, and the distance between the hollow shaft 20 and the top of the barrel wall 11 is greater than the distance between the hollow shaft 20 and the bottom of the barrel wall 11, so that there is a gas-liquid separation space between the vacuum vent 102 and the hollow disk 30 and the material, thereby reducing the gas-liquid entrainment in the product.

[0117] Alternatively, if Figure 1 and Figure 2 As shown, a jacket 13 is provided on the outer circumference of the barrel 10. The jacket 13 can maintain the temperature inside the barrel 10, and more effectively ensure the cracking reaction of the oligomer in the barrel 10.

[0118] Furthermore, multiple jackets 13 are arranged in sequence along the feed direction X. In the feed direction X, at least one of the multiple jackets 13 corresponds to the melt discharge port 112, and the jackets 13 are independent of each other to perform zoned temperature control on the corresponding areas. For example, the temperature of the pre-reaction section of the barrel 10 can be lowered to slow down coking, and the temperature of the post-reaction section of the barrel 10 can be increased to facilitate the production of glycolide.

[0119] In a more specific embodiment, in order to facilitate the discharge of the molten material from the melt outlet 112, the hollow plate 30 may not be provided at the melt outlet 112 of the barrel 10, and the temperature is only controlled by the jacket 13 separately provided at the rear end, and the specific method is as follows:

[0120] At the position corresponding to the melt discharge port 112, the hollow disk 30 is not set on the outer periphery of the hollow shaft 20, and the area corresponding to the melt discharge port 112 is not heated by the hollow disk 30, and the jacket 13 corresponding to the position of the melt discharge port 112 is independently temperature-controlled to prevent abnormalities such as coking at the discharge position.

[0121] In some other optional embodiments, the hollow disk 30 disposed at the position of the hollow shaft 20 corresponding to the melt outlet 112 is a fan-shaped disk 309, as follows:

[0122] Combination Figure 1 and Figure 2 As shown, several hollow disks 30 include a circular disk 308 and a fan-shaped disk 309, and the curvature of the fan-shaped disk 309 is smaller than that of the circular disk 308; for example, the circular disk 308 is a full ring, while the fan-shaped disk 309 is a half ring of 180°, or a fan-shaped ring of 240°, 120°, etc. The setting area where the fan-shaped disk 309 is located corresponds to the melt discharge port 112 along the radial direction of the hollow shaft 20. Compared with the circular disk 308, the fan-shaped disk 309 has weaker stirring force on the material and does not affect the discharge of the melt material from the melt discharge port 112. In this way, the material in the area near the melt discharge port 112 can be heated by the fan-shaped disk 309, and also abnormalities such as coking at the discharge position can be prevented.

[0123] Optionally, at least one liquid level regulating plate 14 is provided in the barrel 10 along the feeding direction X, and the liquid level regulating plate 14 can be movably inserted in the lower bottom of the barrel 10, and can adjust the radial distance between the hollow shaft 20, so that the liquid level of different reaction sections in the barrel 10 can be adjusted. Specifically, the viscosity of the material in the front section of the reaction of the barrel 10 is relatively low, so the liquid level of the front section of the reaction can be increased by the liquid level regulating plate 14 to better drive the material, which is beneficial to the reaction. The viscosity of the rear section of the reaction of the barrel 10 is relatively high, so the liquid level of the rear section of the reaction can be lowered by the liquid level regulating plate 14 to prevent coking. For example, two liquid level regulating plates 14 are provided to divide the interior of the barrel 10 into a high liquid level section, a middle liquid level section and a low liquid level section in sequence along the feeding direction X, so as to better correspond the liquid level of the material and the viscosity of the material, which is beneficial to the reaction of the material.

[0124] In some other optional embodiments, the liquid level adjustment plate 14 can be Fig.15 In the structure shown, specifically, a liquid level regulating hole is provided on the liquid level regulating plate 14, and the opening size of the liquid level regulating hole is adjustable.

[0125] Specifically, the liquid level adjustment plate 14 is movably connected to the liquid baffle plate 15 at the liquid level adjustment hole, and the liquid baffle plate 15 is connected to the pull rod 16, and the pull rod 16 extends in a direction away from the liquid baffle plate 15 to be movably penetrated on the barrel 10. By pulling the pull rod 16, the liquid baffle plate 15 can be driven to move to adjust the opening size of the liquid level adjustment hole, thereby adjusting the liquid level height of the corresponding reaction section in the barrel 10.

[0126] Although the present invention is disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications without departing from the spirit and scope of the present invention. Therefore, any modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope defined by the claims of the present invention.

Claims

1. A cyclic ester production device, characterized in that: include: A barrel (10) is provided with a material cavity (101), and is provided with a material inlet connected to the material cavity (101), a melt outlet (112), and at least one vacuum vent (102); A hollow shaft (20) passing through the barrel (10) along a material feeding direction X, wherein a medium cavity (201) is provided in the hollow shaft (20); A plurality of hollow disks (30) are arranged in the barrel (10) along the feeding direction (X), and the hollow disks (30) are arranged on the outer periphery of the hollow shaft (20). The hollow disk (30) comprises a first disk (31), a second disk (32) and a groove wall structure (33) which are all arranged around the hollow shaft (20); an area defined between the first disk (31), the second disk (32) and the hollow shaft (20) is a receiving cavity (302); the groove wall structure (33) is arranged in the receiving cavity (302); opposite sides of the groove wall structure (33) are respectively fixed to the first disk (31) and the second disk (32); the first disk (31), the second disk (32) and the groove wall structure (33) cooperate to form a medium flow channel (301); the medium flow channel (301) is connected to the medium cavity (201); at least a portion of the medium flow channel (301) is spiral from outside to inside, and / or the medium flow channel (301) comprises a plurality of parallel medium sub-flow channels (305); The hollow shaft (20) has a flow channel inlet (211) and a flow channel outlet (212) both arranged corresponding to the hollow disk (30); When at least part of the medium flow channel (301) is spiral from outside to inside, the medium flow channel (301) comprises an inner flow channel (3011), at least one intermediate flow channel (3014), an outer flow channel (3012) and a transition flow channel (3013); the inner flow channel (3011) and the outer flow channel (3012) are arranged opposite to each other in a direction away from the hollow shaft (20) and are connected through the transition flow channel (3013); the intermediate flow channel (3014) is arranged between the inner flow channel (3011) and the outer flow channel (3012); the flow channel inlet (211), the inner flow channel (3011), the transition flow channel (3013), the outer flow channel (3012), the intermediate flow channel (3014) and the flow channel outlet (212) are connected in sequence; When the medium flow channel (301) includes a plurality of parallel medium sub-flow channels (305), the groove wall structure (33) includes N first partitions (35), the first partitions (35) extending from the outer periphery of the hollow shaft (20) to the outer periphery of the hollow disk (30) and connected to the outer periphery of the hollow disk (30), the N first partitions (35) dividing the medium flow channel (301) into N+1 parallel medium sub-flow channels; wherein N is greater than or equal to 1; and the hollow shaft (20) is provided with a flow channel inlet (211) and a flow channel outlet (212) corresponding to each of the medium sub-flow channels.

2. The production equipment according to claim 1, characterized in that: The hollow disk (30) further comprises a pushing structure (36) arranged at one end of the hollow disk (30) away from the hollow shaft (20), wherein a plurality of the pushing structures (36) are staggeredly arranged in a spiral shape in the feeding direction (X); The pusher structure (36) comprises a base portion (361) and lateral extension portions (362) located on both sides of the base portion, the base portion (361) being connected to the outer peripheries of the first disc (31) and the second disc (32) respectively, and the lateral extension portions (362) being formed by extending the base portion (361) toward the outer sides of the first disc (31) and the second disc (32).

3. The production equipment according to claim 1 or 2, characterized in that: A plurality of the hollow disks (30) are arranged relatively close to each other to form a disk group (3); the hollow shaft (20) is provided with a plurality of groups of the disk groups (3) along the feeding direction (X), and adjacent disk groups (3) are arranged at intervals; Along the feeding direction (X), the number of the hollow disks (30) in the disk group (3) gradually decreases.

4. The production equipment according to claim 3, characterized in that: A plurality of hollow disks (30) in the same disk group (3) are fixedly connected, and a first disk (31) of the hollow disk (30) located on a first side of the disk group (3) and a second disk (32) of the hollow disk (30) located on a second side of the disk group (3) are both welded and fixed to the hollow shaft (20), and are located at the connection between adjacent hollow disks (30) in the disk group (3) and are in contact with or spaced from the hollow shaft (20); wherein the first side of the disk group (3) and the second side of the disk group (3) are two opposite sides of the disk group (3) along the feed direction (X).

5. The production equipment according to claim 1 or 2, characterized in that: A second partition plate (21) is radially disposed inside the hollow shaft (20), the second partition plate (21) dividing the medium cavity (201) into a first medium cavity (202) and a second medium cavity (203) which are sequentially disposed along the feeding direction (X); The first medium chamber (202) comprises a first material input chamber (204) and a first material output chamber (205), and the first material input chamber (204) and the first material output chamber (205) are separated from each other by a conveying pipe (24) or a layer plate; The second medium chamber (203) comprises a second material inlet chamber (206) and a second material outlet chamber (207), and the second material inlet chamber (206) and the second material outlet chamber (207) are separated from each other by a conveying pipe (24) or a layer plate.

6. The production equipment according to claim 1 or 2, characterized in that: A plurality of jackets (13) are provided on the outer circumferential surface of the barrel (10), and in the feeding direction (X), at least one of the plurality of jackets (13) corresponds to the melt outlet (112), and / or, At a position corresponding to the melt discharge port (112), the outer periphery of the hollow shaft (20) is not provided with the hollow disk (30) or the provided hollow disk (30) is a fan-shaped disk.

7. The production equipment according to claim 1 or 2, characterized in that: At least one liquid level adjustment plate (14) is provided in the barrel (10); wherein: The liquid level adjustment plate (14) is movably inserted on the lower bottom of the barrel (10) and is capable of adjusting the radial distance between the liquid level adjustment plate (14) and the hollow shaft (20), and / or, The liquid level regulating plate (14) is provided with a liquid level regulating hole with an adjustable opening size.

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