Reverse material distribution type synthesizer applied to processing of propylene carbonate production line

Abstract

The invention discloses a reverse material distribution type synthesizer applied to processing of a propylene carbonate production line. The reverse material distribution type synthesizer comprises a synthesis tank as well as a disc type material distribution mechanism and a synthesis hopper which are vertically distributed in the synthesis tank, according to the disc type material distribution mechanism, the material distribution cover and the material distribution discs which are installed in the material distribution cover and are driven to rotate in the up-down opposite directions are arranged, during material distribution, raw materials are annularly and radially distributed into the uppermost material distribution cavity through the upper spiral conveying piece, and the multiple material distribution discs which rotate in the up-down opposite directions sequentially circulate from top to bottom; under the multiple actions of gravity, centrifugal force and reverse shearing force, the mixing effect of various raw materials is improved, the raw materials continuously guided out downwards are circularly pushed upwards through a lower spiral conveying piece, so that the raw materials are radially distributed into a second material distribution cavity above, in this way, up-down circular material distribution is achieved in the continuous feeding process, and the material distribution synthesis effect is effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of material catalytic synthesis, and more specifically to a reverse material distribution type synthesizer applied to propylene carbonate production line processing. Background Art

[0002] Propylene carbonate is widely used as an electrolyte for capacitors and high-energy batteries, a desulfurization and decarbonization solvent, a metal extractant, an adhesive, and a plasticizer for polymers. During the production and processing of propylene carbonate, propylene oxide, carbon dioxide, and a catalyst need to be added to the reaction device for synthesis.

[0003] In a conventional propylene carbonate synthesis device, a plurality of porous plates are arranged at the upper end of the reaction device, and the raw materials pass through the plurality of porous plates from top to bottom to achieve uniform mixing of the raw materials. However, during the reaction synthesis process, the porous plates are prone to clogging. In addition, it is difficult to achieve efficient mixing of the raw materials by relying solely on the statically arranged porous plate diversion.

[0004] To this end, we proposed a reverse cloth synthesizer for use in propylene carbonate production line processing to address existing practical problems. Summary of the invention

[0005] The purpose of the present invention is to solve the problem that only distributing raw materials through multiple layers of porous plates easily causes clogging of the porous plates and it is difficult to achieve efficient mixing. Compared with the prior art, a reverse distribution type synthesizer applied to propylene carbonate production line processing is provided.

[0006] The object of the present invention can be achieved by the following technical scheme: a reverse material distribution type synthesizer applied to the production line processing of propylene carbonate comprises a synthesis tank, wherein a disc type material distribution mechanism and a synthesis bucket are installed up and down inside the synthesis tank, wherein the disc type material distribution mechanism comprises a material distribution cover fixedly installed in the synthesis tank and having an opening at the lower end, wherein a plurality of material distribution disks driven to rotate in opposite directions up and down are distributed on the material distribution cover, a material distribution cavity is reserved between the upper and lower material distribution disks, and a plurality of material distribution notches are annularly opened on the end wall of each material distribution disk, wherein a material guide pipe penetrating the material distribution cover and the material distribution disk and extending to the bottom of the synthesis bucket is rotatably installed at the top of the synthesis tank;

[0007] A rotating shaft for gas introduction is rotatably installed inside the material guide pipe, and an upper material guide port and a lower material guide port corresponding to the positions of the two uppermost material distribution cavities are opened on the end wall of the material guide pipe, and an upper spiral conveying piece and a lower spiral conveying piece are fixedly sleeved on the upper and lower end walls of the rotating shaft, and the opposite ends of the upper and lower material distribution ports are respectively adjacent to the upper and lower material distribution ports. A material distribution stirring structure is provided in the uppermost material distribution cavity, and multiple material dispensing pieces are annularly distributed in the multiple material distribution cavities below, and the material dispensing pieces are fixed to the bottom end of the material distribution plate at the top of the material distribution cavity.

[0008] Furthermore, an inlet pipe 1 for adding propylene oxide and an inlet pipe 2 for adding catalyst are respectively provided on both sides of the upper end of the guide pipe, and the outer end of the rotating shaft penetrates to the top of the synthesis tank and is connected to a carbon dioxide inlet pipe through a rotating joint.

[0009] Furthermore, a driving structure for driving the rotating shaft to rotate is installed at the top of the synthesis tank. A plurality of jet holes are provided on the end wall of the rotating shaft located at the top of the upper feeding chamber. Propylene oxide and catalyst are quantitatively added by inlet pipe one and inlet pipe two respectively. The rotating shaft is used to quantitatively deliver carbon dioxide, so that the three raw materials can be quantitatively delivered into the guide pipe synchronously and mixed, and are continuously delivered downward by the rotating upper spiral conveying piece.

[0010] Furthermore, a plurality of the distribution plates are fixedly sleeved with gear rings on their outer walls, a transmission gear set is rotatably installed at the outer end wall of the synthesis tank to drive the two upper and lower adjacent gear rings to rotate in opposite directions, and a power motor is installed at the outer end of the synthesis tank to drive the transmission gear set.

[0011] Furthermore, the top cross-sections of the plurality of cloth slots are all trapezoidal structures that are narrow inside and wide outside, and an expansion slot that expands outward and downward is provided at the bottom end of the cloth slot. The width of the cloth slot gradually decreases from the outside to the inside to adapt to the annular surface of the cloth disk, and the bottom end of the cloth slot is expanded downward to both sides, which helps to solve the problem of cloth slot blockage while ensuring that the cloth disk has a certain supporting thickness.

[0012] Furthermore, the material stirring structure includes a magnetic seat fixedly installed on the top of the material cover and a magnetic material shifting assembly adapted to the magnetic seat and initially embedded in the material groove. Support bars for supporting the magnetic material shifting assembly are embedded on both sides of the inner wall of the material groove.

[0013] Furthermore, the magnetic material-prying assembly includes a sealing strip embedded in the material-distributing groove and supported on a pair of supporting strips, a stirring plate with multiple material-distributing holes is fixed to the upper end of the sealing strip, and a magnetic docking strip compatible with the magnetic suction seat is provided at the top of the stirring plate.

[0014] Furthermore, the cross-section of the side of the sealing strip is a trapezoidal structure that is wide at the top and narrow at the bottom. The side of the supporting strip that contacts the sealing strip is inclined from top to bottom toward the sealing strip. In the initial state, the stirring assembly is embedded in the fabric groove, and a pair of supporting strips play a supporting and positioning role for the stirring assembly.

[0015] Furthermore, a detection box is embedded in the lower end of the synthesis tank, and a transparent detection tube is provided in the lower end of the detection box. The transparent detection tube is connected to the bottom end of the synthesis bucket in a loop through a sampling tube and a circulation tube. An infrared detection camera is provided in the upper end of the detection box and is located above the transparent detection tube.

[0016] Compared with the prior art, the advantages of the present invention are:

[0017] 1. A disc-type material distributing mechanism consisting of a material distributing cover and a material distributing disk installed inside the material distributing cover and driven to rotate in opposite directions up and down is provided. When distributing, the raw materials are radially distributed into the uppermost material distributing cavity in an annular shape through the upper spiral conveying sheet, and circulate through multiple material distributing disks rotating in opposite directions up and down from top to bottom. Under the multiple effects of gravity, centrifugal force and reverse shear force, the mixing effect between multiple raw materials is improved. The raw materials continuously discharged downward are then pushed upward in a cycle through the lower spiral conveying sheet, so that they are radially distributed into the second material distributing cavity above. In this way, the material synthesis effect is improved through continuous feeding and up and down circulation.

[0018] 2. A material distribution stirring structure is arranged in the uppermost material distribution cavity. In the initial state, the stirring component is embedded in the material distribution slot, so that the material distribution disk and the plurality of stirring components rotate in a circle, and the mixed raw materials introduced into the material distribution cavity are stirred. During the centrifugal rotation, the mixed raw materials are dispersed and distributed through the plurality of stirring blades to improve the mixing effect. After the mixing work is completed, the rotation of the material distribution disk is stopped, and the plurality of stirring components correspond to the lower end of the magnetic seat one by one. The magnetic seat is started to realize the magnetic positioning of the magnetic seat and the stirring component, and the stirring component is pushed upward away from the material distribution slot. At this time, after driving the uppermost material distribution disk to rotate, the material distribution disk and the plurality of stirring components are relatively moved, and the stirring component is used to push the mixed raw materials in the material distribution cavity from the material distribution slot to the lower material distribution cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the external structure of the present invention;

[0020] Figure 2 is a cross-sectional view of the present invention;

[0021] Figure 3 It is a structural schematic diagram of the junction between the disc-type material distributing mechanism and the synthesis bucket of the present invention;

[0022] Figure 4 The cross-sectional view of the junction between the disc-type material distributing mechanism and the synthetic bucket of the present invention Figure 1 ;

[0023] Figure 5 A top view of a joint of multiple cloth trays of the present invention;

[0024] Figure 6 A bottom view of a joint of multiple cloth trays of the present invention;

[0025] Figure 7 The cross-sectional view of the junction between the disc-type material distributing mechanism and the synthetic bucket of the present invention Figure 2 ;

[0026] Figure 8is an internal cross-sectional view of the material guide tube of the present invention;

[0027] Fig. 9 It is a cross-sectional view of the joint between the fabric cover and the top fabric tray of the present invention;

[0028] Fig.10 It is a partial cross-sectional view of the junction between the top material distribution plate and the material distribution stirring structure of the present invention;

[0029] Fig.11 It is a structural schematic diagram of the junction between the stirring assembly and the magnetic suction seat of the present invention;

[0030] Fig.12 This is a schematic diagram of the structure of the present invention when multiple distribution discs are driven to rotate in opposite directions up and down synchronously.

[0031] Description of the numbers in the figure:

[0032] 1. Synthesis tank; 2. Fabric cover; 3. Fabric plate; 301. Fabric notch; 302. Gear ring; 303. Support bar; 4. Material guide pipe; 401. Upper material guide port; 402. Lower material guide port; 5. Inlet pipe one; 6. Inlet pipe two; 7. Rotating shaft; 701. Jet hole; 8. Synthesis bucket; 9. Discharge pipe; 10. Upper spiral conveyor plate; 11. Lower spiral conveyor plate; 12. Stirring assembly; 121. Stirring plate; 122. Sealing strip; 123. Magnetic docking strip; 13. Magnetic seat; 14. Material transfer plate; 15. Detection box; 16. Sampling tube; 17. Circulation tube. DETAILED DESCRIPTION

[0033] The following will combine the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all the embodiments. All other embodiments obtained by ordinary technicians in this field without creative work based on the embodiments of the present invention belong to the scope of protection of the present invention.

[0034] Embodiment 1: In the mixing process of a common synthesis device, the raw materials are distributed only through multiple layers of fixedly installed porous plates, which easily cause the porous plates to be blocked and it is difficult to achieve efficient mixing. The following technical solutions are proposed for comparison:

[0035] The present invention discloses a reverse cloth type synthesizer for use in the production line processing of propylene carbonate, please refer to Figure 1-Figure 6 , including a synthesis tank 1, wherein the synthesis tank 1 is provided with a disc-type material distribution mechanism and a synthesis bucket 8 installed up and down, and the bottom end of the synthesis bucket 8 is externally connected with a discharge pipe 9 penetrating to the bottom of the synthesis tank 1;

[0036] The disc-type material distribution mechanism includes a material distribution cover 2 which is fixedly installed in the synthesis tank 1 and has an opening at the lower end. A plurality of material distribution discs 3 which are driven to rotate in opposite directions are distributed on the material distribution cover 2 in the vertical direction. A material distribution cavity is reserved between the upper and lower material distribution discs 3. The lowermost material distribution disc 3 is fixedly connected to the top of the synthesis bucket 8. A plurality of material distribution slots 301 which are staggered up and down are arranged in an annular manner on the end wall of each material distribution disc 3. A material guide pipe 4 which passes through the material distribution cover 2 and the material distribution disc 3 and extends to the bottom of the synthesis bucket 8 is rotatably installed on the top of the synthesis tank 1.

[0037] See also Figure 7 , Figure 8 , an inlet pipe 1 5 for adding propylene oxide and an inlet pipe 2 6 for adding catalyst are respectively arranged on both sides of the upper end of the guide pipe 4, a rotating shaft 7 for gas introduction is rotatably installed inside the guide pipe 4, the outer end of the rotating shaft 7 penetrates to the top of the synthesis tank 1 and is externally connected to a carbon dioxide inlet pipe through a rotary joint, and an upper guide port 401 and a lower guide port 402 are arranged on the end wall of the guide pipe 4 located in the cloth cover 2 and are distributed up and down and correspond to the positions of the two uppermost cloth cavities one by one, respectively, and a plurality of upper guide ports 401 and lower guide ports 402 are provided, and are respectively annularly arranged in the upper and lower directions of the outer end wall of the guide pipe 4;

[0038] A material guide platform is provided inside the material guide pipe 4, which is located inside the upper material guide port 401 and is fixedly sleeved with the rotating shaft 7. The material guide platform is a conical structure that is narrow at the top and wide at the bottom. The material guide platform divides the material guide pipe 4 into an upper material delivery cavity and a lower material delivery cavity. The arrangement of the material guide platform facilitates the use of the upper spiral conveying sheet 10 to guide the mixed raw materials in the upper material delivery cavity into the uppermost material distribution cavity through the upper material guide port 401;

[0039] The upper and lower end walls of the rotating shaft 7 are respectively fixedly sleeved with an upper spiral conveying piece 10 and a lower spiral conveying piece 11 located in the upper feeding cavity and the lower feeding cavity, and the spiral directions of the upper spiral conveying piece 10 and the lower spiral conveying piece 11 are arranged in opposite directions. A driving structure for driving the rotating shaft 7 to rotate is installed at the top of the synthesis tank 1. The driving structure is composed of an existing driving motor and a gear assembly. A plurality of gas injection holes 701 are opened on the end wall of the rotating shaft 7 located at the top of the upper feeding cavity. The propylene oxide and the catalyst are quantitatively added by the inlet pipe 1 5 and the inlet pipe 2 6 respectively. The rotating shaft 7 is used for quantitatively conveying carbon dioxide, so that the three raw materials are synchronously quantitatively entered into the guide pipe 4 for mixing, and are continuously conveyed downward by the rotating upper spiral conveying piece 10;

[0040] After the raw materials are distributed and mixed downwardly by the disc-type distribution mechanism, the raw materials are pushed upward again by the lower spiral conveying piece 11 at the lower end of the guide tube 4. The raw materials that are continuously pushed upward are introduced into the second distribution cavity above and mixed with the raw materials discharged from the first distribution cavity. This cycle is repeated to achieve the mixing of the raw materials in an upward and downward cycle.

[0041] See also Figure 1-Figure 3, a gear ring 302 is fixedly sleeved on the outer wall of the plurality of material distribution plates 3, a transmission gear set is rotatably installed at the outer end wall of the synthesis tank 1 to drive the upper and lower adjacent gear rings 302 to rotate in the opposite direction, and a power motor is installed at the outer end of the synthesis tank 1 to drive the transmission gear set;

[0042] The transmission gear set includes gear 1 and gear 2 which are respectively meshed with a pair of gear rings 302 above and are staggered on the left and right. Gear 3 is coaxially arranged with gear 1 and meshed with gear 2. Gear 4 is coaxially arranged with gear 3 and meshed with the lowermost gear ring 302 at the lower end. The power motor directly drives gear 1, gear 2, gear 3 and gear 4 to rotate synchronously. Relying on the meshing transmission, the upper and lower adjacent gear rings 302 can rotate in the opposite direction, thereby changing the rotation and stirring direction of the raw materials dropped from the feeding slot 301.

[0043] See also Figure 5-Figure 8 When distributing the material, propylene oxide and catalyst are quantitatively added into the material guide pipe 4 through the inlet pipe 1 5 and the inlet pipe 2 6 respectively. At the same time, high-pressure carbon dioxide gas is transported into the material guide pipe 4 through the rotating shaft 7. The carbon dioxide is dispersed into the material guide pipe 4 through multiple jet holes 701 and mixed with propylene oxide and catalyst.

[0044] Under the rotation of the upper spiral conveyor sheet 10, the raw materials are pushed to move downward continuously, and are radially distributed into the topmost distribution cavity in an annular shape through the material guide table and multiple upper material guide ports 401 under a certain pressure. The raw materials flow downward from top to bottom through the distribution slots 301 opened on the multiple distribution plates 3. Relying on the reverse rotation drive of the multiple distribution plates 3, the mixing effect between the multiple raw materials is improved under the multiple effects of gravity, reverse centrifugal force and shear force.

[0045] The raw materials continuously discharged downward fall into the synthesis bucket 8, and then circulate upward through the lower spiral conveying piece 11 at the lower end of the guide tube 4 to push the raw materials. Relying on the lower guide port 402, the raw materials are also radially distributed into the second distribution cavity above, and mixed with the preliminarily mixed raw materials discharged from above. In this way, the material synthesis effect is improved and the product purity is improved through continuous feeding and upper and lower circulating distribution.

[0046] Embodiment 2: This embodiment is aimed at Embodiment 1, and improves and optimizes the structure and the material distribution process of the disc-type material distribution mechanism, as follows:

[0047] See also Figure 5 , Figure 6The top cross-sections of the multiple cloth slots 301 are all trapezoidal structures that are narrow inside and wide outside, and the bottom ends of the cloth slots 301 are provided with expansion slots that expand outward and downward. The width of the cloth slots 301 gradually decreases from the outside to the inside to adapt to the annular surface of the cloth tray 3, and the bottom ends of the cloth slots 301 are expanded downward to both sides, which is beneficial to reduce the problem of blockage of the cloth slots 301 while ensuring that the cloth tray 3 has a certain supporting thickness.

[0048] A material stirring structure is provided in the uppermost material distributing cavity, and multiple material distributing cavities located below are all provided with multiple material distributing pieces 14 distributed in an annular shape, and the material distributing pieces 14 are fixed to the bottom end of the material distributing plate 3 at the top of the material distributing cavity;

[0049] See also Figure 9-11 The material stirring structure includes a magnetic seat 13 fixedly installed on the top of the material cover 2 and a magnetic material shifting component adapted to the magnetic seat 13 and initially embedded in the material shifting slot 301. Support bars 303 for supporting the magnetic material shifting component are embedded on both sides of the inner wall of the material shifting slot 301. The magnetic material shifting component includes a blocking bar 122 embedded in the material shifting slot 301 and supported on a pair of supporting bars 303. A stirring sheet 121 with multiple material holes is fixed on the upper end of the sealing bar 122. A magnetic docking bar 123 adapted to the magnetic seat 13 is provided on the top of the stirring sheet 121.

[0050] The side cross section of the blocking strip 122 is a trapezoidal structure that is wide at the top and narrow at the bottom. The supporting strip 303 is arranged to be inclined from top to bottom toward the blocking strip 122 on one side in contact with the blocking strip 122. In the initial state, the stirring assembly 12 is embedded in the material distribution slot 301. The pair of supporting strips 303 play a supporting and positioning role for the stirring assembly 12. When the material distribution disc 3 rotates, the material distribution disc 3 and the plurality of stirring assemblies 12 rotate in a circle to stir the mixed raw materials introduced into the material distribution cavity. During the centrifugal rotation process, the mixed raw materials are dispersed and distributed through the plurality of stirring blades 121 to improve the mixing effect.

[0051] See also Fig.12 After the mixing work is completed, the rotation of the material distribution disk 3 is stopped, and the multiple stirring components 12 correspond to the lower end of the magnetic seat 13 one by one, and the upper end of the magnetic docking strip 123 is attached to the lower end of the magnetic seat 13. At this time, the magnetic seat 13 is started, and the magnetic seat 13 has a magnetic effect on the magnetic docking strip 123, so that the stirring component 12 is magnetically positioned upward, and the blocking strip 122 is separated from the material distribution slot 301 and is flush with the upper end surface of the material distribution disk 3. After the magnetic seat 13 and the stirring component 12 are positioned, at this time, the uppermost material distribution disk 3 is driven to rotate, and the material distribution disk 3 and the multiple stirring components 12 are relied on to rely on the relative movement of the stirring component 12 to push the mixed raw materials in the distribution cavity from the distribution slot 301 to the lower distribution cavity;

[0052] During the synchronous reverse rotation of the multiple material distribution plates 3, the raw materials are discharged from the top to the bottom through the multiple material distribution slots 301 and finally fall into the synthesis bucket 8;

[0053] The raw materials continuously pushed upward by the lower spiral conveying piece 11 are introduced into the second upper distribution cavity through multiple lower material guide ports 402. Multiple material-digging pieces 14 are distributed in an annular shape, and two adjacent material-digging pieces 14 form a material-digging space that is narrow inside and wide outside. Under the centrifugal force, the raw materials discharged from the lower material guide ports 402 are easily moved to the outside of the material-digging space and mixed with the raw materials discharged from the first distribution cavity. This cycle is repeated to achieve the mixing of the raw materials in an upper and lower circulation.

[0054] Note that in the subsequent circulation distribution process, after the feeding is stopped, the distribution continues to circulate up and down. In this process, the magnetic seat 13 is used to magnetically position the stirring component 12 to reduce the rotation pressure of the uppermost distribution plate 3. In this way, in the process of stopping the feeding, the distribution is circulated up and down, and the distribution plate 3 moving in reverse up and down cooperates with the material-dispensing piece 14 to provide reverse centrifugal force and shear force to the raw materials from top to bottom, which not only promotes efficient dispersion of the raw materials, but also gives the raw materials reverse scraping thrust, improves the mixing effect, and is also conducive to the smooth downward discharge of the raw materials through the distribution slot 301.

[0055] Example 3: This example is based on the working process of Examples 1 and 2. Please refer to Figure 7 , an external detection box 15, a sampling tube 16, and a circulation tube 17 are connected to the bottom of the synthesis bucket 8. The detection box 15 is embedded and installed at the lower end of the synthesis tank 1. A transparent detection tube is arranged in the lower end of the detection box 15. The transparent detection tube is connected to the bottom of the synthesis bucket 8 in a loop through the sampling tube 16 and the circulation tube 17. An infrared detection camera is arranged above the transparent detection tube in the upper end of the detection box 15;

[0056] During the synthesis process of propylene carbonate, within the detection period, propylene carbonate samples are collected through the detection box 15 and transported to the transparent detection tube. The infrared detection camera is used to shoot, and the infrared detection picture is obtained. The characteristic temperature value is extracted and marked as TWi. The sampling is repeated N times, and n times is set as a group, with a total of N / n groups. The characteristic temperature average of each group is taken and marked as TWj. When the characteristic temperature averages of the N / n groups are all within the preset characteristic temperature threshold range, it indicates that the propylene carbonate synthesis has reached the standard, and the cyclic feeding of the lower spiral conveying sheet 11 is stopped. Otherwise, the cyclic feeding is continued until the characteristic temperature average reaches the preset characteristic temperature threshold range.

[0057] In summary, a disc-type material distribution mechanism fixed to the top of the synthesis bucket 8 is arranged in the synthesis tank 1. The disc-type material distribution mechanism is composed of a material distribution cover 2 and a material distribution disk 3 installed therein and driven to rotate in opposite directions up and down. A material distribution cavity is formed between the upper and lower material distribution disks 3. When distributing, the mixed raw materials are radially distributed into the uppermost material distribution cavity in an annular shape through the upper spiral conveying sheet 10, and circulate through multiple material distribution disks 3 that rotate in opposite directions up and down from top to bottom. Under the multiple effects of gravity, centrifugal force and reverse shear force, the mixing effect between multiple raw materials is improved. The raw materials continuously discharged downward are then circulated upward through the lower spiral conveying sheet 11 at the lower end of the guide pipe 4 to push the raw materials so that they are radially distributed into the second material distribution cavity above and mixed with the preliminary mixed raw materials discharged from above. In this way, the material synthesis effect is improved and the purity of the product is improved through continuous feeding and up and down cyclic distribution.

[0058] The above are only preferred specific implementation modes of the present invention; however, the protection scope of the present invention is not limited thereto; any technician familiar with the technical field within the technical scope disclosed by the present invention; any equivalent replacement or change based on the technical solution and improved concept of the present invention shall be covered within the protection scope of the present invention.

Claims

1. A reverse cloth type synthesizer for use in a propylene carbonate production line, comprising a synthesis tank (1), characterized in that: The synthesis tank (1) is provided with a disc-type material distribution mechanism and a synthesis bucket (8) installed up and down, and a material guide pipe (4) passing through the two. The disc-type material distribution mechanism comprises a material distribution cover (2) fixedly installed in the synthesis tank (1) and having an opening at the lower end. A plurality of material distribution discs (3) driven to rotate in opposite directions are distributed on the material distribution cover (2). A material distribution cavity is reserved between the upper and lower material distribution discs (3). A plurality of material distribution notches (301) are annularly provided on the end wall of each material distribution disc (3); A rotating shaft (7) for gas introduction is rotatably mounted inside the material guide pipe (4), an upper material guide port (401) and a lower material guide port (402) are provided on the end wall of the material guide pipe (4), and the upper and lower end walls of the rotating shaft (7) are respectively fixedly sleeved with an upper spiral conveying piece (10) and a lower spiral conveying piece (11) which are respectively arranged at opposite ends adjacent to the upper material guide port (401) and the lower material guide port (402), a material stirring structure is provided in the uppermost material distribution cavity, and a plurality of material shifting pieces (14) are annularly distributed in the plurality of material distribution cavities located below, and the material shifting pieces (14) are fixed to the bottom end of the material distribution plate (3) at the top of the material distribution cavity.

2. The reverse cloth type synthesizer used in the propylene carbonate production line processing according to claim 1, characterized in that: An inlet pipe 1 (5) for adding propylene oxide and an inlet pipe 2 (6) for adding catalyst are respectively provided on both sides of the upper end of the guide pipe (4); the outer end of the rotating shaft (7) penetrates through the top of the synthesis tank (1) and is externally connected to a carbon dioxide inlet pipe via a rotating joint.

3. The reverse cloth type synthesizer used in the propylene carbonate production line processing according to claim 2 is characterized in that: A driving structure for driving a rotating shaft (7) to rotate is installed at the top of the synthesis tank (1), and a plurality of air injection holes (701) are provided on the end wall of the rotating shaft (7) located at the top of the upper feeding chamber.

4. The reverse cloth type synthesizer for propylene carbonate production line processing according to claim 1, characterized in that: A gear ring (302) is fixed on the outer wall of each of the plurality of material distribution plates (3); a transmission gear set is rotatably mounted on the outer end wall of the synthesis tank (1) to drive two upper and lower adjacent gear rings (302) to rotate in opposite directions; and a power motor is mounted on the outer end of the synthesis tank (1) to drive the transmission gear set.

5. The reverse cloth type synthesizer used in the propylene carbonate production line processing according to claim 1, characterized in that: The top cross-sections of the plurality of material distribution slots (301) are all trapezoidal structures that are narrow inside and wide outside, and the bottom ends of the material distribution slots (301) are provided with expansion slots that expand outward and downward.

6. The reverse cloth type synthesizer used in the propylene carbonate production line processing according to claim 5, characterized in that: The material stirring structure comprises a magnetic seat (13) fixedly mounted on the top of the material cover (2) and a magnetic material shifting assembly adapted to the magnetic seat (13) and initially embedded in the material shifting slot (301), and support bars (303) for supporting the magnetic material shifting assembly are embedded on both sides of the inner wall of the material shifting slot (301).

7. The reverse cloth type synthesizer for propylene carbonate production line processing according to claim 6, characterized in that: The magnetic material-prying assembly comprises a sealing strip (122) embedded in a material-distributing slot (301) and supported on a pair of supporting strips (303); a stirring sheet (121) with a plurality of material-distributing holes is fixed to the upper end of the sealing strip (122); and a magnetic docking strip (123) adapted to the magnetic suction seat (13) is provided at the top end of the stirring sheet (121).

8. The reverse cloth type synthesizer for propylene carbonate production line processing according to claim 7, characterized in that: The side cross section of the blocking strip (122) is a trapezoidal structure that is wide at the top and narrow at the bottom. The side of the supporting strip (303) that contacts the blocking strip (122) is inclined from top to bottom toward the blocking strip (122).

9. The reverse cloth type synthesizer for propylene carbonate production line processing according to claim 1, characterized in that: A detection box (15) is embedded in the lower end of the synthesis tank (1), and a transparent detection tube is arranged in the lower end of the detection box (15). The transparent detection tube is connected to the bottom end of the synthesis bucket (8) in a loop through a sampling tube (16) and a circulation tube (17), and an infrared detection camera is arranged above the transparent detection tube in the upper end of the detection box (15).

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