Photo gasification reaction continuous stirring tank type reactor for polycarbonate

Abstract

The utility model discloses a phosgenation reaction continuous stirring kettle type reactor for polycarbonate, which comprises a reaction kettle body, a stirring component is arranged in the reaction kettle body, the reactor also comprises a feeding port arranged on the reaction kettle body, and a comonomer enters the reaction kettle body through the feeding port; a quantifying plate and a discharging assembly are arranged in the feeding opening, and a plurality of through quantifying holes are formed in the quantifying plate; the discharging assembly comprises a shielding part and a dredging part, the shielding part and the dredging part are arranged at the two ends of the quantifying plate, the shielding part is used for shielding the quantifying hole, and the shielding part relieves shielding of the quantifying hole based on extrusion of the dredging part; the quantitative plate is arranged, the quantity of comonomer powder borne by the quantitative holes in the quantitative plate is constant, and the quantitative comonomer powder can be pushed into the reaction kettle body every time along with the movement of the dredging part, so that the situation that excessive comonomer powder is fed at a time is avoided; and the comonomer and the raw materials in the reaction kettle body cannot be fully and uniformly mixed.

Description

Technical Field

[0001] The utility model relates to the field of polycarbonate production, in particular to a continuous stirred tank reactor for phosgenation reaction of polycarbonate. Background Art

[0002] Polycarbonate is a high-molecular polymer containing carbonate groups in its molecular chain. It exhibits outstanding impact and creep resistance, high tensile strength, flexural strength, elongation, and rigidity, and can withstand explosions from television screens. It also exhibits high heat and cold resistance, excellent electrical properties, low water absorption, good light transmittance, and can be colored in any color. Currently, large-scale industrial production primarily utilizes aromatic polycarbonate, the second-largest engineering plastic globally after nylon. It has a wide range of applications in the national economy, including automotive, electrical and electronics, construction, office equipment, packaging, sports equipment, healthcare, and household goods. Currently, industrial production primarily utilizes the interfacial phosgene method and the melt transesterification method to produce polycarbonate. The interfacial phosgene method, which dominates the industry, involves the reaction of a phenolate dissolved in an aqueous alkali metal solution with phosgene dissolved in an inert organic solvent, such as dichloromethane, at the oil-water interface in the presence of an acid acceptor, such as an alkali metal hydroxide solution, and a catalyst. Polycarbonate resin is then separated and purified to produce the resulting product.

[0003] For example, the patent with publication number CN218530565U and publication date February 28, 2023, discloses a homogenizing mixing equipment for polycarbonate production. A connecting plate is provided on the mixing barrel device, and a motor is provided on the connecting plate. The motor drives the gear to rotate, the gear drives the gear teeth to rotate, the gear teeth drive the nut to rotate, and the nut drives the threaded column to move up and down while rotating. The threaded column drives the sleeve to move and rotate, the sleeve drives the cross bar to move and rotate, and the cross bar drives the stirring rod to move and rotate. The stirring rod stirs the polycarbonate, and the cross bar simultaneously drives the scraper to rotate along the inner wall of the inner barrel, thereby scraping off the polycarbonate on the inner wall to prevent the polycarbonate from accumulating and solidifying on the inner wall. This structure can enable sufficient stirring at multiple positions inside the mixing barrel device, improve stirring efficiency, and shorten working hours.

[0004] When existing polycarbonates are produced using the phosgene method, the raw materials need to be added to a reactor for stirring and mixing. In order to produce high-performance and high-quality polycarbonate products, workers often add comonomers (such as hydrogenated bisphenol A, bisphenol fluorene, bisphenol TMC, etc.) to the raw materials and stir them together. When adding the comonomers, existing workers usually pour the comonomers directly into the reactor. A large amount of comonomers enter the reactor at one time, and the comonomers are prone to agglomeration. As a result, the comonomers cannot be fully mixed with the materials in the reactor, affecting the quality of the polycarbonate products. Utility Model Content

[0005] The purpose of the utility model is to provide a continuous stirred tank reactor for phosgenation reaction of polycarbonate to solve the above-mentioned shortcomings in the prior art.

[0006] In order to achieve the above purpose, the present invention provides the following technical solutions:

[0007] A continuous stirred tank reactor for phosgenation reaction of polycarbonate comprises a reactor body, a stirring assembly is provided in the reactor body, and a feeding port is provided on the reactor body, through which comonomers enter the reactor body; a quantitative plate and a discharge assembly are provided in the feeding port, and a plurality of penetrating quantitative holes are provided on the quantitative plate, and the quantitative holes are used for filling comonomer powder; the discharge assembly comprises a shielding part and a dredging part, and the shielding part and the dredging part are arranged at both ends of the quantitative plate, and the shielding part is used to prevent the comonomer powder in the quantitative holes from entering the reactor body, and the shielding part releases the shielding of the quantitative holes based on the extrusion of the dredging part.

[0008] As mentioned above, the feeding port is in the shape of a rectangular ring and is coaxially arranged with the reactor body.

[0009] As mentioned above, the shielding portion includes a plurality of shielding pieces, which correspond one to one with the plurality of quantitative holes. The shielding pieces are rotatably mounted on the lower end surface of the quantitative plate, and the shielding pieces are connected to the quantitative plate via a torsion spring.

[0010] As mentioned above, the dredging part includes a mounting plate and an electrically controlled telescopic part, which is connected to the mounting plate. The electrically controlled telescopic part drives the mounting plate to move toward the quantitative plate. A plurality of insertion rods are installed on the mounting plate, and the plurality of insertion rods correspond one-to-one to the plurality of quantitative holes on the quantitative plate.

[0011] As mentioned above, the insertion rod is rotationally connected to the mounting plate.

[0012] As mentioned above, the quantitative hole is divided into a preparation section and a discharge section from top to bottom.

[0013] As mentioned above, the material preparation section is in the shape of an inverted truncated cone, the material discharge section is in the shape of a cylinder, and the material discharge section is adapted to the insertion rod.

[0014] As mentioned above, a rectangular spiral groove is provided on the inner wall of the discharge section.

[0015] As mentioned above, a protrusion is installed on the outer wall of the insertion rod, and the protrusion is adapted to the rectangular spiral groove.

[0016] As mentioned above, a material shifting rod is further provided on the outer wall of the insertion rod, and the material shifting rod is located above the protrusion.

[0017] The beneficial effect of the present invention is that: in the above technical solution, the present invention provides a continuous stirred tank reactor for phosgenation reaction of polycarbonate, by setting a quantitative plate, the quantitative holes on the quantitative plate carry a certain amount of comonomer powder, and as the dredging part reciprocates up and down each time, a quantitative amount of comonomer powder can be pushed into the interior of the reactor body each time, avoiding the situation where too much comonomer powder is added at one time, resulting in the comonomer and the raw materials in the reactor body not being fully mixed evenly, affecting the efficiency and quality of the subsequently produced polycarbonate products. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0019] Figure 1 A front view schematic diagram of a continuous stirred tank reactor for phosgenation of polycarbonate provided in an embodiment of the present invention;

[0020] Figure 2 The embodiment of the present utility model provides Figure 1 Schematic cross-sectional view of AA;

[0021] Figure 3 The embodiment of the present utility model provides Figure 2 Schematic cross-section of BB;

[0022] Figure 4 The embodiment of the present utility model provides Figure 3 An enlarged schematic diagram of point C;

[0023] Figure 5 The embodiment of the present utility model provides Figure 4 Enlarged schematic diagram of point D.

[0024] Description of reference numerals:

[0025] 1. Reactor body; 2. Stirring assembly; 3. Feeding port; 4. Dosing plate; 5. Dosing hole; 51. Preparation section; 52. Discharge section; 6. Discharge assembly; 61. Shielding part; 611. Shielding piece; 612. Torsion spring; 62. Clearing part; 621. Mounting plate; 622. Insert rod; 623. Electric telescopic part; 7. Rectangular spiral groove; 8. Feeding rod; 9. Bump. DETAILED DESCRIPTION

[0026] In order to make those skilled in the art better understand the technical solution of the present invention, Figure 1-5, the utility model is further introduced in detail.

[0027] An embodiment of the present invention provides a continuous stirred tank reactor for phosgenation reaction of polycarbonate, comprising a reactor body 1, wherein a stirring assembly 2 is provided in the reactor body 1, and further comprising a feeding port 3 opened on the reactor body 1, through which the comonomer enters the reactor body 1; a quantitative plate 4 and a discharge assembly 6 are arranged in the feeding port 3, wherein the quantitative plate 4 is provided with a plurality of penetrating quantitative holes 5, and the quantitative holes 5 are used for filling the comonomer powder; the discharge assembly 6 comprises a shielding portion 61 and a dredging portion 62, wherein the shielding portion 61 and the dredging portion 62 are respectively disposed at both ends of the quantitative plate 4, the shielding portion 61 is used to prevent the comonomer powder in the quantitative holes 5 from entering the reactor body 1, and the shielding portion 61 releases the shielding of the quantitative holes 5 based on the extrusion of the dredging portion 62.

[0028] Specifically, the stirring component 2 can be a combination of a drive motor and a stirring blade, the drive motor is located outside the reactor body 1, the stirring blade is located inside the reactor body 1, the output end of the drive motor is connected to the stirring blade, and the drive motor drives the stirring blade to rotate inside the reactor body 1 to stir the material in the reactor body 1. Among them, when the existing polycarbonate is produced using the phosgene method, the raw materials for preparing polycarbonate need to be put into the reactor body 1, and the raw materials are stirred and mixed by the stirring component 2. In addition, in order to produce high-performance and high-quality polycarbonate products, the staff often add comonomers (such as hydrogenated bisphenol A, bisphenol fluorene, bisphenol TMC and other materials) to the raw materials for preparing polycarbonate and stir them together to produce high-performance and high-quality polycarbonate products.

[0029] However, when adding comonomers, current staff usually pour the comonomers directly into the reactor body 1 to mix with the raw materials. As a large amount of comonomers enter the reactor body 1 at one time, a large amount of comonomers in the reactor body 1 gather together during mixing, and agglomeration is likely to occur, resulting in the comonomers and the raw materials in the reactor body 1 not being fully mixed (or requiring the stirring component 2 to stir for a long time to stir evenly), affecting the efficiency and quality of the subsequently produced polycarbonate products.

[0030] In order to solve the above problems, a feeding port 3 for feeding the comonomer is provided on the reactor body 1, and the feeding port 3 is located above the reactor body 1, wherein a quantitative plate 4 is provided in the feeding port 3, and the cross-section of the quantitative plate 4 is adapted to the feeding port 3, wherein the shielding portion 61 is located below the quantitative plate 4, and the shielding portion 61 blocks the quantitative hole 5 on the quantitative plate 4, preventing the comonomer powder from entering the interior of the reactor body 1 through the quantitative hole 5, and the dredging portion 62 is located above the quantitative plate 4. In the initial state, the dredging portion 62 is spaced apart from the quantitative plate 4. When the comonomer powder needs to be fed, the dredging portion 62 descends through the quantitative hole 5 on the quantitative plate 4. Under the extrusion of the dredging portion 62, the shielding portion 61 below the quantitative plate 4 opens, removing the obstruction of the quantitative hole 5. At this time, the powder originally in the quantitative hole 5 is pushed into the reactor body 1 under the extrusion of the dredging part 62, completing the addition operation of the comonomer powder. As the dredging part 62 reciprocates up and down each time, a quantitative amount of comonomer powder can be pushed into the interior of the reactor body 1 each time (the amount of comonomer powder entering the reactor body 1 each time is the amount carried by the quantitative holes 5 on the quantitative plate 4. Since the depth of the quantitative holes 5 on the quantitative plate 4 is consistent, the amount of comonomer powder entering the reactor body 1 each time under the extrusion of the dredging part 62 is constant). This avoids the situation where too much comonomer powder is added at one time, resulting in the comonomer and the raw materials in the reactor body 1 not being fully mixed, thereby affecting the efficiency and quality of the subsequently produced polycarbonate products.

[0031] Preferably, in this embodiment, the feeding port 3 is in the shape of a rectangular ring, and the feeding port 3 is coaxially arranged with the reactor body 1. When the annular feeding port 3 is used for feeding, the comonomer powder fed into the reactor body 1 falls into the reactor body 1, so that the comonomer powder can be evenly sprinkled into the interior of the reactor body 1, so that the comonomer can be evenly mixed with the raw materials in the reactor body 1.

[0032] Preferably, in this embodiment, the shielding portion 61 includes a plurality of shielding pieces 611, and the plurality of shielding pieces 611 correspond one-to-one to the plurality of quantitative holes 5. The shielding pieces 611 are rotatably mounted on the lower end surface of the quantitative plate 4. The shielding pieces 611 are connected to the quantitative plate 4 through a torsion spring 612. When the torsion spring 612 is not under force, the shielding pieces 611 block the corresponding quantitative holes 5. The dredging portion 62 includes a mounting plate 621 and an electrically controlled telescopic portion 623. The electrically controlled telescopic portion 623 is connected to the mounting plate 621. The electrically controlled telescopic portion 623 drives the mounting plate 621 to move toward the direction of the quantitative plate 4. A plurality of insertion rods 622 are mounted on the mounting plate 621. The plurality of insertion rods 622 correspond one-to-one to the plurality of quantitative holes 5 on the quantitative plate 4.

[0033] Specifically, in order to facilitate the feeding of comonomer powder into the feeding port 3, an external feeding pipe can be connected to the feeding port 3, and the feeding pipe continuously transports the comonomer powder into the feeding port 3. In the initial state, the insertion rod 622 is spaced apart from the quantitative hole 5. In this embodiment, the insertion rod 622 is connected to the mounting plate 621 by a threaded connection.

[0034] Thus, the process of adding the comonomer powder is as follows:

[0035] The feeding pipe conveys the comonomer powder to the feeding port 3, and the comonomer powder enters the quantitative hole 5 under the action of gravity. At this time, because there is a shielding part 61 under the quantitative plate 4, the shielding piece 611 on the shielding part 61 blocks the quantitative hole 5, preventing the comonomer powder in the quantitative hole 5 from entering the reactor body 1. When the comonomer powder needs to be fed, the electrically controlled telescopic part 623 begins to extend, and the electrically controlled telescopic part 623 moves with the mounting plate 621 toward the direction of the quantitative plate 4, and the mounting plate 621 moves with the insertion rod 622 moves synchronously, the insertion rod 622 is inserted into the quantitative hole 5, and the comonomer powder in the quantitative hole 5 is poked into the reactor body 1. At this time, the shielding piece 611 rotates under the extrusion of the insertion rod 622 (the torsion spring 612 accumulates elastic potential energy), and the quantitative hole 5 is opened, completing the feeding process of the comonomer powder. At this time, the comonomer powder enters the interior of the reactor body 1 along the annular quantitative plate 4, ensuring that the comonomer powder can be quantitatively and evenly sprinkled into the interior of the reactor body 1 and mixed with the raw materials inside the reactor body 1.

[0036] It should be noted that when the comonomer powder in the metering hole 5 is emptied, the comonomer powder in the metering hole 5 needs to be replenished. Preferably, the insertion rod 622 is rotatably connected to the mounting plate 621, and the outer wall of the insertion rod 622 is provided with a material removal rod 8 and a protrusion 9 from top to bottom. The protrusion 9 is adapted to the rectangular spiral groove 7. The material removal rod 8 is slidably installed on the insertion rod 622 along the vertical direction. In addition, the metering hole 5 is divided into a preparation section 51 and a discharge section 52 from top to bottom. The preparation section 51 is an inverted frustum, and the discharge section 52 is cylindrical. The discharge section 52 is adapted to the insertion rod 622; a rectangular spiral groove 7 is provided on the inner wall of the discharge section 52.

[0037] Specifically, the process of replenishing the comonomer powder in the quantitative hole 5 is as follows:

[0038] First, the feeding pipe conveys the comonomer powder to the feeding port 3, and the comonomer powder falls on the quantitative plate 4. Because the bottom of the quantitative hole 5 on the quantitative plate 4 is blocked by the blocking portion 61, the comonomer covers the surface of the quantitative plate 4, and under the action of gravity, the comonomer powder fills the entire quantitative hole 5. At this time, the preparation section 51 and the discharge section 52 of the quantitative hole 5 are both filled with comonomer powder. When it is necessary to add comonomer powder, the electrically controlled telescopic portion 623 begins to extend, and the electrically controlled telescopic portion 623 moves toward the direction of the quantitative plate 4 with the mounting plate 621. The mounting plate 621 moves synchronously with the insertion rod 622, and the insertion rod 622 is inserted into the quantitative hole 5, and the comonomer powder in the discharge section 52 of the quantitative hole 5 is poked into the reactor body 1. At this time, the blocking piece 611 rotates under the extrusion of the insertion rod 622 (the torsion spring 612 accumulates elastic potential energy), the quantitative hole 5 is opened, and the feeding process of the comonomer powder is completed;

[0039] Subsequently, the electrically controlled telescopic portion 623 starts to move, and the electrically controlled telescopic portion 623 moves with the mounting plate 621 in a direction away from the quantitative plate 4. The mounting plate 621 moves synchronously with the insertion rod 622, and the insertion rod 622 leaves the quantitative hole 5. The torsion spring 612 connected to the shielding piece 611 releases the accumulated elastic potential energy, and the shielding piece 611 returns to its original state to block the bottom of the quantitative hole 5 again. Subsequently, the comonomer powder in the preparation section 51 enters the discharge section 52, completing the filling process of the comonomer powder in the discharge section 52. At this time, the preparation section 51 of the quantitative hole 5 is in an empty state (or there is only a small amount of comonomer powder in the preparation section 51, and most of the comonomer powder is on the surface of the quantitative plate 4).

[0040] Afterwards, the electrically controlled telescopic part 623 continues to extend, and the electrically controlled telescopic part 623 moves toward the direction of the quantitative plate 4 with the mounting plate 621, and the mounting plate 621 moves synchronously with the insertion rod 622, and the insertion rod 622 is inserted into the quantitative hole 5, and the comonomer powder in the discharge section 52 of the quantitative hole 5 is poked into the reactor body 1, and as the insertion rod 622 descends, the protrusion 9 on the insertion rod 622 is inserted into the rectangular spiral groove 7, and at this time the material rod 8 also contacts the surface of the quantitative plate 4, and then, as the insertion rod 622 descends, the protrusion 9 slides along the rectangular spiral groove 7, and the protrusion 9 rotates with the insertion rod 622, and the insertion rod 622 rotates synchronously with the material rod 8, and the material rod 8 re-dials the comonomer powder on the quantitative plate 4 into the preparation section 51 of the quantitative hole 5, completing the material filling process of the preparation section 51.

[0041] The above description is merely illustrative of certain exemplary embodiments of the present invention. It goes without saying that those skilled in the art will be able to modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A continuous stirred tank reactor for phosgenation of polycarbonate, comprising a reactor body (1), a stirring assembly (2) disposed within the reactor body (1), and characterized in that: Also includes: A feeding port (3) is provided on the reactor body (1), and the comonomer enters the reactor body (1) through the feeding port (3); A quantitative plate (4) is arranged in the feeding port (3), and a plurality of through quantitative holes (5) are opened on the quantitative plate (4), and the quantitative holes (5) are used to fill the comonomer powder; A discharge assembly (6) is arranged in the feeding port (3), and the discharge assembly (6) includes a shielding portion (61) and a dredging portion (62). The shielding portion (61) and the dredging portion (62) are respectively arranged at two ends of the quantitative plate (4). The shielding portion (61) is used to prevent the comonomer powder in the quantitative hole (5) from entering the reactor body (1). The shielding portion (61) releases the shielding of the quantitative hole (5) based on the squeezing of the dredging portion (62).

2. The continuous stirred tank reactor for phosgenation of polycarbonate according to claim 1, characterized in that: The feeding port (3) is in the shape of a rectangular ring, and the feeding port (3) and the reactor body (1) are coaxially arranged.

3. The continuous stirred tank reactor for phosgenation of polycarbonate according to claim 1, characterized in that: The shielding portion (61) comprises a plurality of shielding pieces (611), the plurality of shielding pieces (611) corresponding one to one with the plurality of quantitative holes (5), the shielding pieces (611) being rotatably mounted on the lower end surface of the quantitative plate (4), and the shielding pieces (611) and the quantitative plate (4) being connected via a torsion spring (612).

4. A continuous stirred tank reactor for phosgenation of polycarbonate according to claim 3, characterized in that: The dredging portion (62) includes a mounting plate (621) and an electrically controlled telescopic portion (623). The electrically controlled telescopic portion (623) is connected to the mounting plate (621). The electrically controlled telescopic portion (623) drives the mounting plate (621) to move toward the quantitative plate (4). A plurality of insertion rods (622) are mounted on the mounting plate (621). The plurality of insertion rods (622) correspond one-to-one to the plurality of quantitative holes (5) on the quantitative plate (4).

5. A continuous stirred tank reactor for phosgenation of polycarbonate according to claim 4, characterized in that: The insertion rod (622) is rotatably connected to the mounting plate (621).

6. A continuous stirred tank reactor for phosgenation of polycarbonate according to claim 5, characterized in that: The quantitative hole (5) is divided into a material preparation section (51) and a material discharge section (52) from top to bottom.

7. A continuous stirred tank reactor for phosgenation of polycarbonate according to claim 6, characterized in that: The material preparation section (51) is in the shape of an inverted truncated cone, the material discharge section (52) is in the shape of a cylinder, and the material discharge section (52) is adapted to the insertion rod (622).

8. A continuous stirred tank reactor for phosgenation of polycarbonate according to claim 7, characterized in that: A rectangular spiral groove (7) is provided on the inner wall of the discharge section (52).

9. A continuous stirred tank reactor for phosgenation of polycarbonate according to claim 8, characterized in that: A protrusion (9) is installed on the outer wall of the insertion rod (622), and the protrusion (9) is adapted to the rectangular spiral groove (7).

10. A continuous stirred tank reactor for phosgenation of polycarbonate according to claim 9, characterized in that: A material-moving rod (8) is slidably mounted on the outer wall of the insertion rod (622) in a vertical direction, and the material-moving rod (8) is located above the protrusion (9).

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