Suspension method polyvinyl chloride variable temperature control production device

Abstract

The utility model relates to the technical field of reaction kettle especially is a kind of suspension method polyvinyl chloride temperature control production device of varying, including reaction kettle, the top end fixedly connected of reaction kettle has feeding pump, the inboard fixedly connected of feeding pump has circulating water upper water valve pipe and circulating water backwater valve pipe, the lower end fixedly connected of reaction kettle has drive assembly, the inboard installation of drive assembly has stirring assembly, the inboard fixedly connected of reaction kettle right end has circulating water backwater pipeline system, the inboard fixedly connected of reaction kettle left end has circulating water upper water pipeline system, the lower end fixedly connected of reaction kettle has ionless water adding device and initiator adding device, the upper end fixedly connected of reaction kettle has polyethylene monomer adding device and terminator adding device, in the utility model, device can effectively improve production efficiency, reduce energy consumption and optimize product quality, provide more efficient, energy -conserving and environmental protection's solution for the production of polyvinyl chloride resin.

Description

Technical Field

[0001] This utility model relates to the field of reaction vessel technology, specifically to a suspension process polyvinyl chloride temperature control production device. Background Technology

[0002] The suspension polymerization process for polyvinyl chloride (PVC) with temperature control is a device used to produce PVC resin. It optimizes production efficiency and product quality by precisely controlling temperature changes during the polymerization reaction. In the production process, it combines isothermal polymerization and stepped temperature-controlled polymerization. The polymerization reaction is first carried out at a constant temperature. When the conversion rate reaches a certain proportion, it switches to stepped temperature control mode to improve the activity of the initiator and ensure the uniformity and stability of the reaction. This temperature control method can effectively reduce production energy consumption, shorten the production cycle, and improve product quality and single-reactor capacity.

[0003] Currently, all existing suspension polyvinyl chloride (PVC) temperature-controlled production processes employ constant temperature control. The process flow is described as follows: Once the polymerization reactor is ready for feeding, deionized water, vinyl chloride monomer, pre-prepared dispersant, zinc acid, initiator, and other additives are added to the reactor according to the specified amounts via a feeding pump. After feeding, the reaction control stage begins, with the temperature controlled within the range of T ± 0.5℃ and the reactor reaction pressure controlled between 0.70 and 1.00 MPa. When the reactor reaction pressure drops by 0.03 to 0.22 MPa, the terminator pump is activated to add the specified amount of terminator to the reactor to terminate the reaction. In the discharge slurry tank, monomers that did not participate in the reaction enter the compression and condensation system in gaseous form for compression and condensation recovery. The recovered monomers are stored in TK-23B to participate in the next reactor reaction. The slurry discharged to the slurry tank is pumped into a stripping tower for stripping and desorption treatment. The treated slurry is then pumped to a drying slurry tank and then pumped to a centrifuge for centrifugal drying.

[0004] Most existing suspension polymerization processes for polyvinyl chloride (PVC) employ constant temperature control, which makes it difficult to optimize the efficiency of the polymerization reaction and the quality of the product. Constant temperature control cannot fully utilize the optimal active temperature range of the initiator, resulting in long reaction times, large amounts of initiator, and high energy consumption. Therefore, a variable temperature control production device for suspension polymerization of PVC is proposed to address the above problems. Utility Model Content

[0005] The purpose of this invention is to provide a suspension-type polyvinyl chloride (PVC) temperature-controlled production device to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A temperature-controlled suspension polyvinyl chloride (PVC) production device includes a reactor. A feed pump is fixedly connected to the top of the reactor. A circulating water inlet valve and a circulating water return valve are fixedly connected to the inside of the feed pump. A drive assembly is fixedly connected to the bottom of the reactor. A stirring assembly is installed inside the drive assembly. A circulating water return pipeline system is fixedly connected to the inside of the right end of the reactor. A circulating water inlet pipeline system is fixedly connected to the inside of the left end of the reactor. A deionized water addition device and an initiator addition device are fixedly connected to the bottom of the reactor. A polyethylene monomer addition device and a terminator addition device are fixedly connected to the top of the reactor. A thermometer is fixedly connected to the inside of the reactor near the circulating water inlet pipeline system. A valve is fixedly connected to the front end of the circulating water return valve. A DCS controller is fixedly connected to the front end of the reactor.

[0008] As a further optimization of this utility model, the upper end of the reactor is provided with a feeding port, and a rubber stopper is installed inside the feeding port.

[0009] As a further optimization of this utility model, the following features are provided: Solenoid valves are installed near the reactor for both the polyethylene monomer addition device and the terminator addition device; solenoid valves are installed near the reactor for both the deionized water addition device and the initiator addition device; the circulating water supply pipeline system has multiple branch pipes, and solenoid valves are installed inside each of the multiple branch pipes; the circulating water return pipeline system has multiple branch pipes, and solenoid valves are installed inside each of the branch pipes.

[0010] As a further optimization of this utility model, the lower end of the reactor is provided with a through hole, which communicates with the interior of the reactor and is fixedly connected to the outside of the sleeve.

[0011] As a further optimization of this utility model, the stirring assembly includes a movable disc, the bottom of which is fixedly connected to the top of the drive motor housing, a central column is fixedly connected to the end of the drive motor spindle, a stirring rod is fixedly connected to the outside of the central column, an insertion hole and a rotation hole are provided on the inner side of the movable disc, a first sealing ring is fixedly connected to the inner side of the insertion hole, and a second sealing ring is fixedly connected to the inner side of the rotation hole.

[0012] As a further optimization of this utility model, the drive assembly includes a sleeve, a side seat is fixedly connected to the inner side of the sleeve, a sealing column is fixedly connected to the bottom end of the side seat, an electric telescopic rod is fixedly connected to the bottom end of the reactor, a horizontal plate is fixedly connected to the bottom end of the piston rod of the electric telescopic rod, and a housing is fixedly connected to one side of the horizontal plate.

[0013] As a further optimization of this utility model, the inner side of the fixed housing is fixedly connected to the outer side of the drive motor housing, the sealing column is inserted into the inside of the horizontal plate, the outer side of the sealing column is in contact with the inner side of the first sealing ring, and the top of the fixed housing is fixedly connected to the bottom of the movable plate.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] In this invention, by incorporating a deionized water addition device, a polyethylene monomer addition device, and an initiator addition device, the system significantly improves the efficiency and quality of polyvinyl chloride (PVC) resin production by optimizing processes such as raw material mixing, temperature control, stirring uniformity, and finished product discharge. During the raw material addition stage, the efficient mixing of the stirring components ensures the uniformity of the raw materials, providing a foundation for efficient reaction. In the polymerization reaction stage, the temperature control strategy fully utilizes the optimal active temperature range of the initiator, accelerating the reaction rate, shortening the production cycle, and reducing energy consumption. Precise temperature control during the stable reaction stage further ensures the uniformity and stability of the reaction, improving product quality. The rapid discharge design at the end of the reaction stage improves production efficiency and reduces equipment downtime. Finally, through subsequent processing steps, high-quality PVC resin products can be obtained, achieving the overall goals of efficient, energy-saving, and environmentally friendly production. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a cross-sectional structural diagram of the reaction vessel of this utility model;

[0018] Figure 3 This is a schematic diagram of the thermometer structure of this utility model;

[0019] Figure 4 This is a cross-sectional structural diagram of the stirring assembly of this utility model;

[0020] Figure 5 This is a cross-sectional structural diagram of the drive component of this utility model;

[0021] Figure 6 This utility model Figure 5 A schematic diagram of the structure at point A.

[0022] In the diagram: 1. Reactor; 2. Feed pump; 3. Circulating water inlet valve; 4. Circulating water return valve.

[0023] 5. Stirring assembly; 51. Moving disc; 52. Drive motor; 53. Central column; 54. Stirring rod; 55. Insertion hole; 56. First sealing ring; 57. Rotation hole; 58. Second sealing ring;

[0024] 6. Drive assembly; 61. Sleeve; 62. Side seat; 63. Sealing post; 64. Electric telescopic rod; 65. Horizontal plate; 66. Housing;

[0025] 7. Circulating water return pipeline system; 8. Circulating water supply pipeline system; 9. Deionized water addition device; 10. Initiator addition device; 11. Polyethylene monomer addition device; 12. Terminator addition device; 13. Thermometer; 14. Valve; 15. DCS controller. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0028] Please see Figures 1-6 This utility model provides a technical solution:

[0029] A temperature-controlled production device for suspension-process polyvinyl chloride includes a reactor 1. A feed pump 2 is fixedly connected to the top of the reactor 1. A circulating water inlet valve pipe 3 and a circulating water return valve pipe 4 are fixedly connected to the inside of the feed pump 2. A drive assembly 6 is fixedly connected to the bottom of the reactor 1. A stirring assembly 5 is installed inside the drive assembly 6. A circulating water return pipeline system 7 is fixedly connected to the inside of the right end of the reactor 1. A circulating water inlet pipeline system 8 is fixedly connected to the inside of the left end of the reactor 1. A deionized water adding device 9 and an initiator adding device 10 are fixedly connected to the bottom of the reactor 1. A polyethylene monomer adding device 11 and a terminator adding device 12 are fixedly connected to the top of the reactor 1. A thermometer 13 is fixedly connected to the inside of the reactor 1 near the circulating water inlet pipeline system 8. A valve 14 is fixedly connected to the front end of the circulating water return valve pipe 4. A DCS controller 15 is fixedly connected to the front end of the reactor 1.

[0030] As a further implementation of this scheme, a feeding port is provided at the upper end of the reactor 1. A rubber plug is installed inside the feeding port of the reactor 1. Through the above setting, by installing a rubber plug at the feeding port of the reactor 1, it is possible to effectively prevent the raw materials from being contaminated by external factors before being added. At the same time, the feeding port can be quickly sealed during the feeding process to avoid raw material leakage, ensure the safety and accuracy of the feeding process, provide a pure raw material environment for the subsequent polymerization reaction, and thus improve product quality.

[0031] As a further implementation of this scheme, solenoid valves are installed near the reactor 1 for both the polyethylene monomer addition device 11 and the terminator addition device 12. Solenoid valves are also installed near the reactor 1 for both the deionized water addition device 9 and the initiator addition device 10. The circulating water supply pipeline system 8 is equipped with multiple branch pipes, and solenoid valves are installed inside each of the multiple branch pipes of the circulating water supply pipeline system 8. The circulating water return pipeline system 7 is equipped with multiple branch pipes, and solenoid valves are installed inside each of the branch pipes of the circulating water return pipeline system 7. Through the above settings, by installing solenoid valves inside each addition device and the branch pipes of the circulating water system, precise control of the addition of raw materials and the flow rate of circulating water is achieved. During the polymerization reaction, the opening and closing degree of the solenoid valves can be quickly adjusted by the DCS controller 15 according to the temperature, pressure and other parameters inside the reactor 1, thereby precisely controlling the amount of raw materials added and the flow rate of circulating water, ensuring that the temperature and pressure inside the reactor 1 are always in the optimal state. This design not only improves the controllability and stability of the reaction, but also effectively saves energy and reduces production costs.

[0032] As a further implementation of this solution, a through hole is provided at the lower end of the reactor 1. The through hole in the reactor 1 communicates with the interior of the reactor 1 and is fixedly connected to the outside of the sleeve 61. Through the above arrangement, by providing a through hole at the lower end of the reactor 1 and fixing it to the sleeve 61, a stable structural foundation is provided for the installation of the stirring assembly 5 and the drive assembly 6. This design allows the stirring assembly 5 to penetrate deep into the interior of the reactor 1 to achieve thorough mixing of the raw materials, while ensuring the stability of the stirring assembly 5 and avoiding equipment damage or uneven mixing of raw materials due to vibration during the stirring process. In addition, the connection structure between the through hole and the sleeve 61 facilitates the installation and maintenance of the equipment, and improves the service life and reliability of the equipment.

[0033] As a further implementation of this solution, the stirring assembly 5 includes a movable disk 51. The bottom end of the movable disk 51 is fixedly connected to the top end of the housing of the drive motor 52. A central column 53 is fixedly connected to the end of the main shaft of the drive motor 52. A stirring rod 54 is fixedly connected to the outside of the central column 53. An insertion hole 55 and a rotation hole 57 are provided on the inner side of the movable disk 51. A first sealing ring 56 is fixedly connected to the inner side of the insertion hole 55, and a second sealing ring 58 is fixedly connected to the inner side of the rotation hole 57. Through the above settings, the deionized water, vinyl chloride monomer, additives and other raw materials in the reactor 1 can be quickly and thoroughly mixed to ensure that the concentration and temperature of the materials in the reactor 1 are consistent, thereby improving the efficiency of the polymerization reaction and the product quality.

[0034] As a further implementation of this solution, the drive assembly 6 includes a sleeve 61, a side seat 62 fixedly connected to the inner side of the sleeve 61, a sealing column 63 fixedly connected to the bottom end of the side seat 62, an electric telescopic rod 64 fixedly connected to the bottom end of the reactor 1, a horizontal plate 65 fixedly connected to the bottom end of the piston rod of the electric telescopic rod 64, and a fixed housing 66 fixedly connected to one side of the horizontal plate 65. With the above settings, this design can not only adjust the position of the stirring rod 54 as needed during the reaction to achieve a better mixing effect, but also quickly remove the stirring assembly 5 after the reaction, facilitating the discharge of the finished product and improving production efficiency. At the same time, the cooperation between the sealing column 63 and the insertion hole 55 can effectively prevent material leakage during the movement of the stirring assembly 5, ensuring the sealing and reliability of the equipment.

[0035] As a further implementation of this solution, the inner side of the fixed housing 66 is fixedly connected to the outer side of the drive motor 52 housing, the sealing column 63 is inserted into the inside of the horizontal plate 65, the outer side of the sealing column 63 is fitted with the inner side of the first sealing ring 56, and the top of the fixed housing 66 is fixedly connected to the bottom of the movable plate 51. Through the above settings, this design can not only effectively prevent material leakage, but also maintain a stable sealing state during the movement of the stirring assembly 5, avoiding material waste and equipment failure caused by poor sealing. At the same time, the fixed connection structure between the fixed housing 66 and the movable plate 51 ensures the stability of the stirring assembly 5 during operation, improves the operating efficiency and reliability of the equipment, and provides a strong guarantee for the production of high-quality polyvinyl chloride resin.

[0036] Workflow: I. Raw material addition stage

[0037] Deionized water is added through deionized water addition device 9, vinyl chloride monomer is added through polyethylene monomer addition device 11, and pre-prepared dispersant, zinc acid additive, and initiator additive are added through initiator addition device 10. The raw materials are added to the reactor 1 through valve 14 and feed pump 2 according to the formula. At the same time as the raw materials are added, drive motor 52 is started to drive the central column 53 to rotate. The central column 53 rotates in the rotation hole 57. The second sealing ring 58 seals the space between the central column 53 and the movable plate 51. The central column 53 drives the stirring rod 54 to rotate. The stirring rod 54 mixes the raw materials inside the reactor 1 to improve the uniformity of the raw material mixing.

[0038] II. Polymerization Reaction Initiation Stage

[0039] After the material is fed, close valve 14 on the circulating water inlet valve 3 and circulating water return valve 4 of reactor 1. The initiator in reactor 1 begins to initiate the polymerization reaction. As the heat generated by the vinyl chloride monomer reaction cannot be removed in time, the temperature continues to rise and the polymerization rate accelerates. When the temperature of reactor 1 rises by 2-4°C, open valve 14 on the circulating water inlet valve 3. Control the opening of the circulating water valve 14 through the DCS controller 15 and reduce the reaction temperature by 0.3-0.5°C every 10 minutes. After 80 minutes of reaction, the reaction temperature of reactor 1 drops to the set temperature and enters the stable reaction period. During this stage, the stirring component 5 continues to work to ensure the uniformity of the material in reactor 1.

[0040] III. Stable Reaction Phase

[0041] During the stable reaction period, the flow rate and temperature of the circulating water supply system 8 and the circulating water return system 7 are controlled by the DCS controller 15 to ensure that the temperature in the reactor 1 is always kept within the predetermined range. The polymerization reaction continues until the reactor 1 reacts for 180 minutes and the pressure drops to 0.02 MPa. At this time, the valves 14 on the circulating water supply valve 3 and the circulating water return valve 4 are closed. At this time, a small amount of initiator remains in the reactor 1. After the circulating water in the reactor 1 is turned off, the remaining initiator continues to initiate the reaction of vinyl chloride monomer. The temperature continues to rise, the polymerization reaction speed accelerates, and the conversion rate continues to increase. During this period, the stirring component 5 continues to work to ensure the uniformity of the material in the reactor 1.

[0042] IV. Reaction Completion Stage

[0043] When the temperature of reactor 1 rises by 2-4°C, valve 14 on the circulating water inlet valve 3 is fully opened to cool down the reactor through circulating water. As the temperature of reactor 1 continues to drop, the pressure of reactor 1 also drops. When the pressure of reactor 1 drops to the program set value, the formula set amount of terminator is added through terminator addition device 12 to terminate the polymerization reaction. Then, the electric telescopic rod 64 is started, which drives the horizontal plate 65 and the solid housing 66 to move downward. The solid housing 66 drives the drive motor 52 and the movable plate 51 to move downward. At this time, the stirring assembly 5 will move downward as a whole. When the inside of the insertion hole 55 is separated from the sealing column 63, the finished product inside reactor 1 flows out from the insertion hole 55 and is collected in a centralized manner.

[0044] V. Follow-up Processing Stage

[0045] The polyvinyl chloride slurry obtained from the discharge process enters subsequent processes for desorption, dehydration, and drying, ultimately yielding a finished polyvinyl chloride resin that meets the requirements.

[0046] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A suspension-process polyvinyl chloride temperature-controlled production device, comprising a reaction vessel (1), characterized in that: A feed pump (2) is fixedly connected to the top of the reactor (1). A circulating water inlet valve pipe (3) and a circulating water return valve pipe (4) are fixedly connected to the inside of the feed pump (2). A drive assembly (6) is fixedly connected to the bottom of the reactor (1). A stirring assembly (5) is installed inside the drive assembly (6). A circulating water return pipeline system (7) is fixedly connected to the inside of the right end of the reactor (1). A circulating water inlet pipeline system (8) is fixedly connected to the inside of the left end of the reactor (1). The reactor (1) is fixedly connected to a deionized water addition device (9) and an initiator addition device (10) at the lower end. The reactor (1) is fixedly connected to a polyethylene monomer addition device (11) and a terminator addition device (12) at the upper end. The reactor (1) is fixedly connected to a thermometer (13) on the inner side near the circulating water supply pipeline system (8). The circulating water return valve (4) is fixedly connected to a valve (14). The reactor (1) is fixedly connected to a DCS controller (15) at the front end.

2. The suspension-process polyvinyl chloride temperature-controlled production device according to claim 1, characterized in that: The upper end of the reactor (1) is provided with a feeding port, and a rubber stopper is installed inside the feeding port of the reactor (1).

3. The suspension-process polyvinyl chloride temperature-controlled production device according to claim 1, characterized in that: Solenoid valves are installed near the reactor (1) for both the polyethylene monomer addition device (11) and the terminator addition device (12). Solenoid valves are installed near the reactor (1) for both the deionized water addition device (9) and the initiator addition device (10). Solenoid valves are installed in both the circulating water supply pipeline system (8) and the circulating water supply pipeline system (8). Solenoid valves are installed inside both of the multiple branch pipes of the circulating water supply pipeline system (8). Solenoid valves are installed in both the circulating water return pipeline system (7) and the circulating water return pipeline system (7).

4. The suspension-process polyvinyl chloride temperature-controlled production device according to claim 1, characterized in that: The reactor (1) has a through hole at its lower end. The through hole is connected to the interior of the reactor (1) and is fixedly connected to the outside of the sleeve (61).

5. The suspension-process polyvinyl chloride temperature-controlled production device according to claim 1, characterized in that: The stirring assembly (5) includes a movable disc (51), the bottom end of which is fixedly connected to the top end of the housing of the drive motor (52), a central column (53) is fixedly connected to the end of the main shaft of the drive motor (52), a stirring rod (54) is fixedly connected to the outside of the central column (53), and a plug hole (55) and a rotating hole (57) are provided on the inner side of the movable disc (51). A first sealing ring (56) is fixedly connected to the inner side of the plug hole (55), and a second sealing ring (58) is fixedly connected to the inner side of the rotating hole (57).

6. The suspension-process polyvinyl chloride temperature-controlled production device according to claim 1, characterized in that: The drive assembly (6) includes a sleeve (61), a side seat (62) is fixedly connected to the inner side of the sleeve (61), a sealing column (63) is fixedly connected to the bottom end of the side seat (62), an electric telescopic rod (64) is fixedly connected to the bottom end of the reactor (1), a horizontal plate (65) is fixedly connected to the bottom end of the piston rod of the electric telescopic rod (64), and a solid housing (66) is fixedly connected to one side of the horizontal plate (65).

7. The suspension-process polyvinyl chloride temperature-controlled production device according to claim 6, characterized in that: The inner side of the fixed housing (66) is fixedly connected to the outer side of the housing of the drive motor (52), the sealing column (63) is inserted into the inside of the horizontal plate (65), the outer side of the sealing column (63) is in contact with the inner side of the first sealing ring (56), and the top of the fixed housing (66) is fixedly connected to the bottom of the movable plate (51).

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