A paste resin seed emulsion method condenser device

Abstract

The utility model discloses a kind of paste resin seed emulsion method condenser device, it is related to resin production equipment technical field, including the condenser kettle body being located at the upper end of polymerizer, the condenser kettle body includes array in interior's tube and is located at the upper end of the tube flushing pipe, the flushing pipe is connected with flushing pump and flushing medium by pipeline, the tube is connected with heat exchange upper water pipe and heat exchange backwater pipe, recovery gas pipe is equipped on the condenser kettle body, the emptying pipeline is equipped in the lower end of the condenser kettle body. Condenser kettle body is heated by the tube of polymerizer upper end, flushing pipe connects flushing pump and injects medium into tube cleaning, recovery gas pipe collects volatile gas, emptying pipeline discharges waste liquid, realize heat exchange, flushing, discharge integration, compact structure and can actively remove tube inner wall plasticizing, significantly reduce the risk of blockage, the whole device structure is compact, easy to operate, reduce downtime.

Description

Technical Field

[0001] This utility model relates to the technical field of resin production equipment. Background Technology

[0002] Seed emulsion polymerization is an emulsion polymerization process specifically designed for producing polyvinyl chloride (PVC) paste resins with specific structures. Its core lies in stepwise polymerization, utilizing pre-synthesized polymer particles (seeds) as "templates" or "cores" to guide subsequent polymerization and form PVC resins with ideal particle morphology and internal structure. This produces PVC resins suitable for plasticized pastes and organosol applications. After the resin powder is dispersed in a plasticizer or solvent, the resulting paste (paste resin) needs to have low initial viscosity and good processing rheology. The key to achieving this is controlling the morphology and structure of the resin particles, requiring the formation of loose, porous aggregated particles. This structure facilitates rapid penetration of the plasticizer into the particle interior, reducing paste viscosity. Typically, a small-scale conventional emulsion polymerization is carried out in a reactor. The polymerization reaction produces very fine, uniformly distributed PVC latex particles—these are the "seeds."

[0003] In the production of paste resins in the chemical industry, heat exchange during the polymerization reaction is mainly accomplished through the polymerization reactor jacket and condenser. Foaming and self-polymerization during the polymerization reaction can clog the condenser, affecting heat exchange efficiency and severely impacting the process control of seed emulsion paste resin production. This manifests primarily in increased control difficulty, poor condenser heat exchange efficiency, inadequate condenser flushing, high frequency and long cleaning cycles, water waste during condenser flushing, harsh on-site working environment, ineffective control of inherent safety, high labor intensity, and reduced output and efficiency. These factors put significant pressure on enterprise safety operations, leading to resource waste, reduced production efficiency, and ultimately, decreased economic benefits. Utility Model Content

[0004] To address the aforementioned technical problems, the present invention aims to provide a condenser device for the seed emulsion method of paste resin production, effectively solving the problem of condenser blockage during the seed emulsion method of paste resin production and improving equipment utilization.

[0005] To achieve the above objectives, this utility model specifically adopts the following technical solution:

[0006] A condenser device for the seed emulsion method of resin paste includes a condenser body located at the upper end of a polymerization reactor. The condenser body includes a row of tubes arranged inside and a flushing pipe located at the upper end of the row of tubes. The flushing pipe is connected to a flushing pump and a flushing medium via a pipeline. The row of tubes is connected to a heat exchange water inlet pipe and a heat exchange water return pipe. A gas recovery pipe is provided on the condenser body, and an venting pipe is provided at the lower end of the condenser body.

[0007] With the above scheme, the condenser vessel exchanges heat through the tubes at the top of the polymerization vessel. The flushing pipe is connected to the flushing pump to inject the medium into the tubes for cleaning. The recovery gas pipe collects volatile gases, and the venting pipe discharges waste liquid, realizing the integration of heat exchange, flushing and discharge. The structure is compact and can actively remove plastics from the inner wall of the tubes, significantly reducing the risk of blockage. The whole device is compact, easy to operate, and reduces downtime.

[0008] Furthermore, the rinsing pipe is provided with several spray heads, which are spiral spray heads evenly distributed on the rinsing pipe.

[0009] Through the above solution, the spiral nozzle generates a rotating jet during rinsing, which evenly covers the inner wall surface along the tube axis. The rotating water flow forms a vortex shear force, which completely removes the adhering plastics, eliminates cleaning dead corners, and improves the efficiency of a single rinse.

[0010] Furthermore, at least two flushing pumps are provided, and multiple flushing pumps are connected in parallel with flushing medium and flushing pipes.

[0011] The above scheme allows multiple flushing pumps to operate in parallel, simultaneously delivering high-pressure media to the flushing pipe to create pressure superposition, breaking through the flow limit of a single pump and providing peak flushing pressure to ensure the breakage of the plasticized layer; the system can still operate at a reduced frequency in the event of a single pump failure, ensuring continuity.

[0012] Furthermore, the single-pump flow rate of the flushing pump is 43m³ / h. 3 / h, total flushing water volume 3m³ 3 ~5m 3 .

[0013] Through the above scheme, a single pump can output a constant flow rate of 43 m³ / h, while multiple pumps working together can achieve a total flushing volume of 3–5 m³ / h. 3 The pulsed water flow precisely controls water consumption, reducing wastewater generation while ensuring flushing power.

[0014] Furthermore, the temperature of the flushing medium transported in the flushing pipe is between 35°C and 85°C.

[0015] Through the above scheme, the temperature of the flushing medium in the flushing pipe can be dynamically adjusted between 35 and 85°C. The high-temperature section (65 to 85°C) enhances the flushing effect and melts the adhesion, while the low-temperature section (35 to 50°C) saves energy consumption for heating the flushing medium.

[0016] The beneficial effects of this utility model are as follows:

[0017] This application has a simple structure. By modifying the structure and size of the flushing pipeline and nozzles of the reactor top condenser, adjusting the flushing control method and flushing water volume, and adjusting the flushing medium temperature of the reactor top condenser, the internal plasticization and self-polymerization of the reactor top condenser are optimized and improved. This achieves the following results: improved condenser heat exchange effect, improved condenser flushing effect, extended condenser cleaning frequency, improved working environment, and ensured inherently safe production. It effectively solves the problem of condenser blockage in the production of paste resin by the seed emulsion method and improves equipment utilization. Attached Figure Description

[0018] Figure 1 This is a system schematic diagram of the present invention;

[0019] Reference numerals in the attached drawings: 1. Polymerization vessel; 2. Condenser vessel body; 3. Flushing pipe; 4. Flushing medium; 5. Recovery gas pipe; 6. Spiral nozzle; 7. Heat exchange return water pipe; 8. Heat exchange supply water pipe; 9. Drainage pipe; 10. Tube; 11. Flushing pump. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0022] like Figure 1 As shown, this embodiment provides a condenser device for the seed emulsion method of resin paste, including a condenser body 2 disposed on the upper end of a polymerization reactor 1. The condenser body 2 includes a series of tubes 10 arranged inside and a flushing pipe 3 disposed on the upper end of the series of tubes 10. Several spray heads are distributed on the flushing pipe 3. The spray heads are spiral spray heads 6, which are evenly distributed on the flushing pipe 3. The flushing pipe 3 is connected to a flushing pump 11 and a flushing medium 4 through a pipe. The series of tubes 10 are connected to a heat exchange water supply pipe 8 and a heat exchange water return pipe 7. A recovery gas pipe 5 is disposed on the condenser body 2, and an vent pipe 9 is disposed at the lower end of the condenser body 2.

[0023] Therefore, the condenser vessel 2 exchanges heat through the tubes 10 at the upper end of the polymerization vessel 1. The flushing pipe 3 is connected to the flushing pump 11 to inject the medium into the tubes 10 for cleaning. The spiral nozzle 6 generates a rotating jet during flushing, which evenly covers the inner wall surface along the axial direction of the tubes 10. The rotating water flow forms a vortex shear force, which completely peels off the adhering plastics, eliminates cleaning dead corners, and improves the efficiency of a single flush. The recovery gas pipe 5 collects volatile gases, and the exhaust pipe 9 discharges waste liquid, realizing the integration of heat exchange, flushing, and discharge. The structure is compact and can actively remove plastics from the inner wall of the tubes 10, significantly reducing the risk of blockage. The entire device has a compact structure, is easy to operate, and reduces downtime.

[0024] At least two flushing pumps 11 are provided, and multiple flushing pumps 11 are connected in parallel with flushing medium 4 and flushing pipe 3. In this embodiment, two flushing pumps 11 are provided, and the flow rate of a single flushing pump 11 is 43 m³ / h. 3 / h, total flushing water volume 3m³ 3 ~5m 3 Multiple flushing pumps 11 operate in parallel, simultaneously delivering high-pressure media to flushing pipe 3 to create pressure superposition, breaking through the flow limit of a single pump and providing peak flushing pressure to ensure the breakage of the plasticized layer; when a single pump fails, the system can still operate at a reduced frequency to ensure continuity, with a constant flow output of 43 m3 / h for a single pump, and multiple pumps working together to achieve a pulsed water flow with a total flushing volume of 3 to 5 m3, accurately controlling water consumption and reducing wastewater generation while ensuring flushing force.

[0025] Traditional condensers can be modified, and the modification effects are shown in the table below.

[0026] Table: Comparison of Modifications to the Top Condenser of Polymerization Reactor 1

[0027]

[0028] As can be seen from the table above, this application mainly focuses on the invention and application of a technology for preventing plasticization and self-polymerization in the condenser of a paste resin seed emulsion process. This involves modifying the length of the flushing pipe 3, adjusting the flushing water flow rate and control, modifying the spray nozzles, and adjusting the temperature of the flushing medium 4 to improve the working environment, ensure inherently safe production, and reduce resource waste. It effectively solves the difficulty of condenser blockage in the paste resin production process of the seed emulsion method, increasing the blockage from 16-25 batches per cycle to 60-70 batches per cycle. This significantly improves the condenser's anti-plasticization and anti-self-polymerization time, reduces the monthly cleaning frequency by about 10 times, saves maintenance time annually, and increases production by 55 batches per year. It also increases the annual production of polymerization reactor 1 by 600 tons of product.

[0029] This embodiment also provides a process for preventing plasticization and self-polymerization in a paste resin seed emulsion condenser, applied to the above-mentioned condenser device, including the following steps:

[0030] Step S1, phased flushing control: During the polymerization reaction, the condenser flushing program is dynamically activated according to the reaction stage;

[0031] Step S2, high-pressure pulse flushing: High-pressure flushing medium 4 is injected into the tube 10 through flushing pump 11, with a flushing flow rate of 43m3 / h to 75m3 / h and a total flushing volume of 3m3 to 5m3.

[0032] Step S3, Temperature Coordination and Control: During the rinsing stage, the temperature of the rinsing medium 4 is simultaneously adjusted to 35℃~85℃, and the temperature is adjusted according to the adhesion. The more adhesion, the higher the temperature.

[0033] Step S4, rinsing medium 4 recovery: The plasticized liquid after rinsing is guided to the wastewater treatment system through the drain pipe 9, and the generated organic waste gas is recovered through the recovery gas pipe 5.

[0034] Furthermore, the triggering conditions for dynamic flushing in step S1 include:

[0035] a. When the polymerization conversion rate reaches 50%–70%;

[0036] b. The condenser heat exchange efficiency drops to below 80% of the design value;

[0037] c. Perform a rinsing at least once every 60 batches of reaction.

[0038] The specific operation of high-pressure flushing in step S2 is as follows:

[0039] Start at least two flushing pumps 11 connected in parallel to form superimposed flushing pressure;

[0040] A rotating jet is generated by the spiral nozzle 6, covering the entire circumference of the inner wall of the tube 10.

[0041] Each rinse lasts 30 to 90 seconds.

[0042] Precise intervention based on the reaction state avoids over-rinsing, reduces the frequency of rinsing, minimizes ineffective rinsing, and increases production capacity. High-pressure rinsing (S1) is triggered in stages, combined with temperature control (S3) to inhibit plasticization. Waste liquid is discharged through vent pipe (S4), and waste gas is collected through recovery gas pipe (5). This four-step closed-loop process solves the blockage problem, ensuring a stable condenser heat exchange efficiency of >95%. The cleaning cycle is extended from 18 batches / time to 60 batches / time. Short-duration, high-intensity rinsing completely removes the plasticized layer, reducing the time required per rinse and minimizing the impact on production.

[0043] Implementation Principle: By modifying the structural dimensions and nozzles of the flushing pipe 3 line of the top condenser, adjusting the flushing control method and flushing water volume, and adjusting the flushing medium 4 temperature of the top condenser of polymerization reactor 1, the internal plasticization and self-polymerization of the top condenser are improved, significantly reducing the cleaning frequency of the top condenser, reducing the frequency of shutdown for cleaning, improving production efficiency, optimizing and improving the internal plasticization and self-polymerization of the top condenser, thereby improving the condenser heat exchange effect, condenser flushing effect, extending the condenser cleaning frequency, improving the working environment, ensuring inherently safe production, effectively solving the problem of condenser blockage in the production of paste resin by the seed emulsion method, and improving equipment utilization.

[0044] It should be noted that the connection relationships of components not specifically mentioned in this application are all assumed to be based on existing technology. Since they do not involve the inventive point and are commonly used in existing technology, the structural connection relationships are not described in detail.

Claims

1. A paste resin seed emulsion process condenser apparatus characterized by, The condenser body (2) is located at the top of the polymerization reactor (1). The condenser body (2) includes a series of tubes (10) arranged inside and a flushing pipe (3) located at the top of the series of tubes (10). The flushing pipe (3) is connected to a flushing pump (11) and a flushing medium (4) through a pipeline. The series of tubes (10) are connected to a heat exchange water supply pipe (8) and a heat exchange water return pipe (7). The condenser body (2) is provided with a gas recovery pipe (5). The condenser body (2) is provided with an venting pipe (9) at the bottom.

2. A paste resin seed emulsion process condenser apparatus according to claim 1, characterized by, The rinsing pipe (3) is provided with several spray heads, and the spray heads are spiral spray heads (6) evenly distributed on the rinsing pipe (3).

3. A paste resin seed emulsion process condenser apparatus as defined in claim 1, wherein, At least two flushing pumps (11) are provided, and multiple flushing pumps (11) are connected in parallel with flushing medium (4) and flushing pipe (3).

4. A paste resin seed emulsion process condenser apparatus according to claim 3, wherein The flush pump (11) has a single pump flow of 43 m 3 / h, and a total flush water volume of 3 m 3 ~ 5 m 3 .

5. A paste resin seed emulsion process condenser apparatus as defined in claim 1, wherein, The temperature of the flushing medium (4) in the flushing pipe (3) is between 35℃ and 85℃.

Images