Batch polymerization process tower pressure control system
By installing pressure transmitters and multi-stage coolers on the process tower, combined with controllers and pressure regulating valves, the problem of improper pressure control in the batch polymerization process tower was solved, improving the esterification reaction efficiency and product quality, and enhancing the system's adaptability and reliability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-31
- Publication Date
- 2026-03-06
AI Technical Summary
Existing technologies cannot effectively control the pressure of batch polymerization towers, affecting esterification reaction efficiency and the quality of esterification products. Furthermore, they are difficult to deal with equipment failures, leading to equipment damage and a decline in product quality.
Pressure transmitters and multi-stage coolers are installed on the process tower, along with controllers and pressure regulating valves, to achieve precise regulation of the pressure inside the process tower and improve the cooling effect. The gas flow rate is also adjusted by controlling the bypass and vacuum pump, thereby enhancing the flexibility and reliability of the system.
It achieves precise control of pressure within the process tower, improves esterification reaction efficiency and product quality, reduces the impact of human factors, ensures production stability and safety, and enhances the system's adaptability and reliability.
Smart Images
Figure CN223969958U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of chemical production technology, specifically to a pressure control system for an intermittent polymerization process tower. Background Technology
[0002] In chemical production processes, batch polymerization process towers are connected to esterification reactors to handle volatile gases generated during the esterification reaction. These towers are key equipment for separating and purifying the reaction products. During esterification, volatile gases from the esterification reactor enter the process tower for heat exchange. High-boiling-point gases condense inside the tower and return to the esterification reactor for further reaction, while low-boiling-point gases are vaporized from the top of the tower, further cooled by a cooler, and stored in a reflux tank. During this process, it is crucial to regulate the gas pressure promptly to avoid large pressure fluctuations that could affect the esterification reaction efficiency and the quality of the esterified products. In existing technologies, a pressure regulating valve is installed at the gas phase outlet of the cooler at the top of the tower, and a pressure transmitter is installed at the top of the esterification reactor. Pressure control is achieved by measuring the opening of the regulating valve within the reactor using the pressure transmitter. However, this technical solution cannot effectively control the pressure inside the process tower during actual production, affecting the separation and purification effects, and consequently impacting the esterification reaction efficiency and the quality of the esterified products. Moreover, during the reaction process, it is difficult to effectively deal with emergencies such as equipment failure, which can lead to equipment damage, shorten equipment lifespan, affect the normal progress of the reaction, and reduce the quality of esterification products. Utility Model Content
[0003] This invention provides a pressure control system for a batch polymerization process tower, which can solve the problem of ineffective pressure control in a batch polymerization process tower, affecting the efficiency of the esterification reaction and the quality of the esterification products.
[0004] This application provides the following technical solution:
[0005] A pressure control system for an intermittent polymerization process tower includes a process tower, the inlet of which is connected to the outlet of an esterification reactor, a pressure transmitter on the process tower, the outlet of which is connected to the inlet of a multi-stage cooler, the outlet of which is connected to the medium inlet of a reflux tank, a control bypass between the inlet and outlet of each stage of the cooler, an exhaust pipe at the outlet of the reflux tank, a pressure regulating valve on the exhaust pipe, and the pressure transmitter and the pressure regulating valve connected to a controller.
[0006] Beneficial Effects: A pressure transmitter installed on the process tower enables real-time and accurate monitoring of pressure changes within the tower. The transmitter transmits the pressure signal to the controller, which precisely controls the opening of the pressure regulating valve based on the tower pressure, achieving precise pressure regulation and improving product quality and production efficiency. The tower's outlet is connected to a multi-stage cooler, which gradually cools the high-temperature gas exiting the tower, enhancing cooling efficiency and ensuring that condensable components in the gas fully condense into liquid, facilitating subsequent separation and processing. Simultaneously, control bypasses are provided between the inlet and outlet of each cooler stage. By opening and closing these bypasses or adjusting their flow rate, the gas flow rate entering each cooler can be flexibly adjusted, improving the adaptability and reliability of the cooling system. This technical solution enables automated operation, reducing the impact of human factors on the production process, improving operational simplicity and accuracy, and ensuring esterification reaction efficiency and the quality of esterification products.
[0007] Furthermore, the multi-stage cooler includes at least a primary cooler and a secondary cooler. The medium inlet of the primary cooler is connected to the gas outlet of the process tower via a pipeline, and the medium outlet of the primary cooler is connected to the medium inlet of the secondary cooler via a pipeline. The medium outlet of the secondary cooler is connected to the medium inlet of the reflux tank via a pipeline. A first pressure transmitter is installed on the pipeline near the medium inlet of the primary cooler, and a second pressure transmitter and a first temperature sensor are installed on the pipeline near the medium outlet of the primary cooler. A primary control bypass is provided between the medium inlet and the medium outlet of the primary cooler, and a primary control valve is provided between the medium inlet of the primary cooler and the inlet end of the primary control bypass. A primary bypass control valve is provided on the primary control bypass. A third pressure transmitter and a second temperature sensor are installed on the pipeline near the medium outlet of the secondary cooler. A secondary control bypass is provided between the medium inlet and the medium outlet of the secondary cooler, and a secondary control valve is provided between the medium inlet of the secondary cooler and the inlet end of the secondary control bypass. A secondary bypass control valve is provided on the secondary control bypass.
[0008] Beneficial effects: By monitoring pressure changes at both ends of each stage of the cooler, problems such as blockages and leaks can be detected promptly, allowing for appropriate maintenance and adjustments to ensure the normal operation of the cooling system. Real-time monitoring of the cooled gas temperature enables precise temperature control, ensuring that the gas temperature entering the reflux tank meets process requirements, thus improving product quality and production stability.
[0009] Furthermore, the first pressure transmitter, the second pressure transmitter, the third pressure transmitter, the first temperature sensor, the second temperature sensor, the primary control valve, the primary bypass control valve, the secondary control valve, and the secondary bypass control valve are respectively connected to the controller.
[0010] Beneficial effects: Reduces the impact of human factors on the production process, and enables automated and intelligent management of the production process.
[0011] Furthermore, a gas phase branch is provided between the gas outlet of the esterification reactor and the inlet of the multi-stage cooler, and a gas phase regulating valve is provided on the gas phase branch.
[0012] Beneficial effects: The inclusion of a gas phase branch and a gas phase regulating valve increases the system's flexibility and adjustability. If the process tower or esterification reactor malfunctions, emergency pressure relief of the esterification reactor can be achieved through the gas phase branch, ensuring equipment safety.
[0013] Furthermore, an air extraction pipeline is provided between the return tank and the pressure regulating valve on the exhaust pipeline, and a vacuum regulating valve and a vacuum pump are provided on the air extraction pipeline.
[0014] Beneficial effects: By combining a vacuum pump and a vacuum regulating valve, the vacuum level of the esterification reactor and process tower can be precisely adjusted, making it suitable for esterification reactions that require a negative pressure environment and improving the applicability of the entire system.
[0015] Furthermore, a safety valve is installed on the exhaust pipe.
[0016] Beneficial effects: It can automatically open when the system pressure exceeds the set value, preventing serious accidents such as rupture and explosion of equipment such as process towers and reflux tanks due to excessive pressure, and providing key protection for equipment and personnel safety.
[0017] Furthermore, the liquid phase outlet of the reflux tank is connected to the reflux port at the top of the process tower.
[0018] Beneficial effects: It can effectively reduce the temperature inside the process tower, make the temperature distribution inside the tower more uniform, avoid local overheating, help maintain stable process conditions, and ensure product quality.
[0019] Furthermore, the exhaust pipe is connected to the waste gas treatment device.
[0020] Beneficial effects: It can effectively treat the waste gas generated during the production process, remove harmful substances, and protect the environment. Attached Figure Description
[0021] Figure 1 This is a schematic diagram of a first embodiment of the intermittent polymerization process tower pressure control system of this utility model.
[0022] Figure 2 This is a schematic diagram of a second embodiment of the intermittent polymerization process tower pressure control system of this utility model. Detailed Implementation
[0023] The following detailed description illustrates the specific implementation method:
[0024] The markings in the accompanying drawings include: esterification reactor 1, process tower 2, primary cooler 3, secondary cooler 4, reflux tank 5, waste gas treatment device 6; esterification reactor pressure transmitter P1, process tower pressure transmitter P2, first pressure transmitter P3, second pressure transmitter P4, third pressure transmitter P5, process tower temperature sensor T1, first temperature sensor T2, second temperature sensor T3, primary control valve V1, primary bypass control valve V2, secondary control valve V3, secondary bypass control valve V4, pressure regulating valve V5, safety valve V6, vacuum regulating valve V7, and gas phase regulating valve V8.
[0025] Example 1
[0026] like Figure 1As shown, a pressure control system for an intermittent polymerization process tower 2 includes a process tower 2. The inlet of the process tower 2 is connected to the outlet of an esterification reactor 1. An esterification reactor pressure transmitter P1 is installed on the esterification reactor 1. A process tower pressure transmitter P2 and a process tower temperature sensor T1 are installed on the process tower 2. The outlet of the process tower 2 is connected to the inlet of a multi-stage cooler. The outlet of the multi-stage cooler is connected to the medium inlet of a reflux tank 5. Pressure transmitters are installed at the inlet and outlet of each stage of the cooler. A control bypass is provided between the inlet and outlet of each stage of the cooler. Specifically, the multi-stage cooler includes at least a primary cooler 3 and a secondary cooler 4. The medium inlet of the primary cooler 3 is connected to the outlet of the process tower 2 via a pipeline, and the medium outlet of the primary cooler 3 is connected to the medium inlet of the secondary cooler 4 via a pipeline. The medium outlet of the secondary cooler 4 is connected to the medium inlet of the reflux tank 5 via a pipeline. A first pressure transmitter P3 is installed on the pipeline near the medium inlet of the primary cooler 3, and a second pressure transmitter P4 and a first temperature sensor T2 are installed on the pipeline near the medium outlet of the primary cooler 3. The medium of the primary cooler 3... A primary control bypass is provided between the inlet and the outlet of the medium. A primary control valve V1 is installed between the medium inlet of the primary cooler 3 and the inlet end of the primary control bypass, and a primary bypass control valve V2 is installed on the primary control bypass. A third pressure transmitter P5 and a second temperature sensor T3 are installed on the pipeline near the medium outlet of the secondary cooler 4. A secondary control bypass is provided between the medium inlet and the outlet of the secondary cooler 4. A secondary control valve V3 is installed between the medium inlet of the secondary cooler 4 and the inlet end of the secondary control bypass, and a secondary bypass control valve V4 is installed on the secondary control bypass. An exhaust pipe is provided at the outlet of the reflux tank 5, and a pressure regulating valve V5 is installed on the exhaust pipe. A safety valve V6 is installed on the exhaust pipe. The pressure transmitters P1 and P2 of the esterification reactor, T1 of the process column, P3, P4, and P5 of the first and third pressure transmitters, T2 and T3 of the first and second temperature sensors, V1 of the primary control valve, V2 of the primary bypass control valve, V3 of the secondary control valve, V4 of the secondary bypass control valve, and V5 of the pressure regulating valve are all connected to the controller. The opening degree of the pressure regulating valve V5 is controlled by the pressure value inside process column 2 detected by the process column pressure transmitter P2.
[0027] The operating mode of the pressure control system for intermittent polymerization tower 2 is as follows:
[0028] During the esterification reaction, the volatile gases generated in the esterification reactor 1 enter the process tower 2 through pipelines for heat exchange. High-boiling-point gases form condensate inside the process tower, while low-boiling-point gases are extracted from the top of the process tower 2. After cooling in a cooler, the resulting liquid enters the reflux tank 5, and the gas is discharged through the exhaust pipeline. The controller monitors the temperature and pressure inside the process tower 2 and pipelines in real time via the esterification reactor pressure transmitter P1, the process tower pressure transmitter P2, the process tower temperature sensor T1, the first pressure transmitter P3, the second pressure transmitter P4, and the third pressure transmitter P5. Based on the pressure and temperature thresholds set in the controller, it controls the closing, opening, and opening degree of the primary control valve V1, the primary bypass control valve V2, the secondary control valve V3, the secondary bypass control valve V4, and the pressure regulating valve V5, thereby controlling the pressure and temperature inside the process tower and pipelines to ensure the efficiency of the esterification reaction and the quality of the esterification products.
[0029] Under normal operating conditions, the pressure values detected by each pressure transmitter are decreasing. The pressure values detected by the process tower pressure transmitter P2 are greater than or equal to the first pressure transmitter P3, which is greater than the second pressure transmitter P4, which is greater than the third pressure transmitter P5. The temperature values detected by the first temperature sensor T2 and the second temperature sensor T3 are both within the temperature threshold range. The controller controls the opening of the pressure regulating valve V5 according to the set normal pressure threshold.
[0030] When the cooler malfunctions, the medium enters the next stage cooling circuit through the control bypass. If the first stage cooler 3 malfunctions, the pressure value of the first pressure transmitter P3 is less than the pressure value of the second pressure transmitter P4. The controller controls the first stage control valve V1 to close, the first stage bypass control valve V2 to open, and controls the opening of the pressure regulating valve V5 according to the set abnormal pressure threshold.
[0031] When the cooling circuit of the cooler malfunctions and the temperature sensor detects a temperature value outside the temperature threshold range, making it impossible to effectively cool the medium, the medium enters the next stage cooling circuit through the control bypass. If the first-stage cooler 3 malfunctions, the controller controls the first-stage control valve V1 to close, the first-stage bypass control valve V2 to open, and controls the opening of the pressure regulating valve V5 according to the set abnormal pressure threshold.
[0032] Depending on the actual response requirements, the primary or secondary cooler can be turned on or off to improve applicability.
[0033] Example 2
[0034] like Figure 2 As shown, the difference between this embodiment and Embodiment 1 is that a gas phase branch is provided between the gas outlet of the esterification reactor 1 and the medium inlet of the cooler, and a gas phase regulating valve V8 is provided on the gas phase branch.
[0035] Example 3
[0036] like Figure 2 As shown, the difference between this embodiment and Embodiment 1 is that an extraction pipeline is provided between the return tank 5 and the pressure regulating valve V5 on the exhaust pipeline, and a vacuum regulating valve V7 and a vacuum pump are provided on the extraction pipeline. The exhaust pipeline and the extraction pipeline are respectively connected to the waste gas treatment device 6.
[0037] Example 4
[0038] like Figure 2 As shown, the difference between this embodiment and embodiment three is that the liquid phase outlet of the reflux tank 5 is connected to the reflux port at the top of the process tower 2 through a reflux pump.
[0039] The above are merely embodiments of this utility model, and the utility model is not limited to the field covered by this embodiment. Commonly known structures and characteristics in the solutions are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of this utility model, and these should also be considered within the scope of protection of this utility model. These modifications will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.
Claims
1. An intermittent polymerization process column pressure control system comprising a process column, the inlet of the process column is connected with the outlet of an esterification kettle, characterized in that, The process column is provided with a pressure transmitter, and the gas outlet of the process column is connected with the inlet end of the multi-stage cooler, and the outlet end of the multi-stage cooler is connected with the medium inlet of the reflux tank, and the inlet end and the outlet end of each stage cooler are provided with a control bypass, the gas outlet of the reflux tank is provided with an exhaust pipeline, and the exhaust pipeline is provided with a pressure regulating valve, and the pressure transmitter and the pressure regulating valve are connected with the controller respectively.
2. The batch polymerization process column pressure control system of claim 1, wherein: The multi-stage cooler at least includes a first-stage cooler and a second-stage cooler, the medium inlet of the first-stage cooler is connected with the gas outlet of the process column through a pipeline, the medium outlet of the first-stage cooler is connected with the medium inlet of the second-stage cooler through a pipeline, and the medium outlet of the second-stage cooler is connected with the medium inlet of the reflux tank through a pipeline; the pipeline close to the medium inlet of the first-stage cooler is provided with a first pressure transmitter, the pipeline close to the medium outlet of the first-stage cooler is provided with a second pressure transmitter and a first temperature sensor, the medium inlet and the medium outlet of the first-stage cooler are provided with a first-stage control bypass, the medium inlet of the first-stage cooler and the inlet end of the first-stage control bypass are provided with a first-stage control valve, and the first-stage control bypass is provided with a first-stage bypass control valve; the pipeline close to the medium outlet of the second-stage cooler is provided with a third pressure transmitter and a second temperature sensor, the medium inlet and the medium outlet of the second-stage cooler are provided with a second-stage control bypass, the medium inlet of the second-stage cooler and the inlet end of the second-stage control bypass are provided with a second-stage control valve, and the second-stage control bypass is provided with a second-stage bypass control valve.
3. The batch polymerization process column pressure control system of claim 2, wherein: The first pressure transmitter, the second pressure transmitter, the third pressure transmitter, the first temperature sensor, the second temperature sensor, the first-stage control valve, the first-stage bypass control valve, the second-stage control valve and the second-stage bypass control valve are connected with the controller respectively.
4. The batch polymerization process column pressure control system of claim 1, wherein: The gas phase branch is provided between the gas outlet of the esterification kettle and the inlet end of the multi-stage cooler, and the gas phase branch is provided with a gas phase regulating valve.
5. The batch polymerization process column pressure control system of claim 1, wherein: The exhaust pipeline is provided with an exhaust pipeline between the reflux tank and the pressure regulating valve, and the exhaust pipeline is provided with a vacuum regulating valve and a vacuum pump.
6. The batch polymerization process column pressure control system of claim 1, wherein: The exhaust pipeline is provided with a safety valve.
7. The batch polymerization process column pressure control system of claim 1, wherein: The liquid phase outlet of the reflux tank is connected with the reflux port of the upper end of the process column.
8. The batch polymerization process column pressure control system of claim 1, wherein: The exhaust pipeline is connected with the waste gas treatment device.