Polymerization inhibitor adding device and polymerization reaction system

Abstract

The utility model relates to a polymerization inhibitor adding device and a polymerization reaction system, and the polymerization inhibitor adding device comprises a preparation tank, a first passage which is arranged at the bottom of the preparation tank and is communicated with a reaction kettle, a plurality of branch passages which are communicated with the first passage and a sampling bottle, and an alarm interlocking assembly which is used for monitoring whether a polymerization inhibitor leaks in the sampling bottle, a first cut-off assembly and a multi-pass steering assembly which are interlocked with the temperature in the reaction kettle are arranged on the first passage; the plurality of branch passages comprise a first branch passage which is communicated with the first passage and the sampling bottle through the multi-way steering assembly. When the first cut-off assembly breaks down, the multi-way rotating assembly serves as a second layer of protection to lead leaked polymerization inhibitors to the sampling bottle, the polymerization inhibitors are prevented from directly flowing to the reaction kettle, and meanwhile an alarm is given after gas volatilized by the polymerization inhibitors in the sampling bottle is monitored. In addition, whether the polymerization inhibitor is separated out of the solution and blocks the pipeline or not is detected through sampling of the second branch channel, and the quality of the polymerization inhibitor is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of chemical production additives technology, and in particular to a polymerization inhibitor addition device and a polymerization reaction system. Background Technology

[0002] Polymerization reactions, especially bulk polymerization, can exhibit self-acceleration, leading to explosive polymerization of the entire reaction system. This generates a large amount of heat in a very short time, potentially causing accidents such as fires and explosions. According to relevant standards and regulations, an emergency polymerization inhibitor addition system must be installed on the reactor to minimize the hazards caused by explosive polymerization.

[0003] Currently, the commonly used method for adding polymerization inhibitors in production involves installing a small preparation tank on top of the reactor. A pre-prepared inhibitor solution of a specific dosage is then added. When explosive polymerization occurs, an automatic shut-off valve at the bottom of the preparation tank is opened, allowing the inhibitor to be added. However, if the automatic shut-off valve malfunctions and leaks internally, the inhibitor can slowly flow into the reactor during production, damaging the quality of the product. Furthermore, polymerization inhibitors are generally prepared using volatile solvents. In the preparation tank, the solvent slowly evaporates, causing the inhibitor to precipitate from the solution, clogging the pipes and preventing the inhibitor from flowing smoothly into the reactor when needed. Summary of the Invention

[0004] The purpose of this invention is to overcome the aforementioned problems existing in the current method of adding polymerization inhibitors and to provide a polymerization inhibitor addition device and a polymerization reaction system.

[0005] The objective of this utility model can be achieved through the following technical solutions:

[0006] One of the technical solutions of this utility model is to provide a polymerization inhibitor addition device, comprising:

[0007] A preparation vessel for preparing polymerization inhibitors, a first passage located at the bottom of the preparation vessel and connected to the reaction vessel, several branch passages connecting the first passage to a sampling bottle, and an alarm interlock assembly for monitoring whether there is polymerization inhibitor leakage in the sampling bottle.

[0008] The first passage is provided with a first cut-off assembly and a multi-port rotating assembly interlocked with the temperature inside the reactor. The multi-port rotating assembly includes a first interface, a second interface and a third interface, and is capable of connecting two of the interfaces and closing the remaining interfaces. The first interface is connected to the preparation tank, the second interface is connected to the reactor, and the third interface is connected to the sampling bottle.

[0009] The plurality of branch paths includes a first branch path that connects the first path and the sampling bottle via the multi-pass rotating assembly;

[0010] When the temperature inside the reactor rises to a set value, the first cutting-off component is temperature-interlocked to open the first passage, and at the same time the multi-pass rotating component is temperature-interlocked to connect the first interface and the second interface, thereby allowing the polymerization inhibitor in the preparation tank to flow to the reactor.

[0011] When the temperature inside the reactor is lower than the set value, the first cut-off component is temperature-interlocked to block the first passage, and at the same time the multi-pass rotating component is temperature-interlocked to connect the first interface with the third interface.

[0012] In some specific embodiments, the branch path further includes the first path leading to the first cutting component and a second branch path leading to the sampling bottle, wherein the second branch path is provided with a second cutting component.

[0013] In some specific embodiments, the second shut-off component is a manual shut-off valve.

[0014] In some specific embodiments, the polymerization inhibitor addition device further includes a temperature interlock assembly, which includes a temperature probe disposed in the reactor and a first signal acquisition controller electrically connected to the temperature probe. The first signal acquisition controller is also electrically connected to the first cutting component and the multi-pass rotating component.

[0015] In some specific embodiments, the temperature probe is selected from any one of a thermocouple probe, a resistance temperature detector (RTD) probe, or a thermistor probe.

[0016] In some specific embodiments, the alarm interlock assembly includes a gas probe disposed inside the sampling bottle, a second signal acquisition controller electrically connected to the gas probe, and an alarm electrically connected to the second signal acquisition controller.

[0017] In some specific embodiments, the gas probe is selected from any one of infrared absorption probes, thermal conductivity probes, and vibration probes.

[0018] In some specific embodiments, the first shut-off component is an automatic shut-off valve.

[0019] In some specific embodiments, the multi-way rotating assembly is an automatic three-way valve.

[0020] The second technical solution of this utility model is to provide a polymerization reaction system, including a reaction vessel and a polymerization inhibitor addition device as described in one of the above technical solutions, which is connected to the reaction vessel.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] This invention allows the multi-port rotating assembly to act as a second layer of protection when the first shut-off assembly malfunctions. It directs leaked polymerization inhibitor to a sampling bottle in the first branch passage, preventing the inhibitor from flowing directly into the reactor and minimizing the impact of leakage on the materials inside. Simultaneously, an alarm is triggered when the sampling bottle detects an inhibitor leak, facilitating timely repair or replacement by technicians. Furthermore, the second branch passage allows for sampling to detect whether the inhibitor has precipitated from the solution and blocked the pipes, ensuring that the inhibitor can flow smoothly into the reactor when needed, achieving a better polymerization inhibition effect. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of this utility model.

[0024] The diagram is labeled as follows:

[0025] 1 is the first passage, 2 is the first branch passage, 3 is the second branch passage, 4 is the reaction vessel, 5 is the preparation tank, 6 is the first cut-off assembly, 7 is the multi-pass rotating assembly, 8 is the temperature probe, 9 is the second cut-off assembly, 10 is the gas probe, and 11 is the sampling bottle. Detailed Implementation

[0026] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. This embodiment is based on the technical solution of the present invention and provides detailed implementation methods and specific operating procedures; however, the scope of protection of the present invention is not limited to the following embodiments.

[0027] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0028] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0029] In the following embodiments, unless otherwise specified, the functional components or structures are conventional components or structures used in the art to achieve the corresponding functions.

[0030] Example 1:

[0031] like Figure 1 The diagram shows a polymerization inhibitor addition device, comprising:

[0032] A preparation tank 5 for preparing polymerization inhibitors, a first passage 1 located at the bottom of the preparation tank 5 and connected to the reaction vessel 4, several branch passages connecting the first passage 1 to the sampling bottle 11, and an alarm interlock assembly for monitoring whether there is polymerization inhibitor leakage in the sampling bottle 11.

[0033] The first passage 1 is provided with a first cut-off component 6 and a multi-port rotating component 7 that are interlocked with the temperature inside the reactor 4. The multi-port rotating component 7 includes a first interface, a second interface and a third interface, and is able to connect two of the interfaces and close the remaining interfaces. The first interface is connected to the preparation tank 5, the second interface is connected to the reactor 4, and the third interface is connected to the sampling bottle 11.

[0034] The plurality of branch paths include a first branch path 2 that connects the first path 1 and the sampling bottle 11 via the multi-pass rotating assembly 7;

[0035] When the temperature inside the reactor 4 rises to the set value, the first cutting component 6 is temperature-locked and opens the first passage 1. At the same time, the multi-pass rotating component 7 is temperature-locked, so that the first interface and the second interface are connected, thereby allowing the polymerization inhibitor in the preparation tank 5 to flow to the reactor 4.

[0036] When the temperature inside the reactor 4 is lower than the set value, the first cut-off component 6 is temperature-interlocked to block the first passage 1, and at the same time the multi-pass rotating component 7 is temperature-interlocked to connect the first interface with the third interface.

[0037] When the first cut-off component 6 fails to close, the polymerization inhibitor in the preparation tank 5 leaks into the sampling bottle 11 through the multi-port rotating component 7. The alarm interlock component detects the gas released by the leakage of the polymerization inhibitor and issues an alarm.

[0038] This technical solution uses a multi-port rotating assembly 7 to connect the preparation tank 5 to the reaction vessel 4 and the sampling bottle 11. A first cut-off assembly 6 is installed on the first passage 1 connecting the preparation tank 5 and the reaction vessel 4. Both the multi-port rotating assembly 7 and the first cut-off assembly 6 are interlocked with the temperature inside the reaction vessel 4, effectively ensuring that when the temperature reaches the set temperature, the polymerization inhibitor can flow from the preparation tank 5 into the reaction vessel 4 to react and achieve the purpose of polymerization inhibition. When the reaction is normal, that is, when the temperature in the reaction vessel 4 has not reached the set temperature, the first cut-off assembly 6 cuts off the first passage 1 connecting the preparation tank 5 and the reaction vessel 4, and the outlet of the multi-port rotating assembly 7 is directed towards the sampling bottle 11. This effectively monitors whether the polymerization inhibitor from the preparation tank 5 may flow into the sampling bottle 11 if the first cut-off assembly 6 malfunctions, facilitating maintenance or replacement of the first cut-off assembly 6. Furthermore, it effectively prevents the polymerization inhibitor from leaking and dripping directly into the reaction vessel 4, thus avoiding contamination of the materials inside the reaction vessel 4.

[0039] The branch passage also includes a second branch passage 3 connecting the first passage 1 before the first cutting-off component 6 and the sampling bottle 11, with a second cutting-off component 9 provided on the second branch passage 3. By periodically opening the second cutting-off component 9, the polymerization inhibitor flows into the sampling bottle 11 through the second branch passage 3, so as to sample and detect whether the polymerization inhibitor precipitates from the solution and blocks the pipeline. Preferably, the second cutting-off component 9 is a manual cutting-off valve.

[0040] The polymerization inhibitor addition device further includes a temperature interlock assembly, which includes a temperature probe 8 disposed inside the reactor 4 and a first signal acquisition controller electrically connected to the temperature probe 8. The first signal acquisition controller is also electrically connected to the first cutting component 6 and the multi-pass rotation component 7. For example, the temperature probe 8 is a thermocouple probe, which converts temperature into a mV signal. After receiving the signal from the thermocouple probe, the first signal acquisition controller interlocks and controls the first cutting component 6 and the multi-pass rotation component 7.

[0041] The alarm interlock assembly includes a gas probe 10 disposed within the sampling bottle 11, a second signal acquisition controller electrically connected to the gas probe 10, and an alarm electrically connected to the second signal acquisition controller. For example, the gas probe 10 is a thermal conductivity type probe, which converts the detected thermal conductivity of the flammable gas emitted by the polymerization inhibitor into a mV signal. Upon receiving the signal from the thermal conductivity type probe, the second signal acquisition controller interlocks and controls the alarm.

[0042] Furthermore, the first shut-off component 6 may be an automatic shut-off valve, such as an electric butterfly shut-off valve.

[0043] The multi-way rotating assembly 7 can be an automatic three-way valve, such as an electric three-way regulating valve.

[0044] The usage process of this utility model is as follows:

[0045] When the reaction in reactor 4 is normal and the temperature has not risen to the threshold set by the first signal acquisition controller, the thermocouple probe converts the temperature into a mV signal. After receiving the thermocouple probe signal, the first signal acquisition controller interlocks and controls the automatic shut-off valve to cut off the first passage 1. The automatic three-way valve is temperature-interlocked, so that its first interface is connected to the third interface, preventing the polymerization inhibitor in the preparation tank 5 from flowing into the reactor 4.

[0046] If the automatic shut-off valve fails to close, the polymerization inhibitor in the preparation tank 5 flows to the automatic three-way valve through the first passage 1. Since the first and third ports of the automatic three-way valve are connected, the polymerization inhibitor flows to the sampling bottle 11 through the first branch passage 2. After the thermal conductivity probe in the sampling bottle 11 detects the gas, it converts the thermal conductivity into a mV signal. After the second signal acquisition controller receives the signal from the thermal conductivity probe, the interlock control alarm sounds an alarm.

[0047] When the temperature inside the reactor 4 rises to the threshold set by the first signal acquisition controller, the thermocouple probe converts the temperature into a mV signal. After receiving the thermocouple probe signal, the first signal acquisition controller interlocks and controls the automatic shut-off valve to open the first passage 1. The automatic three-way valve is temperature-interlocked, so that its first interface is connected to the second interface, allowing the polymerization inhibitor in the preparation tank 5 to flow to the reactor 4 to achieve the purpose of polymerization inhibition.

[0048] By intermittently opening the manual shut-off valve on the second branch passage 3, the polymerization inhibitor in the preparation tank 5 can flow directly to the sampling bottle 11, so as to sample and detect whether the polymerization inhibitor has precipitated from the solution and blocked the pipeline.

[0049] Example 2:

[0050] This embodiment provides a polymerization reaction system, including a reactor 4 and a polymerization inhibitor addition device connected to the reactor 4.

[0051] The above description of the embodiments is provided to enable those skilled in the art to understand and use the utility model. It will be apparent to those skilled in the art that various modifications can be easily made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present utility model is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present utility model without departing from its scope should be within the protection scope of the present utility model.

Claims

1. A polymerization inhibitor addition device, characterized in that, It includes a preparation tank (5) for preparing the polymerization inhibitor, a first passage (1) located at the bottom of the preparation tank (5) and connected to the reactor (4), several branch passages connecting the first passage (1) and the sampling bottle (11), and an alarm interlock assembly for monitoring whether there is a polymerization inhibitor leak in the sampling bottle (11). The first passage (1) is provided with a first cut-off assembly (6) and a multi-port rotating assembly (7) that are interlocked with the temperature inside the reactor (4). The multi-port rotating assembly (7) includes a first interface, a second interface and a third interface, and is able to connect two of the interfaces and close the remaining interfaces. The first interface is connected to the preparation tank (5), the second interface is connected to the reactor (4), and the third interface is connected to the sampling bottle (11). The plurality of branch paths include a first branch path (2) that connects the first path (1) and the sampling bottle (11) via the multi-pass rotating assembly (7); When the temperature inside the reactor (4) rises to the set value, the first cutting component (6) is temperature-locked and opens the first passage (1). At the same time, the multi-pass rotating component (7) is temperature-locked, so that the first interface and the second interface are connected, thereby allowing the polymerization inhibitor in the preparation tank (5) to flow to the reactor (4). When the temperature inside the reactor (4) is lower than the set value, the first cut-off component (6) is temperature-locked to block the first passage (1), and at the same time the multi-pass rotating component (7) is temperature-locked to connect the first interface with the third interface.

2. The polymerization inhibitor addition device according to claim 1, characterized in that, The branch path also includes a first path (1) leading to the first cutting component (6) and a second branch path (3) leading to the sampling bottle (11), and the second branch path (3) is provided with a second cutting component (9).

3. The polymerization inhibitor addition device according to claim 2, characterized in that, The second shut-off assembly (9) is a manual shut-off valve.

4. The polymerization inhibitor addition device according to claim 1, characterized in that, The polymerization inhibitor addition device also includes a temperature interlock assembly, which includes a temperature probe (8) disposed in the reactor (4) and a first signal acquisition controller electrically connected to the temperature probe (8). The first signal acquisition controller is also electrically connected to the first cut-off assembly (6) and the multi-pass rotation assembly (7).

5. The polymerization inhibitor addition device according to claim 4, characterized in that, The temperature probe (8) is selected from any one of thermocouple probes, resistance temperature detectors (RTD) probes, and thermistor probes.

6. The polymerization inhibitor addition device according to claim 1, characterized in that, The alarm interlock assembly includes a gas probe (10) disposed in the sampling bottle (11), a second signal acquisition controller electrically connected to the gas probe (10), and an alarm electrically connected to the second signal acquisition controller.

7. The polymerization inhibitor addition device according to claim 6, characterized in that, The gas probe (10) is selected from any one of infrared absorption probe, thermal conductivity probe, and vibration probe.

8. The polymerization inhibitor addition device according to claim 1, characterized in that, The first shut-off assembly (6) is an automatic shut-off valve.

9. The polymerization inhibitor addition device according to claim 1, characterized in that, The multi-way rotating assembly (7) is an automatic three-way valve.

10. A polymerization reaction system, characterized in that, It includes a reactor (4) and an inhibitor addition device as described in any one of claims 1 to 9, which is connected to the reactor (4).

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