System for removing and discharging trace water in bulk styrene polymerization process

Abstract

The utility model relates to the technical field of bulk polymerization of styrene, in particular to a system for removing and discharging trace water in a bulk polymerization process of styrene, which comprises a prepolymerization reaction kettle, a condensation assembly, a separation assembly and a drainage assembly, the condensation assembly is used for condensing styrene steam containing certain moisture generated by a prepolymerization reaction, and the separation assembly is used for separating water obtained after condensation from a styrene polymer, feeding the separated water into the drainage assembly and feeding the styrene polymer back to the prepolymerization reaction kettle. And the drainage assembly is used for draining water obtained from the separation assembly out of the system. According to the utility model, trace water can be effectively removed and discharged in the styrene polymerization process, and after the water is removed, the polymerization reaction temperature can be more stably controlled and the temperature fluctuation is reduced, so that the stability of the styrene polymerization reaction and the stability of the product quality are ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of bulk styrene polymerization, in particular to a system for removing and discharging trace water in the bulk styrene polymerization process. Background Art

[0002] Bulk styrene polymerization is a common method for producing polystyrene. Its characteristic is that the entire polymerization reaction is completed in a single reactor, usually without the addition of an initiator, and polymerization proceeds under the action of heat. This method uses styrene monomer as the raw material and produces polystyrene particles through polymerization. The polymerization process requires controlling process parameters such as temperature, pressure, and feed ratio, as well as selecting appropriate catalysts and additives.

[0003] During the bulk polymerization of styrene, moisture introduced into the polymerization reactor from the raw materials can cause temperature fluctuations during the polymerization, leading to instability in the polymerization reaction and a decrease in the physical properties and stability of the product. This can cause the produced polystyrene to fail quality standards, necessitating rework or scrapping. Furthermore, stearate is a common additive used in the styrene polymerization process to improve product performance. However, stearate is susceptible to decomposition due to the presence of water, impacting product quality and production stability. Utility Model Content

[0004] In view of the above problems, the purpose of the present invention is to overcome the shortcomings of the prior art and design a system for removing and discharging trace water in the bulk styrene polymerization process.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a system for removing and discharging trace water in a bulk styrene polymerization process, comprising a prepolymerization reactor, a condensation component, a separation component and a drainage component, wherein the prepolymerization reactor is used to carry out a prepolymerization reaction of styrene, the condensation component is used to condense styrene vapor containing a certain amount of water generated by the prepolymerization reaction, the separation component is used to separate the water obtained after condensation from the styrene polymer, and send the separated water to the drainage component, and send the styrene polymer back to the prepolymerization reactor, and the drainage component is used to discharge the water obtained from the separation component out of the system.

[0006] As a preferred embodiment of the present invention, the prepolymerization reactor and the condensation component, the condensation component and the separation component, the separation component and the drainage component, and the separation component and the prepolymerization reactor are sealed and connected through pipes. The prepolymerization reactor sends the styrene vapor containing a certain amount of water generated by the prepolymerization reaction into the condensation component through the pipe, the condensation component sends the liquid after the styrene vapor is condensed into the separation component through the pipe, the separation component sends water into the drainage component through the pipe, and sends the styrene polymer back to the prepolymerization reactor.

[0007] As a preferred embodiment of the present invention, the condensation component includes a kettle top reflux condenser, which is arranged above the prepolymerization reactor, and the kettle top reflux condenser is located 1.5 to 2 meters above the top of the prepolymerization reactor.

[0008] As a preferred embodiment of the present invention, the separation component includes a condensate water separation tank, which is arranged below the top of the prepolymerization reactor, and the condensate water separation tank is located 0.5 to 1 meter below the top of the prepolymerization reactor.

[0009] As a preferred embodiment of the present invention, the drainage assembly includes a water collection tank, which is arranged below the condensate water separation tank, and the distance between the water collection tank and the condensate water separation tank is about 0.6 meters.

[0010] As a preferred embodiment of the present invention, the drainage assembly further includes a pressurizing component, which is disposed on the top of the water collection tank and is used to pressurize the water collection tank when draining water.

[0011] As a preferred embodiment of the present invention, a sight glass is provided on the water collecting tank, and the sight glass is used to observe the liquid level of the water layer in the water collecting tank.

[0012] As a preferred embodiment of the present invention, the drainage assembly further includes a waste liquid tank, which is used to collect liquid in the water collection tank.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] The utility model, through the coordination of the prepolymerization reactor, condensation assembly, separation assembly, and drainage assembly, can effectively remove and drain trace water during the styrene polymerization process. After the water is removed, the polymerization reaction temperature can be more stably controlled, temperature fluctuations can be reduced, and thus the stability of the styrene polymerization reaction and the stability of the product can be ensured. At the same time, the dehydration can also prevent the decomposition of stearate due to water, thereby maintaining product quality and production stability.

[0015] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0017] Figure 1This is a schematic diagram of the structure of the system for removing and discharging trace water during the bulk styrene polymerization process. Figure 1 .

[0018] Figure 2 This is a schematic diagram of the structure of the system for removing and discharging trace water during the bulk styrene polymerization process. Figure 2 .

[0019] Figure 3 This is a schematic diagram of the structure of the system for removing and discharging trace water during the bulk styrene polymerization process. Figure 3 .

[0020] Reference numerals include:

[0021] Prepolymerization reactor 1, condensation component 2, reactor top reflux condenser 2a, separation component 3, condensate water separation tank 3a, drainage component 4, water collection tank 4a, sight glass 4b, pressurizing component 4c, low-pressure nitrogen pipe 4c1, nitrogen valve 4c2, waste liquid tank 4d, pipeline 5, precipitated liquid discharge pipe 5a, discharge valve 5b, drain valve 5c. DETAILED DESCRIPTION

[0022] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0023] like Figures 1 to 3 As shown, the utility model is a system for removing and discharging trace water in a bulk styrene polymerization process, comprising a prepolymerization reactor 1, a condensation component 2, a separation component 3 and a drainage component 4, wherein the prepolymerization reactor 1 is used to carry out a prepolymerization reaction of styrene, the condensation component 2 is used to condense the styrene vapor containing a certain amount of water produced by the prepolymerization reaction, the separation component 3 is used to separate the water obtained after condensation from the styrene polymer, and to send the separated water to the drainage component 4, and to return the styrene polymer to the prepolymerization reactor 1, and the drainage component 4 is used to discharge the water obtained from the separation component 3 into the system. The utility model can effectively remove and discharge trace water in the styrene polymerization process through the coordination between the prepolymerization reactor 1, the condensation component 2, the separation component 3 and the drainage component 4. After removing water, the polymerization reaction temperature can be more stably controlled, temperature fluctuations can be reduced, and thus the styrene polymerization reaction and product quality can be stabilized. At the same time, by removing water, stearate can also be prevented from decomposing due to water, thereby maintaining product quality and production stability.

[0024] Specifically, refer to Figure 1As shown, the prepolymerization reactor 1 and the condensation component 2, the condensation component 2 and the separation component 3, the separation component 3 and the drainage component 4, and the separation component 3 and the prepolymerization reactor 1 are sealed together through a pipe 5. The prepolymerization reactor 1 sends the styrene vapor containing a certain amount of water generated by the prepolymerization reaction into the condensation component 2 through the pipe 5, the condensation component 2 sends the liquid after the styrene vapor is condensed into the separation component 3 through the pipe 5, the separation component 3 sends water into the drainage component 4 through the pipe 5, and sends the styrene polymer back to the prepolymerization reactor 1.

[0025] Specifically, refer to Figure 2 As shown, the condensing assembly 2 includes a top reflux condenser 2a, which is arranged above the prepolymerization reactor 1, and the top reflux condenser 2a is located at a position 1.5 to 2 meters above the top of the prepolymerization reactor 1. The top reflux condenser 2a is used to condense the styrene vapor containing a certain amount of moisture produced by the prepolymerization reaction. By arranging the top reflux condenser 2a at a position a certain distance above the prepolymerization reactor 1, the top reflux condenser 2a can be made to condense the styrene vapor better.

[0026] Specifically, refer to Figure 2 As shown, the separation assembly 3 includes a condensate separation tank 3a, which is disposed below the top of the prepolymerization reactor 1, and is located 0.5 to 1 meter below the top of the prepolymerization reactor 1. By positioning the condensate separation tank 3a a certain distance below the top of the prepolymerization reactor 1, the styrene polymer obtained after condensation can be better separated from the water. This design helps improve the separation effect and enables the drainage assembly 4 to more conveniently receive the separated water.

[0027] Specifically, refer to Figure 2 As shown, the drainage assembly 4 includes a water collection tank 4a, which is positioned below the condensate separation tank 3a, with a spacing of approximately 0.6 meters between the two tanks. By positioning the water collection tank 4a a certain distance below the condensate separation tank 3a, the water collected by the separation assembly 3 can be better collected. This design helps improve water collection efficiency and facilitates water discharge operations.

[0028] Specifically, refer to Figure 2As shown, the drainage assembly 4 also includes a pressurizing component 4c, located on top of the water collection tank 4a. This component is used to pressurize the water collection tank 4a during drainage. The addition of this pressurizing component ensures that the water in the water collection tank 4a can be drained smoothly. When the water in the water collection tank 4a reaches a certain level, the pressurizing component 4c provides sufficient pressure to drain the water from the water collection tank 4a and out of the system.

[0029] Specifically, refer to Figure 2 As shown, the water collection tank 4a is equipped with a sight glass 4b for observing the liquid level of the water layer within the water collection tank 4a. The sight glass 4b allows the operator to conveniently observe the liquid level within the water collection tank 4a, thereby promptly understanding the operating status of the water collection tank 4a. When the water level reaches a certain height, the operator can use the pressurizing component 4c to drain the water, thereby preventing excessive water accumulation within the water collection tank 4a.

[0030] Specifically, refer to Figure 2 As shown, the drainage assembly 4 also includes a waste liquid tank 4d, which is used to collect liquid from the water collection tank 4a. The provision of the waste liquid tank 4d allows for better management and processing of the liquid collected in the water collection tank 4a. This liquid may contain styrene polymers and other impurities and therefore requires proper disposal or recycling. The waste liquid tank 4d provides sufficient capacity to accommodate the liquid collected in the water collection tank 4a and ensures that it is properly processed or recycled.

[0031] The more specific principles of the present invention are as follows:

[0032] refer to Figure 1 、 Figure 2 and Figure 3 As shown, the top reflux condenser 2a is placed above the prepolymerization reactor 1, and the steam in the prepolymerization reactor 1 enters the top reflux condenser 2a through the pipeline 5 to condense into liquid.

[0033] A condensate water separation tank 3a is set under the top of the prepolymerization reactor 1. A precipitate discharge pipe 5a is set at the bottom of the condensate water separation tank 3a and is connected to the water collecting tank 4a below. A discharge valve 5b is added between the two tanks. A drain pipe is set at the bottom of the lower water collecting tank 4a for drainage, and a low-pressure nitrogen pipe 4c1 is installed on the top for pressurized drainage during drainage.

[0034] Typically, each time the kettle top reflux condenser 2a is drained, the condensate separation tank 3a and the water collection tank 4a are filled with liquid. As the reaction system operates, water continuously forms droplets in the condensate separation tank 3a. Due to the principle that styrene has a lower specific gravity than water, water continuously settles at the bottom of the condensate separation tank 3a. The deposited water then enters the water collection tank 4a through the sedimentation liquid discharge pipe 5a. At this time, the liquid level of the water layer in the water collection tank 4a can be clearly seen through the sight glass 4b on the water collection tank 4a. When the water layer in the water collection tank 4a reaches 2 / 3 of the tank level, the discharge valve 5b between the upper part of the water collection tank 4a and the condensate separation tank 3a is closed, the drain valve 5c at the lower part of the water collection tank 4a is opened, and the nitrogen valve 4c2 is opened one or two times to discharge the wastewater into the waste liquid tank 4d.

[0035] When the liquid in the water collection tank 4a is drained, close the nitrogen valve 4c2, close the bottom drain valve 5c, and slowly open the discharge valve 5b between the water separation tank and the water collection tank to complete the drainage operation, thereby completing the operation of removing water from the prepolymerization reactor 1.

[0036] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. A system for removing and discharging trace water in a bulk styrene polymerization process, characterized in that: The invention comprises a prepolymerization reactor (1), a condensation component (2), a separation component (3) and a drainage component (4), wherein the prepolymerization reactor (1) is used for carrying out a prepolymerization reaction of styrene, the condensation component (2) is used for condensing styrene steam containing a certain amount of water generated by the prepolymerization reaction, the separation component (3) is used for separating the water obtained after condensation from the styrene polymer, and sending the separated water to the drainage component (4), and sending the styrene polymer back to the prepolymerization reactor (1), and the drainage component (4) is used for discharging the water obtained from the separation component (3) out of the system.

2. The system for removing and discharging trace water in a bulk styrene polymerization process according to claim 1, characterized in that: The prepolymerization reactor (1) and the condensation component (2), the condensation component (2) and the separation component (3), the separation component (3) and the drainage component (4), and the separation component (3) and the prepolymerization reactor (1) are sealed and connected via a pipeline (5); the prepolymerization reactor (1) sends styrene vapor containing a certain amount of water generated by the prepolymerization reaction into the condensation component (2) via the pipeline (5); the condensation component (2) sends liquid after condensation of the styrene vapor into the separation component (3) via the pipeline (5); the separation component (3) sends water into the drainage component (4) via the pipeline (5), and sends the styrene polymer back to the prepolymerization reactor (1).

3. The system for removing and discharging trace water in a bulk styrene polymerization process according to claim 1, characterized in that: The condensation component (2) includes a kettle top reflux condenser (2a), which is arranged above the prepolymerization reactor (1) and is located 1.5 to 2 meters above the top of the prepolymerization reactor (1).

4. The system for removing and discharging trace water in a bulk styrene polymerization process according to claim 1, characterized in that: The separation component (3) includes a condensate water separation tank (3a), which is arranged below the top of the prepolymerization reactor (1), and the condensate water separation tank (3a) is located 0.5 to 1 meter below the top of the prepolymerization reactor (1).

5. The system for removing and discharging trace water in a bulk styrene polymerization process according to claim 1, characterized in that: The drainage assembly (4) comprises a water collecting tank (4a), which is arranged below the condensate water separation tank (3a), and the distance between the water collecting tank (4a) and the condensate water separation tank (3a) is approximately 0.6 meters.

6. The system for removing and discharging trace water in a bulk styrene polymerization process according to claim 5, characterized in that: The drainage assembly (4) further comprises a pressurizing component (4c), which is arranged on the top of the water collection tank (4a) and is used to pressurize the water collection tank (4a) when draining water.

7. The system for removing and discharging trace water in a bulk styrene polymerization process according to claim 5, characterized in that: The water collecting tank (4a) is provided with a sight glass (4b), and the sight glass (4b) is used to observe the liquid level of the water layer in the water collecting tank (4a).

8. The system for removing and discharging trace water in a bulk styrene polymerization process according to claim 5, characterized in that: The drainage assembly (4) further comprises a waste liquid tank (4d), and the waste liquid tank (4d) is used to collect liquid in the water collection tank (4a).

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