Device for treating devolatilization condensate of polystyrene device

Abstract

The invention discloses a devolatilization condensate treatment device for a polystyrene device, and belongs to the technical field of chemical production, the devolatilization condensate treatment device comprises a devolatilization device, a feeding pipeline is arranged on one side of the devolatilization device, an air outlet pipe is arranged on the devolatilization device, an upper flange and a lower flange are arranged on the air outlet pipe, and a U-shaped liquid guide groove is formed in the position, between the upper flange and the lower flange, in the air outlet pipe. A liquid discharge pipe is arranged at the bottom of the U-shaped liquid guide groove, a first waste liquid collecting tank is arranged on one side of the devolatilization device, and the liquid discharge pipe is connected with the first waste liquid collecting tank through a pipeline. Gas discharged from the devolatilization device is clean and sanitary and does not pollute the environment, and it is also avoided that the purity of raw materials in the devolatilization device is affected by recovery of condensate; and the condensate in the U-shaped liquid guide groove can form liquid seal, so that the gas is prevented from entering the first waste liquid collecting tank to influence the air pressure in the first waste liquid collecting tank.

Description

Technical Field

[0001] The present invention relates to the technical field of chemical production, and particularly to a device for treating devolatilization condensate in a polystyrene plant. Background Art

[0002] In the modern polystyrene production process, the devolatilizer plays a crucial role and is one of the key devices in the entire production system. Its core function is to accurately and efficiently remove the residual volatile substances in polystyrene. If these volatile substances cannot be effectively removed, it will greatly affect the performance indicators of polystyrene products. During actual production operation, the gas in the devolatilizer is quickly evacuated by the strong suction generated by the vacuum unit. However, since the gas transmission pipeline often needs to span a long distance, during this transmission process, the gas will inevitably exchange heat with the external environment, resulting in some gas condensing when it gets cold, thus generating a part of condensed gas. Currently, in most traditional polystyrene production processes, this part of the condensed gas usually directly returns to the inside of the devolatilizer. This reflux phenomenon has caused a series of serious problems, and the most prominent one is the serious pollution of product quality. Specifically, the purity of the product has decreased significantly. The originally pure polystyrene has been mixed with impurities carried by the condensed gas, resulting in a substantial increase in the impurity content. The decline in product quality directly leads to a significant reduction in its performance, losing its advantage in the market competition, and being difficult to meet the strict requirements of high-end customers for product performance, thereby affecting the market competitiveness of the product. At the same time, the reflux of the condensed gas also means that some raw materials that have not fully reacted or can be recycled are wasted without reason, which undoubtedly increases the production cost. And due to the product quality problems, additional treatment processes are required, which also reduces the overall production efficiency. Summary of the Invention

[0003] In order to solve the technical problems mentioned in the above background art, the present invention provides a device for treating devolatilization condensate in a polystyrene plant, and the technical solution adopted is as follows:

[0004] It includes a devolatilizer. A feed pipeline is arranged on one side of the devolatilizer. An air outlet pipe is arranged on the devolatilizer. Upper and lower flanges are arranged on the air outlet pipe. A U-shaped liquid guide groove is arranged between the upper flange and the lower flange inside the air outlet pipe. A drain pipe is arranged at the bottom of the U-shaped liquid guide groove. A first waste liquid collection tank is arranged on one side of the devolatilizer. The drain pipe is connected to the first waste liquid collection tank through a pipeline.

[0005] Furthermore, the air outlet pipe is provided with a pipeline and the pipeline is connected to the pipeline on the first waste liquid collection tank. The pipeline on the air outlet pipe is in a downward slope shape.

[0006] Further, a second waste liquid collection tank is provided on one side of the first waste liquid collection tank, a devolatilization condenser is provided on one side of the second waste liquid collection tank, a vacuum unit is provided on one side of the devolatilization condenser, the second waste liquid collection tank is connected to the devolatilization condenser through a pipeline, one side of the devolatilization condenser is connected to the pipeline on the gas outlet pipe through a pipeline, and the other side is connected to the vacuum unit through a pipeline.

[0007] Further, pipelines are provided at the bottoms of both the first waste liquid collection tank and the second waste liquid collection tank, and the two pipelines are connected.

[0008] Further, a pipeline is provided at the bottom of the devolatilizer.

[0009] Further, a pipeline is provided on one side of the vacuum unit.

[0010] The present invention has the following advantages: The gas generated in the devolatilizer is discharged through the gas outlet pipe. During the external discharge process, the vapor phase in the gas forms condensate and adheres to the inner wall of the gas outlet pipe. Under the action of gravity, it falls along the inner wall of the gas outlet pipe in the form of a trickle and lands in the U-shaped liquid guiding groove. The condensate in the U-shaped liquid guiding groove is discharged into the first waste liquid collection tank through the drain pipe. This not only ensures that the gas discharged from the devolatilizer is clean and hygienic and does not pollute the environment, but also avoids the influence of recycling this part of the condensate on the purity of the raw materials in the devolatilizer. Moreover, the condensate in the U-shaped liquid guiding groove will also form a liquid seal to prevent gas from entering the first waste liquid collection tank and affecting the air pressure in the first waste liquid collection tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 is a schematic flow chart of the present invention;

[0012] Figure 2 is the Figure 1 partial enlarged view of the a position in the present invention;

[0013] Figure 3 is a three-dimensional view of the U-shaped liquid guiding groove of the present invention.

[0014] DRAWINGS: 1. Devolatilizer, 2. Feed pipeline, 3. Gas outlet pipe, 4. Upper flange, 5. Lower flange, 6. U-shaped liquid guiding groove, 7. Drain pipe, 8. First waste liquid collection tank, 9. Second waste liquid collection tank, 10. Devolatilization condenser, 11. Vacuum unit. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0015] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0016] The present invention provides a device for treating devolatilization condensate in a polystyrene device, including a devolatilizer 1. A feed pipeline 2 is arranged on one side of the devolatilizer 1. The polymer enters the devolatilizer 1 through the feed pipeline 2 for reaction. An air outlet pipe 3 is arranged on the devolatilizer 1, and the gas in the devolatilizer 1 is discharged through the air outlet pipe 3. Upper flange 4 and lower flange 5 are arranged on the air outlet pipe 3, and the air outlet pipe 3 is fixed on the devolatilizer 1 through the upper flange 4 and the lower flange 5. A U-shaped liquid guide groove 6 is arranged at the position between the upper flange 4 and the lower flange 5 in the air outlet pipe 3. The U-shaped liquid guide groove 6 is fixed on the inner wall of the air outlet pipe 3. The inner side of the U-shaped liquid guide groove is in a through-hole shape to facilitate the gas in the devolatilizer 1 to pass through. A drain pipe 7 is arranged at the bottom of the U-shaped liquid guide groove 6. A first waste liquid collection tank 8 is arranged on one side of the devolatilizer 1. The condensate in the U-shaped liquid guide groove 6 is discharged through the drain pipe 7, and a part of the condensate is always retained in the liquid guide groove 6. The drain pipe 7 is connected to the first waste liquid collection tank 8 through a pipeline, and the condensate in the U-shaped liquid guide groove 6 is discharged into the first waste liquid collection tank 8 through the drain pipe 7 and collected therein.

[0017] The air outlet pipe 3 is provided with a pipeline which is connected to the pipeline on the first waste liquid collection tank 8. The pipeline on the air outlet pipe 3 is in a downward slope shape. A part of the vapor phase still forms condensate during the discharge process of the gas discharged from the air outlet pipe 3, and is discharged into the first waste liquid collection tank 8 through the downward-sloping pipeline for further collection. A second waste liquid collection tank 9 is arranged on one side of the first waste liquid collection tank 8. A devolatilization condenser 10 is arranged on one side of the second waste liquid collection tank 9. A vacuum unit 11 is arranged on one side of the devolatilization condenser 10. The second waste liquid collection tank 9 is connected to the devolatilization condenser 10 through a pipeline. One side of the devolatilization condenser 10 is connected to the pipeline on the air outlet pipe 3 through a pipeline, and the other side is connected to the vacuum unit 11 through a pipeline. The gas in the devolatilizer 1 is pumped out through the vacuum of the vacuum unit 11. When the gas passes through the devolatilization condenser 10, it is further cooled, so that the remaining vapor phase in the gas forms condensate again and is discharged into the second waste liquid collection tank 9 through the pipeline.

[0018] Both the bottom of the first waste liquid collection tank 8 and the second waste liquid collection tank 9 are provided with pipelines and the two pipelines are connected. Through this pipeline, the condensate in the first waste liquid collection tank 8 and the second waste liquid collection tank 9 is discharged. A pipeline is arranged at the bottom of the devolatilizer 1, and the polymer raw material of the gas discharged from the devolatilizer 1 is discharged through the pipeline at its bottom. A pipeline is arranged on one side of the vacuum unit 11, and the gas removing the vapor phase in the gas is discharged through this pipeline.

[0019] Working principle of the present invention: Under the action of the vacuum unit 11, the gas in the devolatilizer 1 is discharged through the outlet pipe 3. During the upward movement of the gas, the vapor phase therein forms condensate and falls in a trickle form along the inside of the outlet pipe 3, landing in the U-shaped liquid guide trough 6. A part of the condensate is retained in the U-shaped liquid guide trough 6 to form a liquid seal, and the remaining condensate is discharged through the drain pipe 7 into the first waste liquid collection tank 8 through a pipeline for collection. The gas discharged from the outlet pipe 3 is condensed by the devolatilization condenser 10 and then discharged by the vacuum unit 11.

[0020] The operation of the present invention is simple and convenient to use, and is suitable for comprehensive promotion and application. Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A devolatilization condensate treatment device for a polystyrene plant, comprising a devolatilizer (1), and a feed pipeline (2) is arranged on one side of the devolatilizer (1), and is characterized in that, An exhaust gas pipe (3) is provided on the devolatilizer (1). An upper flange (4) and a lower flange (5) are provided on the exhaust gas pipe (3). A U-shaped liquid guide groove (6) is provided inside the exhaust gas pipe (3) between the upper flange (4) and the lower flange (5). A drain pipe (7) is provided at the bottom of the U-shaped liquid guide groove (6). A first waste liquid collection tank (8) is provided on one side of the devolatilizer (1). The drain pipe (7) is connected to the first waste liquid collection tank (8) through a pipeline.

2. The devolatilization condensate treatment device for a polystyrene plant according to claim 1, characterized in that, The exhaust gas pipe (3) is provided with a pipeline which is connected to the pipeline on the first waste liquid collection tank (8). The pipeline on the exhaust gas pipe (3) is in a downward-sloping shape.

3. The devolatilization condensate treatment device for a polystyrene device according to claim 2, wherein A second waste liquid collection tank (9) is provided on one side of the first waste liquid collection tank (8). A devolatilization condenser (10) is provided on one side of the second waste liquid collection tank (9). A vacuum unit (11) is provided on one side of the devolatilization condenser (10). The second waste liquid collection tank (9) is connected to the devolatilization condenser (10) through a pipeline. One side of the devolatilization condenser (10) is connected to the pipeline on the exhaust gas pipe (3) through a pipeline, and the other side is connected to the vacuum unit (11) through a pipeline.

4. The devolatilization condensate treatment device of a polystyrene device according to claim 3, characterized in that Both the bottom of the first waste liquid collection tank (8) and the bottom of the second waste liquid collection tank (9) are provided with pipelines and the two pipelines are connected.

5. The devolatilization condensate treatment device of a polystyrene device according to claim 4, characterized in that, A pipeline is provided at the bottom of the devolatilizer (1).

6. The devolatilization condensate treatment device of a polystyrene device according to claim 5, wherein, A pipeline is provided on one side of the vacuum unit (11).

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