Anti-pollution system for adsorption tower top end socket

Abstract

The utility model relates to the technical field of chemical production, in particular to an anti-pollution system for an end socket of an adsorption tower. A partition plate is arranged in the adsorption tower top end socket and divides the adsorption tower top end socket into a low-purity area and a high-purity area, the high-purity area is connected with a desorption agent introduction pipeline, the low-purity area is connected with a discharge pipeline, the high-purity area is provided with a first balance pipe communicated to the interior of the adsorption tower, and the adsorption tower top end socket is provided with a second balance pipe communicated to the interior of the adsorption tower. And the low-purity area is provided with a second balance pipe communicated to the interior of the adsorption tower. According to the utility model, the top seal head is divided into the low-purity area and the high-purity area, so that the whole area of the top seal head of the adsorption tower is prevented from being frequently polluted, the high-purity area is ensured to maintain higher desorption agent purity, and the influence on the PX purity is reduced.

Description

Technical Field

[0001] This utility model relates to the field of chemical production technology, specifically to an anti-pollution system for the top end cap of an adsorption tower. Background Technology

[0002] Aromatic hydrocarbons generally refer to hydrocarbons containing a benzene ring or aromatic ring structure in their molecules. They are a type of closed-chain hydrocarbon with the basic benzene ring structure. Aromatic hydrocarbons include a benzene derivative called "p-xylene," which is one of the isomers of xylene. Other isomers include o-xylene and m-xylene.

[0003] The production process of aromatics typically involves steps such as fractionation, isomerization, adsorption, extraction, and disproportionation. In an aromatics plant, the adsorption unit uses a simulated moving bed, dividing the fixed adsorption bed into multiple sections, each filled with adsorbent. Liquid flow between sections is restricted. Each section has inlet and outlet pipes, controlled by a central control unit. Four zones circulate, each with varying purity. A head is installed at the top of the adsorption tower to act as a buffer, preventing pressure fluctuations during valve switching from the four zones to the top, which could damage the top grid trays. The head is filled with pure desorbent. When the head pressure is lower than the bed pressure, the adsorbent flows into the head through a U-shaped balance pipe; when the head pressure is higher than the bed pressure, the adsorbent flows into the adsorption tower through the balance pipe.

[0004] The four zones within the adsorption tower circulate and switch materials, causing frequent material entry and exit through the U-shaped balance pipe at the top of the tower. Consequently, materials of varying purities from all four zones can enter the top of the adsorption tower. Three of the zones contain impure materials, contaminating the top of the tower and affecting the purity of the desorbent within. Due to the circulating process, the purity of the remaining zone is also affected, further impacting PX purity. For a long time, only a little over 90% desorbent purity has been maintained at the top of the tower, thus affecting PX purity and indirectly impacting PX production. Utility Model Content

[0005] In view of the deficiencies of the prior art, this utility model provides an anti-contamination system for the top end cap of an adsorption tower, which divides the top end cap into a low-purity area and a high-purity area to avoid frequent contamination of the entire area of ​​the top end cap of the adsorption tower, so as to ensure that the high-purity area maintains a high desorbent purity and reduce the impact on the purity of PX.

[0006] To achieve the above objectives, the present invention provides a pollution prevention system for the top end cap of an adsorption tower, comprising an adsorption tower and an adsorption tower top end cap at the top of the adsorption tower. A partition plate is provided inside the top end cap, dividing the top end cap into a low-purity region and a high-purity region. The high-purity region is connected to a desorbent inlet pipeline, and the low-purity region is connected to an outlet pipeline. The high-purity region is provided with a first balance pipe connecting to the interior of the adsorption tower, and the low-purity region is provided with a second balance pipe connecting to the interior of the adsorption tower.

[0007] Furthermore, both the first balancing tube and the second balancing tube are U-shaped tubes.

[0008] Furthermore, the upper part of the partition plate is provided with a through hole.

[0009] Furthermore, the discharge pipeline is connected to the distillation system.

[0010] Furthermore, the first balance pipe is equipped with a first one-way valve to control the desorbent from entering the adsorption tower from the high-purity area.

[0011] Furthermore, the second balance pipe is equipped with a second one-way valve to control the material from the adsorption tower into the low-purity zone.

[0012] Furthermore, a first regulating valve assembly is provided on the desorbent inlet pipeline.

[0013] Furthermore, the first regulating valve group includes a first manual valve, a first flow regulating valve, and a second manual valve arranged sequentially.

[0014] Furthermore, a second regulating valve assembly is installed on the external discharge pipeline.

[0015] Furthermore, the second regulating valve group includes a third manual valve, a second flow regulating valve, and a fourth manual valve arranged in sequence.

[0016] The beneficial effects of this invention are: dividing the top end cap into a low-purity region and a high-purity region, avoiding frequent contamination of the entire area of ​​the top end cap of the adsorption tower, ensuring that the high-purity region maintains a high desorbent purity, and reducing the impact on PX purity. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of an anti-pollution system for the top end cap of an adsorption tower in one embodiment of the present invention;

[0018] In the picture:

[0019] 100. Adsorption tower; 110. Top end cap of adsorption tower; 111. Divider plate; 1111. Through hole; 112. Low purity zone; 1121. Second balance pipe; 1122. Second check valve; 113. High purity zone; 1131. First balance pipe; 1132. First check valve.

[0020] 200. Desorbent inlet pipeline; 210. First regulating valve assembly; 211. First manual valve; 212. First flow regulating valve; 213. Second manual valve.

[0021] 300. External discharge pipeline; 310. Second regulating valve group; 311. Third hand valve; 312. Second flow regulating valve; 313. Fourth hand valve. Detailed Implementation

[0022] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0023] See Figure 1 The diagram shows a schematic of an anti-pollution system for the top end cap of an adsorption tower according to an embodiment of the present invention. The system includes an adsorption tower 100 and an adsorption tower top end cap 110 at the top of the adsorption tower 100. A partition plate 111 is provided inside the top end cap 110, dividing it into a low-purity region 112 and a high-purity region 113. The high-purity region 113 is connected to a desorbent inlet pipeline 200, and the low-purity region 112 is connected to an outlet pipeline 300. A first balance pipe 1131, connecting to the interior of the adsorption tower 100, is provided in the high-purity region 113, and a second balance pipe 1121, connecting to the interior of the adsorption tower 100, is provided in the low-purity region 112.

[0024] The aforementioned anti-contamination system for the top end cap of the adsorption tower divides the top end cap into a low-purity zone and a high-purity zone. Desorbent with a purity of 99% enters the top end cap through the desorbent inlet pipe 200, then flows from the high-purity zone 113 into the adsorption tower 100 via the first balance pipe 1131 to participate in the circulation. After its purity decreases, it flows through the second balance pipe 1121 from inside the adsorption tower 100 into the low-purity zone 112 and is discharged through the outlet pipe 300. This system prevents frequent contamination of the entire top end cap of the adsorption tower, ensuring that the high-purity zone maintains a high desorbent purity and reducing the impact on PX purity. Furthermore, producers can sample and analyze the purity changes in the low-purity zone 112 and the high-purity zone 113, indirectly observing changes in PX purity in the adsorption tower, thus improving production output.

[0025] Preferably, in one embodiment, both the first balancing tube 1131 and the second balancing tube 1121 are U-shaped tubes.

[0026] In one embodiment, a through hole 1111 is provided on the upper part of the partition plate 111. In this embodiment, the through hole 1111 on the partition plate 111 can effectively balance the pressure on both sides of the through hole 1111 to avoid excessive pressure difference.

[0027] In one embodiment, the outflow line 300 is connected to the distillation system.

[0028] In one embodiment, the first balance pipe 1131 is provided with a first one-way valve 1132 to control the desorbent from the high purity zone 113 into the adsorption tower 100.

[0029] In one embodiment, the second balance pipe 1121 is provided with a second one-way valve 1122 to control the material from the adsorption tower 100 into the low purity region 112.

[0030] In the above embodiments, the first one-way valve 1132 and the second one-way valve 1122 can guide the desorbent to circulate in one direction, preventing the contaminated desorbent from re-entering the high-purity area 113.

[0031] In one embodiment, a first regulating valve assembly 210 is provided on the desorbent inlet line 200.

[0032] In a specific configuration, the first regulating valve group 210 further includes a first manual valve 211, a first flow regulating valve 212, and a second manual valve 213 arranged sequentially.

[0033] In one embodiment, a second regulating valve group 310 is provided on the external discharge pipeline 300.

[0034] In a specific configuration, the second regulating valve group 310 further includes a third hand valve 311, a second flow regulating valve 312, and a fourth hand valve 313 arranged sequentially.

[0035] In the above embodiments, the flow rate of the desorbent entering the pipeline 200 can be adjusted by the first flow regulating valve 212, and the flow rate of the outlet pipeline 300 can be adjusted by the second flow regulating valve 312, so as to ensure that the top end cap 110 of the adsorption tower operates at a certain flow rate, so that the entire cycle is in a relatively stable state.

[0036] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0037] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0038] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0039] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature. It should be noted that when an element is referred to as "fixed to" or "set on" another element, it can be directly on the other element or there may be an intermediate element present. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element present. The terms "vertical," "horizontal," "above," "below," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible embodiments.

Claims

1. A pollution prevention system for the top end cap of an adsorption tower, characterized in that: The device includes an adsorption tower and an adsorption tower top end cap. The adsorption tower top end cap is equipped with a partition plate that divides the adsorption tower top end cap into a low-purity region and a high-purity region. The high-purity region is connected to a desorbent inlet pipeline, and the low-purity region is connected to an outlet pipeline. The high-purity region is equipped with a first balance pipe that connects to the interior of the adsorption tower, and the low-purity region is equipped with a second balance pipe that connects to the interior of the adsorption tower.

2. The anti-pollution system for the top end cap of an adsorption tower according to claim 1, characterized in that: Both the first balancing tube and the second balancing tube are U-shaped tubes.

3. The anti-pollution system for the top end cap of an adsorption tower according to claim 1, characterized in that: The upper part of the partition plate has a through hole.

4. The anti-pollution system for the top end cap of an adsorption tower according to claim 1, characterized in that: The external discharge pipeline is connected to the distillation system.

5. The anti-pollution system for the top end cap of an adsorption tower according to claim 1, characterized in that: The first balance pipe is equipped with a first one-way valve to control the desorbent from entering the adsorption tower from the high-purity area.

6. The anti-pollution system for the top end cap of an adsorption tower according to claim 1, characterized in that: The second balance pipe is equipped with a second one-way valve to control the material from the adsorption tower into the low-purity zone.

7. A pollution prevention system for the top end cap of an adsorption tower according to any one of claims 1-6, characterized in that: The desorbent inlet pipeline is equipped with a first regulating valve group.

8. The anti-pollution system for the top end cap of an adsorption tower according to claim 7, characterized in that: The first regulating valve group includes a first manual valve, a first flow regulating valve, and a second manual valve arranged in sequence.

9. A pollution prevention system for the top end cap of an adsorption tower according to any one of claims 1-6, characterized in that: A second regulating valve group is installed on the external discharge pipeline.

10. The anti-pollution system for the top end cap of an adsorption tower according to claim 9, characterized in that: The second regulating valve group includes a third manual valve, a second flow regulating valve, and a fourth manual valve arranged in sequence.

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