Residual liquid recovery structure in MTBE (methyl tert-butyl ether) equipment

Abstract

The utility model discloses a raffinate recovery structure in MTBE (Methyl Tert-Butyl Ether) equipment, and particularly relates to the technical field of MTBE raffinate recovery, which comprises a desulfurizing tower, a circulating water cooler, an unqualified product emptying tank and an intermediate product tank communicated with a catalytic cracking device, a first pipeline is communicated between a water outlet of the circulating water cooler and a water inlet of the unqualified product emptying tank, a second pipeline is communicated between the unqualified product emptying tank and the intermediate product tank, and a filtering assembly is arranged between the desulfurizing tower and the circulating water cooler and comprises a filtering box. And the filter box is arranged between the desulfurizing tower and the circulating water cooler. In the process of recovering the residual liquid in the desulfurizing tower, impurities in the residual liquid can be intercepted and prevented from blocking equipment and abrading parts, stable operation of a system is guaranteed, meanwhile, the recovery and utilization rate of the residual liquid can be increased, waste and environmental protection risks are reduced, and economic and environmental protection benefits are achieved.

Description

Technical Field

[0001] This utility model relates to the field of MTBE residual liquid recovery technology, and more specifically, to a residual liquid recovery structure in MTBE equipment. Background Technology

[0002] MTBE equipment is used to produce methyl tert-butyl ether. Desulfurization is required during the production process. MTBE equipment uses a desulfurization tower for desulfurization. During the desulfurization process, a certain amount of high-sulfur residue will be generated. The high-sulfur residue will accumulate at the bottom of the desulfurization tower. The high sulfur content of the high-sulfur residue is too high to be directly sent to the finished product tank as a product. Therefore, it needs to be recycled.

[0003] A search revealed that Chinese patent CN207446209U discloses a residual liquid recovery structure in an MTBE device. This structure solves the technical problems of waste and environmental pollution caused by the direct discharge of residual liquid in existing MTBE devices, and has the advantage of realizing the recycling and reuse of residual liquid.

[0004] However, in actual use, the high-sulfur residual liquid at the bottom of the desulfurization tower inevitably contains some precipitates or metal impurities. These impurities can easily clog subsequent processing equipment and pipelines, leading to frequent equipment failures and affecting the stability of the recovery process. In view of this, this utility model proposes a residual liquid recovery structure in MTBE equipment. Utility Model Content

[0005] In order to overcome the above-mentioned defects of the prior art, the present invention provides a residual liquid recovery structure in MTBE equipment to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a residual liquid recovery structure in an MTBE equipment. The MTBE equipment includes a desulfurization tower, and the residual liquid recovery structure includes a circulating water cooler, a non-conforming product vent tank, and an intermediate product tank connected to a catalytic cracking unit. A first pipeline connects the outlet of the circulating water cooler and the inlet of the non-conforming product vent tank, and a second pipeline connects the non-conforming product vent tank and the intermediate product tank.

[0007] It can be seen that, through the cooperation of various devices and pipelines, this structure can filter, cool, and mix the residual liquid generated by the desulfurization tower and then transport it to the catalytic cracking unit for reprocessing, thereby realizing the recycling and reuse of the residual liquid.

[0008] To intercept precipitates and metal impurities in the residual liquid transported from the desulfurization tower to the circulating water cooler, and to facilitate the treatment of intercepted impurities, cleaning and replacement of the filter screen, and to ensure the sealing of the filter box and the stability of the interception frame installation, preferably, a filter assembly is provided between the desulfurization tower and the circulating water cooler. The filter assembly includes a filter box, which is installed between the desulfurization tower and the circulating water cooler. A third pipe connects the bottom of the desulfurization tower to the inlet of the filter box, and a fourth pipe connects the outlet of the filter box to the inlet of the circulating water cooler, with a hydraulic control valve installed on the fourth pipe. The filter box has an internal interception frame, and a filter screen is installed on the outer wall of the interception frame by screws. The surface of the filter box has an installation groove, and a sealing plate is installed inside the installation groove by screws. A sealing gasket is provided at the bottom of the sealing plate. Both the interception frame and the filter screen are made of stainless steel, and the interception frame is interconnected from left to right. The top of the interception frame is fixedly installed on the bottom of the sealing plate. The inner wall of the filter box has a concave groove, and the outer wall of the interception frame slides into the inner wall of the concave groove. The sealing plate has a pull groove, and the thickness of the inner wall of the interception frame is the same as the depth of the concave groove.

[0009] In order to fully mix the residual liquid with the added materials after adding other materials to the empty tank of non-conforming products through the feeding pipe, the stirring motor drives the stirring shaft and stirring blades to rotate. Preferably, the outer wall of the empty tank of non-conforming products is equipped with a stirring motor, the output end of the stirring motor is fixedly equipped with a stirring shaft, and stirring blades are fixedly installed on both sides of the outer wall of the stirring shaft. The surface of the empty tank of non-conforming products is connected to the feeding pipe. The stirring shaft and stirring blades are both located inside the empty tank of non-conforming products, and one end of the stirring shaft is rotatably connected to the inner wall of the empty tank of non-conforming products through a bearing.

[0010] The technical effects and advantages of this utility model are as follows:

[0011] By setting up a filtration component, the filter screen in the interception frame can accurately intercept the precipitates and metal impurities contained in the residual liquid. This can effectively prevent these impurities from entering the circulating water cooler with the residual liquid, clogging the heat exchange channels, and wearing down components such as the hydraulic control valve. It can also prevent impurities from accumulating in subsequent pipelines and causing poor flow, significantly reducing the equipment failure rate, ensuring the long-term stable operation of the residual liquid recovery system, and facilitating cleaning and maintenance.

[0012] Through the coordinated operation of various devices and pipelines, a complete processing chain is established, from the collection of residual liquid in the desulfurization tower, purification by the filter components, cooling by the circulating water cooler, mixing in the vent tank of unqualified products, to the transportation of intermediate products to the catalytic cracking unit for recycling. This not only significantly improves the recycling rate of residual liquid and reduces economic losses caused by material waste, but also reduces the pollution risk to the environment caused by its direct discharge through the compliant treatment and recycling of high-sulfur residual liquid, thus achieving both economic and environmental benefits. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0014] Figure 2 This is a schematic diagram of the connection structure between the stirring motor and the stirring shaft of this utility model.

[0015] Figure 3 This is a schematic diagram of the filter assembly structure of this utility model.

[0016] Figure 4 This is a schematic diagram of the connection structure between the interception frame and the filter box of this utility model.

[0017] Figure 5 This is a schematic diagram of the connection structure between the filter and the interception frame of this utility model.

[0018] Figure 6 This is a schematic diagram of the surface structure of the filter box of this utility model.

[0019] The attached diagram is labeled as follows: 1. Desulfurization tower; 2. Circulating water cooler; 3. Non-conforming product venting tank; 4. Intermediate product tank; 5. First pipeline; 6. Second pipeline; 7. Filter box; 8. Interception frame; 9. Filter screen; 10. Mounting groove; 11. Sealing plate; 12. Sealing gasket; 13. Agitator motor; 14. Agitator shaft; 15. Agitator blade; 16. Feed pipe; 17. Third pipeline; 18. Fourth pipeline; 19. Hydraulic control valve; 20. Concave groove. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] As attached Figure 1-6The residual liquid recovery structure in the MTBE equipment shown includes a desulfurization tower 1 and a circulating water cooler 2, a non-conforming product vent tank 3 and an intermediate product tank 4 connected to the catalytic cracking unit. A first pipeline 5 connects the outlet of the circulating water cooler 2 and the inlet of the non-conforming product vent tank 3, and a second pipeline 6 connects the non-conforming product vent tank 3 and the intermediate product tank 4.

[0022] Specifically, in this structure, desulfurization tower 1 is an MTBE device. The high-sulfur residue generated during the production process of desulfurization tower 1 is collected at the bottom of the inner cavity of desulfurization tower 1. The residue recovery structure consists of a circulating water cooler 2, a non-conforming product vent tank 3, and an intermediate product tank 4 connected to the catalytic cracking unit.

[0023] The high-sulfur residue at the bottom of the desulfurization tower 1 is transported to the circulating water cooler 2 for cooling through pipelines. The residual liquid, which is about 68-85℃, is cooled to room temperature of 30-40℃. The cooled residual liquid enters the unqualified product vent tank 3 through the first pipeline 5 for storage. Other materials can be added to the residual liquid in the unqualified product vent tank 3 for mixing, such as catalytic cracking feedstock oil, light C5 components, and circulating oil slurry. When the residual liquid in the unqualified product vent tank 3 reaches a level greater than 80%, the residual liquid mixed with other materials is transported to the intermediate product tank 4 through the second pipeline 6. The intermediate product tank 4 is connected to the catalytic cracking unit. Finally, the residual liquid mixed with other materials is recycled to obtain recycled products, thus avoiding waste of materials.

[0024] It is worth noting that the circulating water cooler 2 and the catalytic cracking unit are existing units and will not be described in detail.

[0025] In this embodiment, as shown in the appendix Figure 1 , 3As shown in Figures 4, 5, and 6, a filter assembly is installed between the desulfurization tower 1 and the circulating water cooler 2. The filter assembly includes a filter box 7, which is installed between the desulfurization tower 1 and the circulating water cooler 2. A third pipe 17 connects the bottom of the desulfurization tower 1 and the inlet of the filter box 7. A fourth pipe 18 connects the outlet of the filter box 7 and the inlet of the circulating water cooler 2, and a hydraulic control valve 19 is installed on the fourth pipe 18. An interception frame 8 is installed inside the filter box 7, and a filter screen 9 is installed on the outer wall of the interception frame 8 by screws. The surface of the filter box 7 has an installation groove 10. A sealing plate 11 is installed inside the installation groove 10 by screws. A sealing gasket 12 is provided at the bottom of the sealing plate 11. The interception frame 8 and the filter screen 9 are both made of stainless steel. The interception frame 8 is interconnected on both sides. The top of the interception frame 8 is fixedly installed at the bottom of the sealing plate 11. The inner wall of the filter box 7 has a concave groove 20. The outer wall of the interception frame 8 is slidably engaged with the inner wall of the concave groove 20. The sealing plate 11 has a pull groove. The thickness of the inner wall of the interception frame 8 is the same as the depth of the concave groove 20.

[0026] Specifically, in this structure, some precipitates or metal impurities will inevitably be generated in the high-sulfur residual liquid at the bottom of the inner cavity of the desulfurization tower 1. Before being transported to the circulating water cooler 2, the high-sulfur residual liquid at the bottom of the inner cavity of the desulfurization tower 1 is transported to the interior of the filter box 7 through the third pipeline 17 and enters the interception frame 8. The precipitates or metal impurities are intercepted by the filter screen 9 on the outer wall of the interception frame 8. At this time, the precipitates or metal impurities are intercepted inside the interception frame 8 and located on the left side of the filter screen 9.

[0027] The residual liquid after being filtered by filter screen 9 is transported to the interior of circulating water cooler 2 through the fourth pipeline 18 to avoid clogging of circulating water cooler 2 and other pipelines. The amount of residual liquid entering circulating water cooler 2 is controlled by hydraulic control valve 19 to ensure that the amount of residual liquid in circulating water cooler 2 is moderate and to ensure the cooling effect.

[0028] The operator then removes the screws at the sealing plate 11 and lifts the sealing plate 11 upwards through the pull groove, causing the sealing plate 11 to pull the intercepting frame 8 out of the filter box 7 through the mounting groove 10. At this time, the outer wall of the intercepting frame 8 slides through the concave slot 20 opened in the filter box 7 to guide the intercepting frame 8 and the filter screen 9 out of the filter box 7. Since the sediment or metal impurities are intercepted inside the intercepting frame 8 and located on the left side of the filter screen 9, it is convenient to process and collect the sediment or metal impurities intercepted in the intercepting frame 8, and it is also convenient to clean the filter screen 9. The filter screen 9 can be connected to the outer wall of the intercepting frame 8 by screws, which makes it convenient to disassemble and replace the filter screen 9.

[0029] Similarly, the interceptor frame 8 is reinstalled inside the filter box 7 through the mounting groove 10, and the outer wall of the interceptor frame 8 is slidably guided to the filter box 7 through the concave groove 20 to ensure that the interceptor frame 8 is filled into the concave groove 20 and to improve the stability of the installation of the interceptor frame 8. The sealing plate 11 is installed inside the mounting groove 10 with screws, and the sealing gasket 12 is used to increase the sealing performance, thus completing the installation of the interceptor frame 8 and the filter screen 9.

[0030] In this embodiment, as shown in the appendix Figure 1 , 2 As shown, a stirring motor 13 is installed on the outer wall of the unqualified product venting tank 3. A stirring shaft 14 is fixedly installed at the output end of the stirring motor 13. Stirring blades 15 are fixedly installed on both sides of the outer wall of the stirring shaft 14. A feeding pipe 16 is connected to the surface of the unqualified product venting tank 3. The stirring motor 13 is fixedly installed on the outer wall of the unqualified product venting tank 3. The stirring shaft 14 and the stirring blades 15 are both located inside the unqualified product venting tank 3, and one end of the stirring shaft 14 is rotatably connected to the inner wall of the unqualified product venting tank 3 through a bearing.

[0031] Specifically, in this structure, when the residual liquid inside the qualified product venting tank can be mixed with other materials, the materials are added to the inside of the unqualified product venting tank 3 through the feeding pipe 16. At this time, the stirring motor 13 drives the stirring shaft 14 to rotate inside the unqualified product venting tank 3, and drives the stirring blade 15 to rotate, thereby improving the mixing effect of the residual liquid and other materials.

[0032] Working principle of this utility model:

[0033] This application provides a residual liquid recovery structure in MTBE equipment. In specific use, firstly, the high-sulfur residual liquid generated during the production process of desulfurization tower 1 will naturally collect at the bottom of its inner cavity. This residual liquid is first transported to filter box 7 through the third pipeline 17 and enters the interception frame 8 inside the filter box 7. The filter screen 9 on the outer wall of the interception frame 8 will intercept the precipitates, metal impurities, etc. in the residual liquid. The filtered clean residual liquid then flows to circulating water cooler 2 through the fourth pipeline 18. The hydraulic control valve 19 can adjust the flow rate of residual liquid entering the circulating water cooler 2 to ensure stable cooling effect.

[0034] Next, the residual liquid entering the circulating water cooler 2 is cooled to a normal temperature of 30-40℃. The cooled residual liquid is transported to the non-conforming product venting tank 3 through the first pipeline 5 for storage. When other materials need to be added, the materials can be injected into the non-conforming product venting tank 3 through the feeding pipe 16. At the same time, the stirring motor 13 drives the stirring shaft 14 and stirring blade 15 to rotate, so that the residual liquid and the added materials are fully mixed.

[0035] Finally, when the liquid level of the mixed residual liquid in the non-conforming product venting tank 3 exceeds 80%, the mixed liquid is transported to the intermediate product tank 4 through the second pipeline 6. Since the intermediate product tank 4 is connected to the catalytic cracking unit, the mixed residual liquid eventually enters the catalytic cracking unit for reprocessing and is transformed into reprocessing products, thereby realizing the recycling and reuse of residual liquid and avoiding material waste.

[0036] All contents not described in detail in the specification are existing technologies known to those skilled in the art, and the model parameters of each electrical appliance are not specifically limited; conventional equipment can be used. Electrical control components not mentioned in this technical solution are not shown in the figures because they are existing technologies, and will not be described here.

[0037] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. Structure for recovering residual liquid in an MTBE plant, comprising a desulfurization column (1), characterized in that: The residual liquid recovery structure includes a circulating water cooler (2), a non-conforming product vent tank (3), and an intermediate product tank (4) connected to the catalytic cracking unit. A first pipeline (5) connects the outlet of the circulating water cooler (2) and the inlet of the non-conforming product vent tank (3). A second pipeline (6) connects the non-conforming product vent tank (3) and the intermediate product tank (4). A filter assembly is provided between the desulfurization tower (1) and the circulating water cooler (2). The filter assembly includes a filter box (7), which is installed between the desulfurization tower (1) and the circulating water cooler (2). An interception frame (8) is provided inside the filter box (7). A filter screen (9) is installed on the outer wall of the interception frame (8) by screws. An installation groove (10) is provided on the surface of the filter box (7). A sealing plate (11) is installed inside the installation groove (10) by screws, and a sealing gasket (12) is provided at the bottom of the sealing plate (11).

2. The residual liquid recovery structure in the MTBE apparatus according to claim 1, characterized by: The outer wall of the unqualified product venting tank (3) is equipped with a stirring motor (13), the output end of the stirring motor (13) is fixedly equipped with a stirring shaft (14), and stirring blades (15) are fixedly installed on both sides of the outer wall of the stirring shaft (14). The surface of the unqualified product venting tank (3) is connected to a feeding pipe (16).

3. The residual liquid recovery structure in the MTBE apparatus according to claim 2, characterized by: The stirring shaft (14) and stirring blade (15) are both located inside the non-conforming product venting tank (3), and one end of the stirring shaft (14) is rotatably connected to the inner wall of the non-conforming product venting tank (3) through a bearing.

4. The residual recovery structure in the MTBE plant according to claim 1, characterized by: A third pipeline (17) is connected between the bottom of the desulfurization tower (1) and the inlet of the filter box (7), and a fourth pipeline (18) is connected between the outlet of the filter box (7) and the inlet of the circulating water cooler (2), and a liquid control valve (19) is installed on the fourth pipeline (18).

5. The residual liquid recovery structure in the MTBE equipment according to claim 1, characterized in that: Both the interception frame (8) and the filter screen (9) are made of stainless steel, and the interception frame (8) is interconnected on both sides. The top of the interception frame (8) is fixedly installed on the bottom of the sealing plate (11).

6. The residual liquid recovery structure in the MTBE equipment according to claim 1, characterized in that: The filter box (7) has a concave groove (20) on its inner wall. The outer wall of the interception frame (8) is slidably engaged with the inner wall of the concave groove (20). The sealing plate (11) has a pull groove. The thickness of the inner wall of the interception frame (8) is the same as the opening depth of the concave groove (20).

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