Recovery tower for diethyl carbonate production

Abstract

The utility model discloses a recovery tower for diethyl carbonate production, and belongs to the technical field of chemical product recovery. Comprising a recovery tower body, a plurality of condensing plates which are sequentially arranged in the recovery tower body from top to bottom and are arranged in a staggered manner, a cooling device connected with the condensing plates, a scraper plate which is arranged between two adjacent condensing plates and abuts against the two condensing plates, and a driving device for driving the scraper plate to move back and forth in the horizontal direction, the gas inlet pipe is arranged on the side wall of the recovery tower body and is positioned below the condensation plate; the recovery tower body is of a hexahedron structure; the uppermost condensing plate is fixedly connected with the inner top wall of the recovery tower body and occupies the inner top wall of the whole recovery tower body. Through the synergistic effect of the devices, the cooling sufficiency can be improved, meanwhile, liquid diethyl carbonate attached to the sides, close to each other, of the adjacent cooling plates can be scraped off, and the diethyl carbonate collection rate is increased.

Description

Technical Field

[0001] This utility model relates to the field of chemical product recycling technology, and in particular to a recycling tower for diethyl carbonate production. Background Technology

[0002] Diethyl carbonate (CAS: 105-58-8) is the dicarbonate of ethanol and is a colorless, clear liquid at room temperature. It is mainly used as a solvent for nitrocellulose, resins, and some pharmaceuticals (such as erythromycin), and as an intermediate in organic synthesis (such as phenobarbital and pyrethroids).

[0003] The patent application number CN202323488617.6 discloses a recovery tower for the production of diethyl carbonate, which cools the diethyl carbonate gas only by a condenser plate set at the top of the condensation chamber. In actual cooling, insufficient cooling occurs. Utility Model Content

[0004] The purpose of this invention is to provide a recovery tower for diethyl carbonate production, so as to at least achieve the goal of improving the cooling efficiency.

[0005] The objective of this utility model is achieved through the following technical solution:

[0006] A recovery tower for diethyl carbonate production includes a recovery tower body, multiple condensing plates arranged sequentially from top to bottom within the recovery tower body and staggered among them, a cooling device connected to the condensing plates, a scraper disposed between two adjacent condensing plates and abutting against both condensing plates, a driving device for driving the scraper to move back and forth in the horizontal direction, and an air inlet pipe disposed on the side wall of the recovery tower body and located below the condensing plates; the recovery tower body has a hexahedral structure; the uppermost condensing plate is fixedly connected to the inner top wall of the recovery tower body and occupies the entire inner top wall of the recovery tower body.

[0007] Preferably, each of the condenser plates has an "S"-shaped condenser tube installed in its cavity.

[0008] Preferably, the cooling device includes an outlet pipe connected to the common outlet ends of the plurality of condenser tubes, a cooler connected to the outlet end of the outlet pipe, a liquid tank connected to the outlet end of the cooler, an inlet pipe connected to the outlet end of the liquid tank, and a circulation pump installed on the outlet pipe; the inlet end of each condenser tube penetrates the side wall of the recovery tower body and is connected to the inlet pipe.

[0009] Preferably, the scraping device includes a scraper disposed on the inner wall of the recovery tower body, and a hydraulic rod disposed on the side wall of the recovery tower body with its telescopic end connected to the scraper; both ends of the scraper are slidably connected to the inner wall of the recovery tower body, and the top and bottom ends of the scraper abut against condensation plates located at its top and bottom ends, respectively.

[0010] Preferably, each scraper is provided with a slider at both ends, and the inner wall of the recovery tower body is provided with a horizontal groove that slides in cooperation with the slider.

[0011] Preferably, both ends of the scraper abut against the inner wall of the recovery tower body.

[0012] Preferably, the bottom of the recovery tower body is provided with a support leg, and a drain pipe is provided at the center of the bottom wall of the recovery tower body. The bottom wall of the recovery tower body is inclined downward along the direction of the drain pipe.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] By arranging multiple staggered condenser plates from top to bottom within the recovery tower body, diethyl carbonate gas can be cooled in multiple stages. At the same time, the contact area between diethyl carbonate and the condenser plates is significantly increased, thereby improving the cooling effect and the degree of cooling.

[0015] By setting a scraper that abuts against both adjacent condensing plates between them, and a drive device that drives the scraper to move back and forth in the horizontal direction, the drive device can be activated after condensation is completed, causing the scraper between the two adjacent condensing plates to move horizontally. During the movement, its top and bottom ends abut against the two adjacent condensing plates respectively. The movement of the scraper can scrape off the liquid diethyl carbonate adhering to the side of the two adjacent condensing plates that is close to each other (i.e., the bottom wall of the upper condensing plate and the top wall of the lower condensing plate), thus preventing the liquid diethyl carbonate from adhering to the side of the two adjacent condensing plates that is close to each other, which would reduce the yield of diethyl carbonate. Attached Figure Description

[0016] Figure 1 This is a schematic cross-sectional view of Example 1 from the front view.

[0017] Figure 2 for Figure 1 A top-view cross-sectional view of the uppermost condenser plate;

[0018] Figure 3 for Figure 1 A cross-sectional view of the scraper at the top of the lowest condenser plate in the middle, viewed from above.

[0019] Figure 4 for Figure 1 A cross-sectional view of the structure after the horizontal chute is installed, viewed from the front.

[0020] Figure 5 for Figure 4 A schematic diagram of the structure of the middle scraper and the horizontal chute from a side view;

[0021] In the diagram: 1-Recovery tower body, 2-Condensing plate, 3-Scraper, 4-Inlet pipe, 5-Cavity, 6-Condensing pipe, 7-Outlet pipe, 8-Cooler, 9-Liquid tank, 10-Inlet pipe, 11-Circulation pump, 12-Hydraulic rod, 13-Slider, 14-Horizontal chute, 15-Support leg, 16-Drain pipe. Detailed Implementation

[0022] Example 1

[0023] A recovery tower for diethyl carbonate production, such as Figure 1 As shown, the system includes a recovery tower body 1, multiple condensing plates 2 arranged alternately from top to bottom within the recovery tower body 1, a cooling device connected to the condensing plates 2, a scraper 3 disposed between adjacent condensing plates 2 and abutting against both condensing plates 2, a driving device for driving the scraper 3 to move back and forth in the horizontal direction, and an air inlet pipe 4 disposed on the side wall of the recovery tower body 1 and located below the condensing plates 2; the recovery tower body 1 has a hexahedral structure; the uppermost condensing plate 2 is fixedly connected to the inner top wall of the recovery tower body 1 and occupies the entire inner top wall of the recovery tower body 1. Further, as... Figure 2 As shown, each of the condenser plates 2 has an "S"-shaped condenser tube 6 installed in its cavity 5. It is worth noting that... Figure 1 The condenser tube 6 is not drawn inside the central condenser plate 2. Furthermore, as... Figure 1 As shown, the cooling device includes an outlet pipe 7 connected to the common outlet ends of multiple condenser pipes 6, a cooler 8 (existing technology) connected to the outlet end of the outlet pipe 7, a liquid tank 9 connected to the outlet end of the cooler 8 (both the liquid tank 9 and the cooler 8 can be installed on the ground), an inlet pipe 10 connected to the outlet end of the liquid tank 9, and a circulation pump 11 installed on the outlet pipe 7; the inlet end of each condenser pipe 6 penetrates the side wall of the recovery tower body 1 and is connected to the inlet pipe 10. The inlet pipe 10 and the outlet pipe 7 are flexible hoses, and both are equipped with valves (existing technology, not shown in the figure). Further, as... Figure 1 and Figure 3As shown, the scraping device includes a scraper 3 disposed on the inner wall of the recovery tower body 1, and a hydraulic rod 12 disposed on the side wall of the recovery tower body 1 with its telescopic end connected to the scraper 3; both ends of the scraper 3 are slidably connected to the inner wall of the recovery tower body 1, and the top and bottom ends of the scraper 3 abut against the condenser plate 2 located at its top and bottom ends, respectively.

[0024] Working Principle: Under the action of the circulating pump 11, the coolant stored in the liquid tank 9 is introduced into the condenser tubes 6 of each condenser plate 2 through the inlet pipe 10. After the condenser tubes 6 are full, the circulating pump 11, as well as the valves on the inlet pipe 10 and the outlet pipe 7, are closed. Subsequently, diethyl carbonate gas is introduced into the recovery tower body 1 along the gas inlet pipe 4. During the upward diffusion of the diethyl carbonate gas, it comes into contact with multiple condenser plates 2 to achieve sufficient cooling. The cooled diethyl carbonate liquefies and flows down or falls to the bottom wall of the recovery tower body 1. After the condenser plates 2 have cooled for a period of time, the circulating pump 11, as well as the valves on the inlet pipe 10 and the outlet pipe 7, are opened, allowing the coolant on the condenser plates 2 to be guided to the cooler 8 for cooling along the outlet pipe 7. At this time, new coolant in the liquid tank 9 is added to multiple condenser plates 2 along the inlet pipe 10, and cooling is carried out in the above manner. The coolant with a higher temperature introduced into the cooler 8 is cooled by the cooler 8. During the cooling process, a water pump (existing technology, not shown in the figure) installed on the pipe between the cooler 8 and the liquid tank 9 is turned on to guide the cooled coolant in the cooler 8 to the liquid tank 9 for temporary storage.

[0025] After the diethyl carbonate gas has condensed, turn off the circulation pump 11 and the water pump. Then, open multiple hydraulic rods 12 sequentially from top to bottom. Specifically, open the topmost hydraulic rod 12 first, causing the topmost scraper 3 to move horizontally. During the movement, because its top and bottom ends abut against two adjacent condensing plates 2, the movement of the scraper 3 can scrape off the liquid diethyl carbonate adhering to the side of the two adjacent condensing plates 2 that is close to each other (i.e., the bottom wall of the upper condensing plate 2 and the top wall of the lower condensing plate 2), thus preventing the liquid diethyl carbonate from adhering to the side of the two adjacent condensing plates 2 that is close to each other, which would reduce the diethyl carbonate yield.

[0026] During the scraping process, liquid diethyl carbonate falls onto the condenser plate 2 below. Then, the second hydraulic rod 12 (counting from top to bottom) is activated to scrape the material in the same way. After the scraping is completed, the third hydraulic rod 12 (counting from top to bottom) is activated, and so on, until all the scrapers 3 have finished working.

[0027] Through the synergistic effect of the above-mentioned devices, not only can the cooling efficiency be improved, but also the liquid diethyl carbonate adhering to the adjacent cooling plates on the side closest to each other can be scraped off, thereby improving the diethyl carbonate collection rate.

[0028] Example 2

[0029] Based on Example 1, such as Figure 4 and Figure 5 As shown, each scraper 3 has a slider 13 at both ends, and the inner wall of the recovery tower body 1 has a horizontal groove 14 that slides with the slider 13. By setting the slider 13 and the horizontal groove 14, the scraper 3 is limited, ensuring that it always moves back and forth along the length of the horizontal groove 14. Furthermore, both ends of the scraper 3 abut against the inner wall of the recovery tower body 1, so that when the scraper 3 moves, it can scrape off the portion of liquid diethyl carbonate adhering to the side wall of the recovery tower body 1 between adjacent condensing plates 2, thereby improving the diethyl carbonate collection rate. Further, as... Figure 1 As shown, the bottom of the recovery tower body 1 is provided with a support leg 15, and a drain pipe 16 is provided at the center of the bottom wall of the recovery tower body 1. The bottom wall of the recovery tower body 1 is inclined downward along the direction of the drain pipe 16. In this solution, liquid diethyl carbonate located in the recovery tower body 1 can be discharged through the drain pipe 16. A valve (existing technology, not shown in the figure) is provided on the drain pipe 16.

Claims

1. A recovery tower for diethyl carbonate production, characterized in that, The system includes a recovery tower body (1), multiple condenser plates (2) arranged sequentially from top to bottom within the recovery tower body (1) and staggered among each other, a cooling device connected to the condenser plates (2), a scraper (3) arranged between two adjacent condenser plates (2) and abutting against both condenser plates (2), a driving device for driving the scraper (3) to move back and forth in the horizontal direction, and an air inlet pipe (4) arranged on the side wall of the recovery tower body (1) and located below the condenser plates (2); the recovery tower body (1) has a hexahedral structure; the uppermost condenser plate (2) is fixedly connected to the inner top wall of the recovery tower body (1) and occupies the entire inner top wall of the recovery tower body (1).

2. The recovery tower for diethyl carbonate production according to claim 1, characterized in that, Each of the condenser plates (2) has an "S"-shaped condenser tube (6) installed in its cavity (5).

3. The recovery tower for diethyl carbonate production according to claim 2, characterized in that, The cooling device includes an outlet pipe (7) connected to the outlet ends of multiple condenser pipes (6), a cooler (8) connected to the outlet end of the outlet pipe (7), a liquid tank (9) connected to the outlet end of the cooler (8), an inlet pipe (10) connected to the outlet end of the liquid tank (9), and a circulation pump (11) installed on the outlet pipe (7); the inlet end of each condenser pipe (6) penetrates the side wall of the recovery tower body (1) and is connected to the inlet pipe (10).

4. The recovery tower for diethyl carbonate production according to claim 1, characterized in that, It also includes a scraping device, which includes a scraper (3) disposed on the inner wall of the recovery tower body (1) and a hydraulic rod (12) disposed on the side wall of the recovery tower body (1) and connected to the scraper (3) at its telescopic end; the two ends of the scraper (3) are slidably connected to the inner wall of the recovery tower body (1) respectively, and the top and bottom ends of the scraper (3) abut against the condenser plate (2) located at its top and bottom ends respectively.

5. A recovery tower for diethyl carbonate production according to claim 4, characterized in that, Each scraper (3) is provided with a slider (13) at both ends, and the inner wall of the recovery tower body (1) is provided with a horizontal groove (14) that slides with the slider (13).

6. A recovery tower for diethyl carbonate production according to claim 5, characterized in that, The two ends of the scraper (3) abut against the inner wall of the recovery tower body (1).

7. A recovery tower for diethyl carbonate production according to claim 1, characterized in that, The bottom of the recovery tower body (1) is provided with a support leg (15), and a drain pipe (16) is provided at the center of the bottom wall of the recovery tower body (1). The bottom wall of the recovery tower body (1) is inclined downward along the direction of the drain pipe (16).

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