Recovery tower condensing device for N-methylaniline production

Abstract

The utility model discloses a recovery tower condensing device for N-methylaniline production, which comprises a tube nest condenser, one end of the tube nest condenser is respectively provided with a refrigerant inlet and a refrigerant inlet, the refrigerant inlet and the refrigerant inlet are connected with a tube pass, the bottom end of the tube nest condenser is respectively provided with an air inlet and a liquid outlet, and the liquid outlet is connected with the air inlet. A tail gas discharge port is formed in the top end of the tube bundle condenser; a refrigerant filter plate is installed in the end, close to the refrigerant inlet, of the tube nest condenser, a refrigerant through opening is formed in the refrigerant filter plate and is of a fan-shaped structure, a filter screen is arranged in the refrigerant through opening, and an automatic cleaning mechanism is arranged on the side, close to the refrigerant inlet, of the refrigerant filter plate. The scraper blade is driven by the rotating column to periodically clean and scrape the refrigerant filter screen, impurities are automatically cleaned and collected in combination with a negative pressure suction system, the filter screen is effectively prevented from being blocked, and the condensation efficiency and the continuity of equipment operation are remarkably improved.

Description

Technical Field

[0001] This utility model relates to the field of N-methylaniline production technology, and in particular to a recovery tower condensation device for N-methylaniline production. Background Technology

[0002] In the final separation stage of N-methylaniline production, crude N-methylaniline is uniformly mixed and then pumped to a methanol tower. In the methanol tower, methanol is recovered by distillation at atmospheric pressure and a temperature of 60-75°C at the top. Other components enter an aniline azeotropic distillation tower for treatment. Aniline and water are azeotropically distilled off at -0.09 MPa and 150-170°C in the upper part of the tower. The gaseous medium is condensed in a condenser and separated into layers under 5% brine. The organic phase enters the aniline tower. The inorganic phase enters a wastewater tower for aniline recovery, and the remaining wastewater is treated in an environmental protection facility. The aniline tower azeotropically distills at 102°C at the top, and its gaseous medium is condensed in the aniline recovery tower condenser.

[0003] The condensation and recovery of the gaseous medium at the top of the aniline tower is a crucial step in the process flow. In existing technologies, tube condensers achieve condensation through heat exchange between the refrigerant and the gaseous medium; however, the following problems have been observed in practical applications:

[0004] Filters are prone to clogging and require frequent maintenance: Refrigerants often contain particulate matter or impurities from pipe corrosion. Traditional filters lack self-cleaning capabilities, and the accumulation of impurities reduces the flow cross-sectional area, decreases refrigerant flow, and significantly reduces heat exchange efficiency. Frequent shutdowns for manual cleaning are necessary, affecting production continuity and increasing maintenance costs.

[0005] High risk of secondary contamination from impurities: During the cleaning process of traditional filter devices, impurities scraped off are easily carried back with the refrigerant or scattered onto the inner wall of the tubes, causing refrigerant contamination and local blockage of the tubes. Long-term accumulation can lead to heat transfer deterioration and even induce equipment corrosion problems.

[0006] High dependence on manual intervention: Existing condensation devices lack an integrated impurity removal system. Filter cleaning and impurity collection rely on manual operation, which is not only inefficient but also poses a safety hazard of operators coming into contact with harmful chemicals.

[0007] The aforementioned shortcomings make it difficult for existing condensation units to meet the demands of continuous and efficient N-methylaniline production, especially under high-load conditions, where equipment stability and environmental performance face severe challenges. Therefore, there is an urgent need for a condensation unit capable of self-cleaning filters, simultaneous removal of impurities, and requiring minimal maintenance to ensure production efficiency and process safety. Utility Model Content

[0008] To address the problems mentioned in the background section, this invention provides a recovery tower condensation device for the production of N-methylaniline.

[0009] To achieve the above objectives, the present invention adopts the following technical solution:

[0010] A condensing device for a recovery tower in the production of N-methylaniline includes a tube condenser, one end of which is provided with a refrigerant inlet and a refrigerant outlet, which are connected to the tube side; the bottom end of the tube condenser is provided with an air inlet and a liquid outlet, and the top end of the tube condenser is provided with a tail gas outlet.

[0011] The tube condenser has a refrigerant filter plate installed inside the end near the refrigerant inlet. The refrigerant filter plate has a refrigerant inlet with a fan-shaped structure and a filter screen inside. The refrigerant filter plate also has an automatic cleaning mechanism on the side near the refrigerant inlet.

[0012] The automatic cleaning mechanism includes a rotating column, one end of which extends into the interior of the tube condenser and is connected to a scraper that contacts the filter screen.

[0013] Preferably, the rotating column is hollow inside, and a support conduit is connected to the outer side of one end of the rotating column inside the tube condenser. The support conduit has a rectangular opening on the side near the filter screen.

[0014] Preferably, a suction collection hood is provided on the outside of the rectangular opening, a scraper is elastically installed inside the suction collection hood, and the end of the rotating column away from the filter screen extends to the outside of the tube condenser and is connected to a suction connection pipe through a rotary joint. The suction connection pipe is connected to a negative pressure device.

[0015] Preferably, a slide rail is installed on the inner wall of the suction and collection hood, the scraper is slidably installed on the slide rail, and a spring is installed inside the slide rail.

[0016] Preferably, a helical guide rail is installed on the outside of the rotating column, and a groove is formed on the side of the helical guide rail away from the rotating column.

[0017] Preferably, a push rod motor is fixed to the outer wall of the tube condenser by a bracket, and a limit rod is fixed to the output shaft of the push rod motor, with one end of the limit rod extending into the slide groove.

[0018] Compared with the prior art, the beneficial effects of this utility model are:

[0019] 1. Automated cleaning and anti-clogging design: The rotating column drives the scraper to periodically clean the refrigerant filter screen. Combined with the negative pressure suction system, it realizes the automatic removal and collection of impurities, effectively avoids filter screen clogging, and significantly improves condensation efficiency and equipment operation continuity.

[0020] 2. Integrated suction and anti-pollution design: The linkage design of the suction and collection hood and the hollow rotating column can simultaneously remove impurities during the cleaning process, avoiding secondary pollution of the refrigerant or blockage of the pipeline, ensuring the cleanliness of the system and improving the environmental protection and safety of the N-methylaniline production process. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a perspective view of the tube condenser of this utility model;

[0023] Figure 2 This is a front view of the tube condenser of this utility model;

[0024] Figure 3 This is a first-view structural schematic diagram of the refrigerant filter plate of this utility model.

[0025] Figure 4 This is a second-view structural schematic diagram of the refrigerant filter plate of this utility model;

[0026] Figure 5 This is a third-view structural diagram of the refrigerant filter plate of this utility model.

[0027] Figure 6 This is a first-view structural diagram of the automatic cleaning mechanism of this utility model;

[0028] Figure 7 This is a second-view structural schematic diagram of the automatic cleaning mechanism of this utility model;

[0029] Figure 8 This is a third-view structural diagram of the automatic cleaning mechanism of this utility model;

[0030] Figure 9 for Figure 8 Enlarged detail image of position A in the middle;

[0031] In the diagram: 1. Shell and tube condenser; 101. Refrigerant inlet; 102. Refrigerant entrance; 103. Air inlet; 104. Exhaust outlet; 105. Drain outlet; 2. Refrigerant filter plate; 201. Refrigerant inlet; 3. Rotating column; 301. Rotary joint; 302. Rotary joint; 303. Spring; 304. Suction hood; 305. Scraper; 306. Helical guide rail; 307. Slide rail; 308. Spring; 4. Push rod motor; 401. Limit rod. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0033] Example

[0034] Reference Figure 1-9 A condensation device for a recovery tower used in the production of N-methylaniline includes a tube condenser 1. One end of the tube condenser 1 is provided with a refrigerant inlet 101 and a refrigerant inlet 102, which are connected to the tube side. The bottom end of the tube condenser 1 is provided with an air inlet 103 and a liquid outlet 105, and the top end of the tube condenser 1 is provided with a tail gas outlet 104.

[0035] The gaseous medium at the top of the aniline tower enters the shell side of the tube condenser 1 through the inlet 103, and the refrigerant enters the tube side of the tube condenser 1 through the refrigerant inlet 101. Through heat exchange, the gaseous medium is cooled and then flows out from the refrigerant inlet 101. The gaseous medium is liquefied, and the liquid flows out through the drain port 105. The non-condensable gas is discharged from the tail gas outlet 104.

[0036] A refrigerant filter plate 2 is installed inside the tube condenser 1 near the refrigerant inlet 101. The refrigerant filter plate 2 has a refrigerant inlet 201 with a fan-shaped structure. A filter screen is installed inside the refrigerant inlet 201. An automatic cleaning mechanism is provided on the side of the refrigerant filter plate 2 near the refrigerant inlet 101.

[0037] The refrigerant can be filtered through the refrigerant filter plate 2, thereby filtering out impurities in the refrigerant. After filtration, it enters the tubes of the tube condenser 1, which can prevent impurities from clogging the tubes and from accumulating on the inner wall of the tubes, thus preventing a reduction in heat exchange efficiency.

[0038] The automatic cleaning mechanism includes a rotating column 3, one end of which extends into the interior of the tube condenser 1 and is connected to a scraper 305, which contacts the filter screen.

[0039] The rotation of the rotating column 3 drives the scraper 305 to clean the filter screen, thereby actively removing the impurities accumulated on the filter screen and improving the filtration efficiency of the filter screen.

[0040] The rotating column 3 is hollow inside. One end of the rotating column 3 located inside the tube condenser 1 is connected to a support conduit 303. The support conduit 303 has a rectangular opening on the side near the filter screen. A suction collection hood 304 is located on the outside of the rectangular opening. A scraper 305 is elastically installed inside the suction collection hood 304. The end of the rotating column 3 away from the filter screen extends to the outside of the tube condenser 1 and is connected to a suction connection pipe 302 through a rotary joint 301. The suction connection pipe 302 is connected to a negative pressure device.

[0041] The negative pressure device generates suction force, which is used to draw out the impurities scraped off by the scraper 305. The impurities are collected in the suction collection hood 304 and enter the rotating column 3, and finally discharged from the suction connection pipe 302, thus achieving the purpose of efficiently collecting the filtered impurities and keeping the filter screen clean.

[0042] Among them, a slide rail 307 is installed on the inner wall of the suction and collection hood 304, a scraper 305 is slidably installed on the slide rail 307, and a spring 308 is installed inside the slide rail 307.

[0043] The spring force of spring 308 can maintain the pressure of scraper 305 on the filter screen during cleaning, thereby improving the scraping effect.

[0044] Among them, a helical guide rail 306 is installed on the outside of the rotating column 3. A sliding groove is opened on the side of the helical guide rail 306 away from the rotating column 3. A push rod motor 4 is fixed on the outer wall of the tube condenser 1 by a bracket. A limit rod 401 is fixed on the output shaft of the push rod motor 4. One end of the limit rod 401 extends into the sliding groove.

[0045] The push rod motor 4 drives the limit rod 401 to rise and fall. The limit rod 401 moves in the slide groove, which drives the rotating column 3 to rotate back and forth, thereby driving the scraper 305 to scrape away the impurities accumulated on the filter screen.

[0046] 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.

[0047] In this utility model, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," "join," and "fix" 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, 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. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0048] The control method of this utility model is automatic control through a controller. The control circuit of the controller can be implemented by simple programming by those skilled in the art. The power supply is also common knowledge in the field. Since this utility model is mainly used to protect mechanical devices, the control method and circuit connection will not be explained in detail.

[0049] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A recovery tower condenser for N-methylaniline production, comprising a tube condenser (1), characterized in that: One end of the tube condenser (1) is provided with a refrigerant inlet (101) and a refrigerant outlet (102), which are connected to the tube side. The bottom end of the tube condenser (1) is provided with an air inlet (103) and a liquid outlet (105), and the top end of the tube condenser (1) is provided with a tail gas outlet (104). The tube condenser (1) has a refrigerant filter plate (2) installed inside the end near the refrigerant inlet (101). The refrigerant filter plate (2) has a refrigerant inlet (201) with a fan-shaped structure and a filter screen inside. The refrigerant filter plate (2) has an automatic cleaning mechanism on the side near the refrigerant inlet (101). The automatic cleaning mechanism includes a rotating column (3), one end of which extends into the interior of the tube condenser (1) and is connected to a scraper (305), which contacts the filter screen.

2. The condensation device for the recovery tower in the production of N-methylaniline according to claim 1, characterized in that: The rotating column (3) is hollow inside. One end of the rotating column (3) located inside the tube condenser (1) is connected to a support conduit (303). The support conduit (303) has a rectangular opening on the side near the filter screen.

3. A condensation device for a recovery tower in the production of N-methylaniline according to claim 2, characterized in that: A suction collection hood (304) is provided on the outside of the rectangular opening. A scraper (305) is elastically installed inside the suction collection hood (304). The end of the rotating column (3) away from the filter screen extends to the outside of the tube condenser (1) and is connected to a suction connection pipe (302) through a rotary joint (301). The suction connection pipe (302) is connected to a negative pressure device.

4. A condensation device for a recovery tower in the production of N-methylaniline according to claim 3, characterized in that: A slide rail (307) is installed on the inner wall of the suction and collection hood (304), a scraper (305) is slidably installed on the slide rail (307), and a spring (308) is installed inside the slide rail (307).

5. A condensation device for a recovery tower in the production of N-methylaniline according to claim 4, characterized in that: A helical guide rail (306) is installed on the outside of the rotating column (3), and a groove is provided on the side of the helical guide rail (306) away from the rotating column (3).

6. A condensation device for a recovery tower in the production of N-methylaniline according to claim 5, characterized in that: A push rod motor (4) is fixed to the outer wall of the tube condenser (1) by a bracket. A limit rod (401) is fixed to the output shaft of the push rod motor (4). One end of the limit rod (401) extends into the slide groove.

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