Mixed xylene refining and purifying device

Abstract

The utility model relates to the technical field of mixed xylene refining and purifying, in particular to a mixed xylene refining and purifying device. Comprising a shell, the upper end of the shell fixedly communicates with an inlet pipe, the lower end of the shell fixedly communicates with an outlet pipe, a temperature control assembly is arranged in the upper portion of the shell, and an interception assembly is arranged in the lower portion of the shell and communicates with a condenser. By monitoring the temperature of the heat-conducting medium in the oil outlet pipe in real time, the high-temperature gaseous water-containing mixed xylene can be effectively cooled.

Description

Technical Field

[0001] The utility model relates to the technical field of mixed xylene refining and purification, in particular to a mixed xylene refining and purification device. Background Art

[0002] Mixed xylene is a mixture of o-xylene, m-xylene, p-xylene and ethylbenzene, and the mixture is mainly used as a solvent for paints and coatings and an additive for aviation gasoline. Currently, in the preparation and purification process of mixed xylene, it is necessary to evaporate the water in the solution.

[0003] The patent document with application number CN201920028956.0 and titled "Mixed xylene refining and purification device" discloses a purification device that can separate water from mixed xylene. One end of the spiral heat exchange tube is connected to the water outlet of the industrial cooling tower through a water pipe, and the other end is connected to the water inlet of the industrial cooling tower through a return pipe via a water pump; tank body II is arranged at the lower end of tank body I, the upper end of the feed pipe is connected to the bottom of tank body I, and its lower end is connected to the upper end of tank body II, and the electric heating pipe is arranged in tank body II to heat the liquid in tank body II to 110℃-120℃; the exhaust pipe is connected to the top of the tank body. The produced mixed xylene gas is transported to the tank body I through the feed pipe 4. The cooling water after cooling by the industrial cooling tower is input into the spiral heat exchange tube through the water pipe. The spiral heat exchange tube cools the mixed xylene gas and water vapor in the tank body I to form liquid. The water that absorbs heat is transported to the industrial cooling tower through the return pipe under the action of the water pump to cool down again to achieve circulation. When a certain amount of liquid mixed xylene and water in the tank body I accumulates, the valve I is opened, and the liquid enters the tank body II through the feed pipe. Since the density of each component in the mixed xylene is lower than that of water, stratification occurs. The upper part of the liquid is mixed xylene liquid, and the lower part of the liquid is water. The electric heating tube is placed at the bottom of the tank body II, which is heated to 110℃-120℃. Since the boiling point of p-xylene in the mixed xylene is 138.37℃, the boiling point of o-xylene is 144.4℃, the boiling point of m-xylene is 139℃, and the boiling point of ethylbenzene is 136.2℃. Therefore, when the liquid is heated to 110℃-120℃, only water is heated to become gas, while the mixed xylene is not heated to become gas. The gas gradually gathers upward and is discharged through the exhaust pipe. The dehydrated mixed xylene solution achieves the effect of purification. After purification, the mixed xylene solution can be discharged through the discharge pipe by opening valve II. The purification device needs to first cool the gaseous water-containing mixed xylene into liquid, and then heat the liquid water-containing mixed xylene to 110℃-120℃. In the process of cooling and heating the water-containing mixed xylene, two cold sources are consumed, so the purification device has high energy consumption.

[0004] The patent document with application number CN201922431667.8 and titled "A Mixed Xylene Refining and Purification Device" discloses a purification device that can separate water from mixed xylene. The cooling water of the device is introduced through a first main pipe, enters the upper cavity of the cooling treatment box through a cold water pipe, and enters the outer cavity of the condenser through a second cold water pipe; hot water enters the second main pipe through a first hot water pipe and a second hot water pipe and flows out; a mixed gas is introduced through an air inlet pipe, and the mixed gas enters the condensation pipeline, and the first Cooling, after cooling, flows into the internal cavity of the condensation box for a second cooling; the gas during cooling is discharged through the exhaust pipe, the solenoid valve is opened to introduce the cooled liquid into the stirring distillation box through the connecting pipe, the motor is started to drive the stirring blades on the stirring shaft to rotate to stir the liquid, the electric heating wire heats the heat conducting plate to conduct heat, and it is heated to 110℃-120℃. Since the boiling point of p-xylene in the mixed xylene is 138.37℃, the boiling point of o-xylene is 144.4℃, the boiling point of m-xylene is 139℃, and the boiling point of ethylbenzene is 136.2℃. Therefore, when the liquid is heated to 110℃-120℃, only water is heated to become gas, while the mixed xylene will not be heated to become gas, and the gas gradually gathers upward and is discharged through the exhaust hole, and the dehydrated mixed xylene solution achieves the effect of purification; the utility model device can directly perform secondary condensation on the mixed xylene, and distillation treatment is performed after condensation to achieve the purification of the mixed xylene solution and improve the quality of xylene. The purification device needs to first cool the gaseous aqueous mixed xylene into liquid, and then heat the liquid aqueous mixed xylene to 110°C-120°C. The cooling source needs to be consumed twice in the process of cooling and heating the aqueous mixed xylene, so the purification device has high energy consumption. Utility Model Content

[0005] The technical problem to be solved by the utility model is a mixed xylene refining and purification device with low energy consumption.

[0006] In order to achieve the above purpose, the technical solution provided by the utility model is:

[0007] A mixed xylene refining and purification device comprises a shell, wherein the upper end of the shell is fixedly connected with an inlet pipe, the lower end of the shell is fixedly connected with an outlet pipe, a temperature control component is arranged in the upper part of the shell, a retention component is arranged in the lower part of the shell, and the retention component is connected with a condenser.

[0008] The temperature control component includes an upper plate and a lower plate fixed in the shell. The upper plate and the lower plate are hollow structures. The upper plate and the lower plate are connected by multiple sleeves. Heat exchange tubes are arranged in the sleeves. The heat exchange tubes pass through the upper plate and the lower plate. The heat exchange tubes are fixedly and sealedly connected to the upper plate and the lower plate. The upper plate is fixedly connected with an oil inlet pipe, and the lower plate is fixedly connected with an oil outlet pipe. A temperature sensor is installed on the oil outlet pipe. A sealing plate is rotatably connected in the shell on one side of the lower end of the heat exchange tube, and the sealing plate blocks the lower end of the heat exchange tube. A slide plate is arranged under the lower plate, and the slide plate is slidably connected to the heat exchange tube. The slide plate is connected to the lower plate through a cylinder, and the slide plate is hinged to the sealing plate through a pull rod. When the cylinder drives the slide plate upward, the slide plate can drive the sealing plate to rotate through the pull rod. After the sealing plate rotates, the sealing effect on the lower end of the heat exchange tube is lost. The temperature sensor, the controller and the solenoid valve controlling the cylinder are electrically connected.

[0009] Specifically, one end of the sealing plate is rotatably connected in the shell through a pin shaft, and a fixing plate is fixed to one end of the sealing plate close to the pin shaft. The fixing plate is hinged to one end of the pull rod, and the other end of the pull rod is hinged to the slide plate.

[0010] Specifically, a baffle is fixed in the shell above the upper plate, the upper end of the heat exchange tube is fixedly connected to the baffle, and the upper end of the heat exchange tube passes through the baffle.

[0011] Specifically, an electric heating pipe is fixed in the shell below the lower plate, and the electric heating pipe is a constant temperature electric heating pipe.

[0012] Specifically, the retention assembly includes a cover body, which is fixed on the inner wall of the shell, and a retention chamber is formed between the cover body and the shell. The lower end of the retention chamber is connected to the inside of the shell, and an air outlet pipe is fixed on the shell. The air outlet pipe connects the retention chamber and the condenser. A plurality of guide plates are fixed in the retention chamber below the air outlet pipe. The plurality of guide plates are evenly distributed in the vertical direction, and two adjacent guide plates are staggered and fixed in the retention chamber. The plurality of guide plates make the retention chamber below the air outlet pipe form an S-shaped retention channel, and a continuously bent filter is fixed between the two adjacent guide plates.

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

[0014] 1. The temperature sensor monitors the temperature of the heat transfer medium in the oil outlet pipe in real time. The normal working temperature range is preset in the controller as 110℃-125℃. When the temperature of the heat transfer medium in the oil outlet pipe is not within the normal working temperature range, the controller starts the solenoid valve of the control cylinder to make the cylinder drive the slide plate downward. After the slide plate moves downward, the sealing plate seals the lower end of the heat exchange tube to ensure that the heat transfer medium can control the temperature of the water-containing mixed xylene flowing through the heat exchange tube between 110℃-125℃. At this time, water vapor does not condense, and p-xylene, o-xylene, m-xylene and ethylbenzene are condensed into liquid and retained in the lower end of the shell. By real-time monitoring the temperature of the heat transfer medium in the oil outlet pipe, the high-temperature gaseous water-containing mixed xylene can be effectively cooled.

[0015] 2. By setting a baffle, the baffle can block the gaseous water-containing mixed xylene entering the shell, and can prevent the high-temperature gaseous water-containing mixed xylene from directly contacting the upper plate, causing a large change in the temperature of the heat-conducting medium in the upper plate and affecting the normal operation of the purification device. The heat-conducting medium can focus on effectively controlling the temperature of the gaseous water-containing mixed xylene flowing through the heat-conducting pipe.

[0016] 3. The heat exchange tube can divert the high-temperature gaseous water-containing mixed xylene, so that the heat transfer medium flowing between the sleeve and the heat exchange tube can effectively control the high-temperature gaseous water-containing mixed xylene in the heat exchange tube within the set temperature range.

[0017] 4. After the water vapor in the water-containing mixed xylene enters the shell below the lower plate, as the pressure in the shell continues to increase, the water vapor can be discharged through the interception channel and the exhaust pipe. Under the action of the guide plate and the filter, the paraxylene droplets, o-xylene droplets, m-xylene droplets and ethylbenzene droplets carried in the water vapor can gather on the filter and the guide plate to form droplets and be intercepted, which can reduce the consumption of mixed xylene.

[0018] 5. The electric heating tube in the lower part of the shell can ensure the temperature inside the shell and prevent water vapor from condensing in the shell.

[0019] 6. This device directly controls the temperature of the high-temperature gaseous water-containing mixed xylene without cooling it first and then heating it up, and has low energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of the device.

[0021] Figure 2 for Figure 1 Magnified view of area A.

[0022] Figure 3 Schematic diagram of the temperature control component.

[0023] Figure 4 A schematic diagram of the cover.

[0024] Figure 5 A top view of the cover.

[0025] Figure 6 for Figure 5 B-section view in the figure.

[0026] Figure 7 A top view of a continuously curved filter screen.

[0027] The names of the parts in the attached drawings are:

[0028] 1 Housing

[0029] 2 Baffle

[0030] 3 Upper plate

[0031] 4 Casing

[0032] 5 Lower plate

[0033] 6 Heat exchange tubes

[0034] 7 Oil inlet pipe

[0035] 8 Oil outlet pipe

[0036] 9 Temperature sensor

[0037] 10 Cylinders

[0038] 11. Skateboard

[0039] 12. Closing the board

[0040] 13 Fixing plate

[0041] 14 Tie rod

[0042] 15 Pin

[0043] 16 Electric heating tube

[0044] 17. Cover

[0045] 18 Exhaust pipe

[0046] 19 Condenser

[0047] 20 Deflector

[0048] 21 Filter

[0049] 22 Out of pipe

[0050] 23 Inlet pipe. DETAILED DESCRIPTION

[0051] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0052] Embodiment 1:

[0053] Reference Figure 1-Figure 7 As shown, a mixed xylene refining and purification device includes a shell 1, an upper end of the shell 1 is fixedly connected to an inlet pipe 23, a lower end of the shell 1 is fixedly connected to an outlet pipe 22, a temperature control component is arranged in the upper part of the shell 1, a retention component is arranged in the lower part of the shell 1, and the retention component is connected to the condenser 19.

[0054] The temperature control assembly includes an upper plate 3 and a lower plate 5 fixed in the housing 1. The upper plate 3 and the lower plate 5 are hollow structures. The upper plate 3 and the lower plate 5 are connected through a plurality of sleeves 4. A heat exchange tube 6 is arranged in the sleeve 4. The heat exchange tube 6 passes through the upper plate 3 and the lower plate 5. The heat exchange tube 6 is fixedly and sealedly connected to the upper plate 3 and the lower plate 5.

[0055] An annular cavity is formed between the heat exchange tube 6 and the outer casing 4 , and the heat exchange tube 6 is concentric with the outer casing 4 .

[0056] The high-temperature gaseous water-containing mixed xylene enters the shell 1 through the inlet pipe 23 and flows downward in the heat exchange tube 6 .

[0057] The upper plate 3 is fixedly connected with an oil inlet pipe 7. The lower plate 5 is fixedly connected with an oil outlet pipe 8. A temperature sensor 9 is installed on the oil outlet pipe 8.

[0058] A sealing plate 12 is rotatably connected in the shell 1 at one side of the lower end of the heat exchange tube 6. Specifically, one end of the sealing plate 12 is rotatably connected in the shell 1 through a pin shaft 15.

[0059] The sealing plate 12 blocks the lower end of the heat exchange tube 6. Specifically, a rubber pad is fixed to the upper end of the sealing plate 12, and the rubber pad is made of high temperature resistant rubber material.

[0060] A slide plate 11 is provided below the lower plate 5 , the slide plate 11 is slidably connected to the heat exchange tube 6 , and the slide plate 11 is connected to the lower plate 5 via a cylinder 10 .

[0061] The slide plate 11 is hingedly connected to the closing plate 12 via a pull rod 14. Specifically, a fixing plate 13 is fixed to one end of the closing plate 12 near the pin 15, and the fixing plate 13 is hingedly connected to one end of the pull rod 14, and the other end of the pull rod 14 is hingedly connected to the slide plate 11.

[0062] When the cylinder 10 drives the slide plate 11 upward, the slide plate 11 can drive the sealing plate 12 to rotate through the pull rod 14. After the sealing plate 12 rotates, the sealing effect on the lower end of the heat exchange tube 6 is lost.

[0063] The temperature sensor 9, the controller and the solenoid valve controlling the cylinder 10 are electrically connected.

[0064] The oil inlet pipe 7 and the oil outlet pipe 8 are connected to the thermal oil boiler. The thermal oil circulates in the oil inlet pipe 7, the upper plate 3, the annular cavity between the sleeve 4 and the heat exchange tube 6, the lower plate 5, the oil outlet pipe 8 and the thermal oil boiler. The temperature of the thermal oil entering the oil inlet pipe 7 from the thermal oil boiler is 110°C.

[0065] The temperature sensor 9 monitors the temperature of the heat transfer oil in the oil outlet pipe 8 in real time. The controller presets the temperature range of the normal operation of the device to be 110°C-125°C. When the temperature of the heat transfer oil in the oil outlet pipe 8 is not within the normal operating temperature range, the controller does not start the solenoid valve of the control cylinder 10, and the sealing plate 12 keeps the lower end of the heat exchange tube 6 blocked.

[0066] When the temperature of the heat transfer oil in the oil outlet pipe 8 rises to the normal working temperature range, the controller starts the solenoid valve of the control cylinder 10 so that the cylinder 10 drives the slide plate 11 upward. During the upward movement of the slide plate 11, the sealing plate 12 is driven to rotate through the pull rod 14 and the fixed plate 13. After the sealing plate 12 rotates, it loses its sealing effect on the lower end of the heat exchange tube 6.

[0067] When the temperature of the heat transfer oil in the oil outlet pipe 8 is not within the normal operating temperature range, the controller starts the solenoid valve of the control cylinder 10 so that the cylinder 10 drives the slide plate 11 downward. During the downward movement of the slide plate 11, the pull rod 14 and the fixed plate 13 drive the sealing plate 12 to rotate and seal the lower end of the heat exchange tube 6. Ensure that the heat transfer oil can control the temperature of the water-containing mixed xylene flowing through the heat exchange tube 6 between 110°C and 125°C. The water vapor in the water-containing mixed xylene between 110°C and 125°C does not condense, and the p-xylene, o-xylene, m-xylene and ethylbenzene are condensed into liquid and retained in the lower end of the shell 1. By real-time monitoring the temperature of the heat transfer oil in the oil outlet pipe 8, the temperature of the high-temperature gaseous water-containing mixed xylene can be effectively controlled.

[0068] The heat exchange tube 6 can divert the high-temperature gaseous aqueous mixed xylene, so that the heat transfer oil flowing between the sleeve 4 and the heat exchange tube 6 can effectively control the high-temperature gaseous aqueous mixed xylene in the heat exchange tube 6 within the set temperature range.

[0069] The retention assembly includes a cover body 17, which is fixed on the inner wall of the shell 1. A retention chamber is formed between the cover body 17 and the shell 1. The lower end of the retention chamber is connected to the inside of the shell 1. An air outlet pipe 18 is fixed on the shell 1, and the air outlet pipe 18 connects the retention chamber and the condenser 19.

[0070] A plurality of guide plates 20 are fixed in the retention cavity below the air outlet pipe 18. The plurality of guide plates 20 are evenly distributed in the vertical direction. Two adjacent guide plates 20 are staggered and fixed in the retention cavity. The plurality of guide plates 20 form an S-shaped retention channel in the retention cavity below the air outlet pipe 18. A continuously bent filter screen 21 is fixed between two adjacent guide plates 20.

[0071] After the water vapor in the water-containing mixed xylene enters the shell 1 below the lower plate 5, as the pressure in the shell 1 continues to increase, the water vapor can be discharged through the interception channel and the air outlet pipe 18. Under the action of the guide plate 20 and the continuously bent filter 21, the paraxylene droplets, orthoxylene droplets, metaxylene droplets and ethylbenzene droplets carried in the water vapor can be gathered on the filter 21 and the guide plate 20 to form droplets and be intercepted, which can reduce the consumption of the mixed xylene. The water vapor discharged through the air outlet pipe 18 can be condensed in the condenser 19.

[0072] By providing the continuously bent filter screen 21, the contact area between the water vapor and the filter screen 21 can be increased, and the interception effect of p-xylene droplets, o-xylene droplets, m-xylene droplets and ethylbenzene droplets can be improved.

[0073] Embodiment 2:

[0074] Based on Example 1, refer to Figure 1 and Figure 3 As shown, a baffle plate 2 is fixed in the shell 1 above the upper plate 3 , and the upper end of the heat exchange tube 6 is fixedly connected to the baffle plate 2 , and the upper end of the heat exchange tube 6 passes through the baffle plate 2 .

[0075] By setting the baffle 2, the baffle 2 can block the gaseous water-containing mixed xylene entering the shell 1, and can prevent a large amount of high-temperature gaseous water-containing mixed xylene from directly contacting the upper plate 3, which may cause a large change in the temperature of the heat transfer oil in the upper plate 3 and affect the normal operation of the purification device. The heat transfer oil can focus on and efficiently control the temperature of the gaseous water-containing mixed xylene flowing through the heat transfer pipe.

[0076] Embodiment three:

[0077] Based on Example 1, refer to Figure 1 and Figure 4 As shown, an electric heating pipe 16 is fixed in the shell 1 below the lower plate 5, and the electric heating pipe 16 is a constant temperature electric heating pipe 16.

[0078] In this embodiment, the constant temperature heating temperature of the electric heating pipe 16 is 115° C. The electric heating pipe 16 in the lower part of the shell 1 can ensure the temperature in the shell 1 and prevent the water vapor from condensing in the shell 1 and not being able to be completely discharged.

[0079] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A mixed xylene refining and purification device, comprising a shell (1), wherein the upper end of the shell (1) is fixedly connected to an inlet pipe (23), and the lower end of the shell (1) is fixedly connected to an outlet pipe (22), characterized in that: A temperature control component is arranged in the upper part of the shell (1), and a retention component is arranged in the lower part of the shell (1), and the retention component is connected to the condenser (19); the temperature control component comprises an upper plate (3) and a lower plate (5) fixed in the shell (1), the upper plate (3) and the lower plate (5) are hollow structures, the upper plate (3) and the lower plate (5) are connected through a plurality of sleeves (4), a heat exchange pipe (6) is arranged in the sleeve (4), the heat exchange pipe (6) passes through the upper plate (3) and the lower plate (5), the heat exchange pipe (6) is fixedly and sealedly connected to the upper plate (3) and the lower plate (5), the upper plate (3) is fixedly connected to an oil inlet pipe (7), the lower plate (5) is fixedly connected to an oil outlet pipe (8), and a temperature sensor (9) is installed on the oil outlet pipe (8). A sealing plate (12) is rotatably connected in the shell (1) on one side of the lower end of the heat exchange tube (6), and the sealing plate (12) seals the lower end of the heat exchange tube (6). A slide plate (11) is arranged below the lower plate (5), and the slide plate (11) is slidably connected to the heat exchange tube (6). The slide plate (11) and the lower plate (5) are connected via a cylinder (10). The slide plate (11) and the sealing plate (12) are hingedly connected via a pull rod (14). When the cylinder (10) drives the slide plate (11) upward, the slide plate (11) can drive the sealing plate (12) to rotate via the pull rod (14). After the sealing plate (12) rotates, it loses its sealing effect on the lower end of the heat exchange tube (6). The temperature sensor (9), the controller and the solenoid valve controlling the cylinder (10) are electrically connected.

2. A mixed xylene refining and purification device according to claim 1, characterized in that: One end of the sealing plate (12) is rotatably connected to the housing (1) via a pin shaft (15); a fixing plate (13) is fixed to one end of the sealing plate (12) close to the pin shaft (15); the fixing plate (13) is hingedly connected to one end of a pull rod (14); and the other end of the pull rod (14) is hingedly connected to the slide plate (11).

3. A mixed xylene refining and purification device according to claim 1, characterized in that: A baffle (2) is fixed inside the shell (1) above the upper plate (3), the upper end of the heat exchange tube (6) is fixedly connected to the baffle (2), and the upper end of the heat exchange tube (6) passes through the baffle (2).

4. A mixed xylene refining and purification device according to claim 1, characterized in that: An electric heating pipe (16) is fixed in the shell (1) below the lower plate (5), and the electric heating pipe (16) is a constant temperature electric heating pipe (16).

5. A mixed xylene refining and purification device according to claim 1, characterized in that: The interception assembly comprises a cover body (17), the cover body (17) is fixed on the inner wall of the shell (1), a interception cavity is formed between the cover body (17) and the shell (1), the lower end of the interception cavity is connected to the inside of the shell (1), an air outlet pipe (18) is fixed on the shell (1), the air outlet pipe (18) is connected to the interception cavity and the condenser (19), a plurality of guide plates (20) are fixed in the interception cavity below the air outlet pipe (18), the plurality of guide plates (20) are evenly distributed in the vertical direction, two adjacent guide plates (20) are staggered and fixed in the interception cavity, the plurality of guide plates (20) make the interception cavity below the air outlet pipe (18) form an S-shaped interception channel, and a continuously bent filter screen (21) is fixed between the two adjacent guide plates (20).

6. A mixed xylene refining and purification device according to claim 1, characterized in that: A rubber pad is fixed on the upper end of the sealing plate (12), and the rubber pad is made of high-temperature resistant rubber material.

7. A mixed xylene refining and purification device according to claim 1, characterized in that: An annular cavity is formed between the heat exchange tube (6) and the outer casing tube (4), and the heat exchange tube (6) and the outer casing tube (4) are concentric.

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