Toluene recovery device

Abstract

The utility model relates to the field of toluene recovery, and provides a toluene recovery device which comprises a condenser, a vacuum balance tank mounted on a pipeline at one end of the condenser, a liquid discharge pipe mounted at the bottom of the vacuum balance tank, a rectifying tower mounted on a pipeline at one end of the condenser, and a return pipe connected with a pipeline at the upper part of the rectifying tower, the branch end of the backflow pipe is connected with a backflow water distribution tank and a methylbenzene receiving tank, an adjusting valve, a pressure gauge, a flow meter and a buffer pipe are sequentially installed between the rectifying tower and the backflow water distribution tank, the buffer pipe, the flow meter, the pressure gauge and the adjusting valve are sequentially installed between the liquid discharging pipe and the methylbenzene receiving tank, and an interface meter is installed on the top of the backflow water distribution tank. According to the utility model, the interface meter is arranged at the top of the backflow water separation tank, and the interface meter can be interlocked with the water separation switch valve through the density difference of a floater, so that the effective separation of methylbenzene and water phase is realized; and the screen plate in the buffer tube can refine the liquid, so that the flowmeter is prevented from being impacted by high flow.

Description

Technical Field

[0001] The utility model belongs to the field of toluene recovery and relates to a toluene water removal and recovery device. Background Technique

[0002] As a chemical raw material, toluene has wide applications, and the recovery of water-containing toluene is also important.

[0003] At present, the basic reflux water separation is generally manually operated. Usually, the density difference between materials is used, and two-phase separation is carried out by the overflow method, which easily leads to incomplete water separation. Considering this problem, an interface meter is selected to replace the traditional naked-eye observation and manual operation method. The interface meter can be interlocked with the water separation switch valve through the density difference of the float to achieve effective separation between toluene and the water phase. At the same time, during the toluene recovery process, too fast flow rate will impact the flowmeter and even damage the flowmeter. Content of the Utility Model

[0004] The purpose of the utility model is to provide a toluene recovery device, which solves the problems that the basic reflux water separation is generally manually operated at present. Usually, the density difference between materials is used, and two-phase separation is carried out by the overflow method, which easily leads to incomplete water separation. Considering this problem, an interface meter is selected to replace the traditional naked-eye observation and manual operation method. The interface meter can be interlocked with the water separation switch valve through the density difference of the float to achieve effective separation between toluene and the water phase. At the same time, during the toluene recovery process, too fast flow rate will impact the flowmeter and even damage the flowmeter.

[0005] The technical solution of the utility model is realized as follows: It includes a condenser. One end of the condenser pipeline is installed with a vacuum balance tank. The bottom of the vacuum balance tank is installed with a downcomer. The downcomer is made of stainless steel material and is coated with paint on the outside. One end of the condenser pipeline is installed with a rectification column. The upper pipeline of the rectification column is connected with a reflux pipe. The branched end of the reflux pipe is connected with a reflux water separation tank and a toluene receiving tank. A regulating valve, a pressure gauge, a flowmeter and a buffer pipe are sequentially installed between the rectification column and the reflux water separation tank. A buffer pipe, a flowmeter, a pressure gauge and a regulating valve are sequentially installed between the downcomer and the toluene receiving tank. An interface meter is installed on the top of the reflux water separation tank. A probe is installed at the inner end of the interface meter. A net plate is fixedly installed inside the buffer pipe, and a plurality of round holes are arranged on the net plate.

[0006] As a preferred scheme of the utility model, the rectification column pipeline is connected with a rectification kettle. The shell of the rectification kettle is made of stainless steel material and is coated with paint on the outside.

[0007] As a preferred scheme of the utility model, the upper and lower parts of the condenser are respectively installed with a water inlet and a water outlet. The water inlet and the water outlet are respectively connected to a cooling water pool and a water pump through water pipes.

[0008] As a preferred embodiment of the present utility model, a first vacuum tube is provided at the upper part of the other end of the vacuum balance tank, and a valve is provided in the middle of the first vacuum tube.

[0009] As a preferred embodiment of the present utility model, an orifice plate is fixedly installed at the upper part inside the rectifying column, and the orifice plate is fixedly installed at the upper part inside the rectifying column by means of bolt connection.

[0010] As a preferred embodiment of the present utility model, a second vacuum tube is fixedly installed at the other end of the top of the toluene receiving tank, and a valve is provided in the middle of the second vacuum tube.

[0011] As a preferred embodiment of the present utility model, the reflux water separation tank is connected to the main water receiving tank through a pipeline. A third vacuum tube is fixedly installed at one end of the main water receiving tank. The other end of the reflux water separation tank is connected to the interface meter and interlocked with the water separation switch valve. A valve is provided in the middle of the third vacuum tube.

[0012] As a preferred embodiment of the present utility model, a fixing ring is provided inside the buffer tube. A mesh plate is fixedly installed on the fixing ring by bolts, and the fixing ring is fixedly installed inside the buffer tube by welding.

[0013] The beneficial effects of a toluene recovery device of the present utility model: An interface meter is installed at the top of the reflux water separation tank of the present utility model. The interface meter can be interlocked with the water separation switch valve through the density difference of the floats to effectively separate the toluene and the water phase, improve the separation speed and efficiency; a buffer tube is provided at the front end of the flow meter, and the mesh plate inside the buffer tube can refine the liquid to avoid large-pressure impact on the flow meter. Description of the Drawings

[0014] Figure 1 It is the overall structure diagram of the embodiment of the present utility model;

[0015] Figure 2 It is the condenser structure diagram of the embodiment of the present utility model;

[0016] Figure 3 It is the buffer tube structure diagram of the embodiment of the present utility model;

[0017] Figure 4 It is the reflux water separation tank structure diagram of the embodiment of the present utility model;

[0018] Figure 5 It is the rectifying column structure diagram of the embodiment of the present utility model;

[0019] In the figure: 1. Condenser; 2. Rectifying column; 3. Rectifying kettle; 4. Vacuum balance tank; 5. Control valve; 6. Buffer pipe; 7. Flowmeter; 8. Pressure gauge; 9. Toluene receiving tank; 10. Reflux water separation tank; 11. Main water receiving tank; 12. Water inlet; 13. Water outlet; 14. Fixed ring; 15. Mesh plate; 16. Bolt; 17. Vacuum pipe three; 18. Vacuum pipe two; 19. Vacuum pipe one; 20. Interface meter; 21. Probe; 22. Orifice plate; 23. Water separation switch valve. Specific embodiments

[0020] As Figures 1 to 5 shown, the utility model discloses a toluene recovery device. The adopted technical solution is as follows: it includes a condenser 1. One end of the pipeline of the condenser 1 is installed with a vacuum balance tank 4. A liquid discharge pipe is installed at the bottom of the vacuum balance tank 4. One end of the pipeline of the condenser 1 is installed with a rectifying column 2. The upper pipeline of the rectifying column 2 is connected with a reflux pipe. The branched end of the reflux pipe is connected with a reflux water separation tank 10 and a toluene receiving tank 9. A control valve 5, a pressure gauge 8, a flowmeter 7 and a buffer pipe 6 are successively installed between the rectifying column 2 and the reflux water separation tank 10. A buffer pipe 6, a flowmeter 7, a pressure gauge 8 and a control valve 5 are successively installed between the liquid discharge pipe and the toluene receiving tank 9. An interface meter 20 is installed at the top of the reflux water separation tank 10. A probe 21 is installed at the inner end of the interface meter 20. A mesh plate 15 is fixedly installed inside the buffer pipe 6. In the utility model, an interface meter 20 is installed at the top of the flow water separation receiving tank 10. The interface meter can be interlocked with the water separation switch valve 23 through the density difference of the float to effectively separate the toluene and the water phase, improve the separation speed and efficiency; a buffer pipe 6 is arranged at the front end of the flowmeter 7. The mesh plate 15 inside the buffer pipe 6 can refine the liquid to avoid the flowmeter 7 being impacted by too large a flow rate; the pressure gauge 8 can effectively monitor the pressure of the device to ensure the safety of the distillation process.

[0021] The rectifying column 2 is connected to a rectifying kettle 3 through a pipeline. The rectifying kettle 3 is used for heating the mixed liquid so that water and toluene can be heated and vaporized.

[0022] An inlet 12 and an outlet 13 are respectively installed on the upper and lower parts of the condenser 1. The inlet 12 and the outlet 13 are respectively used for the entry and exit of cooling water.

[0023] On the upper part of the other end of the vacuum balance tank 4, a vacuum pipe one 19 is provided. The vacuum pipe one 19 is used for vacuum treatment inside the vacuum balance tank 4.

[0024] An orifice plate 22 is fixedly installed on the upper inner side of the rectifying column 2. The orifice plate 22 is used for the uniform distribution or redistribution of the liquid inside the rectifying column 2, to increase the effective surface for mass transfer and heat transfer, improve the interfacial contact, and thus improve the efficiency of the column.

[0025] At the other end of the top of the toluene receiving tank 9, a second vacuum tube 18 is fixedly installed. The toluene receiving tank 9 is used to receive toluene, and the second vacuum tube 18 is used for vacuum treatment inside the toluene receiving tank 9.

[0026] The reflux and water separation tank 10 is connected to the main water receiving tank 11 through a pipeline. At one end of the main water receiving tank 11, a third vacuum tube 17 is fixedly installed. The third vacuum tube 17 is used for vacuum treatment of the reflux and water separation tank 10. The other end of the reflux and water separation tank 10 is connected to the interface meter 20 and interlocked with the water separation switch valve 23. The interface meter 20 is used to monitor the liquid level.

[0027] A fixing ring 14 is arranged inside the buffer tube 6. The fixing ring 14 is fixedly installed with a mesh plate 15 through bolts 16. The fixing ring 14 is used to fix the mesh plate 15, so that the mesh plate 15 is installed inside the buffer tube 6.

[0028] The working principle of this toluene recovery device: When a toluene recovery device is in use, the distillation kettle 3 heats the mixed liquid, the distillation column 2 distills the mixed liquid, the condenser 1 cools the distilled gas, the coolant enters the vacuum balance tank 4, then enters the lower liquid pipe, and then the mixed liquid enters the reflux and water separation tank 10. When a certain liquid level is reached, the water separation switch valve between the interface meter and the water receiving tank will automatically open, and the water in the water separation tank will be automatically discharged into the water receiving tank. When the low level of the interface meter is reached, the switch valve will be automatically closed; the upper-layer toluene will flow back to the distillation column through the reflux pipe and continue to reflux and carry water. After all the water is separated, the valves on the reflux pipe and the main water receiving tank 11 will be closed, and the anhydrous toluene will be distilled into the toluene receiving tank 9. The above device realizes the effect of automatic stratification. It reduces manual labor and improves work efficiency.

[0029] Although the specific embodiments of the present invention are described in detail above, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art, various changes can be made without departing from the purpose of the present invention, and the modifications or deformations without creative labor are still within the protection scope of the present invention.

Claims

1. A toluene recovery device, characterized in that: It includes a condenser (1), one end of the condenser (1) is installed with a vacuum balance tank (4) through a pipeline, a downcomer is installed at the bottom of the vacuum balance tank (4), one end of the condenser (1) is installed with a distillation column (2) through a pipeline, the upper part of the distillation column (2) is connected with a reflux pipe through a pipeline, and the branched end of the reflux pipe is connected with a reflux water separation tank (10) and a toluene receiving tank (9). A regulating valve (5), a pressure gauge (8), a flowmeter (7) and a buffer pipe (6) are sequentially installed between the distillation column (2) and the reflux water separation tank (10). A buffer pipe (6), a flowmeter (7), a pressure gauge (8) and a regulating valve (5) are sequentially installed between the downcomer and the toluene receiving tank (9). An interface meter (20) is installed at the top of the reflux water separation tank (10), a probe (21) is installed at the inner end of the interface meter (20), and a mesh plate (15) is fixedly installed inside the buffer pipe (6).

2. The toluene recovery device according to claim 1, wherein: The distillation column (2) is connected with a distillation kettle (3) through a pipeline.

3. The toluene recovery device according to claim 1, characterized in that: Water inlets (12) and water outlets (13) are respectively installed at the upper and lower parts of the condenser (1).

4. The toluene recovery device according to claim 1, characterized in that: A vacuum pipe one (19) is arranged at the upper part of the other end of the vacuum balance tank (4).

5. A toluene recovery device according to claim 1, characterized in that: An orifice plate (22) is fixedly installed at the upper part inside the distillation column (2).

6. The toluene recovery device according to claim 1, characterized in that: A vacuum pipe two (18) is fixedly installed at the other end of the top of the toluene receiving tank (9).

7. The toluene recovery device according to claim 1, characterized in that: The reflux water separation tank (10) is connected with a main water receiving tank (11) through a pipeline. A vacuum pipe three (17) is fixedly installed at one end of the main water receiving tank (11). The other end of the reflux water separation tank (10) is connected to the interface meter (20) and is interlocked with a water separation switch valve (23).

8. The toluene recovery device according to claim 1, characterized in that: A fixing ring (14) is arranged inside the buffer pipe (6), and the mesh plate (15) is fixedly installed on the fixing ring (14) through bolts (16).

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