Toluene distillation recovery device in trichloropyridine preparation process

Abstract

The utility model discloses a toluene distillation recovery device in a trichloropyridine preparation process, which comprises a distillation kettle and a toluene tank, a liquid inlet of the distillation kettle is connected with a negative pressure pipeline, fixed support legs are mounted at four corners of the bottom of the distillation kettle, a heating sleeve is arranged on the outer side of the distillation kettle, a heating rod is arranged in the heating sleeve, and the toluene tank is connected with the distillation kettle. The negative pressure pipeline is sleeved with a heat preservation shell, a spiral heating pipe is arranged in the heat preservation shell, a fixed rack is installed on one side of the fixed supporting leg, a hot water pump is installed on the fixed rack, a hot water pumping pipe is installed at the water pumping end of the hot water pump, and a hot water supply pipe is installed at the water outlet end of the hot water pump. The top end of the spiral heating pipe is connected with a water return pipe, and the end, away from the spiral heating pipe, of the water return pipe communicates with the heating sleeve. The toluene distillation kettle has the beneficial effects that the heating efficiency is improved, materials can be heated during conveying, the temperature of the materials is increased, the distillation time of the materials in the distillation kettle is shortened, and the toluene distillation efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of toluene distillation, in particular to a toluene distillation recovery device in a trichloropyridine preparation process. Background Art

[0002] Toluene is an organic compound with the chemical formula C7H8. It is a colorless, volatile liquid with a special aromatic smell. It has strong refractive index. It is miscible with ethanol, ether, acetone, chloroform, carbon disulfide and glacial acetic acid, and is very slightly soluble in water. It is flammable, and its vapor can form an explosive mixture with air. The mixture can explode when the volume concentration is within a low range. Toluene is a commonly used solvent and needs to be purified and recovered by distillation after use.

[0003] In the existing technology, distillation recovery is carried out through a distillation kettle. The temperature of the material is low before entering the distillation kettle, and the temperature inside the distillation kettle will be lowered after entering the distillation kettle. The distillation kettle needs to heat the material to the boiling point. The distillation efficiency of the existing distillation kettle is reduced, the distillation time is increased, the distillation effect is affected, and the toluene distillation efficiency is reduced.

[0004] It should be noted that the above content falls within the technical knowledge of the inventor and does not necessarily constitute prior art. Utility Model Content

[0005] The purpose of the utility model is to solve the above problems and designs a toluene distillation and recovery device in the trichloropyridine preparation process.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A toluene distillation and recovery device in a trichloropyridine preparation process comprises a still and a toluene tank, wherein a liquid inlet of the still is connected to a negative pressure pipeline, fixed legs are installed at the four corners of the bottom of the still, a heating jacket is provided on the outside of the still, a heating rod is provided in the heating jacket, a heat-insulating shell is sleeved on the negative pressure pipeline, a spiral heating pipe is provided in the heat-insulating shell, and the spiral heating pipe is spirally wound around the negative pressure pipeline, a fixed frame is installed on one side of the fixed leg, a hot water pump is installed on the fixed frame, a hot water pumping pipe is installed at the water pumping end of the hot water pump, one end of the hot water pumping pipe is connected to the heating jacket, a hot water supply pipe is installed at the water outlet of the hot water pump, one end of the hot water supply pipe is connected to the bottom end of the spiral heating pipe, a top end of the spiral heating pipe is connected to a return pipe, and an end of the return pipe away from the spiral heating pipe is connected to the heating jacket.

[0008] Furthermore, an air supply pipe is installed on one side of the heating sleeve, and the air supply pipe is connected to the insulation shell at one end away from the heating sleeve. An exhaust pipe is connected to the top side of the insulation shell, and an exhaust valve is installed on the top of the exhaust pipe.

[0009] Furthermore, a toluene collecting pipe is connected between the distillation kettle and the toluene tank, a condenser is provided on the toluene collecting pipe, and a pure toluene pipe is provided on one side of the toluene tank.

[0010] Furthermore, a water inlet is provided on one side of the top of the heating jacket, a sealing plug is connected to the water inlet, a visual window is provided on the front of the heating jacket, and a liquid level mark is provided on the visual window.

[0011] Furthermore, a plurality of heating rods are provided and are evenly distributed in a ring shape in the heating sleeve.

[0012] Furthermore, the air supply pipe, spiral heating pipe, hot water extraction pipe, hot water supply pipe and return pipe are all made of high temperature and high pressure resistant pipes, and the air supply pipe is Z-shaped.

[0013] Compared with the existing technology, this technical solution has the following beneficial effects:

[0014] The heating jacket is used to assist in heating the still kettle, thereby improving the heating efficiency. The spiral heating tube is used to heat the negative pressure pipeline, so that the material can be heated while being transported in the negative pressure pipeline, thereby increasing the temperature of the material, reducing the distillation time of the material in the still kettle, and improving the toluene distillation efficiency. Hot water is continuously transported into the spiral heating tube, and the hot water can flow back into the heating jacket through the return pipe. The hot water can be recycled, thus saving water resources.

[0015] The steam generated by hot water can be transported to the insulation shell through the air supply pipe. The steam can heat the spiral heating tube in the insulation shell, thereby improving the heating efficiency of the spiral heating tube and increasing the temperature of the material. The gas in the insulation shell is discharged through the exhaust valve and the exhaust pipe to avoid bulging and damage of the insulation shell and increase its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The present invention provides a schematic structural diagram of a toluene distillation and recovery device in a trichloropyridine preparation process.

[0017] Figure 2 It is a cross-sectional schematic diagram of the heating jacket and the insulation shell.

[0018] Figure 3 This is an enlarged cross-sectional view of the insulation shell.

[0019] Figure 4 An enlarged cross-sectional view of the heating jacket.

[0020] In the figure: 1. Distillation kettle; 2. Toluene tank; 3. Negative pressure pipeline; 4. Fixed support leg; 5. Heating jacket; 6. Heating rod; 7. Insulation shell; 8. Spiral heating tube; 9. Fixed frame; 10. Hot water pump; 11. Hot water extraction pipe; 12. Hot water supply pipe; 13. Return pipe; 14. Air supply pipe; 15. Exhaust pipe; 16. Exhaust valve; 17. Toluene collection pipe; 18. Condenser; 19. Pure toluene tube; 20. Water inlet; 21. Sealing plug; 22. Visual window; 23. Liquid level mark. DETAILED DESCRIPTION

[0021] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0022] In the description of the present invention, it should be understood that the terms "length," "width," "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inside," "outside," and the like, indicating positions or location relationships, are based on the positions or location relationships shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, in the description of the present invention, "plurality" means two or more, unless otherwise expressly and specifically defined.

[0023] The utility model provides Figure 1-4 The toluene distillation and recovery device in the trichloropyridine preparation process shown includes a distillation kettle 1 and a toluene tank 2. The liquid inlet of the distillation kettle 1 is connected to a negative pressure pipeline 3. Fixed legs 4 are installed at the four corners of the bottom of the distillation kettle 1. A heating jacket 5 is provided on the outside of the distillation kettle 1. A heating rod 6 is provided in the heating jacket 5. An insulation shell 7 is provided on the negative pressure pipeline 3. A spiral heating pipe 8 is provided in the insulation shell 7. The spiral heating pipe 8 is spirally wound on the negative pressure pipeline 3. A fixed frame 9 is installed on one side of the fixed leg 4. A hot water pump 10 is installed on the fixed frame 9. A hot water pumping pipe 11 is installed at the water pumping end of the hot water pump 10. One end of the hot water pumping pipe 11 is connected to the heating jacket 5. A hot water supply pipe 12 is installed at the water outlet end of the hot water pump 10. One end of the hot water supply pipe 12 is connected to the bottom end of the spiral heating pipe 8. The top of the spiral heating pipe 8 is connected to a return pipe 13. The return pipe 13 is connected to the heating jacket 5 at one end away from the spiral heating pipe 8.

[0024] The extracted material is pumped into the distillation kettle 1 under the action of negative pressure through the negative pressure pipeline 3, heated to about 120°C with steam, to evaporate toluene, and evaporate the water. This is the existing technology, so it will not be described in detail. The distillation kettle 1 is auxiliary heated by the heating jacket 5, and water is added to the heating jacket 5. The heating rod 6 starts working to heat the water in the heating jacket 5. The hot water assists in heating the distillation kettle 1, thereby improving the heating efficiency. When the material is transported into the distillation kettle 1, the hot water pump 10 starts working and extracts the hot water in the heating jacket 5 through the hot water extraction pipe 11, and then transports it to the spiral heating pipe 8 through the hot water supply pipe 12. The negative pressure pipeline 3 is heated by the spiral heating pipe 8. The material can be heated while being transported in the negative pressure pipeline 3, thereby increasing the temperature of the material, reducing the distillation time of the material in the distillation kettle 1, and improving the toluene distillation efficiency. Hot water is continuously transported into the spiral heating pipe 8 and can flow back into the heating jacket 5 through the return pipe 13. The hot water can be recycled, saving water resources.

[0025] Refer to the instruction manual Figure 2 , Instruction Manual Figure 3 and instructions attached Figure 4 An air supply pipe 14 is installed on one side of the heating sleeve 5. The end of the air supply pipe 14 away from the heating sleeve 5 is connected to the insulation shell 7. An exhaust pipe 15 is connected to the top side of the insulation shell 7. An exhaust valve 16 is installed on the top of the exhaust pipe 15.

[0026] The steam generated by the hot water in the heating sleeve 5 is transported to the insulation shell 7 through the air supply pipe 14. The steam can heat the spiral heating tube 8 in the insulation shell 7, thereby improving the heating efficiency of the spiral heating tube 8 and increasing the temperature of the material. When the pressure in the insulation shell 7 is too high, the exhaust valve 16 opens and the gas in the insulation shell 7 is discharged through the exhaust pipe 15, thereby avoiding bulging and damage of the insulation shell 7 and increasing its service life.

[0027] Refer to the instruction manual Figure 1 and instructions attached Figure 2 A toluene collecting pipe 17 is connected between the distillation kettle 1 and the toluene tank 2. A condenser 18 is provided on the toluene collecting pipe 17. A pure toluene pipe 19 is provided on one side of the toluene tank 2.

[0028] Toluene gas enters the condenser 18 through the toluene collecting pipe 17. The gas is cooled into liquid by the condenser 18 and enters the toluene tank 2, which is convenient for collecting toluene and then extracting and utilizing it again, thus reducing production costs. The toluene is conveniently discharged through the pure toluene pipe 19.

[0029] Refer to the instruction manual Figure 1 and instructions attached Figure 4 A water inlet 20 is provided on one side of the top of the heating jacket 5 , and a sealing plug 21 is connected to the water inlet 20 . A visual window 22 is provided on the front of the heating jacket 5 , and a liquid level mark 23 is provided on the visual window 22 .

[0030] The liquid level in the heating jacket 5 can be easily checked through the liquid level mark 23 on the visual window 22. When water needs to be added, the sealing plug 21 is removed from the water injection port 20 and water is added to the heating jacket 5 through the water injection port 20. The operation is simple and convenient.

[0031] Refer to the instruction manual Figure 2 , Instruction Manual Figure 3 and instructions attached Figure 4 The air supply pipe 14, the spiral heating pipe 8, the hot water pumping pipe 11, the hot water supply pipe 12 and the return pipe 13 are all made of high temperature and high pressure pipes, and the air supply pipe 14 is Z-shaped.

[0032] The air supply pipe 14 is Z-shaped to prevent hot water from flowing into the insulation shell 7 through the air supply pipe 14. The use of high-temperature and high-pressure resistant pipes increases strength and service life.

[0033] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A toluene distillation and recovery device in a trichloropyridine preparation process, comprising a distillation kettle (1) and a toluene tank (2), wherein the liquid inlet of the distillation kettle (1) is connected to a negative pressure pipeline (3), and fixed legs (4) are installed at the four corners of the bottom of the distillation kettle (1), characterized in that: A heating jacket (5) is provided on the outside of the distillation kettle (1), a heating rod (6) is provided in the heating jacket (5), an insulation shell (7) is provided on the negative pressure pipeline (3), a spiral heating tube (8) is provided in the insulation shell (7), and the spiral heating tube (8) is spirally wound on the negative pressure pipeline (3). A fixed frame (9) is installed on one side of the fixed leg (4), and a hot water pump (10) is installed on the fixed frame (9). A hot water pump (11) is installed at the water pumping end of the hot water pump (10), and one end of the hot water pump (11) is connected to the heating jacket (5). A hot water supply pipe (12) is installed at the water outlet end of the hot water pump (10), and one end of the hot water supply pipe (12) is connected to the bottom end of the spiral heating tube (8). The top end of the spiral heating tube (8) is connected to a return pipe (13), and the return pipe (13) is connected to the heating jacket (5) at one end away from the spiral heating tube (8).

2. A toluene distillation recovery device in a trichloropyridine preparation process according to claim 1, characterized in that: An air supply pipe (14) is installed on one side of the heating jacket (5), and the air supply pipe (14) is connected to the insulation shell (7) at one end away from the heating jacket (5). An exhaust pipe (15) is connected to the top side of the insulation shell (7), and an exhaust valve (16) is installed at the top of the exhaust pipe (15).

3. A toluene distillation recovery device in a trichloropyridine preparation process according to claim 1, characterized in that: A toluene collecting pipe (17) is connected between the distillation kettle (1) and the toluene tank (2), a condenser (18) is provided on the toluene collecting pipe (17), and a pure toluene pipe (19) is provided on one side of the toluene tank (2).

4. A toluene distillation recovery device in a trichloropyridine preparation process according to claim 1, characterized in that: A water inlet (20) is provided on one side of the top of the heating sleeve (5), and a sealing plug (21) is connected to the water inlet (20). A visual window (22) is provided on the front of the heating sleeve (5), and a liquid level mark (23) is provided on the visual window (22).

5. A toluene distillation recovery device in a trichloropyridine preparation process according to claim 1, characterized in that: A plurality of heating rods (6) are provided and are evenly distributed in a ring shape within the heating sleeve (5).

6. A toluene distillation recovery device in a trichloropyridine preparation process according to claim 2, characterized in that: The air supply pipe (14), spiral heating pipe (8), hot water pumping pipe (11), hot water supply pipe (12) and return pipe (13) are all made of high-temperature and high-pressure resistant pipes, and the air supply pipe (14) is Z-shaped.

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