Double-tower type continuous rectification device

Abstract

The utility model relates to the technical field of rectification, and provides a double-tower type continuous rectification device which comprises a first rectification tower, a feeding pipe fixedly penetrates through the top of the first rectification tower, and a first fixing ring is fixedly connected to the circumferential surface of the first rectification tower. By means of the technical scheme, the problems that in the prior art, an electric telescopic rod is driven to be matched with a heating sleeve, a hot water tank, a water conveying pipe, a thrust plate, a piston rod, a piston plate and other assemblies in a heating device, and when the electric telescopic rod stretches out downwards, the thrust plate is driven to move downwards; the piston plate moves downwards to extrude water in the hot water tank, so that a necessary liquid phase is provided for mass transfer and heat transfer processes on the tower plate, the separation effect is favorably improved, and the stable operation of the rectification process is ensured. Similarly, part of tower bottom products can be pumped back into the tower through a pump to serve as tower bottom backflow, so that the temperature and composition of the tower bottom are adjusted, and the separation efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of distillation technology, specifically to a dual-tower continuous distillation apparatus. Background Technology

[0002] Twin-tower distillation refers to dividing the distillation process into two independent columns, typically including a pre-column and a main column. The pre-column is mainly used to remove low-boiling-point impurities and provide preheated feed to the main column; the main column is used to remove high-boiling-point impurities, ultimately obtaining a high-purity product.

[0003] According to a public disclosure (CN 218474894 U), a dual-tower continuous distillation apparatus for diethylene glycol methyl ethyl ether includes a feed inlet, a feed regulating valve connected to the feed inlet, a heating structure I for heating the material, and a receiving structure I for storing the material. The feed regulating valve is connected to the heating structure I via pipeline I, the heating structure I is connected to the receiving structure I via pipeline IV, the receiving structure I is connected to the heating structure II for heating the material via pipeline VI, and the heating structure II is connected to the receiving structure II for receiving the material via pipeline VIII. The heating structure I includes a primary distillation column and a reboiler I connected via a steam regulating valve. The primary distillation column is connected to a liquid pump via pipeline II, and the liquid pump is connected to the reboiler I via pipeline III. The dual-tower continuous distillation apparatus for diethylene glycol methyl ethyl ether provided by this utility model ensures continuous operation of distillation, improves working efficiency, reduces energy consumption, and is suitable for large-scale applications.

[0004] However, in the above application, the cooperation of components such as the receiving structure, feed regulating valve, pipeline one, and heating structure one makes it difficult to use hot water to circulate and heat the materials in the first and second distillation columns, resulting in uneven heating of the materials, reducing the distillation effect and efficiency, and decreasing the utilization rate of the materials, which needs to be improved. Utility Model Content

[0005] This invention proposes a dual-tower continuous distillation apparatus, which solves the problems mentioned in the above-mentioned documents.

[0006] The technical solution of this utility model is as follows: it includes a first distillation column, a feed pipe fixedly penetrating the top of the first distillation column, a first fixing ring fixedly connected to the circumferential surface of the first distillation column, a first support leg fixedly connected to the bottom of the first fixing ring, a connecting pipe fixedly penetrating the circumferential surface of the first distillation column, a second distillation column fixedly penetrating one end of the connecting pipe, and the other end of the connecting pipe fixedly penetrating the circumferential surface of the first distillation column, a discharge pipe fixedly penetrating the bottom of the second distillation column, a second fixing ring fixedly connected to the circumferential surface of the second distillation column, a second support leg fixedly connected to the bottom of the second fixing ring, and a heating device provided on the circumferential surface of the first distillation column;

[0007] The heating device includes a heating jacket, the inner side of which is fixedly connected to the circumferential surface of the first distillation column. A large support plate is fixedly connected to the circumferential surface of the first fixing ring. A hot water tank is fixedly connected to the top of the large support plate. A water supply pipe is fixedly passed through the side of the hot water tank, and one end of the water supply pipe is fixedly passed through the circumferential surface of the heating jacket.

[0008] A small support plate is fixedly connected to the circumference of the first distillation column. An electric telescopic rod is fixedly connected to the bottom of the small support plate. A thrust plate is fixedly connected to the telescopic end of the electric telescopic rod. The small support plate is for supporting the electric telescopic rod, the electric telescopic rod is for moving the thrust plate, and the thrust plate is for pushing the piston rod.

[0009] A piston rod is fixedly connected to the bottom of the thrust plate. The bottom of the piston rod passes through the inside of the hot water tank, and the circumferential surface of the piston rod is slidably connected to the inside of the hot water tank. The piston rod is used to move the piston plate.

[0010] A piston plate is fixedly connected to the bottom of the piston rod, and a placement plate is fixedly connected to the circumferential surface of the first fixed ring. The piston plate is used to squeeze the water in the hot water tank, and the placement plate is used to place the circulating water tank.

[0011] A circulating water tank is fixedly connected to the top of the placement plate, and an inlet pipe is fixedly inserted through the top of the circulating water tank. The circulating water tank is for the purpose of recycling water and saving water resources, and the inlet pipe is for the purpose of allowing water to enter the circulating water tank.

[0012] A conveying pipe is fixedly inserted through the side of the circulating water tank. One end of the conveying pipe is fixedly inserted through the circumference of the heating jacket. The conveying pipe is used to transport water into the circulating water tank.

[0013] An L-shaped water pipe is fixedly inserted through the side of the circulating water tank. One end of the L-shaped water pipe is fixedly inserted through the side of the hot water tank. The L-shaped water pipe is used to input water into the hot water tank.

[0014] A first control valve is provided on the circumference of the conveying pipe, and a second control valve is provided on the circumference of the L-shaped water conveying pipe. The first and second control valves are for controlling the water.

[0015] A control panel is provided on the side of the circulating water tank, and an air-heat exchanger is provided on the side of the circulating water tank. The control panel is used to control the air-heat exchanger, which is used to heat the water in the circulating water tank.

[0016] The first support leg is provided in two sets, and is symmetrical to each other along the vertical central axis of the first fixing ring. The second support leg is provided in two sets, and is symmetrical to each other along the vertical central axis of the second fixing ring. The heating device is provided in two sets, and is symmetrical to each other along the vertical central axis of the connecting pipe. The first support leg is provided in two sets to make the first distillation column more stable. The second support leg is provided in two sets to make the second distillation column more stable. The heating device is provided in two sets so that both the first and second distillation columns can be heated.

[0017] The working principle and beneficial effects of this utility model are as follows:

[0018] 1. In this utility model, the electric telescopic rod, in conjunction with components such as the heating jacket, hot water tank, water supply pipe, thrust plate, piston rod, and piston plate inside the heating device, enables the electric telescopic rod to extend downwards, driving the thrust plate downwards. The downward movement of the thrust plate, in turn, drives the piston rod and piston plate downwards. This downward movement of the piston plate compresses the water in the hot water tank, forcing it through the water supply pipe into the heating jacket, thus achieving a heating effect. During its descent, the reflux liquid makes full contact with the rising gas phase, providing an opportunity for the condensation of heavy components in the gas phase. It also provides the necessary liquid phase for mass and heat transfer processes on the trays, helping to improve separation efficiency and ensure the stable operation of the distillation process. Similarly, a portion of the bottom product can be pumped back into the column as bottom reflux to regulate the temperature and composition of the bottom product and improve separation efficiency. Attached Figure Description

[0019] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0020] Figure 1 This is a three-dimensional appearance structure diagram of the present utility model;

[0021] Figure 2 This is a three-dimensional overall structural diagram of the heating device of this utility model;

[0022] Figure 3 This is a top view of the three-dimensional overall structure of the first distillation column of this utility model;

[0023] Figure 4 This is a three-dimensional overall structural diagram of the hot water tank of this utility model;

[0024] Figure 5 This is a side view of the three-dimensional overall structure of the circulating water tank of this utility model.

[0025] In the diagram: 1. First distillation column; 2. Feed pipe; 3. First fixing ring; 4. First support leg; 5. Connecting pipe; 6. Second distillation column; 7. Discharge pipe; 8. Second fixing ring; 9. Second support leg; 10. Heating device; 101. Heating jacket; 102. Large support plate; 103. Hot water tank; 104. Water supply pipe; 105. Small support plate; 106. Electric telescopic rod; 107. Thrust plate; 108. Piston rod; 109. Piston plate; 1010. Placement plate; 1011. Circulating water tank; 1012. Water inlet pipe; 1013. Delivery pipe; 1014. L-shaped water supply pipe; 1015. First control valve; 1016. Second control valve; 1017. Control panel; 1018. Gas heat exchanger. Detailed Implementation

[0026] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this utility model.

[0027] Example 1

[0028] like Figures 1-5 This embodiment proposes a dual-tower continuous distillation apparatus, including a first distillation tower 1, a feed pipe 2 fixedly penetrating the top of the first distillation tower 1, a first fixing ring 3 fixedly connected to the circumferential surface of the first distillation tower 1, a first support leg 4 fixedly connected to the bottom of the first fixing ring 3, a connecting pipe 5 fixedly penetrating the circumferential surface of the first distillation tower 1, a second distillation tower 6 fixedly penetrating one end of the connecting pipe 5, and the other end of the connecting pipe 5 fixedly penetrating the circumferential surface of the first distillation tower 1, a discharge pipe 7 fixedly penetrating the bottom of the second distillation tower 6, a second fixing ring 8 fixedly connected to the circumferential surface of the second distillation tower 6, a second support leg 9 fixedly connected to the bottom of the second fixing ring 8, and a heating device 10 provided on the circumferential surface of the first distillation tower 1;

[0029] The heating device 10 includes a heating jacket 101. The inner side of the heating jacket 101 is fixedly connected to the circumferential surface of the first distillation column 1. A large support plate 102 is fixedly connected to the circumferential surface of the first fixing ring 3. A hot water tank 103 is fixedly connected to the top of the large support plate 102. A water supply pipe 104 is fixedly passed through the side of the hot water tank 103. One end of the water supply pipe 104 is fixedly passed through the circumferential surface of the heating jacket 101.

[0030] A small support plate 105 is fixedly connected to the circumferential surface of the first distillation column 1. An electric telescopic rod 106 is fixedly connected to the bottom of the small support plate 105. A thrust plate 107 is fixedly connected to the telescopic end of the electric telescopic rod 106. The small support plate 105 is for supporting the electric telescopic rod 106. The electric telescopic rod 106 is for moving the thrust plate 107. The thrust plate 107 is for pushing the piston rod 108.

[0031] A piston rod 108 is fixedly connected to the bottom of the thrust plate 107. The bottom of the piston rod 108 passes through the inside of the hot water tank 103. The circumferential surface of the piston rod 108 is slidably connected to the inside of the hot water tank 103. The piston rod 108 is used to move the piston plate 109.

[0032] A piston plate 109 is fixedly connected to the bottom of the piston rod 108, and a placement plate 1010 is fixedly connected to the circumferential surface of the first fixed ring 3. The piston plate 109 is used to squeeze the water in the hot water tank 103, and the placement plate 1010 is used to place the circulating water tank 1011.

[0033] A circulating water tank 1011 is fixedly connected to the top of the placement plate 1010. An inlet pipe 1012 is fixedly passed through the top of the circulating water tank 1011. The circulating water tank 1011 is for the purpose of recycling water and saving water resources. The inlet pipe 1012 is for the purpose of allowing water to enter the circulating water tank 1011.

[0034] A conveying pipe 1013 is fixedly inserted through the side of the circulating water tank 1011. One end of the conveying pipe 1013 is fixedly inserted through the circumferential surface of the heating jacket 101. The conveying pipe 1013 is used to convey water into the circulating water tank 1011.

[0035] An L-shaped water pipe 1014 is fixedly inserted through the side of the circulating water tank 1011. One end of the L-shaped water pipe 1014 is fixedly inserted through the side of the hot water tank 103. The L-shaped water pipe 1014 is used to input water into the hot water tank 103.

[0036] A first control valve 1015 is provided on the circumferential surface of the delivery pipe 1013, and a second control valve 1016 is provided on the circumferential surface of the L-shaped water delivery pipe 1014. The first control valve 1015 and the second control valve 1016 are for controlling the water.

[0037] A control panel 1017 is provided on the side of the circulating water tank 1011, and an air heat exchanger 1018 is provided on the side of the circulating water tank 1011. The control panel 1017 is used to control the air heat exchanger 1018, which is used to heat the water in the circulating water tank 1011.

[0038] Two sets of first support legs 4 are provided, symmetrically arranged along the vertical central axis of the first fixing ring 3. Two sets of second support legs 9 are provided, symmetrically arranged along the vertical central axis of the second fixing ring 8. Two sets of heating devices 10 are provided, symmetrically arranged along the vertical central axis of the connecting pipe 5. The first support legs 4 are provided in two sets to make the first distillation column 1 more stable. The second support legs 9 are provided in two sets to make the second distillation column 6 more stable. The heating devices 10 are provided in two sets so that both the first distillation column 1 and the second distillation column 6 can be heated.

[0039] This embodiment can be used to process propylene glycol methyl ether. During the processing, when the material enters the first distillation column 1 through the feed pipe 2, the material in the first distillation column 1 needs to be heated. When the rising gas phase passes through each tray, it undergoes multiple mass and heat transfers with the falling liquid phase. Heavy components in the gas phase are continuously condensed into the liquid phase, while light components in the liquid phase are continuously vaporized into the gas phase, causing the concentration of light components in the gas phase to gradually increase. Finally, a high-purity light component product is obtained at the top of the column, thus achieving the first distillation. The operator uses heating device 10 and fills the circulating water tank 1011 with water through inlet pipe 1012. After filling the circulating water tank 1011, the operator turns on the gas-heat exchanger 1018 on the control panel 1017. The gas-heat exchanger 1018 heats the water in the circulating water tank 1011. When the water in the circulating water tank 1011 is heated, the operator opens the second control valve 1016, allowing water to enter the hot water tank 103 through the L-shaped water pipe 1014. When water enters the hot water tank 103, the operator activates the electric telescopic rod 106. When the electric telescopic rod 106 extends downwards, it drives the thrust plate 107 downwards. The movement of the piston rod 108 and piston plate 109 downwards causes the piston plate 109 to compress the water in the hot water tank 103. Due to the compression, the water in the hot water tank 103 is transported to the heating jacket 101 through the water supply pipe 104, thereby heating the material in the first distillation column 1 and realizing the first distillation of the material. When the water in the heating jacket 101 is not hot, the user opens the first control valve 1015 to allow water to enter the circulating water tank 1011 from the delivery pipe 1013. When the water enters the circulating water tank 1011, the user opens the gas heat exchanger 1018 on the circulating water tank 1011 through the control panel 1017. The gas heat exchanger 1018 heats the water in the circulating water tank 1011, and the water can be recycled, saving water resources. After the first distillation column 1 has completed the first distillation of the material, the material is input into the second distillation column 6 through the connecting pipe 5. The second distillation column 6 is located below the feed inlet. The liquid phase in the first distillation column 1 still contains a certain amount of light components. In the first distillation column 1, heat is provided by the reboiler to further vaporize the light components in the liquid phase. The content of light components in the rising vapor phase gradually increases and returns to the rectification section for further separation; while the concentration of heavy components in the descending liquid phase continuously increases. Finally, a high-purity heavy component product is obtained at the bottom of the column, and the material undergoes a second distillation. When the material is in the second distillation column 6, it needs to be heated. The heating method for the second distillation column 6 is the same as that for the first distillation column 1.

[0040] The liquid condensed at the top of the column is partially collected as product, and partially returned to the top as reflux. During its descent, the reflux comes into full contact with the rising gas phase, providing an opportunity for the condensation of heavy components in the gas phase. It also provides the necessary liquid phase for mass and heat transfer processes on the trays, helping to improve separation efficiency and ensure the stable operation of the distillation process. Similarly, a portion of the bottom product can be pumped back into the column as bottom reflux to regulate the temperature and composition of the bottom product and improve separation efficiency.

[0041] In distillation, the gas and liquid phases reach phase equilibrium on the surface of the trays or packing. According to the principle of phase equilibrium, under certain temperature and pressure, the concentrations of each component in the gas and liquid phases have a specific relationship. When the gas and liquid phases come into contact, they continuously exchange matter and heat until phase equilibrium is reached. Distillation columns utilize this phase equilibrium relationship. By controlling the operating conditions such as temperature and pressure within the column, the gas and liquid phases reach different phase equilibrium states at different locations on different trays or packing, thereby achieving the gradual separation of the components.

[0042] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A dual-tower continuous distillation apparatus, characterized in that, The first distillation column (1) is provided with a feed pipe (2) fixedly passing through the top of the first distillation column (1), a first fixing ring (3) fixedly connected to the circumferential surface of the first distillation column (1), a first support leg (4) fixedly connected to the bottom of the first fixing ring (3), a connecting pipe (5) fixedly passing through the circumferential surface of the first distillation column (1), a second distillation column (6) fixedly passing through one end of the connecting pipe (5), and the other end of the connecting pipe (5) fixedly passing through the circumferential surface of the first distillation column (1). A discharge pipe (7) is fixedly passing through the bottom of the second distillation column (6), a second fixing ring (8) fixedly connected to the circumferential surface of the second distillation column (6), a second support leg (9) fixedly connected to the bottom of the second fixing ring (8), and a heating device (10) provided on the circumferential surface of the first distillation column (1). The heating device (10) includes a heating sleeve (101), the inner side of which is fixedly connected to the circumferential surface of the first distillation column (1), a large support plate (102) is fixedly connected to the circumferential surface of the first fixing ring (3), a hot water tank (103) is fixedly connected to the top of the large support plate (102), a water supply pipe (104) is fixedly passed through the side of the hot water tank (103), and one end of the water supply pipe (104) is fixedly passed through the circumferential surface of the heating sleeve (101).

2. The dual-tower continuous distillation apparatus according to claim 1, characterized in that, A small support plate (105) is fixedly connected to the circumferential surface of the first distillation column (1). An electric telescopic rod (106) is fixedly connected to the bottom of the small support plate (105). A thrust plate (107) is fixedly connected to the telescopic end of the electric telescopic rod (106).

3. The dual-tower continuous distillation apparatus according to claim 2, characterized in that, A piston rod (108) is fixedly connected to the bottom of the thrust plate (107). The bottom of the piston rod (108) penetrates the interior of the hot water tank (103), and the circumferential surface of the piston rod (108) is slidably connected to the interior of the hot water tank (103).

4. The dual-tower continuous distillation apparatus according to claim 3, characterized in that, A piston plate (109) is fixedly connected to the bottom of the piston rod (108), and a placement plate (1010) is fixedly connected to the circumferential surface of the first fixing ring (3).

5. A dual-tower continuous distillation apparatus according to claim 4, characterized in that, A circulating water tank (1011) is fixedly connected to the top of the placement plate (1010), and an inlet pipe (1012) is fixedly passed through the top of the circulating water tank (1011).

6. A dual-tower continuous distillation apparatus according to claim 5, characterized in that, A conveying pipe (1013) is fixedly inserted through the side of the circulating water tank (1011), and one end of the conveying pipe (1013) is fixedly inserted through the circumferential surface of the heating jacket (101).

7. A dual-tower continuous distillation apparatus according to claim 6, characterized in that, An L-shaped water pipe (1014) is fixedly inserted through the side of the circulating water tank (1011), and one end of the L-shaped water pipe (1014) is fixedly inserted through the side of the hot water tank (103).

8. A dual-tower continuous distillation apparatus according to claim 7, characterized in that, A first control valve (1015) is provided on the circumferential surface of the delivery pipe (1013), and a second control valve (1016) is provided on the circumferential surface of the L-shaped water delivery pipe (1014).

9. A dual-tower continuous distillation apparatus according to claim 8, characterized in that, A control panel (1017) is provided on the side of the circulating water tank (1011), and an air heat exchanger (1018) is provided on the side of the circulating water tank (1011).

10. A dual-tower continuous distillation apparatus according to claim 9, characterized in that, The first support leg (4) is provided in two sets and is symmetrical to each other along the vertical central axis of the first fixing ring (3). The second support leg (9) is provided in two sets and is symmetrical to each other along the vertical central axis of the second fixing ring (8). The heating device (10) is provided in two sets and is symmetrical to each other along the vertical central axis of the connecting pipe (5).

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