Extracting and rectifying device for aromatic hydrocarbon

Abstract

The utility model belongs to the technical field of rectification devices, and particularly relates to an extraction rectification device for aromatic hydrocarbon, which comprises a rectification tower, the rectification tower consists of an upper tower body and a lower tower body, the upper tower body is fixedly connected with the lower tower body, and a plurality of heaters are fixedly connected to the lower part in the lower tower body. A circulation pipeline penetrating through the upper tower body and the lower tower body is fixedly connected to the center of the lower tower body, and a condensation assembly is mounted in the upper tower body; the contact area of steam and cooling water is increased through the condensation pipe, the cooling rate is improved, compared with the prior art, the condensation pipe is a two-way channel, the liquidity of the cooling water is improved, heat rising caused by poor liquidity of the cooling water after heat absorption is avoided, and the condensation effect of the condensation pipe is relatively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of distillation devices, in particular to an extraction and distillation device for aromatic hydrocarbons. Background Art

[0002] Distillation is a separation process that utilizes the different volatilities of components in a mixture to separate them. Distillation is usually carried out in a distillation tower. The gas-liquid two phases contact each other through countercurrent flow to carry out interphase heat and mass transfer. The volatile components in the liquid phase enter the gas phase, and the less volatile components in the gas phase transfer to the liquid phase. Therefore, almost pure volatile components can be obtained at the top of the tower, and almost pure less volatile components can be obtained at the bottom of the tower. The feed liquid is added from the middle of the tower. The tower section above the feed port further concentrates the volatile components in the rising vapor, which is called the distillation section; the tower section below the feed port extracts the volatile components from the descending liquid, which is called the stripping section. The vapor drawn out from the top of the tower is condensed, and a part of the condensate is returned to the distillation tower from the top of the tower as reflux liquid, and the remaining distillate is the top product. The liquid drawn out from the bottom of the tower is partially vaporized by the reboiler, and the vapor rises along the tower, and the remaining liquid is the bottom product. The ratio of the amount of liquid refluxed into the tower from the top of the tower to the amount of the top product is called the reflux ratio, and its size will affect the separation effect and energy consumption of the distillation operation.

[0003] The existing Chinese patent with announcement number CN214260739U discloses a distillation separation device for the production of high-boiling aromatic solvents, wherein a water tank is installed at the upper end of the distillation barrel body, and a collecting box is installed at the inner upper end of the distillation barrel body, and condensing tubes extending to the inside of the collecting box are evenly installed at the bottom of the water tank at equal intervals, and a raw material box is installed at the middle section of the distillation barrel body. The utility model has a simple structure, and the heating area of ​​the raw material is increased by the staggered arrangement of the heating rods and the shunt pipes, thereby improving the utilization rate of thermal energy. The insertion type arrangement of the condensing tube increases the contact area between the steam and the cooling water, and improves the cooling rate. The arrangement of the expansion tube and the heating ring facilitates the control of the temperature of the gas pipeline to prevent the steam from liquefying in advance. In addition, by controlling the temperature of the gas pipeline, it is also beneficial to distinguish impurities in the steam, so that the impurities are liquefied in advance and reflux to the inside of the raw material box, thereby improving the purity of the product.

[0004] With respect to the above-mentioned and existing related technologies, the inventors believe that the following defects often exist: the device is cooled by contacting the condenser with the steam, and the condenser is a one-way channel, the internal cooling water circulation efficiency is relatively weak, and the temperature after absorbing heat is relatively high, so that the cooling effect at the condenser needs to be further improved; therefore, in view of the above problems, an extraction and distillation device for aromatic hydrocarbons is proposed. Utility Model Content

[0005] In order to make up for the deficiencies of the prior art and solve the above-mentioned technical problems, the utility model proposes an extraction and distillation device for aromatic hydrocarbons.

[0006] The technical solution adopted by the utility model to solve its technical problems is: the utility model is an extraction and distillation device for aromatic hydrocarbons, comprising a distillation tower, the distillation tower is composed of an upper tower body and a lower tower body, the upper tower body and the lower tower body are fixedly connected, a plurality of heaters are fixedly connected to the lower part of the interior of the lower tower body, a flow pipe that runs through the upper tower body and the lower tower body is fixedly connected at the center of the lower tower body, a condensation component is installed inside the upper tower body, the condensation component comprises two diverter plates, a plurality of condensing tubes distributed in an annular manner are fixedly connected to the opposite sides of the two diverter plates, a rotary joint is fixedly connected to the center of the other side of the diverter plate, a liquid inlet end and a liquid outlet end are rotatably connected at the center of the side walls of the two rotary joints, the liquid inlet end is connected to a water pump through a pipeline, and cooling water is pumped from the liquid inlet end into the condensing tube by the water pump. The interior of the tower body is connected to the liquid inlet and the liquid outlet is refluxed into the cooling water pool to achieve recycling. The liquid inlet and the liquid outlet respectively penetrate the upper tower body, the lower side wall of the upper tower body is provided with a discharge end, the upper side wall of the lower tower body is provided with a feed end, valves are respectively provided on the discharge end and the feed end, raw materials required for aromatics production are added to the interior of the lower tower body through the feed end, the raw materials are heated by the heater, the steam generated by the heating enters the interior of the upper tower body through the circulation pipeline for condensation, is extracted and cooled by a water pump and enters the interior of the condensation component, the contact area between the steam and the cooling water is increased through the condenser, the cooling rate is increased, and the condenser is a two-way channel to improve the fluidity of the cooling water, avoid the heat rise due to the poor fluidity of the cooling water after heat absorption, and relatively improve the condensation effect of the condenser, the condensed raw materials fall into the interior of the upper tower body, and are then discharged from the discharge end.

[0007] Preferably, a plurality of blades distributed in a ring are fixedly connected to the inner wall of the rotary joint. When the cooling water flows, the blades are pushed to rotate. Through the cooperation of the cooling water and the blades, the condenser is rotated. The condensed raw materials on the surface of the condenser can be thrown off by centrifugal force, thereby improving the collection efficiency of the raw materials. At the same time, the condenser rotates and fully contacts with the steam, so that the condenser is fully utilized.

[0008] Preferably, the top end of the circulation pipe is sealed, the bottom end of the circulation pipe is open, a plurality of air outlets are provided on the surface of the circulation pipe in the area of ​​the upper tower body, and the top end of the circulation pipe is sealed to prevent condensed water drops from dripping in.

[0009] Preferably, the circulation duct is provided with a plurality of air inlets on the surface of the area where the lower tower body is located. The air inlet channel is designed to be trumpet-shaped with a large outside and a small inside to prevent the discharge of filtered impurities. The steam inside the lower tower body enters the circulation duct through the air inlet and is discharged into the upper tower body through the air outlet.

[0010] Preferably, a plurality of reflux ports are provided on the lower side wall of the circulation conduit, and a threaded groove is tapped on the bottom end of the circulation conduit, so that the reflux ports allow the raw materials inside the circulation channel to flow back into the lower tower body.

[0011] Preferably, an impurity filtering assembly is installed inside the circulation pipe, and the impurity filtering assembly includes a slide groove and a filter plate. The slide groove is opened on the inner wall of the circulation pipe, and the filter plate is installed inside the circulation pipe, and the filter plate is slidably connected to the slide groove, so that impurities in the steam can be filtered through the filter plate.

[0012] Preferably, a screw is threadedly connected at the center of the filter plate, and the top end of the screw is rotatably connected to the circulation pipe. The height of the filter plate is adjusted by rotating the screw so that the filter plate is located between the air inlet and the air outlet for filtering. When the filter plate needs to be cleaned, the filter plate can be lowered by rotating the screw in the opposite direction, and the filter plate can be taken out from the inside of the circulation pipe for easy cleaning.

[0013] Preferably, the impurity filtering assembly further comprises a sealing cover, which is threadedly connected to the bottom end of the circulation pipe, and the bottom end of the circulation channel is sealed by the sealing cover. The impurities collected inside the circulation pipe can be discharged by opening the sealing cover.

[0014] Preferably, an annular filter screen is fixedly connected to the top of the sealing cover, and the impurities at the reflux port are intercepted by the filter screen to prevent the impurities inside the circulation pipe from flowing out.

[0015] The utility model is beneficial in that:

[0016] 1. The utility model increases the contact area between steam and cooling water through the condenser and improves the cooling rate. Compared with the prior art, the condenser is a two-way channel to improve the fluidity of cooling water, avoid heat rise due to poor cooling water fluidity after heat absorption, and relatively improve the condensation effect of the condenser.

[0017] 2. The utility model can filter impurities in the steam through the filter plate, and by rotating the lead screw in the opposite direction to lower the filter plate, the filter plate can be quickly taken out from the inside of the flow pipe, which is convenient for cleaning. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0019] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0020] Figure 2 This is a cross-sectional view of the distillation tower of the utility model;

[0021] Figure 3 This is a cross-sectional view of the rotary joint of the utility model;

[0022] Figure 4 This is a schematic diagram of the circulation pipeline structure of the utility model;

[0023] Figure 5 It is a cross-sectional view of the circulation pipeline of the utility model.

[0024] In the figure: 1. distillation tower; 11. upper tower body; 12. lower tower body; 2. heater; 3. circulation pipeline; 4. condensation component; 41. diverter plate; 42. condenser; 43. rotary joint; 44. liquid inlet end; 45. liquid outlet end; 46. blade; 5. air inlet; 6. reflux port; 7. impurity filtering component; 71. slide; 72. filter plate; 73. screw; 74. sealing cover; 75. filter screen; 8. discharge end; 9. feed end; 10. air outlet. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] Embodiment 1

[0027] See also Figure 1-3As shown, an extraction and distillation device for aromatic hydrocarbons includes a distillation tower 1, which is composed of an upper tower body 11 and a lower tower body 12. The upper tower body 11 and the lower tower body 12 are fixedly connected, and a plurality of heaters 2 are fixedly connected to the lower part of the lower tower body 12. A flow pipe 3 that runs through the upper tower body 11 and the lower tower body 12 is fixedly connected at the center of the lower tower body 12. A condensation component 4 is installed inside the upper tower body 11. The condensation component 4 includes two diverter plates 41. A plurality of condensing pipes 42 distributed in an annular shape are fixedly connected to the opposite sides of the two diverter plates 41. A rotary joint 43 is fixedly connected to the center of the other side of the diverter plate 41. A liquid inlet end 44 and a liquid outlet end 45 are rotatably connected to the center of the side walls of the two rotary joints 43, respectively. The liquid inlet end 44 is connected to a water pump through a pipeline. The cooling water is pumped by the water pump from the liquid inlet end 44 into the interior of the condensing pipe 42, and is refluxed and discharged into the liquid outlet end 45. A cooling water pool is used for recycling. A liquid inlet 44 and a liquid outlet 45 respectively penetrate the upper tower body 11. A discharge end 8 is installed on the lower side wall of the upper tower body 11. A feeding end 9 is installed on the upper side wall of the lower tower body 12. Valves are installed on the discharge end 8 and the feeding end 9 respectively. Raw materials required for aromatic production are added to the lower tower body 12 through the feeding end 9. The raw materials are heated by the heater 2. The steam generated by the heating enters the upper tower body 11 through the flow pipe 3 for condensation. The steam is extracted and cooled by a water pump and enters the internal circulation of the condensation component 4. The contact area between the steam and the cooling water is increased through the condenser 42, and the cooling rate is improved. The condenser 42 is a two-way channel to improve the fluidity of the cooling water, avoid the heat rise caused by the poor fluidity of the cooling water after heat absorption, and relatively improve the condensation effect of the condenser 42. The condensed raw materials fall into the upper tower body 11 and are then discharged from the discharge end 8.

[0028] The inner wall of the rotary joint 43 is fixedly connected with a plurality of blades 46 distributed in a ring shape. When the cooling water flows, the blades 46 are pushed to rotate. Through the cooperation of the cooling water and the blades 46, the condenser 42 is rotated. The condensed raw materials on the surface of the condenser 42 can be thrown off by the centrifugal force, thereby improving the collection efficiency of the raw materials. At the same time, the condenser 42 rotates and fully contacts with the steam, so that the condenser 42 is fully utilized.

[0029] The top of the circulation pipe 3 is sealed, and the bottom of the circulation pipe 3 is open. The surface of the circulation pipe 3 located at the upper tower body 11 is provided with a plurality of air outlets 10. The top of the circulation pipe 3 is sealed to prevent condensed water drops from dripping in.

[0030] A plurality of air inlets 5 are provided on the surface of the circulation pipe 3 located in the area of ​​the lower tower body 12. The channel of the air inlet 5 is designed to be in a trumpet shape with a large outside and a small inside to prevent the discharge of filtered impurities. The steam inside the lower tower body 12 enters the interior of the circulation pipe 3 through the air inlet 5, and is discharged from the air outlet 10 into the interior of the upper tower body 11.

[0031] A plurality of reflux ports 6 are provided on the lower side wall of the circulation pipe 3 . A threaded groove is formed on the bottom of the circulation pipe 3 . The reflux ports 6 allow the raw materials in the circulation pipe 3 to reflux into the lower tower body 12 .

[0032] Embodiment 2

[0033] For comparison with Example 1, please refer to Figure 4-5 As shown, the utility model provides another embodiment, an impurity filtering assembly 7 is installed inside the circulation pipe 3, and the impurity filtering assembly 7 includes a plurality of slide grooves 71 and filter plates 72. The slide grooves 71 are opened on the inner wall of the circulation pipe 3, and the filter plates 72 are installed inside the circulation pipe 3, and the filter plates 72 are slidably connected to the slide grooves 71, so that impurities in the steam can be filtered through the filter plates 72.

[0034] A lead screw 73 is threadedly connected at the center of the filter plate 72, and the top end of the lead screw 73 is rotatably connected to the circulation pipe 3. The height of the filter plate 72 is adjusted by rotating the lead screw 73 so that the filter plate 72 is located between the air inlet 5 and the air outlet 10 for filtering. When the filter plate 72 needs to be cleaned, the lead screw 73 is rotated in the opposite direction to lower the filter plate 72, and the filter plate 72 can be taken out from the inside of the circulation pipe 3 for easy cleaning.

[0035] The impurity filtering assembly 7 also includes a sealing cover 74, which is threadedly connected to the bottom end of the circulation pipe 3. The bottom end of the circulation pipe 3 is sealed by the sealing cover 74. By opening the sealing cover 74, impurities collected inside the circulation pipe 3 can be discharged.

[0036] An annular filter screen 75 is fixedly connected to the top of the sealing cover 74 , and the filter screen 75 is used to intercept impurities at the reflux port 6 , thereby preventing the impurities inside the circulation pipe 3 from flowing out.

[0037] The parts not involved in the device are the same as those in the prior art or can be implemented by using the prior art.

[0038] The working principle is as follows: the raw materials required for the production of aromatics are added to the lower tower body 12 through the feeding end 9, the raw materials are heated by the heater 2, and the steam generated by the heating enters the upper tower body 11 through the flow pipe 3 for condensation, and is extracted and cooled by a water pump to circulate in the condensation component 4. The contact area between the steam and the cooling water is increased through the condenser pipe 42, and the cooling rate is increased. The condenser pipe 42 is a two-way channel to increase the fluidity of the cooling water, avoid heat rise due to poor cooling water fluidity after heat absorption, and relatively improve the condensation effect of the condenser pipe 42. The condensed raw materials fall into the upper tower body 11 and are then discharged from the discharge end 8.

[0039] When cooling water flows, it pushes blades 46 to rotate. Through the cooperation of cooling water and blades 46, the condenser 42 rotates. The condensed raw materials on the surface of the condenser 42 can be thrown off by centrifugal force, thereby improving the collection efficiency of the raw materials. At the same time, the condenser 42 rotates and fully contacts with the steam, so that the condenser 42 is fully utilized.

[0040] The steam inside the lower tower body 12 enters the interior of the circulation pipe 3 through the air inlet 5, and is discharged from the air outlet 10 into the interior of the upper tower body 11. The height of the filter plate 72 is adjusted by rotating the screw 73 so that the filter plate 72 is located between the air inlet 5 and the air outlet 10 for filtering. When the filter plate 72 needs to be cleaned, the filter plate 72 is lowered by rotating the screw 73 in the opposite direction, and the filter plate 72 can be taken out from the interior of the circulation pipe 3 for easy cleaning.

[0041] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0042] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, and these changes and improvements fall within the scope of the utility model to be protected.

Claims

1. An extractive distillation device for aromatic hydrocarbons, comprising a distillation tower (1), characterized in that: The distillation tower (1) is composed of an upper tower body (11) and a lower tower body (12), wherein the upper tower body (11) and the lower tower body (12) are fixedly connected, a plurality of heaters (2) are fixedly connected to the lower part of the lower tower body (12), a flow pipe (3) penetrating the upper tower body (11) and the lower tower body (12) is fixedly connected to the center of the lower tower body (12), a condensation assembly (4) is installed inside the upper tower body (11), and the condensation assembly (4) includes two diverter plates (41), and the two diverter plates (42) are connected to the lower tower body (12). 1) is fixedly connected to a plurality of condensing tubes (42) distributed in an annular shape on the opposite side of the diverter plate (41); a rotating joint (43) is fixedly connected to the center of the other side of the diverter plate (41); a liquid inlet end (44) and a liquid outlet end (45) are rotatably connected to the center of the side walls of the two rotating joints (43); the liquid inlet end (44) and the liquid outlet end (45) respectively penetrate the upper tower body (11); a material outlet end (8) is installed on the lower side wall of the upper tower body (11); and a material supply end (9) is installed on the upper side wall of the lower tower body (12).

2. The extractive distillation device for aromatics according to claim 1, characterized in that: A plurality of blades (46) distributed in an annular shape are fixedly connected to the inner wall of the rotary joint (43).

3. The extractive distillation device for aromatic hydrocarbons according to claim 1, characterized in that: The top end of the circulation pipe (3) is sealed, the bottom end of the circulation pipe (3) is open, and a plurality of air outlets (10) are provided on the surface of the circulation pipe (3) in the area located at the upper tower body (11).

4. The extractive distillation device for aromatics according to claim 1, characterized in that: A plurality of air inlets (5) are provided on the surface of the circulation pipe (3) in the area located at the lower tower body (12).

5. The extractive distillation device for aromatics according to claim 1, characterized in that: The lower side wall of the circulation pipe (3) is provided with a plurality of return ports (6), and the bottom end of the circulation pipe (3) is tapped to provide a thread groove.

6. The extractive distillation device for aromatic hydrocarbons according to claim 1, characterized in that: An impurity filter assembly (7) is installed inside the circulation pipe (3), and the impurity filter assembly (7) comprises a plurality of slide grooves (71) and filter plates (72). The slide grooves (71) are provided on the inner wall of the circulation pipe (3), and the filter plates (72) are installed inside the circulation pipe (3), and the filter plates (72) are slidably connected to the slide grooves (71).

7. The extractive distillation device for aromatic hydrocarbons according to claim 6, characterized in that: A lead screw (73) is threadedly connected at the center of the filter plate (72), and the top end of the lead screw (73) is rotatably connected to the flow pipe (3).

8. The extractive distillation device for aromatic hydrocarbons according to claim 6, characterized in that: The impurity filtering assembly (7) further comprises a sealing cover (74), and the sealing cover (74) is threadedly connected to the bottom end of the circulation pipeline (3).

9. The extractive distillation device for aromatic hydrocarbons according to claim 8, characterized in that: An annular filter screen (75) is fixedly connected to the top of the sealing cover (74).

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