High-efficiency and high-purity rectification purification device

Abstract

The embodiment of the utility model provides a high-efficiency and high-purity rectification purification device, and relates to the technical field of rectification purification. A high-efficiency and high-purity rectification purification device comprises a reactor, dehydrated materials in the reactor enter a first rectification tower after being subjected to heat exchange through a heat exchanger, materials in a tower kettle of the first rectification tower are conveyed to a second rectification tower through a first conveying pump, and materials in a tower kettle of the second rectification tower are conveyed to a third rectification tower through a second conveying pump; materials at the top of the third rectifying tower enter the fourth rectifying tower through a third conveying pump, at least two filler layers are arranged in the first rectifying tower, a material distributing mechanism is installed on the filler layer located at the bottom, and the material distributing mechanism evenly distributes materials through rotation. According to the utility model, through the meshing of the gear I and the gear III and the meshing of the gear IV and the gear II, the feeding pipe drives the loading pipe to rotate in the annular groove, so that materials are uniformly loaded, the materials are fully contacted with a packing layer, the reaction effect of the materials is accelerated, and the purification efficiency is improved.

Description

Technical Field

[0001] The present application relates to the technical field of distillation and purification, and in particular to a high-efficiency and high-purity distillation and purification device. Background Art

[0002] BDO (1,4-butanediol) is an important organic chemical and fine chemical raw material. BDO and its derivatives can be widely used in PBT plastics, spandex, polyurethane, pharmaceuticals, cosmetics and other fields. When BDO raw materials are mixed with other materials and then distilled and purified, distillation and purification equipment is usually used.

[0003] Distillation is usually carried out in a distillation tower, where the gas and liquid phases contact each other through countercurrent flow and conduct 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 are transferred to the liquid phase. As a result, 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 inlet further concentrates the volatile components in the rising vapor, which is called the distillation section; the tower section below the feed inlet 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 a 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.

[0004] In the prior art, the liquid to be separated directly enters the tower through the feed pipe and falls on the packing layer, and then contacts and reacts with the gas phase. Since the liquid to be separated cannot be sprinkled on the packing layer over a large area, that is, the contact area between the two is small, the separation and purification effect is reduced, and then the distillation effect and distillation efficiency are reduced. At the same time, when the steam moves to the top of the tower, it will contact the tower body, so some liquid phase will adhere to the tower body. When the liquid phase flows downward along the tower body, it is not convenient to flow to the middle of the packing layer, and it is difficult to fully contact the packing layer. Utility Model Content

[0005] The present application aims to solve at least one of the technical problems in the prior art that the liquid to be separated directly enters the tower through the feed pipe and falls on the packing layer, and then contacts and reacts with the gas phase. Since the liquid to be separated cannot be sprinkled on the packing layer in a large range, that is, the contact area between the two is small, the separation and purification effect is reduced, and then the distillation effect and distillation efficiency are reduced. To this end, the present application proposes a high-efficiency and high-purity distillation and purification device.

[0006] According to an embodiment of the present application, a high-efficiency and high-purity distillation purification device includes a reactor, wherein the dehydrated material in the reactor enters a first distillation tower after heat exchange through a heat exchanger, the material in the bottom of the first distillation tower is transported to a second distillation tower through a first delivery pump, the material in the bottom of the second distillation tower is transported to a third distillation tower through a second delivery pump, and the material at the top of the third distillation tower enters a fourth distillation tower through a third delivery pump, wherein:

[0007] At least two packing layers are arranged in the first distillation tower, and a material distribution mechanism is installed on the packing layer at the bottom, and the material distribution mechanism distributes the material evenly by rotating.

[0008] Furthermore, the material distribution mechanism includes an annular sleeve located inside the first distillation tower, an annular groove is provided in the annular sleeve, two sliders are slidably arranged in the annular groove, a connecting rod is provided on one side of the two sliders, a feeding pipe is provided between the two connecting rods, and a feeding nozzle is installed on the feeding pipe.

[0009] Furthermore, a feed pipe is arranged at the center of the feeding pipe, and the upper end of the feed pipe is rotatably connected to a conveying pipe arranged on the wall surface of the first distillation tower.

[0010] Furthermore, the outside of the feed pipe is connected to gear one, a slide groove is provided on the inner wall of the first distillation tower, a rotating rod is rotatably arranged on the wall of the slide groove, one end of the rotating rod is connected to gear three, and the gear three is meshed with gear one.

[0011] Furthermore, an arc-shaped blocking cover is provided at the discharge port of the conveying pipe.

[0012] Furthermore, a pair of connecting plates arranged up and down are slidably arranged in the slide groove, a collector is arranged on one side of the connecting plate, the upper side of the collector is in contact with the inner wall of the first distillation tower, and the two collectors are respectively located on the upper sides of the two packing layers.

[0013] Furthermore, a screw rod is rotatably arranged in the slide groove, and the screw rod is driven by a motor. The lower end of the screw rod is connected to gear two, and the other end of the rotating rod is connected to gear four. Gear two is meshed with gear four, and the connecting plate is threadedly connected to the screw rod.

[0014] Furthermore, a reflux pipe is arranged on the upper side of the first distillation tower.

[0015] Furthermore, the tops of the first distillation tower, the second distillation tower and the fourth distillation tower are connected to the first condenser, the second condenser and the third condenser respectively.

[0016] Furthermore, the material extracted from the upper part of the fourth distillation tower is cooled by a cooler and then enters a storage tank.

[0017] 1. The beneficial effect of the present application is that the material is distilled and purified multiple times through the first distillation tower, the second distillation tower, the third distillation tower and the fourth distillation tower, and the distilled material is refluxed by using the first condenser, the second condenser and the third condenser, so that the impure material enters the distillation tower of the previous process again for distillation again, thereby improving the accuracy and purity of the material purification.

[0018] 2. The beneficial effect of the present application is that through the meshing of gear one and gear three, and the meshing of gear four and gear two, the feed pipe rotates with the loading pipe in the annular groove, so that the material is evenly loaded, the material is fully in contact with the packing layer, the reaction effect of the material is accelerated, and the purification efficiency is improved.

[0019] 3. The beneficial effect of the present application is that when the screw rotates, the two connecting plates move the collector up and down, so that the collector scrapes the liquid on the inner wall of the first distillation tower, so that the liquid flows into the packing layer along the internal arc part of the collector, thereby promoting full contact between the liquid and the packing layer.

[0020] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a schematic diagram of the overall structure purification state according to an embodiment of the present application;

[0023] Figure 2 is a schematic structural diagram of a first distillation tower according to an embodiment of the present application;

[0024] Figure 3 is a schematic cross-sectional view of the structure of the first distillation tower according to an embodiment of the present application;

[0025] Figure 4 According to the embodiment of the present application Figure 4 A schematic diagram of the structure at A;

[0026] Figure 5 is a partial schematic diagram of the structure of the first distillation tower according to an embodiment of the present application;

[0027] Figure 6 This is a schematic diagram of the disassembly of the feeding pipe structure according to an embodiment of the present application;

[0028] Figure 7 It is a schematic diagram of the collector structure according to an embodiment of the present application.

[0029] Icons: 1. Reactor; 2. Heat exchanger; 3. First distillation tower; 31. Reflux pipe; 32. Packing layer; 33. Annular sleeve; 331. Annular groove; 332. Slider; 333. Connecting rod; 334. Loading pipe; 335. Feed pipe; 336. Gear one; 34. Delivery pipe; 341. Cover; 35. Slide; 36. Collector; 361. Connecting plate; 37. Screw; 371. Gear two; 38. Rotating rod; 381. Gear three; 382. Gear four; 4. Second distillation tower; 5. Third distillation tower; 6. Fourth distillation tower; 7. First condenser; 8. Second condenser; 9. Third condenser; 10. First delivery pump; 11. Second delivery pump; 12. Third delivery pump; 13. Cooler; 14. Storage tank. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0031] In order to make the purpose, technical solutions and advantages of the implementation methods of this application clearer, the technical solutions in the implementation methods of this application will be clearly and completely described below in conjunction with the drawings in the implementation methods of this application. Obviously, the described implementation methods are part of the implementation methods of this application, not all of the implementation methods. Based on the implementation methods in this application, all other implementation methods obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0032] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents the selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0033] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0034] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0035] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0036] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0037] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0038] A high-efficiency and high-purity distillation and purification device according to an embodiment of the present application is described below with reference to the accompanying drawings.

[0039] like Figure 1-Figure 7As shown, according to an embodiment of the present application, a high-efficiency and high-purity distillation purification device includes a reactor 1. BDO transported from the outside and the circulating material are mixed and preheated by the heat exchanger 2. The material temperature is heated to 253°C, and the liquid state is changed into a gaseous state and enters the reactor 1 filled with CaO-SiO2-ZrO2 for dehydration reaction. The reaction temperature is 350°C and the pressure is 120KPa.

[0040] Among them, the crude BTO material after the reaction is cooled by heat exchange through the heat exchanger 2. The temperature of the crude BTO after cooling is: 75-80°C and enters the first distillation tower 3. The top material of the first distillation tower 3 is condensed by the first condenser 7, and the liquid is returned to the first distillation tower 3 as reflux liquid. The non-condensable gas is removed and sent to the flare system. The bottom material of the first distillation tower 3 enters the middle part of the second distillation tower 4 through the first delivery pump 10 for vacuum distillation. After the top of the second distillation tower 4 is condensed by the second condenser 8, part of the material is used as the top reflux, and the other part of the light components is sent to the waste liquid incineration device for treatment. The bottom material of the second distillation tower 4 is pumped into the third distillation tower 5 by the second delivery pump 11.

[0041] The condensate at the top of the third distillation tower 5 is divided into three parts, and part of the condensate is used as reflux to the third distillation tower 5 through a partial condenser, part is extracted as an industrial-grade BTO product with a purity of ≥98.5%, and the remaining part enters the fourth distillation tower 6 as raw material feed.

[0042] Furthermore, the materials in the bottom of the third distillation tower 5 are divided into two parts: a part of the circulating material is mixed with the raw material BDO as a medium to inhibit side reactions and enters the reactor 1, and the remaining part is sent to the waste liquid incineration device as a heavy component for treatment. At the same time, the industrial-grade BTO at the top of the third distillation tower 5 enters the middle and lower parts of the fourth distillation tower 6 through the third delivery pump 12.

[0043] After the gas phase at the top of the fourth distillation tower 6 passes through the third condenser 9, the condensate is divided into three parts, one part is used as the reflux of the fourth distillation tower 6, one part is circulated back to the feed inlet of the second distillation tower 4 and enters the second distillation tower 4 together with the materials in the bottom of the first distillation tower 3 for distillation, and the remaining part of the light component circulating material is mixed with the raw material BDO and enters the reactor 1 for recycling.

[0044] The main components of the heavy components at the bottom of the fourth distillation tower 6 are BDO and BTO, so the bottom liquid of the fourth distillation tower 6 is recovered in two parts: one part is circulated back to the inlet of the third distillation tower 5 and enters the third distillation tower 5 together with the bottom material of the second distillation tower 4 for further purification, and the other part of the heavy components containing BDO is recycled and mixed with the raw material BDO and enters the reactor 1 together. The BTO product extracted from the middle and upper part of the fourth distillation tower 6 enters the product storage tank 14 through the product cooler 13.

[0045] The internal structures of the first distillation tower 3, the second distillation tower 4, the third distillation tower 5 and the fourth distillation tower 6 are substantially the same, wherein at least two packing layers 32 are arranged in the first distillation tower 3, and a distribution mechanism is installed on the packing layer 32 at the bottom, and the distribution mechanism distributes the material evenly by rotating so that the material is in full contact with the packing layer 32.

[0046] Specifically, the material distribution mechanism includes an annular sleeve 33 located inside the first distillation tower 3, the annular sleeve 33 is fixed on the inner wall of the first distillation tower 3, an annular groove 331 is opened in the annular sleeve 33, two sliders 332 are slidably arranged in the annular groove 331, a connecting rod 333 is arranged on one side of the two sliders 332, a feeding pipe 334 is arranged between the two connecting rods 333, a feeding nozzle is installed on the feeding pipe 334, and the feeding pipe 334 is driven by the slider 332 to slide in the annular groove 331, so that the material in the feeding pipe 334 is evenly distributed on the packing layer 32.

[0047] At the same time, a feed pipe 335 is arranged at the center of the loading pipe 334. The upper end of the feed pipe 335 is rotatably connected to the delivery pipe 34 arranged on the wall of the first distillation tower 3. The feed port of the delivery pipe 34 extends out of the first distillation tower 3. The feed port of the feed pipe 335 is connected to the discharge port of the delivery pipe 34, and the feed pipe 335 can rotate inside the delivery pipe 34.

[0048] Furthermore, a gear 1 336 is connected to the outside of the feed pipe 335, a slide groove 35 is opened on the inner wall of the first distillation tower 3, a rotating rod 38 is rotatably arranged on the wall of the slide groove 35, one end of the rotating rod 38 is connected to a gear 3 381, when the rotating rod 38 rotates, the gear 3 381 is caused to mesh with the gear 1 336, at this time, the gear 1 336 rotates with the feed pipe 335, and the feed pipe 335 rotates automatically with the loading pipe 334 in the annular groove 331.

[0049] In addition, an arc-shaped blocking cover 341 is provided at the discharge port of the conveying pipe 34 , and the blocking cover 341 blocks the gear three 381 and the gear one 336 .

[0050] In order to make the rotating rod 38 rotate automatically, a screw rod 37 is rotatably set in the slide groove 35, and the screw rod 37 is driven by a motor. The lower end of the screw rod 37 is connected to gear 2 371, and the other end of the rotating rod 38 is connected to gear 4 382. When the screw rod 37 rotates with gear 2 371, gear 2 371 is meshed with gear 4 382, ​​and gear 4 382 rotates with the rotating rod 38.

[0051] It is worth mentioning that a pair of connecting plates 361 arranged up and down are slidably set in the slide groove 35, and a collector 36 is set on one side of the connecting plate 361. The collector 36 has a conical structure with a larger upper part and a smaller lower part. The upper side of the collector 36 is in contact with the inner wall of the first distillation tower 3, and the two collectors 36 are respectively located on the upper side of the two packing layers 32. They are threadedly connected to the screw 37 through the connecting plate 361. When the screw 37 rotates, the connecting plate 361 moves up and down with the collector 36 on the inner wall of the first distillation tower 3. The collector 36 scrapes the liquid on the inner wall of the first distillation tower 3, so that the liquid slides downward along the inner wall of the collector 36 and drips onto the packing layer 32.

[0052] A reflux pipe 31 is provided on the upper side of the first distillation tower 3 , and the reflux pipe 31 is connected to the first condenser 7 for tower top reflux.

[0053] The working principle of a high-efficiency and high-purity distillation and purification device is as follows: the material enters the feeding pipe 334 through the feeding pipe 34. At this time, the motor drives the screw 37 to rotate, so that the screw 37 rotates with the gear 2 371. Through the meshing of the gear 2 371 and the gear 4 382, ​​the gear 4 382 rotates with the rotating rod 38. After the gear 381 meshes with the gear 1 336, the gear 1 336 rotates with the feeding pipe 335 and the feeding pipe 334 in the annular groove 331 to achieve uniform feeding of the material. At the same time, the connecting plate 361 on the screw 37 moves up and down with the collector 36 to scrape the liquid on the inner wall of the first distillation tower 3, so that the liquid drips onto the packing layer 32 along the collector 36.

[0054] The above are only embodiments of the present application and are not intended to limit the scope of protection of the present application. For those skilled in the art, the present application may have various changes and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0055] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A high-efficiency and high-purity distillation purification device, comprising a reactor (1), characterized in that: The dehydrated material in the reactor (1) enters the first distillation tower (3) after heat exchange through the heat exchanger (2), the material in the bottom of the first distillation tower (3) is transported to the second distillation tower (4) through the first delivery pump (10), the material in the bottom of the second distillation tower (4) is transported to the third distillation tower (5) through the second delivery pump (11), and the material at the top of the third distillation tower (5) enters the fourth distillation tower (6) through the third delivery pump (12), wherein: At least two packing layers (32) are arranged in the first distillation tower (3), and a material distribution mechanism is installed on the packing layer (32) at the bottom, and the material distribution mechanism distributes the material evenly by rotating.

2. The high-efficiency and high-purity distillation purification device according to claim 1, characterized in that: The material distribution mechanism comprises an annular sleeve (33) located inside the first distillation tower (3), an annular groove (331) is provided in the annular sleeve (33), two sliders (332) are slidably arranged in the annular groove (331), a connecting rod (333) is arranged on one side of the two sliders (332), a feeding pipe (334) is arranged between the two connecting rods (333), and a feeding nozzle is installed on the feeding pipe (334).

3. The high-efficiency and high-purity distillation purification device according to claim 2, characterized in that: A feed pipe (335) is arranged at the center of the feed pipe (334), and the upper end of the feed pipe (335) is rotatably connected to a conveying pipe (34) arranged on the wall surface of the first distillation tower (3).

4. The high-efficiency and high-purity distillation purification device according to claim 3 is characterized in that: The feed pipe (335) is externally connected to gear one (336); a slide groove (35) is provided on the inner wall of the first distillation tower (3); a rotating rod (38) is rotatably arranged on the wall of the slide groove (35); one end of the rotating rod (38) is connected to gear three (381); and gear three (381) is meshed with gear one (336).

5. The high-efficiency and high-purity distillation purification device according to claim 4, characterized in that: An arc-shaped blocking cover (341) is provided at the discharge port of the conveying pipe (34).

6. The high-efficiency and high-purity distillation purification device according to claim 5, characterized in that: A pair of connecting plates (361) arranged vertically are slidably disposed in the slide groove (35), a collector (36) is disposed on one side of the connecting plate (361), the upper side of the collector (36) is in contact with the inner wall of the first distillation tower (3), and the two collectors (36) are respectively located on the upper sides of the two packing layers (32).

7. The high-efficiency and high-purity distillation purification device according to claim 6, characterized in that: A screw rod (37) is rotatably arranged in the slide groove (35), and the screw rod (37) is driven by a motor. The lower end of the screw rod (37) is connected to gear 2 (371), and the other end of the rotating rod (38) is connected to gear 4 (382). Gear 2 (371) is meshed with gear 4 (382), and the connecting plate (361) is threadedly connected to the screw rod (37).

8. The high-efficiency and high-purity distillation purification device according to claim 7, characterized in that: A reflux pipe (31) is provided on the upper side of the first distillation tower (3).

9. The high-efficiency and high-purity distillation purification device according to claim 1, characterized in that: The tops of the first distillation tower (3), the second distillation tower (4) and the fourth distillation tower (6) are connected to a first condenser (7), a second condenser (8) and a third condenser (9) respectively.

10. The high-efficiency and high-purity distillation purification device according to claim 9, characterized in that: The material extracted from the upper part of the fourth distillation tower (6) is cooled by a cooler (13) and then enters a storage tank (14).

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