A short-path dispensing structure

Abstract

This utility model relates to a discharge structure for a short-path distiller. It solves the technical problems of existing traditional short-path distillers where the limited inclination of the high-boiling-point outlet fails to meet the discharge requirements of high-boiling-point materials. The structure includes a distiller shell with a feed inlet at the top, an internal condenser and a scraper assembly, a heating assembly on the outer periphery of the distiller shell, a condenser tube box on the inner side of the distiller shell, and a conical discharge cylinder at the lower end of the distiller shell. A high-boiling-point region is formed between the outer periphery of the condenser tube box and the interior of the conical discharge cylinder. A high-boiling-point outlet is located at the bottom of the conical discharge cylinder, and a low-boiling-point region is formed at the internal condenser. The low-boiling-point region is connected to the low-boiling-point outlet via a low-boiling-point guide pipe. The advantages are: the conical discharge cylinder design guides high-boiling-point materials to slide rapidly down the guide cone surface, reducing dead zones, and gravity-assisted discharge prevents high-boiling-point material from accumulating.

Description

Technical Field

[0001] This utility model belongs to the technical field of dispensing equipment for distillers, and specifically relates to a dispensing structure for a short-path distiller. Background Technology

[0002] A short-path distiller is a high-vacuum separation device widely used in applications requiring the separation of high-boiling-point materials under atmospheric pressure and where high residue requirements for low-boiling-point substances are necessary. The discharge structure of a traditional short-path distiller in existing technology is generally as follows: Figure 1 As shown, due to the limitation of the built-in condenser 4, the high-boiling point outlet 51 can only be set on the side of the equipment. At the same time, in order to quickly discharge the material in the high-boiling point area 5, the high-boiling point outlet 51 is designed to be inclined downward. This inclined discharge design improves the flow of material in the high-boiling point area 5. However, with the rapid development of new chemical materials, various polymer materials have emerged one after another, and the viscosity range has greatly exceeded the previous understanding. The larger the molecular weight, the higher the viscosity. However, the inclination of the high-boiling point outlet of the traditional short-path distillation unit is limited, so it cannot meet the discharge requirements of high-boiling point materials. Summary of the Invention

[0003] The purpose of this invention is to address the above-mentioned problems by providing a short-path dispensing structure for a distillation apparatus.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a short-path dispensing structure, comprising a dispensing shell with a feed inlet at the upper end, an internal condenser and a scraper assembly located circumferentially outside the internal condenser, a heating assembly located circumferentially outside the scraper assembly, a condenser tube box connected to the lower end of the internal condenser on the inner side of the dispensing shell, a conical dispensing cylinder located below the condenser tube box at the lower end of the dispensing shell, a high-boiling-point region formed between the circumferentially outside the condenser tube box and the interior of the conical dispensing cylinder, and a high-boiling-point outlet connected to the high-boiling-point region at the bottom of the conical dispensing cylinder, a low-boiling-point region formed at the internal condenser, and the low-boiling-point region connected to the low-boiling-point outlet located outside the conical dispensing cylinder via a bent low-boiling-point guide pipe penetrating the condenser tube box. The conical discharge cylinder design utilizes gravity to accelerate the settling of high-boiling-point substances, and the concentrated discharge at the bottom facilitates continuous production and reduces residue. The low-boiling-point substance guide pipe adopts a bent design to ensure that low-boiling-point substances are discharged independently, reducing contact with high-boiling-point substances.

[0005] In the above-mentioned short-range dispensing structure of a distiller, the condenser tube box is located on the inner side of the middle or lower part of the distiller shell, and the condenser tube box is connected to the cooling water inlet and cooling water outlet located on the outer side of the conical dispensing cylinder.

[0006] In the aforementioned short-path dispensing structure of a still, the still shell includes a straight cylindrical section that is closed at the top and open at the bottom. The feed inlet is located at the upper end of the straight cylindrical section, and the conical discharge cylinder is coaxially connected to the lower end of the straight cylindrical section. The coaxial connection between the straight cylindrical section and the conical discharge cylinder facilitates manufacturing and assembly. The straight cylindrical section provides a stable evaporation space, while the conical discharge cylinder focuses on dispensing and separation.

[0007] In the aforementioned short-path dispensing structure of a distillation apparatus, the upper diameter of the conical dispensing cylinder is equal to the diameter of the straight cylinder. The diameter of the conical dispensing cylinder gradually decreases from the upper to the lower end, and a guide cone surface is formed on the inner circumferential side of the conical dispensing cylinder. The equal diameter of the upper end of the conical dispensing cylinder and the straight cylinder ensures a smooth fluid transition, while the reduced diameter at the lower end concentrates the dispensing flow, conforming to fluid mechanics principles, reducing flow resistance, and the inner conical surface guides high-boiling substances to the bottom, avoiding dead zones.

[0008] In the above-mentioned short-path dispensing structure of a distiller, the length of the straight cylinder section is greater than the length of the conical dispensing cylinder section, the condenser tube box is located on the inner circumferential side of the end of the straight cylinder section near the conical dispensing cylinder section, and the high-boiling-point region is formed between the inner circumferential side of the end of the straight cylinder section near the conical dispensing cylinder section and the inner circumferential side of the guide cone surface.

[0009] In the above-mentioned short-path dispensing structure of a distillation apparatus, the built-in condenser is vertically arranged in the center of the straight cylinder section and has a cooling pipe connected to the condenser tube box.

[0010] In the aforementioned short-path dispensing structure of a distiller, the low-boiling-point guide pipe includes a first vertical pipe that vertically penetrates the condenser tube box. The upper end of the first vertical pipe is connected to the low-boiling-point region via a conical low-boiling-point guide section. The lower end of the first vertical pipe is connected to the upper end of a second vertical pipe via an inclined pipe, and the lower end of the second vertical pipe extends outward from the conical discharge cylinder to form a low-boiling-point outlet. The pipeline penetrates the condenser tube box but is independent of the high-boiling-point region to prevent mixing of different components.

[0011] In the aforementioned short-path dispensing structure of a distillation unit, the scraping assembly includes a rotor scraper rotatably mounted on the inner circumferential side of the straight cylinder section. The upper end of the rotor scraper is connected via a rotating shaft to a stirring drive device located on the outer side of the upper end of the straight cylinder section. This prevents high-boiling-point substances from coking or accumulating on the evaporation surface, thus extending the equipment's operating cycle.

[0012] In the aforementioned short-path dispensing structure of a distillation unit, the heating assembly includes a heating jacket disposed circumferentially outside the straight cylindrical section. The straight cylindrical section has a mixing region corresponding to the heating jacket on its circumferentially inner side. The heating jacket has a heat transfer oil inlet on its lower side and a heat transfer oil outlet on its upper side. The heating jacket surrounds the straight cylindrical section, providing uniform radial heat flow and preventing localized overheating. The heat transfer oil inlet and outlet facilitate precise temperature control, making it suitable for heat-sensitive materials.

[0013] In the above-mentioned short-path dispensing structure of a distiller, a vacuum port corresponding to the high-boiling-point region is provided on the outer side of the straight cylinder near the conical dispensing cylinder.

[0014] Compared with existing technologies, the advantages of this utility model are:

[0015] 1. This device utilizes the design structure of the conical discharge cylinder to guide high-boiling substances to slide down rapidly along the guide cone surface, reducing dead angles. At the same time, gravity-assisted discharge prevents high-boiling substances from accumulating.

[0016] 2. This device isolates materials in high-boiling-point and low-boiling-point regions, preventing mixing of high and low boiling-point substances. It is especially suitable for separating heat-sensitive materials and reducing component degradation at high temperatures.

[0017] 3. The heating jacket, built-in condenser, and rotor scraper of this device are all installed independently, making maintenance convenient. At the same time, the conical discharge cylinder and the straight cylinder are coaxially connected to ensure the stability of the equipment during operation and reduce vibration and noise. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the discharge structure of a short-path distillation apparatus in the prior art.

[0019] Figure 2 This is a schematic diagram of the structure of this utility model.

[0020] In the diagram: 1. Distillation apparatus shell, 11. Feed inlet, 12. Conical discharge cylinder, 13. Straight cylinder, 14. Guide cone, 15. Vacuum port, 2. Scraper assembly, 21. Rotor scraper, 22. Shaft, 23. Stirring drive, 3. Heating assembly, 31. Heating jacket, 32. Heat transfer oil inlet, 33. Heat transfer oil outlet, 4. Built-in condenser, 41. Condenser tube box, 42. Cooling water inlet, 43. Cooling water outlet, 5. High boiling point zone, 51. High boiling point outlet, 6. Low boiling point zone, 61. Low boiling point guide pipe, 62. Low boiling point outlet, 63. First vertical pipe, 64. Conical low boiling point guide section, 65. Inclined pipe, 66. Second vertical pipe, 7. Mixture zone. Detailed Implementation

[0021] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0022] like Figure 2 As shown, a short-path dispensing structure includes a dispensing shell 1 with a feed inlet 11 at the upper end. Inside the dispensing shell 1 is a built-in condenser 4 and a scraper assembly 2 located circumferentially outside the built-in condenser 4. A heating assembly 3 is located circumferentially outside the scraper assembly 2. Inside the dispensing shell 1 is a condenser tube box 41 connected to the lower end of the built-in condenser 4. At the lower end of the dispensing shell 1 is a conical discharge cylinder 12 located below the condenser tube box 41. A high-boiling-point region 5 is formed between the circumferentially outside the condenser tube box 41 and the interior of the conical discharge cylinder 12. The bottom of the conical discharge cylinder 12 has a high-boiling-point outlet 51 connected to the high-boiling-point region 5. A low-boiling-point region 6 is formed at the built-in condenser 4. The low-boiling-point region 6 is connected to a low-boiling-point outlet 62 located outside the conical discharge cylinder 12 via a bent low-boiling-point guide pipe 61 that penetrates the condenser tube box 41. The conical discharge cylinder 12 is designed to accelerate the settling of high-boiling-point substances by gravity. The concentrated discharge at the bottom facilitates continuous production and reduces residue. The low-boiling-point substance guide pipe 61 adopts a bent design to ensure that low-boiling-point substances are discharged independently and reduce contact with high-boiling-point substances.

[0023] The condenser tube box 41 is located on the inner side of the middle or lower part of the still shell 1, and the condenser tube box 41 is connected to the cooling water inlet 42 and the cooling water outlet 43 located on the outer side of the conical discharge cylinder 12.

[0024] Specifically, the still shell 1 includes a straight cylindrical section 13 that is closed at the top and open at the bottom. The feed inlet 11 is located at the upper end of the straight cylindrical section 13, and the conical discharge cylinder section 12 is coaxially connected to the lower end of the straight cylindrical section 13. The coaxial connection between the straight cylindrical section 13 and the conical discharge cylinder section 12 facilitates processing, manufacturing, and assembly. The straight cylindrical section 13 provides a stable evaporation space, while the conical discharge cylinder section 12 focuses on discharge and separation.

[0025] Clearly, the upper diameter of the conical discharge cylinder 12 is equal to the diameter of the straight cylinder 13, and the diameter of the conical discharge cylinder 12 gradually decreases from the upper end to the lower end. Furthermore, a guide cone surface 14 is formed on the inner circumference of the conical discharge cylinder 12. The equal diameter at the upper end of the conical discharge cylinder 12 and the straight cylinder ensure a smooth fluid transition, while the reduced diameter at the lower end concentrates the discharge, conforming to fluid mechanics principles, reducing flow resistance. The inner conical surface guides high-boiling substances to the bottom, avoiding stagnation dead zones.

[0026] Meanwhile, the length of the straight cylinder 13 is greater than the length of the conical discharge cylinder 12. The condenser tube box 41 is located on the inner side of the straight cylinder 13 near the conical discharge cylinder 12, and the high boiling point region 5 is formed between the inner side of the straight cylinder 13 near the conical discharge cylinder 12 and the inner side of the guide cone surface 14.

[0027] Furthermore, the built-in condenser 4 is vertically disposed at the center of the inside of the straight cylindrical portion 13 and has a cooling pipe connected to the condenser tube box 41.

[0028] Furthermore, the low-boiling-point guide pipe 61 includes a first vertical pipe 63 that vertically penetrates the condenser tube box 41. The upper end of the first vertical pipe 63 is connected to the low-boiling-point region 6 via a conical low-boiling-point guide section 64. The lower end of the first vertical pipe 63 is connected to the upper end of a second vertical pipe 66 via an inclined pipe 65. The lower end of the second vertical pipe 66 extends outward from the conical discharge cylinder section 12 to form a low-boiling-point outlet 62. The pipeline penetrates the condenser tube box 41 but is independent of the high-boiling-point region 5 to prevent mixing of different components.

[0029] Specifically, the film scraping assembly 2 includes a rotor film scraper 21 rotatably disposed on the inner side of the straight cylinder 13. The upper end of the rotor film scraper 21 is connected to a stirring drive device 23 disposed on the outer side of the upper end of the straight cylinder 13 via a rotating shaft 22. This prevents high-boiling-point substances from coking or accumulating on the evaporation surface, thus extending the equipment's operating cycle.

[0030] Specifically, the heating assembly 3 includes a heating jacket 31 disposed around the outer periphery of the cylindrical portion 13, and a mixing region 7 corresponding to the heating jacket 31 disposed around the inner periphery of the cylindrical portion 13. The heating jacket 31 has a heat transfer oil inlet 32 ​​on its lower side and a heat transfer oil outlet 33 on its upper side. The heating jacket 31 surrounds the cylindrical portion, providing uniform radial heat flow and avoiding local overheating. The heat transfer oil inlet 32 ​​and the heat transfer oil outlet 33 facilitate precise temperature control, making it suitable for heat-sensitive materials.

[0031] In addition, a vacuum port 15 corresponding to the high boiling point region 5 is provided on the outer side of the straight cylinder section 13 near the conical discharge cylinder section 12.

[0032] The principle of this embodiment is as follows:

[0033] The stirring drive device 23 drives the rotor scraper 21 to rotate at high speed via the rotating shaft 22, uniformly coating the mixture onto the inner wall of the straight cylinder 13 to form a liquid film of uniform thickness. The heating jacket 31 introduces high-temperature heat transfer oil through the heat transfer oil inlet 32 ​​and outlet 33, uniformly heating the mixture inside the straight cylinder 13. Low-boiling-point components preferentially evaporate, forming vapor molecules that move towards the built-in condenser 4. The internal cooling pipes of the built-in condenser 4 are connected to the condenser tube box 41, and low-temperature cooling water is introduced through the cooling water inlet 42 and cooling water outlet 43, forming a low-temperature condensation surface. The low-boiling-point vapor molecules generated have a short mean free path and can quickly reach the surface of the built-in condenser 4, condense into a liquid state, and form a low-boiling-point region 6. The high-boiling-point components, due to their low evaporation rate, remain in liquid form and adhere to the liquid film, flowing downwards along the inner wall of the straight cylinder 13. The unevaporated high-boiling-point components flow into the conical discharge cylinder 12 along the inner wall of the straight cylinder 13, and converge towards the bottom under the action of the guide cone surface 14 to form a high-boiling-point region 5, and then are discharged through the high-boiling-point outlet 51. The condensed low-boiling-point components converge at the bottom of the built-in condenser 4 and are discharged through the bent low-boiling-point guide pipe 61.

[0034] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

[0035] Although this document frequently uses terms such as still shell 1, feed inlet 11, conical discharge cylinder 12, straight cylinder 13, guide cone 14, vacuum port 15, scraper assembly 2, rotor scraper 21, rotating shaft 22, stirring drive device 23, heating assembly 3, heating jacket 31, heat transfer oil inlet 32, heat transfer oil outlet 33, built-in condenser 4, condenser tube box 41, cooling water inlet 42, cooling water outlet 43, high-boiling-point zone 5, high-boiling-point outlet 51, low-boiling-point zone 6, low-boiling-point guide pipe 61, low-boiling-point outlet 62, first vertical pipe 63, conical low-boiling-point guide section 64, inclined pipe 65, second vertical pipe 66, and mixture zone 7, the possibility of using other terms is not excluded. The use of these terms is merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any additional limitation would contradict the spirit of this utility model.

Claims

1. A short-path dispensing structure for a distiller, comprising a distiller shell (1) with a feed inlet (11) at its upper end, wherein the distiller shell (1) is provided with an internal condenser (4) and a scraper assembly (2) located circumferentially outside the internal condenser (4), and wherein a heating assembly (3) is provided circumferentially outside the scraper assembly (2), characterized in that, The inner side of the still shell (1) is provided with a condenser tube box (41) connected to the lower end of the built-in condenser (4). The lower end of the still shell (1) has a conical discharge cylinder (12) that is conical and located below the condenser tube box (41). A high-boiling area (5) is formed between the outer circumferential side of the condenser tube box (41) and the inside of the conical discharge cylinder (12). The bottom of the conical discharge cylinder (12) has a high-boiling outlet (51) that is connected to the high-boiling area (5). A low-boiling area (6) is formed at the built-in condenser (4). The low-boiling area (6) is connected to the low-boiling outlet (62) located outside the conical discharge cylinder (12) through a bent low-boiling guide pipe (61) that runs through the condenser tube box (41).

2. The discharge structure of a short-path distillation apparatus according to claim 1, characterized in that, The condenser tube box (41) is located on the inner side of the middle or lower part of the still shell (1), and the condenser tube box (41) is connected to the cooling water inlet (42) and cooling water outlet (43) located on the outer side of the conical discharge cylinder (12).

3. The discharge structure of a short-path distillation apparatus according to claim 1 or 2, characterized in that, The distiller shell (1) includes a straight cylindrical section (13) that is closed at the top and open at the bottom. The feed inlet (11) is located at the upper end of the straight cylindrical section (13), and the conical discharge cylinder section (12) is coaxially connected to the lower end of the straight cylindrical section (13).

4. The discharge structure of a short-path distillation apparatus according to claim 3, characterized in that, The upper diameter of the conical discharge cylinder (12) is equal to the diameter of the straight cylinder (13). The upper diameter of the conical discharge cylinder (12) gradually decreases from the lower diameter to the upper diameter. A guide cone surface (14) is formed on the inner circumferential side of the conical discharge cylinder (12).

5. The discharge structure of a short-path distillation apparatus according to claim 4, characterized in that, The length of the straight cylinder section (13) is greater than the length of the conical discharge cylinder section (12). The condenser tube box (41) is located on the inner side of the straight cylinder section (13) near the conical discharge cylinder section (12). The high-boiling-point region (5) is formed between the inner side of the straight cylinder section (13) near the conical discharge cylinder section (12) and the inner side of the guide cone surface (14).

6. The discharge structure of a short-path distillation apparatus according to claim 3, characterized in that, The built-in condenser (4) is vertically disposed in the center of the straight cylindrical part (13) and the built-in condenser (4) has a cooling pipe connected to the condenser tube box (41).

7. The discharge structure of a short-path distillation apparatus according to claim 3, characterized in that, The low-boiling-point guide pipe (61) includes a first vertical pipe (63) that vertically penetrates the condenser tube box (41). The upper end of the first vertical pipe (63) is connected to the low-boiling-point region (6) through a conical low-boiling-point guide section (64). The lower end of the first vertical pipe (63) is connected to the upper end of a second vertical pipe (66) through an inclined pipe (65). The lower end of the second vertical pipe (66) extends out of the conical discharge cylinder section (12) and forms a low-boiling-point outlet (62) on the outer circumference.

8. The discharge structure of a short-path distillation apparatus according to claim 3, characterized in that, The scraping assembly (2) includes a rotor scraper (21) rotatably disposed on the inner side of the straight cylinder (13). The upper end of the rotor scraper (21) is connected to a stirring drive device (23) disposed on the outer side of the upper end of the straight cylinder (13) via a rotating shaft (22).

9. The discharge structure of a short-path distillation apparatus according to claim 3, characterized in that, The heating assembly (3) includes a heating jacket (31) disposed on the outer side of the straight cylindrical part (13) in the circumferential direction. The inner side of the straight cylindrical part (13) has a mixture region (7) corresponding to the heating jacket (31). The heating jacket (31) has a heat transfer oil inlet (32) on one side of its lower end and a heat transfer oil outlet (33) on one side of its upper end.

10. The discharge structure of a short-path distillation apparatus according to claim 3, characterized in that, The straight cylindrical section (13) has a vacuum port (15) on the outer side of one end near the conical discharge cylinder section (12) that corresponds to the high boiling point region (5).

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