A distillation column for 1,4-butanediol production

Abstract

The utility model discloses a kind of 1,4-butanediol preparation distillation column, belong to 1,4-butanediol preparation technical field, comprising: preheating shell, preheating shell side is respectively equipped with input and output, preheating shell top surface is inlayed and is equipped with distillation column main part;Stirring assembly, stirring assembly contains connecting ring and several stirring plate, the centripetal side of several stirring plate is welded with connecting ring, connecting ring top surface is inlayed and is slidably connected with the spacing plate of the shape of I-shaped, two limit posts are welded in connecting ring inner ring surface, two limit grooves that the spiral coiling of limit post is moved are set in the outer side wall of distillation column main part, the inner chamber of preheating shell is provided with the connecting pipe of the spiral coiling, connecting pipe two outer circumferential side respectively with distillation column main part, output port intercommunication, the utility model can be sufficient heat exchange to the heat recovered, improve heat recovery effect, reduce energy loss, improve the use environmental protection of distillation column.

Description

Technical Field

[0001] This invention belongs to the field of 1,4-butanediol preparation technology, and in particular to a distillation column for 1,4-butanediol preparation. Background Technology

[0002] The preparation of 1,4-butanediol requires the use of a distillation column to purify crude 1,4-butanediol. Existing distillation columns, in order to recover and reuse heat, have the distillation vapors of the crude 1,4-butanediol contained within a pipe and enveloping the input crude 1,4-butanediol, thus preheating it. However, the crude 1,4-butanediol is prone to uneven heating, reducing the efficiency of heat recovery and reuse, and compromising the environmental friendliness of the distillation column.

[0003] A search of related technologies revealed a Chinese patent document (authorization announcement number CN217367196U) for a novel distillation column for the preparation of 1,4-butanediol. The column includes a distillation column body, an outer jacket, and a heat exchange cavity between the distillation column body and the jacket. A spiral tube is installed inside the heat exchange cavity. The inner ring of the spiral tube is fixedly connected to the outer wall of the distillation column body, and the outer ring of the spiral tube is fixedly connected to the inner wall of the jacket. The top end of the spiral tube is fixedly connected to one end of a connecting pipe, and the other end of the connecting pipe is connected to a gas phase outlet located at the top of the inner cavity of the distillation column body. Multiple longitudinally arranged liquid distributors are installed within the inner cavity of the distillation column body, and all liquid distributors are connected to the heat exchange cavity. This invention provides a novel distillation column for the preparation of 1,4-butanediol, which can exchange heat between the liquid phase material to be distilled and the distilled gas phase material, facilitating subsequent distillation and condensation. It can reduce the waste of steam during the distillation process, which is beneficial for energy conservation and emission reduction. However, the above patent does not consider that crude 1,4-butanediol is prone to uneven heating, which reduces the efficiency of heat recovery and reuse, and reduces the environmental friendliness of the distillation column. Utility Model Content

[0004] The purpose of this invention is to provide a distillation column for the preparation of 1,4-butanediol, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a distillation column for the preparation of 1,4-butanediol, comprising: The preheating shell has an inlet and an outlet installed on its side, and a distillation column body for the preparation of 1,2-butanediol is embedded in the top surface of the preheating shell. The stirring assembly is located inside the preheating shell. The stirring assembly includes a connecting ring and several stirring plates. The stirring plates are welded to the connecting ring on one side facing the center. A slidable limiting plate in the shape of an I-beam is embedded in the top surface of the connecting ring. Two limiting posts are welded to the inner ring surface of the connecting ring. Two spirally coiled limiting grooves are opened on the outer wall of the distillation column body to allow the limiting posts to move. A spirally coiled connecting pipe is provided in the inner cavity of the preheating shell. The two outer circumferences of the connecting pipe are connected to the distillation column body and the outlet, respectively.

[0006] Preferably, there is a gap between one side of the centrifugal stirring plates and the connecting pipe, and a support base is welded to the bottom surface of the main body of the distillation column.

[0007] Preferably, the top surface of the support base is welded to the preheating shell, and the top surface of the limiting plate is connected to the moving end of the electric push rod by bolts.

[0008] Preferably, both electric push rods are installed on the top surface of the preheating shell, and a spray assembly is provided in the inner cavity of the distillation column body.

[0009] Preferably, the spray assembly includes several nozzles and an internally hollow rotating rod, and two sealed bearings are embedded and fixedly connected to the inner wall of the distillation column body.

[0010] Preferably, the inner ring of the sealed bearing is interference-fitted with a rotating column, and the two rotating columns are welded to the rotating rod on adjacent sides.

[0011] Preferably, several nozzles are installed on the side of the rotating rod, and a rigid conduit is embedded and fixedly connected to the end face of one of the rotating columns, with the outer periphery of the conduit communicating with the rotating rod.

[0012] Preferably, the side of the conduit away from the rotating rod is connected to a fixing plate with a concave side. The inner cavity of the fixing plate is welded with several rotationally symmetrically arranged arc-shaped fan blades, and a fixing block is welded to the inward side of the several arc-shaped fan blades.

[0013] Compared with the prior art, the technical effects and advantages of this utility model are as follows: This distillation column for 1,4-butanediol preparation allows crude 1,4-butanediol to be fed into the inner cavity of the column body. After being heated and evaporated, it is fed into the connecting pipe, where heat is exchanged between the connecting pipe and the crude 1,4-butanediol, thus preheating the crude 1,4-butanediol and reducing energy consumption. Thanks to the design of the stirring assembly, power can be provided by an electric push rod, which, with the connection of two limiting plates, allows the vertical position of the connecting ring to move. This causes the two limiting columns to move along the limiting grooves in the main body of the distillation column, enabling the rotation of the connecting ring and, consequently, the rotation of several stirring plates. This allows for stirring of the crude 1,4-butanediol in the preheating shell cavity, resulting in uniform preheating and improving the environmental friendliness of the distillation column. This distillation column for 1,4-butanediol preparation benefits from the design of the spray assembly. An external pump inputs crude 1,4-butanediol into the inner cavity of the preheating shell through the inlet, creating pressure within the preheating shell. This pressure forces the crude 1,4-butanediol through the spray assembly into the inner cavity of the distillation column body, providing the necessary conditions for the distillation of 1,4-butanediol. During the flow of the crude 1,4-butanediol, several arc-shaped fan blades rotate around a fixed block. With the connection of a fixed plate, conduit, and rotating column, several nozzles rotate around a rotating rod, achieving uniform spraying of the crude 1,4-butanediol. This ensures that the crude 1,4-butanediol fully contacts the heat inside the distillation column body, improving the distillation efficiency of the crude 1,4-butanediol. Attached Figure Description

[0014] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a partial structural schematic diagram of the preheating shell of this utility model; Figure 3 This is a schematic diagram of the structure of the stirring assembly of this utility model; Figure 4 This is a partial structural schematic diagram of the main body of the distillation column of this utility model; Figure 5 This is a schematic diagram of the structure of the spray assembly of this utility model; Figure 6 For the present utility model Figure 5 Enlarged view of the structure at point A in the middle.

[0016] Explanation of reference numerals in the attached figures: In the diagram: 1. Preheating shell; 2. Inlet; 3. Outlet; 4. Distillation column body; 5. Stirring assembly; 6. Connecting ring; 7. Stirring plate; 8. Limiting plate; 9. Limiting column; 10. Electric push rod; 11. Connecting pipe; 12. Support base; 13. Fixing block; 14. Spray assembly; 15. Rotating rod; 16. Spray head; 17. Rotating column; 18. Sealed bearing; 19. Conduit; 20. Fixing plate; 21. Arc-shaped fan blade. Detailed Implementation

[0017] In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention can be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described in order to avoid confusion with the present invention.

[0018] Unless otherwise defined, the directions mentioned herein, such as up, down, left, right, front, back, inside, and outside, are based on the directions shown in the figures of this utility model, and are explained here together.

[0019] The connection method can be any existing method, such as bonding, welding, or bolting, depending on the actual needs.

[0020] Please see Figures 1 to 6 A distillation column for the preparation of 1,4-butanediol, in this embodiment comprising: The preheating shell 1 has an inlet 2 and an outlet 3 installed on its side. The top surface of the preheating shell 1 is embedded with a distillation column body 4 for the preparation of 1,4-butanediol. The distillation column body 4 has a built-in reboiler. Saturated steam and material are indirectly heated through the reboiler. The two are physically isolated and do not mix, so as to provide heat for the distillation of crude 1,4-butanediol in the inner cavity of the distillation column body 4. The distillation column body 4 is an existing facility. The appropriate heating method can be selected according to the actual use needs. The specific heating working principle is not the innovative structure to be protected by this utility model and will not be described in detail. The top and bottom surfaces of the distillation column body 4 penetrate the preheating shell 1, so that the preheating shell 1 covers the side of the distillation column body 4. At the same time, the inner cavity formed by the combination of the preheating shell 1 and the adjacent side of the distillation column body 4 is used to preheat the crude 1,4-butanediol, so as to realize the recovery and reuse of heat, reduce energy consumption, and realize the environmental protection of the distillation column. During use, the crude 1,4-butanediol in the preheating shell 1 is prone to uneven heat exchange, which reduces the heat recovery effect and the environmental friendliness of the distillation column. Thanks to the design of the stirring component 5, the crude 1,4-butanediol in the preheating shell 1 can be stirred to achieve uniform heat exchange of 1,4-butanediol, enhance the heat recovery effect, and improve the environmental friendliness of the distillation column. The stirring component 5 is set in the inner cavity of the preheating shell 1 and includes a connecting ring 6 and several stirring plates 7. The stirring plates 7 are welded to the connecting ring 6 on one side facing the center. The top surface of the connecting ring 6 is embedded with a sliding limit plate 8 in the shape of an I.

[0021] The top surface of the connecting ring 6 has a T-shaped sliding groove, which allows the limiting plate 8 to slide along the sliding groove of the connecting ring 6. Two limiting posts 9 are welded to the inner ring surface of the connecting ring 6. Two spirally coiled limiting grooves are provided on the outer wall of the distillation column body 4 for the limiting posts 9 to move. The vertical spiral coiling of the limiting grooves is relatively steep. The inner cavity of the preheating shell 1 is provided with a spirally coiled connecting pipe 11. The two outer circumferences of the connecting pipe 11 are connected to the distillation column body 4 and the output port 3, respectively. The moving end of the electric push rod 10 is connected to the top surface of the limiting plate 8 by bolts. Both electric push rods 10 are installed on the top surface of the preheating shell 1. The fixed ends of the two electric push rods 10 are connected to the preheating shell 1 by bolts.

[0022] Two electric push rods 10 provide power, and with the connection of two limiting plates 8, the connecting ring 6 can move vertically. At the same time, two limiting columns 9 move along two limiting grooves on the surface of the distillation column body 4. Since the limiting grooves are spirally coiled, the connecting ring 6 can rotate during vertical movement, thereby rotating several stirring plates 7. The rotation of the stirring plates 7 during vertical movement stirs the crude 1,4-butanediol in the inner cavity of the preheating shell 1, achieving full and uniform preheating of the crude 1,4-butanediol, improving heat recovery, reducing energy consumption, and improving the environmental friendliness of the distillation column. The spiral coiling of the limiting grooves is determined according to actual usage requirements to prevent the spiral coiling slope of the limiting grooves from being too gentle, resulting in greater vertical resistance, which would be detrimental to the vertical movement of the connecting ring 6, and improve the structural stability of the distillation column components.

[0023] A gap exists between one side of the stirring plates 7 and the connecting pipe 11 to prevent the stirring plates 7 from scraping against the connecting pipe 11 located in the inner cavity of the preheating shell 1. A support base 12 is welded to the bottom surface of the distillation column body 4, and the top surface of the support base 12 is welded to the preheating shell 1. A spray assembly 14 is provided in the inner cavity of the distillation column body 4. Thanks to the design of the spray assembly 14, the crude 1,4-butanediol product input into the inner cavity of the distillation column body 4 can be sprayed evenly, which facilitates heat exchange, improves the distillation effect of crude 1,4-butanediol product, and thus improves the preparation efficiency of 1,4-butanediol.

[0024] The spray assembly 14 includes several nozzles 16 and a hollow rotating rod 15. Two sealed bearings 18 are embedded and fixedly connected to the inner wall of the distillation column body 4. The inner ring of the sealed bearing 18 is interference-fitted with a rotating column 17. The two rotating columns 17 are welded to the rotating rod 15 on adjacent sides. Several nozzles 16 are installed on the side of the rotating rod 15. A rigid conduit 19 is embedded and fixedly connected to the end face of one of the rotating columns 17. The outer periphery of the conduit 19 is connected to the rotating rod 15. The side of the conduit 19 away from the rotating rod 15 is connected to a fixed plate 20 with a concave side. Several rotationally symmetrically arranged arc-shaped fan blades 21 are welded to the inner cavity of the fixed plate 20. A fixed block 13 is welded to the inward side of the arc-shaped fan blades 21.

[0025] When the external pump body inputs crude 1,4-butanediol into the inner cavity of the preheating shell 1 through inlet 2, the pressure inside the preheating shell 1 increases. Under the action of gas pressure, the crude 1,4-butanediol is input into the inner cavity of the distillation column body 4 through the spray assembly 14 for distillation. The crude 1,4-butanediol vapor flows out through the connecting pipe 11 and outlet 3, and after condensation, forms the finished 1,4-butanediol. The crude 1,4-butanediol drives several arc-shaped fan blades 21 to rotate around the fixed block 13 as the axis. With the connection of the fixed plate 20, the conduit 19, and the rotating column 17, several nozzles 16 rotate around the rotating rod 15 as the axis, uniformly spraying crude 1,4-butanediol into the inner cavity of the main body 4 of the distillation column. This allows the crude 1,4-butanediol to undergo rapid heat exchange and evaporation, improving the distillation column's efficiency in preparing 1,4-butanediol. When the stirring component 5 moves to the top, sufficient space is reserved between the stirring component 5 and the spraying component 14 to prevent the stirring component 5 from rubbing against the spraying component 14, thus improving the structural stability of the distillation column's components.

[0026] Both electric actuators 10 are waterproof, corrosion-resistant, and high-temperature resistant to cope with the operating environment of the electric actuators 10.

[0027] The electric actuator 10 is a conventional instrument. Its working principle, size, and model are irrelevant to the function of this application, so they will not be described in detail. The control method of this utility model is through a controller. The control circuit of the controller can be implemented by a person skilled in the art through simple programming. In order to facilitate the inspection, maintenance, and parts replacement of the device, the parts inside a single device are usually from the same manufacturer and of the same model, function, and batch. Therefore, even if there is a certain difference between two or more electrical control devices, the synchronous movement of the electrical control devices can still be maintained under the action of the controller. The power supply is also common knowledge in the field. Furthermore, this utility model is mainly used to protect mechanical devices, so the control method and circuit connection will not be explained in detail in this utility model. All standard parts used in this utility model can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, welding, and bonding that are mature in the existing technology. The machinery, parts and equipment all adopt conventional models in the existing technology.

[0028] Working principle In use, the external pump body of the 1,4-butanediol preparation distillation column inputs crude 1,4-butanediol into the inner cavity of the preheated shell 1 through the inlet 2. Under the action of air pressure, it drives several arc-shaped fan blades 21 to rotate around the fixed block 13. With the connection of the fixed plate 20, the conduit 19, and the rotating column 17, several nozzles 16 rotate around the rotating rod 15 to uniformly spray crude 1,4-butanediol into the inner cavity of the distillation column body 4. The distillation vapor of crude 1,4-butanediol flows into the inner cavity of the connecting pipe 11. The connecting pipe 11 is coiled around the inner cavity of the preheating shell 1 to achieve heat exchange between the vapor and the crude 1,4-butanediol, thereby preheating the crude 1,4-butanediol. Two electric push rods 10 are activated, and with the connection of two limiting plates 8, the connecting ring 6 moves vertically. At the same time, two limiting posts 9 move along the limiting groove, realizing the rotation of the connecting ring 6. This causes several stirring plates 7 to rotate during the vertical movement, stirring the crude 1,4-butanediol and enhancing the heat exchange effect.

[0029] It should be noted that, in this document, relational terms such as "one" and "two" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, the phrase "comprising an element defined as..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0030] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A distillation column for the preparation of 1,4-butanediol, characterized in that, include: The preheating shell (1) has an inlet (2) and an outlet (3) installed on its side. The top surface of the preheating shell (1) is inlaid with a distillation column body (4) for the preparation of 1,4-butanediol. A stirring assembly (5) is disposed in the inner cavity of the preheating shell (1). The stirring assembly (5) includes a connecting ring (6) and several stirring plates (7). The centripetal side of several stirring plates (7) is connected to the connecting ring (6). The top surface of the connecting ring (6) is connected to a limiting plate (8) in the shape of an I-beam. Two limiting posts (9) are provided on the inner ring surface of the connecting ring (6). Two spirally coiled limiting grooves are opened on the outer wall of the distillation column body (4) for the limiting posts (9) to move. A spirally coiled connecting pipe (11) is provided in the inner cavity of the preheating shell (1). The two outer peripheral sides of the connecting pipe (11) are respectively connected to the distillation column body (4) and the outlet (3).

2. The distillation column for the preparation of 1,4-butanediol according to claim 1, characterized in that: There is a gap between the centrifugal side of several of the stirring plates (7) and the connecting pipe (11), and the bottom surface of the distillation column body (4) is connected to a support base (12).

3. A distillation column for the preparation of 1,4-butanediol according to claim 2, characterized in that: The top surface of the support base (12) is connected to the preheating shell (1), and the top surface of the limiting plate (8) is connected to the moving end of the electric push rod (10).

4. A distillation column for the preparation of 1,4-butanediol according to claim 3, characterized in that: Both electric push rods (10) are installed on the top surface of the preheating shell (1), and the inner cavity of the distillation column body (4) is provided with a spray assembly (14).

5. A distillation column for the preparation of 1,4-butanediol according to claim 4, characterized in that: The spray assembly (14) includes several nozzles (16) and a hollow rotating rod (15), and two sealed bearings (18) are connected to the inner wall of the distillation column body (4).

6. A distillation column for the preparation of 1,4-butanediol according to claim 5, characterized in that: The inner ring of the sealed bearing (18) is provided with a rotating column (17), and the two rotating columns (17) are connected to the rotating rod (15) on adjacent sides.

7. A distillation column for the preparation of 1,4-butanediol according to claim 6, characterized in that: Several nozzles (16) are mounted on the side of the rotating rod (15), and one of the rotating columns (17) has a hard conduit (19) connected to its end face, the outer periphery of which is connected to the rotating rod (15).

8. A distillation column for the preparation of 1,4-butanediol according to claim 7, characterized in that: The side of the conduit (19) away from the rotating rod (15) is connected to a fixed plate (20) with a concave side. The inner cavity of the fixed plate (20) is connected to a number of rotationally symmetrically arranged arc-shaped fan blades (21). A fixed block (13) is provided on the centripetal side of the number of arc-shaped fan blades (21).

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