Continuous rectification and recovery device for dipropylene glycol
By designing a dipropylene glycol continuous distillation recovery device including a distillation kettle and a condenser, the pressure change is driven by the change of steam volume and the channel state between the heating chamber and the gas chamber is switched, and the problem of uncontrollable steam flow/flow rate during the distillation of dipropylene glycol is solved, and the stability of the condensation process is achieved.
Patent Information
- Application Number
- CN202420920210.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-29
- Publication Date
- 2025-03-18
- Estimated Expiration
- 2034-04-29
AI Technical Summary
During the distillation of dipropylene glycol, the flow rate/flow rate of the mixed steam is uncontrollable, and there may be a flow interruption problem, which affects the stability of the condensation process and leads to excessive or insufficient condensation capacity.
A dipropylene glycol continuous distillation recovery device is designed, including a distillation kettle and a condenser. The L-shaped partition plate and U-shaped tube are installed inside the distillation kettle. Through the cooperation of the Y-shaped blade and the coil spring, the pressure change is driven by the change of steam volume, the channel state between the heating chamber and the gas chamber is switched, the steam discharge is controlled, and the condensation process is ensured.
The independence of the steam discharge process is achieved, the influence of the steam generation amount on the condensation process is avoided, the stability of the condensation capacity is ensured, and the problem of excessive or insufficient condensation capacity is avoided.
Smart Images
Figure CN222623678U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of dipropylene glycol distillation, in particular to a dipropylene glycol continuous distillation recovery device. Background Art
[0002] Dipropylene glycol is prepared with propylene and water as main raw materials and catalyst and solvent as auxiliary materials under certain pressure and temperature environment to obtain a mixed liquid, which is purified and concentrated by purification process (distillation).
[0003] As for the principle of distillation, the difference in boiling point temperature of different substances is used to vaporize the corresponding components, and then the condensation principle is used to make the vaporized components form liquid to achieve the purpose of purification. Especially for the distillation temperature of dipropylene glycol, it ranges from 185 to 189°C. However, it should be noted that the relevant parameters (flow rate / flow velocity) of the mixed steam generated during the distillation process are uncontrollable, and there may even be a problem of mixed steam interruption, which in turn affects the stability of the subsequent condensation process, specifically the problem of excess or insufficient condensation capacity. This application proposes a solution to this problem. Utility Model Content
[0004] The purpose of the utility model is to provide a dipropylene glycol continuous distillation recovery device, which is aimed at the problem that it is difficult to control the flow rate / flow velocity of mixed steam in the current distillation process of dipropylene glycol, resulting in the problem of flow interruption during the mixed distillation flow process, which directly affects the stability of the subsequent condensation process.
[0005] The purpose of the utility model can be achieved by the following technical scheme: a dipropylene glycol continuous distillation recovery device, comprising a distillation kettle and a condenser, the gas outlet end of the distillation kettle is connected with the gas inlet end of the condenser, and an L-shaped partition is installed inside the distillation kettle, a heating chamber and a gas chamber are arranged inside the distillation kettle through the L-shaped partition, and a U-shaped tube is installed on the outer surface of the upper end of the distillation kettle;
[0006] A connecting gas cylinder is installed at a position corresponding to the gas outlet end inside the distillation kettle, the upper end of the connecting gas cylinder is connected to the gas outlet end of the distillation kettle, and a blocking ball and a lower sliding block are respectively arranged inside the connecting gas cylinder along the direction from top to bottom, a connecting gas column is fixedly installed between the blocking ball and the lower sliding block, and a directional sleeve block is installed on the inner wall position of the connecting gas cylinder corresponding to the blocking ball.
[0007] It is further configured as follows: the two ends of the U-shaped tube are respectively connected to the heating chamber and the gas chamber, and a Y-shaped blade is rotatably installed at the upper end of the U-shaped tube, a mounting sleeve is installed at the outer position of the U-shaped tube, the output shaft of the Y-shaped blade extends to the inside of the mounting sleeve, and a coiled spring is installed on the output shaft of the Y-shaped blade, and one end of the coiled spring is installed in the mounting sleeve.
[0008] It is further configured as follows: the lower end of the connecting gas cylinder passes through the L-shaped partition and extends to the bottom end of the inner wall of the heating layer, and a first gas port is opened on the connecting gas cylinder, and the setting position of the first gas port is higher than the L-shaped partition.
[0009] It is further configured as follows: a connecting spring is installed at the lower end of the lower slider, the lower end of the connecting spring is installed on the bottom end of the connecting air cylinder, the connecting air column is hollow at the upper side position corresponding to the lower slider, and a floating block is slidably installed on the connecting air column.
[0010] It is further configured as follows: the cross section of the blocking ball is in a vertical elliptical shape, the cross section of the floating blocking block is in an upwardly curved arc shape, and a second air port is provided on the connecting air column.
[0011] The utility model has the following beneficial effects:
[0012] 1. The overall device is based on the distillation process of dipropylene glycol. First, the heating chamber and the gas chamber are separated in the distillation kettle. The two do not interfere with each other. Only according to the pressure change caused by the steam volume, the closed or connected state of the only channel between the heating chamber and the gas chamber is switched. Specifically, the elastic potential energy of the coiled spring can be used, and the structural shape of the Y-shaped blade is limited to prevent the high-temperature steam in the gas chamber from blowing back into the heating chamber. The steam generation process and the steam discharge process in the overall distillation process exist independently of each other and do not interfere with each other. Then it can be understood that: the steam discharge process will not be affected by the distillation action of the dipropylene glycol mixed liquid;
[0013] 2. In the process of steam discharge, combined with the four parameters of distillation temperature, steam volume, steam pressure and spring force in the distillation process, its essence is to change the process of steam discharge into the condensing kettle according to the pressure change generated when the steam volume changes. Specifically, in the process of continuous change of steam volume, including the one-way gas outlet process of the second gas port, the two-way gas outlet process of the second gas port with directional sleeve and blocking ball, and the one-way gas outlet process of directional sleeve and blocking ball, its essence is: by increasing the steam discharge "area" to limit the steam discharge flow rate, on the basis of maintaining the continuous condensation action, it is not affected by the amount of steam generated. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] 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 work.
[0015] Figure 1This is a schematic diagram of the structure of a dipropylene glycol continuous distillation recovery device proposed by the utility model;
[0016] Figure 2 It is a cross-sectional view of a distillation kettle in a dipropylene glycol continuous distillation recovery device proposed by the utility model;
[0017] Figure 3 A dipropylene glycol continuous distillation recovery device proposed in the utility model Figure 1 A cross-sectional view of
[0018] Figure 4 This is a schematic diagram of the structure of a Y-shaped blade in a dipropylene glycol continuous distillation recovery device proposed by the utility model;
[0019] Figure 5 The utility model discloses a cross-sectional view of a connecting gas cylinder in a dipropylene glycol continuous distillation recovery device.
[0020] In the figure: 1. distillation kettle; 2. condensation kettle; 3. U-shaped tube; 4. L-shaped partition; 5. Y-shaped blade; 6. connecting gas cylinder; 7. blocking ball; 8. connecting gas column; 9. lower slider; 10. connecting spring; 11. mounting sleeve; 12. coil spring sheet; 13. directional sleeve block; 14. first gas port; 15. second gas port; 16. floating blocking block. DETAILED DESCRIPTION
[0021] The technical solution of the utility model will be described clearly and completely in conjunction with the embodiments below. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of 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.
[0022] Embodiment 1
[0023] For the distillation process of dipropylene glycol, the relevant parameters (flow rate / flow velocity) of the mixed steam generated during the distillation process are uncontrollable, and there may even be a problem of mixed steam interruption, which in turn affects the stability of the subsequent condensation process, specifically the problem of excess or insufficient condensation capacity. The following technical solutions are proposed:
[0024] Reference Figures 1 to 5 In this embodiment, a dipropylene glycol continuous distillation recovery device comprises a still 1 and a condenser 2, wherein the gas outlet end of the still 1 is connected to the gas inlet end of the condenser 2, and an L-shaped partition 4 is installed inside the still 1, a heating bin and a gas bin are arranged inside the still 1 through the L-shaped partition 4, and a U-shaped tube 3 is installed on the outer surface of the upper end of the still 1;
[0025] A connecting gas cylinder 6 is installed at a position corresponding to the gas outlet end inside the distillation kettle 1, the upper end of the connecting gas cylinder 6 is connected to the gas outlet end of the distillation kettle 1, and a blocking ball 7 and a lower sliding block 9 are respectively arranged inside the connecting gas cylinder 6 along the direction from top to bottom, a connecting gas column 8 is fixedly installed between the blocking ball 7 and the lower sliding block 9, and a directional sleeve block 13 is installed on the inner wall position of the connecting gas cylinder 6 corresponding to the blocking ball 7.
[0026] The two ends of the U-shaped tube 3 are respectively connected to the heating chamber and the gas chamber, and a Y-shaped blade 5 is rotatably installed at the upper end of the interior of the U-shaped tube 3, a mounting sleeve 11 is installed at the outer position of the U-shaped tube 3, the output shaft of the Y-shaped blade 5 extends to the inside of the mounting sleeve 11, and a coil spring 12 is installed on the output shaft of the Y-shaped blade 5, and one end of the coil spring 12 is installed in the mounting sleeve 11.
[0027] Basic principle: Refer to Figure 2 and Figure 3 It is explained that the dipropylene glycol mixed liquid is placed in the heating chamber for heating and obtains the dipropylene glycol mixed steam. It should be explained that the distillation temperature of dipropylene glycol is 185-189°C. Therefore, during the continuous distillation process, the steam generated inside the heating chamber and the internal ambient temperature will cause the internal pressure of the heating chamber to increase. Figure 3 and Figure 4 It is explained that: in the normal state, the Y-shaped blade 5 needs to be limited to rotate counterclockwise only, and the coiled spring 12 is wound during its counterclockwise rotation. Therefore, it should be noted that in this process: when installing the coiled spring 12, the winding amount of the coiled spring 12 needs to be preset in advance, so that the Y-shaped blade 5 rotates clockwise in a "natural state". For this, it is also necessary to add a fiber strip at a certain position corresponding to the Y-shaped blade 5 in the U-shaped tube 3. It can be understood that: the steam pressure in the heating chamber is greater than the elastic force of the coiled spring 12, which prompts the coiled spring 5 to rotate to a certain angle, so that the heating chamber and the gas chamber are connected through the U-shaped tube 3;
[0028] The above purpose is that the steam generation process in the heating chamber will not directly interfere with the steam discharge process in the gas chamber.
[0029] Embodiment 2
[0030] This embodiment is a supplementary explanation of the technical solution in Embodiment 1:
[0031] The lower end of the connecting gas cylinder 6 passes through the L-shaped partition 4 and extends to the bottom end of the inner wall of the heating layer. The connecting gas cylinder 6 is provided with a first gas port 14 , and the setting position of the first gas port 14 is higher than the L-shaped partition 4 .
[0032] A connecting spring 10 is installed at the lower end of the lower slider 9, and the lower end of the connecting spring 10 is installed on the bottom end of the connecting air cylinder 6. The connecting air column 8 is hollow at the upper side position corresponding to the lower slider 9, and a floating block 16 is slidably installed on the connecting air column 8. The cross-section of the blocking ball 7 is a vertical ellipse, and the cross-section of the floating block 16 is an upwardly curved arc. A second air port 15 is opened on the connecting air column 8.
[0033] Solution Description: Refer again Figure 3 To illustrate, the steam in the gas bin can only be discharged into the condenser 2 by connecting the gas cylinder 6, and the specific flow process includes the following methods:
[0034] S1: Under the pulling force of the connecting spring 10, the blocking ball 7 is completely attached to the directional sleeve 13, and the floating blocking block 16 is always located at the lower side of the second air port 15, and then the steam only uses the second air port 15 as the only channel. This method is only suitable for the operation state with low steam volume;
[0035] S2: As the steam volume continues to rise, under the action of steam pressure, the floating block 16 will first be driven to move upward until the second gas port 15 is blocked, resulting in the inability of steam to be discharged and the steam pressure continues to increase. Then, the upward thrust borne by the blocking ball 7 overcomes the pulling force of the connecting spring 10, causing the blocking ball 7 to move upward, thereby forming a gap between the blocking ball 7 and the directional sleeve 13, which is used as a flow channel for steam.
[0036] S3: Based on S2, as the steam pressure continues to rise, the floating block 16 continues to move upward and exposes the second gas port 15, and the blocking ball 7 continues to rise as the steam pressure continues to rise, thereby re-combining with the flow process in S1 based on S2.
[0037] Combining the above three methods S1 to S3, the steam in the gas chamber can switch the steam discharge method according to the pressure generated by itself, and will not be affected by the distillation process in the heating chamber.
[0038] In summary: based on the pressure changes caused by the temperature changes in the dipropylene glycol distillation process, the pressure changes are used to drive the angle conversion process of the Y-shaped blades to achieve the connectivity between the heating chamber and the gas chamber, and the balance between the pressure change and the elastic force is used again to temporarily store the high-temperature steam in the gas chamber or release it at a controlled rate, so that the overall distillation process is stable and continuous.
[0039] The above contents are merely examples and explanations of the structure of the utility model. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the utility model or exceed the scope defined in the claims, they should all fall within the protection scope of the utility model.
[0040] 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.
[0041] The preferred embodiments of the utility model disclosed above are only used to help explain the utility model. The preferred embodiments do not describe all the details in detail, nor do they limit the utility model to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the utility model, so that technicians in the relevant technical field can well understand and use the utility model. The utility model is only limited by the claims and their full scope and equivalents.
Claims
1. A dipropylene glycol continuous distillation recovery device, comprising a distillation kettle (1) and a condensation kettle (2), characterized in that: The gas outlet end of the distillation kettle (1) is connected to the gas inlet end of the condensation kettle (2), and an L-shaped partition (4) is installed inside the distillation kettle (1). A heating chamber and a gas chamber are arranged inside the distillation kettle (1) through the L-shaped partition (4), and a U-shaped tube (3) is installed on the outer surface of the upper end of the distillation kettle (1); A connecting gas cylinder (6) is installed at a position corresponding to the gas outlet end inside the distillation kettle (1), the upper end of the connecting gas cylinder (6) is connected to the gas outlet end of the distillation kettle (1), and a blocking ball (7) and a lower sliding block (9) are respectively arranged inside the connecting gas cylinder (6) from top to bottom, a connecting gas column (8) is fixedly installed between the blocking ball (7) and the lower sliding block (9), and a directional sleeve (13) is installed on the inner wall position of the connecting gas cylinder (6) corresponding to the blocking ball (7).
2. A dipropylene glycol continuous distillation recovery device according to claim 1, characterized in that: The two ends of the U-shaped tube (3) are respectively connected to the heating chamber and the gas chamber, and a Y-shaped blade (5) is rotatably mounted at the upper end of the interior of the U-shaped tube (3). A mounting sleeve (11) is mounted at the exterior of the U-shaped tube (3), and an output shaft of the Y-shaped blade (5) extends into the interior of the mounting sleeve (11). A coiled spring (12) is mounted on the output shaft of the Y-shaped blade (5), and one end of the coiled spring (12) is mounted in the mounting sleeve (11).
3. A dipropylene glycol continuous distillation recovery device according to claim 1, characterized in that: The lower end of the connecting gas cylinder (6) passes through the L-shaped partition (4) and extends to the bottom end of the inner wall of the heating layer. The connecting gas cylinder (6) is provided with a first gas port (14), and the setting position of the first gas port (14) is higher than the L-shaped partition (4).
4. A dipropylene glycol continuous distillation recovery device according to claim 1, characterized in that: A connecting spring (10) is installed at the lower end of the lower slider (9), and the lower end of the connecting spring (10) is installed at the bottom end of the connecting air cylinder (6). The connecting air column (8) is hollow at the upper side corresponding to the lower slider (9), and a floating block (16) is slidably installed on the connecting air column (8).
5. A dipropylene glycol continuous distillation recovery device according to claim 4, characterized in that: The cross section of the blocking ball (7) is in the shape of a vertical ellipse, the cross section of the floating blocking block (16) is in the shape of an arc that bends upward, and a second air port (15) is provided on the connecting air column (8).