Mother liquor stirring device for PTA (pure terephthalic acid) preparation

Abstract

The utility model discloses a mother liquor stirring device for PTA (pure terephthalic acid) preparation, which comprises a stirring box, a discharge pipe is arranged at the bottom of the stirring box, a control valve is arranged on the discharge pipe, a feed port is arranged on one side of the top end of the stirring box, an outer pipe shaft penetrates through the middle part of the top end of the stirring box, and an inner pipe shaft penetrates through the outer pipe shaft. An inner cavity of the outer pipe shaft is rotationally connected with an inner shaft, the bottom of the inner shaft penetrates through the outer pipe shaft and extends into an inner cavity of the stirring box, and a plurality of first stirring plates which are uniformly and orderly distributed are arranged on the side wall of the inner shaft. According to the utility model, one motor is adopted to drive the two shafts to simultaneously and reversely rotate, so that the manufacturing cost is saved, the first stirring plate and the second stirring plate simultaneously and reversely stir mother liquor, the mother liquor can be quickly and uniformly stirred and mixed, the stirring effect and the stirring efficiency are greatly improved, and the practicability is high.

Description

Technical Field

[0001] This invention belongs to the field of PTA preparation technology, and particularly relates to a mother liquor stirring device for PTA preparation. Background Technology

[0002] PTA (purified terephthalic acid) mother liquor is the hydrogenation refining unit in the PTA production process. It is the mother liquor obtained after CTA (crude terephthalic acid) is hydrogenated, reduced, crystallized, centrifuged, and flashed. It contains a large amount of organic solid particles such as TA and 4-CBA (p-carboxybenzaldehyde), a small amount of catalyst, water-soluble p-TA (p-methylbenzoic acid), HAC, and other metal ions. The mother liquor needs to be stirred during PTA preparation.

[0003] However, existing PTA preparation mother liquor stirring devices only use a set of stirring plates to stir the mother liquor, resulting in poor mixing uniformity and low stirring efficiency, which affects work efficiency. In addition, the material tends to stick to the cylinder wall during the stirring process, which can easily cause uneven stirring and reduce practicality. Utility Model Content

[0004] The purpose of this invention is to provide a mother liquor stirring device for PTA preparation, so as to solve the technical problems mentioned in the background art.

[0005] To achieve the above objectives, the specific technical solution of this utility model is as follows: A mother liquor stirring device for PTA preparation includes a stirring tank. A discharge pipe is provided at the bottom of the stirring tank, and a control valve is provided on the discharge pipe. A feed inlet is provided on one side of the top of the stirring tank. An outer tube shaft passes through the middle of the top of the stirring tank. An inner shaft is rotatably connected to the inner cavity of the outer tube shaft. The bottom of the inner shaft passes through the outer tube shaft and extends into the inner cavity of the stirring tank. Multiple uniformly and orderly distributed first stirring plates are provided on the side walls of the inner shaft. L-shaped rods are provided on both side walls of the outer tube shaft. Inclined rods are provided at the bottom of the L-shaped rods. Scrapers that contact the inner wall of the stirring tank are provided on the side walls of the L-shaped rods and the inclined rods. Multiple orderly distributed second stirring plates are provided on opposite sides of the two L-shaped rods. A driving mechanism for simultaneously driving the outer tube shaft and the inner shaft to rotate in opposite directions is provided at the top of the stirring tank.

[0006] Preferably, the mixing tank has a hollow structure, and the bottom of the mixing tank has a conical structure.

[0007] Preferably, the bottom of the mixing tank is provided with four support legs arranged in a circumferential array.

[0008] Preferably, the driving mechanism includes a motor mounted on the upper surface of the mixing tank, a third bevel gear sleeved on the shaft of the motor, a first bevel gear sleeved on the top end of the outer tube shaft, and a second bevel gear sleeved on the top end of the inner shaft extending above the outer tube shaft. The third bevel gear is rotatably connected to the first bevel gear and the second bevel gear respectively, and the third bevel gear meshes with both the first bevel gear and the second bevel gear.

[0009] Preferably, the outer tube shaft is rotatably connected to the mixing tank via bearings, the top of the mixing tank is provided with an L-shaped frame, the shaft of the motor is rotatably connected to the vertical section of the L-shaped frame via bearings, and the top of the inner shaft is rotatably connected to the horizontal section of the L-shaped frame via bearings.

[0010] Preferably, the first stirring plate is inclined, and both the first stirring plate and the second stirring plate have rectangular openings on their surfaces.

[0011] The mother liquor stirring device for PTA preparation according to this invention has the following advantages:

[0012] 1. This utility model uses a motor to drive two shafts to rotate in opposite directions simultaneously, which not only saves manufacturing costs, but also allows the first and second stirring plates to stir the mother liquor in opposite directions at the same time, which can quickly and evenly mix the mother liquor, greatly improving the stirring effect and efficiency, and making it highly practical.

[0013] 2. The present invention, through the setting of the scraper, can scrape the inner wall of the mixing tank during the mixing process, which can effectively prevent the mother liquor from adhering to the inner wall of the mixing tank. The rectangular opening reduces the resistance of the first and second mixing plates during mixing. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 for Figure 1 Front view;

[0017] Figure 3 This is a schematic diagram of the drive mechanism in this utility model.

[0018] The markings in the diagram are as follows: 1. Mixing tank; 2. Support leg; 3. Discharge pipe; 4. Inlet; 5. Motor; 6. L-shaped frame; 7. Outer tube shaft; 8. Inner shaft; 9. First bevel gear; 10. Second bevel gear; 11. Third bevel gear; 12. First mixing plate; 13. L-shaped rod; 14. Scraper; 15. Second mixing plate; 16. Inclined rod. Detailed Implementation

[0019] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0020] In the description of the embodiments of this utility model, it should be understood that the terms "length", "vertical", "horizontal", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model.

[0021] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0022] In this embodiment of the invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment of the invention according to the specific circumstances.

[0023] The following disclosure provides many different implementations or examples for different structures of the embodiments of the present invention. To simplify the disclosure of the embodiments of the present invention, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the embodiments of the present invention. Furthermore, reference numerals and / or reference letters may be repeated in different examples of the embodiments of the present invention; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various implementations and / or arrangements discussed.

[0024] To better understand the purpose, structure, and function of this utility model, the following detailed description of a mother liquor stirring device for PTA preparation is provided in conjunction with the accompanying drawings.

[0025] like Figure 1-3 As shown, the present invention provides a mother liquor stirring device for PTA preparation, including a stirring tank 1. The bottom of the stirring tank 1 is provided with four support legs 2 arranged in a circular array. The bottom of the stirring tank 1 is provided with a discharge pipe 3, and a control valve is provided on the discharge pipe 3. The stirring tank 1 has a hollow structure, and the bottom of the stirring tank 1 has a conical structure. The inclined rod 16 is distributed correspondingly to the inner wall of the conical structure. The conical structure facilitates the complete discharge of the mother liquor through the discharge pipe 3. A feed inlet 4 is provided on one side of the top of the mixing tank 1. An outer tube shaft 7 passes through the middle of the top of the mixing tank 1. An inner shaft 8 is rotatably connected to the inner cavity of the outer tube shaft 7. The bottom of the inner shaft 8 passes through the outer tube shaft 7 and extends into the inner cavity of the mixing tank 1. Multiple uniformly and orderly distributed first stirring plates 12 are provided on the side wall of the inner shaft 8. L-shaped rods 13 are provided on both side walls of the outer tube shaft 7. Inclined rods 16 are provided at the bottom of the L-shaped rods 13. Scrapers 14 that contact the inner wall of the mixing tank 1 are provided on the side walls of the L-shaped rods 13 and the inclined rods 16. The scrapers 14 can scrape the inner wall of the mixing tank 1, which can effectively prevent the mother liquor from adhering to the inner wall of the mixing tank 1. Multiple orderly distributed second stirring plates 15 are provided on the opposite side of the two L-shaped rods 13. The first stirring plates 12 are inclined. Rectangular openings are provided on the surface of the first stirring plates 12 and the second stirring plates 15. The rectangular openings reduce the resistance of the first stirring plates 12 and the second stirring plates 15 during stirring.

[0026] The top of the mixing tank 1 is equipped with a drive mechanism for simultaneously driving the outer tube shaft 7 and the inner shaft 8 to rotate in opposite directions. The drive mechanism includes a motor 5 mounted on the upper surface of the mixing tank 1. A third bevel gear 11 is sleeved on the shaft of the motor 5. A first bevel gear 9 is sleeved on the top of the outer tube shaft 7. The top of the inner shaft 8 extends above the outer tube shaft 7 and is sleeved with a second bevel gear 10. The third bevel gear 11 is rotatably connected to both the first bevel gear 9 and the second bevel gear 10, and the third bevel gear 11 meshes with both the first bevel gear 9 and the second bevel gear 10. The outer tube shaft 7 is rotatably connected to the mixing tank 1 via bearings. An L-shaped frame 6 is provided at the top of the mixing tank 1. The shaft of the motor 5 is rotatably connected to the vertical section of the L-shaped frame 6 via bearings. The top of the inner shaft 8 is connected to the L-shaped frame 6 via bearings. The horizontal section is rotated. By starting the motor 5, the third bevel gear 11 rotates, which in turn drives the first bevel gear 9 and the second bevel gear 10 to rotate simultaneously. The first bevel gear 9 and the second bevel gear 10 rotate in opposite directions. At this position, the first bevel gear 9 rotates forward and the second bevel gear 10 rotates in reverse. This causes the first bevel gear 9 to drive the outer tube shaft 7 to rotate forward and the second bevel gear 10 to drive the inner shaft 8 to rotate in reverse. As a result, the first stirring plate 12 and the second stirring plate 15 move in opposite directions at the same time, thereby stirring the mother liquor in the mixing tank 1. Since the first stirring plate 12 rotates in the opposite direction with the inner shaft 8 and the second stirring plate 15 rotates in the forward direction with the outer tube shaft 7, the mother liquor can be quickly stirred and mixed evenly, which greatly improves the stirring effect and stirring efficiency.

[0027] It is understood that this utility model has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this utility model. Furthermore, under the teachings of this utility model, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of this utility model.

Claims

1. A mother liquor stirring device for PTA production, characterized in that: The utility model provides a stirring box (1), the bottom of stirring box (1) is provided with discharge pipe (3), be provided with control valve on discharge pipe (3), the top one side of stirring box (1) is provided with feed inlet (4), the top middle part of stirring box (1) is penetrated with outer tube axle (7), the inner chamber rotation of outer tube axle (7) is connected with inner axle (8), the bottom of inner axle (8) penetrates outer tube axle (7) and extends to the inner chamber of stirring box (1), and the lateral wall of inner axle (8) is provided with a plurality of first stirring board (12) that uniform order distributes, both lateral walls of outer tube axle (7) are provided with L type rod (13), the bottom of L type rod (13) is provided with inclined rod (16), and the lateral wall of L type rod (13) and inclined rod (16) is provided with the scraping blade (14) of contact with the inner wall of stirring box (1), and the opposite side of two L type rod (13) is provided with a plurality of second stirring board (15) that order distributes, and the top of stirring box (1) is provided with the drive mechanism for driving outer tube axle (7) and inner axle (8) reverse rotation simultaneously.

2. A mother liquor stirring device for PTA production according to claim 1, characterized in that: The stirring box (1) is a hollow structure, and the bottom of the stirring box (1) is a conical structure.

3. A mother liquor stirring device for PTA production according to claim 1, characterized in that: The bottom of the stirring box (1) is provided with four support legs (2) arranged in a circumferential array.

4. A mother liquor stirring device for PTA production according to claim 1, characterized in that: The drive mechanism includes a motor (5) mounted on the upper surface of the stirring box (1), a third bevel gear (11) sleeved on the shaft portion of the motor (5), a first bevel gear (9) sleeved on the top end of the outer tube axle (7), and a second bevel gear (10) sleeved on the top end of the inner axle (8) extending above the outer tube axle (7). The third bevel gear (11) is rotationally connected with the first bevel gear (9) and the second bevel gear (10), respectively, and the third bevel gear (11) is in meshing engagement with the first bevel gear (9) and the second bevel gear (10).

5. A mother liquor stirring device for PTA production according to claim 4, characterized in that: The outer tube axle (7) is rotationally connected with the stirring box (1) through a bearing, the top end of the stirring box (1) is provided with an L-shaped bracket (6), the shaft portion of the motor (5) is rotationally connected with the vertical section of the L-shaped bracket (6) through a bearing, and the top end of the inner axle (8) is rotationally connected with the horizontal section of the L-shaped bracket (6) through a bearing.

6. A mother liquor stirring device for PTA production according to claim 1, characterized in that: The first stirring board (12) is inclined, and the surfaces of the first stirring board (12) and the second stirring board (15) are provided with rectangular openings.

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