Mixing and stirring equipment for glycerol triacetate production

Abstract

The utility model belongs to the field of chemical mixing and stirring equipment, and discloses mixing and stirring equipment for glycerol triacetate production, which comprises a stirring barrel, the top and the bottom of the stirring barrel are sealed, materials are fed through a top feed port, materials are discharged through a discharge port in the center of the bottom, and a main stirring device is mounted in the center in the stirring barrel. The main stirring device is driven by a top motor, the stirring barrel is provided with a gear set structure, the gear set structure and the stirring barrel are sealed through a top cover, the motor is fixed to the top cover, a plurality of auxiliary stirring devices are arranged on the circumference of the main stirring device, and the motor provides power for the auxiliary stirring devices through the gear set structure. A center cylinder is fixed in the stirring barrel between the main stirring device and the auxiliary stirring device, the top of the center cylinder is open, liquid circulates through a circulating bottom opening in the circumference of the bottom, and the main stirring device and the auxiliary stirring device enable the liquid to flow in opposite directions to form circulation. The esterification reaction mixing and stirring efficiency is enhanced, the liquid circulation strength is increased, and the mixing and stirring time is shortened.

Description

Technical Field

[0001] The utility model belongs to the field of chemical mixing and stirring equipment, and particularly relates to a mixing and stirring equipment for the production of triacetin. Background Technique

[0002] Triacetin is an organic compound, a colorless and odorless oily liquid. It can be used as a binder for cigarette filters and a flavor fixative, a solvent and a toughening agent. It is obtained by the esterification reaction of glycerol and acetic acid. The specific steps include preheating glycerol to 50 - 60 °C, then adding acetic acid, benzene and sulfuric acid for heating and stirring under reflux for dehydration. After dehydration is completed, benzene is recovered, and then acetic anhydride is added and heated for 4 hours. After a series of treatments (such as neutralization, drying, vacuum distillation, etc.), triacetin is obtained. Among them, during the mixing and stirring process, the mixing efficiency is low, and it takes a long time to complete the mixing and stirring process, which affects the processing and production efficiency of triacetin. Content of the Utility Model

[0003] The purpose of the utility model is to provide a mixing and stirring equipment for the production of triacetin, so as to solve the problems of low mixing and stirring efficiency and long time consumption in the production of triacetin.

[0004] In order to achieve the above purpose, the technical scheme adopted by the utility model is:

[0005] A mixing and stirring equipment for the production of triacetin includes a stirring barrel. The stirring barrel is a barrel body with sealed top and bottom, and feeds through the top feed port and discharges through the discharge port at the center of the bottom. A main stirring device is installed at the center inside the stirring barrel. The main stirring device is driven by a top motor. The stirring barrel is provided with a gear group structure. The gear group structure is sealed with the stirring barrel through the top cover, and the motor is fixed on the top cover. A plurality of sub-stirring devices are arranged circumferentially around the main stirring device. The motor provides power to the sub-stirring devices through the gear group structure. A central cylinder is fixed inside the stirring barrel between the main stirring device and the sub-stirring devices. The top of the central cylinder is open, and the bottom communicates through a circumferential circulating bottom port. The main stirring device and the sub-stirring devices make the liquid flow in opposite directions to form a cycle.

[0006] Preferably, the gear group structure includes a driving gear and a driven gear. The driving gear rotates synchronously with the main stirring device. A plurality of driven gears are externally meshed on the circumference of the driving gear. The driven gears are fixedly corresponding to the positions of the sub-stirring devices and rotate synchronously.

[0007] Preferably, the main stirring device includes a driving shaft and a main stirring paddle. The driving shaft is fixed to the output end of the motor. The driving gear is fixed to the driving shaft. A main stirring paddle is fixed to the bottom of the driving shaft and is located inside the central cylinder.

[0008] Preferably, the auxiliary stirring device includes a driven shaft and auxiliary stirring paddles. The driven shaft is fixed to a driven gear, and auxiliary stirring paddles are fixed to the bottom of the driven shaft and located outside the central cylinder.

[0009] Preferably, the top and bottom of the central cylinder are respectively an upper flared opening and a lower flared opening, and the circumferential circulation bottom opening is formed on the lower flared opening.

[0010] Preferably, an arc-shaped guide plate is fixed to the inner circumferential surface of the upper flared opening.

[0011] Preferably, a housing is welded to the outside of the stirring barrel. A liquid inlet is welded to the left side of the housing, and a liquid outlet is welded to the right side.

[0012] The utility model has the following beneficial effects:

[0013] 1. The main stirring device in the stirring barrel can stir the mixture to form a swirling flow in a circular motion. Through the action of the central cylinder, the liquid inside the central cylinder rises and then re-enters through the circulation bottom opening outside the central cylinder, causing the liquid to form a circulating flow in the vertical direction while rotating in a circle. The auxiliary stirring device increases the liquid circulation force, enhances the mixing and stirring efficiency of the esterification reaction, and shortens the mixing and stirring time.

[0014] 2. The upper and lower parts of the central cylinder are an upper flared opening and a lower flared opening, making the circulating flow of the liquid in the vertical direction smoother, reducing the obstruction of the central cylinder to the liquid, accelerating the efficiency of the circulating flow, further enhancing the mixing and stirring efficiency. With the action of the guide plate, when the mixed liquid rotates in the circumferential direction, the liquid can also be dispersed by the guide plate, accelerating the mixing and stirring efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic diagram of the external structure of the utility model;

[0016] Figure 2 is a longitudinal sectional schematic diagram of the utility model;

[0017] Figure 3 is a schematic diagram of the external structure of the gear set of the utility model;

[0018] Figure 4 is a schematic diagram of the connection between the gear set structure and the main stirring device and the auxiliary stirring device of the utility model;

[0019] Figure 5 is a schematic diagram of the external structure of the central cylinder of the utility model;

[0020] Icon: 1. Stirring barrel; 11. Outer shell; 12. Liquid inlet; 13. Liquid outlet; 2. Feed inlet; 3. Discharge outlet; 4. Main stirring device; 41. Driving shaft; 42. Main stirring paddle; 5. Motor; 6. Gear set structure; 61. Driving gear; 62. Driven gear; 7. Top cover; 8. Sub-stirring device; 81. Driven shaft; 82. Sub-stirring paddle; 9. Central cylinder; 91. Circulation bottom opening; 92. Upper flared opening; 93. Lower flared opening; 94. Deflector plate. Specific embodiments

[0021] The following further describes in detail the embodiments of the present utility model in conjunction with the accompanying drawings and embodiments. The following embodiments are used to illustrate the present utility model, but cannot be used to limit the scope of the present utility model.

[0022] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0023] Such as Figures 1-5As shown in the figure, in this embodiment, a mixing and stirring device for the production of glycerol triacetate includes a stirring barrel 1. The stirring barrel 1 is a barrel body with sealed top and bottom. A tubular feed port 2 is welded to the top, which is the main inlet for glycerol, acetic acid, benzene, and sulfuric acid. A tubular discharge port 3 is welded to the center of the bottom, which is the main discharge port after the mixing and stirring esterification reaction. The feed port 2 and the discharge port 3 are controlled by valve switches. An outer shell 11 is welded to the outside of the stirring barrel 1. A liquid inlet 12 is welded to the left side of the outer shell 11, and a liquid outlet 13 is welded to the right side. Hot water is introduced through the liquid inlet 12 to heat the stirring barrel 1 and discharged from the liquid outlet 13. The heating temperature is controlled at 50 - 60 °C to meet the necessary conditions for heating and stirring. A main stirring device 4 is installed at the center inside the stirring barrel 1. The main stirring device 4 is driven by a top motor 5 and can stir the mixture to form a swirling flow in a circular motion. The stirring barrel 1 is provided with a gear set structure 6. The gear set structure 6 is sealed with the stirring barrel 1 through a top cover 7, playing a role in protection and dust prevention. The motor 5 is bolted to the top cover 7. A plurality of auxiliary stirring devices 8 are arranged circumferentially around the main stirring device 4. The motor 5 provides power to the auxiliary stirring devices 8 through the gear set structure 6. A central cylinder 9 is fixed inside the stirring barrel 1 between the main stirring device 4 and the auxiliary stirring devices 8. The top of the central cylinder 9 is open, and the bottom communicates through a circumferential circulation bottom port 91, enabling the liquid inside the central cylinder to rise and re-enter through the circulation bottom port outside the central cylinder, forming a circulation flow in the vertical direction while the liquid rotates in a circular motion. The main stirring device 4 and the auxiliary stirring devices 8 make the liquid flow in opposite directions, forming a circulation, increasing the liquid circulation intensity, enhancing the mixing and stirring efficiency, and shortening the mixing and stirring time.

[0024] Specifically, the gear set structure 6 includes a driving gear 61 and a driven gear 62. The driving gear 61 rotates synchronously with the main stirring device 4. A plurality of driven gears 62 are externally meshed with the circumference of the driving gear 61. The driven gears 62 are fixedly corresponding to the positions of the auxiliary stirring devices 8 and rotate synchronously. The motor 5 drives the driving gear 61 to provide power to the driven gears 62, simultaneously realizing the operation of the main stirring device 4 and the auxiliary stirring devices 8.

[0025] Specifically, the main stirring device 4 includes a driving shaft 41 and main stirring paddles 42. The driving shaft 41 is fixed to the output end of the motor 5. The driving gear 61 is fixed to the driving shaft 41. The main stirring paddles 42 are fixed to the bottom of the driving shaft 41 and are located inside the central cylinder 9. The auxiliary stirring device 8 includes a driven shaft 81 and auxiliary stirring paddles 82. The driven shaft 81 is fixed to the driven gear 62. The auxiliary stirring paddles 82 are fixed to the bottom of the driven shaft 81 and are located outside the central cylinder 9. The main stirring paddles 42 and the auxiliary stirring paddles 82 rotate synchronously and make the liquid flow in opposite directions up and down, forming a circulation.

[0026] Specifically, the top and bottom parts of the central cylinder 9 are respectively an upper flared opening 92 and a lower flared opening 93, and the circumferential circulation bottom opening 91 is formed on the lower flared opening 93. The upper flared opening 92 and the lower flared opening 93 make the circulation flow direction of the liquid more smooth in the up and down directions, reduce the obstruction of the central cylinder 9 to the liquid, accelerate the circulation flow efficiency, and further enhance the mixing and stirring efficiency.

[0027] Specifically, an arc-shaped guide plate 94 is fixedly arranged on the inner side surface circumference of the upper flared opening 92. When the mixed liquid rotates in the circumferential direction, the liquid can also be dispersed by the guide plate, accelerating the stirring and mixing efficiency.

[0028] The working principle of the present utility model is as follows: Glycerol is added into the stirring barrel 1 through the feed port 2, hot water is added through the liquid inlet 12 and flows out from the liquid outlet 13, and the glycerol in the stirring barrel 1 is preheated to 50 - 60 °C. Then acetic acid, benzene and sulfuric acid are added. The motor 5 drives the driving gear 61 to rotate, and through the driving gear 61, the engaged driven gear 62 rotates synchronously, so that the main stirring paddle 42 and a plurality of auxiliary stirring paddles 82 which are respectively connected rotate and stir simultaneously. The main stirring paddle 42 and the auxiliary stirring paddle 82 make the up and down flow directions of the liquid opposite, so that the liquid rotates circumferentially in the central cylinder 9 in a vortex shape. The liquid forms a centripetal force through the circumferential rotation and diffuses outward. It is guided by the guide plate 94 in a certain direction, and the liquid substances are dispersed again, accelerating the stirring efficiency. The water flow falls outside the central cylinder 9 and enters the bottom of the central cylinder 9 again through the circulation bottom opening 91, forming a circulation, increasing the water flow direction, and making the liquid fully mixed and stirred. During this period, the auxiliary stirring paddle 82 provides a downward thrust in the central cylinder 9, strengthening the liquid circulation force, and realizing the efficient completion of the esterification reaction through mixing and stirring.

[0029] Although the embodiments of the present utility model have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A mixing and stirring device for producing triacetin, comprising a mixing barrel (1), characterized in that: The stirring barrel (1) is a barrel body with top and bottom sealed, and the material is fed through the top feeding port (2), and the material is discharged through the discharge port (3) arranged at the center of the bottom. A main stirring device (4) is installed in the center of the stirring barrel (1), and the main stirring device (4) is driven by a top motor (5). The stirring barrel (1) is provided with a gear set structure (6), and the gear set structure (6) is sealed with the stirring barrel (1) through a top cover (7), and the motor (5) is fixed on the top cover (7). A plurality of auxiliary stirring devices (8) are arranged around the circumference of the main stirring device (4), and the motor (5) provides power to the auxiliary stirring devices (8) through the gear set structure (6). A central tube (9) is fixed in the stirring barrel (1) between the main stirring device (4) and the auxiliary stirring device (8), and the top of the central tube (9) is open, and the bottom is circumferentially circulated through a circulation bottom port (91), and the main stirring device (4) and the auxiliary stirring device (8) make the liquid flow in opposite directions to form a circulation.

2. A mixing and stirring device for producing triacetin according to claim 1, characterized in that: The gear set structure (6) comprises a driving gear (61) and a driven gear (62); the driving gear (61) rotates synchronously with the main stirring device (4); a plurality of driven gears (62) are meshed outside the circumference of the driving gear (61); the driven gear (62) and the auxiliary stirring device (8) are fixed in position corresponding to each other and rotate synchronously.

3. A mixing and stirring device for producing triacetin according to claim 2, characterized in that: The main stirring device (4) comprises a driving shaft (41) and a main stirring paddle (42); the driving shaft (41) is fixed to the output end of the motor (5); the driving gear (61) is fixed to the driving shaft (41); and the main stirring paddle (42) is fixed to the bottom of the driving shaft (41) and is located in the central tube (9).

4. A mixing and stirring device for producing triacetin according to claim 2, characterized in that: The auxiliary stirring device (8) comprises a driven shaft (81) and an auxiliary stirring paddle (82); the driven shaft (81) is fixed to a driven gear (62); an auxiliary stirring paddle (82) is fixed to the bottom of the driven shaft (81) and is located outside the central tube (9).

5. A mixing and stirring device for producing triacetin according to claim 1, characterized in that: The top and bottom of the central tube (9) are respectively an upper bell mouth (92) and a lower bell mouth (93), and the circulation bottom mouth (91) is circumferentially opened on the lower bell mouth (93).

6. A mixing and stirring device for producing triacetin according to claim 5, characterized in that: An arc-shaped flow guide plate (94) is fixed on the circumference of the inner side surface of the upper bell mouth (92).

7. A mixing and stirring device for producing triacetin according to claim 1, characterized in that: An outer shell (11) is welded to the outside of the mixing barrel (1), a liquid inlet (12) is welded to the left side of the outer shell (11), and a liquid outlet (13) is welded to the right side.

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