A phenylacetic acid ethyl ester esterification reactor

Abstract

This utility model discloses an esterification reactor for ethyl phenylacetate. The reactor body has a lid on its upper surface and a jacket covering the exterior. The lid has two vertical feed ports and one concentrated sulfuric acid feed port. The concentrated sulfuric acid feed port passes through the lid and is connected to an inclined tube at its bottom. The top of the main shaft is connected to the output shaft of a motor via a coupling. The conical stirrer includes a conical cylinder and triangular stirring plates. The conical cylinder is fitted over the main shaft, and several triangular stirring plates are arranged along the length of the outer surface of the conical cylinder. The bottom of the inclined tube faces the conical cylinder and is located on the upper side of the conical cylinder. A U-shaped stirring paddle is provided at the bottom of the main shaft. This utility model has a reasonable structure. When concentrated sulfuric acid is slowly added, it slides down the surface of the conical cylinder and slowly contacts the ethanol, preventing direct dripping onto the ethanol and causing boiling. Simultaneously, during the addition and mixing process, the triangular stirring plates of the conical stirrer provide auxiliary stirring, improving the esterification reaction effect.

Description

Technical Field

[0001] This utility model relates to the field of reaction vessel technology, specifically to a phenylethyl acetate esterification reaction vessel. Background Technology

[0002] As a crucial raw material in the fragrance and flavor industry, ethyl phenylacetate is widely used in the formulation of various high-end perfumes, fragrances, and cosmetics. Its sweet and delicate rose and jasmine scents endow products with unique aromas, enhancing their overall quality and market competitiveness. In perfume formulation, ethyl phenylacetate often works synergistically with other fragrance components such as geraniol and nerol to create an intoxicating aroma effect. In the food industry, ethyl phenylacetate is also used as a food additive and flavoring ingredient. It adds pleasant aromas and flavors to food, making it more delicious. For example, adding an appropriate amount of ethyl phenylacetate to candies, pastries, and beverages can impart an enticing aroma, attracting consumers' attention. Simultaneously, ethyl phenylacetate also has a certain preservative effect, extending the shelf life of food. In the field of pharmaceutical synthesis, ethyl phenylacetate can serve as an intermediate in organic synthesis and pharmaceutical chemistry. For instance, it can be used to produce the barbiturate-like hypnotic drug phenobarbital, exerting its hypnotic effect by regulating the activity of the neurotransmitter GABA in the central nervous system. It is widely used to treat insomnia. It can also be used in organic synthesis and the manufacture of drugs such as atropine and sucralose (synthetic method), or as an analytical reagent.

[0003] In the esterification reaction of ethyl phenylacetate, ethanol is added first, followed by concentrated sulfuric acid, and finally phenylacetic acid. To avoid boiling over, the concentrated sulfuric acid in the existing ethyl phenylacetate esterification reactor is usually added directly and slowly dropwise into the reactor. However, when it drips into the ethanol, the solution splashes and easily causes local boiling over, and the efficiency is also reduced. Therefore, an improved technology is urgently needed to solve this problem in the existing technology. Utility Model Content

[0004] The purpose of this invention is to provide a phenylethyl acetate esterification reactor to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an ethyl phenylacetate esterification reactor, comprising a reactor body and a stirrer;

[0006] The upper surface of the reactor body is provided with a reactor lid, and a motor is provided at the center of the upper surface of the reactor lid via a motor base. The reactor body is wrapped with a jacket, and a discharge port is provided at the bottom of the reactor body. The upper surface of the reactor lid is also provided with two vertical feeding ports and one concentrated sulfuric acid feeding port. The concentrated sulfuric acid feeding port passes through the reactor lid and is connected to an inclined tube at the bottom.

[0007] The agitator includes a main shaft, a conical agitator, and a U-shaped agitator. The top of the main shaft is connected to the output shaft of a motor via a coupling. The conical agitator includes a conical cylinder and triangular agitator plates. The conical cylinder is fitted around the main shaft. Several triangular agitator plates are arranged on the outer surface of the conical cylinder along its length. The bottom of the inclined tube faces the conical cylinder and is located on the upper side of the conical cylinder. A U-shaped agitator plate is arranged at the bottom of the main shaft. Both the conical agitator and the U-shaped agitator plate are rotatably mounted inside the vessel.

[0008] Preferably, the ethyl phenylacetate esterification reactor provided by this utility model has an oil inlet at the bottom of the jacket and an oil outlet at the top of the jacket.

[0009] Preferably, the ethyl phenylacetate esterification reactor provided by this utility model has several support seats provided on the outside of the jacket.

[0010] Preferably, the ethyl phenylacetate esterification reactor provided by this utility model is provided with a thermometer port and a pressure gauge port on the upper surface of the reactor lid.

[0011] Preferably, the present invention provides an ethyl phenylacetate esterification reactor, wherein a channel is provided at the center of the conical cylinder, the main shaft is inserted into the channel, and connecting sleeves are respectively provided at both ends of the conical cylinder, the connecting sleeves are sleeved with the main shaft and fastened by bolts.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] A conical stirrer is installed on the main shaft. The bottom of the inclined tube connected to the concentrated sulfuric acid feed port faces the conical cylinder and is located on the upper side of the conical cylinder. When concentrated sulfuric acid is slowly added, the concentrated sulfuric acid slides down the surface of the conical cylinder and slowly comes into contact with the ethanol, preventing direct dripping onto the ethanol and causing boiling. At the same time, when the feeding is completed and the mixture is stirred, the triangular stirring plate of the conical stirrer is used for auxiliary stirring, which improves the esterification reaction effect. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 This is a schematic diagram of the cross-sectional structure of a cone-shaped agitator.

[0016] In the diagram: 1. Reactor body; 2. Reactor cover; 3. Motor; 4. Jacket; 5. Discharge port; 6. Vertical feed port; 7. Concentrated sulfuric acid feed port; 8. Inclined tube; 9. Main shaft; 10. Conical agitator; 11. U-shaped agitator; 12. Oil inlet; 13. Oil outlet; 14. Support base; 15. Thermometer port; 16. Pressure gauge port; 1001. Conical cylinder; 1002. Triangular stirring plate; 1003. Channel; 1004. Connecting sleeve. Detailed Implementation

[0017] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0018] It should be noted that in the description of this utility model, the terms "inner", "outer", "upper", "lower", "both sides", "one end", "the other end", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing 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 this utility model.

[0019] Please see Figure 1-2 This utility model provides a technical solution: an ethyl phenylacetate esterification reactor, including a reactor body 1 and a stirrer;

[0020] The upper surface of the vessel body 1 is provided with a vessel cover 2. A motor 3 is installed at the center of the upper surface of the vessel cover 2 via a motor base. The vessel body 1 is wrapped with a jacket 4. The bottom of the jacket 4 is provided with an oil inlet 12 and the top of the jacket 4 is provided with an oil outlet 13 to allow hot oil to enter or leave the jacket 4, thereby achieving heat exchange with the material. Several support seats 14 are provided on the outside of the jacket 4 to achieve overall support and fixation. The bottom of the vessel body 1 is provided with a discharge port 5. The upper surface of the vessel cover 2 is also provided with two vertical feeding ports 6 and a concentrated sulfuric acid feeding port 7. The concentrated sulfuric acid feeding port 7 passes through the vessel cover 2 and is connected to an inclined tube 8 at the bottom. The upper surface of the vessel cover 2 is also provided with a thermometer port 15 and a pressure gauge port 16 to install a thermometer and a pressure gauge, thereby achieving the detection of temperature and pressure inside the vessel body 1.

[0021] The agitator includes a main shaft 9, a conical agitator 10, and a U-shaped agitator paddle 11. The top end of the main shaft 9 is connected to the output shaft of the motor 3 via a coupling. The conical agitator 10 includes a conical cylinder 1001 and triangular agitator plates 1002. The conical cylinder 1001 is fitted around the main shaft 9. Several triangular agitator plates 1002 are arranged on the outer surface of the conical cylinder 1001 along its length. The bottom of the inclined tube 8 faces the conical cylinder 1001 and is located on the upper side of the conical cylinder 1001. A U-shaped stirring paddle 11 is provided at the bottom of the vessel 9. Both the conical stirrer 10 and the U-shaped stirring paddle 11 are rotatably installed inside the vessel body 1. A channel 1003 is opened at the center of the conical cylinder 1001. The main shaft 9 is inserted into the channel 1003. Connecting sleeves 1004 are provided at both ends of the conical cylinder 1001. The connecting sleeves 1004 are sleeved with the main shaft 9 and fastened with bolts. The connection and disassembly between the conical cylinder 1001 and the main shaft 9 can be realized through the cooperation of the connecting sleeves 1004.

[0022] Installation method and operating principle: Insert the conical cylinder 1001 of the conical agitator 10 into the main shaft 9. After aligning the holes, use bolts to secure the connecting sleeves 1004 at both ends of the conical cylinder 1001 to the main shaft 9. Weld the middle position of the U-shaped stirring paddle 11 to the bottom of the main shaft 9. Install the motor 3 at the center of the upper surface of the vessel cover 2 through the motor mount. Then connect the top of the main shaft 9 to the output shaft of the motor 3 through a coupling. After lifting the vessel cover 2, place the conical agitator 10 and the U-shaped stirring paddle 11 into the vessel body 1 until the vessel cover 2 is pressed against the upper surface of the vessel body 1. Weld the vessel cover 2 to the vessel body 1 to complete the installation. In use, the two vertical feed ports 6 are connected to the storage tanks of phenylacetic acid and ethanol respectively through control valves and pipelines. The vertical feed port 6 of concentrated sulfuric acid is connected to the storage tank of concentrated sulfuric acid through a control valve and pipeline. During processing, ethanol is first added through one of the vertical feed ports 6, and then concentrated sulfuric acid is slowly added through the vertical feed port 6 of concentrated sulfuric acid. At this time, the motor 3 is stopped or running at low speed. The concentrated sulfuric acid slides down the conical cylinder 1001 of the conical stirrer 10 and comes into contact with the ethanol. After the concentrated sulfuric acid is added, phenylacetic acid is added through the other vertical feed port 6. Hot oil is poured into the jacket 4 and the temperature is maintained at 60-70°C. After the reaction lasts for 2-3 hours, the esterification reaction of ethyl phenylacetate is completed. This utility model has a reasonable structure. A conical stirrer 10 is provided on the main shaft 9. The bottom of the inclined tube 8, which is connected to the concentrated sulfuric acid vertical feed port 6, faces the conical cylinder 1001 and is located on the upper side of the conical cylinder 1001. When concentrated sulfuric acid is slowly added, the concentrated sulfuric acid slides down the surface of the conical cylinder 1001 and slowly comes into contact with the ethanol, preventing direct dripping onto the ethanol and causing boiling. At the same time, when the feeding is completed and the mixture is stirred, the triangular stirring plate 1002 of the conical stirrer 10 is used for auxiliary stirring, which improves the esterification reaction effect.

[0023] Any aspects of this utility model not described in detail are well-known technologies to those skilled in the art.

[0024] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although this utility model has been described in detail with reference to the embodiments, those skilled in the art should understand that modifications and equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A reaction vessel for esterification of ethyl phenylacetate, characterized in that: Includes the vessel body (1) and a stirrer; The upper surface of the vessel body (1) is provided with a vessel lid (2), and a motor (3) is provided at the center of the upper surface of the vessel lid (2) through a motor seat. The vessel body (1) is wrapped with a jacket (4). The bottom of the vessel body (1) is provided with a discharge port (5). The upper surface of the vessel lid (2) is also provided with two vertical feeding ports (6) and a concentrated sulfuric acid feeding port (7). The concentrated sulfuric acid feeding port (7) passes through the vessel lid (2) and is connected to an inclined tube (8) at the bottom. The agitator includes a main shaft (9), a conical agitator (10), and a U-shaped agitator (11). The top end of the main shaft (9) is connected to the output shaft of the motor (3) via a coupling. The conical agitator (10) includes a conical cylinder (1001) and a triangular agitator (1002). The conical cylinder (1001) is fitted around the main shaft (9). Several triangular agitators (1002) are arranged on the outer surface of the conical cylinder (1001) along its length. The bottom of the inclined tube (8) faces the conical cylinder (1001) and is located on the upper side of the conical cylinder (1001). A U-shaped agitator (11) is arranged at the bottom of the main shaft (9). The conical agitator (10) and the U-shaped agitator (11) are both rotatably arranged inside the vessel body (1).

2. The ethyl phenylacetate esterification reactor according to claim 1, characterized in that: The jacket (4) has an oil inlet (12) at the bottom and an oil outlet (13) at the top.

3. The ethyl phenylacetate esterification reactor according to claim 1, characterized in that: The jacket (4) is provided with several support seats (14) on its outside.

4. The ethyl phenylacetate esterification reactor according to claim 1, characterized in that: The upper surface of the vessel lid (2) is also provided with a thermometer port (15) and a pressure gauge port (16).

5. The ethyl phenylacetate esterification reactor according to claim 1, characterized in that: The conical cylinder (1001) has a channel (1003) at its center. The main shaft (9) is inserted into the channel (1003). Connecting sleeves (1004) are provided at both ends of the conical cylinder (1001). The connecting sleeves (1004) are sleeved with the main shaft (9) and fastened with bolts.

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