A reaction kettle for benzaldehyde cyanohydrin preparation

Abstract

The utility model discloses a reaction kettle for benzaldehyde cyanohydrin preparation, including the reaction kettle main part, the top fixed assembly of reaction kettle main part has the feed pipe, the bottom fixed assembly of reaction kettle main part has the discharge pipe, the fixed assembly of discharge pipe inside has the discharge valve, the lateral wall assembly of reaction kettle main part has the cooling mechanism, the top fixed assembly of reaction kettle main part has the stirring mechanism. Can select corresponding cooling layer to cool according to the quantity of reaction solution. When the reaction solution is less, only through single -layer cooling system cooling, thereby reduce energy consumption. And, the upper cooling layer and the lower cooling layer cooperate with each other, can effectively improve the cooling efficiency of the reaction solution in the reaction kettle, realize the quick cooling of reaction solution. At the same time, by embedding the heat exchange block in the second cooling cavity, the cooling efficiency can be further improved, the temperature of the reaction solution is more uniform, the phenomenon of local overheating or supercooling is avoided, and the quality of the product produced by the reaction kettle is improved.

Description

Technical Field

[0001] This utility model relates to the field of reaction vessel technology, and specifically to a reaction vessel for the preparation of benzaldehyde cyanohydrin. Background Technology

[0002] Benzaldehyde cyanohydrin (also known as mandelic acid nitrile, phenylethanol nitrile, chemical name 2-hydroxy-2-phenylacetonitrile) is an important pharmaceutical intermediate, mainly used in the synthesis of side chains of penicillin antibiotics (such as DL-phenylglycine and its derivatives), and also has wide applications in pesticides and dyes. The preparation of benzaldehyde cyanohydrin requires a reaction vessel, but most existing reaction vessels only have one set of cooling coils. Even when the amount of material in the reaction vessel is small, all coils need to be activated for cooling, resulting in relatively high energy consumption. Furthermore, if the coils inside the reaction vessel corrode or break during operation, the cooling medium may enter the reaction vessel and react with the reaction solution, generating toxic gases and causing safety accidents. Utility Model Content

[0003] The purpose of this invention is to provide a reaction vessel for the preparation of benzaldehyde cyanohydrin, so as to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a reaction vessel for the preparation of benzaldehyde cyanohydrin, comprising a reaction vessel body, a feed pipe fixedly mounted on the top of the reaction vessel body, a discharge pipe fixedly mounted on the bottom of the reaction vessel body, a discharge valve fixedly mounted inside the discharge pipe, a cooling mechanism mounted on the side wall of the reaction vessel body, and a stirring mechanism fixedly mounted on the top of the reaction vessel body. The cooling mechanism includes a first cooling layer and a second cooling layer, which are integrally formed on the side wall of the reactor body. The first cooling layer and the second cooling layer are respectively provided with a first cooling cavity and a second cooling cavity. The first cooling cavity and the second cooling cavity are respectively fixedly connected with a liquid supply connector and a liquid outlet connector. A heat exchange block is embedded in the second cooling cavity.

[0005] Preferably, the first cooling cavity is spirally distributed within the first cooling layer.

[0006] Preferably, the heat exchange blocks are evenly distributed circumferentially around the center of the reactor body.

[0007] Preferably, the stirring mechanism includes a drive motor, the output end of which is fixedly connected to a drive shaft that extends through the inner cavity of the reactor body, and the side wall of the drive shaft is fixedly connected to a first stirring blade and a second stirring blade that are evenly distributed in a circumference.

[0008] Preferably, the first stirring blade and the second stirring blade are inclined in opposite directions.

[0009] Preferably, the sidewalls of the first stirring blade and the second stirring blade are respectively provided with through holes.

[0010] Compared with existing technologies, the beneficial effects of this invention are as follows: This invention provides a reaction vessel for the preparation of benzaldehyde. In this invention, an upper cooling layer and a lower cooling layer work together to achieve zoned cooling of the interior of the reaction vessel. During use, the appropriate cooling layer can be selected based on the amount of reaction solution. When the amount of reaction solution is small, cooling is achieved only through a single-layer cooling system, thereby reducing energy consumption. Furthermore, the cooperation between the upper and lower cooling layers effectively improves the cooling efficiency of the reaction solution within the reaction vessel, achieving rapid cooling. Simultaneously, by embedding heat exchange blocks within the second cooling chamber, cooling efficiency is further improved, resulting in a more uniform temperature of the reaction solution and preventing localized overheating or undercooling, thus improving the quality of the product produced by the reaction vessel. In addition, this invention fills the upper and lower cooling layers with cooling medium, which, compared to the traditional cooling method of arranging coils inside the reaction vessel, reduces the risk of cooling medium leakage into the reaction vessel, minimizing the occurrence of safety accidents. Attached Figure Description

[0011] Figure 1 This is a perspective view of the present invention.

[0012] Figure 2 This is a schematic diagram of the structure of this utility model.

[0013] Figure 3 This is a schematic diagram of the heat exchange block of this utility model.

[0014] Figure 4 This is a schematic diagram of the stirring mechanism of this utility model.

[0015] Figure 5 This is a schematic diagram of the cooling water circulation system of this utility model.

[0016] In the diagram: 1. Reactor body; 2. Feed pipe; 3. Discharge pipe; 4. Discharge valve; 5. Cooling mechanism; 51. Upper cooling layer; 52. Lower cooling layer; 53. First cooling chamber; 54. Second cooling chamber; 55. Liquid supply connector; 56. Liquid outlet connector; 57. Heat exchange block; 6. Stirring mechanism; 61. Drive motor; 62. Drive shaft; 63. First stirring blade; 64. Second stirring blade; 65. Through hole. Detailed Implementation

[0017] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0018] Please see Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 This utility model provides a technical solution: a reaction vessel for the preparation of benzaldehyde cyanohydrin, including a reaction vessel body 1, a feed pipe 2 fixedly connected to the top of the reaction vessel body 1, the feed pipe 2 being used to feed the material to be reacted into the reaction vessel body 1, a discharge pipe 3 fixedly connected to the bottom of the reaction vessel body 1, the discharge pipe 3 being used to output the synthesized material after reaction, and a discharge valve 4 fixedly installed inside the discharge pipe 3, the opening and closing of the discharge pipe 3 being controlled by the discharge valve 4.

[0019] The side wall of the reactor body 1 is equipped with a cooling mechanism 5. The cooling mechanism 5 is used to cool the reaction solution inside the reactor body 1 during use. Compared with the existing method of setting coils in the reactor for cooling, the setting of the cooling mechanism 5 can increase the heat exchange area with the reactor body 1, thereby increasing the heat exchange capacity, better cooling the solution inside the reactor body 1, and accelerating the cooling rate inside the reactor body 1.

[0020] like Figure 2 As shown, the cooling mechanism 5 includes an upper cooling layer 51 and a lower cooling layer 52, which are integrally formed on the outer side wall of the reactor body 1. A first cooling chamber 53 is provided in the upper cooling layer 51, and a second cooling chamber 54 is provided in the lower cooling layer 52. The side walls of the upper cooling layer 51 and the lower cooling layer 52 are respectively fixedly connected to a liquid supply connector 55 and a liquid outlet connector 56 that communicate with the internal cooling chambers. Switch valves are fixedly installed in the liquid supply connector 55 and the liquid outlet connector 56, and the opening and closing of the liquid supply connector 55 and the liquid outlet connector 56 are controlled by the switch valves. The first cooling chamber 53 is spirally distributed in the side wall of the upper cooling layer 51. A heat exchange block 57 that penetrates to the bottom of the inner cavity of the reactor body 1 is embedded in the second cooling chamber 54. Cooling water is introduced into the upper cooling layer 51 and the lower cooling layer 52 respectively, and the reactor body 1 is cooled by circulating in the upper cooling layer 51 and the lower cooling layer 52.

[0021] like Figure 3 As shown, the heat exchange block 57 is arc-shaped and is evenly distributed around the center of the reactor body 1. The heat exchange block 57 is made of copper alloy material and has better heat exchange performance than the reactor body 1 during use. After being evenly distributed at the bottom of the inner cavity of the reactor body 1, it can accelerate the cooling of the reaction solution inside the reactor body 1 by the cooling water.

[0022] like Figure 5 As shown, the liquid supply connector 55 and the liquid outlet connector 56 are respectively connected to the cooling water circulation system. Cooling water is supplied from the cooling water cooling device to the first cooling chamber 53 and the second cooling chamber 54 by a water pump. After circulating in the first cooling chamber 53 and the second cooling chamber 54, it enters the cooling water cooling device for cooling and is reused. If the liquid supply connector 55 and the liquid outlet connector 56 are connected to the heating water circulation system, the heating operation of the reaction solution inside the reactor body 1 can be realized. Since this reactor is mainly used for the preparation of benzaldehyde, its main function during use is to cool the reaction solution. Therefore, only the cooling water circulation system is described as an example.

[0023] like Figure 2 and Figure 4 As shown, a stirring mechanism 6 is mounted on the top of the reactor body 1. By setting the stirring mechanism 6, the reaction solution inside the reactor body 1 can be better stirred and mixed. The stirring mechanism 6 includes a drive motor 61, which is fixedly mounted on the top of the reactor body 1. The drive motor 61 is electrically connected to an external power supply and an external controller. The external power supply supplies power to the drive motor 61, and the external controller can adjust the speed of the output end of the drive motor 61, thereby allowing the speed to be adjusted according to the reaction requirements during use. The output end of the drive motor 61 is fixedly connected to a drive shaft 62 that penetrates into the reactor body 1 via a coupling. A first stirring blade 63 and a second stirring blade 64 are evenly fixedly connected to the side wall of the drive shaft 62, and the first stirring blade 63 and the second stirring blade 64 are inclined in different directions. The rotation of the first stirring blade 63 and the second stirring blade 64 within the reactor body 1 driven by the drive shaft 62 can stir and mix the reaction solution. By setting the first stirring blade 63 and the second stirring blade 64 with opposite tilt directions, the reaction solution can generate vortices with different directions at different layer heights, thereby enhancing the stirring and mixing effect of the reaction solution.

[0024] like Figure 4 As shown, the sidewalls of the first stirring blade 63 and the second stirring blade 64 are uniformly provided with through holes 65. The through holes 65 cause the first stirring blade 63 and the second stirring blade 64 to generate fluid movement in the surrounding reaction solution during rotation, promoting the axial and radial flow of the reaction solution and accelerating the mixing efficiency of the reaction solution.

[0025] Working principle: This invention is mainly used for the preparation of benzaldehyde cyanohydrin. During use, benzaldehyde is added to the reactor body 1 through the feed pipe 2. Then, the solution in the reactor body 1 is cooled by the cooling mechanism 5. Cooling water is introduced into the first cooling chamber 53 and the second cooling chamber 54. Then, the stirring mechanism 6 is turned on and the stirring time is 10 minutes. Triethylamine is added to the reactor body 1. When the pH value is within a certain range, hydrogen cyanide is added dropwise. During this reaction, the temperature in the reactor is controlled at 5°C and the reaction time is 2 hours. During the 2-hour reaction, the stirring rate in the stirring mechanism 6 is 30 r / min. After the reaction is completed, concentrated sulfuric acid with a concentration of 75% is added. Finally, after the reaction is completed, the discharge valve 4 is opened to discharge the material in the reactor body 1 and filter it to obtain benzaldehyde cyanohydrin filtrate.

Claims

1. A reaction vessel for the preparation of benzaldehyde cyanohydrin, comprising a reaction vessel body (1), wherein a feed pipe (2) is fixedly mounted on the top of the reaction vessel body (1), and a discharge pipe (3) is fixedly mounted on the bottom of the reaction vessel body (1), wherein a discharge valve (4) is fixedly mounted inside the discharge pipe (3), characterized in that, The side wall of the reactor body (1) is equipped with a cooling mechanism (5), and the top of the reactor body (1) is fixedly equipped with a stirring mechanism (6). The cooling mechanism (5) includes a first cooling layer (51) and a second cooling layer (52). The first cooling layer (51) and the second cooling layer (52) are integrally formed on the side wall of the reactor body (1). The first cooling layer (51) and the second cooling layer (52) are respectively provided with a first cooling cavity (53) and a second cooling cavity (54). The first cooling cavity (53) and the second cooling cavity (54) are respectively fixedly connected with a liquid supply connector (55) and a liquid outlet connector (56). A heat exchange block (57) is embedded in the second cooling cavity (54).

2. The reaction vessel for the preparation of benzaldehyde cyanohydrin according to claim 1, characterized in that: The first cooling cavity (53) is spirally distributed within the first cooling layer (51).

3. The reaction vessel for the preparation of benzaldehyde cyanohydrin according to claim 1, characterized in that: The heat exchange blocks (57) are evenly distributed around the center of the reactor body (1).

4. The reaction vessel for the preparation of benzaldehyde cyanohydrin according to claim 1, characterized in that: The stirring mechanism (6) includes a drive motor (61), the output end of which is fixedly connected to a drive shaft (62) that extends through the inner cavity of the reactor body (1), and the side wall of the drive shaft (62) is fixedly connected to a first stirring blade (63) and a second stirring blade (64) that are evenly distributed in a circle.

5. The reaction vessel for the preparation of benzaldehyde cyanohydrin according to claim 4, characterized in that: The first stirring blade (63) and the second stirring blade (64) are inclined in opposite directions.

6. The reaction vessel for the preparation of benzaldehyde cyanohydrin according to claim 4, characterized in that: The sidewalls of the first stirring blade (63) and the second stirring blade (64) are respectively provided with through holes (65).

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