Reaction device for intermittent catalytic synthesis of gamma-undecalactone

Abstract

The utility model discloses a reaction device for intermittently catalytically synthesizing gamma-undecalactone, which comprises a raw material mixing tank, a high-pressure reaction kettle, a gas absorption tank, a raw material feeding pipeline, a reaction product discharging pipeline, a catalyst feeding pipeline and a gas outlet pipeline, material holes are formed in the bottom of the coil pipe at intervals, one end of the raw material feeding pipeline extends into the raw material mixing tank, the other end of the raw material feeding pipeline extends into the high-pressure reaction kettle and is communicated with the coil pipe, one end of the reaction product discharging pipeline is communicated with the raw material feeding pipeline, and the other end of the reaction product discharging pipeline is a reactant discharging port. The catalyst feeding pipeline is vertically arranged and extends into the high-pressure reaction kettle from the outside of the high-pressure reaction kettle, one end of the gas outlet pipeline is communicated with the catalyst feeding pipeline, and the other end of the gas outlet pipeline extends into the gas absorption tank. The reaction device can effectively solve the problems that a cover needs to be opened when a catalyst is added, raw materials are not fed uniformly, and discharging at the bottom of the kettle is not thorough.

Description

Technical Field

[0001] The utility model relates to a kettle type reaction device, in particular to a reaction device for intermittent catalytic synthesis of gamma-undecalactone. Background Art

[0002] γ-Undecanolide is an important intermediate for medicine and fragrance. It can be prepared by catalytic reaction of n-octanol and acrylic acid. At present, the reaction usually prepares γ-undecalactone by adding n-octanol, acrylic acid and catalyst into a reactor at the same time for mixed reaction. However, if a traditional high-pressure reactor is used for preparation, there are the following disadvantages: 1. Since the catalyst (di-tert-butyl peroxide) is in a viscous liquid state, the lid needs to be opened each time the raw material is injected; 2. The reaction is a rapid reaction, and acrylic acid polymerization may easily occur due to uneven feeding; 3. The reaction product is taken out from a single discharge pipe, and the bottom material may not be completely extracted.

[0003] Therefore, how to avoid opening the lid when feeding, ensure uniform feeding, and avoid incomplete discharge from the bottom of the kettle has become a problem that needs to be solved urgently. Utility Model Content

[0004] In view of this, the purpose of the utility model is to provide a reaction device for intermittent catalytic synthesis of γ-undecalactone to solve at least one of the problems of needing to open the cover for adding catalyst, uneven raw material feeding and incomplete discharge from the bottom of the kettle.

[0005] The technical scheme provided by the utility model is: a reaction device for intermittent catalytic synthesis of γ-undecalactone, comprising: a raw material mixing tank, a high-pressure reactor, a gas absorption tank, a raw material feeding pipeline, a reaction product discharging pipeline, a catalyst feeding pipeline and a gas outlet pipeline, wherein the high-pressure reactor comprises a reactor body, a reactor cover and a stirring device, a coil is arranged at the bottom of the reactor body, and material holes are arranged at intervals at the bottom of the coil, the reactor cover is mounted on the reactor body, the stirring device is mounted on the reactor cover, and is used to stir the reactants in the reactor body, one end of the raw material feeding pipeline extends into the raw material mixing tank, and the other end extends into the high-pressure reactor and is connected to the coil, and the raw material feeding pipeline is provided with a plurality of holes. A raw material metering pump, a check valve and a first ball valve are sequentially arranged along the feed direction; one end of the reaction product discharge pipeline is connected to the raw material feed pipeline between the check valve and the first ball valve, and the other end is a reactant discharge port; a second ball valve is arranged on the reaction product discharge pipeline; the catalyst feed pipeline is vertically arranged and extends from the outside of the high-pressure reactor into the high-pressure reactor; a funnel is installed on the top of the catalyst feed pipeline; a third ball valve and a fourth ball valve are arranged on the catalyst feed pipeline at intervals from top to bottom; one end of the gas outlet pipeline is connected to the catalyst feed pipeline between the third ball valve and the fourth ball valve, and the other end extends into the gas absorption tank; a fifth ball valve is arranged on the gas outlet pipeline.

[0006] Preferably, the stirring device comprises a motor, a stirring rod and a stirring paddle, wherein the motor is fixedly arranged, the stirring rod is connected to the output shaft of the motor and extends into the kettle body, and the stirring paddle is installed on the stirring rod and is located in the kettle body.

[0007] Further preferably, the reaction device for intermittent catalytic synthesis of γ-undecalactone further comprises a pressure detection device and a temperature detection device installed on the kettle cover, and the pressure detection device and the temperature detection device are used to detect the pressure and temperature in the kettle body, respectively.

[0008] Further preferably, the side wall of the kettle body is also provided with a heating jacket.

[0009] More preferably, the coil is in a spiral or concentric circle shape.

[0010] Further preferably, the material holes are evenly arranged at the bottom of the coil.

[0011] The reaction device for intermittent catalytic synthesis of γ-undecalactone provided by the utility model reduces the high-pressure covering holes and increases the airtightness of the device by reasonably matching pipelines; the catalyst feed pipeline is arranged so that the liquid catalyst can be directly added without opening the kettle cover; the use of coils can make the raw material feed evenly distributed and the discharge more thorough, avoiding opening the kettle cover to clean the reactor. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The present invention is further described in detail below with reference to the accompanying drawings and implementation modes:

[0013] Figure 1 A schematic diagram of the structure of a reaction device for intermittent catalytic synthesis of γ-undecalactone provided by the utility model;

[0014] Figure 2 Schematic diagram of the structure of the spiral coil. DETAILED DESCRIPTION

[0015] The present invention will be further explained below in conjunction with specific implementation schemes, but the present invention is not limited thereto.

[0016] like Figure 1As shown, the utility model provides a reaction device for intermittent catalytic synthesis of γ-undecalactone, comprising: a raw material mixing tank 1, a high-pressure reactor, a gas absorption tank 22, a raw material feeding pipeline 23, a reaction product discharging pipeline 24, a catalyst feeding pipeline 25 and a gas outlet pipeline 19, wherein the high-pressure reactor comprises a reactor body 15, a reactor cover 21 and a stirring device, a coil 7 is arranged at the bottom of the reactor body 15, and a material hole 8 is arranged at intervals at the bottom of the coil 7, the reactor cover 21 is mounted on the reactor body 15, and the stirring device is mounted on the reactor cover 21 for stirring the reactants in the reactor body 15, one end of the raw material feeding pipeline 23 extends into the raw material mixing tank 1, and the other end extends into the high-pressure reactor and is connected to the coil 7, and the raw material feeding pipeline 23 is connected along the feeding direction A raw material metering pump 2, a check valve 3 and a first ball valve 6 are sequentially arranged, one end of the reaction product discharge pipeline 24 is connected to the raw material feed pipeline 23 between the check valve 3 and the first ball valve 6, and the other end is a reactant discharge port, a second ball valve 4 is arranged on the reaction product discharge pipeline 24, the catalyst feed pipeline 25 is vertically arranged and extends from the outside of the high-pressure reactor into the high-pressure reactor, a funnel 17 is installed on the top of the catalyst feed pipeline 25, a third ball valve 16 and a fourth ball valve 20 are arranged on the catalyst feed pipeline 25 from top to bottom, one end of the gas outlet pipeline 19 is connected to the catalyst feed pipeline 25 between the third ball valve 16 and the fourth ball valve 20, and the other end extends into the gas absorption tank 22, and a fifth ball valve 18 is arranged on the gas outlet pipeline 19.

[0017] The working principle of the reaction device for intermittent catalytic synthesis of γ-undecalactone is as follows: a mixed organic raw material of n-octanol and acrylic acid is stored in a raw material mixing tank, and a gas absorption liquid (such as water) is stored in a gas absorption tank. First, the check valve and the first ball valve are opened, and the second ball valve is closed. The mixed organic raw material is quantitatively transported to the kettle body through the raw material feed pipeline and the coil by the raw material metering pump. The third ball valve and the fourth ball valve are opened, and the fifth ball valve is closed. The liquid catalyst is added to the kettle body through the catalyst feed pipeline through the conical funnel to avoid the need to open the cover every time the material is added. After that, the relevant valves are closed, and the raw materials are catalytically reacted in the kettle body to synthesize γ-undecalactone. During the reaction, the stirring device is stirred. After the reaction is completed, the first ball valve is opened. The first valve, the second ball valve, the fourth ball valve, and the fifth ball valve complete the discharge of the reaction product through the coil, the raw material feed pipeline and the reaction product discharge pipeline, wherein the raw material feed and the reaction product discharge share a part of the pipeline, which can reduce one hole position on the kettle cover, and the unreacted gas will enter the gas absorption tank through the catalyst feed pipeline and the gas outlet pipeline and be absorbed by the gas absorption liquid to prevent the gas from being discharged to the outside, wherein the catalyst feed and the gas discharge share a part of the pipeline, which can also reduce one hole position on the kettle cover, the coil and the material holes arranged at the bottom of the coil can realize uniform feeding of the raw materials and prevent polymerization due to excessive raw material concentration. At the same time, the material holes arranged at the bottom of the coil can ensure that the product at the bottom of the kettle is completely extracted to prevent the product from remaining at the bottom of the kettle and opening the cover for cleaning.

[0018] As an improvement of the technical solution, Figure 1 As shown, the stirring device includes a motor 11, a stirring rod 12 and a stirring paddle 13, wherein the motor 11 is fixedly arranged, the stirring rod 12 is connected to the output shaft of the motor 11 and extends into the kettle body 15, and the stirring paddle 13 is installed on the stirring rod 12 and is located in the kettle body 15.

[0019] As an improvement of the technical solution, Figure 1 As shown, the reaction device for intermittent catalytic synthesis of γ-undecalactone also includes a pressure detection device 9 and a temperature detection device 10 installed on the kettle cover 21, and the pressure detection device 9 and the temperature detection device 10 are used to detect the pressure and temperature in the kettle body 15 respectively.

[0020] As an improvement of the technical solution, Figure 1 As shown, the side wall of the kettle body 15 is also provided with a heating jacket 14 .

[0021] As an improvement of the technical solution, the coil 7 is spiral (such as Figure 2 as shown) or concentric circles (as shown Figure 1 As shown in the figure), when the coil is in the shape of concentric circles, the circular tubes in adjacent circles are connected through connecting tubes.

[0022] As an improvement of the technical solution, the material holes 8 are evenly arranged at the bottom of the coil 7 .

[0023] The specific implementation methods of the present utility model are written in a progressive manner, emphasizing the differences between the various implementation methods, and the similar parts thereof can be referenced to each other.

[0024] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in this field without departing from the purpose of the present invention.

Claims

1. A reaction device for intermittent catalytic synthesis of γ-undecalactone, characterized in that: include: A raw material mixing tank (1), a high-pressure reactor, a gas absorption tank (22), a raw material feeding pipeline (23), a reaction product discharging pipeline (24), a catalyst feeding pipeline (25) and a gas outlet pipeline (19), wherein the high-pressure reactor comprises a reactor body (15), a reactor cover (21) and a stirring device, a coil (7) is arranged at the bottom of the reactor body (15), and material holes (8) are arranged at intervals at the bottom of the coil (7), the reactor cover (21) is mounted on the reactor body (15), and the stirring device is mounted on the reactor cover (21) and is used to stir the reactants in the reactor body (15), one end of the raw material feeding pipeline (23) extends into the raw material mixing tank (1), and the other end extends into the high-pressure reactor and is connected to the coil (7), and a raw material metering pump (2), a check valve ( 3) and a first ball valve (6), one end of the reaction product discharge pipeline (24) is connected to the raw material feed pipeline (23) between the check valve (3) and the first ball valve (6), and the other end is a reactant discharge port, a second ball valve (4) is arranged on the reaction product discharge pipeline (24), the catalyst feed pipeline (25) is arranged vertically and extends from the outside of the high-pressure reactor into the high-pressure reactor, a funnel (17) is installed on the top of the catalyst feed pipeline (25), and a third ball valve (16) and a fourth ball valve (20) are arranged on the catalyst feed pipeline (25) from top to bottom, one end of the gas outlet pipeline (19) is connected to the catalyst feed pipeline (25) between the third ball valve (16) and the fourth ball valve (20), and the other end extends into the gas absorption tank (22), and a fifth ball valve (18) is arranged on the gas outlet pipeline (19).

2. The reaction device for intermittent catalytic synthesis of γ-undecalactone according to claim 1, characterized in that: The stirring device comprises a motor (11), a stirring rod (12) and a stirring paddle (13), wherein the motor (11) is fixedly arranged, the stirring rod (12) is connected to the output shaft of the motor (11) and extends into the kettle body (15), and the stirring paddle (13) is mounted on the stirring rod (12) and is located in the kettle body (15).

3. The reaction device for intermittent catalytic synthesis of γ-undecalactone according to claim 1, characterized in that: It also comprises a pressure detection device (9) and a temperature detection device (10) installed on the kettle cover (21), wherein the pressure detection device (9) and the temperature detection device (10) are used to detect the pressure and temperature in the kettle body (15), respectively.

4. The reaction device for intermittent catalytic synthesis of γ-undecalactone according to claim 1, characterized in that: The side wall of the kettle body (15) is also provided with a heating jacket (14).

5. The reaction device for intermittent catalytic synthesis of γ-undecalactone according to claim 1, characterized in that: The coil (7) is in a spiral shape or a concentric circle shape.

6. The reaction device for intermittent catalytic synthesis of γ-undecalactone according to claim 1, characterized in that: The material holes (8) are evenly arranged at the bottom of the coil (7).

Images