Temperature control device for trifluoroacetic acid production

Abstract

The utility model discloses a trifluoroacetic acid production temperature control device which comprises a reaction kettle, a material mixing barrel and a controller, stirring assemblies are arranged in the material mixing barrel and the reaction kettle, so that materials can react quickly after being added into the reaction kettle, and the preparation efficiency of trifluoroacetic acid is improved. A heating steam channel is arranged on the outer wall of the reaction kettle, a steam inlet is formed in the upper portion of one side of the heating steam channel, a cooling coil is arranged on the inner wall of the reaction kettle in a coiled mode, and the two ends of the cooling coil are communicated with an external water inlet pipe and an external water outlet pipe respectively. The reaction temperature is increased, and the reaction rate is accelerated. The cooling coil is coiled on the inner wall of the reaction kettle, the two ends of the cooling coil are communicated with the external water inlet pipe and the external water outlet pipe respectively, and when the temperature in the reaction kettle is too high, external cooling water is added into the cooling coil through the water inlet pipe, so that the reaction temperature is reduced, and the generation of byproducts is reduced.

Description

Technical Field

[0001] This utility model relates to the field of chemical production equipment technology, and in particular to a temperature control device for the production of trifluoroacetic acid. Background Technology

[0002] Trifluoroacetic acid is a colorless liquid with an odor similar to acetic acid, and it is highly hygroscopic and volatile. Unlike other organic acids, trifluoroacetic acid, after the introduction of fluoride ions, is influenced by the electron-withdrawing trifluoromethyl group, making it a strongly acidic organic acid. It is also a very important intermediate in the fluorochemical industry, widely used in pharmaceuticals, pesticides, fuels, and other chemical fields.

[0003] When producing trifluoroacetic acid using trichlorotrifluoroethane (CFC-113) and sulfur trioxide as the main raw materials via acylation hydrolysis, the acylation reaction proceeds under the action of a catalyst (chlorosulfonic acid) to generate trifluoroacetyl chloride and sulfonyl chloride. Currently, some equipment adds trichlorotrifluoroethane and sulfur trioxide separately to the reactor, requiring mixing and reaction simultaneously using the stirring components within the reactor, which reduces the production efficiency of trifluoroacetic acid. Simultaneously, the reaction temperature needs to be controlled between 50℃ and 100℃. Excessive temperature generates unnecessary byproducts, and the corrosiveness of sulfur trioxide increases at high temperatures, exacerbating corrosion of the reactor's inner wall. Conversely, excessively low temperatures significantly reduce the reaction rate, leading to prolonged reaction time and decreased production efficiency. Utility Model Content

[0004] The purpose of this application is to provide a temperature control device for the production of trifluoroacetic acid, in order to solve the problems of some current equipment that adds trichlorotrifluoroethane and sulfur trioxide separately to the reactor, requiring the use of a stirring component inside the reactor to mix them simultaneously, which reduces the production efficiency of trifluoroacetic acid; at the same time, the reaction temperature needs to be controlled between 50°C and 100°C. When the temperature is too high, unnecessary by-products will be generated, the corrosiveness of sulfur trioxide will increase at high temperatures, and the corrosion of the inner wall of the reactor will be aggravated. When the temperature is too low, the reaction rate will decrease significantly, resulting in a longer reaction time and reduced production efficiency.

[0005] To address the aforementioned technical problems, this application provides a temperature control device for trifluoroacetic acid production, comprising a reaction vessel, a mixing tank, and a controller. Both the mixing tank and the reaction vessel are equipped with a stirring assembly. A discharge pipe is connected to one side of the bottom of the mixing tank, and a feeding pump is installed on the discharge pipe. The other end of the discharge pipe is connected to a feeding tank, the bottom of which is connected to the reaction vessel via an inlet pipe. A catalyst storage tank is installed on one side of the top of the reaction vessel via a drip pipe. A heating steam channel is provided on the outer wall of the reaction vessel, and a steam inlet is opened on the upper part of one side of the heating steam channel. A cooling coil is mounted on the inner wall of the reaction vessel, with its two ends connected to an external water inlet pipe and a water outlet pipe, respectively. A temperature sensor is installed on the inner side of the bottom of the reaction vessel, and the temperature sensor is electrically connected to the controller.

[0006] Preferably, the agitation assembly includes a drive motor and a connecting shaft, the output shaft of the drive motor is connected to the connecting shaft, and agitation rods are evenly arranged on the connecting shaft.

[0007] Preferably, the feed pipe is equipped with a first flow meter and a first solenoid valve, both of which are electrically connected to the controller.

[0008] Preferably, the drip tube is equipped with a second flow meter and a second solenoid valve, both of which are electrically connected to the controller.

[0009] Preferably, a drain port is provided at the bottom of the heating steam passage on the side away from the steam inlet.

[0010] Preferably, the bottom of the reactor is provided with multiple support legs.

[0011] Compared with existing technologies, the temperature control device for trifluoroacetic acid production provided by this utility model includes a reaction vessel, a mixing tank, and a controller. Both the mixing tank and the reaction vessel are equipped with agitators. A discharge pipe is connected to one side of the bottom of the mixing tank, and a feed pump is installed on the discharge pipe. The other end of the discharge pipe is connected to a feeding tank, the bottom of which is connected to the reaction vessel via an inlet pipe. Trichlorotrifluoroethane and sulfur trioxide are added to the mixing tank in proportion. The agitator in the mixing tank agitates the two materials, and the feed pump transports the fully mixed reactants to the feeding tank, allowing for rapid reaction after the materials are added to the reaction vessel, thus improving the production efficiency of trifluoroacetic acid. A catalyst storage tank containing chlorosulfonic acid is installed on one side of the top of the reaction vessel via a dropper. The chlorosulfonic acid in the catalyst storage tank is added to the reaction vessel through the dropper to promote the conversion of the reactants. To facilitate temperature control, a temperature sensor is installed on the inner bottom of the reactor. This sensor is electrically connected to the controller and monitors the temperature inside the reactor, maintaining it between 50°C and 100°C. A heating steam channel is located on the outer wall of the reactor, with a steam inlet at the bottom. When the temperature inside the reactor is below 50°C, high-temperature steam is introduced into the heating steam channel through the steam inlet. The high-temperature steam exchanges heat with the reactants inside the reactor, increasing the reaction temperature and accelerating the reaction rate. A cooling coil is installed on the inner wall of the reactor, with its two ends connected to an external water inlet and outlet pipe, respectively. When the temperature inside the reactor becomes too high, external cooling water is added to the cooling coil through the inlet pipe, thereby lowering the reaction temperature and reducing the formation of byproducts. Attached Figure Description

[0012] To more clearly illustrate the technical solution of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0013] Figure 1 A three-dimensional structural diagram of a temperature control device for trifluoroacetic acid production provided by this utility model;

[0014] Figure 2 Internal structure diagram of a temperature control device for trifluoroacetic acid production provided by this utility model;

[0015] In the diagram: 1. Mixing tank; 2. Discharge pipe; 3. Feed pump; 4. Addition tank; 5. Feed pipe; 501. First flow meter; 502. First solenoid valve; 6. Catalyst storage tank; 7. Dropping pipe; 701. Second flow meter; 702. Second solenoid valve; 8. Reactor; 9. Stirring assembly; 901. Drive motor; 902. Connecting shaft; 903. Stirring rod; 10. Water inlet pipe; 11. Cooling coil; 12. Water outlet pipe; 13. Temperature sensor; 14. Steam inlet; 15. Heating steam channel; 16. Drain outlet; 17. Support leg; 18. Controller. Detailed Implementation

[0016] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.

[0017] The core of this application is to provide a temperature control device for the production of trifluoroacetic acid, which solves the problems of some current equipment that adds trichlorotrifluoroethane and sulfur trioxide separately to the reactor, requiring the use of a stirring component inside the reactor to mix them simultaneously, thus reducing the production efficiency of trifluoroacetic acid; at the same time, the reaction temperature needs to be controlled between 50℃ and 100℃. When the temperature is too high, unnecessary by-products will be generated, and the corrosiveness of sulfur trioxide will increase at high temperatures, exacerbating the corrosion of the inner wall of the reactor. When the temperature is too low, the reaction rate will decrease significantly, resulting in prolonged reaction time and reduced production efficiency.

[0018] Figure 1 This utility model provides a three-dimensional structural diagram of a temperature control device for trifluoroacetic acid production. Figure 2 An internal structural diagram of a temperature control device for trifluoroacetic acid production provided by this utility model is shown below. Figures 1 to 2 As stated above.

[0019] A temperature control device for trifluoroacetic acid production includes a reaction vessel 8, a mixing tank 1, and a controller 18. Both the mixing tank 1 and the reaction vessel 8 are equipped with a stirring component 9. Trichlorotrifluoroethane and sulfur trioxide are added to the mixing tank 1 in a specific ratio. The stirring component 9 ensures thorough mixing of the reactants, allowing for rapid reaction in the reaction vessel 8 and increasing the reaction rate. A discharge pipe 2 is connected to one side of the bottom of the mixing tank 1, and a feed pump 3 is installed on the discharge pipe 2. The other end of the discharge pipe 2 is connected to a feeding tank 4. The bottom of the feeding tank 4 is connected to the reaction vessel 8 via a feed pipe 5. After the reactants are thoroughly mixed in the mixing tank 1, the feed pump 3 is activated to transport the reactants to the feeding tank 4. To meet the needs of large-scale production, the reactants are added to the reaction vessel 8 in batches. Preferably, a first flow meter 501 and a first solenoid valve 502 are installed on the feed pipe 5. Each solenoid valve 502 is electrically connected to the controller 18. When reactants need to be added to the reactor 8, the first solenoid valve 502 is opened, and the reactants in the feeding tank 4 fall into the feed pipe 5 under gravity. They then enter the reactor 8 under the transport of the feed pipe 5. By setting the first flow meter 501, the incoming reactants can be monitored. When the predetermined value is reached, the first solenoid valve 502 will be closed by the controller 18 to achieve quantitative addition, prevent the reaction from being violently exothermic after a one-time addition, and make the reaction temperature easy to control.

[0020] A catalyst storage tank 6 is installed on one side of the top of the reactor 8 via a dripping pipe 7. To prevent excessive exothermic reaction and localized overheating caused by adding catalyst all at once, a second flow meter 701 and a second solenoid valve 702 are installed on the dripping pipe 7. Both the second flow meter 701 and the second solenoid valve 702 are electrically connected to a controller 18, which controls the slow or batch addition of catalyst into the reactor 8. Multiple support legs 17 are provided at the bottom of the reactor 8 to make it more stable and less prone to tipping over.

[0021] To better control the temperature inside the reactor 8, a temperature sensor 13 is installed on the inner bottom of the reactor 8. The temperature sensor 13 is electrically connected to the controller 18. The temperature sensor 13 detects the temperature inside the reactor 8, maintaining the reaction temperature between 50°C and 100°C. A heating steam channel 15 is provided on the outer wall of the reactor 8. A steam inlet 14 is located on the upper side of one side of the heating steam channel 15. When the temperature inside the reactor 8 is below 50°C, high-temperature steam is introduced into the heating steam channel 15 through the steam inlet 14. The high-temperature steam exchanges heat with the reactants inside the reactor 8, thereby increasing the reaction temperature and accelerating the reaction rate. Simultaneously, a cooling coil 11 is installed on the inner wall of the reactor 8. The two ends of the cooling coil 11 are connected to an external water inlet pipe 10 and a water outlet pipe 12, respectively. When the temperature inside the reactor 8 is too high, external cooling water is added to the cooling coil 11 through the water inlet pipe 10, thereby lowering the reaction temperature and reducing the formation of by-products.

[0022] In this embodiment, preferably, the stirring component includes a drive motor 901 and a connecting shaft 902. The output shaft of the drive motor 901 is connected to the connecting shaft 902. Stirring rods 903 are evenly arranged on the connecting shaft 902. In actual use, the drive motor 901 drives the connecting shaft 902 and the stirring rods 903 to rotate, so that the reactants and the catalyst are fully mixed and contacted, thereby accelerating the reaction rate.

[0023] Preferably, a drain port 16 is provided at the bottom of the heating steam channel 15 on the side away from the steam inlet 14. When the reaction temperature is too high, the drain port 16 is opened so that steam and condensate can be discharged through the drain port 16 to accelerate the cooling rate.

[0024] The temperature control device for trifluoroacetic acid production provided in this application works as follows: Trichlorotrifluoroethane and sulfur trioxide are added to a mixing tank 1 in a certain proportion. The agitator 9 is used to ensure that the reactants are fully mixed. After the reactants are fully mixed in the mixing tank 1, the feed pump 3 is started to transport the reactants to the feeding tank 4. The first solenoid valve 502 is opened, and part of the reactants in the feeding tank 4 falls into the feed pipe 5 under gravity. The reactants are transported into the reactor 8 by the feed pipe 5. The second solenoid valve 702 is opened, and part of the catalyst is added to the reactor 8. The drive motor 901 drives the connecting shaft 902 and the agitator 903 to rotate, so that the reactants and catalyst are fully mixed and in contact. High-temperature steam is introduced into the heating steam channel 15 through the steam inlet 14, and the temperature is raised to 50-70°C in 2 hours. Then the controller 18 controls the opening of the first solenoid valve 502 and the second solenoid valve 702, so that the reactants and catalyst are slowly and continuously added. During the reaction, the temperature is monitored by the temperature sensor 13. When the monitored temperature is higher than the range set by the user, the temperature sensor 13 feeds the data back to the controller 18. The controller 18 controls the external water pump to add cooling water into the cooling coil 11 through the water inlet pipe 10, thereby reducing the reaction temperature. At the same time, the drain port 16 is opened so that steam and condensate can be discharged through the drain port 16, which accelerates the cooling rate and reduces the generation of by-products.

[0025] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and incorporate common knowledge or customary techniques in the art disclosed herein. The specification and examples are to be considered exemplary only, and the true scope of this application is indicated by the claims.

[0026] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The embodiments of this application described above do not constitute a limitation on the scope of protection of this application.

Claims

1. A temperature control device for trifluoroacetic acid production, characterized by comprising: include: The reactor (8), mixing tank (1), and controller (18) are provided. Both the mixing tank (1) and the reactor (8) are equipped with stirring components (9). The bottom of the mixing tank (1) is connected to a discharge pipe (2), and a feeding pump (3) is installed on the discharge pipe (2). The other end of the discharge pipe (2) is connected to a feeding tank (4). The bottom of the feeding tank (4) is connected to the reactor (8) through a feed pipe (5). A catalyst is installed on the top side of the reactor (8) through a dripping pipe (7). The outer wall of the storage tank (6) and the reactor (8) is provided with a heating steam channel (15). A steam inlet (14) is opened on the upper side of one side of the heating steam channel (15). A cooling coil (11) is provided on the inner wall of the reactor (8). The two ends of the cooling coil (11) are connected to the external water inlet pipe (10) and the water outlet pipe (12) respectively. A temperature sensor (13) is provided on the inner side of the bottom of the reactor (8). The temperature sensor (13) is electrically connected to the controller (18).

2. The temperature control device for trifluoroacetic acid production according to claim 1, characterized by, The stirring assembly includes a drive motor (901) and a connecting shaft (902). The output shaft of the drive motor (901) is connected to the connecting shaft (902), and stirring rods (903) are evenly arranged on the connecting shaft (902).

3. The temperature control device for trifluoroacetic acid production according to claim 1, characterized by, The feed pipe (5) is equipped with a first flow meter (501) and a first solenoid valve (502), both of which are electrically connected to the controller (18).

4. The temperature control device for trifluoroacetic acid production according to claim 3, characterized by, The drip tube (7) is equipped with a second flow meter (701) and a second solenoid valve (702), both of which are electrically connected to the controller (18).

5. The temperature control device for trifluoroacetic acid production according to claim 1, characterized by, The heating steam channel (15) has a drain port (16) at the bottom of the side away from the steam inlet (14).

6. The temperature control device for trifluoroacetic acid production according to any one of claims 1 to 5, characterized by The bottom of the reactor (8) is provided with multiple support legs (17).

Images