Solvent separation system for producing trifluoroacetic acid

Abstract

The utility model relates to the technical field of trifluoroacetic acid processing, and discloses a solvent separation system for trifluoroacetic acid production. The first-stage extraction tanks and the second-stage extraction tanks are arranged, and one second-stage extraction tank corresponds to a plurality of first-stage extraction tanks, so that in the extraction layering process of the plurality of first-stage extraction tanks, liquid at a part of boundary lines can be fed into the second-stage extraction tanks to be extracted again, on one hand, continuous operation of the whole equipment is guaranteed, and on the other hand, the extraction efficiency is improved; on the other hand, the purity of the extracted finished product is improved. The liquid outlet pipe is respectively connected with the first discharge pipe, the second discharge pipe and the first pipeline to respectively correspond to the lower-layer liquid, the liquid at the middle interface and the upper-layer liquid of the first extraction tank, and the liquid is respectively drained into the first liquid collecting tank, the second liquid collecting tank and the material collecting tank.

Description

Technical Field

[0001] This application relates to the field of trifluoroacetic acid processing technology, specifically to a solvent separation system for the production of trifluoroacetic acid. Background Technology

[0002] Trifluoroacetic acid (C2HF3O2) is an organic compound primarily used as a reagent, solvent, catalyst, and in organic synthesis. The production of trifluoroacetic acid requires fractionation, which can be achieved through various methods such as single-tower distillation, double-tower pressure swing distillation, reverse osmosis membrane separation, and liquid-liquid extraction. The choice of fractionation method depends on factors such as the required purity of the solution.

[0003] Regarding the form of liquid-liquid extraction splitting, the existing splitting methods have the problem of low splitting efficiency, requiring repeated extraction, and are prone to gas leakage during the separation process, posing a safety hazard. Utility Model Content

[0004] In view of the above problems, this application provides a solvent separation system for the production of trifluoroacetic acid, which can improve the separation efficiency and achieve higher separation accuracy of trifluoroacetic acid.

[0005] According to one aspect of the embodiments of this application, a solvent separation system for producing trifluoroacetic acid is provided. The solvent separation system for producing trifluoroacetic acid includes a mounting support frame, a raw material conveying pipe disposed at the mounting support frame, a plurality of primary extraction tanks and a secondary extraction tank fixedly disposed on one side of the mounting support frame, and a collection tank disposed on the side of the mounting support frame opposite to the plurality of primary extraction tanks. The bottom of each of the primary and secondary extraction tanks is connected to an outlet pipe, the middle of which is connected to a first pipe. The other end of the first pipe is connected to the upper end of the collection tank via a water pump and a pipe. The bottom of the outlet pipe is connected to a first discharge pipe and a second discharge pipe via a three-way valve. The plurality of first discharge pipes are connected to a first collection tank, and the plurality of second discharge pipes are connected to a second collection tank. The top of the secondary extraction tank is connected to the second collection tank via a metering pump and a reflux pipe, and the tops of the plurality of primary extraction tanks are respectively connected to the raw material conveying pipe via metering pumps and pipes.

[0006] In some embodiments, an extractant storage tank is fixedly installed on the top of the mounting support frame, and a ventilation box is installed on the top of the extractant storage tank. The tops of the primary extraction tank and the secondary extraction tank are connected to a multi-purpose pipe. The top of the multi-purpose pipe branches into a second pipe and a third pipe. The second pipe is connected to the bottom of the extractant storage tank through a metering valve, and the third pipe is connected to one side of the ventilation box.

[0007] In some embodiments, the top of the ventilation box is provided with a plurality of ventilation grilles, and a dust filter bag is provided inside the ventilation grille.

[0008] In some embodiments, an extractant addition tube is provided on one side of the extractant storage tank.

[0009] In some embodiments, the first liquid collection tank and the second liquid collection tank are respectively connected to the air exchange box via pipes.

[0010] In some embodiments, the bottom of both the primary extraction tank and the secondary extraction tank is funnel-shaped.

[0011] In some embodiments, a discharge valve is provided at one end of the first liquid collection tank.

[0012] In some embodiments, the secondary extraction tank is fixed to the middle of one side of the mounting support frame, and a plurality of primary extraction tanks are symmetrically arranged on both sides of the secondary extraction tank.

[0013] The beneficial effects of this application are as follows: By setting up a primary extraction tank and a secondary extraction tank, with one secondary extraction tank corresponding to multiple primary extraction tanks, the liquid at the boundary between the primary and secondary extraction tanks can be sent to the secondary extraction tank for further extraction during the extraction and stratification process. This ensures the continuous operation of the entire equipment and improves the purity of the finished product after extraction. In this application, the first discharge pipe, the second discharge pipe, and the first pipeline are connected to the liquid outlet pipe to respectively correspond to the lower layer liquid, the liquid at the intermediate boundary, and the upper layer liquid in the first extraction tank, and are respectively guided to the first collection tank, the second collection tank, and the collection tank. This application features a compact structure, convenient installation, and low cost.

[0014] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0015] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0016] Figure 1 This is a schematic diagram of the overall structure of the solvent separation system for producing trifluoroacetic acid provided in the embodiments of this application;

[0017] Figure 2A partial structural diagram of the primary extraction tank and its connecting structure provided in an embodiment of this application;

[0018] Figure 3 for Figure 2 A structural diagram from another perspective.

[0019] The reference numerals in the detailed embodiments are as follows:

[0020] A solvent separation system 100 for producing trifluoroacetic acid includes a support frame 110, a raw material conveying pipeline 111, a primary extraction tank 120, a liquid outlet pipe 121, a first pipeline 122, a three-way valve 123, a first discharge pipe 124, a second discharge pipe 125, a multi-purpose pipe 126, a second pipeline 127, a third pipeline 128, a secondary extraction tank 130, a reflux pipe 131, a collection tank 140, a first liquid collection tank 150, a discharge valve 151, a second liquid collection tank 160, an extractant storage tank 170, a ventilation box 180, and a ventilation grid 181. Detailed Implementation

[0021] The embodiments of the technical solution of this application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of this application, and are therefore merely examples and should not be used to limit the scope of protection of this application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this application; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and the foregoing description of the accompanying drawings are intended to cover non-exclusive inclusion.

[0022] For details, please refer to Figures 1 to 3 , Figure 1 This is a schematic diagram of the overall structure of the solvent separation system for producing trifluoroacetic acid provided in the embodiments of this application. Figure 2 This is a partial structural diagram of the primary extraction tank and its connecting structure provided in an embodiment of this application. Figure 3 for Figure 2A structural schematic diagram from another perspective. The solvent separation system 100 for producing trifluoroacetic acid includes a mounting support frame 110, which supports and mounts the other components. Its shape can be customized according to actual needs and will not be elaborated here. It should be noted that the material of the mounting support frame 110 should be corrosion-resistant. A raw material conveying pipe 111 is provided at the mounting support frame 110 for conveying the trifluoroacetic acid mixture. Multiple primary extraction tanks 120 and one secondary extraction tank 130 are fixedly mounted on one side of the mounting support frame 110. The bottoms of both the primary and secondary extraction tanks 120 and 130 are funnel-shaped. The secondary extraction tank 130 is fixed to the middle of one side of the mounting support frame 110, and the multiple primary extraction tanks are symmetrically arranged on both sides of the secondary extraction tank 130. Both the primary extraction tank 120 and the secondary extraction tank 130 can be constructed using existing extraction tanks. The primary extraction tank 120 and the secondary extraction tank 130 are structurally similar, but their functions differ. The raw material for the primary extraction tank 120 comes from the raw material conveying pipe 111, while the raw material for the secondary extraction tank 130 comes from the middle layer liquid separated during the primary extraction tank 120. A collection tank 140 is installed on the side of the mounting support frame 110 opposite to the multiple primary extraction tanks 120. The collection tank 140 is used to store the upper layer liquid in the extraction tanks. The bottom of both the primary extraction tank 120 and the secondary extraction tank 130 is connected to an outlet pipe 121. The middle of the outlet pipe 121 is connected to a first pipe 122. The other end of the first pipe 122 is connected to the upper end of the collection tank 140 via a water pump (not shown in the figure) and a pipe. Through the arrangement of the outlet pipe 121 and the opening and closing of the valve, the liquid in the primary extraction tank 120 and the secondary extraction tank 130 can be pumped to the collection tank 140. The bottom of the outlet pipe 121 is connected to a first discharge pipe 124 and a second discharge pipe 125 via a three-way valve 123. Multiple first discharge pipes 124 are connected to a first collection tank 150, which collects the bottom liquid after stratification in the extraction tank. Multiple second discharge pipes 125 are connected to a second collection tank 160, which collects the middle liquid in the stratified phase of the extraction tank. The top of the secondary extraction tank 130 is connected to the second collection tank 160 via a metering pump and a return pipe 131. The liquid in the second collection tank 160 can be pumped back to the secondary extraction tank 130 for extraction via the metering pump and the return pipe 131. The tops of multiple primary extraction tanks 120 are connected to a raw material conveying pipe 111 via metering pumps and pipes. The raw material in the raw material conveying pipe 111 can be conveyed to the primary extraction tank 120 via the metering pumps and pipes.

[0023] In this embodiment, the working process is as follows: the metering pump at the top of the primary extraction tank 120 is turned on, and a metered amount of trifluoroacetic acid mixture is delivered into the primary extraction tank 120. Extractant is added and the mixture is allowed to stand. After the liquid inside the primary extraction tank 120 separates into layers, the valve at the bottom of the primary extraction tank 120 is opened. The liquid at the bottom of the primary extraction tank 120 will sequentially enter the first collection tank 150 through the outlet pipe 121 and the first discharge pipe 124. (Note that the layering position of the product and by-product may change depending on the type of extractant added; therefore, the first collection tank is omitted here for clarity.) (The default is to collect the finished trifluoroacetic acid). When the lower layer solution is about to be completely discharged from the primary extraction tank 120, adjust the valve body so that the liquid in the outlet pipe 121 flows into the second collection tank 160 through the second discharge pipe 125 (the liquid at the interface has lower purity, so it is sent to the second collection tank 160 for secondary extraction). After a period of time, turn on the first pipe 122 and the water pump at the first pipe 122 and close the valve body of the outlet pipe 121 located below the first pipe 122. At this time, the upper layer liquid in the primary extraction tank 120 will be transported to the collection tank 140 for storage. Then, turn on the metering pump at the top of the primary extraction tank 120 again to feed the liquid. At the same time, turn on the metering pump at the top of the secondary extraction tank 130 to draw the mixed liquid collected in the second collection tank 160 back into the secondary extraction tank 130 through the return pipe 131 for extraction. The working process of the secondary extraction tank 130 can refer to the working process of the primary extraction tank 120. This cycle can be used to continuously complete the extraction of trifluoroacetic acid.

[0024] As can be seen from the above, in this embodiment, by setting up a primary extraction tank 120 and a secondary extraction tank 130, with one secondary extraction tank 130 corresponding to multiple primary extraction tanks 120, the liquid at the boundary of some of the primary extraction tanks 120 can be sent to the secondary extraction tank 130 for further extraction during the extraction and stratification process. This ensures the continuous operation of the entire equipment and improves the purity of the finished product after extraction. In this application, by connecting the first discharge pipe 124, the second discharge pipe 125, and the first pipe 122 at the liquid outlet pipe 121, the liquid at the middle boundary and the liquid at the upper layer of the primary extraction tank 120 are respectively connected, and the liquid is guided to the first collection tank 150, the second collection tank 160 and the collection tank 140 respectively.

[0025] In some embodiments, an extractant storage tank 170 is fixedly installed on the top of the mounting support frame 110, and a ventilation box 180 is installed on the top of the extractant storage tank 170. The tops of both the primary extraction tank and the secondary extraction tank 130 are connected to a multi-purpose pipe 126. The top of the multi-purpose pipe 126 branches into a second pipe 127 and a third pipe 128. The second pipe 127 is connected to the bottom of the extractant storage tank 170 via a metering valve, and the third pipe 128 is connected to one side of the ventilation box 180. In this embodiment, with the above configuration, the extractant can be transported to the primary extraction tank 120 or the secondary extraction tank 130 via the second pipe 127 and the metering valve installed on the second pipe 127. After the extractant is transported, the multi-purpose pipe 126 will be connected to the ventilation box 180, thereby facilitating the maintenance of the internal air pressure of the primary extraction tank 120.

[0026] In some embodiments, a plurality of ventilation grilles 181 are provided on the top of the ventilation box 180, and a dust filter bag is provided inside the ventilation grille 181. In this embodiment, with the above arrangement, the exhaust gas can be discharged into the atmosphere through the ventilation grille 181 after being absorbed by the liquid inside the ventilation box 180, and the dust filter bag can prevent external impurities from entering the interior of the ventilation box 180.

[0027] In some embodiments, an extractant addition pipe is provided on one side of the extractant storage tank 170. In this embodiment, the extractant addition pipe is used to supply extractant into the extractant storage tank 170.

[0028] In some embodiments, the first liquid collection tank 150 and the second liquid collection tank 160 are respectively connected to the ventilation box 180 via pipes (the pipes between the first liquid collection tank 150, the second liquid collection tank 160, and the ventilation box 180 are not shown in the diagram). In this embodiment, the above arrangement ensures stable air pressure in the first liquid collection tank 150 and the second liquid collection tank 160.

[0029] In some embodiments, a discharge valve 151 is provided at one end of the first liquid collection tank 150. In this embodiment, the discharge valve 151 facilitates the discharge of liquid from the first liquid collection tank 150.

[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although the foregoing embodiments have provided a detailed description of this application, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A solvent separation system for the production of trifluoroacetic acid, characterized in that, The system includes a support frame, a raw material conveying pipe at the support frame, multiple primary extraction tanks and one secondary extraction tank fixedly mounted on one side of the support frame, and a collection tank mounted on the side of the support frame away from the multiple primary extraction tanks. The bottom of each of the primary and secondary extraction tanks is connected to an outlet pipe. The middle of the outlet pipe is connected to a first pipe. The other end of the first pipe is connected to the upper end of the collection tank via a water pump and a pipe. The bottom of the outlet pipe is connected to a first discharge pipe and a second discharge pipe via a three-way valve. Multiple first discharge pipes are connected to a first collection tank, and multiple second discharge pipes are connected to a second collection tank. The top of the secondary extraction tank is connected to the second collection tank via a metering pump and a reflux pipe. The tops of the multiple primary extraction tanks are connected to the raw material conveying pipe via metering pumps and pipes.

2. The solvent separation system for producing trifluoroacetic acid according to claim 1, characterized in that, An extractant storage tank is fixedly installed on the top of the mounting support frame. A ventilation box is installed on the top of the extractant storage tank. The tops of the primary extraction tank and the secondary extraction tank are connected to a multi-purpose pipe. The top of the multi-purpose pipe branches into a second pipe and a third pipe. The second pipe is connected to the bottom of the extractant storage tank through a metering valve, and the third pipe is connected to one side of the ventilation box.

3. The solvent separation system for producing trifluoroacetic acid according to claim 2, characterized in that, The top of the ventilation box is provided with multiple ventilation grilles, and dust filter bags are installed inside the ventilation grilles.

4. The solvent separation system for producing trifluoroacetic acid according to claim 2, characterized in that, An extractant addition tube is provided on one side of the extractant storage tank.

5. The solvent separation system for producing trifluoroacetic acid according to claim 2, characterized in that, The first liquid collection tank and the second liquid collection tank are respectively connected to the air exchange box through pipes.

6. The solvent separation system for producing trifluoroacetic acid according to claim 1, characterized in that, The bottoms of both the primary extraction tank and the secondary extraction tank are funnel-shaped.

7. The solvent separation system for producing trifluoroacetic acid according to claim 1, characterized in that, A discharge valve is provided at one end of the first liquid collection tank.

8. The solvent separation system for producing trifluoroacetic acid according to claim 1, characterized in that, The secondary extraction tank is fixed to the middle of one side of the mounting support frame, and multiple primary extraction tanks are symmetrically arranged on both sides of the secondary extraction tank.

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