An adsorption apparatus for producing hexafluoropropylene

Abstract

The utility model discloses a kind of production hexafluoropropene's adsorption device, including adsorption cabinet, the adsorption cabinet one end opening, the other end is closed, opening end is equipped with detachable lid;The inside of the adsorption cabinet is equipped with rotatable rotary drum, the rotary drum both ends are respectively provided with first pivot and second pivot, first pivot is connected with lid, second pivot is connected with the closed end of adsorption cabinet;In the rotary drum is located in the closed end of adsorption cabinet one end and is provided with hexafluoropropene crude product entrance, hexafluoropropene outlet that is connected with adsorption cabinet 1 is equipped on lid;The body of the rotary drum is distributed with small hole.The device provided by the utility model is simple in structure, the rotation of rotary drum can improve adsorption effect, and the replacement of the rotary drum is simple and rapid, the replaced rotary drum is transported to a safe place, and then the adsorbent is replaced, to ensure the safety and environmental protection of production environment, without causing pollution to environment, suitable for the advantages of large-scale production.

Description

Technical Field

[0001] This utility model relates to the technical field of hexafluoropropylene production, specifically to an adsorption device for producing hexafluoropropylene. Background Technology

[0002] Hexafluoropropylene is a crucial raw material in the organofluorine industry, serving as a comonomer for various fluoropolymers. It is used in the production of fluorinated materials such as fluororubber and fluoroplastics, and is also an intermediate for a wide range of fluorinated fine chemicals and pharmaceuticals. Increasing the production scale and innovating its technology are essential for driving the development of the entire fluorochemical industry. Currently, hexafluoropropylene is mainly produced by cracking difluorochloromethane, which generates tetrafluoroethylene and perfluorocyclobutane. After the cracking reaction, rapid cooling is performed. Because the reaction products contain hydrogen fluoride and moisture, adsorbents are needed for acid removal and drying. However, during adsorption, the moisture, hydrogen fluoride, and various polyfluorocarbons quickly degrade the adsorbent, necessitating its replacement. Currently, hexafluoropropylene production requires two adsorption units. While this doesn't disrupt normal production, it is space-consuming, and the direct replacement of the adsorbent in the production workshop (requiring the removal of the adsorbent from the unit) poses significant risks to production safety and environmental pollution. Therefore, a single adsorption unit is urgently needed to achieve safe and environmentally friendly production. Summary of the Invention

[0003] The technical problem to be solved by this utility model is to provide an adsorption device for producing hexafluoropropylene. This device can not only ensure the continuous and normal operation of the preparation reaction, but also improve the replacement efficiency of the adsorbent and achieve safe and environmentally friendly production.

[0004] To solve the above technical problems, this utility model discloses an adsorption device for producing hexafluoropropylene. The device includes an adsorption cabinet with one open end and the other closed end, and a removable cover is installed at the open end. A rotatable rotating drum is installed inside the adsorption cabinet. A first rotating shaft and a second rotating shaft are respectively provided at both ends of the rotating drum. The first rotating shaft is connected to the cover, and the second rotating shaft is connected to the closed end of the adsorption cabinet. A crude hexafluoropropylene inlet is provided at the closed end of the rotating drum, and a hexafluoropropylene outlet communicating with the adsorption cabinet is provided on the cover. Small holes are distributed around the rotating drum for discharging the adsorbed hexafluoropropylene.

[0005] Furthermore, a pressure pump is installed at the hexafluoropropylene outlet (on the hexafluoropropylene outlet pipe) to extract the adsorbed hexafluoropropylene from the adsorption cabinet and transport it to the distillation unit for distillation purification.

[0006] Furthermore, the adsorption cabinet adopts a cylindrical structure.

[0007] Furthermore, the rotating drum is filled with an adsorbent, which is anhydrous calcium chloride, calcium oxide, and aluminum oxide.

[0008] Furthermore, a pivot bracket is provided on the inner side of the cover, and a pivot locking hole is provided at the center of the pivot bracket, into which the first pivot is locked.

[0009] Furthermore, the pivot bracket has a panel structure, with the periphery of the panel fixed to the cover, and the hexafluoropropylene outlet connected to the panel.

[0010] Furthermore, the pivot bracket is fixed to the cover by several support rods around the pivot snap hole, the outer side of the cover is an arc surface, and the hexafluoropropylene outlet is connected to the center of the cover.

[0011] Furthermore, the second rotating shaft is driven to rotate by a motor, with one end detachably connected to the rotating drum and the other end fixed to the closed end of the adsorption cabinet; or one end is fixedly connected to the rotating drum and the other end is detachably connected to the closed end of the adsorption cabinet.

[0012] Furthermore, the adsorption cabinet and lid are made of stainless steel or polytetrafluoroethylene, and the rotating roller is made of polytetrafluoroethylene.

[0013] The beneficial effects of this invention are as follows: The device has a simple structure; the rotation of the rotating drum improves the adsorption effect; and the replacement of the rotating drum is simple and quick (only two to three minutes). The replaced rotating drum is transported to a safe place before the adsorbent is replaced, ensuring a safe and environmentally friendly production environment and preventing pollution. It is suitable for large-scale production. In other words, this invention ensures the normal and continuous production of hexafluoropropylene while also improving the efficiency of adsorbent replacement. Attached Figure Description

[0014] Figure 1 This is a front sectional view of the device of this utility model;

[0015] Figure 2 This is a cross-sectional view of the device of this utility model;

[0016] Figure 3 This is a cross-sectional view of Example 1;

[0017] Figure 4 This is a front sectional view of Example 2;

[0018] Figure 5 This is a cross-sectional view of Example 2.

[0019] In the diagram: 1. Adsorption cabinet; 2. Cover; 3. Rotating drum; 4. Small hole; 5. Adsorbent; 6.1. First rotating shaft; 6.2. Second rotating shaft; 7. Hexafluoropropylene outlet; 8. Crude hexafluoropropylene inlet; 9. Pressure pump; 10. Support rod; 11. Rotating shaft bracket; 12. Rotating shaft snap-fit ​​hole. Detailed Implementation

[0020] The present invention will be further explained below with reference to the embodiments. The following embodiments are only used to illustrate the present invention, but are not intended to limit the scope of implementation of the present invention.

[0021] Example 1

[0022] like Figure 1 As shown, the device includes a cylindrical adsorption cabinet 1, which is open at one end and closed at the other. The open end is fitted with a detachable arc-shaped cover 2. The cover 2 has a hexafluoropropylene outlet 7 at its center, which connects to the adsorption cabinet 1. A pressure pump 9 is installed at the outlet. The adsorption cabinet 1 and the cover 2 are made of stainless steel or polytetrafluoroethylene. The adsorption cabinet 1 is equipped with a rotatable rotating roller 3 inside. The two ends of the rotating roller 3 are respectively provided with a first rotating shaft 6.1 and a second rotating shaft 6.2. The first rotating shaft 6.1 is engaged with the rotating shaft engagement hole 12 at the center of the rotating shaft bracket 11 provided inside the cover 2. The cover 2 is fixed by several support rods 10 around the engagement hole. The second rotating shaft 6.2 is connected to the closed end of the adsorption cabinet 1 and is driven to rotate by a motor. One end of the second rotating shaft 6.2 is detachably connected to the rotating drum 3 and the other end is fixed to the closed end of the adsorption cabinet 1, or one end is fixedly connected to the rotating drum 3 and the other end is detachably connected to the closed end of the adsorption cabinet 1. A crude hexafluoropropylene inlet 8 is provided at one end of the rotating drum 3 located at the closed end of the adsorption cabinet 1. The rotating drum 3 is made of polytetrafluoroethylene and has small holes 4 arranged around its body. The inside is filled with adsorbent.

[0023] like Figure 1 , Figure 2 and Figure 3 As shown, firstly, the rotating drum 3 containing the adsorbent 5 is inserted into the adsorption cabinet 1 with the first rotating shaft 6.1 facing outwards. The rotating drum 3 is connected to the second rotating shaft 6.2 fixed on the closed end of the adsorption cabinet 1 (or the second rotating shaft 6.2 is fixed to the closed end of the adsorption cabinet 1). The second rotating shaft 6.2 is also connected to the motor. Then, the first rotating shaft 6.1 is snapped into the rotating shaft snapping hole 12, and finally the cover 2 is tightened.

[0024] After the device is fixed, the motor is turned on, and the motor drives the second rotating shaft 6.2 to rotate the rotating drum 3. The crude hexafluoropropylene, which has been rapidly cooled, is introduced into the rotating drum 3 through the crude hexafluoropropylene inlet 8. Adsorption takes place under the conditions of pressure ≤ -0.1MPa, temperature 20~50℃, and rotation. After adsorption for a period of time, the adsorbed hexafluoropropylene is first discharged from the rotating drum 3 through the small hole 4 and accumulates at the center of the arc-shaped cover 2. Then, under the action of the pressure pump 9, it is sent to the distillation unit through the hexafluoropropylene outlet 7 for distillation and purification. When the adsorption capacity of the rotating drum 3 containing adsorbent 5 decreases, the motor is turned off first. After the rotating drum 3 stops rotating, the cover 2 is removed, and the first rotating shaft 6.1 automatically separates from the rotating shaft support 11. Then, the rotating drum 3 is pulled outward and separated from the second rotating shaft 6.2 (or the second rotating shaft 6.2 is separated from the closed end of the adsorption cabinet 1). The rotating drum 3 is taken out of the adsorption cabinet 1, and another rotating drum 3 filled with new adsorbent is installed into the adsorption cabinet 1 in the same manner. The replaced rotary drum 3 can be sent to a designated area to replace the adsorbent, and then put back into use.

[0025] Example 2

[0026] like Figure 4 As shown, the difference between this device and Embodiment 1 is that the rotating shaft support 11 has a panel structure, and the hexafluoropropylene outlet 7 is connected to the panel.

[0027] like Figure 2 , Figure 4 and Figure 5 As shown, the working principle of this embodiment is the same as that of embodiment 1.

[0028] Of course, there may be other embodiments of this utility model. Without departing from the spirit and essence of this utility model, those skilled in the art can make various corresponding changes and modifications based on this utility model, but these corresponding changes and modifications should all fall within the protection scope of the claims of this utility model.

Claims

1. An adsorption device for producing hexafluoropropylene, characterized in that, The device includes an adsorption cabinet (1), which is open at one end and closed at the other end, with a removable cover (2) at the open end; the adsorption cabinet (1) is equipped with a rotatable rotating drum (3), with a first rotating shaft (6.1) and a second rotating shaft (6.2) respectively at both ends of the rotating drum (3), the first rotating shaft (6.1) being connected to the cover (2), and the second rotating shaft (6.2) being connected to the closed end of the adsorption cabinet (1); a crude hexafluoropropylene inlet (8) is provided at one end of the rotating drum (3) located at the closed end of the adsorption cabinet (1), and a hexafluoropropylene outlet (7) communicating with the adsorption cabinet (1) is provided on the cover (2); small holes (4) are distributed around the rotating drum (3).

2. The adsorption apparatus for producing hexafluoropropylene according to claim 1, characterized in that, A pressure pump (9) is installed at the hexafluoropropylene outlet (7).

3. The adsorption apparatus for producing hexafluoropropylene according to claim 1, characterized in that, The adsorption cabinet (1) adopts a cylindrical structure.

4. The adsorption device for producing hexafluoropropylene according to claim 1, characterized in that, The rotating drum (3) is filled with an adsorbent.

5. The adsorption apparatus for producing hexafluoropropylene according to claim 1, characterized in that, The cover (2) is provided with a rotating shaft bracket (11) on the inner side, and a rotating shaft snap-fit ​​hole (12) is provided at the center of the rotating shaft bracket (11). The first rotating shaft (6.1) is snapped into the rotating shaft snap-fit ​​hole (12).

6. The adsorption apparatus for producing hexafluoropropylene according to claim 5, characterized in that, The pivot bracket (11) has a panel structure, the periphery of which is fixed to the cover (2), and the hexafluoropropylene outlet (7) is connected to the panel.

7. The adsorption apparatus for producing hexafluoropropylene according to claim 5, characterized in that, The rotating shaft bracket (11) is fixed to the cover (2) by several support rods (10) around the rotating shaft snap hole (12). The outer side of the cover (2) is an arc surface, and the hexafluoropropylene outlet (7) is connected to the center of the cover (2).

8. The adsorption apparatus for producing hexafluoropropylene according to claim 1, characterized in that, The second rotating shaft (6.2) is driven to rotate by a motor. One end is detachably connected to the rotating drum (3), and the other end is fixed to the closed end of the adsorption cabinet (1); or one end is fixedly connected to the rotating drum (3), and the other end is detachably connected to the closed end of the adsorption cabinet (1).

9. The adsorption apparatus for producing hexafluoropropylene according to claim 1, characterized in that, The adsorption cabinet (1) and the cover (2) are made of stainless steel or polytetrafluoroethylene, and the rotating drum (3) is made of polytetrafluoroethylene.

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