Extractive rectification device for purifying pentafluoroethane

Abstract

The invention belongs to the field of pentafluoroethane purification, particularly relates to an extractive distillation device for pentafluoroethane purification, and aims to solve the problem that the extractive distillation effect is poor due to the fact that an existing pentafluoroethane crude product is inconvenient to fully and uniformly contact with an extracting agent. The mounting seat is fixedly mounted in the rectifying tower; the hollow column is fixedly mounted on one side of the mounting seat; the feeding pipe is mounted on the rectifying tower, and one end of the feeding pipe extends into the hollow column; the rotating pipe is rotationally mounted at the top of the hollow column, the bottom end of the rotating pipe extends into the hollow column and is fixedly provided with a hollow rod, a plurality of liquid spraying holes are formed in the hollow rod, and a plurality of turbulent flow blocks are fixedly mounted on the outer side of the hollow rod; according to the device, a gas-phase pentafluoroethane crude product is stirred, meanwhile, the rotating pipe rotates, so that the spraying range of extract liquor is larger, the gas-phase pentafluoroethane crude product is in uniform and sufficient contact with an extraction agent, and the extraction effect is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of purification of pentafluoroethane, and particularly relates to an extractive distillation device for purifying pentafluoroethane. Background Art

[0002] Pentafluoroethane is a colorless non-flammable gas with the chemical formula C2HF5 and a molecular weight of 120.02. Its structural formula is CF3CHF2, with a melting point of -102.95 °C and a boiling point of -48.45 °C. Pentafluoroethane is slightly soluble in water and has an aromatic smell; when producing pentafluoroethane, extractive distillation is required for the crude pentafluoroethane product. The common method is to introduce the crude pentafluoroethane product into a distillation column to contact with an extractant to achieve extractive distillation.

[0003] In the prior art, the crude pentafluoroethane product is not easily and evenly contacted with the extractant, resulting in poor extractive distillation effect. Therefore, we propose an extractive distillation device for purifying pentafluoroethane to solve the above problems. Summary of the Invention

[0004] The purpose of the present invention is to solve the drawback in the prior art that the crude pentafluoroethane product is not easily and evenly contacted with the extractant, resulting in poor extractive distillation effect, and to propose an extractive distillation device for purifying pentafluoroethane.

[0005] To achieve the above purpose, the present invention adopts the following technical solutions:

[0006] An extractive distillation device for purifying pentafluoroethane, comprising:

[0007] A distillation column;

[0008] A mounting seat, fixedly installed inside the distillation column;

[0009] A hollow column, fixedly installed on one side of the mounting seat;

[0010] A feed pipe, installed on the distillation column, with one end extending into the hollow column;

[0011] A rotating pipe, rotatably installed on the top of the hollow column, with the bottom end extending into the hollow column and fixedly installed with a hollow rod. The hollow rod is provided with a plurality of liquid spraying holes, and a plurality of flow disturbing blocks are fixedly installed on the outer side of the hollow rod;

[0012] A fixed pipe, fixedly installed on the top of the distillation column, with the outer side of the fixed pipe in contact with the inner wall of the rotating pipe;

[0013] An extraction tank, fixedly installed outside the distillation column;

[0014] A delivery pump, fixedly installed on the top of the extraction tank;

[0015] A connecting pipe, one end of which is fixedly communicated with a fixed pipe, and the other end of which is fixedly connected to the liquid outlet of a delivery pump;

[0016] An installation box, fixedly installed on the inner wall of the top of the extraction box, and the liquid inlet of the delivery pump is fixedly communicated with the installation box;

[0017] A liquid extraction pipe, fixedly communicated with the bottom of the installation box, and used for extracting the extractant;

[0018] A stirring mechanism, arranged at the bottom of the installation box, and used for stirring the extractant;

[0019] A rotating mechanism, arranged inside the installation box, and used for driving the rotating pipe to rotate.

[0020] Preferably, the stirring mechanism includes an annular groove arranged at the bottom of the installation box, an annular plate is rotatably installed in the annular groove, and a circular plate is fixedly installed at the bottom of the annular plate.

[0021] Preferably, a round hole is formed in the circular plate, the outer side of the liquid extraction pipe is in contact with the inner wall of the round hole, and two vertical rods are fixedly installed at the bottom of the circular plate, and a plurality of stirring blocks are fixedly installed on the outer sides of the two vertical rods.

[0022] Preferably, a fixing plate is fixedly installed on one side of the installation box, a vertical hole is formed in the fixing plate, a transmission rod is rotatably installed in the vertical hole, a gear is fixedly installed at the bottom end of the transmission rod, and an annular gear is engaged with the gear, and the annular gear is fixedly sleeved on the outer side of the circular plate.

[0023] Preferably, the rotating mechanism includes a cross bar, a rotating hole is formed in one side of the installation box, the cross bar is rotatably installed in the rotating hole, a plurality of blades located inside the installation box are fixedly installed on the outer side of the cross bar, one end of the cross bar extends into the rectifying tower and a first bevel gear is fixedly installed, a second bevel gear is engaged with the first bevel gear, the second bevel gear is fixedly sleeved on the outer side of the rotating pipe, and a connecting hole is formed in the top of the hollow column, and the rotating pipe is rotatably installed in the connecting hole.

[0024] Preferably, a third bevel gear is fixedly sleeved on the outer side of the cross bar, a fourth bevel gear is engaged with the third bevel gear, and the fourth bevel gear is fixedly installed at the top end of the transmission rod.

[0025] Preferably, a fixing hole is formed in the outer side of the rectifying tower, and the outer side of the feed pipe is fixedly connected to the inner wall of the fixing hole.

[0026] Preferably, one end of a discharge pipe is fixedly communicated with the outer side of the hollow column, and the other end of the discharge pipe extends to the outer side of the rectifying tower.

[0027] Preferably, a drain pipe is fixedly communicated with the bottom of the rectifying tower, and a valve is arranged on the drain pipe.

[0028] Preferably, an extraction agent addition port is provided on one side of the extraction tank, and an outflow hole is provided at the bottom of the hollow column.

[0029] In the present invention, the beneficial effects of the extractive distillation device for purifying pentafluoroethane are as follows:

[0030] The crude gas-phase pentafluoroethane product enters the hollow column through the feed pipe. The transfer pump is started, and the extraction agent is extracted through the liquid extraction pipe. The extraction agent passes through the installation box, connecting pipe, fixed pipe, rotating pipe and finally enters the hollow rod, and then sprays out from a plurality of liquid spraying holes to contact the crude gas-phase pentafluoroethane product entering the hollow column, and extractive distillation is carried out on the crude gas-phase pentafluoroethane product.

[0031] The rotating pipe drives the hollow rod to rotate, and the hollow rod drives the turbulence block to rotate to stir the crude gas-phase pentafluoroethane product. At the same time, the rotation of the rotating pipe makes the spraying range of the extraction liquid larger, so that the crude gas-phase pentafluoroethane product is in uniform and sufficient contact with the extraction agent, improving the extraction effect; the cross bar will drive the third bevel gear to rotate at the same time, the third bevel gear drives the fourth bevel gear to rotate, the fourth bevel gear drives the transmission rod to rotate, the transmission rod drives the gear to rotate, the gear drives the annular gear disk to rotate, the annular gear disk drives the circular plate to rotate, and further drives a plurality of stirring blocks to stir the extraction agent, so that the extraction agent maintains uniformity.

[0032] The present invention stirs the crude gas-phase pentafluoroethane product. At the same time, the rotation of the rotating pipe makes the spraying range of the extraction liquid larger, so that the crude gas-phase pentafluoroethane product is in uniform and sufficient contact with the extraction agent, improving the extraction effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 is a schematic structural diagram of an extractive distillation device for purifying pentafluoroethane proposed by the present invention;

[0034] Figure 2 is an extractive distillation device for purifying pentafluoroethane proposed by the present invention Figure 1 The enlarged structural diagram of part A;

[0035] Figure 3 is an extractive distillation device for purifying pentafluoroethane proposed by the present invention Figure 1 The enlarged structural diagram of part B;

[0036] Figure 4 is an extractive distillation device for purifying pentafluoroethane proposed by the present invention Figure 1 The enlarged structural diagram of part C;

[0037] Figure 5 is a schematic side view structural diagram of the cross bar and blades of an extractive distillation device for purifying pentafluoroethane proposed by the present invention.

[0038] In the figure: 1, rectifying column; 2, mounting seat; 3, hollow column; 4, feed pipe; 5, discharge pipe; 6, outflow hole; 7, hollow rod; 8, liquid spraying hole; 9, flow disturbing block; 10, protective cover; 11, rotating pipe; 12, second bevel gear; 13, fixed pipe; 14, extraction tank; 15, delivery pump; 16, connecting pipe; 17, extractant adding port; 18, mounting box; 19, liquid pumping pipe; 20, cross bar; 21, first bevel gear; 22, blade; 23, annular groove; 24, annular plate; 25, circular plate; 26, vertical rod; 27, stirring block; 28, annular toothed disc; 29, fixing plate; 30, transmission rod; 31, gear; 32, fourth bevel gear; 33, third bevel gear; 34, drain pipe; 35, valve; 36, connecting hole; 37, vertical hole; 38, rotating hole; 39, round hole; 40, fixing hole. Specific implementation mode

[0039] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0040] Embodiment 1

[0041] Refer to Figures 1-5 , an extractive distillation device for purifying pentafluoroethane, comprising:

[0042] Rectifying column 1;

[0043] Mounting seat 2, fixedly installed inside rectifying column 1;

[0044] Hollow column 3, fixedly installed on one side of mounting seat 2;

[0045] Feed pipe 4, installed on rectifying column 1, with one end extending into hollow column 3;

[0046] Rotating pipe 11, rotatably installed on the top of hollow column 3, with the bottom end extending into hollow column 3 and fixedly installed with a hollow rod 7. A plurality of liquid spraying holes 8 are provided on hollow rod 7, and a plurality of flow disturbing blocks 9 are fixedly installed on the outer side of hollow rod 7;

[0047] Fixed pipe 13, fixedly installed on the top of rectifying column 1, with the outer side of fixed pipe 13 in contact with the inner wall of rotating pipe 11;

[0048] Extraction tank 14, fixedly installed outside rectifying column 1;

[0049] Delivery pump 15, fixedly installed on the top of extraction tank 14;

[0050] Connecting pipe 16, with one end fixedly communicated with fixed pipe 13 and the other end fixedly connected to the liquid outlet of delivery pump 15;

[0051] The installation box 18 is fixedly installed on the inner wall of the top of the extraction box 14, and the liquid inlet of the transfer pump 15 is fixedly communicated with the installation box 18;

[0052] The liquid extraction pipe 19 is fixedly communicated with the bottom of the installation box 18 and is used for extracting the extractant;

[0053] The stirring mechanism is arranged at the bottom of the installation box 18 and is used for stirring the extractant;

[0054] The rotating mechanism is arranged in the installation box 18 and is used for driving the rotating pipe 11 to rotate.

[0055] In this embodiment, the stirring mechanism includes an annular groove 23 arranged at the bottom of the installation box 18. An annular plate 24 is rotatably installed in the annular groove 23, and a circular plate 25 is fixedly installed at the bottom of the annular plate 24.

[0056] In this embodiment, a circular hole 39 is formed in the circular plate 25. The outer side of the liquid extraction pipe 19 is in contact with the inner wall of the circular hole 39. Two vertical rods 26 are fixedly installed at the bottom of the circular plate 25, and a plurality of stirring blocks 27 are fixedly installed on the outer sides of the two vertical rods 26.

[0057] In this embodiment, a fixing plate 29 is fixedly installed on one side of the installation box 18. A vertical hole 37 is formed in the fixing plate 29. A transmission rod 30 is rotatably installed in the vertical hole 37. A gear 31 is fixedly installed at the bottom end of the transmission rod 30. An annular gear disk 28 is engaged with the gear 31, and the annular gear disk 28 is fixedly sleeved on the outer side of the circular plate 25.

[0058] In this embodiment, the rotating mechanism includes a cross bar 20. A rotating hole 38 is formed in one side of the installation box 18. The cross bar 20 is rotatably installed in the rotating hole 38. A plurality of blades 22 located inside the installation box 18 are fixedly installed on the outer side of the cross bar 20. One end of the cross bar 20 extends into the rectification tower 1 and a first bevel gear 21 is fixedly installed. A second bevel gear 12 is engaged with the first bevel gear 21, and the second bevel gear 12 is fixedly sleeved on the outer side of the rotating pipe 11. A connection hole 36 is formed at the top of the hollow column 3, and the rotating pipe 11 is rotatably installed in the connection hole 36.

[0059] In this embodiment, a third bevel gear 33 is fixedly sleeved on the outer side of the cross bar 20. A fourth bevel gear 32 is engaged with the third bevel gear 33, and the fourth bevel gear 32 is fixedly installed at the top end of the transmission rod 30.

[0060] In this embodiment, a fixing hole 40 is formed on the outer side of the rectification tower 1, and the outer side of the feed pipe 4 is fixedly connected to the inner wall of the fixing hole 40.

[0061] In this embodiment, one end of a discharge pipe 5 is fixedly communicated with the outer side of the hollow column 3, and the other end of the discharge pipe 5 extends to the outside of the rectification tower 1.

[0062] In this embodiment, a drain pipe 34 is fixedly connected to the bottom of the rectifying column 1, and a valve 35 is provided on the drain pipe 34.

[0063] In this embodiment, an extraction agent addition port 17 is provided on one side of the extraction tank 14, and an outflow hole 6 is provided at the bottom of the hollow column 3.

[0064] In this embodiment, during use, the crude product of gaseous pentafluoroethane enters the hollow column 3 through the feed pipe 4. The transfer pump 15 is started, and the extraction agent is extracted through the liquid extraction pipe 19. The extraction agent passes through the installation box 18, the connecting pipe 16, the fixed pipe 13, the rotating pipe 11, and finally enters the hollow rod 7, and then sprays out from a plurality of liquid spraying holes 8 to contact the crude product of gaseous pentafluoroethane entering the hollow column 3, and extractive distillation is performed on the crude product of gaseous pentafluoroethane. The liquid flows out from the outflow hole 6, and the gaseous pentafluoroethane is discharged from the discharge pipe 5 and enters the next process. At the same time, when the extraction agent passes through the installation box 18, it will impact the blade 22 to rotate. The blade 22 drives the cross bar 20 to rotate, the cross bar 20 drives the first bevel gear 21 to rotate, the first bevel gear 21 drives the second bevel gear 12 to rotate, the second bevel gear 12 drives the rotating pipe 11 to rotate, the rotating pipe 11 drives the hollow rod 7 to rotate, and the hollow rod 7 drives the turbulence block 9 to rotate to stir the crude product of gaseous pentafluoroethane. At the same time, the rotation of the rotating pipe 11 makes the spraying range of the extraction liquid larger, so that the crude product of gaseous pentafluoroethane and the extraction agent are evenly and fully contacted, improving the extraction effect; the cross bar 20 will also drive the third bevel gear 33 to rotate at the same time, the third bevel gear 33 drives the fourth bevel gear 32 to rotate, the fourth bevel gear 32 drives the transmission rod 30 to rotate, the transmission rod 30 drives the gear 31 to rotate, the gear 31 drives the annular gear disk 28 to rotate, and the annular gear disk 28 drives the circular plate 25 to rotate, thereby driving a plurality of stirring blocks 27 to stir the extraction agent to keep the extraction agent uniform.

[0065] Embodiment 2

[0066] The difference between this embodiment and Embodiment 1 is that a protective cover 10 is fixedly installed at the bottom of the hollow rod 7. The setting of the protective cover 10 prevents the extraction agent from entering the feed pipe 4.

[0067] The rest is the same as that in Embodiment 1.

[0068] The above is only the preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. An extractive distillation device for purifying pentafluoroethane, characterized in that: include: Distillation tower (1); A mounting base (2) fixedly mounted in the distillation tower (1); A hollow column (3) fixedly mounted on one side of the mounting seat (2); A feed pipe (4) is installed on the distillation tower (1), with one end extending into the hollow column (3); A rotating tube (11) is rotatably mounted on the top of the hollow column (3), the bottom end of which extends into the hollow column (3) and is fixedly mounted with a hollow rod (7), the hollow rod (7) being provided with a plurality of liquid spray holes (8), and a plurality of spoiler blocks (9) being fixedly mounted on the outer side of the hollow rod (7); A fixed tube (13) is fixedly mounted on the top of the distillation tower (1), and the outer side of the fixed tube (13) is in contact with the inner wall of the rotating tube (11); An extraction box (14) is fixedly mounted on the outside of the distillation tower (1); A delivery pump (15) is fixedly mounted on the top of the extraction box (14); A connecting pipe (16), one end of which is fixedly connected to the fixed pipe (13), and the other end of which is fixedly connected to the liquid outlet of the delivery pump (15); An installation box (18) is fixedly installed on the top inner wall of the extraction box (14), and a liquid inlet of the delivery pump (15) is fixedly connected to the installation box (18); A liquid extraction pipe (19), fixedly connected to the bottom of the installation box (18), for extracting the extractant; A stirring mechanism, arranged at the bottom of the installation box (18), for stirring the extractant; The rotating mechanism is arranged in the installation box (18) and is used to drive the rotating tube (11) to rotate.

2. The extractive distillation device for purifying pentafluoroethane according to claim 1, characterized in that: The stirring mechanism comprises an annular groove (23) arranged at the bottom of the installation box (18), an annular plate (24) is rotatably mounted in the annular groove (23), and a circular plate (25) is fixedly mounted at the bottom of the annular plate (24).

3. The extractive distillation device for purifying pentafluoroethane according to claim 2, characterized in that: The circular plate (25) is provided with a circular hole (39), the outer side of the liquid extraction tube (19) contacts the inner wall of the circular hole (39), two vertical rods (26) are fixedly mounted on the bottom of the circular plate (25), and a plurality of stirring blocks (27) are fixedly mounted on the outer sides of the two vertical rods (26).

4. The extractive distillation device for purifying pentafluoroethane according to claim 3, characterized in that: A fixing plate (29) is fixedly mounted on one side of the mounting box (18), a vertical hole (37) is formed on the fixing plate (29), a transmission rod (30) is rotatably mounted in the vertical hole (37), a gear (31) is fixedly mounted on the bottom end of the transmission rod (30), an annular gear disc (28) is meshed on the gear (31), and the annular gear disc (28) is fixedly sleeved on the outer side of the circular plate (25).

5. The extractive distillation device for purifying pentafluoroethane according to claim 4, characterized in that: The rotating mechanism comprises a cross bar (20), a rotating hole (38) is formed on one side of the mounting box (18), the cross bar (20) is rotatably mounted in the rotating hole (38), a plurality of blades (22) located in the mounting box (18) are fixedly mounted on the outer side of the cross bar (20), one end of the cross bar (20) extends into the distillation tower (1) and is fixedly mounted with a first bevel gear (21), a second bevel gear (12) is meshed on the first bevel gear (21), the second bevel gear (12) is fixedly sleeved on the outer side of the rotating tube (11), a connecting hole (36) is formed on the top of the hollow column (3), and the rotating tube (11) is rotatably mounted in the connecting hole (36).

6. The extractive distillation device for purifying pentafluoroethane according to claim 5, characterized in that: A third bevel gear (33) is provided on the outer fixed sleeve of the crossbar (20), a fourth bevel gear (32) is meshed on the third bevel gear (33), and the fourth bevel gear (32) is fixedly mounted on the top end of the transmission rod (30).

7. The extractive distillation device for purifying pentafluoroethane according to claim 6, characterized in that: The outside of the distillation tower (1) is provided with a fixing hole (40), and the outside of the feed pipe (4) is fixedly connected to the inner wall of the fixing hole (40).

8. The extractive distillation device for purifying pentafluoroethane according to claim 7, characterized in that: The outer side of the hollow column (3) is fixedly connected to one end of a discharge pipe (5), and the other end of the discharge pipe (5) extends to the outside of the distillation tower (1).

9. An extractive distillation device for purifying pentafluoroethane according to claim 8, characterized in that: The bottom of the distillation tower (1) is fixedly connected to a liquid discharge pipe (34), and a valve (35) is provided on the liquid discharge pipe (34).

10. An extractive distillation device for purifying pentafluoroethane according to claim 9, characterized in that: An extractant addition port (17) is provided on one side of the extraction box (14), and an outflow hole (6) is provided at the bottom of the hollow column (3).

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