Purification device and process for high-purity isopropanol

Abstract

The application relates to the technical field of isopropanol purification, in particular to a high-purity isopropanol purification device and process; the device comprises a hydrogenation reactor, a gas-liquid separator, a preheater, a plate-type rectifying tower, a reboiler, a condenser and a dehydration tower; the plate-type rectifying tower comprises a tower body; the tower body is sequentially provided with a gas outlet, a liquid inlet, a feed inlet and a discharge outlet from top to bottom; a tower tray is arranged in the tower body; a downcomer is arranged on one side of the tower tray; the cleaning rod is arranged to drive the filter cloth to move towards the downcomer, so that the filter cloth pushes the foam on the liquid surface to move towards the downcomer, until the filter cloth contacts the downcomer, the filter cloth extrudes and breaks the foam blocked on the surface, thereby reducing the foam dispersion system, not only making the gas-liquid contact more uniform, reducing the mass transfer resistance, improving the separation efficiency of isopropanol-ketone, but also stabilizing the gas-liquid flow, avoiding the problems of liquid flooding or tower flooding, and prolonging the continuous operation time.

Description

Technical Field

[0001] This invention relates to the field of isopropanol purification technology, specifically to a purification apparatus and process for high-purity isopropanol. Background Technology

[0002] Isopropanol, with the molecular formula (CH3)2CHOH, is a colorless, transparent, volatile liquid miscible with ethanol, ether, chloroform, and water. It is an excellent organic solvent, used not only as a solvent for shellac, nitrocellulose, alkaloids, rubber, and oils, but also as a raw material for the synthesis of glycerol, isopropyl acetate, and acetone. It has wide applications in pesticides, electronics, pharmaceuticals, coatings, daily chemicals, and organic synthesis.

[0003] The synthesis of isopropanol includes the acetone hydrogenation method, in which acetone is hydrogenated to produce isopropanol in the presence of a copper or nickel-based catalyst. However, the resulting isopropanol contains unreacted acetone, so the isopropanol-acetone mixture needs to be separated and purified. Since acetone has a boiling point of about 56.5℃ and isopropanol has a boiling point of 82.5℃, the boiling point difference between acetone and isopropanol is 26℃, and there is no azeotropic phenomenon. Therefore, a plate distillation column can be used to separate them. A plate distillation column is a type of staged contact mass transfer device used in gas-liquid or liquid-liquid systems. It consists of a cylindrical column body and several trays horizontally arranged at certain intervals inside the column, and is widely used in distillation and absorption.

[0004] However, in the use of existing plate distillation columns, an azeotropic agent (such as n-hexane) is added to the top of the column to form an acetone-azeotropic agent azeotrope (azeotropic temperature 49-50℃). After condensation and separation, acetone is separated, and unreacted acetone and light components are collected from the top of the column. The azeotropic agent is recycled. When the azeotropic agent (such as n-hexane) flows from top to bottom and comes into countercurrent contact with the rising gas phase (vaporized isopropanol-acetone mixture), the violent relative motion forms an unstable foam dispersion system with gas as the dispersed phase and liquid as the continuous phase through fluid shear and interface disturbance. This foam dispersion system increases the gas-liquid contact area but also hinders the mass transfer rate and reduces the separation efficiency of isopropanol-acetone.

[0005] In view of this, in order to overcome the above-mentioned technical problems, the present invention proposes a purification device and process for high-purity isopropanol, which solves the above-mentioned technical problems. Summary of the Invention

[0006] To overcome the shortcomings of existing technologies, this invention proposes a purification device and process for high-purity isopropanol. This invention incorporates a cleaning rod that moves the filter cloth towards the downcomer, causing the filter cloth to push the foam on the liquid surface towards the downcomer until the filter cloth contacts the downcomer. This allows the filter cloth to crush the foam blocking the surface, reducing the foam dispersion system. This not only makes the gas-liquid contact more uniform, reduces mass transfer resistance, and improves the separation efficiency of isopropanol-acetone, but also stabilizes the gas-liquid flow, avoids flooding or tower submersion problems, and extends continuous operation time.

[0007] The technical solution adopted by this invention to solve its technical problem is as follows: A high-purity isopropanol purification device according to this invention includes a hydrogenation reactor, a gas-liquid separator, a preheater, a plate distillation column, a reboiler, a condenser, and a dehydration column. The plate distillation column includes a column body; the column body has a gas outlet, a liquid inlet, a feed inlet, and a discharge outlet sequentially opened from top to bottom; a tray is installed inside the column body; a downcomer is installed on one side of the tray; sieve holes are opened on the surface of the tray; a float valve is slidably installed in the sieve holes.

[0008] The lower end of the tray has two opposing arc-shaped grooves; a slider is slidably connected within the arc-shaped grooves; a cleaning rod is installed at the lower end of the slider, and a strip-shaped groove is formed on the surface of the cleaning rod; a cavity communicating with the strip-shaped groove is formed inside the cleaning rod; a rotating rod is rotatably connected within the cavity; the lower end of the rotating rod is connected to the cleaning rod via a coil spring; a filter cloth is placed between two adjacent cleaning rods; both ends of the filter cloth are connected to the rotating rods inside the two cleaning rods respectively; a traction module is installed within the arc-shaped grooves; the traction module is used to pull the slider to slide within the arc-shaped grooves.

[0009] Preferably, the traction module includes a metal rope; a cavity is formed inside the tray; a winding rod is rotatably connected inside the cavity; one end of the metal rope is connected to the winding rod, and the other end is connected to the slider; a bevel gear ring is fixedly connected to the surface of the winding rod; a bevel gear shaft meshing with the bevel gear ring is provided on one side; the bevel gear shaft is rotatably connected to the tower body; a drive motor is installed on one side of the tower body; the drive motor is used to drive the bevel gear shaft to rotate; a reset unit is installed inside the cavity; the reset unit is used to pull the slider in the arc-shaped groove to reset.

[0010] Preferably, the reset unit includes a round rod; the round rod is rotatably connected in the cavity; a rectangular groove is formed at one end of the round rod near the winding rod; a rectangular rod is slidably connected in the rectangular groove; a slot is formed at one end of the winding rod near the round rod; a hydraulic pump is installed on one side of the machine body; the hydraulic pump is connected to the rectangular groove through a connecting pipe; a steel wire rope is fixedly connected to the end of the slider away from the metal rope; the end of the steel wire rope away from the slider is fixedly connected to the round rod.

[0011] Preferably, the reset unit further includes a take-up drum; the take-up drum is rotatably connected to the surface of the take-up rod; the inner wall of the take-up drum is provided with a toothed groove; the surface of the take-up rod is provided with a groove corresponding to the toothed groove; a locking block is slidably connected in the groove; a push plate is slidably and sealingly connected in the slot; the push plate is connected to the bottom of the slot by a support spring; the slot and the groove are connected by an air passage; and the end of the metal rope away from the slider is connected to the take-up drum.

[0012] Preferably, a fixing rod is provided between the cleaning rod and the slider; the fixing rod is fixedly connected to the slider; a fixing groove is provided at the upper end of the cleaning rod; the fixing rod is slidably connected in the fixing groove; and the fixing rod and the bottom of the fixing groove are connected by a fixing spring.

[0013] Preferably, the side of the liquid-reducing plate near the cleaning rod has an installation groove; an airbag is fixedly connected in the installation groove.

[0014] Preferably, the side wall of the arc-shaped groove is provided with an air storage groove that communicates with the installation groove; a sealing plate is slidably and sealingly connected inside the air storage groove; the sealing plate is connected to the bottom of the air storage groove by a sealing spring.

[0015] Preferably, a magnet is embedded in the bottom of the mounting groove; a metal ball is attracted to one side of the magnet; and the metal ball is fixed to the inner wall of the airbag by an elastic rope.

[0016] A purification process for high-purity isopropanol, applicable to the aforementioned high-purity isopropanol purification apparatus, comprises the following steps:

[0017] S1: The mixture containing isopropanol produced by the hydrogenation reaction of acetone is sent to the gas-liquid separator to separate the liquid product containing isopropanol and acetone. The liquid product is heated to 60-90°C by the preheater. At the same time, an azeotropic agent at 60°C is sent into the tower until the azeotropic agent is evenly discharged from the outlet at the bottom of the tower. The preheater is controlled to send the heated liquid product into the tower through the feed inlet.

[0018] S2: After the liquid product heated by the preheater is delivered into the tower, the drive motor is controlled to drive the winding rod to rotate in the forward direction. This causes the winding rod to pull the slider through the metal rope and move the cleaning rod towards the downcomer plate. This causes the cleaning rod to push the foam on the azeotropic liquid surface to the downcomer plate through the filter cloth. The foam is then crushed by the air bladder on one side of the filter cloth and the downcomer plate.

[0019] S3: After the foam is completely broken, control the hydraulic pump to deliver hydraulic oil into the rectangular groove at one end of the round rod, so that the round rod is connected to the winding rod through the rectangular rod in the rectangular groove. Control the drive motor to drive the winding rod to rotate in the opposite direction, so that the winding rod drives the wire rope through the round rod to pull the slider to reset, so that the slider drives the cleaning rod to reset.

[0020] S4: As the liquid product heated by the preheater is transported into the tower body, the gaseous product discharged from the tower outlet is transported to the condenser for condensation treatment, while the liquid product at the bottom of the tower body is transported to the reboiler for heating at a temperature of 70-75℃. The heated vaporized azeotropic agent is transported to the condenser for condensation, and then transported back into the tower body for recycling. The mixture of isopropanol and water obtained by separation is dehydrated through a dehydration tower to finally obtain the required high-purity isopropanol.

[0021] The beneficial effects of this invention are as follows:

[0022] 1. This invention, by setting a cleaning rod, moves the filter cloth towards the downcomer, causing the filter cloth to push the foam on the liquid surface towards the downcomer until the filter cloth contacts the downcomer. This causes the filter cloth to crush the foam blocking the surface, thereby reducing the foam dispersion system. This not only makes the gas-liquid contact more uniform, reduces mass transfer resistance, and improves the separation efficiency of isopropanol-acetone, but also stabilizes the gas-liquid flow, avoids flooding or tower flooding problems, and extends the continuous operation time.

[0023] 2. This invention features a rotating rod within a cavity connected to a cleaning rod via a coil spring. As the distance between the cleaning rods increases, the rotating rod pulls the coil spring to contract, releasing the filter cloth on the rotating rod's surface. This increases the length of the filter cloth between the two cleaning rods, ensuring effective foam blocking. When the two cleaning rods approach each other, the contracted coil spring is released, and the rotating rod rotates under the restoring force of the coil spring. This causes the excess length of filter cloth between the two cleaning rods to wrap around the rotating rod's surface, maintaining constant tension and thus improving the filter cloth's foam blocking and filtering effect. Attached Figure Description

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0025] Figure 1 This is a perspective view of the plate distillation column used in this invention;

[0026] Figure 2 This is a partial cross-sectional view of the plate distillation column used in this invention;

[0027] Figure 3 yes Figure 2 Enlarged view of point A in the middle;

[0028] Figure 4 This is a partial cross-sectional view of the tray used in this invention;

[0029] Figure 5 yes Figure 4 Enlarged view of point B in the middle;

[0030] Figure 6 yes Figure 4 Enlarged view of point C in the middle;

[0031] Figure 7 This is a schematic diagram of the transmission of the slider used in this invention;

[0032] Figure 8 This is a process flow diagram of the present invention;

[0033] In the diagram: 1. Tower body; 11. Gas outlet; 12. Liquid inlet; 13. Feed inlet; 14. Discharge outlet; 15. Tray; 151. Downcomer; 152. Sieve; 153. Float valve; 16. Drive motor; 17. Hydraulic pump; 171. Connecting pipe; 18. Mounting slot; 181. Magnet; 182. Metal ball; 183. Elastic rope; 19. Airbag; 2. Arc-shaped groove; 21. Slider; 22. Cleaning rod; 221. Strip groove; 222. Cavity; 223. Rotating rod; 224. Coil spring; 22 5. Filter cloth; 23. Metal rope; 24. Fixing rod; 25. Fixing groove; 26. Fixing spring; 27. Gas storage tank; 271. Sealing plate; 272. Sealing spring; 3. Cavity; 31. Winding rod; 311. Bevel gear ring; 312. Slot; 313. Groove; 314. Locking block; 315. Push plate; 316. Support spring; 317. Air passage; 32. Bevel gear shaft; 33. Round rod; 331. Rectangular groove; 332. Rectangular rod; 333. Steel wire rope; 34. Winding drum; 35. Toothed groove. Detailed Implementation

[0034] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0035] like Figures 1 to 8 As shown, the purification apparatus for high-purity isopropanol according to the present invention includes a hydrogenation reactor, a gas-liquid separator, a preheater, a plate distillation column, a reboiler, a condenser, and a dehydration column. The plate distillation column includes a column body 1. The column body 1 has a gas outlet 11, a liquid inlet 12, a feed inlet 13, and a discharge outlet 14 sequentially opened from top to bottom. A tray 15 is installed inside the column body 1. A downcomer 151 is installed on one side of the tray 15. A sieve hole 152 is opened on the surface of the tray 15. A float valve 153 is slidably installed in the sieve hole 152.

[0036] The lower end of the tray 15 has two opposing arc-shaped grooves 2; a slider 21 is slidably connected within the arc-shaped grooves 2; a cleaning rod 22 is installed at the lower end of the slider 21, and a strip groove 221 is formed on the surface of the cleaning rod 22; a cavity 222 communicating with the strip groove 221 is formed inside the cleaning rod 22; a rotating rod 223 is rotatably connected within the cavity 222; the lower end of the rotating rod 223 is connected to the cleaning rod 22 via a coil spring 224; a filter cloth 225 is provided between two adjacent cleaning rods 22; both ends of the filter cloth 225 are respectively connected to the rotating rod 223 within the two cleaning rods 22; a traction module is installed within the arc-shaped grooves 2; the traction module is used to pull the slider 21 to slide within the arc-shaped grooves 2.

[0037] In one embodiment of the present invention, the traction module includes a metal rope 23; a cavity 3 is provided inside the tray; a winding rod 31 is rotatably connected inside the cavity 3; one end of the metal rope 23 is connected to the winding rod 31, and the other end is connected to the slider 21; a bevel gear ring 311 is fixedly connected to the surface of the winding rod 31; a bevel gear shaft 32 meshing with the bevel gear ring 311 is provided on one side; the bevel gear shaft 32 is rotatably connected to the tower body 1; a drive motor 16 is installed on one side of the tower body 1; the drive motor 16 is used to drive the bevel gear shaft 32 to rotate; a reset unit is installed inside the cavity 3; the reset unit is used to pull the slider 21 in the arc groove 2 to reset.

[0038] In one embodiment of the present invention, the reset unit includes a round rod 33; the round rod 33 is rotatably connected in the cavity 3; a rectangular groove 331 is provided at one end of the round rod 33 near the winding rod 31; a rectangular rod 332 is slidably connected in the rectangular groove 331; a slot 312 is provided at one end of the winding rod 31 near the round rod 33; a hydraulic pump 17 is installed on one side of the machine body; the hydraulic pump 17 is connected to the rectangular groove 331 through a connecting pipe 171; a steel wire rope 333 is fixedly connected to one end of the slider 21 away from the metal rope 23; and the end of the steel wire rope 333 away from the slider 21 is fixedly connected to the round rod 33.

[0039] In one embodiment of the present invention, the reset unit further includes a take-up drum 34; the take-up drum 34 is rotatably connected to the surface of the take-up rod 31; the inner wall of the take-up drum 34 is provided with a toothed groove 35; the surface of the take-up rod 31 is provided with a groove 313 opposite to the toothed groove 35; a locking block 314 is slidably connected in the groove 313; a push plate 315 is slidably and sealingly connected in the slot 312; the push plate 315 is connected to the bottom of the slot 312 by a support spring 316; the slot 312 and the groove 313 are connected by an air passage 317; the end of the metal rope 23 away from the slider 21 is connected to the take-up drum 34.

[0040] In one embodiment of the present invention, a fixing rod 24 is provided between the cleaning rod 22 and the slider 21; the fixing rod 24 is fixedly connected to the slider 21; a fixing groove 25 is provided at the upper end of the cleaning rod 22; the fixing rod 24 is slidably connected in the fixing groove 25; the fixing rod 24 and the bottom of the fixing groove 25 are connected by a fixing spring 26.

[0041] During operation, existing plate distillation columns form an acetone-acetoluene azeotrope (azeotropic temperature 49-50℃) by adding an azeotropic agent (such as n-hexane) to the top of the column. After condensation and separation, acetone is separated, and unreacted acetone and light components are collected from the top of the column. The azeotropic agent is recycled. When the azeotropic agent (such as n-hexane) flows from top to bottom and comes into countercurrent contact with the rising gas phase (vaporized isopropanol-acetone mixture), the intense relative motion, through fluid shear and interface disturbance, forms an unstable foam dispersion system with gas as the dispersed phase and liquid as the continuous phase. This foam dispersion system increases the gas-liquid contact area but also hinders the mass transfer rate and reduces the separation efficiency of isopropanol-acetone.

[0042] To address this, the present invention incorporates a cleaning rod 22, which moves the filter cloth 225 toward the downcomer 151. This causes the filter cloth 225 to push the foam on the liquid surface toward the downcomer 151 until the filter cloth 225 contacts the downcomer 151. The filter cloth 225 then crushes the foam blocking the surface, thereby reducing the foam dispersion system. This not only makes the gas-liquid contact more uniform, reduces mass transfer resistance, and improves the separation efficiency of isopropanol-acetone, but also stabilizes the gas-liquid flow, avoids flooding or tower flooding problems, and extends the continuous operation time.

[0043] Acetone is hydrogenated in a reactor to produce a mixture of isopropanol and other products (including isopropanol, unreacted acetone, water, etc.). The mixture is then fed to a gas-liquid separator to separate the gaseous and liquid products. The gaseous product consists of unreacted hydrogen and light gases, while the liquid product includes isopropanol and unreacted acetone. The liquid product is then fed to a preheater and heated to 60-90°C before being fed into a plate distillation column through inlet 13. Since acetone has a boiling point of 56°C, the acetone in the liquid product is heated and vaporized in the preheater. Therefore, after the heated liquid product is fed into the plate distillation column through inlet 13, the heated and vaporized acetone vapor rises within the column body 1.

[0044] Before the preheated liquid product is conveyed to the plate distillation column, the user feeds an azeotropic agent (n-hexane solution) into the column body 1 through inlet 12. The temperature of the azeotropic agent is 60°C, causing it to flow onto tray 15. The azeotropic agent continuously accumulates on tray 15 until its liquid surface overflows the downcomer 151. The azeotropic agent then flows downwards along the side wall of downcomer 151, flowing downcomer 151 to the upper part of the lower tray 15 and accumulating there again until the liquid surface of the azeotropic agent... The azeotropic agent flows down the downcomer 151 on one side of the lower tray 15, continuing to flow down the downcomer 151. This process is repeated until the azeotropic agent reaches the bottom of the column body 1, causing the azeotropic agent surface at the bottom of the column to overflow the outlet 14. At this point, acetone vapor is introduced into the column body 1, causing the acetone vapor to converge at the bottom of the lower tray 15 and the bottom of the column body 1. This causes the acetone vapor to continuously increase the pushing force on the float valve 153 at the upper end of the lower tray 15, until the pushing force of the acetone vapor on the float valve 153 exceeds the azeotropic agent pressure on the float valve 153, at which point the acetone vapor pushes the float valve 153. The float valve 153 rises against the liquid pressure of the azeotropic agent, causing the sieve orifice 152 to open. Acetone vapor then rises through the sieve orifice 152 to the space between the two trays 15. This continues until the pressure of the acetone vapor between the two trays 15 increases, eventually pushing the float valve 153 in the upper tray 15 to open. This allows the acetone vapor between the two trays 15 to continue rising through the sieve orifice 152. This process repeats until the acetone vapor passes through the sieve orifice 152 of the uppermost tray 15 and exits through the outlet 11. The acetone vapor exiting through the outlet 11 is then cooled by the condenser. In the condensation and recovery process, as acetone vapor passes through the sieve 152, it comes into contact with the azeotropic agent at the top of the tray 15. This causes the azeotropic agent (n-hexane solution) to form an azeotrope with the rising acetone vapor (azeotropic temperature 49-50℃). The azeotrope is heated and vaporized, and the vaporized azeotrope passes through the sieve 152 of the upper tray 15 along with the acetone vapor until it passes through the sieve 152 of the uppermost tray 15 and is transported with the acetone vapor from the outlet 11 to the condenser for condensation and recovery, so as to facilitate the subsequent separation of acetone and azeotropic agent.

[0045] As acetone vapor rises, a small amount of vaporized isopropanol rises with it. When the acetone vapor comes into contact with the azeotropic agent, the vaporized isopropanol exchanges heat with the azeotropic agent, causing the vaporized isopropanol to liquefy and flow downwards with the azeotropic agent. When the azeotropic agent reaches the bottom of column 1, the mixture of azeotropic agent and isopropanol is controlled to flow through outlet 14 to the reboiler, where the reboiler heats the mixture of azeotropic agent and isopropanol. Since the boiling point of n-hexane is 68.74℃, the reboiler is controlled to heat the mixture of azeotropic agent and isopropanol to 70-75℃, causing the azeotropic agent to vaporize. The vaporized azeotropic agent is then sent to the condenser for condensation and then sent back to column 1 for reuse. The mixture of isopropanol and water obtained by separation is then dehydrated in a dehydration tower to finally obtain the desired high-purity isopropanol.

[0046] As acetone vapor fed into tower 1 rises and passes through the sieve holes 152 of tray 15, the acetone vapor generates an unstable foam dispersion system due to reverse contact. Initially, a spur gear is fixedly connected to the end of the bevel gear shaft 32 away from tray 15, and a transmission belt is fitted onto the surface of multiple bevel gear shafts 32. Teeth are fixedly connected to the inner wall of the transmission belt, and the transmission belt meshes with the spur gear through the teeth. Therefore, the drive motor 16 can drive the multiple bevel gear shafts 32 to rotate via the transmission belt. Furthermore, the winding rod 31 and the round rod 33 are initially separated, and the locking block 314 is located within the tooth groove 35. The winding rod 31 and the winding drums 34 at both ends are connected via the locking block 314. When the drive motor 16 is controlled... During operation, the drive motor 16 drives the bevel gear ring 311 to rotate via the bevel gear shaft 32, which in turn drives the winding rod 31 fixed to it to rotate. The winding rod 31, through the locking block 314, drives the winding drum 34 to rotate synchronously. The rotating winding drum 34 then drives the metal rope 23 fixed to its surface to rotate synchronously, causing the metal rope 23 to wind around the surface of the winding drum 34. The end of the metal rope 23 away from the winding drum 34 pulls the slider 21 along the arc-shaped groove 2 towards the descending plate 151. This causes the two sliders 21 to drive the lower cleaning rods 22 to move synchronously via the fixing rod 24. The two cleaning rods 22 then drive the filter cloth 225 to move synchronously, allowing the filter cloth to... As the filter cloth 225 moves, it obstructs the foam on the azeotropic liquid surface at the upper end of the lower tray 15, causing the moving filter cloth 225 to push the foam towards the downcomer plate 151 on one side of the tray 15. Since the tray 15 is circular, as the cleaning rod 22 moves the filter cloth 225 towards the downcomer plate 151, the distance between the two cleaning rods 22 first increases and then decreases. The distance between the two cleaning rods 22 is at its maximum when the plane where the two cleaning rods 22 are located is at the center of the tray 15. Therefore, by setting a rotating rod 223 in the cavity 222 and connecting it to the cleaning rod 22 via a coil spring 224, the rotating rod 223 will pull the coil spring 224 when the distance between the cleaning rods 22 increases. The contraction releases the filter cloth 225 on the surface of the rotating rod 223, increasing the length of the filter cloth 225 between the two cleaning rods 22. This ensures that the filter cloth 225 between the two cleaning rods 22 can effectively block the foam between them. When the two cleaning rods 22 approach each other, the contracted coil spring 224 is released. At this time, the rotating rod 223 rotates under the restoring force of the coil spring 224, causing the excess length of the filter cloth 225 between the two cleaning rods 22 to wrap around the surface of the rotating rod 223 as it rotates. This keeps the filter cloth 225 between the two cleaning rods 22 taut, thereby improving the foam blocking and filtration effect of the filter cloth 225.

[0047] Because an overflow weir is installed at the upper end of the tray 15, when the cleaning rod 22 drives the filter cloth 225 to the overflow weir of the tray 15, the lower end of the cleaning rod 22 has a curved chamfer, so the curved chamfer at the lower end of the cleaning rod 22 contacts the overflow weir. This causes the overflow weir to exert an upward pushing force on the cleaning rod 22 through the curved chamfer at the lower end of the cleaning rod 22. This causes the cleaning rod 22 to rise under the resistance of the overflow weir, which in turn causes the cleaning rod 22 to squeeze the fixing spring 26 and rise. This causes the fixing rod 24 to slide relative to the cleaning rod 22 into the fixing groove 25 until the cleaning rod 22 passes the overflow weir. At this time, the cleaning rod 22 returns to its original position under the restoring force of the fixing spring 26. Then, the striking rod drives the filter cloth 225 to contact the downcomer plate 151, causing the foam between the filter cloth 225 and the downcomer plate 151 to be squeezed and broken.

[0048] When the foam is crushed, the hydraulic pump 17 delivers hydraulic oil into the rectangular groove 331. This causes the rectangular rod 332 within the groove 331 to extend out of the groove, allowing it to insert into the slot 312 opposite the groove. The push plate 315 in the slot 312 then compresses the support spring 316, moving it towards the bottom of the slot. Since the slot 312 is filled with hydraulic oil, the oil is pushed by the push plate 315 through the air passage 31. 7. The hydraulic oil flows into the groove 313, causing the locking block 314 inside the groove 313 to be pushed into the groove 313 by the hydraulic oil. This causes the locking block 314 to extend out of the tooth groove 35, separating the winding rod 31 from the winding drum 34. At this time, the winding rod 31 and the winding drum 34 are in a rotatable connection state. The drive motor 16 is controlled to rotate in the opposite direction, causing the drive motor 16 to drive the winding rod 31 to rotate in the opposite direction. The reverse-rotating winding rod 31 drives the round rod 33 to rotate in the opposite direction through the rectangular rod 332. This causes the round rod 33 to drive the steel wire rope 333 on the surface to rotate, causing the steel wire rope 333 to rotate. The wire rope 33 is wound in reverse on the surface of the round rod 33. At this time, the end of the wire rope 333 away from the round rod 33 pulls the slider 21 away from the liquid leveling plate 151, so that the slider 21 drives the cleaning rod 22 to reset under the pull of the wire rope 333. Since the winding rod 31 and the winding drum 34 are in a rotating connection state, when the wire rope 333 pulls the slider 21 to slide along the arc groove 2, the slider 21 will pull the winding drum 34 to rotate through the metal rope 23, so that the metal rope 23 on the surface of the winding drum 34 is released until the slider 21 moves away from the liquid leveling plate 151 in the arc groove 2. At one end, the metal rope 23 is completely released, and then the hydraulic pump 17 is controlled to draw back the hydraulic oil in the rectangular groove 331, so that the rectangular rod 332 is reset. At this time, the winding rod 31 separates from the round rod 33, and the push plate 315 at one end of the winding rod 31 is pushed back by the restoring force of the support spring 316. At this time, the hydraulic oil in the groove 313 flows back to the slot 312. At this time, the locking block 314 extends out of the groove 313 under the pull of negative pressure and inserts into the toothed groove 35 directly opposite it. Then the user controls the drive motor 16 again to perform the next round of foam dispersion system cleaning.

[0049] In one embodiment of the present invention, the side of the liquid-reducing plate 151 near the cleaning rod 22 is provided with an installation groove 18; an airbag 19 is fixedly connected in the installation groove 18.

[0050] In one embodiment of the present invention, the side wall of the arc-shaped groove 2 is provided with an air storage groove 27 that communicates with the mounting groove 18; a sealing plate 271 is slidably and sealingly connected inside the air storage groove 27; the sealing plate 271 is connected to the bottom of the air storage groove 27 by a sealing spring 272.

[0051] In one embodiment of the present invention, a magnet 181 is embedded in the bottom of the mounting groove 18; a metal ball 182 is attracted to one side of the magnet 181; and the metal ball 182 is fixed to the inner wall of the airbag 19 by an elastic rope 183.

[0052] During operation, when the slider 21 moves the cleaning rod 22 close to the liquid-reducing plate 151, the slider 21 first contacts the sealing plate 271, causing the slider 21 to push the sealing plate 271 to compress the sealing spring 272 into the air storage tank 27. This allows the gas in the air storage tank 27 to enter the mounting groove 18, causing the airbag 19 in the mounting groove 18 to inflate. When the sealing plate 271 is fully inside the air storage tank 27, the inflated airbag 19 contacts the filter cloth 225. At this point, the foam between the filter cloth 225 and the airbag 19 is compressed. During the inflation of the airbag 19, the airbag 19 pulls the metal ball 182 via the elastic rope 183. Because the elastic rope 183 is made of thermoplastic polyurethane, it not only has good elasticity but also good heat resistance. Due to the attraction of the magnet 181 to the metal ball 182, when the airbag 19 pulls the metal ball 182 via the elastic rope 183, the elastic rope 183 stretches under the force. When the air bladder 19 comes into contact with the filter cloth 225, the elastic force of the elastic rope 183 is greater than the magnetic attraction force on the metal ball 182. This causes the metal ball 182 to be pulled by the elastic rope 183 and hit the surface of the air bladder 19. The impact of the metal ball 182 causes the air bladder 19 to shake. The shear force or impact force generated by the shaking of the air bladder 19 will directly tear the thin liquid film between the bubbles, thereby accelerating the foam rupture. In addition, the contact between the bulging air bladder 19 and the filter cloth 225 will increase the squeezing force on the foam, thereby improving the foam breaking effect. After the cleaning rod 22 is reset, the slider 21 passes over the sealing plate 271. At this time, the sealing plate 271 is reset under the push of the restoring force of the sealing spring 272, which causes the gas in the mounting groove 18 to flow back into the air storage groove 27, and the bulging air bladder 19 is restored. At this time, the air bladder 19 drives the metal ball 182 to approach the magnet 181, so that the metal ball 182 is attached to the magnet 181 and reset by the magnetic attraction force of the magnet 181.

[0053] A purification process for high-purity isopropanol, applicable to the aforementioned high-purity isopropanol purification apparatus, comprises the following steps:

[0054] S1: The mixture containing isopropanol produced by the hydrogenation reaction of acetone is sent to the gas-liquid separator to separate the liquid product containing isopropanol and acetone. The liquid product is heated to 60-90°C by the preheater. At the same time, an azeotropic agent at 60°C is sent into the tower body 1 until the azeotropic agent is evenly discharged from the outlet 14 at the bottom of the tower body 1. The preheater is controlled to send the heated liquid product into the tower body 1 through the feed inlet 13.

[0055] S2: After the liquid product heated by the preheater is delivered into the tower body 1, the drive motor 16 is controlled to drive the winding rod 31 to rotate in the forward direction, so that the winding rod 31 pulls the slider 21 through the metal rope 23 and drives the cleaning rod 22 to move towards the liquid downcomer 151, so that the cleaning rod 22 pushes the foam on the surface of the azeotropic agent to the liquid downcomer 151 through the filter cloth 225, so that the foam is squeezed and broken by the filter cloth 225 and the air bag 19 on one side of the liquid downcomer 151;

[0056] S3: After the foam is completely broken, control the hydraulic pump 17 to deliver hydraulic oil into the rectangular groove 331 at one end of the round rod 33, so that the round rod 33 is connected to the winding rod 31 through the rectangular rod 332 in the rectangular groove 331. Control the drive motor 16 to drive the winding rod 31 to rotate in the opposite direction, so that the winding rod 31 drives the wire rope 333 through the round rod 33 to pull the slider 21 to reset, so that the slider 21 drives the cleaning rod 22 to reset.

[0057] S4: As the liquid product heated by the preheater is transported into tower 1, the gaseous product discharged from the outlet 11 of tower 1 is transported to the condenser for condensation. The liquid product at the bottom of tower 1 is transported to the reboiler for heating at a temperature of 70-75℃. The heated vaporized azeotropic agent is transported to the condenser for condensation and then transported back into tower 1 for recycling. The mixture of isopropanol and water obtained by separation is dehydrated by the dehydration tower to finally obtain the required high-purity isopropanol.

[0058] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A purification device of high purity isopropyl alcohol, comprising a hydrogenation reactor, a gas-liquid separator, a preheater, a plate rectification tower, a reboiler, a condenser and a dehydration tower, characterized in that: The plate rectifying tower comprises a tower body (1), the tower body (1) is sequentially provided with a gas outlet (11), a liquid inlet (12), a feed inlet (13) and a discharge outlet (14) from top to bottom, a tray (15) is installed in the tower body (1), a downcomer (151) is installed on one side of the tray (15), sieve holes (152) are formed on the surface of the tray (15), and floating valves (153) are slidably installed in the sieve holes (152). Two opposite arc-shaped grooves (2) are formed at the lower end of the tray (15), a sliding block (21) is slidably connected in the arc-shaped groove (2), a cleaning rod (22) is installed at the lower end of the sliding block (21), a strip-shaped groove (221) is formed on the surface of the cleaning rod (22), a cavity (222) is formed in the cleaning rod (22) and communicates with the strip-shaped groove (221), a rotating rod (223) is rotatably connected in the cavity (222), the lower end of the rotating rod (223) is connected with the cleaning rod (22) through a coil spring (224), a filter cloth (225) is arranged between adjacent two cleaning rods (22), the two ends of the filter cloth (225) are connected with the rotating rods (223) in the two cleaning rods (22) respectively, and a traction module is installed in the arc-shaped groove (2).

2. The purification device of high purity isopropyl alcohol according to claim 1, characterized in that: The traction module comprises a metal rope (23), a concave cavity (3) is formed in the tray (15), a winding rod (31) is rotatably connected in the concave cavity (3), one end of the metal rope (23) is connected with the winding rod (31), the other end is connected with the sliding block (21), a bevel gear ring (311) is fixedly connected to the surface of the winding rod (31), a bevel gear shaft (32) is arranged on one side of the bevel gear ring (311) and meshes with the bevel gear ring (311), the bevel gear shaft (32) is rotatably connected with the tower body (1), a driving motor (16) is installed on one side of the tower body (1), the driving motor (16) is used for driving the bevel gear shaft (32) to rotate, and a reset unit is installed in the concave cavity (3).

3. The purification device of high purity isopropyl alcohol according to claim 2, characterized in that: The reset unit comprises a round rod (33), the round rod (33) is rotatably connected in the concave cavity (3), a rectangular groove (331) is formed at one end of the round rod (33) close to the winding rod (31), a rectangular rod (332) is slidably connected in the rectangular groove (331), an insertion groove (312) is formed at one end of the winding rod (31) close to the round rod (33), a hydraulic pump (17) is installed on one side of the tower body (1), the hydraulic pump (17) communicates with the rectangular groove (331) through a connecting pipe (171), a steel wire rope (333) is fixedly connected to the end of the sliding block (21) away from the metal rope (23), and the end of the steel wire rope (333) away from the sliding block (21) is fixedly connected with the round rod (33).

4. The purification device of high purity isopropyl alcohol according to claim 3, characterized in that: The reset unit further comprises a winding drum (34); the winding drum (34) is rotationally connected on the surface of the winding rod (31); the inner wall of the winding drum (34) is provided with a tooth groove (35); the surface of the winding rod (31) is provided with a groove (313) opposite to the tooth groove (35); the groove (313) is slidably connected with a clamping block (314); the insertion groove (312) is slidably and sealingly connected with a push plate (315); the push plate (315) and the groove bottom of the insertion groove (312) are connected through a supporting spring (316); the insertion groove (312) and the groove (313) are communicated through an air channel (317); one end of the metal rope (23) away from the sliding block (21) is connected with the winding drum (34).

5. A purification device of high purity isopropyl alcohol according to claim 4, characterized by: The fixed rod (24) is arranged between the cleaning rod (22) and the sliding block (21); the fixed rod (24) is fixedly connected with the sliding block (21); the upper end of the cleaning rod (22) is provided with a fixed groove (25); the fixed rod (24) is slidably connected in the fixed groove (25); the fixed rod (24) and the groove bottom of the fixed groove (25) are connected through a fixed spring (26).

6. A purification device of high purity isopropyl alcohol according to claim 5, characterized by: The side of the downcomer plate (151) close to the cleaning rod (22) is provided with a mounting groove (18); the mounting groove (18) is fixedly connected with an air bag (19).

7. A purification device of high purity isopropyl alcohol according to claim 6, characterized by: The side wall of the arc-shaped groove (2) is provided with a gas storage groove (27) communicated with the mounting groove (18); the gas storage groove (27) is slidably and sealingly connected with a sealing plate (271); the sealing plate (271) and the groove bottom of the gas storage groove (27) are connected through a sealing spring (272).

8. The purification device of high purity isopropyl alcohol according to claim 7, characterized in that: The groove bottom of the mounting groove (18) is inlaid with a magnet (181); one side of the magnet (181) is adsorbed with a metal ball (182); the metal ball (182) is fixedly connected with the inner wall of the air bag (19) through an elastic rope (183).

9. A process for purifying high purity isopropanol, the process being suitable for use in a plant for purifying high purity isopropanol as claimed in claim 8, characterised in that: The steps of the process are as follows: S1: The mixture containing isopropyl alcohol generated by the acetone hydrogenation reaction is transported to a gas-liquid separator to separate a liquid phase product containing isopropyl alcohol and acetone, and the liquid phase product is heated to 60-90℃ by a preheater, while the azeotrope at 60℃ is transported into the tower body (1), and the azeotrope is uniformly discharged from the discharge port (14) at the bottom of the tower body (1), and the preheater is controlled to transport the heated liquid phase product into the tower body (1) through the feed port (13); S2: when the liquid phase product heated by the preheater is transported into the tower body (1), the driving motor (16) is controlled to drive the winding rod (31) to rotate in the forward direction, so that the winding rod (31) pulls the sliding block (21) through the metal rope (23) to drive the cleaning rod (22) to move towards the downcomer plate (151), so that the cleaning rod (22) pushes the foam of the azeotrope liquid surface to the downcomer plate (151) through the filter cloth (225), so that the foam is crushed by the filter cloth (225) and the air bag (19) on one side of the downcomer plate (151). S3: When the foam is completely broken, control the hydraulic pump (17) to deliver hydraulic oil into the rectangular groove (331) at one end of the round rod (33), so that the round rod (33) is connected with the winding rod (31) through the rectangular rod (332) in the rectangular groove (331), control the driving motor (16) to drive the winding rod (31) to rotate reversely, so that the winding rod (31) drives the steel wire rope (333) to pull the sliding block (21) to reset, so that the sliding block (21) drives the cleaning rod (22) to reset; S4: As the liquid phase product heated by the preheater is delivered into the tower body (1), the gas phase product discharged from the gas outlet (11) of the tower body (1) is delivered to the condenser for condensation treatment, and the liquid phase product at the bottom of the tower body (1) is delivered to the reboiler for heating, the heating temperature is 70-75℃, the heated vaporization azeotrope is delivered to the condenser for condensation, then delivered to the tower body (1) for recycling, and the obtained mixture of isopropyl alcohol and water is delivered to the dehydration tower for dehydration treatment, and finally the required high-purity isopropyl alcohol is obtained.

Images