High-purity isopropanol purification device and process thereof

Abstract

The invention relates to the technical field of isopropanol purification, in particular to a high-purity isopropanol purification device and process. Comprising a hydrogenation reactor, a gas-liquid separator, a preheater, a plate-type rectifying tower, a reboiler, a condenser and a dehydrating tower, wherein the plate-type rectifying tower comprises a tower body; the tower body is sequentially provided with a gas outlet, a liquid inlet, a material inlet and a material outlet from top to bottom; a tower tray is mounted in the tower body; a downcomer plate is mounted on one side of the tower tray; by arranging the cleaning rod, the cleaning rod drives the filter cloth to move towards the downcomer plate, so that the filter cloth pushes foam on the liquid level to synchronously move towards the downcomer plate until the filter cloth is in contact with the downcomer plate, and the foam blocked on the surface is extruded and broken by the filter cloth, so that a foam dispersion system is reduced, the gas-liquid contact is more uniform, and the gas-liquid separation efficiency is improved. The mass transfer resistance is reduced, the isopropanol-acetone separation efficiency is improved, the gas-liquid flow is stabilized, the problem of flooding or tower flooding is avoided, and the continuous operation time is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of isopropyl alcohol purification, in particular to a high-purity isopropyl alcohol purification device and a process thereof. Background Art

[0002] Isopropyl alcohol, with the molecular formula (CH3)2CHOH, is a colorless, transparent, volatile liquid that is miscible with ethanol, ether, chloroform, and water. Isopropyl alcohol is an excellent organic solvent that is used not only as a solvent for shellac, nitrocellulose, alkaloids, rubber, and oils, but also as a raw material for synthesizing glycerol, isopropyl acetate, and acetone. It has a wide range of uses in pesticides, electronics, medicine, coatings, daily chemicals, and organic synthesis. Isopropyl alcohol is synthesized by acetone hydrogenation, where acetone is hydrogenated in the presence of a copper or nickel-based catalyst to produce isopropyl alcohol. However, the resulting isopropyl alcohol contains unreacted acetone, necessitating separation and purification of the isopropyl alcohol-acetone mixture. Because acetone has a boiling point of approximately 56.5°C, while isopropyl alcohol has a boiling point of 82.5°C, resulting in a boiling point difference of 26°C between the two, and the absence of azeotropy, a plate distillation column can be used for fractional distillation and separation. 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 tower with several trays arranged horizontally at regular intervals within the tower. It is widely used for distillation and absorption. However, when using existing plate-type distillation towers, an azeotropic agent (such as n-hexane) is added to the top of the tower to form an acetone-entrainer azeotrope (azeotropic temperature 49-50°C). After condensation and liquid separation, the acetone is separated, and the unreacted acetone and light components are withdrawn from the top of the tower. The entrainer is recycled. When the entrainer (such as n-hexane) flows from top to bottom and contacts the ascending gas phase (vaporized isopropyl alcohol-acetone mixture) in the opposite direction, 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. While the foam dispersion system increases the gas-liquid contact area, it also hinders the mass transfer rate, reducing the isopropyl alcohol-acetone separation efficiency. In view of this, in order to overcome the above technical problems, the present invention proposes a purification device and process for high-purity isopropyl alcohol, which solves the above technical problems. Summary of the Invention

[0003] To overcome the deficiencies of the prior art, the present invention provides a high-purity isopropyl alcohol purification device and process thereof. A cleaning rod is provided to drive the filter cloth toward the downcomer, causing the filter cloth to simultaneously push the foam on the liquid surface toward the downcomer until the filter cloth contacts the downcomer. The filter cloth crushes the foam blocked by the surface, thereby reducing the foam dispersion. This not only makes gas-liquid contact more uniform, reduces mass transfer resistance, and improves the isopropyl alcohol-acetone separation efficiency, but also stabilizes gas-liquid flow, avoids flooding or tower flooding, and extends continuous operation time.

[0004] The technical solution adopted by the present invention to solve the technical problem is as follows: a high-purity isopropyl alcohol purification device according to the present invention comprises a hydrogenation reactor, a gas-liquid separator, a preheater, a plate-type distillation tower, a reboiler, a condenser and a dehydration tower, wherein the plate-type distillation tower comprises a tower body; the tower body is provided with a gas outlet, a liquid inlet, a feed inlet and a discharge in sequence from top to bottom; a tower tray is installed in the tower body; a downcomer is installed on one side of the tower tray; a sieve hole is provided on the surface of the tower tray; a float valve is slidably installed in the sieve hole; The lower end of the tower plate is provided with two opposite arc-shaped grooves; a slider is slidably connected in the arc-shaped groove; a cleaning rod is installed at the lower end of the slider, and a strip groove is provided on the surface of the cleaning rod; a cavity connected to the strip groove is provided inside the cleaning rod; a rotating rod is rotatably connected in the cavity; the lower end of the rotating rod is connected to the cleaning rod through a coil spring; a filter cloth is provided between two adjacent cleaning rods; the two ends of the filter cloth are respectively connected to the rotating rods in the two cleaning rods; a traction module is installed in the arc-shaped groove; the traction module is used to pull the slider to slide in the arc-shaped groove.

[0005] Preferably, the traction module includes a metal rope; a concave cavity is opened inside the tray; a winding rod is rotatably connected in the concave 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 of the bevel gear ring; 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 in the concave cavity; the reset unit is used to pull the slider in the arc groove to reset.

[0006] Preferably, the reset unit includes a round rod; the round rod is rotatably connected in the concave cavity; a rectangular groove is provided at one end of the round rod close to the winding rod; a rectangular rod is slidably connected in the rectangular groove; a slot is provided at one end of the winding rod close to the round rod; a hydraulic pump is installed on one side of the 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; and the steel wire rope is fixedly connected to the round rod at one end away from the slider.

[0007] Preferably, the reset unit also includes a winding drum; the winding drum is rotatably connected to the surface of the winding rod; a tooth groove is provided on the inner wall of the winding drum; a groove opposite to the tooth groove is provided on the surface of the winding rod; a clamping 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 supporting spring; the slot and the groove are connected by an airway; the end of the metal rope away from the slider is connected to the winding drum.

[0008] 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; the fixing rod is connected to the bottom of the fixing groove by a fixing spring.

[0009] Preferably, a mounting groove is provided on a side of the downcomer plate close to the cleaning rod; an air bag is fixedly connected in the mounting groove.

[0010] Preferably, the side wall of the arc-shaped groove is provided with an air storage groove connected to the mounting groove; a sealing plate is slidingly and sealingly connected in the air storage groove; the sealing plate is connected to the bottom of the air storage groove via a sealing spring.

[0011] Preferably, a magnet is embedded in the bottom of the mounting groove; a metal ball is adsorbed on one side of the magnet; and the metal ball is fixedly connected to the inner wall of the airbag via an elastic rope.

[0012] A high-purity isopropyl alcohol purification process is applicable to the above-mentioned high-purity isopropyl alcohol purification device, and the steps of the process are as follows: S1: The isopropanol-containing mixture produced by the acetone hydrogenation reaction is transported to a gas-liquid separator to separate and obtain a liquid product containing isopropanol and acetone. The liquid product is heated to 60-90°C by a preheater. At the same time, an entrainer at 60°C is transported into the tower body until the entrainer is evenly discharged from the outlet at the bottom of the tower body. The preheater is controlled to transport the heated liquid product into the tower body through the feed port. S2: After the liquid product heated by the preheater is transported into the tower, the drive motor is controlled to drive the take-up rod to rotate in the forward direction, so that the take-up rod pulls the slider through the metal rope to drive the cleaning rod to move toward the downcomer. The cleaning rod pushes the foam on the azeotropic agent liquid surface to the downcomer through the filter cloth, so that the foam is squeezed and crushed by the filter cloth and the air bag on one side of the downcomer. S3: When the foam is completely broken, the hydraulic pump is controlled to deliver hydraulic oil into the rectangular groove at one end of the round rod, so that the round rod is connected to the reeling rod through the rectangular rod in the rectangular groove. The driving motor is controlled to drive the reeling rod to rotate in the opposite direction, so that the reeling 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; S4: As the liquid product heated by the preheater is transported into the tower body, the gaseous product discharged from the tower body outlet is transported to the condenser for condensation treatment, and the liquid product at the bottom of the tower body is transported to the reboiler for heating at a temperature of 70-75°C. The heated vaporized entrainer is transported to the condenser for condensation and then transported into the tower body for recycling. The separated mixture of isopropyl alcohol and water is dehydrated through a dehydration tower to finally obtain the required high-purity isopropyl alcohol.

[0013] The beneficial effects of the present invention are as follows: 1. The present invention provides a cleaning rod, which drives the filter cloth to move toward the downcomer. The filter cloth pushes the foam on the liquid surface toward the downcomer until the filter cloth contacts the downcomer. The filter cloth crushes the foam blocked by the surface, thereby reducing the foam dispersion. This not only makes the gas-liquid contact more uniform, reduces mass transfer resistance, and improves the isopropyl alcohol-acetone separation efficiency, but also stabilizes the gas-liquid flow, avoids flooding or tower flooding, and extends the continuous operation time.

[0014] 2. The present invention connects the rotating rod with the cleaning rod through a coil spring in the cavity, so that when the distance between the cleaning rods increases, the rotating rod will pull the coil spring to contract, so that the filter cloth on the surface of the rotating rod is released. At this time, the length of the filter cloth between the two cleaning rods increases to ensure that the filter cloth between the two cleaning rods can effectively block the foam between the two cleaning rods. When the two cleaning rods approach each other, the contracted coil spring is released. At this time, the rotating rod rotates under the push of the restoring force of the coil spring, so that the excess length of the filter cloth between the two cleaning rods is wound around the surface of the rotating rod as the rotating rod rotates, so that the filter cloth between the two cleaning rods can always be kept taut, thereby improving the filter cloth's blocking and filtering effect on foam. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0016] Figure 1 is a perspective view of a plate-type distillation column used in the present invention; Figure 2 is a partial cross-sectional view of a plate-type distillation tower used in the present invention; Figure 3 yes Figure 2 Enlarged view of point A in the middle; Figure 4 is a partial cross-sectional view of a tower tray used in the present invention; Figure 5 yes Figure 4 Enlarged view of point B in the middle; Figure 6 yes Figure 4 Enlarged view of point C in the middle; Figure 7Schematic diagram of the transmission of the slider used in the present invention; Figure 8 It is a process flow chart of the present invention; In the figure: 1. tower body; 11. air outlet; 12. liquid inlet; 13. feed inlet; 14. discharge outlet; 15. tower tray; 151. downcomer; 152. sieve hole; 153. float valve; 16. drive motor; 17. hydraulic pump; 171. connecting pipe; 18. mounting groove; 181. magnet; 182. metal ball; 183. elastic rope; 19. air bag; 2. arc 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. Air storage tank; 271. Sealing plate; 272. Sealing spring; 3. Concave cavity; 31. Winding rod; 311. Bevel gear ring; 312. Slot; 313. Groove; 314. Block; 315. Push plate; 316. Support spring; 317. Air duct; 32. Bevel gear shaft; 33. Round rod; 331. Rectangular groove; 332. Rectangular rod; 333. Wire rope; 34. Winding drum; 35. Tooth groove. DETAILED DESCRIPTION

[0017] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0018] like Figures 1 to 8 As shown, a high-purity isopropyl alcohol purification device according to the present invention includes a hydrogenation reactor, a gas-liquid separator, a preheater, a plate distillation tower, a reboiler, a condenser and a dehydration tower. The plate distillation tower includes a tower body 1; the tower body 1 is provided with a gas outlet 11, a liquid inlet 12, a feed inlet 13 and a discharge port 14 from top to bottom; a tower tray 15 is installed in the tower body 1; a downcomer 151 is installed on one side of the tower tray 15; a sieve hole 152 is provided on the surface of the tower tray 15; a float valve 153 is slidably installed in the sieve hole 152; The lower end of the tower plate 15 is provided with two opposite arc-shaped grooves 2; a slider 21 is slidably connected in the arc-shaped groove 2; a cleaning rod 22 is installed at the lower end of the slider 21, and a strip groove 221 is provided on the surface of the cleaning rod 22; a cavity 222 connected to the strip groove 221 is provided inside the cleaning rod 22; a rotating rod 223 is rotatably connected in the cavity 222; the lower end of the rotating rod 223 is connected to the cleaning rod 22 by a coil spring 224; a filter cloth 225 is provided between two adjacent cleaning rods 22; the two ends of the filter cloth 225 are respectively connected to the rotating rods 223 in the two cleaning rods 22; a traction module is installed in the arc-shaped groove 2; the traction module is used to pull the slider 21 to slide in the arc-shaped groove 2.

[0019] As an embodiment of the present invention, the traction module includes a metal rope 23; a concave cavity 3 is opened inside the tray; a winding rod 31 is rotatably connected in the concave 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 it is provided on one side of the bevel gear ring 311; 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 in the concave cavity 3; the reset unit is used to pull the slider 21 in the arc groove 2 to reset.

[0020] As an embodiment of the present invention, the reset unit includes a round rod 33; the round rod 33 is rotatably connected in the concave cavity 3; a rectangular groove 331 is provided 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; a slot 312 is provided 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 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 the end of the slider 21 away from the metal rope 23; the end of the steel wire rope 333 away from the slider 21 is fixedly connected to the round rod 33.

[0021] As an embodiment of the present invention, the reset unit also includes a winding drum 34; the winding drum 34 is rotatably connected to the surface of the winding rod 31; a tooth groove 35 is provided on the inner wall of the winding drum 34; a groove 313 opposite to the tooth groove 35 is provided on the surface of the winding rod 31; a block 314 is slidably connected in the groove 313; a push plate 315 is slidably and sealedly 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 airway 317; the end of the metal rope 23 away from the slider 21 is connected to the winding drum 34.

[0022] As an 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 opened 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.

[0023] During operation, an existing plate distillation tower is used. An entrainer (such as n-hexane) is added to the top of the tower to form an acetone-entrainer azeotrope (azeotropic temperature 49-50°C). After condensation and liquid separation, the acetone is separated, and the unreacted acetone and light components are withdrawn from the top of the tower. The entrainer is recycled. When the entrainer (such as n-hexane) flows from top to bottom and contacts the ascending gas phase (vaporized isopropyl alcohol-acetone mixture) in the opposite direction, 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. While the foam dispersion system increases the gas-liquid contact area, it also hinders the mass transfer rate, reducing the isopropyl alcohol-acetone separation efficiency.

[0024] To this end, the present invention provides a cleaning rod 22, so that the cleaning rod 22 drives the filter cloth 225 to move toward the downcomer 151, so that the filter cloth 225 pushes the foam on the liquid surface to move synchronously toward the downcomer 151 until the filter cloth 225 contacts the downcomer 151, so that the filter cloth 225 squeezes and breaks the foam blocked by the surface, thereby reducing the foam dispersion. This not only makes the gas-liquid contact more uniform, reduces the mass transfer resistance, and improves the isopropyl alcohol-acetone separation efficiency, but also stabilizes the gas-liquid flow, avoids liquid flooding or tower flooding, and extends the continuous operation time.

[0025] Acetone is hydrogenated in a reactor to generate an isopropanol-containing mixture product (including isopropanol, unreacted acetone, water, etc.). The isopropanol-containing mixture product is transported to a gas-liquid separator for separation to obtain a gaseous product and a liquid product. The gaseous product is unreacted hydrogen and light gases, and the liquid product includes isopropanol and unreacted acetone. The liquid product is transported to a preheater and heated to 60-90°C, and then transported to a plate distillation tower through a feed port 13. Since the boiling point of acetone is 56°C, the acetone in the liquid product is heated and vaporized in the preheater. Therefore, after the preheater transports the heated liquid product to the plate distillation tower through a feed port 13, the heated and vaporized acetone vapor rises in the tower body 1.

[0026] Before the liquid product heated by the preheater is transported to the plate distillation tower, the user transports the entrainer (n-hexane solution) into the tower body 1 through the liquid inlet 12. The temperature of the transported entrainer is 60°C, so that the entrainer flows to the tower tray 15 and continuously gathers on the tower tray 15 until the liquid level of the entrainer overflows the downcomer 151, so that the entrainer flows downward along the side wall of the downcomer 151, thereby causing the entrainer to flow along the downcomer 151 to the upper end of the tower tray 15 below and gather at the upper end of the tower tray 15 below until the liquid level of the entrainer is again The azeotropic agent flows over the downcomer 151 on one side of the lower tray 15, so that the entrainer continues to flow down along the downcomer 151, and this process is repeated until the entrainer flows to the bottom of the tower body 1, so that the azeotropic agent liquid level at the bottom of the tower overflows the discharge port 14. At this time, acetone vapor is transported into the tower body 1, so that the acetone vapor converges at the bottom of the tower body 1 and the bottom of the tower body 1, so that the push force of the acetone vapor on the float valve 153 at the upper end of the lower tray 15 continues to increase, until the push force of the acetone vapor on the float valve 153 is greater than the pressure of the entrainer on the float valve 153, and the acetone vapor pushes The float valve 153 overcomes the rising pressure of the entrainer liquid, causing the sieve holes 152 to open. At this time, the acetone vapor passes through the sieve holes 152 and rises between the two trays 15 until the pressure of the acetone vapor between the two trays 15 increases, until the acetone vapor pushes the float valve 153 in the upper tray 15 to open, thereby causing the acetone vapor between the two trays 15 to continue to rise through the sieve holes 152. This process is repeated until the acetone vapor passes through the sieve holes 152 of the uppermost tray 15 and is discharged from the gas outlet 11. The acetone vapor discharged from the gas outlet 11 is cooled by the condenser. Condensation recovery: During the process of the acetone vapor passing through the sieve holes 152, the acetone vapor contacts the entrainer on the upper end of the tray 15, so that the entrainer (n-hexane solution) and the rising acetone vapor form an azeotrope (azeotropic temperature 49-50°C). The azeotrope is heated and vaporized, and the vaporized azeotrope passes through the sieve holes 152 of the upper tray 15 along with the acetone vapor until the vaporized azeotrope passes through the sieve holes 152 of the uppermost tray 15 and is transported to the condenser through the gas outlet 11 along with the acetone vapor for condensation recovery, so as to facilitate the subsequent separation treatment of the acetone and the entrainer.

[0027] As the acetone vapor rises, a small amount of vaporized isopropyl alcohol rises with the acetone vapor. When the acetone vapor contacts the entrainer, the vaporized isopropyl alcohol exchanges heat with the entrainer, causing the vaporized isopropyl alcohol to liquefy and flow downward with the entrainer. After the entrainer flows to the bottom of the tower body 1, the entrainer and isopropyl alcohol mixture is controlled to flow to the reboiler through the discharge port 14, so that the reboiler heats the entrainer and isopropyl alcohol mixture. Since the boiling point of n-hexane is 68.74° C., the reboiler is controlled to heat the entrainer and isopropyl alcohol mixture to 70-75° C. to vaporize the entrainer. The vaporized entrainer is transported to the condenser for condensation and then transported to the tower body 1 for reuse. The separated isopropyl alcohol and water mixture is dehydrated through a dehydration tower to ultimately obtain the desired high-purity isopropyl alcohol.

[0028] As the acetone vapor transported into the tower body 1 rises and passes through the sieve holes 152 of the tower plate 15, the acetone vapor generates an unstable foam dispersion system due to reverse contact. In the initial state, the bevel gear shaft 32 is fixedly connected to a spur gear at one end away from the tower plate 15, and a transmission belt is provided on the surface of the multiple bevel gear shafts 32; the inner wall of the transmission belt is fixedly connected to teeth, and the transmission belt is engaged with the spur gear through the teeth, so that the drive motor 16 can drive the multiple bevel gear shafts 32 to rotate through the transmission belt. In addition, the winding rod 31 and the round rod 33 are in a separated state in the initial state, and the clamping block 314 is located in the tooth groove 35. The winding rod 31 and the winding drum 34 at both ends are plugged in through the clamping block 314. When the control drive motor 16 is controlled The cam 32 is rotated by the bevel gear 311, and the cam 32 is rotated by the bevel gear 311. The cam 32 is rotated by the bevel gear 311, and the cam 32 is rotated by the bevel gear 311. The cam 32 is rotated by the bevel gear 311, and the cam 32 is rotated by the bevel gear 311. The cam 32 is rotated by the bevel gear 311, and the cam 32 is rotated by the bevel gear 311. During the movement, the cloth 225 blocks the foam on the azeotropic agent liquid surface at the upper end of the tower tray 15 below, so that the moving filter cloth 225 pushes the foam to move toward the downcomer 151 on the side of the tower tray 15. Since the tower tray 15 is circular, when the cleaning rod 22 drives the filter cloth 225 to move toward the downcomer 151, the distance between the two cleaning rods 22 first increases and then decreases. When the plane where the two cleaning rods 22 are located is at the center of the tower tray 15, the distance between the two cleaning rods 22 is the largest. Therefore, by setting a rotating rod 223 in the cavity 222 and connecting it to the cleaning rod 22 through a coil spring 224, when the distance between the cleaning rods 22 increases, the rotating rod 223 will pull the coil spring 224 The contraction of the coil spring 224 releases the filter cloth 225 on the surface of the rotating rod 223. At this time, the length of the filter cloth 225 between the two cleaning rods 22 increases to ensure that the filter cloth 225 between the two cleaning rods 22 can effectively block the foam between the two cleaning rods 22. 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 push of the restoring force of the coil spring 224, so that the excess length of the filter cloth 225 between the two cleaning rods 22 is wound around the surface of the rotating rod 223 as the rotating rod 223 rotates, so that the filter cloth 225 between the two cleaning rods 22 can always be kept taut, thereby improving the blocking and filtering effect of the filter cloth 225 on foam.

[0029] Since an overflow weir is installed at the upper end of the tower tray 15, when the cleaning rod 22 drives the filter cloth 225 to the overflow weir of the tower tray 15, since the lower end of the cleaning rod 22 is provided with a curved chamfer, the curved chamfer at the lower end of the cleaning rod 22 contacts the overflow weir, so that the overflow weir generates an oblique upward pushing force on the cleaning rod 22 through the curved chamfer at the lower end of the cleaning rod 22, so that the cleaning rod 22 rises under the action of the blocking force of the overflow weir, so that the cleaning rod 22 squeezes the fixing spring 26 to rise, so that the fixing rod 24 slides relative to the cleaning rod 22 into the fixing groove 25 until the cleaning rod 22 passes over the overflow weir. At this time, the cleaning rod 22 is reset under the action of the restoring force of the fixing spring 26, and then the knocking rod drives the filter cloth 225 to contact the downcomer 151, so that the foam between the filter cloth 225 and the downcomer 151 is squeezed and broken.

[0030] When the foam is squeezed and broken, the hydraulic pump 17 is controlled to deliver hydraulic oil into the rectangular groove 331, so that the rectangular rod 332 in the rectangular groove 331 is pushed out of the rectangular groove 331 by the hydraulic oil, so that the rectangular rod 332 that has stretched out of the rectangular groove 331 can be inserted into the slot 312 opposite to the rectangular groove 331, so that the push plate 315 in the slot 312 squeezes the support spring 316 and moves toward the bottom of the slot 312. Since the slot 312 is filled with hydraulic oil, the hydraulic oil in the slot 312 is pushed by the push plate 315 and moves through the air channel 31 7 flows into the groove 313, so that the block 314 in the groove 313 is pushed by the hydraulic oil and enters the groove 313, so that the block 314 extends out of the tooth groove 35, so that the winding rod 31 is separated from the winding drum 34. At this time, the winding rod 31 and the winding drum 34 are in a rotational connection state, and the drive motor 16 is controlled to rotate in the opposite direction, so that the drive motor 16 drives the winding rod 31 to rotate in the opposite direction, so that the reverse rotating winding rod 31 drives the round rod 33 to rotate in the opposite direction through the rectangular rod 332, so that the round rod 33 drives the surface steel wire rope 333 to rotate, so that the steel wire rope 33 The wire rope 333 is wound around the surface of the round rod 33 in the opposite direction. At this time, the end of the wire rope 333 away from the round rod 33 pulls the slider 21 away from the liquid drop plate 151, so that the slider 21 drives the cleaning rod 22 to reset under the pull of the wire rope 333. Since the reeling rod 31 and the reeling drum 34 are in a rotational connection state, when the wire rope 333 pulls the slider 21 to slide along the arc groove 2, the slider 21 will pull the reeling drum 34 to rotate through the metal rope 23, so that the metal rope 23 on the surface of the reeling drum 34 is released until the slider 21 moves to the arc groove 2 away from the liquid drop plate 151. At one end, the metal rope 23 is completely released, and then the hydraulic pump 17 is controlled to pump back the hydraulic oil in the rectangular groove 331, so that the rectangular rod 332 is reset. At this time, the winding rod 31 is separated from the round rod 33, and the push plate 315 at one end of the winding rod 31 is pushed and reset 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 block 314 extends out of the groove 313 under the pull of the negative pressure and is inserted into the tooth groove 35 opposite to it. Then the user controls the drive motor 16 again to carry out the next round of cleaning of the foam dispersion system.

[0031] As an embodiment of the present invention, a mounting groove 18 is formed on a surface of the downcomer 151 close to the cleaning rod 22 ; an air bag 19 is fixedly connected to the mounting groove 18 .

[0032] As an embodiment of the present invention, the side wall of the arc-shaped groove 2 is provided with an air storage groove 27 connected to the mounting groove 18; a sealing plate 271 is slidingly sealed in 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.

[0033] As an embodiment of the present invention, a magnet 181 is embedded in the bottom of the mounting groove 18 ; a metal ball 182 is adsorbed on one side of the magnet 181 ; and the metal ball 182 is fixedly connected to the inner wall of the airbag 19 via an elastic rope 183 .

[0034] During operation, when the slider 21 drives the cleaning rod 22 to approach the downcomer 151, the slider 21 will first contact the sealing plate 271, so that the slider 21 pushes the sealing plate 271 to squeeze the sealing spring 272 into the air storage tank 27, so that the gas in the air storage tank 27 enters the mounting groove 18, causing the air bag 19 in the mounting groove 18 to inflate and swell. Until the sealing plate 271 completely enters the air storage tank 27, the swollen air bag 19 contacts the filter cloth 225. At this time, the foam between the filter cloth 225 and the air bag 19 is squeezed, and in the process of the air bag 19 swelling, the air bag 19 will pull the metal ball 182 through the elastic rope 183. Since the elastic rope 183 is made of thermoplastic polyurethane material, the elastic rope 183 not only has good elasticity but also has good heat resistance. Since the metal ball 182 is attracted by the magnet 181, when the air bag 19 pulls the metal ball 182 through the elastic rope 183, the elastic rope 183 will be stretched due to the force. When the cleaning rod 22 is about to come into contact with the filter cloth 225, the elastic force of the elastic rope 183 is greater than the magnetic attraction force exerted on the metal ball 182, causing the metal ball 182 to be pulled by the elastic rope 183 and collide with the surface of the airbag 19, causing the airbag 19 to vibrate due to the impact of the metal ball 182. The shear force or impact force generated by the vibration of the airbag 19 directly tears the thin liquid film between the bubbles, thereby accelerating the foam bursting. In addition, the contact between the bulging airbag 19 and the filter cloth 225 increases 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 force of the sealing spring 272, causing the gas in the installation groove 18 to flow back into the air storage tank 27, causing the bulging airbag 19 to recover. At this time, the airbag 19 drives the metal ball 182 close to the magnet 181, causing the metal ball 182 to be pressed against the magnet 181 and reset under the action of the magnetic attraction force of the magnet 181.

[0035] A high-purity isopropyl alcohol purification process is applicable to the above-mentioned high-purity isopropyl alcohol purification device, and the steps of the process are as follows: S1: The isopropanol-containing mixture produced by the acetone hydrogenation reaction is transported to a gas-liquid separator to separate and obtain a liquid product containing isopropanol and acetone. The liquid product is heated to 60-90°C by a preheater. At the same time, an entrainer at 60°C is transported into the tower body 1 until the entrainer is evenly discharged from the discharge port 14 at the bottom of the tower body 1. The preheater is controlled to transport the heated liquid product into the tower body 1 through the feed port 13. S2: After the liquid product heated by the preheater is transported into the tower body 1, the drive motor 16 is controlled to drive the reeling rod 31 to rotate in the forward direction, so that the reeling rod 31 pulls the slider 21 through the metal rope 23 to drive the cleaning rod 22 to move toward the downcomer 151. The cleaning rod 22 pushes the foam on the azeotropic agent liquid surface to the downcomer 151 through the filter cloth 225, so that the foam is squeezed and crushed by the filter cloth 225 and the air bag 19 on one side of the downcomer 151. S3: When the foam is completely broken, the hydraulic pump 17 is controlled 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 reeling rod 31 through the rectangular rod 332 in the rectangular groove 331. The drive motor 16 is controlled to drive the reeling rod 31 to rotate in the opposite direction, so that the reeling 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; S4: As the liquid product heated by the preheater is transported to the tower body 1, the gaseous product discharged from the gas outlet 11 of the tower body 1 is transported to the condenser for condensation treatment, and the liquid product at the bottom of the tower body 1 is transported to the reboiler for heating at a temperature of 70-75°C. The heated vaporized entrainer is transported to the condenser for condensation and then transported to the tower body 1 for recycling. The separated mixture of isopropyl alcohol and water is dehydrated through a dehydration tower to finally obtain the desired high-purity isopropyl alcohol.

[0036] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A purification device for high-purity isopropyl alcohol, comprising a hydrogenation reactor, a gas-liquid separator, a preheater, a plate distillation tower, a reboiler, a condenser and a dehydration tower, characterized in that: The plate-type distillation tower comprises a tower body (1); the tower body (1) is provided with an air outlet (11), a liquid inlet (12), a feed inlet (13) and a discharge outlet (14) in sequence from top to bottom; a tower tray (15) is installed in the tower body (1); a downcomer (151) is installed on one side of the tower tray (15); a sieve hole (152) is provided on the surface of the tower tray (15); a float valve (153) is slidably installed in the sieve hole (152); The lower end of the tower plate (15) is provided with two arc-shaped grooves (2) facing each other; a slider (21) is slidably connected in the arc-shaped groove (2); a cleaning rod (22) is installed at the lower end of the slider (21), and a strip groove (221) is provided on the surface of the cleaning rod (22); a cavity (222) communicating with the strip groove (221) is provided in the interior of the cleaning rod (22); a rotating rod (223) is rotatably connected in the cavity (222); the lower end of the rotating rod (223) is connected to the cleaning rod (22) through a coil spring (224); a filter cloth (225) is provided between two adjacent cleaning rods (22); the two ends of the filter cloth (225) are respectively connected to the rotating rods (223) in the two cleaning rods (22); a traction module is installed in the arc-shaped groove (2); the traction module is used to traction the slider (21) to slide in the arc-shaped groove (2).

2. The high-purity isopropyl alcohol purification device according to claim 1, characterized in that: The traction module comprises a metal rope (23); a concave cavity (3) is provided inside the tray; a reeling rod (31) is rotatably connected in the concave cavity (3); one end of the metal rope (23) is connected to the reeling 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 reeling 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 driving motor (16) is installed on one side of the tower body (1); the driving motor (16) is used to drive the bevel gear shaft (32) to rotate; a reset unit is installed in the concave cavity (3); the reset unit is used to pull the slider (21) in the arc groove (2) to reset.

3. The high-purity isopropyl alcohol purification device 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 provided 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); a slot (312) is provided 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 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 the 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).

4. The high-purity isopropyl alcohol purification device according to claim 3, characterized in that: The reset unit further comprises a winding drum (34); the winding drum (34) is rotatably connected to the surface of the winding rod (31); a tooth groove (35) is provided on the inner wall of the winding drum (34); a groove (313) is provided on the surface of the winding rod (31) and is opposite to the tooth groove (35); a 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) via a support spring (316); the slot (312) and the groove (313) are communicated via an airway (317); and the end of the metal rope (23) away from the slider (21) is connected to the winding drum (34).

5. The high-purity isopropyl alcohol purification device according to claim 4, characterized in that: 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); and the fixing rod (24) is connected to the bottom of the fixing groove (25) via a fixing spring (26).

6. The high-purity isopropyl alcohol purification device according to claim 5, characterized in that: A mounting groove (18) is provided on one side of the liquid dropper plate (151) close to the cleaning rod (22); an air bag (19) is fixedly connected in the mounting groove (18).

7. The high-purity isopropyl alcohol purification device according to claim 6, characterized in that: The side wall of the arc-shaped groove (2) is provided with an air storage groove (27) in communication with the mounting groove (18); a sealing plate (271) is slidably and sealingly connected in the air storage groove (27); and the sealing plate (271) is connected to the bottom of the air storage groove (27) via a sealing spring (272).

8. The high-purity isopropyl alcohol purification device according to claim 7, characterized in that: A magnet (181) is embedded in the bottom of the installation groove (18); a metal ball (182) is adsorbed on one side of the magnet (181); and the metal ball (182) is fixedly connected to the inner wall of the airbag (19) via an elastic rope (183).

9. A process for purifying high-purity isopropyl alcohol, the process being applicable to the high-purity isopropyl alcohol purification device of claim 8, characterized in that: The steps of the process are as follows: S1: The isopropanol-containing mixture produced by the acetone hydrogenation reaction is transported to a gas-liquid separator to separate and obtain a liquid product containing isopropanol and acetone. The liquid product is heated to 60-90°C by a preheater. At the same time, an entrainer at 60°C is transported into the tower body (1) until the entrainer is uniformly discharged from the discharge port (14) at the bottom of the tower body (1). The preheater is controlled to transport the heated liquid product into the tower body (1) through the feed port (13); S2: After the liquid phase product heated by the preheater is transported into the tower body (1), the driving motor (16) is controlled to drive the reeling rod (31) to rotate in the forward direction, so that the reeling rod (31) pulls the slider (21) through the metal rope (23) to drive the cleaning rod (22) to move toward the downcomer (151), so that the cleaning rod (22) pushes the foam on the azeotropic agent liquid surface to the downcomer (151) through the filter cloth (225), so that the foam is squeezed and crushed by the filter cloth (225) and the air bag (19) on one side of the downcomer (151); S3: When the foam is completely broken, the hydraulic pump (17) is controlled 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 reeling rod (31) through the rectangular rod (332) in the rectangular groove (331), and the driving motor (16) is controlled to drive the reeling rod (31) to rotate in the opposite direction, so that the reeling 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; S4: As the liquid phase product heated by the preheater is transported into the tower body (1), the gas phase product discharged from the gas outlet (11) of the tower body (1) is transported to the condenser for condensation treatment, and the liquid phase product at the bottom of the tower body (1) is transported to the reboiler for heating at a temperature of 70-75°C. The heated vaporized entrainer is transported to the condenser for condensation and then transported to the tower body (1) for recycling. The separated isopropyl alcohol and water mixture is dehydrated through a dehydration tower to finally obtain the desired high-purity isopropyl alcohol.

Images