An esterification system alcohol-water separation tower

Abstract

This invention discloses an alcohol-water separation tower for an esterification system, belonging to the technical field of alcohol-water separation towers. It includes a separation tower with an exhaust pipe at the top, a rain plate with rain holes inside, a feed pipe, a crushing mechanism fixed at the bottom, a rotating mechanism on the crushing mechanism, a floating mechanism on the outside of the rotating mechanism, a slide rail on the inner wall of the separation tower, one end of the floating mechanism slidably positioned within the slide rail, and an air inlet pipe penetrating the separation tower with a beveled bottom. A connecting pipe is movably connected to the air inlet pipe. This invention, through automatic control of the contact distance between air and mixed steam, not only ensures efficient heat exchange between air and mixed steam and timely separation of water vapor from ethylene glycol vapor in the mixed steam, but also avoids excessive evaporation of water in the aqueous solution, preventing excessive reduction in water content and avoiding additional power consumption, thus reducing the economic burden on enterprises.

Description

Technical Field

[0001] This invention relates to the field of alcohol-water separation tower technology, specifically to an alcohol-water separation tower for an esterification system. Background Technology

[0002] In the esterification system, the polyester reaction is a crucial process in the production of polyester resin. After esterification, an aqueous solution of polyester resin, water, and ethylene glycol, along with some ethylene glycol vapor and water vapor, is produced. To reduce the water content of the aqueous solution, a separation tower is needed to separate the water vapor from the mixed vapor. Therefore, based on the different boiling points of ethylene glycol and water (ethylene glycol boiling point 197.3℃, water boiling point 100℃), the temperature of the mixed vapor is lowered to between 100-197.3℃. This cools the ethylene glycol vapor to a liquid state, mixing it with the aqueous solution, while the water vapor remains in a vapor state and separates from the mixed vapor. When the aqueous solution and mixed vapor enter the separation tower, the aqueous solution falls through a rain shower and exchanges heat with the filtered natural air, cooling both the aqueous solution and the mixed vapor. The cooled ethylene glycol becomes liquid and mixes with the aqueous solution, falling into the separation tower, while the water vapor is discharged from the separation tower. Simultaneously, a feed pump removes the water solution from the separation tower. Liquid is extracted, but due to the cooling of the aqueous solution, the polyester resin in the solution is prone to clumping. When the polyester resin in the aqueous solution clumps to a certain extent in the separation tower, the pumping becomes less smooth, the pumping flow rate decreases, and the liquid level in the separation tower gradually rises. This reduces the contact distance between the air and the rain-soaked aqueous solution and the mixed steam, thus reducing the heat exchange effect between the air and the mixed steam and decreasing the water vapor separation efficiency in the mixed steam. Existing technology installs a motor at the bottom of the separation tower and a crushing head inside the tower. The motor drives the crushing head to rotate, causing it to crush the clumped components in the aqueous solution. However, the motor drives the crushing head to rotate continuously, keeping the aqueous solution in a turbulent state. This increases the evaporation of water in the aqueous solution, resulting in an excessively low water content, which affects the production of subsequent processes. Furthermore, the separation tower is large in size, and the motor consumes a lot of electricity, increasing the economic burden on enterprises. Summary of the Invention

[0003] To address the technical problems mentioned in the background section, the present invention provides an alcohol-water separation tower for an esterification system, employing the following technical solution:

[0004] The system includes a separation tower, an exhaust pipe at the top, a rain shower plate with rain shower holes inside, a feed pipe at the top, a discharge pipe at the bottom with a pump on it, and a pneumatic device located below the rain shower plate inside the tower. The pneumatic device includes a crushing mechanism, a rotating mechanism, and a floating mechanism. The crushing mechanism is fixed to the bottom of the tower, and the rotating mechanism is mounted on it. The floating mechanism is located outside the rotating mechanism. A slide rail is located on the inner wall of the tower, with a closed upper and lower section. One end of the floating mechanism is slidably mounted within the slide rail, and a connecting pipe is located at the tangential point of the floating mechanism. The upper part of the connecting pipe is obliquely cut. An air inlet pipe runs through the tower, with an obliquely cut bottom. The connecting pipe is movably connected to the air inlet pipe.

[0005] Furthermore, the crushing mechanism includes a sealed bearing fixed to the bottom of the separation tower, a rotating shaft mounted on the sealed bearing, a cutter head mounted on the rotating shaft, and blades mounted on the cutter head.

[0006] Furthermore, the rotating mechanism includes a rotating rod fixed to the cutter head, on which an impeller is mounted.

[0007] Furthermore, the floating mechanism includes a sleeve disposed outside the rotating rod and the impeller, a connecting pipe disposed at the tangential part of the sleeve, a sliding plate disposed on the sleeve, one end of the sliding plate being slidably disposed in the slide rail, an air outlet disposed at the upper part of the sleeve, and a floating component disposed at the bottom of the sleeve.

[0008] Furthermore, the air outlet includes an air outlet mounted on the sleeve, a sealing cap hinged to the air outlet, and an L-shaped limiting block mounted on the hinge point.

[0009] Furthermore, the floating component includes a slot fixed to the sleeve, into which a float is inserted.

[0010] Furthermore, the pontoon and the slot were secured with bolts, which ran through both the pontoon and the slot.

[0011] This invention has the following advantages: When the amount of agglomerates in the aqueous solution inside the separation tower gradually increases, the bottom of the separation tower becomes congested, the flow rate of the aqueous solution pump decreases, the amount of aqueous solution inside the separation tower gradually increases, and the liquid level gradually rises. The floating mechanism floats up with the rise in liquid level. When the connecting pipe on the floating mechanism is connected to the air inlet pipe, a sealed connection is formed with the air inlet pipe. At the same time, the connecting pipe is limited by the air inlet pipe, preventing the connecting pipe from moving upward. The connecting pipe also restricts the floating mechanism from moving upward. The connecting pipe is tangentially aligned with the rotating mechanism inside the floating mechanism. At this time, the air in the air inlet pipe is blown towards the rotating mechanism through the connecting pipe. The rotating mechanism rotates, and the rotating mechanism drives the crushing mechanism to rotate. The agglomerated portion of the aqueous solution in the separation tower is crushed, allowing the feed pump to resume unobstructed flow. The aqueous solution level then drops, and the floating mechanism descends with the liquid level, separating the connecting pipe from the air inlet pipe. The air exiting the air inlet pipe then re-establishes a set contact distance with the mixed steam entering the feed pipe. This invention, through automatic control of the contact distance between air and mixed steam, not only ensures efficient heat exchange between the air and mixed steam and timely separation of water vapor and ethylene glycol vapor in the mixed steam, but also avoids excessive evaporation of water in the aqueous solution, preventing excessive reduction in water content. Furthermore, it avoids the need for additional power supply, thus reducing the economic burden on the enterprise. Attached Figure Description

[0012] Figure 1 This is a structural diagram of the pneumatic device of the present invention when it is not started;

[0013] Figure 2 For the present invention Figure 1 A magnified view of a portion of point a;

[0014] Figure 3 For the present invention Figure 1 A magnified view of a section at point b in the middle;

[0015] Figure 4 For the present invention Figure 1 A magnified view of a section at point c in the middle;

[0016] Figure 5 This is a top view of the rain shower plate of the present invention;

[0017] Figure 6 This is a top view of the pneumatic device of the present invention;

[0018] Figure 7 For the present invention Figure 6 A magnified view of a portion at point d in the middle;

[0019] Figure 8 For the present invention Figure 6 A magnified view of a section at point e in the middle;

[0020] Figure 9 This is a structural diagram of the pneumatic device of the present invention during startup;

[0021] Figure 10 For the present invention Figure 9 A magnified view of a portion at point f.

[0022] Attached diagram: 1 Separation tower, 2 Exhaust pipe, 3 Rain shower plate, 4 Rain shower hole, 5 Feed pipe, 6 Discharge pipe, 7 Feed pump, 8 Slide rail, 9 Connecting pipe, 10 Air inlet pipe, 11 Sealed bearing, 12 Rotary shaft, 13 Cutter head, 14 Blade, 15 Rotary rod, 16 Impeller, 17 Sleeve, 18 Slide plate, 19 Slot, 20 Float, 21 Bolt, 22 Air outlet, 23 Sealing cover, 24 L-shaped limit block. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] This invention provides an alcohol-water separation tower for an esterification system, comprising a separation tower 1, an exhaust pipe 2 at the top of the separation tower 1 through which water vapor is discharged, a rain shower plate 3 inside the separation tower 1 with rain shower holes 4, a feed pipe 5 on the separation tower 1 through which aqueous solution and mixed steam enter the separation tower 1, and the aqueous solution falls onto the rain shower plate 3 and falls through the rain shower holes 4 in a rain shower manner, a discharge pipe 6 at the bottom of the separation tower 1 with a feed pump 7 installed on the discharge pipe 6, through which the aqueous solution in the separation tower 1 is drawn out by the feed pump 7, and a pneumatic device is installed inside the separation tower 1 below the rain shower plate 3, the pneumatic device including a crushing mechanism, a rotating mechanism and a floating mechanism, the crushing mechanism being fixed to the bottom of the separation tower. The crushing mechanism is equipped with a rotating mechanism, and a floating mechanism is provided on the outside of the rotating mechanism. The inner wall of the separation tower 1 is provided with a slide 8, the upper and lower parts of which are closed structures. One end of the floating mechanism is slidably disposed in the slide 8, so that the floating mechanism is restricted when it slides up and down in the slide 8 to the highest and lowest points. A connecting pipe 9 is provided at the tangential part of the floating mechanism. The upper part of the connecting pipe 9 is obliquely cut. An air inlet pipe 10 passes through the separation tower 1. The bottom of the air inlet pipe 10 is obliquely cut. The connecting pipe 9 is movably connected to the air inlet pipe 10. The oblique cut of the upper part of the connecting pipe 9 and the oblique cut of the bottom of the air inlet pipe 10 allow the connecting pipe 9 to connect with the air inlet pipe 10 when it moves upward. The air inlet pipe 10 restricts the upper part of the connecting pipe 9.

[0025] The pulverizing mechanism includes a sealed bearing 11 fixed to the bottom of the separation tower 1. A rotating shaft 12 is mounted on the sealed bearing 11. A cutter head 13 is mounted on the rotating shaft 12. A blade 14 is mounted on the cutter head 13. When the cutter head 13 rotates, it drives the blade 14 to rotate. The blade 14 pulverizes the agglomerated part in the aqueous solution. At the same time, the cutter head 13 drives the rotating shaft 12 to rotate within the sealed bearing 11. The rotating mechanism includes a rotating rod 15 fixed on the cutter head 13. An impeller 16 is mounted on the rotating rod 15. When the impeller 16 rotates, it drives the rotating rod 15 to rotate. The rotating rod 15 drives the cutter head 13 to rotate 5.

[0026] The floating mechanism includes a sleeve 17 disposed outside the rotating rod 15 and the impeller 16. The rotating rod 15 and the impeller 16 are disposed at the center of the inner side of the sleeve 17. A connecting pipe 9 is disposed tangentially at the sleeve 17. When air passes through the tangentially disposed connecting pipe 9, the air blows one side of the impeller 16, causing the impeller 16 to rotate. A sliding plate 18 is disposed on the sleeve 17. One end of the sliding plate 18 is slidably disposed in the slide rail 8. The sliding plate 18 is limited by the highest and lowest points of the slide rail 8. An air outlet is disposed at the upper part of the sleeve 17, and a floating mechanism is disposed at the bottom of the sleeve 17. The air outlet component includes an air outlet 22 provided on the sleeve 17, a sealing cover 23 hinged to the air outlet 22, and an L-shaped limiting block 24 provided at the hinge point. When the connecting pipe 9 is connected to the air inlet pipe 10 and air enters the sleeve 17, the air pushes open the hinged sealing cover 23 and the air goes out upward through the air outlet 22. The floating component includes a slot 19 fixed on the sleeve 17, a float 20 inserted into the slot 19, and a bolt 21 fixed between the float 20 and the slot 19. The bolt 21 passes through the float 20 and the slot 19.

[0027] Working principle of the invention:

[0028] Please refer to Figure 1-8 The aqueous solution and mixed steam generated by the polyester reaction enter the separation tower 1 through the feed pipe 5. The aqueous solution falls onto the rain plate 3 and falls through the rain holes 4 in the form of rain. The purified air enters the separation tower 1 through the air inlet pipe 10 and comes into heat exchange contact with the rained aqueous solution and mixed steam, which cools the aqueous solution and mixed steam. At the same time, the aqueous solution in the separation tower 1 is pumped out through the discharge pipe 6 by the feed pump 7, so that the liquid level of the aqueous solution in the separation tower 1 is always maintained at a certain position. At this time, the air in the separation tower 1 is always kept at a certain distance from the mixed steam above the liquid surface of the aqueous solution. The air comes into contact with the ethylene glycol vapor and water vapor in the mixed steam, which cools the ethylene glycol vapor and water vapor. The ethylene glycol vapor is cooled to a temperature below its boiling point and becomes liquid and falls into the aqueous solution. The cooled water vapor is at a moderate temperature above the boiling point of water and still exists in the form of steam, and is discharged with the air through the exhaust pipe 2.

[0029] Please refer to Figure 9-10As the aqueous solution cools upon contact with air, agglomerated components gradually form within it, causing blockage in separation tower 1. This obstructs the flow of the feed pump 7, reducing the volume of water drawn and decreasing the amount extracted per unit time. Consequently, the volume of aqueous solution in separation tower 1 gradually increases, raising the liquid level. This rise in the liquid level causes the float 20 to ascend, which in turn causes the sleeve 17 and connecting pipe 9 to ascend. Simultaneously, the sliding plate 18 slides upward within the slide rail 8. The sliding plate 18's controlled movement within the slide rail 8 ensures a stable ascent of the sleeve 17 without deviation. When the inclined surface of the upper part of the connecting pipe 9 meets the air inlet... When the beveled ends of the bottom of pipe 10 are aligned, the connecting pipe 9 and the air inlet pipe 10 form a sealed connection. At the same time, the air inlet pipe 10 limits the upper part of the connecting pipe 9, preventing it from rising further. The float 20 and the sleeve 17 also cannot rise further. At this time, the connecting pipe 9 is tangentially aligned with the impeller 16, and air enters the connecting pipe 9 through the air inlet pipe 10. The air in the connecting pipe 9 blows tangentially towards the impeller 16, causing the impeller 16 to rotate. The impeller 16 drives the rotating rod 15, the cutter head 13, the blade 14, and the rotating shaft 12 to rotate on the sealed bearing 11. The blade 14 removes the agglomerated parts in the aqueous solution. The crushing process allows the pump 7 to pump the aqueous solution smoothly again. During this process, the air inside the sleeve 17 can only push against the sealing cover 23, causing the hinged sealing cover 23 to open. The air then exits upward through the air outlet 22. The sealing cover 23 is resisted by the L-shaped limiting block 24 and can only open to a certain angle. Although the rising liquid level shortens the contact distance between the air and the mixed steam, the air can still contact the mixed steam to achieve heat exchange, although the heat exchange effect is not very good and the water vapor separation efficiency is not high. However, this process lasts for a very short time. As the agglomerated parts of the aqueous solution are crushed, the material... Pump 7 can quickly pump out the aqueous solution again, and the water level drops again. As the water level drops, float 20, sleeve 17 and connecting pipe 9 also drop. Connecting pipe 9 and air inlet pipe 10 separate. At this time, sealing cover 23 loses the upward push of air flow and seals 23 closes again under the action of gravity. Sealing cover 23 covers air outlet 22 to prevent aqueous solution from falling into sleeve 17 when passing through deluge hole 4, causing stagnation in sleeve 17. When sealing cover 23 is opened by air flow, high-pressure airflow simultaneously pushes open the deluge water, and the aqueous solution cannot enter sleeve 17.

[0030] This invention is simple to operate, convenient to use, and suitable for widespread promotion and application. Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An esterification system alcohol-water separation tower, comprising a separation tower (1), an exhaust pipe (2) provided at the top of the separation tower (1), a rain plate (3) provided inside the separation tower (1), rain holes (4) provided on the rain plate (3), a feed pipe (5) provided on the separation tower (1), a discharge pipe (6) provided at the bottom of the separation tower (1), and a feed pump (7) provided on the discharge pipe (6), characterized in that, A pneumatic device is installed inside the separation tower (1) on the lower side of the rain plate (3). The pneumatic device includes a crushing mechanism, a rotating mechanism and a floating mechanism. The crushing mechanism is fixed at the bottom of the separation tower. A rotating mechanism is installed on the crushing mechanism. A floating mechanism is installed on the outside of the rotating mechanism. A slide (8) is installed on the inner wall of the separation tower (1). The upper and lower parts of the slide (8) are closed structures. One end of the floating mechanism is slidably installed in the slide (8). A connecting pipe (9) is installed at the tangential part of the floating mechanism. The upper part of the connecting pipe (9) is obliquely cut. An air inlet pipe (10) runs through the separation tower (1). The bottom of the air inlet pipe (10) is obliquely cut. The connecting pipe (9) is movably connected to the air inlet pipe (10). Air in the intake pipe (10) is blown to the rotating mechanism through the connecting pipe (9), and the rotating mechanism rotates, which in turn drives the crushing mechanism to rotate.

2. The alcohol-water separation tower for an esterification system according to claim 1, characterized in that, The crushing mechanism includes a sealed bearing (11) fixed at the bottom of the separation tower (1), a rotating shaft (12) is provided on the sealed bearing (11), a cutter head (13) is provided on the rotating shaft (12), and a blade (14) is provided on the cutter head (13).

3. The alcohol-water separation tower for an esterification system according to claim 2, characterized in that, The rotating mechanism includes a rotating rod (15) fixed on the cutter head (13), and an impeller (16) is provided on the rotating rod (15).

4. The alcohol-water separation tower for an esterification system according to claim 1, characterized in that, The floating mechanism includes a sleeve (17) disposed outside the rotating rod (15) and the impeller (16), a connecting pipe (9) disposed at the tangential part of the sleeve (17), a sliding plate (18) disposed on the sleeve (17), one end of the sliding plate (18) being slidably disposed in the slide (8), an air outlet disposed at the upper part of the sleeve (17), and a floating component disposed at the bottom of the sleeve (17).

5. The alcohol-water separation tower for an esterification system according to claim 4, characterized in that, The air outlet includes an air outlet (22) provided on the sleeve (17), a sealing cap (23) is hinged on the air outlet (22), and an L-shaped limit block (24) is provided at the hinge point.

6. The alcohol-water separation tower for an esterification system according to claim 4, characterized in that, The floating component includes a slot (19) fixed on the sleeve (17), and a float (20) is inserted into the slot (19).

7. The alcohol-water separation tower for an esterification system according to claim 6, characterized in that, The pontoon (20) and the slot (19) were fixed by bolts (21), which passed through the pontoon (20) and the slot (19).

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