Low-naphthalene aromatic solvent rectifying tower packing device

Abstract

The utility model discloses a packing device for a low-naphthalene aromatic solvent rectifying tower. The packing device comprises a fixed frame and a plurality of groups of packing plates which are sequentially arranged on the inner side wall of the fixed frame from top to bottom. According to the utility model, a gas phase gradually converges towards a wave crest along the lower wall of the wave crest of the filler plate and moves to the upper layer through the vent hole and the exhaust pipe, and a liquid phase generated when the gas phase is in contact with the filler plate converges towards the wave crest along the lower wall of the wave crest of the filler plate due to self weight and drops into the liquid discharge guide pipe of the lower layer of filler plate downwards along the outer wall of the liquid discharge guide pipe; due to the fact that the upper openings of the liquid discharging guide pipes are large and the lower openings of the liquid discharging guide pipes are small, the gas phase cannot move upwards from the liquid discharging guide pipes in the liquid discharging process, the exhaust guide pipes on every two adjacent sets of filler plates are vertically opposite, and the gas phase can smoothly move upwards from one set of exhaust guide pipes. The gas phase and liquid phase contact process is less, the reaction resistance is small, the reaction energy consumption is low, and the separation effect is good.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical distillation equipment, in particular to a filling device for a low-naphthalene aromatic solvent distillation tower. Background Art

[0002] Aromatic solvent is an important organic chemical raw material. It has the characteristics of high boiling point, strong solubility, slow volatility, low odor, no chlorine and heavy metals, low toxicity, high flash point and strong permeability. High-boiling-point aromatic solvents are mainly used in the production of low-naphthalene coatings, plastic resins, silver pastes, medicines and other industries. As environmental protection requirements become more and more stringent, the naphthalene content in low-naphthalene high-boiling-point aromatic solvents is also required to be lower and lower. For example, the prior art discloses a device for preparing low-naphthalene high-boiling-point aromatic solvents, including a multi-stage distillation device, a crystallization device and a liquid-solid separation device connected in series in sequence; the naphthalene content in the low-naphthalene high-boiling-point aromatic solvent with a carbon weight of ten produced by this technology is lower than the enterprise standard, and it is pollution-free to the environment and has good environmental performance.

[0003] The above-mentioned distillation tower needs to use packing. There are two main types of packing at present. One is regular packing: generally made of overlapping metal mesh or porous plates. When in use, according to the structural size of the packing tower, it is stacked into a cylindrical block and placed in the tower or divided into blocks and assembled into a cylindrical shape and installed in the tower; the shortcomings of the prior art are: the problem with the existing distillation tower packing device is that its reaction energy consumption is high and the separation effect is not good. For this reason, another technology on the market discloses a low naphthalene high boiling point aromatic solvent distillation tower packing device, including stacked multi-layer corrugated plates, the corrugated plates are in a broken line shape, and the crests and troughs of the corrugated plates are respectively provided with raised discs. The technical solution states that the device is arranged as a packing in a distillation tower. When the fractions are separated, the gas can gradually converge to the lower side of the wave crest along the lower surface of the corrugated plate, and then move upward through the liquid flow holes of the layer, and pass through the liquid flow holes layer by layer in sequence, and leave from the top of the distillation tower. However, it can be seen from the gas phase flow route that during the separation process, when the gas phase contacts the corrugated plate, the liquid phase contained in the gas phase adheres to the lower wall of the corrugated plate, and moves downward from the liquid flow holes after converging, and the subsequent gas phase that continuously enters the packing also rises from the liquid flow holes, and the gas phase contacts the liquid phase in the liquid flow holes, resulting in the gas phase and the liquid phase always being in the contact process, resulting in incomplete separation and very poor separation effect.

[0004] In view of the above-mentioned deficiencies in the prior art, it is necessary to improve the structure of the packing device of the low naphthalene aromatic solvent distillation tower. Utility Model Content

[0005] The utility model aims to solve the shortcomings in the prior art and proposes a low-naphthalene aromatic solvent distillation tower packing device.

[0006] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a low naphthalene aromatic hydrocarbon solvent distillation tower packing device, comprising a fixed frame and a plurality of packing plates arranged in sequence from top to bottom on the inner wall of the fixed frame, the outer wall of the fixed frame and near the upper and lower ends are fixedly connected with flanges for fixing to the inner wall of the distillation tower, the packing plate is composed of a plurality of groups of crests and troughs arranged adjacent to each other in sequence, the cross-sections of the crests and troughs are both semicircular, the top of the crest is fixedly connected with an exhaust duct for discharging the gas phase during the reaction, the upper wall of the crest is provided with an air vent, the lower wall of the trough is fixedly connected with a drainage duct for discharging the liquid phase during the reaction, and the lower wall of the trough is provided with a liquid through hole.

[0007] As a further description of the above technical solution:

[0008] The plurality of groups of filler plates are arranged in parallel, and the length directions of the wave crests of two upper and lower adjacent groups of filler plates are parallel.

[0009] As a further description of the above technical solution:

[0010] The vent hole is vertically connected with the exhaust pipe, and the liquid hole is vertically connected with the drain pipe.

[0011] As a further description of the above technical solution:

[0012] The exhaust duct is in the shape of a cone with a large upper opening and a small lower opening, and the diameter of the lower opening of the exhaust duct is consistent with the diameter of the vent hole.

[0013] As a further description of the above technical solution:

[0014] The drainage conduit is in the shape of a truncated cone with a small upper opening and a large lower opening, and the diameter of the lower opening of the drainage conduit is consistent with the diameter of the liquid through hole.

[0015] As a further description of the above technical solution:

[0016] The liquid discharge conduits on two adjacent groups of filler plates in the plurality of groups of filler plates are opposed to each other up and down, and the exhaust conduits on two adjacent groups of filler plates in the plurality of groups of filler plates are opposed to each other up and down.

[0017] The utility model has the following beneficial effects:

[0018] Compared with the prior art, the packing device for the low-naphthalene aromatic hydrocarbon solvent distillation tower has a gas phase that gradually converges toward the wave crest along the lower wall of the wave trough of the packing plate and moves to an upper layer through the vent hole and the exhaust pipe. The liquid phase generated when the gas phase contacts the packing plate converges toward the wave trough along the lower wall of the wave crest of the packing plate due to its own weight and drips downward into the discharge conduit of the next packing plate along the outer wall of the discharge conduit, passes through the packing plates layer by layer and falls into the bottom of the distillation tower. The gas phase finally leaves the top of the distillation tower. Since the upper opening of the discharge conduit is large and the lower opening is small, the gas phase cannot move upward from the discharge conduit during drainage, and the exhaust conduits on two adjacent groups of packing plates are opposite to each other up and down, so the gas phase can smoothly move upward from one group of exhaust conduits. The gas phase and the liquid phase have fewer contact processes and the reaction resistance is small, so that the reaction energy consumption is low and the separation effect is good, so that the continuity and stability of the distillation of the low-naphthalene product are good. The device can be used as a packing in a low-naphthalene aromatic hydrocarbon solvent distillation tower. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the overall structure of a packing device for a low-naphthalene aromatic solvent distillation tower proposed by the utility model;

[0020] Figure 2 A low-naphthalene aromatic solvent distillation tower packing device proposed by the utility model Figure 1 A partial enlarged view of the middle A;

[0021] Figure 3 The utility model discloses a partial structural cross-sectional view of a packing plate of a packing device for a low-naphthalene aromatic solvent distillation tower.

[0022] Legend:

[0023] 1. Fixing frame; 2. Flange; 3. Filling plate; 4. Wave crest; 5. Wave trough; 6. Air vent; 7. Liquid hole; 8. Exhaust duct; 9. Drain duct. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] Reference Figures 1 to 3The utility model provides a low-naphthalene aromatic solvent distillation tower packing device: comprising a fixing frame 1 and a plurality of packing plates 3 arranged sequentially from top to bottom on the inner side wall of the fixing frame 1, the outer wall of the fixing frame 1 and the flanges 2 for fixing to the inner side wall of the distillation tower are fixedly connected near the upper and lower ends, the packing plates 3 are composed of a plurality of wave crests 4 and wave troughs 5 arranged adjacent to each other in sequence, the plurality of packing plates 3 are arranged in parallel, and the length directions of the wave crests 4 of the two adjacent packing plates 3 are parallel, and during separation, the gas phase in the distillation tower moves from bottom to top and passes through the plurality of packing plates 3;

[0026] The cross sections of the crest 4 and the trough 5 are both semicircular, the drainage conduits 9 on two adjacent groups of packing plates 3 in the multiple groups of packing plates 3 are vertically opposed, and the exhaust conduits 8 on two adjacent groups of packing plates 3 in the multiple groups of packing plates 3 are vertically opposed. The semicircular cross section allows the gas phase to converge inside the crest 4 when it rises, and when the gas phase contacts the inner wall of the crest 4, the liquid phase contained in the gas phase is attached to the inner wall of the crest 4, and flows to the outer wall of the trough 5 along the curvature of the inner wall of the crest 4 due to its own weight;

[0027] An exhaust conduit 8 for exhausting the gas phase during the reaction is fixedly connected to the top of the peak 4, and a liquid hole 7 is arranged on the lower wall of the trough 5. The vent hole 6 and the exhaust conduit 8 are connected vertically. The exhaust conduit 8 is a cone-shaped with a large upper opening and a small lower opening. The diameter of the lower opening of the exhaust conduit 8 is consistent with the diameter of the vent hole 6. The gas phase gathered inside the peak 4 enters the exhaust conduit 8 along the vent hole 6 due to air pressure reasons, and is discharged through the exhaust conduit 8 to contact the upper layer of the packing plate 3. The setting of the exhaust conduit 8 with a large upper opening and a small lower opening allows the gas phase to contact the inner wall of the peak 4 as much as possible when it is discharged into the peak 4 of the upper layer of the packing plate 3, so that the liquid phase contained in the gas phase adheres to the inner wall of the peak 4 as much as possible, thereby improving the separation effect;

[0028] A vent hole 6 is provided on the upper wall of the crest 4, and a drainage conduit 9 for discharging the liquid phase during the reaction is fixedly connected to the lower wall of the trough 5. The drainage hole 7 is connected with the drainage conduit 9 from top to bottom. The drainage conduit 9 is a frustum with a small upper opening and a large lower opening. The diameter of the lower opening of the drainage conduit 9 is consistent with the diameter of the liquid hole 7. After the liquid phase is separated from the gas phase, it flows along the lower surface of the crest 4 to the outer wall of the trough 5, and flows to the outer wall of the drainage conduit 9, drips downward along the outer wall of the drainage conduit 9, and falls into the drainage conduit 9 in the next layer of packing plates 3, passes through multiple groups of packing plates 3 in sequence, and then falls into the bottom of the distillation tower. The setting of the drainage conduit 9 with a large upper opening and a small lower opening ensures that the gas phase will not pass through the drainage conduit 9 when the liquid phase converges and flows downward, reducing the contact opportunity between the newly entered gas phase and the original separated liquid phase, thereby greatly improving the separation effect.

[0029] Working principle:

[0030] During separation, the gas phase in the distillation tower moves from bottom to top, passing through multiple groups of packing plates 3. The semicircular cross-section allows the gas phase to gather inside the crest 4 when it rises. When the gas phase contacts the inner wall of the crest 4, the liquid phase contained in the gas phase is attached to the inner wall of the crest 4, and flows to the outer wall of the trough 5 along the curvature of the inner wall of the crest 4 due to its own weight. The gas phase gathered inside the crest 4 enters the exhaust duct 8 along the vent 6 due to air pressure, and is discharged through the exhaust duct 8 to contact the upper layer of packing plates 3. The exhaust duct 8 is set with a large upper opening and a small lower opening so that the gas phase can contact as much as possible when it is discharged to the crest 4 of the upper layer of packing plates 3. The inner wall of the peak 4 contacts the inner wall of the peak 4, so that the liquid phase contained in the gas phase adheres to the inner wall of the peak 4 as much as possible, thereby improving the separation effect. After the liquid phase is separated from the gas phase, it flows along the lower surface of the peak 4 to the outer wall of the trough 5, and flows to the outer wall of the drainage conduit 9, drips downward along the outer wall of the drainage conduit 9, and falls into the drainage conduit 9 in the next layer of packing plates 3, passes through multiple groups of packing plates 3 in sequence, and then falls into the bottom of the distillation tower. The setting of the drainage conduit 9 with a large upper opening and a small lower opening ensures that the gas phase will not pass through the drainage conduit 9 when the liquid phase converges and flows downward, reducing the contact opportunity between the newly entered gas phase and the original separated liquid phase, thereby greatly improving the separation effect.

[0031] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A packing device for a low-naphthalene aromatic solvent distillation tower, comprising a fixed frame (1) and a plurality of packing plates (3) arranged sequentially from top to bottom on the inner side wall of the fixed frame (1), characterized in that: The outer wall of the fixed frame (1) and near both upper and lower ends are fixedly connected with flanges (2) for fixing to the inner wall of the distillation tower. The packing plate (3) is composed of a plurality of groups of wave crests (4) and wave troughs (5) arranged adjacent to each other in sequence. The cross-sections of the wave crests (4) and wave troughs (5) are both semicircular. The top of the wave crest (4) is fixedly connected with an exhaust pipe (8) for discharging the gas phase during the reaction. The upper wall of the wave crest (4) is provided with an air vent (6). The lower wall of the wave trough (5) is fixedly connected with a liquid discharge pipe (9) for discharging the liquid phase during the reaction. The lower wall of the wave trough (5) is provided with a liquid through hole (7).

2. A low-naphthalene aromatic solvent distillation tower packing device according to claim 1, characterized in that: The plurality of groups of filler plates (3) are arranged in parallel, and the length directions of the wave crests (4) of two upper and lower adjacent groups of filler plates (3) are parallel.

3. A low-naphthalene aromatic solvent distillation tower packing device according to claim 1, characterized in that: The vent hole (6) is vertically connected to the exhaust pipe (8), and the liquid hole (7) is vertically connected to the liquid discharge pipe (9).

4. A low-naphthalene aromatic solvent distillation tower packing device according to claim 3, characterized in that: The exhaust duct (8) is in the shape of a cone with a larger upper opening and a smaller lower opening, and the diameter of the lower opening of the exhaust duct (8) is consistent with the diameter of the vent hole (6).

5. A low-naphthalene aromatic solvent distillation tower packing device according to claim 4, characterized in that: The drainage conduit (9) is in the shape of a frustum with a small upper opening and a large lower opening, and the diameter of the lower opening of the drainage conduit (9) is consistent with the diameter of the liquid through hole (7).

6. A low-naphthalene aromatic solvent distillation tower packing device according to claim 5, characterized in that: The liquid discharge ducts (9) on two adjacent groups of packing plates (3) in the plurality of groups of packing plates (3) are opposed to each other in an up-and-down manner, and the exhaust ducts (8) on two adjacent groups of packing plates (3) in the plurality of groups of packing plates (3) are opposed to each other in an up-and-down manner.

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