Tower equipment for recovering phenol in bisphenol A by-product

Abstract

The utility model provides tower equipment for recovering phenol in bisphenol A by-products, in the tower equipment for recovering phenol in bisphenol A by-products, a polyphenol material enters a filler after being uniformly distributed by a groove type liquid distributor, and because the temperatures of all layers in the filler are different, and the boiling points of phenol and other impurities are different, the phenol content in the filler is reduced; therefore, separation of phenol from other impurities is realized, and phenol recovery is realized. In addition, the content of recycled phenol can be further increased through multiple times of backflow of materials at the tower bottom and the tower top, the content of phenol in polyphenol materials introduced into the incineration unit can be reduced to 5%, raw material consumption of the system is effectively reduced, the production cost is reduced, and economic benefits are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of chemical equipment and relates to a tower type equipment for recovering phenol in bisphenol A by-product. Background Art

[0002] Bisphenol A, also known as BPA, is an organic compound mainly used in the production of polycarbonate, epoxy resin, polysulfone resin, etc. It is one of the most widely used industrial compounds.

[0003] The production process of bisphenol A is usually to mix phenol and acetone, add sulfuric acid as a catalyst, and react at a certain temperature and pressure to generate bisphenol A and byproduct water. In the production process of bisphenol A, the bisphenol A char from the bottom of the tower equipment that recovers phenol from the byproduct of bisphenol A goes to the char cracking reactor. Under the action of the catalyst, some heavy impurities are decomposed into phenol again. This part of phenol returns to the tower equipment that recovers phenol from the byproduct of bisphenol A and enters the combustion furnace with the remaining heavy residues such as polyphenols for combustion, and the phenol content in the polyphenols reaches 23%. As the raw material of bisphenol A products, phenol enters the incinerator together with polyphenols, which invisibly increases the operating costs of the enterprise and is not conducive to the green development of the enterprise. Utility Model Content

[0004] The utility model aims to provide a tower type equipment for recovering phenol in bisphenol A byproduct, so as to solve the problem of phenol resource waste in the bisphenol A production process.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] The utility model provides a tower type equipment for recovering phenol in bisphenol A byproduct, comprising an upper head and a tower body connected to each other, wherein a raw material feed port and a tower bottom material reflux port are sequentially arranged on the side wall of the tower body from top to bottom, and a discharge port is arranged at the bottom of the tower body; a gas outlet and a tower top material reflux port are respectively arranged on the top and side wall of the upper head; and a trough type liquid distributor and filler are sequentially arranged below the raw material feed port and the tower top material reflux port.

[0007] Preferably, the trough-type liquid distributor comprises two supporting columns arranged on the inner wall of the tower body, baffles are respectively provided on the tops of the two supporting columns, and two liquid collecting plates are provided between the two baffles; the angle between the two liquid collecting plates is 60°, and the liquid collecting plates and the baffles are arranged in parallel; a collecting trough is provided between the two supporting columns, and a plurality of tear holes are provided at the bottom of the collecting trough.

[0008] Preferably, the tear hole has a diameter of 1.5 mm.

[0009] Preferably, a blocking plate is provided at the contact point between the support column and the inner wall of the tower body.

[0010] Preferably, a packing sealing ring is provided between the packing and the trough-type liquid distributor.

[0011] Preferably, a filler support and a redistribution ring are provided at the bottom of the filler, and the filler support is located between the filler and the redistribution ring.

[0012] Preferably, a thermocouple is provided in the middle of the filler.

[0013] Preferably, the packing height is 4200 mm.

[0014] The utility model has the following beneficial effects:

[0015] The utility model provides a tower type equipment for recovering phenol in bisphenol A byproducts. In the tower type equipment for recovering phenol in bisphenol A byproducts, polyphenol materials are evenly distributed through a trough type liquid distributor and then enter the filler. Since the temperatures of the various layers in the filler are different and the boiling points of phenol and other impurities are different, the phenol and other impurities are separated and the phenol is recovered. In addition, through multiple refluxes of the materials at the bottom and top of the tower, the recovered phenol content can be further increased, so that the phenol content in the polyphenol materials passed into the incineration unit can be reduced to 5%, effectively reducing the system raw material consumption, reducing the production cost, and improving the economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of the structure of a tower device for recovering phenol from bisphenol A by-products provided in an embodiment of the present application;

[0017] Figure 2 A schematic diagram of the structure of a trough-type liquid distributor provided in an embodiment of the present application;

[0018] Figure 3 Provided in the embodiments of this application Figure 2 Cross-sectional view at AA in the middle;

[0019] Symbols represent:

[0020] 1-upper head, 2-tower body, 3-raw material feed port, 4-bottom material reflux port, 5-trough type liquid distributor, 6-filler, 7-discharge port, 8-top material reflux port, 9-gas outlet, 10-filler sealing ring, 11-filler support, 12-redistribution ring;

[0021] 501-support column, 502-baffle, 503-liquid collecting plate, 504-collecting tank, 505-tear hole, 506-blocking plate, 507-pillar. DETAILED DESCRIPTION

[0022] 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.

[0023] Please refer to the attached Figure 1 , attached Figure 1 The schematic diagram of the structure of the tower equipment for recovering phenol from bisphenol A byproduct provided in the embodiment of the present application is shown. Figure 1 It can be seen that the tower equipment for recovering phenol in bisphenol A by-product in the embodiment of the present application includes an upper head 1 and a tower body 2 connected to each other, and the upper head 1 is located at the top of the tower body 2.

[0024] The side wall of the tower body 2 is provided with a raw material feed port 3 and a bottom material reflux port 4 in order from top to bottom, and a discharge port 7 is provided at the bottom of the tower body 2. The top and side wall of the upper head 1 are provided with an air outlet 9 and a top material reflux port 8, respectively. Among them, the raw material feed port 3 is used for the polyphenol material containing phenol to enter the tower body 2. The bottom material reflux port 4 is used for the material generated at the bottom of the tower to reflux into the tower body 2. The discharge port 7 is used to discharge the polyphenol material containing a small amount of phenol. The air outlet 9 is used to discharge the high-temperature steam generated by the high-temperature evaporation at the top during the reaction.

[0025] In the embodiment of the present application, the temperature at the top of the tower is 55-60°C, and the temperature at the bottom of the tower is 178-180°C. The polyphenol material enters the tower body 2 from the raw material feed port 3 located in the middle of the tower body 2. The minimum reflux ratio is set by using the different boiling points of phenol and other impurities. The polyphenol material containing a small amount of phenol is obtained at the bottom of the tower and discharged from the discharge port 7; the high-temperature steam containing phenol is obtained at the top of the tower and discharged from the gas outlet 9 to achieve the separation of phenol and the material, and finally realize the recovery of phenol. A part of the polyphenol material containing a small amount of phenol discharged from the discharge port 7 is reboiled in the reboiler and then re-recovered through the bottom material reflux port 4, and the other part is sent to the incineration unit for incineration. The high-temperature steam discharged from the gas outlet 9 is condensed by the condenser and refluxed into the tower body 2 through the top material reflux port 8 for recycling. The high-temperature steam discharged from the gas outlet 9 can prevent impurities from entering the subsequent system with the gas phase through the condenser.

[0026] In the embodiment of the present application, a packing seal ring 10 is provided between the packing 6 and the trough liquid distributor 5 to prevent the material from flowing through the wall and uneven distribution. In addition, a packing support 11 and a redistribution ring 12 are provided at the bottom of the packing 6, and the packing support 11 is located between the packing 6 and the redistribution ring 12. The packing support 11 is used to support the packing 6, and the redistribution ring 12 is used to make the polyphenol material passing through the packing 6 evenly distributed again.

[0027] Furthermore, a thermocouple is provided in the middle of the packing 6 in the embodiment of the present application to monitor the temperature of the packing 6 at different heights, so as to facilitate the automatic temperature control system to automatically control the temperature. Furthermore, the height of the packing 6 is 4200 mm, which is a BX500 structured packing.

[0028] In the embodiment of the present application, each component is connected into a whole by welding, and after welding, the surface of each component should be on the same horizontal plane, and the horizontal deviation is ≤3mm. In addition, the height of the weld angle of all tower welds and fillet welds is equal to the thickness of the thinner part, and it is a continuous weld.

[0029] A trough-type liquid distributor 5 and a packing 6 are sequentially arranged below the raw material feed port 3 and the tower top material reflux port 8. In the embodiment of the present application, the trough-type liquid distributor 5 comprises two support columns 501 arranged on the inner wall of the tower body 2, and baffles 502 are respectively arranged on the tops of the two support columns 501, and two liquid collecting plates 503 are arranged between the two baffles 502. The baffles 502 and the liquid collecting plates 503 are arranged in parallel, and the angle between the two liquid collecting plates 503 is 60°. Figure 2 , 3 The liquid collecting plate 503 is arranged on the baffle plate 502 through the support 507 to fix the liquid collecting plate 503 .

[0030] The baffle 502 and the liquid collecting plate 503 are used to receive the polyphenol material entering the tower body 2 from the raw material feed port 3. A collecting tank 504 is provided between the two support columns 501, and the polyphenol material enters the collecting tank 504 from between the baffle 502 and the liquid collecting plate 503.

[0031] In the embodiment of the present application, a plurality of tear holes 505 are provided at the bottom of the collecting tank 504, and the arrangement of the tear holes 505 can facilitate the uniform distribution of the material, and then facilitate the entry into the filler 6. Preferably, the tear hole 505 has a diameter of 1.5 mm, with an error of ±0.05 mm. The tear holes 505 in the embodiment of the present application are in the form of punching holes, and the punching direction is the direction of liquid flow. In addition, a blocking plate 506 is provided at the contact point between the support column 501 and the inner wall of the tower body 2 to prevent the polyphenol material from flowing into the filler 6 from between the baffle 502 and the inner wall of the tower body 2.

[0032] In the embodiment of the present application, the polyphenol material is evenly distributed through the trough liquid distributor 5 and then enters the filler 6. Since the temperature of each layer in the filler 6 is different and the boiling points of phenol and other impurities are different, the phenol and other impurities are separated and the phenol is recovered. In addition, through multiple reflux of the bottom and top materials, the recovered phenol content can be further increased, so that the phenol content in the polyphenol material passed into the incineration unit can be reduced to 5%, effectively reducing the system raw material consumption, reducing production costs, and improving economic benefits.

[0033] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A tower device for recovering phenol from bisphenol A by-product, characterized in that: The tower body (2) comprises an upper end cap (1) and a tower body (2) connected to each other; a raw material feed port (3) and a tower bottom material reflux port (4) are sequentially arranged on the side wall of the tower body (2) from top to bottom; and a discharge port (7) is arranged at the bottom of the tower body (2); a gas outlet (9) and a tower top material reflux port (8) are respectively arranged on the top and side wall of the upper end cap (1); and a trough-type liquid distributor (5) and a filler (6) are sequentially arranged below the raw material feed port (3) and the tower top material reflux port (8).

2. The tower equipment for recovering phenol from bisphenol A byproduct according to claim 1, characterized in that: The trough-type liquid distributor (5) comprises two support columns (501) arranged on the inner wall of the tower body (2); baffles (502) are respectively arranged on the tops of the two support columns (501); two liquid collecting plates (503) are arranged between the two baffles (502); the angle between the two liquid collecting plates (503) is 60°, and the liquid collecting plates (503) and the baffles (502) are arranged in parallel; a collecting trough (504) is arranged between the two support columns (501); a plurality of tear holes (505) are arranged at the bottom of the collecting trough (504).

3. The tower equipment for recovering phenol from bisphenol A byproduct according to claim 2, characterized in that: The tear hole (505) has a diameter of 1.5 mm.

4. The tower equipment for recovering phenol from bisphenol A byproduct according to claim 2, characterized in that: A blocking plate (506) is provided at the contact point between the support column (501) and the inner wall of the tower body (2).

5. The tower equipment for recovering phenol from bisphenol A byproduct according to claim 1, characterized in that: A packing sealing ring (10) is provided between the packing (6) and the trough-type liquid distributor (5).

6. The tower equipment for recovering phenol from bisphenol A byproduct according to claim 1, characterized in that: A filler support (11) and a redistribution ring (12) are provided at the bottom of the filler (6), and the filler support (11) is located between the filler (6) and the redistribution ring (12).

7. The tower equipment for recovering phenol from bisphenol A byproduct according to claim 1, characterized in that: A thermocouple is provided in the middle of the filler (6).

8. The tower equipment for recovering phenol from bisphenol A byproduct according to claim 1, characterized in that: The height of the filler (6) is 4200 mm.

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