A high-efficiency water washing tower for purifying bisphenol A

Abstract

The utility model discloses a high -efficient purification of bisphenol A's water washing tower, including water washing tower body, water washing tower condenser and water washing tower heat exchanger, water washing tower condenser is connected with water washing tower body, water washing tower heat exchanger is connected with water washing tower body, is equipped with one -way check valve between water washing tower condenser, water washing tower and water washing tower heat exchanger, water washing tower condenser and water washing tower heat exchanger, has the technical features such as simple structure, practicality is strong, on the structure can be convenient to realize the reduction degradation of colored bisphenol A oxidation by -product, obtains BPA product with high purity and standard colority.

Description

Technical Field

[0001] This utility model relates to a water washing tower, and more specifically, to a water washing tower for high-efficiency purification of bisphenol A, belonging to the technical field of water washing tower equipment. Background Technology

[0002] Bisphenol A (BPA, C) 15 H 16 O2 (benzene oxide) is one of the most widely used industrial compounds in the world. Due to the easy oxidation of the phenolic hydroxyl groups in its benzene ring structure, it possesses potential environmental mobility and chemical reactivity. BPA, as a major product of polycarbonate and epoxy resin depolymerization, exhibits weak acidity, hydrophobicity, and photosensitivity. Under oxidizing conditions such as light exposure and ozone treatment, it readily generates colored oxidation byproducts such as quinone derivatives through electron transfer mechanisms. These byproducts not only exhibit significant visible light absorption but also possess stronger bioaccumulation and genotoxicity due to the expansion of their conjugated structures, potentially reducing the purity of depolymerization products and exacerbating ecological risks.

[0003] Existing water washing tower technologies are mostly based on coordination precipitation or ion exchange principles, focusing on removing metal ions such as Cu²⁺ and Fe³ that catalyze the oxidation of BPA, for example, using EDTA-functionalized resins to achieve high metal rejection rates. However, system designs generally neglect the need for reduction and conversion of oxidation byproducts, resulting in the continued presence of quinone structures in the aqueous phase and problems such as excessive color of depolymerization products. Studies have shown that traditional adsorption methods have a removal rate of less than 40% for quinones and cannot reverse their oxidation state. Therefore, developing novel water washing towers that combine metal removal and depolymerization product reduction functions is crucial. Summary of the Invention

[0004] To address the aforementioned technical problems, this utility model provides a highly efficient water washing tower for purifying bisphenol A, characterized by its simple structure, strong practicality, and ability to facilitate the reduction and degradation of colored bisphenol A oxidation byproducts, thereby obtaining BPA products with high purity and standard color.

[0005] To achieve the above objectives, this utility model is implemented through the following technical solution: This utility model discloses a high-efficiency water washing tower for purifying bisphenol A, comprising a water washing tower body, a water washing tower condenser, and a water washing tower heat exchanger. The water washing tower condenser is connected to the water washing tower body, and the water washing tower heat exchanger is connected to the water washing tower body. One-way check valves are provided between the water washing tower condenser, between the water washing tower body and the water washing tower heat exchanger, and between the water washing tower condenser and the water washing tower heat exchanger.

[0006] Preferably, the water washing tower includes a packing layer A and a reduction layer B. The reduction layer B is located at 1 / 4 to 1 / 2 of the bottom of the water washing tower body, and the reduction layer B contains a wire mesh tray.

[0007] Preferably, the packing layer A is located above the reduction layer B in the main body of the water washing tower, and a packing baffle is provided between the packing layer A and the reduction layer B to separate them.

[0008] Preferably, the water washing tower body includes a bottom pipe, with a discharge port N4 at the bottom center of the bottom pipe. A differential pressure level gauge L1 and a temperature measuring tube T1 are connected to the bottom side of the bottom pipe. A water inlet N3 is provided on one side of the bottom pipe, and an ear-type support is provided on the other side. The upper end of the bottom pipe is connected to the lower end of the middle pipe, and the upper end of the middle pipe is connected to the top pipe. A discharge port N1 is provided in the middle of the top of the top pipe, a feed inlet N2 is provided on one side of the top pipe, and a differential pressure level gauge L2 is provided on the other side of the top pipe.

[0009] Preferably, the inner part of the central tube is provided with a reduction layer B and a filler layer A, a No. 1 thermal insulation garment is provided on one side of the central tube, and a filler baffle is provided in the middle of the central tube.

[0010] Preferably, the middle pipe includes a lower pipe, a middle pipe, and an upper pipe. The bottom pipe is connected to the lower pipe, the lower pipe to the middle pipe, the middle pipe to the upper pipe, and the upper pipe to the top pipe through a No. 1 flange, a No. 1 sealing gasket, a No. 2 flange, a No. 1 flat washer, a No. 1 bolt, a No. 1 nut, a cross-slot countersunk screw, and a packing baffle, arranged from bottom to top.

[0011] Preferably, the water washing tower condenser includes a bottom end cap and an upper end cap. The bottom end cap is provided with a liquid inlet N3 and is connected to the main tube. The bottom side of the main tube is provided with a tube sheet, a fresh water outlet N1, and a support. The upper side of the main tube is provided with a fresh water outlet N2. The upper end cap is provided with a liquid outlet N4 and is connected to the main tube. The main body tube includes an outer main body tube and an inner main body tube located inside the outer main body tube. The outer main body tube is wrapped with a layer of No. 2 thermal insulation clothing.

[0012] Preferably, the bottom end cap is connected to the main tube by a No. 2 sealing gasket, a No. 3 flange, a No. 2 flat washer, a No. 2 bolt, and a No. 2 nut arranged from top to bottom; the upper end cap is connected to the main tube by a No. 2 sealing gasket, a No. 3 flange, a No. 2 flat washer, a No. 2 bolt, and a No. 2 nut arranged from bottom to top.

[0013] Preferably, the heat exchanger of the water washing tower has the same structure as the condenser of the water washing tower. Beneficial effects

[0014] 1. Highly efficient mass transfer and reaction process: The contact area between the fluid and the packing is greatly increased in packing layer A, which promotes the mass transfer process and improves the processing efficiency.

[0015] 2. Dual removal of metal ions and oxidation byproducts: The reduction layer B not only effectively removes metal ions, but also reduces and degrades colored bisphenol A oxidation byproducts, thereby obtaining BPA products with high purity and standard color.

[0016] 3. Stable structure and easy maintenance: All parts of the tower are tightly connected by flanges, gaskets, and other connectors, ensuring the tower's airtightness and stability. Additionally, the wire mesh tray in reduction layer B is removable, facilitating the addition or replacement of the reducing agent.

[0017] 4. Flexible temperature control: The central tube is equipped with an insulation layer on one side, and the condenser and heat exchanger have the same structure, allowing for flexible adjustment of the temperature inside the tower as needed to maintain suitable reaction conditions.

[0018] 5. The water washing tower for high-efficiency purification of bisphenol A has significant structural advantages, which can effectively improve the purification efficiency and quality of bisphenol A. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the water washing tower in this application.

[0020] Figure 2 This is a schematic diagram of the main structure of the water washing tower in this application.

[0021] Figure 3 This is a schematic diagram of the structure of the water washing tower condenser in this application.

[0022] Figure 4 This is a schematic diagram of the structure of the water washing tower heat exchanger in this application. Detailed Implementation

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

[0024] In the description of the utility model, it should be noted that the terms "upper", "lower", "inner", "outer", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the utility model.

[0025] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "setting," "connection," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0026] like Figure 1-4 The illustration shows a specific embodiment of a high-efficiency water washing tower for purifying bisphenol A. This embodiment of a high-efficiency water washing tower for purifying bisphenol A includes a water washing tower body E1, a water washing tower condenser E2, and a water washing tower heat exchanger E3. The water washing tower condenser E2 is connected to the water washing tower body E1, and the water washing tower heat exchanger E3 is connected to the water washing tower body E1. One-way check valves are provided between the water washing tower condenser E2, between the water washing tower body E1 and the water washing tower heat exchanger E3, and between the water washing tower condenser E2 and the water washing tower heat exchanger E3.

[0027] I. Overall Structure of the Water Washing Tower The water washing tower in this embodiment mainly includes a water washing tower body E1, a water washing tower condenser E2, and a water washing tower heat exchanger E3. The water washing tower condenser E2 and the water washing tower heat exchanger E3 are respectively connected to the water washing tower body E1, and one-way check valves are provided between the water washing tower condenser E2 and between the water washing tower body E1 and the water washing tower heat exchanger E3 to ensure unidirectional flow of fluid within the tower.

[0028] II. Detailed Structure of Water Scrubbing Tower Body E1 1. Bottom Pipe: The bottom of the washing tower body E1 is equipped with a bottom pipe, which is divided into three sections from bottom to top: Bottom Pipe No. 1, Bottom Pipe No. 2, and Bottom Pipe No. 3. A discharge port N4 is located at the center of the bottom of the bottom pipe for discharging the treated material. A differential pressure level gauge L1 and a temperature measuring tube T1 are connected to the bottom side of the bottom pipe for monitoring the liquid level and temperature inside the tower, respectively. A water inlet N3 is located on one side of the bottom pipe for introducing washing water; an ear-type support is located on the other side to support the entire tower body.

[0029] 2. Middle Pipe: The upper end of the bottom pipe connects to the lower end of the middle pipe. The middle pipe contains two key structural layers—a packing layer A and a reduction layer B. An insulation layer 15 is installed on one side of the middle pipe to maintain stable temperature inside the tower. A packing baffle 12 is located in the middle of the middle pipe to separate the packing layer A and the reduction layer B.

[0030] Packing layer A: Located above the reduction layer B, it contains Pall ring packing to increase the contact area between the fluid and the packing and promote the mass transfer process.

[0031] Reduction layer B: Located at the bottom 1 / 4-1 / 2 of the tower, it contains a wire mesh tray, which can be activated by heating and can also be removed to add reducing agent. The main function of reduction layer B is to reduce and degrade colored bisphenol A oxidation byproducts.

[0032] 3. Top Pipe: A top pipe is connected to the upper end of the middle pipe. A discharge port N1 is located at the top center of the top pipe for discharging purified bisphenol A. An inlet N2 is located on the side of the top pipe for introducing the bisphenol A material to be treated. A differential pressure level gauge L2 is located on the other side of the top pipe for monitoring the liquid level in the upper part of the tower.

[0033] 4. Connection method: The bottom pipe, middle pipe and top pipe are connected by flanges, gaskets, flat washers, bolts, nuts, cross-slot countersunk screws and packing baffles arranged from bottom to top to ensure the sealing and stability of the tower body.

[0034] III. Structure of the Water Washing Tower Condenser E2 and Heat Exchanger E3 The condenser E2 and heat exchanger E3 of the water washing tower have the same structure, both including a bottom head, an upper head, and a main tube. The bottom head has an inlet for introducing cooling water or heat exchange medium. The bottom side of the main tube has a tube sheet, a fresh water outlet, and a support; the upper side of the main tube has another fresh water outlet; and the upper head has an outlet. The main tube consists of an outer main tube and an inner main tube. The outer main tube is wrapped with an insulation layer to maintain a stable internal temperature. The bottom head and the main tube, as well as the upper head and the main tube, are connected by gaskets, flanges, flat washers, bolts, and nuts.

[0035] IV. Operating Procedures The bisphenol A material to be treated is introduced into the washing tower body E1 through inlet N2, and after passing through packing layer A and reduction layer B, it is discharged through outlet N4. Simultaneously, wash water is introduced through inlet N3, allowing for sufficient mass transfer and reaction with the material within the tower. A condenser and a heat exchanger are used to cool and heat the fluid within the tower, respectively, to maintain a suitable reaction temperature.

[0036] The main body of the water washing tower consists of a packing layer and a reduction layer. Structurally, it can achieve efficient mass transfer and reaction processes, which can not only effectively remove metal ions, but also reduce and degrade colored bisphenol A (ABPA) oxidation byproducts, thereby obtaining BPA products with high purity and standard color. In a preferred embodiment, the washing tower includes a packing layer A and a reduction layer B. The reduction layer B is located at the bottom 1 / 4 to 1 / 2 of the washing tower body E1, and contains a wire mesh tray. It can be activated by heating and can also be disassembled to add reducing agent.

[0037] In a preferred embodiment, the packing layer A is located above the reduction layer B in the main body E1 of the washing tower, and a packing baffle is provided between the packing layer A and the reduction layer B to separate them. The packing layer A contains Pall ring packing.

[0038] In a preferred embodiment, the water washing tower body E1 includes a bottom pipe 1, which from bottom to top includes a first bottom pipe, a second bottom pipe, and a third bottom pipe. The bottom center of the bottom pipe 1 has a discharge port N4. A differential pressure level gauge L1 and a temperature measuring tube T1 are connected to the bottom side of the bottom pipe 1. A water inlet N3 is provided on one side of the bottom pipe 1, and an ear-type support 16 is provided on the other side. The upper end of the bottom pipe 1 is connected to the lower end of the middle pipe 10. The upper end of the middle pipe 10 is connected to the top pipe 14. A discharge port N1 is provided in the middle of the top of the top pipe 14. A feed inlet N2 is provided on one side of the top pipe 14, and a differential pressure level gauge L2 is provided on the other side of the top pipe 14.

[0039] In a preferred embodiment, the inner tube 10 is provided with a reduction layer B and a filler layer A, a first thermal insulation garment 15 is provided on one side of the inner tube 10, and a filler baffle 12 is provided in the middle of the inner tube 10.

[0040] In a preferred embodiment, the middle pipe 10 includes a lower pipe, a middle pipe 13, and an upper pipe. The bottom pipe 1 is connected to the lower pipe, the lower pipe to the middle pipe 13, the middle pipe 13 to the upper pipe, and the upper pipe to the top pipe 14 through a series of components arranged from bottom to top: a first flange 4, a first sealing gasket 5, a second flange 6, a first flat washer 7, a first bolt 8, a first nut 9, a cross-slot countersunk screw 11, and a packing baffle 12.

[0041] In a preferred embodiment, the water washing tower condenser E2 includes a bottom end cap 100 and an upper end cap. The bottom end cap 100 is provided with a liquid inlet N3 and is connected to the main tube 101. The bottom side of the main tube 101 is provided with a tube sheet 40, a fresh water outlet N1, and a support 30. The upper side of the main tube 101 is provided with a fresh water outlet N2, and the upper end cap is provided with a liquid outlet N4. The upper end cap is connected to the main tube 101. The main tube 101 includes an outer main tube 102 and an inner main tube 120 disposed inside the outer main tube 102. The outer main tube 102 is wrapped with a layer of No. 2 thermal insulation clothing 110.

[0042] In a preferred embodiment, the bottom end cap 100 is connected to the main tube 101 via a series of components arranged from top to bottom: a second sealing gasket 50, a third flange 60, a second flat washer 70, a second bolt 80, and a second nut 90. The upper end cap is connected to the main tube 101 via the same components arranged from bottom to top. The heat exchanger E3 of the water washing tower has the same structure as the condenser E2 of the water washing tower.

[0043] Finally, it should be noted that this utility model is not limited to the above embodiments, and many variations are possible. All variations that can be directly derived or conceived by those skilled in the art from the disclosure of this utility model should be considered within the protection scope of this utility model.

Claims

1. A high-efficiency water washing tower for purifying bisphenol A, characterized in that, The system includes a water washing tower body (E1), a water washing tower condenser (E2), and a water washing tower heat exchanger (E3). The water washing tower condenser (E2) is connected to the water washing tower body (E1), and the water washing tower heat exchanger (E3) is connected to the water washing tower body (E1). One-way check valves are provided between the water washing tower condenser (E2), between the water washing tower body (E1) and the water washing tower heat exchanger (E3), and between the water washing tower condenser (E2) and the water washing tower heat exchanger (E3).

2. The water washing tower for high-efficiency purification of bisphenol A according to claim 1, characterized in that, The water washing tower includes a packing layer A and a reduction layer B. The reduction layer B is located at 1 / 4-1 / 2 of the bottom of the water washing tower body (E1) and contains a wire mesh tray.

3. The water washing tower for high-efficiency purification of bisphenol A according to claim 2, characterized in that, The packing layer A is located above the reduction layer B in the main body of the water washing tower (E1), and a packing baffle is provided between the packing layer A and the reduction layer B to separate them.

4. A high-efficiency water washing tower for purifying bisphenol A according to claim 1, 2, or 3, characterized in that, The water washing tower body (E1) includes a bottom pipe (1), with a discharge port N4 at the bottom center of the bottom pipe (1). A differential pressure level gauge L1 and a temperature measuring tube T1 are connected to the bottom side of the bottom pipe (1). A water inlet N3 is provided on one side of the bottom pipe (1), and an ear-type support (16) is provided on the other side. The upper end of the bottom pipe (1) is connected to the lower end of the middle pipe (10), and the upper end of the middle pipe (10) is connected to the top pipe (14). A discharge port N1 is provided in the middle of the top of the top pipe (14), and a feed inlet N2 is provided on one side of the top pipe (14). A differential pressure level gauge L2 is provided on the other side of the top pipe (14).

5. The water washing tower for high-efficiency purification of bisphenol A according to claim 4, characterized in that, The middle tube (10) is provided with a reduction layer B and a filler layer A. A No. 1 thermal insulation garment (15) is provided on one side of the middle tube (10), and a filler baffle (12) is provided in the middle of the middle tube (10).

6. The water washing tower for high-efficiency purification of bisphenol A according to claim 5, characterized in that, The middle pipe (10) includes a lower pipe, a middle pipe (13), and an upper pipe. The bottom pipe (1) is connected to the lower pipe, the lower pipe to the middle pipe (13), the middle pipe (13) to the upper pipe, and the upper pipe to the top pipe (14) through a No. 1 flange (4), a No. 1 sealing gasket (5), a No. 2 flange (6), a No. 1 flat washer (7), a No. 1 bolt (8), a No. 1 nut (9), a cross-slot countersunk screw (11), and a packing baffle (12) arranged from bottom to top.

7. The water washing tower for high-efficiency purification of bisphenol A according to claim 1, characterized in that, The water washing tower condenser (E2) includes a bottom end cap (100) and an upper end cap. The bottom end cap (100) is provided with a liquid inlet N3 and is connected to the main tube (101). The main tube (101) is provided with a tube sheet (40), a fresh water outlet N1, and a support (30) on the bottom side. The main tube (101) is provided with a fresh water outlet N2 on the upper side. The upper end cap is provided with a liquid outlet N4 and is connected to the main tube (101). The main tube (101) includes an outer main tube (102) and an inner main tube (120) located inside the outer main tube (102). The outer main tube (102) is wrapped with a layer of No. 2 thermal insulation clothing (110).

8. The water washing tower for high-efficiency purification of bisphenol A according to claim 7, characterized in that, The bottom end cap (100) is connected to the main tube (101) by a No. 2 sealing gasket (50), a No. 3 flange (60), a No. 2 flat washer (70), a No. 2 bolt (80), and a No. 2 nut (90) arranged from top to bottom; the upper end cap is connected to the main tube (101) by a No. 2 sealing gasket (50), a No. 3 flange (60), a No. 2 flat washer (70), a No. 2 bolt (80), and a No. 2 nut (90) arranged from bottom to top.

9. A high-efficiency water washing tower for purifying bisphenol A according to claim 7 or 8, characterized in that, The heat exchanger (E3) of the water washing tower has the same structure as the condenser (E2) of the water washing tower.

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