A device for segmenting washing of tail gas of bisphenol A production
By employing condensation and segmented scrubbing technology in a bisphenol A production tail gas staged scrubbing device, the problems of high tail gas scrubbing liquid consumption and high purification costs have been solved, achieving efficient tail gas purification and resource recycling.
Patent Information
- Application Number
- CN202522077338.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-26
- Publication Date
- 2026-08-25
- Estimated Expiration
- 2035-09-26
AI Technical Summary
In existing technologies, the consumption of tail gas scrubbing liquid in the bisphenol A production process is large and the purification cost is high. The recycling of scrubbing liquid leads to the accumulation of phenol and acetone in the tower, resulting in a decrease in purification capacity.
A staged scrubbing device for bisphenol A production tail gas includes a tail gas condenser, a condensate tank, a scrubbing tower, a circulating pump, and a hollow fiber membrane module. Through condensation and staged scrubbing, purified water is used to continue scrubbing the tail gas, reducing scrubbing liquid consumption. The scrubbing liquid is filtered in the hollow fiber membrane module to improve efficiency.
It reduces wastewater discharge, improves exhaust gas scrubbing efficiency, reduces material and energy consumption, and lowers the amount of scrubbing liquid used and purification costs.
Smart Images
Figure CN224672419U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of chemical equipment technology, and in particular to a segmented scrubbing device for bisphenol A production tail gas. Background Technology
[0002] In the production of bisphenol A from phenol and acetone, a large amount of tail gas containing phenol and acetone is generated in the raw material refining, reaction, crystallization, dephenolization, isomerization, raw material recovery, pyrolysis and rearrangement, and tail gas treatment stages. With the increasing demands for low pollution, low energy consumption, and low material consumption in chemical production processes, improving tail gas purification efficiency is essential.
[0003] Currently, for large quantities of tail gas containing phenol and acetone, the phenol and acetone tail gases generated at each stage of the bisphenol A production process are generally collected separately. The phenol and acetone tail gases are then fed into a phenol tail gas scrubbing tower and an acetone tail gas scrubbing tower, respectively, for scrubbing and absorption. After removing phenol and acetone, the gases are discharged at high altitude from the top of the scrubbing towers. Utility Model Content
[0004] To enrich the product range of bisphenol A production tail gas segmented scrubbing devices and increase the selection space for bisphenol A production tail gas segmented scrubbing devices, this utility model embodiment provides a bisphenol A production tail gas segmented scrubbing device.
[0005] The present invention proposes a segmented scrubbing device for bisphenol A production tail gas, comprising: a tail gas condenser, a condensate tank, a scrubbing tower, a circulating pump, and a hollow fiber membrane assembly for filtering phenol and acetone. The washing tower is equipped with a first section of packing, a second section of packing, a first sprayer, and a second sprayer. The first section of packing and the second section of packing are arranged vertically at intervals, and the first section of packing is located above the second section of packing. The first sprayer is located above the first section of packing. The inlet of the first sprayer is connected to a demineralized water feed pipeline. The second sprayer is located between the first section of packing and the second section of packing. The gas phase outlet at the top of the washing tower is connected to a gas phase outlet pipeline. The inlet of the condensate tank is connected to a tail gas feed pipeline, which is equipped with the tail gas condenser. The gas phase outlet at the top of the condensate tank is connected to the gas phase inlet on the side of the scrubbing tower via a first pipeline, and the gas phase inlet on the side of the scrubbing tower is located below the second section of packing. The liquid phase outlet at the bottom of the scrubbing tower is connected to the inlet of the circulating pump via a second pipeline. The outlet of the circulating pump is connected to the inlet of the hollow fiber membrane module via a third pipeline. The outlet of the hollow fiber membrane module is connected to the inlet of the second sprayer via a fourth pipeline.
[0006] Optionally, the system also includes a third section of packing and a third sprayer disposed within the scrubbing tower. The third section of packing is spaced below the second section of packing, and the third sprayer is disposed between the second section of packing and the third section of packing. The third pipeline is connected to the inlet of the third sprayer via a fifth pipeline, and the gas phase inlet on the side of the scrubbing tower is located below the third section of packing.
[0007] Optionally, the first sprayer, the second sprayer, and the third sprayer are all equipped with a water outlet switch.
[0008] Optionally, the first sprayer includes a plurality of first spray pipes arranged at intervals; and / or, The second sprayer includes a plurality of second spray pipes spaced apart; and / or, The third sprayer includes multiple third spray pipes arranged at intervals.
[0009] Optionally, the outlet of each of the first spray pipes is connected to a hollow conical spiral nozzle; and / or, Each of the second spray pipes is connected to a hollow conical spiral nozzle at its outlet; and / or, Each of the third spray pipes is connected to a hollow conical spiral nozzle at its outlet.
[0010] Optionally, the liquid phase outlet at the bottom of the condensate tank is connected to the wastewater recovery and treatment unit.
[0011] Optionally, the demineralized water feed line is equipped with a demineralized water cooler.
[0012] Optionally, the outlet of the demineralized water feed pipeline is connected to the hot side inlet of the demineralized water cooler, the hot side outlet of the demineralized water cooler is connected to the inlet of the first sprayer, and the cold side of the demineralized water cooler contains a refrigerant.
[0013] Optionally, the outlet of the exhaust gas feed line is connected to the hot side inlet of the exhaust gas condenser, the hot side outlet of the exhaust gas condenser is connected to the inlet of the condensate tank, and the cold side of the exhaust gas condenser contains refrigerant.
[0014] Optionally, the hollow fiber membrane module includes a housing and a plurality of hollow fiber membrane bundles disposed within the housing for filtering phenol and acetone.
[0015] The beneficial effects of the above-mentioned technical solutions provided by the embodiments of this utility model include at least the following: The bisphenol A production tail gas staged scrubbing device provided by this utility model connects the liquid phase outlet at the bottom of the scrubbing tower to the inlet of the circulating pump via a second pipeline, the outlet of the circulating pump to the inlet of the hollow fiber membrane module via a third pipeline, and the outlet of the hollow fiber membrane module to the inlet of the second sprayer via a fourth pipeline. The circulating pump transports the scrubbing liquid discharged from the liquid phase outlet at the bottom of the scrubbing tower to the hollow fiber membrane module for filtration. The filtered purified water is then transported to the second sprayer, where it continues to scrub the tail gas. This not only reduces wastewater discharge and improves tail gas scrubbing efficiency but also significantly reduces the amount of scrubbing liquid entering the scrubbing tower from the demineralized water feed pipeline by utilizing purified water for further scrubbing. This solves the problems of high scrubbing liquid consumption and high purification costs associated with used scrubbing liquid.
[0016] The bisphenol A production tail gas staged scrubbing device provided by this utility model has a tail gas feed pipeline connected to the inlet of the condensate tank. The tail gas feed pipeline is equipped with a tail gas condenser. The gas phase outlet at the top of the condensate tank is connected to the gas phase inlet on the side of the scrubbing tower through a first pipeline. After the tail gas is condensed by the tail gas condenser, most of the phenol and acetone that need to be removed in the tail gas are condensed into condensate. The remaining non-condensable gas mainly contains nitrogen, a small amount of water, and very small amounts of phenol and acetone. Compared with the tail gas entering the scrubbing tower directly without condensation, the non-condensable gas entering the scrubbing tower requires less phenol and acetone to be washed away, consumes less scrubbing liquid, and generates less scrubbing wastewater that needs to be treated subsequently. This achieves the goal of purifying the tail gas while reducing material and energy consumption. As for the condensate stored in the condensate tank, it can also be treated separately in other subsequent processes. Attached Figure Description
[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.
[0018] Figure 1 A schematic diagram of a segmented scrubbing device for bisphenol A production tail gas provided by this utility model; Figure 2 This is a schematic diagram of the structure of a hollow conical spiral nozzle provided by this utility model.
[0019] Explanation of icon numbers: A staged scrubbing unit for tail gas from 100-bisphenol A production; 1-Exhaust gas condenser; 2-Condensate tank; 3-Scrubber; 31-First section packing; 32-Second section packing; 33-Third section packing; 34-First sprayer; 341-First spray pipe; 35-Second sprayer; 351-Second spray pipe; 36-Third sprayer; 361-Third spray pipe; 37-Hollow conical spiral nozzle; 4-Circulation pump; 5-Hollow fiber membrane module; 51-Shell; 6-Demineralized water feed line; 7-Gas phase outlet line; 8-Tail gas feed line; 9-First line; 10-Second line; 11-Third line; 12-Fourth line; 13-Fifth line; 14-Demineralized water cooler.
[0020] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation
[0021] 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.
[0022] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.
[0023] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.
[0024] Currently, for large quantities of tail gas containing phenol and acetone, the common practice is to collect the phenol and acetone tail gases generated at different stages of the bisphenol A production process separately, and then pass them into separate phenol and acetone tail gas scrubbing towers for washing and absorption. After removing phenol and acetone, the gases are discharged at high altitude from the top of the scrubbing towers. In order to reduce waste of the scrubbing liquid, existing technology typically uses a circulating pump to return the scrubbing liquid discharged from the bottom of the scrubbing tower for recycling. The inventors discovered that when a large amount of scrubbing liquid is returned to the tower for recycling, it causes an accumulation of phenol and acetone within the tower, leading to a decrease in the scrubbing tower's purification capacity. To maintain a low concentration of phenol and acetone in the scrubbing tower, fresh scrubbing liquid needs to be continuously fed into the tower, and used scrubbing liquid needs to be continuously discharged, resulting in a large consumption of fresh scrubbing liquid and high treatment costs for the discharged scrubbing liquid.
[0025] To at least partially solve the above problems, the inventors attempted to design a segmented scrubbing device for bisphenol A production tail gas. They unexpectedly discovered that by connecting a hollow fiber membrane module to the outlet of the circulating pump, the scrubbing liquid discharged from the bottom of the scrubbing tower could be filtered. The filtered purified water was then sent to a second sprayer, where the tail gas was further scrubbed with this purified water. This not only reduced wastewater discharge and improved tail gas scrubbing efficiency, but also significantly reduced the amount of scrubbing liquid entering the scrubbing tower from the demineralized water feed pipeline by using purified water to continue scrubbing the tail gas. This solved the problems of high tail gas scrubbing liquid consumption and high purification costs of used scrubbing liquid.
[0026] Based on this, the present invention provides a segmented scrubbing device for bisphenol A production tail gas. Figures 1 to 2 A specific embodiment of the bisphenol A production tail gas segmented scrubbing device provided by this utility model.
[0027] Please see Figure 1 The present invention provides a segmented scrubbing device 100 for bisphenol A production tail gas, including a tail gas condenser 1, a condensate tank 2, a scrubbing tower 3, a circulating pump 4, and a hollow fiber membrane module 5 for filtering phenol and acetone.
[0028] The washing tower 3 is equipped with a first section of packing 31, a second section of packing 32, a first sprayer 34, and a second sprayer 35. The first section of packing 31 and the second section of packing 32 are arranged vertically at intervals, and the first section of packing 31 is located above the second section of packing 32. The first sprayer 34 is located above the first section of packing 31. The inlet of the first sprayer 34 is connected to a demineralized water feed pipeline 6. The second sprayer 35 is located between the first section of packing 31 and the second section of packing 32. The gas phase outlet at the top of the washing tower 3 is connected to a gas phase outlet pipeline 7.
[0029] The inlet of the condensate tank 2 is connected to a tail gas feed pipeline 8, which is equipped with the tail gas condenser 1. The gas phase outlet at the top of the condensate tank 2 is connected to the gas phase inlet on the side of the scrubbing tower 3 via a first pipeline 9. The gas phase inlet on the side of the scrubbing tower 3 is located below the second section packing 32. The liquid phase outlet at the bottom of the scrubbing tower 3 is connected to the inlet of the circulating pump 4 via a second pipeline 10. The outlet of the circulating pump 4 is connected to the inlet of the hollow fiber membrane module 5 via a third pipeline 11. The outlet of the hollow fiber membrane module 5 is connected to the inlet of the second sprayer 35 via a fourth pipeline 12.
[0030] The bisphenol A production tail gas segmented scrubbing device 100 provided by this utility model has the following connection: the liquid phase outlet at the bottom of the scrubbing tower 3 is connected to the inlet of the circulating pump 4 via a second pipeline 10; the outlet of the circulating pump 4 is connected to the inlet of the hollow fiber membrane module 5 via a third pipeline 11; and the outlet of the hollow fiber membrane module 5 is connected to the inlet of the second sprayer 35 via a fourth pipeline 12. The scrubbing liquid discharged from the liquid phase outlet at the bottom of the scrubbing tower 3 is transported to the hollow fiber membrane module 5 for filtration via the circulating pump 4. The filtered purified water is then transported to the second sprayer 35, where it continues to scrub the tail gas. This not only reduces wastewater discharge and improves tail gas scrubbing efficiency, but also significantly reduces the amount of scrubbing liquid entering the scrubbing tower 3 from the demineralized water feed pipeline 6 by using purified water for further scrubbing. This solves the problems of high consumption of tail gas scrubbing liquid and high purification costs of used scrubbing liquid.
[0031] This utility model provides a segmented scrubbing device 100 for bisphenol A production tail gas. The inlet of a condensate tank 2 is connected to a tail gas feed pipeline 8, which is equipped with a tail gas condenser 1. The gas phase outlet at the top of the condensate tank 2 is connected to the gas phase inlet on the side of the scrubbing tower 3 via a first pipeline 9. After the tail gas is condensed by the tail gas condenser 1, most of the phenol and acetone that need to be removed in the tail gas are condensed into condensate. The remaining non-condensable gas mainly contains nitrogen, a small amount of water, and very small amounts of phenol and acetone. Compared to the tail gas entering the scrubbing tower 3 without condensation, the non-condensable gas entering the scrubbing tower 3 requires less phenol and acetone to be washed away, consumes less scrubbing liquid, and generates less wastewater for subsequent treatment. This achieves both tail gas purification and reduced material and energy consumption. The condensate stored in the condensate tank 2 can be further processed in subsequent processes, such as recycling.
[0032] It should be noted that the hollow fiber membrane module 5 is specifically designed to remove phenol and acetone. When the circulating washing liquid passes through the hollow fiber membrane module 5, the phenol and acetone in the circulating washing liquid are removed in the fiber membrane, but the demineralized water is not purified. This demineralized water can continue to enter the scrubbing tower 3 to scrub the exhaust gas.
[0033] See Figure 1 The process of the bisphenol A production tail gas segmented scrubbing device 100 provided by this utility model is as follows: The tail gas generated during bisphenol A production is condensed by the tail gas condenser 1 on the tail gas feed line 8, and the condensate is stored in the condensate tank 2. The non-condensable gas enters the scrubbing tower 3 through the first pipeline 9. The demineralized water enters the first sprayer 34 in the scrubbing tower 3 through the demineralized water feed line 6 for spraying. Part of the demineralized water enters the first section packing 31, and part of the demineralized water flows out from the bottom of the scrubbing tower 3. The outflowing scrubbing liquid, under the action of the circulating pump 4, passes through the hollow fiber membrane module 5 to remove accumulated phenol and acetone. The resulting purified water enters the second sprayer 35 in the scrubbing tower 3 through the fourth pipeline 12 for spraying. Part of the purified water enters the second section packing 32, and part of it flows out from the bottom of the scrubbing tower 3. The non-condensable gas is scrubbed from bottom to top through the second section packing 32 and the first section packing 31, so that its concentration of phenol and acetone gradually decreases. After reaching the top of the scrubbing tower 3 and meeting the standards, it is discharged through the gas phase outlet pipeline 7.
[0034] The following will describe, by way of example, a further detailed or improved implementation of the bisphenol A production tail gas segmented scrubbing device 100, in order to further improve its efficiency, reliability or for other improvement considerations.
[0035] In some embodiments, the system further includes a third section of packing 33 and a third sprayer 36 disposed within the scrubbing tower 3. The third section of packing 33 is spaced below the second section of packing 32, and the third sprayer 36 is disposed between the second section of packing 32 and the third section of packing 33. The third pipeline 11 is connected to the inlet of the third sprayer 36 via a fifth pipeline 13. The gas phase inlet on the side of the scrubbing tower 3 is located below the third section of packing 33. Thus, a portion of the scrubbing liquid discharged from the bottom of the scrubbing tower 3 can be directly input into the scrubbing tower 3 to scrub the exhaust gas. By adding a section of packing and a sprayer, and when the first sprayer 34, the second sprayer 35, and the third sprayer 36 operate simultaneously, the exhaust gas scrubbing efficiency is significantly improved.
[0036] In some embodiments, the first sprayer 34, the second sprayer 35, and the third sprayer 36 are all equipped with water outlet switches (not shown in the figure). Thus, the first sprayer 34, the second sprayer 35, and the third sprayer 36 can be independently opened and closed as needed, allowing for flexible use of one, two, or three sections of packing material based on changes in the exhaust gas treatment volume, thereby improving adaptability to variations in exhaust gas treatment volume under different operating conditions. Specifically, firstly, a certain amount of demineralized water is introduced into the scrubbing tower 3 through the demineralized water feed pipeline 6, so that at least a certain amount of circulating scrubbing liquid is stored in the second pipeline 10. Ideally, the second pipeline 10, the third pipeline 11, the fourth pipeline 12, and the fifth pipeline 13 all store corresponding scrubbing liquid. In this case, the scrubbing liquid stored in the second pipeline 10, the third pipeline 11, and the fifth pipeline is circulating scrubbing liquid, and the scrubbing liquid stored in the fourth pipeline 12 is purified water. Then, when the phenol and acetone content in the non-condensable gas is low and the circulating washing liquid is not saturated, it is sufficient to wash the non-condensable gas with only the circulating washing liquid. At this time, one section of packing (i.e., the third section of packing 33) is activated, the outlet switch of the third sprayer 36 is opened, and the circulating pump 4 is started. When the concentration of non-condensable gas is slightly higher, the non-condensable gas needs to be washed with both circulating washing liquid and purified water. At this time, two sections of packing (i.e., the second section of packing 32 and the third section of packing 33) are activated, the outlet switches of the second sprayer 35 and the third sprayer 36 are opened, and the circulating pump 4 is started. When the concentration of non-condensable gas is even higher, the non-condensable gas needs to be washed with both circulating washing liquid, purified water, and demineralized water. At this time, three sections of packing (i.e., the first section of packing 31, the second section of packing 32, and the third section of packing 33) are activated, the outlet switches of the first sprayer 34, the second sprayer 35, and the third sprayer 36 are opened, and the circulating pump 4 is started.
[0037] To increase the spray range, improve the gas-liquid contact area, and achieve a more uniform and comprehensive distribution of the scrubbing liquid on the packing surface, thereby improving the exhaust gas purification efficiency, in some embodiments, the first sprayer 34 includes a plurality of first spray pipes 341 spaced apart. The second sprayer 35 includes a plurality of second spray pipes 351 spaced apart. The third sprayer 36 includes a plurality of third spray pipes 361 spaced apart. Specifically, the first sprayer 34 includes a plurality of first spray pipes 341 spaced apart along its own horizontal plane, and the second sprayer 35 is similar to the third sprayer 36.
[0038] See Figure 2In some embodiments, the outlet of each of the first spray pipes 341 is connected to a hollow conical spiral nozzle 37. The outlet of each of the second spray pipes 351 is connected to a hollow conical spiral nozzle 37. The outlet of each of the third spray pipes 361 is connected to a hollow conical spiral nozzle 37. Through the hollow conical spiral nozzle 37, the washing liquid sprayed from each spray pipe can form a conical atomized liquid surface, further increasing the gas-liquid contact area and improving the exhaust gas purification efficiency.
[0039] In some embodiments, the liquid outlet at the bottom of the condensate tank 2 is connected to a wastewater recovery and treatment unit. Thus, the phenol and acetone in the condensate, after being recovered and treated in the wastewater recovery and treatment unit, can be used as raw materials for the bisphenol A production unit, reducing both wastewater discharge and the production cost of bisphenol A.
[0040] Considering that lower-temperature demineralized water provides better washing results before entering the first sprayer 34, in some embodiments, the demineralized water feed line 6 is equipped with a demineralized water cooler 14 to lower the temperature of the demineralized water in the feed line 6. Specifically, the outlet of the demineralized water feed line 6 is connected to the hot-side inlet of the demineralized water cooler 14, and the hot-side outlet of the demineralized water cooler 14 is connected to the inlet of the first sprayer 34. The cold side of the demineralized water cooler 14 contains a refrigerant. This indirect heat exchange method lowers the temperature of the demineralized water without contaminating it. The type of refrigerant is not limited and can be selected according to actual conditions; for example, chilled water is used as the refrigerant.
[0041] In some embodiments, the outlet of the exhaust gas feed line 8 is connected to the hot-side inlet of the exhaust gas condenser 1, the hot-side outlet of the exhaust gas condenser 1 is connected to the inlet of the condensate tank 2, and the cold side of the exhaust gas condenser 1 contains refrigerant. The type of refrigerant is not limited and can be selected according to actual conditions; for example, chilled water is used as the refrigerant.
[0042] In some embodiments, the hollow fiber membrane module 5 includes a housing 51 and a plurality of hollow fiber membrane bundles (not shown in the figure) disposed within the housing 51 for filtering phenol and acetone. The removal of phenol and acetone accumulated in the circulating washing liquid through the plurality of hollow fiber membrane bundles improves the filtration efficiency.
[0043] The inventors of this application conducted experiments using the bisphenol A production tail gas segmented scrubbing device 100 described in this embodiment. The specific operation process is as follows: tail gases containing phenol and acetone generated at each stage of the bisphenol A production process are fed into the bisphenol A production tail gas segmented scrubbing device 100. Measurements show that the production tail gas temperature is 90℃, pressure is 103 kPa, and flow rate is 1023 kg / h, containing 920.4 kg / h nitrogen, 87.1 kg / h phenol, 1.2 kg / h acetone, and 14.3 kg / h water. After the production tail gas is collected and mixed, it is condensed by the tail gas condenser 1 to form condensate and non-condensable gas. The condensate is sent to the subsequent recovery section, while the non-condensable gas is sent to the scrubbing tower 3 for segmented scrubbing. At this point, the non-condensable gas temperature is measured to be 10℃, the pressure to be 103 kPa, and the mass flow rate to be 925 kg / h, containing 920.4 kg / h nitrogen, 4.4 kg / h water, 0.3 kg / h phenol, and 0.03 kg / h acetone. The non-condensable gas enters the gas phase inlet on the side of the scrubbing tower 3 through the first pipeline 9. The demineralized water is cooled to 10℃ by the demineralized water cooler 14 and then sent to the scrubbing tower 3 as the scrubbing liquid. The scrubbing liquid flows out from the bottom of the tower, is pressurized by the circulating pump 4, and most of it is sent back to the third-stage packing 33. A small portion of the discharged scrubbing liquid is sent to the hollow fiber membrane module 5. After membrane purification to remove accumulated phenol and acetone, the resulting purified water is sent to the second-stage packing 32 inside the scrubbing tower 3, while the demineralized water enters the first-stage packing 31. Non-condensable gases pass sequentially from the bottom of the tower through the third packing section 33, the second packing section 32, and the first packing section 31, with their concentration decreasing until they reach the discharge standard at the top of the tower. Measurements showed that the temperature of the exhaust gas at the top of the scrubbing tower was 14℃, the pressure was 102 kPa, and the volumetric flow rate was 781 Nm³. 3 The flow rate is 927 kg / h, including 918.0 kg / h of nitrogen, 9.1 kg / h of water, 0.00089 kg / h of phenol, and 0.0083 kg / h of acetone. The concentration of phenol in the exhaust gas is 1.14 mg / Nm3, and the concentration of acetone is 10.63 mg / Nm3. 3 The phenol concentration is below the environmental standard requirement of 20 mg / Nm³. 3 Acetone concentration 80 mg / Nm 3 .
[0044] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the concept of the present utility model and using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included in the patent protection scope of the present utility model.
Claims
1. A staged scrubbing device for bisphenol A production tail gas, characterized in that, include: Exhaust gas condenser, condensate tank, scrubbing tower, circulating pump, and hollow fiber membrane module for filtering phenol and acetone; The washing tower is equipped with a first section of packing, a second section of packing, a first sprayer, and a second sprayer. The first section of packing and the second section of packing are arranged vertically at intervals, and the first section of packing is located above the second section of packing. The first sprayer is located above the first section of packing. The inlet of the first sprayer is connected to a demineralized water feed pipeline. The second sprayer is located between the first section of packing and the second section of packing. The gas phase outlet at the top of the washing tower is connected to a gas phase outlet pipeline. The inlet of the condensate tank is connected to a tail gas feed pipeline, which is equipped with the tail gas condenser. The gas phase outlet at the top of the condensate tank is connected to the gas phase inlet on the side of the scrubbing tower via a first pipeline, and the gas phase inlet on the side of the scrubbing tower is located below the second section of packing. The liquid phase outlet at the bottom of the scrubbing tower is connected to the inlet of the circulating pump via a second pipeline. The outlet of the circulating pump is connected to the inlet of the hollow fiber membrane module via a third pipeline. The outlet of the hollow fiber membrane module is connected to the inlet of the second sprayer via a fourth pipeline.
2. The bisphenol A production tail gas staged scrubbing device as described in claim 1, characterized in that, It also includes a third section of packing and a third sprayer installed in the scrubbing tower. The third section of packing is arranged at intervals below the second section of packing. The third sprayer is provided between the second section of packing and the third section of packing. The third pipeline is connected to the inlet of the third sprayer through a fifth pipeline. The gas phase inlet on the side of the scrubbing tower is located below the third section of packing.
3. The bisphenol A production tail gas staged scrubbing device as described in claim 2, characterized in that, The first sprayer, the second sprayer and the third sprayer are all equipped with a water outlet switch.
4. The bisphenol A production tail gas staged scrubbing device as described in claim 2, characterized in that, The first sprayer includes a plurality of first spray pipes arranged at intervals; and / or, The second sprayer includes a plurality of second spray pipes spaced apart; and / or, The third sprayer includes multiple third spray pipes arranged at intervals.
5. The bisphenol A production tail gas staged scrubbing device as described in claim 4, characterized in that, Each of the first spray pipes is connected to a hollow conical spiral nozzle at its outlet; and / or, Each of the second spray pipes is connected to a hollow conical spiral nozzle at its outlet; and / or, Each of the third spray pipes is connected to a hollow conical spiral nozzle at its outlet.
6. The bisphenol A production tail gas staged scrubbing device as described in claim 1, characterized in that, The liquid phase outlet at the bottom of the condensate tank is connected to the wastewater recovery and treatment unit.
7. The bisphenol A production tail gas staged scrubbing device as described in claim 1, characterized in that, The demineralized water feed pipeline is equipped with a demineralized water cooler.
8. The bisphenol A production tail gas staged scrubbing device as described in claim 7, characterized in that, The outlet of the demineralized water feed pipeline is connected to the hot side inlet of the demineralized water cooler, the hot side outlet of the demineralized water cooler is connected to the inlet of the first sprayer, and the cold side of the demineralized water cooler contains refrigerant.
9. The bisphenol A production tail gas staged scrubbing device as described in claim 1, characterized in that, The outlet of the exhaust gas feed pipeline is connected to the hot side inlet of the exhaust gas condenser, the hot side outlet of the exhaust gas condenser is connected to the inlet of the condensate tank, and the cold side of the exhaust gas condenser contains refrigerant.
10. The bisphenol A production tail gas staged scrubbing device as described in claim 1, characterized in that, The hollow fiber membrane module includes a housing and a plurality of hollow fiber membrane bundles disposed within the housing for filtering phenol and acetone.