Bisphenol S production water treatment methods and equipment

Abstract

This invention belongs to the field of wastewater treatment technology, and particularly relates to a bisphenol A S Production water treatment methods and equipment, including bisphenol S The production water treatment method includes: a control module adapted to acquire the thickness of the water layer, oil layer, and emulsion layer in the extraction tank, and then control the drainage and / or oil absorption strategy according to the thickness of the water layer and the oil layer. That is, when the water layer thickness is greater than the oil layer thickness, only drainage is performed until the water layer thickness reaches a safe threshold. When the water layer thickness reaches the safe threshold, drainage and oil absorption are started simultaneously, and the drainage and oil absorption rates are adjusted in real time. This achieves the goal of maintaining the stability of the oil phase during the drainage process and avoids the need to discharge a large amount of emulsion to maintain the purity of the oil phase.

Description

Technical Field

[0001] This invention belongs to the field of wastewater treatment technology, and in particular relates to a method and equipment for treating water used in bisphenol S production. Background Technology

[0002] In the treatment of bisphenol S wastewater, the bisphenol S reaction wastewater is added to an extraction tank. After settling and stratification, a stable aqueous and oil phase is obtained. The aqueous phase is then discharged from the bottom layer, while the oil phase is preserved for the bisphenol S synthesis reaction. For example, the invention patent with publication number CN117247183A discloses a method for treating bisphenol S reaction wastewater. This method involves adding the bisphenol S reaction wastewater to an extraction tank, adding mesitylene, and stirring at 40-60℃ for 2-4 hours. After settling and stratification, the aqueous phase is then discharged from the bottom layer, while the oil phase is preserved for the bisphenol S synthesis reaction. However, to ensure the purity of the oil phase, some additional oil phase is discharged in the relevant discharge methods to ensure that the emulsion layer between the oil and aqueous phases is also discharged. However, this discharge method relies on the operator's experience and is prone to problems of excessive or insufficient discharge.

[0003] Therefore, due to the technical problem of decreased oil phase purity caused by the inability to accurately drain water, it is necessary to design a water treatment method and equipment for bisphenol S production.

[0004] It should be noted that the information disclosed in this background section is only for understanding the background technology of this application concept, and therefore, the above description is not considered to constitute prior art information. Summary of the Invention

[0005] This disclosure provides at least one method and equipment for treating water used in bisphenol S production.

[0006] In a first aspect, embodiments of this disclosure provide a method for treating water used in bisphenol S production, comprising:

[0007] The control module is adapted to obtain the thickness of the water layer, oil layer and emulsion layer in the extraction tank, and then control the drainage and / or oil absorption strategy according to the thickness of the water layer and the oil layer. That is, when the water layer thickness is greater than the oil layer thickness, only drainage is performed until the water layer thickness reaches a safe threshold. When the water layer thickness reaches the safe threshold, drainage and oil absorption are started simultaneously, and the drainage and oil absorption rates are adjusted in real time.

[0008] In one optional implementation, the security threshold is: h a =α*h oil +β;

[0009] Among them, h a α is the safety threshold; β is the reservoir influence coefficient; h is the basic safety margin; oil This represents the initial oil layer thickness.

[0010] In one alternative embodiment, the control module is adapted to control the drainage mechanism to drain water at an initial drainage rate when the water layer thickness is greater than the oil layer thickness.

[0011] The initial drainage velocity is:

[0012]

[0013] Among them, v max ρ is the initial drainage velocity; We is the Weber number safety threshold; σ is the oil-water interfacial tension; ρ water h is the density of the aqueous phase. oil This represents the initial oil layer thickness.

[0014] In one optional implementation, the control module is adapted to adjust the drainage speed of the drainage mechanism in real time after the water layer thickness drops to a safe threshold, wherein the real-time drainage speed is:

[0015]

[0016] Among them, v s ρ is the real-time drainage velocity; g is the acceleration due to gravity; ρ is the acceleration due to gravity. water ρ is the density of the aqueous phase. oil The density of the oil phase is μ. water h is the viscosity of the aqueous phase. water h represents the real-time water layer thickness. wmin The minimum water layer thickness is preset; h a This is the safety threshold.

[0017] In one optional embodiment, the control module is adapted to adjust the oil suction speed of the oil suction mechanism in real time after the water layer thickness drops to a safe threshold, wherein the real-time oil suction speed is:

[0018]

[0019] Among them, v oil This refers to the real-time oil discharge speed; v s For real-time drainage speed; h s h represents the real-time oil layer thickness. water ρ represents the real-time water layer thickness. water ρ is the density of the aqueous phase. oil ρ is the density of the oil phase.

[0020] In one alternative implementation, the control module is adapted to stop draining and oil absorption after the liquid thickness in the extraction tank reaches a preset ratio of the emulsion layer thickness.

[0021] Secondly, embodiments of this disclosure also provide a bisphenol S production water treatment system, comprising:

[0022] The acquisition module is configured to acquire the thickness of the water layer, oil layer, and emulsion layer in the extraction tank.

[0023] The control module is configured to control drainage and / or oil absorption strategies based on the thickness of the water layer and the oil layer.

[0024] Thirdly, embodiments of this disclosure also provide a computer-readable storage medium storing a computer program / instructions thereon, which, when executed by a processor, implements the steps of the above-described bisphenol S production water treatment method.

[0025] Fourthly, embodiments of this disclosure also provide a computer program product, including a computer program / instructions that, when executed by a processor, implement the steps of the above-described bisphenol S production water treatment method.

[0026] Fifthly, embodiments of this disclosure also provide a water treatment device for bisphenol S production, comprising:

[0027] Extraction tank, control module, and sensors, drainage mechanism and oil suction mechanism electrically connected to the control module;

[0028] The sensor is installed inside the extraction tank and is adapted to detect the thickness of the water layer, oil layer and emulsion layer inside the extraction tank.

[0029] The drainage mechanism is installed on the extraction tank;

[0030] The oil suction mechanism is mounted on the extraction tank;

[0031] The control module is configured to control the drainage mechanism to drain water and the oil suction mechanism to suction oil using the aforementioned bisphenol S production water treatment method.

[0032] The beneficial effects of this invention are that the water treatment method for bisphenol S production includes: a control module adapted to acquire the thickness of the water layer, oil layer, and emulsion layer in the extraction tank, and then controlling the drainage and / or oil absorption strategy according to the thickness of the water layer and the oil layer. That is, when the water layer thickness is greater than the oil layer thickness, only drainage is performed until the water layer thickness reaches a safe threshold. When the water layer thickness reaches the safe threshold, drainage and oil absorption are started simultaneously, and the drainage and oil absorption rates are adjusted in real time. This achieves the stability of the oil phase during the drainage process and avoids the need to discharge a large amount of emulsion to maintain the purity of the oil phase during the drainage process.

[0033] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention are realized and obtained through the structures particularly pointed out in the description and the drawings.

[0034] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0035] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0036] Figure 1 A flowchart of a method for treating water used in bisphenol S production, provided as an embodiment of this disclosure;

[0037] Figure 2 A schematic block diagram of a water treatment device for bisphenol S production provided in this embodiment of the present disclosure;

[0038] Figure 3 This is a schematic diagram of the liquid stratification state inside the extraction tank provided in an embodiment of this disclosure.

[0039] In the picture:

[0040] Water layer 1, emulsion layer 2, oil layer 3. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] As used herein, the phrases “in one embodiment,” “according to one embodiment,” “in some embodiments,” etc., generally refer to the fact that a particular feature, structure, or characteristic following the phrase can be included in at least one embodiment of this disclosure. Therefore, a particular feature, structure, or characteristic can be included in more than one embodiment of this disclosure, such that these phrases do not necessarily refer to the same embodiment. As used herein, the terms “example,” “exemplary,” etc., are used to “serve as an example, instance, or illustration.” Any implementation, aspect, or design described herein as “example” or “exemplary” is not necessarily to be construed as preferred or superior to other implementations, aspects, or designs. Rather, the use of the terms “example,” “exemplary,” etc., is intended to present concepts in a specific manner.

[0043] The inventors discovered that in the existing water phase discharge process, as the thickness of the water phase gradually decreases, the stability of the oil phase deteriorates, leading to discharge disturbances and interfering with the stability of the oil phase. This results in an increase in the thickness of the emulsion layer between the oil and water phases. Therefore, according to the observation standards before discharge, there may be problems with the emulsion layer not being completely discharged, or a portion of the oil phase may need to be discharged to avoid emulsion layer residue. This also leads to a reduction in the usable oil phase volume.

[0044] The shortcomings of the above solutions are the result of the inventor's practical experience and careful research. Therefore, the discovery process of the above problems and the solutions proposed in this disclosure should be considered as the inventor's contribution to this disclosure.

[0045] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0046] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0047] like Figure 1 As shown, at least one disclosed embodiment provides a method for treating water used in bisphenol S production, comprising: a control module adapted to acquire the thickness of the water layer, the oil layer, and the emulsion layer in an extraction tank, and then controlling a drainage and / or oil absorption strategy based on the water layer thickness and the oil layer thickness, i.e., when the water layer thickness is greater than the oil layer thickness, only drainage is performed until the water layer thickness reaches a safe threshold, and when the water layer thickness reaches the safe threshold, simultaneous drainage and oil absorption are started, and the drainage and oil absorption rates are adjusted in real time, thereby achieving the stability of the oil phase during the drainage process and avoiding the need to discharge a large amount of emulsion to maintain the purity of the oil phase during the drainage process.

[0048] In this embodiment, the thickness of the water layer, oil layer, and emulsion layer in the extraction tank can be directly obtained using a frequency-modulated continuous wave radar level gauge.

[0049] In this embodiment, the positional relationship between the water layer 1, the emulsion layer 2, and the oil layer 3 in the extraction tank is as follows: Figure 3 As shown, oil layer 3 floats above water layer 1, and emulsion layer 2 is located between oil layer 3 and water layer 1.

[0050] In one optional implementation, the security threshold is: h a =α*h oil +β; where h aα is the safety threshold, in meters (m); α is the oil layer influence coefficient, determined experimentally, and can be 0.3 to 0.5; β is the basic safety margin, which can be 0.1 to 0.2 m, to prevent the safety threshold from being too low when the oil layer is too thin; h oil The initial oil layer thickness is expressed in meters (m).

[0051] In one optional embodiment, the control module is adapted to control the drainage mechanism to drain water at an initial drainage rate when the water layer thickness is greater than the oil layer thickness; wherein the initial drainage rate is:

[0052]

[0053] Among them, v max The initial drainage velocity, which can be detected by a flow velocity sensor, is expressed in m / s; We is the Weber number safety threshold, which can be taken as 0.8; σ is the oil-water interfacial tension, which is 0.018 N / m; ρ water h is the density of the aqueous phase. oil This represents the initial oil layer thickness.

[0054] In this embodiment, to stabilize the emulsion interface, it is necessary to control the shear effect at the interface. That is, when the Weber number safety threshold is less than 1, surface tension dominates, the interface is stable, and the fluid maintains stratification or droplet integrity. Therefore, the maximum value of the initial drainage rate is obtained by combining the Weber number safety threshold. When the water layer thickness is greater than the oil layer thickness, drainage is carried out by the initial drainage rate. At this time, the maximum initial drainage rate not only improves the drainage efficiency but also does not damage the stability of the emulsion interface. Therefore, taking into account both the drainage rate and the stability of the interface, the Weber number safety threshold is set to 0.8 in this embodiment.

[0055] In one optional implementation, the control module is adapted to adjust the drainage speed of the drainage mechanism in real time after the water layer thickness drops to a safe threshold, wherein the real-time drainage speed is:

[0056]

[0057] Among them, v s The real-time drainage speed can be detected using flow velocity sensors, etc., and the unit is m / s; g is the acceleration due to gravity; ρ water The density of the aqueous phase is 1050 kg / m³. 3 ;ρ oil The density of the oil phase is 920 kg / m³. 3 μ water The viscosity of the aqueous phase is expressed in Pa*s; h water The real-time water layer thickness is expressed in meters (m); h wmin The minimum preset water layer thickness is expressed in meters (m); h a This is the safety threshold, measured in meters (m).

[0058] In this embodiment, when the water layer thickness reaches the safety threshold, the water layer 1 is very thin and the water flow will have a carrying effect. Therefore, it is necessary to reduce the drainage speed to avoid the carrying effect causing disturbance to the oil layer 3, and the drainage speed needs to be adjusted.

[0059] In one optional embodiment, the control module is adapted to adjust the oil suction speed of the oil suction mechanism in real time after the water layer thickness drops to a safe threshold, wherein the real-time oil suction speed is:

[0060]

[0061] Among them, v oil The real-time oil discharge rate can be detected using flow rate sensors, etc., and the unit is m / s; v s This represents the real-time drainage rate, measured in m / s; h s Real-time oil layer thickness, in meters (m); h water ρ represents the real-time water layer thickness in meters (m). water ρ is the density of the aqueous phase. oil ρ is the density of the oil phase.

[0062] In this embodiment, when the water layer thickness reaches the safety threshold, gravity infiltration of oil layer 3 begins. Therefore, it is necessary to start oil removal to avoid the impact of gravity infiltration of oil layer 3 on water layer 1. Furthermore, the formula corresponding to the oil removal rate depends on mass conservation and dynamic equilibrium to ensure that oil layer 3 is not excessively removed or accumulated.

[0063] In one optional implementation, the control module is adapted to stop draining and oil suction after the liquid thickness in the extraction tank reaches a preset ratio of the emulsion layer thickness, for example, when the liquid height in the extraction tank is 120% of the emulsion layer thickness, suction is stopped.

[0064] In this embodiment, the drainage mechanism can be a drainage pump, and the oil suction mechanism can be an oil suction pump.

[0065] Specifically, the initial oil layer thickness is 0.8m, the water layer thickness is 1m, the emulsion layer thickness is 0.2m, the oil layer influence coefficient is 0.4, and the basic safety margin is 0.15m. Therefore, the safety threshold is 0.4*0.8+0.15=0.47m. When the water layer thickness decreases to 0.47m, the drainage rate is adjusted, and oil absorption begins, with the oil absorption rate also adjusted. The Weber number safety threshold is 0.8, and the initial drainage rate is approximately 0.0046m / s. The oil droplet diameter is 50μm, the aqueous phase viscosity is 0.001Pa*s, and the real-time drainage rate is approximately 0.0019m / s. The real-time oil removal rate is approximately 0.0036m / s.

[0066] At least one other disclosed embodiment also provides a bisphenol S production water treatment system, comprising: a data acquisition module configured to acquire the thickness of the water layer, the oil layer, and the emulsion layer in an extraction tank; and a control module configured to control a drainage and / or oil absorption strategy based on the water layer thickness and the oil layer thickness.

[0067] At least one other disclosed embodiment also provides a computer-readable storage medium having a computer program / instructions stored thereon, which, when executed by a processor, implements the steps of the above-described bisphenol S production water treatment method.

[0068] At least one other disclosed embodiment also provides a computer program product, including a computer program / instructions that, when executed by a processor, implement the steps of the above-described bisphenol S production water treatment method.

[0069] like Figure 2 As shown, at least one other disclosed embodiment also provides a bisphenol S production water treatment device, including: an extraction tank, a control module, and a sensor, a drainage mechanism, and an oil suction mechanism electrically connected to the control module; the sensor is disposed in the extraction tank, and the sensor is adapted to detect the thickness of the water layer, the thickness of the oil layer, and the thickness of the emulsion layer in the extraction tank; the drainage mechanism is disposed on the extraction tank; the oil suction mechanism is disposed on the extraction tank; the control module is configured to control the drainage mechanism to drain water and control the oil suction mechanism to suction oil using the above-described bisphenol S production water treatment method.

[0070] In this embodiment, corresponding flow rate sensors can be integrated into the drainage mechanism and the oil suction mechanism to precisely control the drainage speed and the oil suction speed through the control module.

[0071] In this embodiment, the sensors for detecting the thickness of the water layer, oil layer, and emulsion layer in the extraction tank include, but are not limited to, directly acquiring the thickness using a frequency-modulated continuous wave radar level gauge, or, but are not limited to, obtaining the thickness of the water layer, oil layer, and total liquid height separately using an electronic level gauge to derive the emulsion layer thickness. That is, the sensors are not limited to, being installed at the top of the extraction tank or in any other location that does not affect the drainage process.

[0072] In summary, this bisphenol S production water treatment method includes: a control module adapted to acquire the thickness of the water layer, oil layer, and emulsion layer in the extraction tank, and then controlling the drainage and / or oil absorption strategy based on the water layer thickness and oil layer thickness. That is, when the water layer thickness is greater than the oil layer thickness, only drainage is performed until the water layer thickness reaches a safe threshold. When the water layer thickness reaches the safe threshold, drainage and oil absorption are started simultaneously, and the drainage and oil absorption rates are adjusted in real time. This achieves the stability of the oil phase during the drainage process and avoids the need to discharge a large amount of emulsion to maintain the purity of the oil phase during the drainage process.

[0073] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A method for treating water used in bisphenol S production, characterized in that, include: The control module is suitable for obtaining the thickness of the water layer, oil layer and emulsion layer in the extraction tank, and then controlling the drainage and / or oil absorption strategy according to the thickness of the water layer and the thickness of the oil layer. That is, when the thickness of the water layer is greater than the thickness of the oil layer, only drainage is performed until the thickness of the water layer reaches a safe threshold. When the thickness of the water layer reaches the safe threshold, drainage and oil absorption are started simultaneously, and the speed of drainage and oil absorption is adjusted in real time. The control module is adapted to adjust the drainage speed of the drainage mechanism in real time after the water layer thickness drops to a safe threshold. The real-time drainage speed is: Among them, v s ρ is the real-time drainage velocity; g is the acceleration due to gravity; ρ is the acceleration due to gravity. water ρ is the density of the aqueous phase. oil The density of the oil phase is μ. water h is the viscosity of the aqueous phase. water h represents the real-time water layer thickness. wmin The minimum water layer thickness is preset; h a This is a safety threshold; The control module is adapted to adjust the oil suction speed of the oil suction mechanism in real time after the water layer thickness drops to a safe threshold. The real-time oil suction speed is: Among them, v oil This refers to the real-time oil absorption speed; v s For real-time drainage speed; h s h represents the real-time oil layer thickness. water ρ represents the real-time water layer thickness. water ρ is the density of the aqueous phase. oil ρ is the density of the oil phase.

2. The method for treating water used in bisphenol S production as described in claim 1, characterized in that: The security threshold is: h a =α*h oil +β; Among them, h a α is the safety threshold; α is the reservoir influence coefficient, ranging from 0.3 to 0.5; β is the basic safety margin, ranging from 0.1 to 0.2 m; h oil This represents the initial oil layer thickness.

3. The method for treating water used in bisphenol S production as described in claim 2, characterized in that: The control module is adapted to control the drainage mechanism to drain water at an initial drainage rate when the water layer thickness is greater than the oil layer thickness. The initial drainage velocity is: Among them, v max ρ is the initial drainage velocity; We is the Weber number safety threshold; σ is the oil-water interfacial tension; ρ water h is the density of the aqueous phase. oil This represents the initial oil layer thickness.

4. The method for treating water used in bisphenol S production as described in claim 3, characterized in that: The control module is adapted to stop draining and oil absorption after the liquid thickness in the extraction tank reaches a preset ratio of the emulsion layer thickness.

5. A bisphenol S production water treatment system employing the bisphenol S production water treatment method as described in any one of claims 1-4, characterized in that, include: The acquisition module is configured to acquire the thickness of the water layer, oil layer, and emulsion layer in the extraction tank. The control module is configured to control drainage and / or oil absorption strategies based on the thickness of the water layer and the oil layer.

6. A computer-readable storage medium having a computer program / instructions stored thereon, characterized in that, When the computer program / instructions are executed by the processor, they implement the steps of the bisphenol S production water treatment method according to any one of claims 1-4.

7. A computer program product comprising a computer program / instructions, characterized in that, When the computer program / instructions are executed by the processor, they implement the steps of the bisphenol S production water treatment method according to any one of claims 1-4.

8. A water treatment device for bisphenol S production, characterized in that, include: Extraction tank, control module, and sensors, drainage mechanism and oil suction mechanism electrically connected to the control module; The sensor is installed inside the extraction tank and is adapted to detect the thickness of the water layer, oil layer and emulsion layer inside the extraction tank. The drainage mechanism is installed on the extraction tank; The oil suction mechanism is mounted on the extraction tank; The control module is configured to control the drainage mechanism to drain water and control the oil suction mechanism to suction oil using the bisphenol S production water treatment method as described in any one of claims 1-4.

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