Automatic device for treating salicylic acid production wastewater

Abstract

The present application relates to wastewater treatment technical field, specifically is a kind of automatic processing device of salicylic acid production wastewater, including the centrifugal extraction mechanism of phenolic substance in wastewater is separated and recovered, also include the treatment tank for demulsification separation of high salt substance in wastewater, the effluent port of treatment tank lower portion is communicated with the wastewater phase inlet of centrifugal extraction mechanism by connecting pipeline, the present application is pretreated to wastewater using treatment tank, by shear turbine one and shear turbine two rotation, mechanical shearing emulsion drop in wastewater to break its interface film, again using flow passage one, flow passage two, flow passage three and flow passage four to the emulsion drop that is broken up are gradually conducted and coalesce, simultaneously combining with the precise metering and putting of dosing assembly on dosing pipe to demulsifier, make the small emulsion drop that difficult to separate in wastewater coalesce and form size larger, easy to separate stable emulsion drop, finally realize the high quality, high efficiency separation of extraction agent phase and wastewater phase.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, specifically an automatic treatment device for salicylic acid production wastewater. Background Technology

[0002] The wastewater generated during the production of salicylic acid has a complex composition. It contains not only phenolic substances with recycling value, such as salicylic acid and phenol, but also high concentrations of inorganic salts, mainly Na2SO4. Direct discharge of this type of wastewater will cause serious environmental pollution. On the other hand, the phenolic substances are valuable chemical raw materials or intermediates, and direct disposal will also lead to resource waste. Therefore, effective treatment of salicylic acid production wastewater to achieve the recovery of phenolic substances and the purification of wastewater can achieve both environmental and economic benefits.

[0003] Currently, centrifugal extractors are a commonly used liquid phase separation device for the recovery of phenolic substances from wastewater. During operation, the centrifugal extractor generates centrifugal force through high-speed rotation and utilizes the density difference within the high-speed centrifugal field to rapidly separate the immiscible phenolic wastewater phase from the extractant phase. Because phenolic substances have higher solubility in the extractant phase, they diffuse from the aqueous phase to the extractant phase during the mixing process, thereby achieving efficient recovery of phenolic substances from the wastewater.

[0004] However, the wastewater from salicylic acid production also contains high concentrations of salt, which significantly alters the density, viscosity, and interfacial tension of the aqueous phase. Furthermore, salicylic acid, phenol, and other substances possess surfactant properties. Under the combined effects of high-speed centrifugal shearing and a high-salt environment, the extractant and aqueous phase are easily broken down into micron-sized, interfacially stable droplets. These droplets include oil droplets and solid flocs. The extremely small and stable size of these droplets reduces the density difference between the two phases and blurs the interface, making it difficult for traditional centrifugal force to completely separate them.

[0005] As a result, after being processed by the centrifugal extractor, both the extractant phase rich in phenols, which should have been clearly separated, and the wastewater phase after phenol removal were turbid and heavily mixed. This not only significantly reduced the recovery rate of the target phenolic substances and caused resource loss, but also resulted in the loss of expensive extractant with the wastewater, leading to a surge in operating costs and severely restricting the practical application effect and economic efficiency of the technology.

[0006] In summary, there is an urgent need for an automated treatment device for salicylic acid production wastewater that can efficiently pre-treat the wastewater before it enters the centrifugal extractor. Specifically, through the synergistic action of mechanical and chemical processes, it actively aggregates the difficult-to-separate micron-sized droplets in the wastewater into larger, stable droplets, allowing the larger droplets to be rapidly separated under gravity or centrifugal force. By employing a tiered treatment strategy of first agglomeration and demulsification, followed by centrifugal separation, it solves the core problems of existing technologies, such as phase entrainment, low separation efficiency, and loss of phenolic substances and extractants. Summary of the Invention

[0007] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: an automatic treatment device for salicylic acid production wastewater, including a centrifugal extraction mechanism for separating and recovering phenolic substances in the wastewater, and a treatment tank for demulsifying and separating high-salt substances in the wastewater. The outlet of the lower part of the treatment tank is connected to the wastewater inlet of the centrifugal extraction mechanism through a connecting pipeline.

[0008] The inner cavity of the processing tank is divided into four channels from top to bottom: channel one, channel two, channel three, and channel four. Each of these channels consists of a wide upper section for dispersing emulsion droplets and a narrow lower section for agglomerating emulsion droplets.

[0009] The treatment tank is equipped with a drive assembly consisting of a shear turbine 1 and a shear turbine 2 for gradient weakening shearing and breaking up emulsion droplets, and a propulsion blade 1 and a propulsion blade 2 for gradient decaying stirring and coalescing emulsion droplets. The treatment tank is equipped with dosing pipes at equal intervals along the vertical direction, and dosing pipes are equipped with dosing components for adding precisely measured demulsifier to the wastewater.

[0010] The wastewater inside the treatment tank flows from top to bottom, achieving a sequential synergistic effect of powerful crushing, gentle agglomeration, and chemical demulsification. This promotes the formation of larger, easily separable, and stable droplets from tiny droplets, thereby enabling the centrifugal extraction mechanism to separate the extractant phase and the wastewater phase with high quality.

[0011] Preferably, the cross-sectional areas of the wide and narrow sections on the first, second, third, and fourth flow channels decrease sequentially, thereby gradually agglomerating the emulsion droplets in the wastewater flowing from top to bottom.

[0012] Preferably, the number of blades and the tilt angle of the first shear turbine are both greater than those of the second shear turbine, so that when treating wastewater, the first shear turbine can break up the emulsion droplets more quickly than the second shear turbine.

[0013] Preferably, the number of blades of the first propeller blade and the second propeller blade decreases sequentially, and the edges of the blades of the first propeller blade and the second propeller blade are both non-sharp arc-shaped structures.

[0014] Preferably, the drive assembly includes a drive shaft and a non-powered shaft that are rotatably disposed at the axis of the processing tank and distributed vertically. The drive shaft is fixedly connected to shear turbine one, shear turbine two and propulsion blade one, and the non-powered shaft is fixedly connected to propulsion blade two.

[0015] Preferably, the centrifugal extraction mechanism includes a synchronous motor located at the top for providing centrifugal force, and the output shaft of the synchronous motor is connected to the upper side of the drive shaft via a belt.

[0016] Preferably, the drug injection assembly includes flow valves fixedly connected to the drug injection pipe, and the two upper flow valves and the two lower flow valves are respectively connected to the drug supply pipe.

[0017] Preferably, a feeding pipe is provided on the upper front side of the treatment tank, which communicates with its inner cavity. The feeding pipe is used to introduce salicylic acid production wastewater into the treatment tank.

[0018] Preferably, several turbulence plates are fixedly arranged at equal intervals along the circumference of the inner wall of the wide area of ​​the flow channel four. The turbulence plates weaken the kinetic energy of the wastewater and promote the collision and aggregation of tiny droplets.

[0019] Preferably, the spoiler has a vortex structure, and the spiral direction of the spoiler is opposite to the rotation direction of the second propeller blade.

[0020] The beneficial effects of this invention are as follows: First, this invention uses a treatment tank to pretreat the wastewater flowing into the centrifugal extraction mechanism. The drive assembly drives the first and second shear turbines to rotate, mechanically shearing the emulsion droplets in the wastewater to break their interfacial film. Then, the structure of the first, second, third, and fourth channels, which are wide and narrow from top to bottom, guides and aggregates the dispersed emulsion droplets step by step. At the same time, combined with the precise metering and dosing of the demulsifier by the dosing assembly on the dosing pipe, through the synergistic effect of mechanical and chemical processes, the tiny emulsion droplets that are difficult to separate in the wastewater aggregate into larger, more easily separated, stable droplets, thereby significantly reducing the separation load of the subsequent centrifugal extraction mechanism and ultimately achieving high-quality and efficient separation of the extractant phase and the wastewater phase.

[0021] II. This invention uses a synchronous motor at the top of the centrifugal extraction mechanism as a power source. The transmission shaft is driven to rotate via a belt, which in turn drives the shear turbine I, shear turbine II, and propeller blade I fixed thereon to rotate synchronously. By setting the number of blades and the inclination angle of shear turbine I to be greater than those of shear turbine II, a decreasing, gradually weakening mechanical shearing and breaking down of the emulsion droplets in the wastewater is achieved. At the same time, the actively rotating propeller blade I and the passively rotating propeller blade II form a decreasing, gentle stirring of the wastewater, increasing the collision frequency and contact time between the dispersed emulsion droplets. Thus, while efficiently breaking down the initial emulsion state, it effectively promotes the collision and aggregation of fine emulsion droplets, achieving the synergy and balance of the two key processes of powerful breaking down and gentle aggregation.

[0022] Third, this invention uses a flow valve on the dosing pipe as the core control component of the dosing assembly. The flow valve precisely controls the opening and closing of each dosing pipe and the flow rate. According to the actual needs of wastewater treatment, the demulsifier is metered and added to the flow channels at different heights in the treatment tank through the dosing pipeline. The demulsifier chemically destroys the interfacial film of the emulsion droplets, which effectively complements the physical demulsification. Through the synergistic demulsification of physicochemical processes, the overall demulsification effect is greatly improved.

[0023] Fourth, this invention employs a turbulence plate on the inner wall of the flow channel four to effectively consume and weaken the flow kinetic energy of the wastewater, prolonging the time the wastewater remains inside the flow channel four and increasing the chances of collision and aggregation between tiny droplets. At the same time, by setting the spiral direction of the turbulence plate to be opposite to the rotation direction of the propeller blade two, the stirring dimension and turbulence intensity of the wastewater can be further increased within the flow channel four, thereby further enhancing the aggregation effect of the dispersed droplets in the final stage of aggregation, ensuring that the droplet size in the wastewater entering the centrifugal extraction mechanism is maximized, and creating optimal conditions for the final efficient centrifugal separation. Attached Figure Description

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0025] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0026] Figure 2 This is a partial cross-sectional view of the present invention.

[0027] Figure 3 This is a partial sectional view of the treatment tank, dosing pipe, drive shaft, and non-powered shaft in this invention.

[0028] Figure 4 This is a partial cross-sectional view of the processing tank, shear turbine one, shear turbine two, and propulsion blade one in this invention.

[0029] Figure 5 This is a cross-sectional view of the processing tank and the baffle in this invention.

[0030] In the diagram: 1. Centrifugal extraction mechanism; 2. Processing tank; 3. Drive assembly; 4. Shear turbine one; 5. Dosing pipe; 11. Connecting pipe; 12. Synchronous motor; 21. Flow channel one; 22. Flow channel two; 23. Flow channel three; 24. Flow channel four; 25. Feeding pipe; 31. Drive shaft; 32. Unpowered shaft; 41. Shear turbine two; 42. Propeller blade one; 43. Propeller blade two; 51. Dosing assembly; 241. Baffle plate; 511. Flow valve; 512. Dosing supply pipe. Detailed Implementation

[0031] The embodiments of the present invention are described in detail below. The embodiments described below are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention. Where specific techniques or conditions are not specified in the embodiments, they shall be performed in accordance with the techniques or conditions described in the literature in the art or in accordance with the product manual.

[0032] See Figure 1 and Figure 2 An automatic treatment device for salicylic acid production wastewater includes a centrifugal extraction mechanism 1 for separating and recovering phenolic substances in the wastewater, and a treatment tank 2 for demulsifying and separating high-salt substances in the wastewater. A feeding pipe 25 is provided on the upper front side of the treatment tank 2, which is connected to its inner cavity. When treating wastewater, salicylic acid production wastewater is introduced into the treatment tank 2 through the feeding pipe 25. The outlet at the lower part of the treatment tank 2 is connected to the wastewater inlet of the centrifugal extraction mechanism 1 through a connecting pipe 11. After the emulsion droplets in the wastewater are demulsified by the treatment tank 2 in a physicochemical synergistic manner, the wastewater flows into the centrifugal extraction mechanism 1 through the connecting pipe 11.

[0033] It is worth noting that the centrifugal extraction mechanism 1 in this invention adopts a centrifugal extractor commonly used in the prior art. The core of the centrifugal extractor is a high-speed rotating drum. The drum uses high-speed rotation to generate strong centrifugal force. The wastewater phase to be treated and the extractant phase are fed into the mixing channel at the bottom of the drum in a set ratio. In the intense turbulence, the two phases are fully mixed. The target substances such as phenols in the water are rapidly transferred to the extractant. Then, under the action of strong centrifugal force, the denser wastewater phase is thrown to the outer edge of the drum, while the less dense extractant phase is pushed to the central axis of the drum. Finally, the two separated liquid phases are continuously discharged along different paths, thereby completing the recovery of target substances such as phenols from the wastewater.

[0034] See Figure 2 , Figure 3 and Figure 4The inner cavity of the treatment tank 2 is divided from top to bottom into flow channels 1 (21), 22, 3 (23), and 4 (24). Flow channels 1 (21), 22, 3, and 4 each consist of a wide upper section for dispersing emulsion droplets and a narrow lower section for coalescing emulsion droplets. The cross-sectional areas of the wide and narrow sections in flow channels 1 (21), 22, 3, and 4 (24) decrease sequentially. For example, the cross-sectional area of ​​the wide section in flow channel 2 (22) is smaller than the cross-sectional area at the corresponding position of the wide section in flow channel 1 (21). The cross-sectional area of ​​the narrow section of 22 is smaller than the cross-sectional area of ​​the corresponding position of the narrow section of flow channel 21; thus, the wastewater flowing into the treatment tank 2 from the feeding pipe 25 can flow from top to bottom under the action of water pressure and gravity and pass through the wide and narrow sections of flow channel 21, the wide and narrow sections of flow channel 22, the wide and narrow sections of flow channel 23, and the wide and narrow sections of flow channel 24 in sequence, thereby gradually dispersing, colliding and squeezing the wastewater. This dynamic hydraulic condition can force the stable tiny droplets in the wastewater to coalesce into larger droplets.

[0035] Continue reading Figure 2 , Figure 3 and Figure 4 Inside the processing tank 2, a drive assembly 3 is provided with shear turbine 4 and shear turbine 41 for breaking the droplet interface film by mechanical shearing, and propeller blades 42 and 43 for stirring and agglomerating the droplets. The shear turbine 4, shear turbine 41, propeller blades 42 and 43 are arranged from top to bottom, with shear turbine 4 located inside the wide area of ​​flow channel 21; shear turbine 41 located inside the wide area of ​​flow channel 22; propeller blade 42 located inside the wide area of ​​flow channel 3 23; and propeller blade 43 located inside the wide area of ​​flow channel 4 24.

[0036] When the wastewater passes through the wide zone, it is mechanically sheared by the corresponding shear turbine 4 or shear turbine 41; it is actively stirred by the propulsion blade 42; and it is passively stirred by the propulsion blade 43. When the wastewater passes through the narrow zone, the structure that narrows gradually guides and aggregates the dispersed droplets.

[0037] See Figure 1 , Figure 2 and Figure 3 The drive assembly 3 includes a drive shaft 31 and a non-powered shaft 32, which are rotatably arranged on the axis of the processing tank 2 and distributed vertically. The drive shaft 31 is fixedly connected to the first shear turbine 4, the second shear turbine 41 and the first propeller blade 42, and the non-powered shaft 32 is fixedly connected to the second propeller blade 43. The centrifugal extraction mechanism 1 includes a synchronous motor 12 arranged at the top for providing centrifugal force. The output shaft of the synchronous motor 12 is connected to the upper side of the drive shaft 31 via a belt.

[0038] In this embodiment, a pulley is provided on the drive shaft 31, which is connected to the belt. A planetary reduction structure is provided between the pulley and the drive shaft 31, so that the synchronous motor 12 can drive the drive shaft 31 to rotate at a speed less than that of the centrifugal extraction mechanism 1 without changing the rotation speed. In addition, in this embodiment, the rotation of the drive shaft 31 can be independently controlled by adding a new motor, so that the power source of the drive shaft 31 and the centrifugal extraction mechanism 1 do not interfere with each other.

[0039] When treating wastewater, the synchronous motor 12 is started to drive the drum inside the centrifugal extraction mechanism 1 to rotate at high speed, so that the centrifugal extraction mechanism 1 mixes and separates the wastewater phase and the extractant phase inside it. At the same time, the synchronous motor 12 drives the transmission shaft 31 to rotate through the belt, so that the transmission shaft 31 drives the shear turbine 4, the shear turbine 41, and the propeller blade 42 to rotate synchronously. Thus, the shear turbine 4 and the shear turbine 41 break the emulsion droplet interface film in the wastewater flowing into the flow channel 21 and the flow channel 22 through the mechanical shearing force of high speed rotation.

[0040] See Figure 3 and Figure 4 The number of blades and the inclination angle of shear turbine 4 are both greater than those of shear turbine 41. This allows shear turbine 4 to break up emulsion droplets more quickly than shear turbine 41 when treating wastewater, achieving a decreasing, gradually weakening mechanical shearing and crushing of emulsion droplets in wastewater, thus improving the effect of breaking up emulsion droplets.

[0041] The wastewater then continues to flow downwards into the interior of channel 3 23. The rotating propeller blade 1 42 actively agitates the wastewater, thereby actively increasing the collision probability of the dispersed droplets in the wastewater. After flowing downwards into the interior of channel 4 24, the wastewater flows through propeller blade 2 43, causing the flowing wastewater to drive propeller blade 2 43 to rotate, thereby causing propeller blade 2 43 to passively and gently agitate the wastewater.

[0042] Continue reading Figure 3 and Figure 4 The number of blades in propeller blade 1 (42) and propeller blade 2 (43) decreases sequentially, and the edges of the blades in propeller blade 1 (42) and propeller blade 2 (43) are non-sharp arc-shaped structures. The wastewater flows from flow channel 3 (23) to flow channel 4 (24), which transforms the active and violent stirring of the wastewater by propeller blade 1 (42) into the passive and gentle stirring of the wastewater by propeller blade 2 (43). This forms a gradual and gentle stirring of the wastewater, achieving the synergy and balance of the two key processes of powerful crushing and gentle agglomeration. This prevents the large droplets that have already agglomerated from being dispersed, while increasing the collision frequency between the dispersed droplets, effectively promoting the collision and agglomeration of small droplets.

[0043] It should be noted that in this embodiment, wastewater is pumped into the treatment tank 2 by a water supply pump, so that the wastewater has a certain flow rate, thereby enabling the wastewater to drive the second propeller blade 43 to rotate. The flow rate of the wastewater is controlled by the water supply pump so that the rotation speed of the second propeller blade 43 is less than that of the first propeller blade 42.

[0044] See Figure 1 , Figure 2 and Figure 3 The treatment tank 2 is provided with dosing pipes 5 at equal intervals along the vertical direction. The dosing pipes 5 are equipped with a dosing assembly 51 that accurately measures the demulsifier and adds it into the treatment tank 2. The dosing assembly 51 includes flow valves 511 fixedly connected to the dosing pipes 5. The two upper flow valves 511 and the two lower flow valves 511 are respectively connected to the drug supply pipeline 512. That is, the two upper flow valves 511 are connected to the upper drug supply pipeline 512, and the two lower flow valves 511 are connected to the lower drug supply pipeline 512.

[0045] When wastewater flows within the inner cavity of treatment tank 2, demulsifying agent is introduced into the supply pipeline 512. Subsequently, the opening and closing of each dosing pipe 5 and the flow rate are precisely and quantitatively controlled by the flow valve 511. Based on the actual needs of wastewater treatment, the flow valve 511 is opened, allowing the demulsifying agent in the supply pipeline 512 to flow through the dosing pipe 5 into the inner cavity of treatment tank 2. This chemically destroys the interfacial film of the emulsion droplets, effectively complementing the physical demulsification effect. Through the synergistic demulsification of physicochemical processes, the overall demulsification effect is significantly improved.

[0046] It should be noted that the treatment tank 2 is equipped with an online turbidity meter, which can monitor the emulsification degree inside the treatment tank 2 in real time and feed it back to the host computer. Then, the host computer quickly controls the flow valve 511 to inject the demulsifying agent into the treatment tank 2 in a small amount and at a fixed point. The demulsifying agent can chemically destroy the interfacial membrane of the tiny emulsion droplets. The addition of the demulsifying agent is controlled by a closed-loop feedback method, which can ensure that the appropriate amount of demulsifying agent is maintained in real time and prevent the demulsifying agent from becoming a new contaminant.

[0047] It is worth noting that in this embodiment, an oleophilic demulsifier is introduced into the upper drug supply pipe 512. Through the high-intensity mechanical shearing of shear turbine 4 and shear turbine 41, the interface film of the oily emulsion droplets is chemically destroyed, causing the oil droplets to destabilize. A hydrophilic flocculant is introduced into the lower drug supply pipe 512. Through the low-intensity agitation inside the flow channel 23 and flow channel 24, the solid is destabilized and flocs are formed, causing the emulsion droplets to aggregate in the same phase.

[0048] To improve the aggregation effect of micro-droplets within the flow channel 24, the present invention designs the following structure: (See reference) Figure 3 , Figure 4 and Figure 5Several turbulence plates 241 are fixedly arranged at equal intervals along the circumference of the inner wall of the wide area of ​​the flow channel 24. The turbulence plates 241 weaken the kinetic energy of the wastewater and promote the collision and aggregation of the tiny droplets. The turbulence plates 241 have a vortex-like structure, and the spiral direction of the turbulence plates 241 is opposite to the rotation direction of the propeller blade 2 43.

[0049] When wastewater flows through channel 24, the flow is blocked by baffle 241, which effectively consumes and weakens the kinetic energy of the wastewater flow and prolongs the time the wastewater stays inside channel 24. This increases the chance of collision and aggregation between tiny droplets. At the same time, by setting the spiral direction of baffle 241 to be opposite to the rotation direction of propeller blade 43, baffle 241 can guide the wastewater passing through propeller blade 43 to rotate in the opposite direction. This further increases the stirring dimension and turbulence intensity of the wastewater in channel 24, thereby further enhancing the aggregation effect of the dispersed droplets in the final stage of aggregation. This ensures that the droplet size in the wastewater entering centrifugal extraction mechanism 1 is maximized, creating optimal conditions for the final efficient centrifugal separation.

[0050] Subsequently, wastewater enters the wastewater phase inlet of the centrifugal extraction unit 1 through the connecting pipe 11, while extractant is simultaneously introduced into the extractant phase inlet of the centrifugal extraction unit 1. This allows the centrifugal extraction unit 1 to mix the wastewater and extractant. At this point, target substances such as phenols in the wastewater are rapidly transferred to the extractant. The denser wastewater phase is then thrown to the outer edge, while the less dense extractant phase is pushed towards the center. Meanwhile, the large droplets aggregated in the wastewater are cleanly and efficiently separated by the centrifugal extraction unit 1, clearly heading to their respective outlets. For example, oily droplets are separated to the extractant phase outlet, while those containing solid flocs are separated to the wastewater phase outlet. This prevents the two phases from being entrained, allowing the two liquid phases to be continuously discharged along different paths, thereby completing the recovery of target substances such as phenols from the wastewater.

[0051] It should be noted that the structures and parts located inside the treatment tank 2, that is, in contact with the wastewater, in this invention are all made of corrosion-resistant materials.

[0052] Although this invention increases costs by adding components such as a processing tank 2, shear turbine 4, shear turbine 41, propeller blade 42, and propeller blade 43 to a traditional centrifugal extractor, it achieves progressive fragmentation and aggregation of emulsion droplets in wastewater through the synergistic design of multi-stage flow channels and differentiated stirring, significantly improving the demulsification and separation effect. It is expected to aggregate the average particle size of emulsion droplets in wastewater from less than 10 μm to greater than 100 μm. Simultaneously, by utilizing mechanical methods to fragment and aggregate the droplets, the use of demulsifiers in traditional methods is reduced, coupled with closed-loop control for precise separation. The pre-dosing system reduces the amount of demulsifier used by 30% to 50% in a single application, significantly reducing the use and residue of chemical agents while ensuring demulsification efficiency, thus lowering the load on subsequent treatment and the risk of secondary pollution. Ultimately, it makes the pretreated wastewater more suitable for centrifugal extraction, improving the recovery rate and purity of phenolic substances, and reducing equipment blockage and maintenance frequency. From a long-term operational perspective, this invention balances and exceeds the initial investment by improving treatment efficiency, saving chemical consumption, enhancing resource recovery, and reducing operation and maintenance costs, demonstrating good economic and environmental benefits.

[0053] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element 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 this invention.

[0054] Furthermore, the terms "first," "second," "number one," and "number two" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," "number one," or "number two" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0055] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0056] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. An automatic treatment device for salicylic acid production wastewater, comprising a centrifugal extraction mechanism for separating and recovering phenolic substances from the wastewater, characterized in that, It also includes a treatment tank for demulsifying and separating high-salt substances in wastewater. The outlet at the bottom of the treatment tank is connected to the wastewater inlet of the centrifugal extraction mechanism via a connecting pipe. The inner cavity of the processing tank is divided into four channels from top to bottom: channel one, channel two, channel three, and channel four. Each of these channels consists of a wide upper section for breaking up emulsion droplets and a narrow lower section for coalescing emulsion droplets. The processing tank is equipped with a drive assembly consisting of a shear turbine 1 and a shear turbine 2 for gradient weakening shearing and breaking up emulsion droplets, and a propeller blade 1 and a propeller blade 2 for gradient decaying stirring and agglomerating emulsion droplets. The shear turbine 1 is located inside the first wide zone of the flow channel, the shear turbine 2 is located inside the second wide zone of the flow channel, the propeller blade 1 is located inside the third wide zone of the flow channel, and the propeller blade 2 is located inside the fourth wide zone of the flow channel. The treatment tank is equipped with dosing pipes at equal intervals along the vertical direction, and the dosing pipes are equipped with dosing components that add precisely measured demulsifier to the wastewater; The wastewater inside the treatment tank flows from top to bottom, achieving a sequential synergistic effect of powerful crushing, gentle agglomeration, and chemical demulsification. This promotes the formation of larger, easily separable, and stable droplets from tiny droplets, thereby enabling the centrifugal extraction mechanism to separate the extractant phase and the wastewater phase with high quality.

2. The automatic treatment device for salicylic acid production wastewater according to claim 1, characterized in that, The cross-sectional area of ​​the wide sections on the first, second, third, and fourth flow channels decreases sequentially, as does the cross-sectional area of ​​the narrow sections on the first, second, third, and fourth flow channels, thereby gradually agglomerating the emulsion droplets in the wastewater flowing from top to bottom.

3. The automatic treatment device for salicylic acid production wastewater according to claim 1, characterized in that, The number of blades and the tilt angle of the first shear turbine are both greater than those of the second shear turbine, which makes the first shear turbine break up the emulsion droplets more quickly than the second shear turbine when treating wastewater.

4. The automatic treatment device for salicylic acid production wastewater according to claim 1, characterized in that, The number of blades in the first and second propeller blades decreases sequentially, and the edges of the blades in both the first and second propeller blades are non-sharp arc-shaped structures.

5. The automatic treatment device for salicylic acid production wastewater according to claim 1, characterized in that, The drive assembly includes a drive shaft and a non-powered shaft that are rotatably positioned at the axis of the processing tank and distributed vertically. The drive shaft is fixedly connected to shear turbine one, shear turbine two and propulsion blade one, and the non-powered shaft is fixedly connected to propulsion blade two.

6. The automatic treatment device for salicylic acid production wastewater according to claim 5, characterized in that, The centrifugal extraction mechanism includes a synchronous motor located at the top for providing centrifugal force, and the output shaft of the synchronous motor is connected to the upper side of the drive shaft via a belt.

7. An automatic treatment device for salicylic acid production wastewater according to claim 1, characterized in that, The drug injection assembly includes flow valves fixedly connected to the drug injection pipe, with the two upper flow valves and the two lower flow valves each connected to a drug supply pipeline.

8. The automatic treatment device for salicylic acid production wastewater according to claim 1, characterized in that, The upper front side of the treatment tank is provided with a feeding pipe that connects to its inner cavity. The feeding pipe is used to introduce salicylic acid production wastewater into the treatment tank.

9. An automatic treatment device for salicylic acid production wastewater according to claim 1, characterized in that, Several turbulence plates are fixedly arranged at equal intervals along the circumference of the inner wall of the wide area of ​​the flow channel four. The turbulence plates weaken the kinetic energy of the wastewater and promote the collision and aggregation of tiny droplets.

10. An automatic treatment device for salicylic acid production wastewater according to claim 9, characterized in that, The spoiler has a vortex-like structure, and the spiral direction of the spoiler is opposite to the rotation direction of the second propeller blade.

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