An oil-water separation system

Abstract

This invention provides an oil-water separation system, comprising: a feed tank, an oil-water separation circuit, an oil phase collection tank, a water phase collection tank, and a feed pump for the separation device. The feed tank is connected to the oil-water separation circuit, and the feed pump is installed in the connecting pipe between the feed tank and the oil-water separation circuit. The oil-water separation circuit is connected to both the oil phase collection tank and the water phase collection tank. The oil-water separation circuit consists of multiple oil-water separation devices of different levels, each containing an oil-water separation filter element of corresponding precision. This invention provides an oil-water separation circuit composed of oil-water separation devices of different levels constructed from oil-water separation filter elements of varying precision. It can quickly separate oil and water by maintaining the oil phase, i.e., near the melting point of o-nitroaniline; thus saving significant energy consumption and operating at a much lower temperature.

Description

Technical Field

[0001] This utility model relates to the field of high-temperature oil-water separation technology, and in particular to an oil-water separation system. Background Technology

[0002] o-Nitroaniline has a melting point of 73°C. It is an organic compound mainly used as an intermediate in organic synthesis and is a raw material for the production of dyes, rubber antioxidants, and the pesticide carbendazim. It should be stored in a cool, ventilated warehouse, away from fire and heat sources, and sealed in packaging.

[0003] The production of o-nitroaniline generates ammonium chloride, which needs to be removed by water washing. During the washing process, an emulsion layer of o-nitroaniline oil and water phases is produced, with the oil phase comprising approximately 70%, making separation of the oil and water phases difficult. Furthermore, if the temperature of the emulsion layer in the o-nitroaniline washing process drops below the melting point of o-nitroaniline, the emulsion layer solidifies, further hindering the separation of the oil and water phases. The original process used distillation for separation, a process that consumed a significant amount of energy. Utility Model Content

[0004] In view of this, the present invention provides an oil-water separation system to solve the problem that the existing process in the prior art uses distillation for separation, which consumes a lot of energy.

[0005] To achieve the above objectives, the present invention provides the following technical solutions:

[0006] This utility model embodiment illustrates an oil-water separation system, the oil-water separation system comprising:

[0007] Feed tank, oil-water separation circuit, oil phase collection tank, water phase collection tank, and feed pump for the separation device;

[0008] The feed box is connected to the oil-water separation circuit, and a separation device feed pump is installed in the connecting pipe between the feed box and the oil-water separation circuit.

[0009] The oil-water separation circuit is connected to the oil phase collection tank and the water phase collection tank respectively. The oil-water separation circuit is composed of multiple oil-water separation devices of different levels, and each oil-water separation device is equipped with an oil-water separation filter element of corresponding precision.

[0010] The feed box detects the volume of the liquid to be treated flowing in. When it is determined that the volume of the liquid to be treated reaches a preset threshold, the feed pump of the separation device is triggered to start, so that the liquid to be treated flows to the oil-water separation circuit.

[0011] The oil-water separation filter element with corresponding precision in the oil-water separation circuit filters the liquid to be treated, thereby separating the water phase and the oil phase in the liquid to be treated;

[0012] The aqueous phase in the liquid to be treated flows to the aqueous phase collection tank, and the oil phase in the liquid to be treated flows to the oil phase collection tank.

[0013] Optionally, the feed tank includes a feed valve and a level gauge;

[0014] The feed valve is located at the inlet of the feed pipe above the feed box;

[0015] The level gauge is inserted through the top of the feed tank body to be installed inside the feed tank.

[0016] Optionally, a heating device and a first temperature sensor are provided at the bottom of the feed box;

[0017] The first temperature sensor is used to detect the temperature of the liquid to be processed in the feed tank;

[0018] The heating device is used to heat the liquid to be treated until the temperature of the liquid to be treated reaches a preset temperature range.

[0019] Optionally, the feed hopper is also equipped with a stirring device for stirring the liquid to be treated.

[0020] Optionally, a gas recovery box may also be included;

[0021] The gas recovery box is connected to the side opening of the feed pipe above the feed box, and is used to absorb the organic vapor generated after the liquid to be treated is heated.

[0022] Optionally, the oil-water separation circuit includes a primary oil-water separation device, a secondary oil-water separation device, and a tertiary oil-water separation device;

[0023] The primary oil-water separator, the secondary oil-water separator, and the tertiary oil-water separator are connected in series to form an oil-water separation circuit;

[0024] If the number of oil-water separation circuits is N, all levels of oil-water separation devices in the (N-1)th oil-water separation circuit are connected to the first-level oil-water separation device of the Nth oil-water separation circuit through pipelines, where N is a positive integer greater than or equal to 2;

[0025] One end of the primary oil-water separation device of the first oil-water separation circuit is connected to the feed box through a connecting pipe, and a separation device feed pump is installed in the connecting pipe.

[0026] One end of the three-stage oil-water separation device in the first oil-water separation circuit is connected to the oil phase collection tank via a pipeline.

[0027] One end of the three-stage oil-water separation device in the Nth oil-water separation circuit is connected to the water phase collection tank via a pipeline.

[0028] Optionally, all levels of oil-water separation devices in the Nth oil-water separation circuit are connected to the feed pipe above the feed box via pipelines.

[0029] Optionally, when N is greater than or equal to 3, one end of the three-stage oil-water separation device of the N-1th oil-water separation loop is connected to the oil phase collection tank through a pipeline.

[0030] All levels of oil-water separators in the N-2 oil-water separation loop are connected to the inlet of the first-stage oil-water separator in the N-1 oil-water separation loop via pipelines.

[0031] All levels of oil-water separators in the (N-1)th oil-water separation loop are connected to the inlet of the first-stage oil-water separator in the Nth oil-water separation loop via pipelines.

[0032] Optionally, each of the primary, secondary, and tertiary oil-water separation devices in each oil-water separation circuit is equipped with a second temperature sensor.

[0033] Optionally, butterfly valves and check valves are installed on the pipelines connecting all levels of oil-water separation devices in the (N-1)th oil-water separation loop to the first-level oil-water separation device in the Nth oil-water separation loop.

[0034] An oil-water separation system based on the above-described embodiment of the present invention includes: a feed tank, an oil-water separation circuit, an oil phase collection tank, a water phase collection tank, and a separation device feed pump; the feed tank is connected to the oil-water separation circuit, and a separation device feed pump is installed in the connecting pipe between the feed tank and the oil-water separation circuit; the oil-water separation circuit is connected to the oil phase collection tank and the water phase collection tank respectively, wherein the oil-water separation circuit is composed of multiple oil-water separation devices of different levels, each oil-water separation device... The device is equipped with oil-water separation filter elements of corresponding precision. The feed tank detects the volume of the incoming liquid to be treated. When the volume of the liquid to be treated reaches a preset threshold, the feed pump of the separation device is triggered to start, causing the liquid to flow into the oil-water separation circuit. The oil-water separation filter elements of corresponding precision in the oil-water separation circuit filter the liquid to be treated, separating the aqueous and oil phases. The aqueous phase flows to the aqueous phase collection tank, and the oil phase flows to the oil phase collection tank. This invention provides an oil-water separation circuit composed of oil-water separation filter elements of different precisions, which can quickly separate oil and water by maintaining the oil phase, i.e., near the melting point of o-nitroaniline. This saves a significant amount of energy and operates at a much lower temperature. Attached Figure Description

[0035] 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 embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0036] Figure 1 This is a schematic diagram of the structure of an oil-water separation system according to an embodiment of the present invention;

[0037] Figure 2 This is a schematic diagram of another oil-water separation system shown in an embodiment of the present invention;

[0038] Figure 3 This is a schematic diagram of the structure of another oil-water separation system shown in an embodiment of the present invention;

[0039] Figure 4 This is a schematic diagram of another oil-water separation system shown in an embodiment of the present invention. Detailed Implementation

[0040] 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.

[0041] It should be noted that the descriptions involving "first," "second," etc., in this utility model 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 as "first" or "second" may explicitly or implicitly include at least one of that feature. 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 protection scope claimed by this utility model.

[0042] In this application, the terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0043] See Figure 1 This is a schematic diagram of an oil-water separation system according to an embodiment of the present invention. The system includes:

[0044] 1. Feed tank, 2. Oil-water separation circuit, 3. Oil phase collection tank, 4. Water phase collection tank, and 5. Feed pump for separation device;

[0045] The feed box 1 is connected to the oil-water separation circuit 2, and a separation device feed pump 5 is installed in the connecting pipe between the feed box 1 and the oil-water separation circuit 2;

[0046] The oil-water separation circuit 2 is connected to the oil phase collection tank 3 and the water phase collection tank 4 respectively. The oil-water separation circuit 2 is composed of multiple oil-water separation devices of different levels, and each oil-water separation device is equipped with an oil-water separation filter element of corresponding precision.

[0047] The feed box 1 detects the volume of the liquid to be processed flowing through it. When it is determined that the volume of the liquid to be processed has reached a preset threshold, the feed pump 5 of the separation device is triggered to start, so that the liquid to be processed flows to the oil-water separation circuit 2.

[0048] The oil-water separation filter element with corresponding precision in the oil-water separation circuit 2 filters the liquid to be treated, so that the water phase and oil phase in the liquid to be treated are separated.

[0049] The aqueous phase in the liquid to be treated flows to the aqueous phase collection tank 4, and the oil phase in the liquid to be treated flows to the oil phase collection tank 3.

[0050] It should be noted that the preset threshold is set in advance by technicians based on the actual situation.

[0051] The liquid to be processed refers to the emulsion liquid consisting of the o-nitroaniline oil phase and the aqueous phase.

[0052] Optionally, the oil-water separation system shown in this application also illustrates a controller (not shown) connected to the various components of the oil-water separation system.

[0053] Specifically, the controller controls the feed tank 1 to detect the volume of the incoming liquid to be treated. The controller compares the detected volume of the liquid to be treated with a preset threshold. If it is determined that the detected volume of the liquid to be treated is greater than the preset threshold, the controller controls the feed pump 5 of the separation device to start, so that the liquid to be treated in the feed tank flows to the oil-water separation circuit 2.

[0054] When the liquid to be treated flows through the oil-water separation circuit 2, the oil-water separation filter material with corresponding precision in the oil-water separation circuit 2 is a super oleophilic and hydrophobic material, which allows the oil phase in the liquid to pass through and the water phase to accumulate, thereby achieving oil-water separation; at this time, the oil phase flows through the oil-water separation circuit 2 to the oil phase collection tank 3, and the accumulated water phase flows to the water phase collection tank 4.

[0055] It should be noted that the oil-water separation filter elements of different levels of oil-water separation devices have different precision. The higher the level, the higher the precision of the corresponding oil-water separation filter element. That is, the filtration precision of each level gradually increases.

[0056] In this embodiment of the invention, an oil-water separation circuit is provided, consisting of multiple oil-water separation devices of different levels. It features a high-temperature oil-water separation process, which can operate stably as long as the temperature is maintained near the melting point of the oil phase, i.e., o-nitroaniline. This can save a lot of energy and the operating temperature is relatively much lower.

[0057] Optionally, based on the oil-water separation system shown in the above embodiments of this utility model, combined with Figure 1 See Figure 2 It also shows a detailed structural diagram of the feed box.

[0058] The feed box 1 includes a feed valve 11 and a level gauge 12;

[0059] The feed valve 11 is located at the feed pipe inlet above the feed box 1;

[0060] The level gauge 12 is inserted through the top of the feed tank 1 body to be installed inside the feed tank 1;

[0061] The liquid to be processed enters the feed tank through the feed inlet of the feed tank 1. When the level gauge 12 in the feed tank 1 detects that the volume of the liquid to be processed has reached a preset threshold, it triggers the feed pump 5 of the separation device to start, so that the liquid to be processed flows to the oil-water separation circuit 2.

[0062] Specifically, the detection component of the level gauge 12 penetrates from the top of the feed tank 1 body, and the display component of the level gauge 12 is disposed outside the feed tank 1 body;

[0063] The controller is connected to the feed valve 11 and the level gauge 12 respectively;

[0064] The feed valve 11 is used to control the entry of the liquid to be processed; the level gauge 12 is used to detect the volume of the liquid to be processed in the feed tank 1 in real time.

[0065] Optionally, butterfly valves 6 are also installed before and after the feed pump 5 of the separation device to facilitate pump replacement;

[0066] Optionally, a check valve 7 is also installed on the pipeline between the feed pump 5 of the separation device and the oil-water separation circuit 2 to prevent material backflow.

[0067] In a specific implementation, the controller obtains the volume of the liquid to be processed sent by the display component of the liquid level gauge 12; and determines whether the volume of the liquid to be processed is lower than a preset threshold. If it is lower, the controller controls the feed valve 11 to open so that the emulsion liquid of the mixed o-nitroaniline oil phase and water phase in the water washing process, i.e. the liquid to be processed, flows into the feed tank 1.

[0068] If the controller determines that the volume of the liquid to be processed exceeds a preset threshold, it controls the feed pump 5 of the separation device to start, so that the liquid to be processed in the feed tank 1 flows to the oil-water separation circuit 2.

[0069] See also Figure 2 The bottom of the feed box 1 is equipped with a heating device 13 and a first temperature sensor 14;

[0070] It should be noted that the controller is connected to the heating device 13 and the first temperature sensor 14 respectively.

[0071] The first temperature sensor 14 is used to detect the temperature of the liquid to be processed in the feed tank 1;

[0072] The heating device 13 is used to heat the liquid to be treated until the temperature of the liquid to be treated reaches a preset temperature range.

[0073] Specifically, the controller acquires the temperature of the liquid to be processed detected by the first temperature sensor 14; if it is determined that the temperature is lower than the preset temperature, it controls the heating device 13 to heat the liquid to be processed until the temperature of the liquid to be processed reaches the preset temperature range.

[0074] It should be noted that the preset threshold is set by technicians through multiple experiments, for example, it can be set to 73 degrees Celsius. The preset temperature range is also set by technicians through multiple experiments, for example, it can be set to 73 degrees Celsius to 78 degrees Celsius.

[0075] Optional, see below Figure 2 The feed box 1 is also equipped with a stirring device 15 for stirring the liquid to be processed.

[0076] Specifically, when the heating device heats the feed box 1, the controller controls the stirring device 15 to start, so as to stir the liquid to be processed and stabilize the liquid to be processed.

[0077] This invention provides a high-temperature oil-water separation process. The process temperature only needs to be maintained at the melting point of the oil phase (o-nitroaniline), i.e., within a preset temperature range. A heating device and temperature sensor are installed at the bottom of the feed tank to control the temperature of the liquid to be processed between 73 and 78°C. A stirring device inside the feed tank ensures stable feeding of the oil-water separator. A level gauge is installed inside the feed tank to ensure that there is always liquid to be processed within it. This allows the temperature of the liquid to be processed to be maintained near the preset temperature range for stable operation, facilitating subsequent processing.

[0078] Optionally, based on the above embodiments of the present invention, an oil-water separation system is shown, combined with... Figure 2 See Figure 3 The oil-water separation system also includes a gas recovery tank 8.

[0079] The gas recovery box 8 is connected to the side opening of the feed pipe above the feed box 1, and is used to absorb the organic vapor generated after the liquid to be treated is heated.

[0080] See also Figure 3 The specific structure of the gas recovery box is also shown, which includes a gas discharge valve 81 and a distribution device 82.

[0081] The gas recovery box 8 is connected to the side opening of the feed pipe above the feed box 1 via a pipe at the top.

[0082] The gas recovery box 8 is equipped with a distribution device 82 for absorbing the organic vapor generated after the liquid to be treated is heated.

[0083] The top of the gas recovery box 8 is equipped with a gas discharge valve 81, which is used to discharge the absorbed gas into the atmosphere through the gas discharge valve 81.

[0084] Specifically, the distribution device 82 is equipped with gas packing material to absorb the organic vapor generated after the liquid to be treated is heated;

[0085] A gas discharge valve 82 is installed above the gas recovery box 8 to ensure that the gas adsorbed by the packing is discharged into the atmosphere while ensuring that the gas pressure in the gas recovery box is at normal pressure.

[0086] The oil-water separation system shown in this utility model also includes a gas recovery box to absorb the organic vapor generated after the liquid to be treated is heated; thereby ensuring that no waste gas is discharged into the atmosphere and pollutes the environment during the operation of the oil-water separation system.

[0087] Optionally, based on the above, this utility model discloses an oil-water separation system, combined with... Figure 3 See Figure 4 It also shows a detailed schematic diagram of the oil-water separation circuit.

[0088] The oil-water separation circuit 2 includes a primary oil-water separator 21, a secondary oil-water separator 22, and a tertiary oil-water separator 23;

[0089] It should be noted that an oil-water separation circuit 2 includes multiple oil-water separation devices of different levels, with one oil-water separation device for each level. That is, all levels of oil-water separation devices in an oil-water separation circuit 2 include a primary oil-water separation device 21, a secondary oil-water separation device 22, and a tertiary oil-water separation device 23.

[0090] The primary oil-water separator 21, the secondary oil-water separator 22, and the tertiary oil-water separator 23 are connected in series to form an oil-water separation circuit.

[0091] It should be noted that the primary oil-water separator 21, the secondary oil-water separator 22, and the tertiary oil-water separator 23 are connected in series via pipelines to form an oil-water separation loop 2.

[0092] If the number of oil-water separation circuits 2 is N, all levels of oil-water separation devices in the (N-1)th oil-water separation circuit 2 are connected to the first-level oil-water separation device 21 of the Nth oil-water separation circuit 2 through pipelines, where N is a positive integer greater than or equal to 2;

[0093] One end of the first-stage oil-water separation device 21 of the first oil-water separation circuit 2 is connected to the feed box 1 through a connecting pipe, and a separation device feed pump 5 is installed in the connecting pipe.

[0094] One end of the three-stage oil-water separation device 23 of the first oil-water separation circuit 2 is connected to the oil phase collection tank 3 via a pipeline; one end of the three-stage oil-water separation device 23 of the Nth oil-water separation circuit 2 is connected to the water phase collection tank 4 via a pipeline.

[0095] It should be noted that the controller is connected to multiple oil-water separation circuits 2 respectively.

[0096] Optionally, the oil-water separation filter element includes a super oleophilic-hydrophobic filter element and a super hydrophilic-oleophobic filter element. That is, if it is the Nth oil-water separation circuit, the oil-water separation filter element inside its primary oil-water separation device 21, secondary oil-water separation device 22 and tertiary oil-water separation device 23 is a super hydrophilic-oleophobic filter element; conversely, if it is not the Nth oil-water separation circuit 2, the oil-water separation filter element inside its primary oil-water separation device 21, secondary oil-water separation device 22 and tertiary oil-water separation device 23 is a super oleophilic-hydrophobic filter element.

[0097] Among them, the super oleophilic and hydrophobic filter element is composed of super oleophilic and hydrophobic materials, and the super hydrophilic and oleophobic filter element is composed of super hydrophilic and oleophobic materials.

[0098] It should be noted that the oil-water separation devices in the first N-1 oil-water separation loops are multi-stage oil-water separation devices, while the oil-water separation devices in the Nth oil-water separation loop are multi-stage deep oil-water separation devices. The oil-water separation devices use modified super oleophilic and hydrophobic filter elements with progressively increasing precision, allowing the oil phase to pass through while the water phase accumulates. The deep oil-water separation devices use modified super hydrophilic and oleophobic filter elements with progressively increasing precision, allowing the water phase to pass through while the oil phase accumulates. This results in excellent oil-water separation performance.

[0099] This utility model's high-temperature oil-water separation system is equipped with a gas recovery box, so there is no waste gas emission into the atmosphere, and the entire system is green and pollution-free.

[0100] Specifically, if i is not equal to n, the liquid to be processed flows through the super oleophilic and hydrophobic filter element of the corresponding precision in the first-stage oil-water separation device 21 in the i-th oil-water separation loop 2 for separation to obtain the first-stage oil phase and water phase; the oil phase obtained from the oil-water separation is transferred to the second-stage oil-water separation device 22 in the i-th oil-water separation loop 2;

[0101] Similarly, for the secondary oil-water separation device 22 in the i-th oil-water separation loop 2, the first-stage oil phase separated by the primary oil-water separation device 21 flows through the super oleophilic and hydrophobic filter element of the corresponding precision in the secondary oil-water separation device 22 for separation to obtain the second-stage oil phase and water phase; the second-stage oil phase is then transferred to the tertiary oil-water separation device 22 in the i-th oil-water separation loop 2.

[0102] Similarly, for the three-stage oil-water separation device 22 in the i-th oil-water separation loop 2, the second-stage oil phase separated by the second-stage oil-water separation device 22 flows through the super oleophilic and hydrophobic filter element with corresponding precision in the third-stage oil-water separation device 22 for separation, to obtain the third-stage oil phase and water phase; the third-stage oil phase flows to the oil phase collection tank 3.

[0103] Then, the multi-stage aqueous phases separated by the primary oil-water separator, the secondary oil-water separator, and the tertiary oil-water separator are collected and transported together through pipelines to the primary oil-water separator 21 in the (i+1)th oil-water separation loop.

[0104] It should be noted that, for the primary oil-water separator 21, the secondary oil-water separator 22, and the tertiary oil-water separator 23 in an oil-water separation circuit 2, the filter element precision of the primary oil-water separator 21 is 5~10μm; the filter element precision of the secondary oil-water separator 22 is 1~5μm; and the filter element precision of the tertiary oil-water separator 23 is 0.02~1μm.

[0105] It should be noted that i belongs to N.

[0106] Optionally, when N is greater than or equal to 3, one end of the three-stage oil-water separation device 23 of the (N-1)th oil-water separation loop 2 is connected to the oil phase collection tank 3 through a pipeline;

[0107] All levels of oil-water separation devices in the N-2th oil-water separation loop 2 are connected to the inlet of the first-stage oil-water separation device 21 of the N-1th oil-water separation loop 2 via pipelines;

[0108] All levels of oil-water separation devices in the (N-1)th oil-water separation loop 2 are connected to the inlet of the first-stage oil-water separation device 21 of the Nth oil-water separation loop 2 via pipelines.

[0109] In other words, if i+1 is not equal to N, the specific connection structure of the (i+1)th oil-water separation loop 2 is as follows:

[0110] One end of the primary oil-water separator 21 of the (i+1)th oil-water separation circuit 2 is connected to the primary oil-water separator 21, the secondary oil-water separator 22 and the tertiary oil-water separator 23 of the i-th oil-water separation circuit 2 via connecting pipes. That is, the water phase outlets of the primary oil-water separator 21, the secondary oil-water separator 22 and the tertiary oil-water separator 23 of the i-th oil-water separation circuit 2 are connected in parallel via pipes and connected to the feed inlet of the primary oil-water separator 21 of the (i+1)th oil-water separation circuit 2 through the parallel connection.

[0111] The primary oil-water separator 21, the secondary oil-water separator 22, and the tertiary oil-water separator 23 of the (i+1)th oil-water separation loop 2 are connected to the primary oil-water separator 21 in the (i+2)th oil-water separation loop via pipelines.

[0112] It should be noted that the specific implementation is the same as that of the (i+1)th oil-water separation circuit 2 and the ith oil-water separation circuit 2, and they can be referred to each other.

[0113] One end of the three-stage oil-water separation device 23 of the (i+1)th oil-water separation loop 2 is connected to the oil phase collection tank 3 via a pipeline.

[0114] The process of oil-water separation in the (i+1)th oil-water separation circuit 2 is the same as that of the i-th oil-water separation circuit 2 mentioned above, and they can be referred to each other.

[0115] Optional, see below Figure 4 All levels of oil-water separation devices in the Nth oil-water separation circuit 2 are connected to the feed pipe above the feed box 1 via pipelines.

[0116] Specifically, if i+1 equals N, the specific connection structure of the (i+1)th oil-water separation loop 2 is as follows:

[0117] One end of the primary oil-water separator 21 of the (i+1)th oil-water separation circuit 2 is connected to the primary oil-water separator 21, the secondary oil-water separator 22 and the tertiary oil-water separator 23 of the i-th oil-water separation circuit 2 via connecting pipes.

[0118] The primary oil-water separator 21, the secondary oil-water separator 22, and the tertiary oil-water separator 2 of the (i+1)th oil-water separation circuit 2 are connected to the feed box 1 through pipelines.

[0119] One end of the three-stage oil-water separation device 23 of the (i+1)th oil-water separation loop 2 is connected to the water phase collection tank 3 via a pipeline.

[0120] Specifically, if i+1 equals n, the water phase output from each level of the oil-water separation device in the i-th oil-water separation loop 2 flows through the super hydrophilic and oleophobic filter element of the corresponding precision in the first-stage oil-water separation device 21 in the i+1-th oil-water separation loop 2 for separation, to obtain the first-stage oil phase and water phase; the separated water phase is then transferred to the second-stage oil-water separation device 22 in the i+1-th oil-water separation loop.

[0121] Similarly, for the secondary oil-water separation device 22 in the (i+1)th oil-water separation loop 2, the water phase separated by the primary oil-water separation device 21 flows through the super hydrophilic oleophobic filter element of the corresponding precision in the secondary oil-water separation device 22 for separation, to obtain the second-stage oil phase and water phase; the second-stage water phase is then transferred to the tertiary oil-water separation device 23 in the i-th oil-water separation loop.

[0122] Similarly, for the three-stage oil-water separation device 23 in the i-th oil-water separation loop 2, the water phase separated by the second-stage oil-water separation device 22 flows through the super hydrophilic and oleophobic filter element with corresponding precision in the third-stage oil-water separation device 23 for separation, to obtain the third-stage oil phase and water phase; the third-stage water phase flows to the water phase collection tank 4.

[0123] Then, the oil phases collected by the primary oil-water separator 21, the secondary oil-water separator 22, and the tertiary oil-water separator 23 are transported together through pipelines to the feed box 1.

[0124] To better understand the oil-water separation circuit shown above, an example will be used for illustration below.

[0125] Assuming that the number N of the oil-water separation circuits is 2, the first-stage oil-water separator 21, the second-stage oil-water separator 22 and the third-stage oil-water separator 23 in the first oil-water separation circuit are respectively connected to the first-stage oil-water separator 21 in the second oil-water separation circuit 2 through pipelines.

[0126] One end of the first-stage oil-water separation device 21 of the first oil-water separation circuit 2 is connected to the feed box 1 through a connecting pipe, and a separation device feed pump 5 is installed in the connecting pipe.

[0127] One end of the three-stage oil-water separation device 23 of the first oil-water separation circuit 2 is connected to the oil phase collection tank 3 via a pipeline; one end of the three-stage oil-water separation device of the second oil-water separation circuit is connected to the water phase collection tank via a pipeline.

[0128] The primary oil-water separator 21, the secondary oil-water separator 22, and the tertiary oil-water separator 23 in the second oil-water separation circuit 2 are respectively connected to the feed box 21 through pipelines.

[0129] Optionally, each of the primary oil-water separator 21, secondary oil-water separator 22, and tertiary oil-water separator 23 in each oil-water separation circuit 2 is equipped with a second temperature sensor 24 and a heating and insulation device (not shown in the figure).

[0130] Specifically, the controller acquires the temperature of the corresponding level of the oil-water separator collected by the second temperature sensor 24. If it is determined that the temperature is less than the preset threshold, the controller controls the heating and heat preservation device to heat the oil-water separator until the temperature reaches the preset threshold and enters the heat preservation state to ensure that the system temperature is between 73 and 78°C, ensuring the fluidity of the liquid and thus ensuring the stable operation of the system.

[0131] Optionally, a butterfly valve 25 and a check valve 26 are installed on the pipeline connecting all levels of oil-water separation devices in the (N-1)th oil-water separation circuit 2 to the first-stage oil-water separation device 21 of the Nth oil-water separation circuit 2.

[0132] In other words, not all levels of oil-water separation devices in the Nth oil-water separation circuit 2 have butterfly valves 23 and check valves 26 installed on the water phase outlet side; all levels of oil-water separation devices in the Nth oil-water separation circuit 2 have butterfly valves 25 and check valves 26 installed on the oil phase outlet side.

[0133] The butterfly valve 25 is used to regulate the flow rate; the check valve 26 is used to prevent material backflow.

[0134] Optionally, the feed pump 27 of the N-2 oil-water separation circuit 2 is also installed on the pipeline connecting all levels of oil-water separation devices in the N-1 oil-water separation circuit 2 to the first-stage oil-water separation device 21 of the Nth oil-water separation circuit 2.

[0135] Among them, the feed pump 27 of the N-2 oil-water separation circuit 2 has the same function as the feed pump 5 of the separation device.

[0136] Optionally, all connecting pipes in the oil-water separation system are equipped with heating and insulation devices to ensure that the system temperature is within the preset temperature range, i.e., 73~78℃, to ensure the fluidity of the liquid and thus ensure the stable operation of the system.

[0137] In this embodiment of the invention, since the emulsion layer temperature of the o-nitroaniline washing process is greater than 73°C, the oil-water separation system only requires very low energy consumption to maintain the temperature of the entire system within a preset threshold range, thus enabling the system to operate stably with low energy consumption. Furthermore, the oil-water separation system disclosed in this application includes at least two oil-water separation loops. These loops primarily consist of multi-stage oil-water separation devices within the first N-1 oil-water separation loops using modified super oleophilic and hydrophobic filter elements with progressively increasing precision, allowing the oil phase to pass through while the water phase aggregates. Additionally, a multi-stage deep oil-water separation device within the Nth oil-water separation loop using modified super hydrophilic and oleophobic filter elements with progressively increasing precision allows the water phase to pass through while the oil phase aggregates. The multi-stage deep oil-water separation device and the multi-stage oil-water separation device together achieve excellent oil-water separation.

[0138] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, for system or system embodiments, since they are basically similar to method embodiments, the description is relatively simple, and relevant parts can be referred to the descriptions in the method embodiments. The systems and system embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without creative effort.

[0139] Those skilled in the art will further recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this invention.

[0140] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An oil-water separation system, characterized by, The oil-water separation system includes: Feeding box (1), oil-water separation circuit (2), oil phase collection box (3), water phase collection box (4) and separation device feed pump (5); The feed box (1) is connected to the oil-water separation circuit (2), and a separation device feed pump (5) is installed in the connecting pipe between the feed box (1) and the oil-water separation circuit (2). The oil-water separation circuit (2) is connected to the oil phase collection tank (3) and the water phase collection tank (4) respectively. The oil-water separation circuit (2) is composed of multiple oil-water separation devices of different levels, and each oil-water separation device is equipped with an oil-water separation filter element of corresponding precision. The feed box (1) detects the volume of the liquid to be treated flowing in. When it is determined that the volume of the liquid to be treated reaches the preset threshold, the feed pump (5) of the separation device is triggered to open, so that the liquid to be treated flows to the oil-water separation circuit (2). The oil-water separation filter element with corresponding precision in the oil-water separation circuit (2) filters the liquid to be treated, so that the water phase and oil phase in the liquid to be treated are separated. The aqueous phase in the liquid to be treated flows to the aqueous phase collection tank (4), and the oil phase in the liquid to be treated flows to the oil phase collection tank (3).

2. The oil-water separation system of claim 1, wherein, The feed box (1) includes a feed valve (11) and a level gauge (12); The feed valve (11) is located at the feed pipe inlet above the feed box (1); The level gauge (12) is inserted through the top of the feed box (1) body to be installed inside the feed box (1).

3. The oil-water separation system of claim 1, wherein, The bottom of the feed box (1) is equipped with a heating device (13) and a first temperature sensor (14). The first temperature sensor (14) is used to detect the temperature of the liquid to be processed in the feed tank (1); The heating device (13) is used to heat the liquid to be treated until the temperature of the liquid to be treated reaches the preset temperature range.

4. The oil-water separation system of claim 1, wherein, The feed box (1) is also equipped with a stirring device (15) for stirring the liquid to be processed.

5. The oil-water separation system of claim 1, wherein, It also includes a gas recovery box; The gas recovery box is connected to the side opening of the feed pipe above the feed box (1) to absorb the organic vapor generated after the liquid to be treated is heated.

6. The oil-water separation system of claim 1, wherein, The oil-water separation circuit (2) includes a primary oil-water separation device (21), a secondary oil-water separation device (22), and a tertiary oil-water separation device (23). The primary oil-water separator (21), the secondary oil-water separator (22), and the tertiary oil-water separator (23) are connected in series to form an oil-water separation circuit (2). If the number of oil-water separation circuits (2) is N, all levels of oil-water separation devices in the (N-1)th oil-water separation circuit (2) are connected to the first-level oil-water separation device (21) of the Nth oil-water separation circuit through pipelines, where N is a positive integer greater than or equal to 2; One end of the first-stage oil-water separation device (21) of the first oil-water separation circuit (2) is connected to the feed box (1) through a connecting pipe, and a separation device feed pump (5) is installed in the connecting pipe. One end of the three-stage oil-water separation device (23) of the first oil-water separation circuit (2) is connected to the oil phase collection tank (3) through a pipeline; One end of the three-stage oil-water separation device (23) of the Nth oil-water separation circuit (2) is connected to the water phase collection tank (4) through a pipeline.

7. The oil-water separation system of claim 6, wherein, All levels of oil-water separation devices in the Nth oil-water separation circuit (2) are connected to the feed pipe above the feed box (1) via pipelines.

8. The oil-water separation system of claim 6, wherein, When N is greater than or equal to 3, one end of the three-stage oil-water separation device (23) of the N-1th oil-water separation loop (2) is connected to the oil phase collection tank (3) through a pipeline. All levels of oil-water separation devices in the N-2th oil-water separation loop (2) are connected to the feed inlet of the first-stage oil-water separation device (21) of the N-1th oil-water separation loop (2) through pipelines; All levels of oil-water separation devices in the N-1th oil-water separation loop (2) are connected to the feed inlet of the first-level oil-water separation device (21) of the Nth oil-water separation loop via pipelines.

9. The oil-water separation system of claim 6, wherein, Each oil-water separation circuit (2) is equipped with a second temperature sensor (24) for the first-stage oil-water separation device (21), the second-stage oil-water separation device (22), and the third-stage oil-water separation device (23).

10. The oil-water separation system of claim 6, wherein, Butterfly valves (25) and check valves (26) are installed on the pipelines connecting all levels of oil-water separation devices in the N-1 oil-water separation loop (2) to the first-level oil-water separation device (21) of the Nth oil-water separation loop (2).

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