Gravity-driven oil-water automatic separator and preparation method thereof

Abstract

The application belongs to the field of high polymer materials, and discloses a gravity-driven oil-water automatic separator and a preparation method thereof. The oil-water automatic separator comprises a hydrophilic filter part and a hydrophobic filter part. The hydrophilic filter part comprises a hydrophilic body, a hydrophilic fitting part and a plurality of first filter holes; the hydrophobic filter part comprises a hydrophobic body, a hydrophobic fitting part and a plurality of second filter holes; and the hydrophilic fitting part and the hydrophobic fitting part are mutually fitted to form a fitting area. The preparation method of the oil-water automatic separator is simple, and solves the problem that the traditional oil-water separation can only obtain oil or water, and cannot simultaneously separate oil and water. The application lays a foundation for the treatment of industrial oil-containing wastewater.

Description

Technical Field

[0001] This invention belongs to the field of polymer materials, and particularly relates to a gravity-driven automatic oil-water separator and its preparation method. Background Technology

[0002] Marine oil spills occur frequently, generating large amounts of oily wastewater that have a significant impact on the environment. In addition, the improper discharge of domestic sewage and industrial oily wastewater also seriously affects ecological security.

[0003] Therefore, exploring solutions for oil separation and recovery is urgently needed. In recent years, various oil-water separation technologies have been developed, including the adsorption of thin oil phases by porous materials such as particles and fibers, and the large-scale separation of oil-water mixtures by two-dimensional and three-dimensional membrane materials. However, these materials are either hydrophilic to recover water or hydrophobic to recover oil, and cannot simultaneously separate and recover oil and water, resulting in resource waste.

[0004] In view of this, it is indeed necessary to develop an automatic oil-water separation device and its preparation method that can simultaneously and automatically separate oil and water in an oil-water mixture. Summary of the Invention

[0005] In order to solve the above-mentioned existing technical problems or part thereof, the present invention aims to provide a gravity-driven automatic oil-water separator and its preparation method, wherein the automatic oil-water separator can realize automatic separation and recovery of oil and water, and can use the heat generated by sunlight to reduce the viscosity of viscous oil such as petroleum, accelerate separation, and achieve sterilization and self-cleaning effects.

[0006] According to one aspect of the present invention, a gravity-driven automatic oil-water separator is provided, the automatic oil-water separator comprising:

[0007] The hydrophilic filter section includes a hydrophilic body, a hydrophilic fitting portion disposed on one side of the hydrophilic body, and a plurality of first filter holes penetrating the hydrophilic body and the hydrophilic fitting portion along the direction of gravity.

[0008] The hydrophobic filter section includes a hydrophobic body, a hydrophobic fitting portion disposed on one side of the hydrophobic body, and a plurality of second filter holes penetrating the hydrophobic body and the hydrophobic fitting portion along the direction of gravity.

[0009] The hydrophilic and hydrophobic interlocking portions interlock to form an interlocking region.

[0010] Furthermore, the top surface of the hydrophilic filter section is inclined toward the center of the interlocking area, and the top surface of the hydrophobic filter section is also inclined toward the center of the interlocking area.

[0011] Furthermore, the hydrophilic interlocking portion is configured as a hydrophilic serrated structure, and the hydrophobic interlocking portion is configured as a hydrophobic serrated structure, wherein the hydrophilic serrated structure and the hydrophobic serrated structure can interlock with each other.

[0012] Furthermore, the hydrophilic serrated structure includes at least one hydrophilic serrated portion, and the hydrophobic serrated structure includes at least one hydrophobic serrated portion.

[0013] Furthermore, the top surface of the hydrophilic body and the top surface of the first hydrophilic serrated portion form the top surface of the hydrophilic filter portion on the same plane; the top surface of the hydrophobic body and the top surface of the first hydrophobic serrated portion form the top surface of the hydrophobic filter portion on the same plane; the top surfaces of the hydrophilic filter portion and the top surfaces of the hydrophobic filter portion are partially staggered.

[0014] Furthermore, in the gravity-driven automatic oil-water separator, in the interlocking zone, the hydrophilic and hydrophobic interlocking portions form gaps along the interlocking edges that allow the separated oil or water in the oil-water mixture to flow through. The oil-water mixture flowing over the hydrophilic filter is separated into water and oil by gravity. A portion of the water flows out of the hydrophilic body through the first filter hole, and the remaining water flows along the first filter hole in the hydrophilic interlocking portion to the gap and continues to flow along the gap, then exits the hydrophilic interlocking portion from top to bottom through the first filter hole. The oil flows along the top surface of the hydrophilic filter towards the interlocking zone and flows out of the hydrophobic filter through the gap and via the second filter hole in the hydrophobic interlocking portion of the interlocking zone, or through the interlocking portion... After the second filter hole on the interlocking area flows downward to the gap, it continues to flow along the gap and flows out from the hydrophobic interlocking part by means of the second filter hole in the hydrophobic interlocking part of the interlocking area; after the oil-water mixture flowing on the hydrophobic filter part is separated by gravity, the oil in the oil-water mixture flows along the second filter hole of the hydrophobic body and along the second filter hole in the hydrophobic interlocking part to the gap, continues to flow along the gap and leaves the hydrophobic filter part from top to bottom through the second filter hole in the interlocking area, and the water in the oil-water mixture flows towards the interlocking area along the hydrophobic filter part, and flows downward to the gap through the first filter hole on the surface of the gap or the hydrophilic filter part, continues to flow along the gap and flows out from the hydrophilic filter part by means of the first filter hole in the hydrophilic interlocking part of the interlocking area.

[0015] Furthermore, the hydrophilic filter section includes a first hollow section located below the hydrophilic serrated structure, and the hydrophobic filter section includes a second hollow section located below the hydrophobic serrated structure, wherein the first hollow section and the second hollow section constitute a hollow cavity.

[0016] Furthermore, the hollow cavity is provided with a support member for supporting the hydrophilic filter section and the hydrophobic filter section.

[0017] Furthermore, the hydrophilic filter section has a hydrophilic surface obtained by surface deposition of polypyrrole / silver; the hydrophobic filter section has a hydrophobic surface obtained by surface deposition of polypyrrole / silver / dodecyl mercaptan.

[0018] According to a second aspect of the present invention, the present invention provides a method for preparing the above-mentioned gravity-driven automatic oil-water separator, comprising the following steps:

[0019] S1. Using 3D printing technology to print hydrophilic filter matrix and hydrophobic filter matrix;

[0020] S2. The hydrophilic filter substrate is subjected to alkali treatment, mixed solution treatment with pyrrole and FeCl3, silver ammonia solution treatment and glucose treatment in sequence to obtain a hydrophilic filter; the hydrophobic filter substrate is subjected to alkali treatment, mixed solution treatment with pyrrole and FeCl3, silver ammonia solution treatment, glucose treatment and alcohol-water solution treatment with dodecyl mercaptan in sequence to obtain a hydrophobic filter.

[0021] S3. The hydrophilic filter section and the hydrophobic filter section are fitted together to form the automatic oil-water separator.

[0022] The gravity-driven automatic oil-water separator and its preparation method according to embodiments of the present invention have at least one of the following advantages, or at least a portion thereof:

[0023] (1) The gravity-driven automatic oil-water separator provided by the present invention has a design that allows the oil or water separated in the oil-water mixture to flow through by interlocking the hydrophilic interlocking part and the hydrophobic interlocking part. This design enables the automatic separation of oil-water mixture under gravity drive, that is, water is obtained on one side and oil is obtained on the other side, with high separation efficiency.

[0024] (2) The top surfaces of the hydrophilic filter section and the hydrophobic filter section of the gravity-driven automatic oil-water separator provided by the present invention are both inclined toward the center of the interlocking area and are staggered. This can better utilize gravity drive to make the oil or water in the oil-water mixture flow to the interlocking area, avoid oil covering the top surface of the hydrophilic filter section, and improve the separation efficiency.

[0025] (3) In the gravity-driven automatic oil-water separator and its preparation method provided in the embodiments of the present invention, both the hydrophilic surface and the hydrophobic surface contain PPy and silver. PPy gives the device excellent photothermal conversion performance, which can reduce the viscosity of viscous oil such as petroleum by absorbing the heat generated by sunlight and accelerate separation. Silver gives the device antibacterial properties, eliminates the growth of bacteria, and realizes the self-cleaning property of the device. The device preparation method is simple and solves the problem that traditional oil-water separation can only obtain oil or only obtain water, and cannot separate oil and water at the same time, thus laying the foundation for the treatment of industrial oily wastewater. Attached Figure Description

[0026] These and / or other aspects and advantages of the present invention will become apparent and readily understood from the following description of preferred embodiments taken in conjunction with the accompanying drawings, in which:

[0027] Figure 1 A schematic diagram of the structure of a hydrophilic filter section and a hydrophobic filter section in a gravity-driven automatic oil-water separator according to an embodiment of the present invention is shown.

[0028] Figure 2 A schematic diagram of the structure of a gravity-driven automatic oil-water separator according to an embodiment of the present invention is shown, showing the interlocking state of a hydrophilic filter section and a hydrophobic filter section.

[0029] Figure 3 A schematic diagram of an automatic oil-water separator with a support body according to another embodiment of the present invention is shown;

[0030] Figure 4 A schematic diagram of an automatic oil-water separator with a hood provided according to another embodiment of the present invention is shown;

[0031] Figure 5 A schematic diagram of an automatic oil-water separator having both a support and a shroud according to another embodiment of the present invention is shown.

[0032] Figure 6 The present invention is shown Figure 3 The diagram shows the oil-water separation principle of the automatic oil-water separator under gravity drive. Detailed Implementation

[0033] The features of the present invention are further illustrated below through specific embodiments. The following description of the embodiments of the present invention with reference to the accompanying drawings is intended to explain the overall concept of the present invention and should not be construed as a limitation thereof.

[0034] See Figure 1The diagram shows a schematic representation of the hydrophilic and hydrophobic filter sections in a gravity-driven automatic oil-water separator according to an embodiment of the present invention.

[0035] An embodiment of the present invention provides a gravity-driven automatic oil-water separator comprising two main components: a hydrophilic filter section 110 and a hydrophobic filter section 120.

[0036] Specifically, the hydrophilic filter section 110 includes a hydrophilic body 111, a hydrophilic fitting portion 112 disposed on one side of the hydrophilic body 111, and a plurality of first filter holes 113 penetrating the hydrophilic body 111 and the hydrophilic fitting portion 112 along the direction of gravity. It should be noted that those skilled in the art can set the size of the hydrophilic fitting portion 112 and the arrangement pattern of the first filter holes 113 as needed.

[0037] The hydrophobic filter section 120 includes a hydrophobic body 121, a hydrophobic fitting portion 122 disposed on one side of the hydrophobic body 121, and a plurality of second filter holes 123 penetrating the hydrophobic body 121 and the hydrophobic fitting portion 122 along the direction of gravity. It should be noted that those skilled in the art can, as needed, set the size of the hydrophobic fitting portion 122 and the arrangement pattern of the second filter holes 123. Furthermore, the first filter hole 113 can be configured to have the same arrangement pattern as the second filter holes 123, or it can be configured differently. The pore diameters of the first filter hole 113 and the second filter hole 123 can be set as needed.

[0038] In one example, the pore sizes of the first filter aperture 113 and the second filter aperture 123 are both set to 100 nm. The dimensions of the hydrophilic interlocking portion 112 and the hydrophobic interlocking portion 122 are set to exceed half the radial dimensions of their respective hydrophilic filter portions 110 and hydrophobic filter portions 120, so that they can interlock to form an interlocking region. This arrangement ensures that the resulting interlocking region occupies at least half of the entire oil-water automatic separator area, thereby achieving better filtration efficiency.

[0039] like Figure 2 As shown, the entire oil-water separator, formed by the interlocking of the hydrophilic and hydrophobic filter sections into an interlocking area, is cylindrical in shape. This interlocking area occupies more than half the diameter of the cylinder, enabling more efficient oil-water separation. Of course, the shape of the oil-water separator is not limited to this; its cross-sectional shape can be rectangular, square, elliptical, etc.

[0040] In one example, the hydrophilic interlocking portion 112 is configured as a hydrophilic serrated structure, which includes at least one hydrophilic serrated portion, as shown in the figure, and is configured as three hydrophilic serrated structures.

[0041] Similarly, the hydrophobic fitting portion 122 is configured as a hydrophobic serrated structure, which includes at least one hydrophobic serrated portion, and correspondingly, is configured as three hydrophobic serrated structures.

[0042] In one example, the top surface of the hydrophilic body 111 and the top surface of the first hydrophilic serrated portion form the top surface of the hydrophilic filter portion 110 on the same plane; the top surface of the hydrophobic body 121 and the top surface of the first hydrophobic serrated portion form the top surface of the hydrophobic filter portion 120 on the same plane. After the hydrophilic serrated structure of the hydrophilic fitting portion 112 and the hydrophobic serrated structure of the hydrophobic fitting portion 122 are fitted together, the top surfaces of the hydrophilic filter portion 110 and the hydrophobic filter portion 120 are both inclined towards the center of the fitting area and partially interlocked.

[0043] In the interlocking region, the hydrophilic interlocking portion 112 and the hydrophobic interlocking portion 122 form gaps along their interlocking edges, allowing the separated oil or water in the oil-water mixture to flow through. Specifically, the length of the first hydrophobic serrated portion of the hydrophobic interlocking portion 122 is shorter than the length of the remaining hydrophobic serrated portions. The top surface of the portion of the first hydrophilic serrated portion of the hydrophilic interlocking portion 112 near the tooth tip forms a first gap with the bottom surface of the first hydrophobic serrated portion of the hydrophobic interlocking portion 122. The bottom surface of the first hydrophilic serrated portion of the hydrophilic interlocking portion 112 forms a second gap with the top surface of the second hydrophobic serrated portion of the hydrophobic interlocking portion 122. The top surface of the second hydrophilic serrated portion of the hydrophilic interlocking portion 112 forms a third gap with the bottom surface of the second hydrophobic serrated portion of the hydrophobic interlocking portion 122. The bottom surface of the second hydrophilic serrated portion of the hydrophilic mating portion 112 and the top surface of the third hydrophobic serrated portion of the hydrophobic mating portion 122 form a fourth slit. The top surface of the third hydrophilic serrated portion of the hydrophilic mating portion 112 and the bottom surface of the third hydrophobic serrated portion of the hydrophobic mating portion 122 form a fifth slit. The first to fifth slits form channels that allow liquid flow.

[0044] In one example, in the interlocking region, the first hydrophilic serrated portion is located above the first hydrophobic serrated portion, and the edges (top or bottom surfaces) of each hydrophilic serrated portion and each hydrophobic serrated portion sequentially form the first to fifth gaps.

[0045] In one example, there is a hollow cavity below the interlocking region.

[0046] like Figure 3As shown, in one example, the automatic oil-water separator includes a support portion 140 disposed within a hollow cavity for supporting a hydrophilic filter portion 110 and a hydrophobic filter portion 120. The top surface of the support portion 130 forms a sixth slit with the bottom surface of a third hydrophilic serrated portion. The design of the support portion 140 prevents the filtered oil and water from mixing again.

[0047] like Figure 4 As shown, in one example, the automatic oil-water separator includes a cover 130. The cover 130 is fitted around the periphery of the integral structure formed by the interlocking of the hydrophilic filter section 110 and the hydrophobic filter section 120, to prevent the hydrophilic filter section 110 from separating from the hydrophobic interlocking section 120. Preferably, the height of the cover 130 is higher than the integral structure formed by the interlocking of the hydrophilic filter section 110 and the hydrophobic filter section 120, which can prevent the oil-water mixture from flowing out from the top surface of the hydrophilic filter section 110 and the hydrophobic filter section 120, making operation more convenient.

[0048] like Figure 5 As shown, in one example, the automatic oil-water separator includes a shroud 130 and a support 140.

[0049] The working principle of the automatic oil-water separator provided in this embodiment of the invention for oil-water separation under gravity drive is as follows: Figure 6 As shown.

[0050] The oil-water mixture flowing through the hydrophilic filter section 110 is separated into water and oil by gravity. Part of the water flows out of the hydrophilic body 111 along the first filter hole 113. The remaining water flows along the first filter hole 113 in the hydrophilic interlocking section 112 to the gap and continues to flow along the gap, and then flows out of the hydrophilic interlocking section 112 from top to bottom along the first filter hole 113. The oil flows along the top surface of the hydrophilic filter section 110 toward the interlocking area, and flows out of the hydrophobic filter section 120 through the gap and by means of the second filter hole 123 in the hydrophobic interlocking section 122 in the interlocking area. The oil-water mixture flowing through the hydrophobic filter section 120 is separated into water and oil by gravity. A portion of the oil flows out of the hydrophobic body 121 along the second filter hole 123. The remaining portion of the oil flows along the second filter hole 123 in the hydrophobic fitting section 122 to the gap and continues to flow along the gap. Then it flows out of the hydrophobic fitting section 122 from top to bottom along the second filter hole 123. The water flows along the top surface of the hydrophobic filter section 120 toward the fitting area and flows out of the hydrophilic filter section through the gap and by means of the first filter hole 113 in the hydrophilic fitting section 112 in the fitting area.

[0051] Specifically, the oil-water mixture flowing through the hydrophilic filter section 110 is separated into water and oil by gravity. Part of the water flows out of the hydrophilic body 111 along the first filter hole 113. The remaining water flows along the first filter hole 113 in the hydrophilic fitting section 112 to the second gap and then continues to flow along the second gap to the third gap. Then it flows from top to bottom along the first filter hole to the fourth gap, then along the fourth gap to the fifth gap, and then flows from top to bottom along the first filter hole 113 to the hydrophilic fitting section 110 to the sixth gap. It then flows out from the side of the support 140 near the hydrophilic filter section 110 along the sixth gap.

[0052] The oil-water mixture flowing through the hydrophobic filter section 120 is separated into water and oil by gravity. Part of the oil flows out of the hydrophobic body 121 along the second filter hole 123. The remaining part of the oil flows along the second filter hole 123 in the hydrophobic fitting section 122 to the first gap and then continues to flow along the first gap to the second gap. Then it flows from top to bottom along the second filter hole 123 to the third gap and then continues to flow along the third gap to the fourth gap. While flowing in the fourth gap, the oil flows along the second filter hole 123 to the fifth gap and then flows out of the hydrophobic fitting section 120 along the fifth gap, and flows out from the side of the support 140 near the hydrophobic filter section 120.

[0053] This invention provides a method for preparing a gravity-driven automatic oil-water separator, comprising the following steps:

[0054] S1. A hydrophilic filter substrate (device a) and a hydrophobic filter substrate (device b) are obtained by printing using 3D printing technology.

[0055] In one example of the present invention, a hydrophilic filter substrate and a hydrophobic filter substrate are obtained by printing polyacrylate using DLP3D printing technology, and the pore size of the filter pores of the two substrates is 100 micrometers.

[0056] S2. The hydrophilic filter substrate is subjected to alkali treatment, mixed solution treatment with pyrrole and FeCl3, silver ammonia solution treatment and glucose treatment in sequence to obtain a hydrophilic filter; the hydrophobic filter substrate is subjected to alkali treatment, mixed solution treatment with pyrrole and FeCl3, silver ammonia solution treatment, glucose treatment and alcohol-water solution treatment with dodecyl mercaptan in sequence to obtain a hydrophobic filter.

[0057] In one example of the present invention, the alkali treatment process is as follows: the hydrophilic filter substrate and the hydrophobic filter substrate are soaked in a 5% NaOH solution for 20 minutes, then washed with deionized water and dried in an oven at 60°C.

[0058] In one example of the present invention, the mixed solution treatment process of pyrrole and FeCl3 is as follows: the alkali-treated hydrophilic filter substrate and the hydrophobic filter substrate are immersed in the mixed solution of pyrrole and FeCl3 and stored in a refrigerator (4°C) for 24 hours. The concentration of pyrrole in the mixed solution is 1 g / L-5 g / L, and the concentration of FeCl3 is 0.2 g / L-1 g / L. Then, they are taken out and rinsed with deionized water to obtain hydrophilic and hydrophobic filter substrates coated with polypyrrole.

[0059] In one example of the present invention, the silver ammonia solution treatment process is as follows: the hydrophilic filter substrate and the hydrophobic filter substrate coated with polypyrrole are immersed in the silver ammonia solution for 20 minutes for treatment, and then a glucose solution with a concentration of 2-10 g / L is added and reacted for 2 hours, wherein the concentration of silver nitrate added to the silver ammonia solution is 1-5 g / L.

[0060] In one example of the present invention, the process of treating the aqueous solution of dodecyl mercaptan is as follows: the hydrophobic filter substrate after being treated with silver ammonia solution is immersed in an aqueous solution of dodecyl mercaptan with a concentration of 1g / L-5g / L to obtain the hydrophobic filter.

[0061] Example 1

[0062] (1) Using DLP3D printing technology, polyacrylate was printed to obtain two-part filter substrate devices a and b that could fit together. The printed pore size of devices a and b was 100 micrometers. Devices a and b were then soaked in a 5% NaOH solution for 20 minutes, washed with deionized water, and dried in an oven at 60°C.

[0063] (2) Perform hydrophilic treatment on device a after alkali treatment. The specific method is as follows: Immerse device a in a mixed solution of pyrrole and FeCl3 and store in a refrigerator (4℃) for 24 hours. The concentration of pyrrole in the mixed solution is 1 g / L, and the concentration of FeCl3 is 0.2 g / L. Then take it out, rinse with deionized water, and then immerse the polypyrrole-coated device a in a silver ammonia solution for 20 min. After that, add glucose solution and react for 2 h. The concentration of silver nitrate added to the silver ammonia solution is 1-5 g / L, and the concentration of glucose is 2-10 g / L. Then take it out, rinse with deionized water, and dry in an oven at 60℃ for later use.

[0064] (3) Water treatment was performed on device b after alkali treatment. The specific method was as follows: the treated device b was immersed in a mixed solution of pyrrole and FeCl3 and stored in a refrigerator (4℃) for 24 hours. The concentration of pyrrole in the mixed solution was 1 g / L and the concentration of FeCl3 was 0.2 g / L. Then it was taken out, rinsed with deionized water, and then the polypyrrole-plated device b was immersed in a silver ammonia solution for 20 min. After that, a glucose solution was added and reacted for 2 h. The concentration of silver nitrate added to the silver ammonia solution was 2 g / L and the concentration of glucose was 4 g / L. Then it was taken out, rinsed with deionized water, and dried in an oven at 60℃. The dried device b was immersed in a 1 g / L HS alcohol-water solution with a mass ratio of ethanol to water of 1:1. After immersion at room temperature for 24 hours, it was washed with ethanol and deionized water in sequence and dried in an oven at 60℃ for later use.

[0065] (4) When separating oil and water, the prepared device a and device b are put together for use.

[0066] Example 2

[0067] (1) Using DLP3D printing technology, polyacrylate was printed to obtain two-part filter substrate devices a and b that could fit together. The printed pore size of devices a and b was 100 micrometers. Devices a and b were then soaked in a 5% NaOH solution for 20 minutes, washed with deionized water, and dried in an oven at 60°C.

[0068] (2) Perform hydrophilic treatment on device a after alkali treatment. The specific method is as follows: Immerse device a in a mixed solution of pyrrole and FeCl3 in a refrigerator (4℃) for 24 hours. The concentration of pyrrole in the mixed solution is 5 g / L, and the concentration of FeCl3 is 1 g / L. Then remove it, rinse with deionized water, and then immerse the polypyrrole-coated device a in a silver ammonia solution for 20 min. After that, add glucose solution and react for 2 h. The concentration of silver nitrate added to the silver ammonia solution is 2 g / L, and the concentration of glucose is 4 g / L. Then remove it, rinse with deionized water, and dry in an oven at 60℃ for later use.

[0069] (3) Water treatment was performed on device b after alkali treatment. The specific method was as follows: device b was immersed in a mixed solution of pyrrole and FeCl3 and stored in a refrigerator (4℃) for 24 hours. The concentration of pyrrole in the mixed solution was 5 g / L and the concentration of FeCl3 was 1 g / L. Then it was taken out and rinsed with deionized water. Subsequently, device b coated with polypyrrole was immersed in silver ammonia solution for 20 min, and then glucose solution was added and reacted for 2 h. The concentration of silver nitrate added to the silver ammonia solution was 1-5 g / L and the concentration of glucose was 2-10 g / L. Then it was taken out, rinsed with deionized water, and dried in an oven at 60℃. After drying, device b was immersed in a 5 g / L HS alcohol-water solution with a mass ratio of ethanol to water of 1:1. After immersion at room temperature for 24 hours, it was washed with ethanol and deionized water in sequence and dried in an oven at 60℃ for later use.

[0070] (4) When separating oil and water, the prepared device a and device b are put together for use.

[0071] Example 3

[0072] (1) Using DLP3D printing technology, polyacrylate was printed to obtain two-part filter substrate devices a and b that could fit together. The printed pore size of devices a and b was 100 micrometers. Devices a and b were then soaked in a 5% NaOH solution for 20 minutes, washed with deionized water, and dried in an oven at 60°C.

[0073] (2) Perform hydrophilic treatment on device a after alkali treatment. The specific method is as follows: Immerse device a in a mixed solution of pyrrole and FeCl3 in a refrigerator (4℃) for 24 hours. The concentration of pyrrole in the mixed solution is 5 g / L, and the concentration of FeCl3 is 1 g / L. Then remove it, rinse with deionized water, and then immerse the polypyrrole-coated device a in a silver ammonia solution for 20 min. After that, add glucose solution and react for 2 h. The concentration of silver nitrate added to the silver ammonia solution is 1-5 g / L, and the concentration of glucose is 2-10 g / L. Then remove it, rinse with deionized water, and dry in an oven at 60℃ for later use.

[0074] (3) Water treatment was performed on device b after alkali treatment. The specific method was as follows: device b was immersed in a mixed solution of pyrrole and FeCl3 and stored in a refrigerator (4℃) for 24 hours. The concentration of pyrrole in the mixed solution was 5 g / L and the concentration of FeCl3 was 1 g / L. Then it was taken out, rinsed with deionized water, and then device b coated with polypyrrole was immersed in silver ammonia solution for 20 min. After that, glucose solution was added and reacted for 2 h. The concentration of silver nitrate added to the silver ammonia solution was 2 g / L and the concentration of glucose was 4 g / L. Then it was taken out, rinsed with deionized water, and dried in an oven at 60℃. After drying, device b was immersed in an alcohol-water solution of 3 g / L HS, with a mass ratio of ethanol to water of 1:1. After immersion at room temperature for 24 hours, it was washed with ethanol and deionized water in sequence and dried in an oven at 60℃ for later use.

[0075] (4) When separating oil and water, the prepared device a and device b are put together for use.

[0076] Example 4

[0077] (1) Using DLP3D printing technology, polyacrylate was printed to obtain two-part filter substrate devices a and b that could fit together. The printed pore size of devices a and b was 100 micrometers. Devices a and b were then soaked in a 5% NaOH solution for 20 minutes, washed with deionized water, and dried in an oven at 60°C.

[0078] (2) Perform hydrophilic treatment on device a after alkali treatment. The specific method is as follows: Immerse device a in a mixed solution of pyrrole and FeCl3 and store in a refrigerator (4℃) for 24 hours. The concentration of pyrrole in the mixed solution is 2 g / L, and the concentration of FeCl3 is 1 g / L. Then take it out, rinse with deionized water, and then immerse the polypyrrole-coated device a in a silver ammonia solution for 20 min. After that, add glucose solution and react for 2 h. The concentration of silver nitrate added to the silver ammonia solution is 1-5 g / L, and the concentration of glucose is 2-10 g / L. Then take it out, rinse with deionized water, and dry in an oven at 60℃ for later use.

[0079] (3) Water treatment was performed on device b after alkali treatment. The specific method was as follows: device b was immersed in a mixed solution of pyrrole and FeCl3 and stored in a refrigerator (4℃) for 24 hours. The concentration of pyrrole in the mixed solution was 3 g / L and the concentration of FeCl3 was 1 g / L. Then it was taken out, rinsed with deionized water, and then the polypyrrole-plated device b was immersed in a silver ammonia solution for 20 min. After that, a glucose solution was added and reacted for 2 h. The concentration of silver nitrate added to the silver ammonia solution was 2 g / L and the concentration of glucose was 4 g / L. Then it was taken out, rinsed with deionized water, and dried in an oven at 60℃. After drying, b was immersed in a 5 g / L HS alcohol-water solution with a mass ratio of ethanol to water of 1:1. After immersion at room temperature for 24 hours, it was washed with ethanol and deionized water in sequence and dried in an oven at 60℃ for later use.

[0080] (4) When separating oil and water, the prepared device a and device b are put together for use.

[0081] Example 5

[0082] (1) Using DLP3D printing technology, polyacrylate was printed to obtain two-part filter substrate devices a and b that could fit together. The printed pore size of devices a and b was 100 micrometers. Devices a and b were then soaked in a 5% NaOH solution for 20 minutes, washed with deionized water, and dried in an oven at 60°C.

[0083] (2) Perform hydrophilic treatment on device a after alkali treatment. The specific method is as follows: Immerse device a in a mixed solution of pyrrole and FeCl3 and store in a refrigerator (4℃) for 24 hours. The concentration of pyrrole in the mixed solution is 4 g / L, and the concentration of FeCl3 is 1 g / L. Then take it out, rinse with deionized water, and then immerse the polypyrrole-coated device a in a silver ammonia solution for 20 min. After that, add glucose solution and react for 2 h. The concentration of silver nitrate added to the silver ammonia solution is 1-5 g / L, and the concentration of glucose is 2-10 g / L. Then take it out, rinse with deionized water, and dry in an oven at 60℃ for later use.

[0084] (3) Water treatment was performed on device b after alkali treatment. The specific method was as follows: device b was immersed in a mixed solution of pyrrole and FeCl3 and stored in a refrigerator (4℃) for 24 hours. The concentration of pyrrole in the mixed solution was 5 g / L, and the concentration of FeCl3 was 0.2 g / L. Then it was taken out, rinsed with deionized water, and then the polypyrrole-plated device b was immersed in a silver ammonia solution for 20 min. After that, a glucose solution was added and reacted for 2 h. The concentration of silver nitrate added to the silver ammonia solution was 2 g / L, and the concentration of glucose was 4 g / L. Then it was taken out, rinsed with deionized water, and dried in an oven at 60℃. After drying, device b was immersed in a 3 g / L HS alcohol-water solution with a mass ratio of ethanol to water of 1:1. After immersion at room temperature for 24 hours, it was washed with ethanol and deionized water in sequence and dried in an oven at 60℃ for later use.

[0085] (4) When separating oil and water, the prepared device a and device b are put together for use.

[0086] The test results of the hydrophilic / hydrophobic properties and photothermal properties of devices a and b in Examples 1-5 are shown in the table below:

[0087] Table 1. Contact angle test results of devices a and b in Examples 1-5

[0088] Example Device a (°) Device b (°) 1 0 152 2 0 158 3 0 151 4 0 150 5 0 152 Untreated PA 78 78

[0089] As shown in Table 1, after chemical treatment, device a exhibits superhydrophilicity, allowing water to pass through but not oil. Device b exhibits superhydrophobicity, preventing water from passing through but allowing oil to pass through.

[0090] Table 2. Photothermal conversion results of devices a and b in Examples 1-5 (Xenon lamp simulates one solar intensity, radiation time is 5 min).

[0091] Example Device a (°C) Device b (°C) 1 58 58 2 57 56 3 58 55 4 60 59 5 60 57 Untreated PA 42 42

[0092] As shown in Table 2, the photothermal conversion test results indicate that, compared with the untreated PA, devices a and b both exhibit excellent solar thermal conversion performance. This excellent photothermal conversion performance is helpful for the treatment and recovery of high-viscosity oil contaminants.

[0093] The gravity-driven automatic oil-water separator and its preparation method according to embodiments of the present invention have at least one of the following advantages, or at least a portion thereof:

[0094] (1) The gravity-driven automatic oil-water separator provided by the present invention has a design that allows the oil or water separated in the oil-water mixture to flow through by interlocking the hydrophilic interlocking part and the hydrophobic interlocking part. This design enables the automatic separation of oil-water mixture under gravity drive, that is, water is obtained on one side and oil is obtained on the other side, with high separation efficiency.

[0095] (2) The top surfaces of the hydrophilic filter section and the hydrophobic filter section of the gravity-driven automatic oil-water separator provided by the present invention are both inclined toward the center of the interlocking area and are staggered. This can better utilize gravity drive to make the oil or water in the oil-water mixture flow to the interlocking area, avoid oil covering the top surface of the hydrophilic filter section, and improve the separation efficiency.

[0096] (3) In the gravity-driven automatic oil-water separator and its preparation method provided in the embodiments of the present invention, both the hydrophilic surface and the hydrophobic surface contain PPy and silver. PPy gives the device excellent photothermal conversion performance, which can reduce the viscosity of viscous oil such as petroleum by absorbing the heat generated by sunlight and accelerate separation. Silver gives the device antibacterial properties, eliminates the growth of bacteria, and realizes the self-cleaning property of the device. The device preparation method is simple and solves the problem that traditional oil-water separation can only obtain oil or only obtain water, and cannot separate oil and water at the same time, thus laying the foundation for the treatment of industrial oily wastewater.

[0097] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above-described embodiments. Those skilled in the art will understand that changes can be made to these embodiments without departing from the overall concept and spirit of the present invention, and such changes should also be considered to fall within the scope of protection of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A gravity driven oil water auto separator characterized in that, The oil-water automatic separator comprises: a hydrophilic filter part comprising a hydrophilic body, a hydrophilic fitting part arranged on one side of the hydrophilic body, and a plurality of first filter holes penetrating through the hydrophilic body and the hydrophilic fitting part in the direction of gravity; a hydrophobic filter part comprising a hydrophobic body, a hydrophobic fitting part arranged on one side of the hydrophobic body, and a plurality of second filter holes penetrating through the hydrophobic body and the hydrophobic fitting part in the direction of gravity; the hydrophilic fitting part and the hydrophobic fitting part are mutually fitted to form a fitting area; in the fitting area, the hydrophilic fitting part and the hydrophobic fitting part are formed with a gap along the edges of mutual fitting, which allows the separated oil or water in the oil-water mixture to flow through; wherein the oil-water mixture flowing through the hydrophilic filter part is separated by gravity into water and oil, part of the water flows out of the hydrophilic body along the first filter holes of the hydrophilic body, the remaining part of the water continues to flow along the gap after the first filter holes in the hydrophilic fitting part reach the gap, and then flows out of the hydrophilic fitting part from top to bottom along the first filter holes, the oil flows along the top surface of the hydrophilic filter part towards the fitting area, and flows out of the hydrophobic filter part via the gap and by means of the second filter holes in the hydrophobic fitting part in the fitting area; the oil-water mixture flowing through the hydrophobic filter part is separated by gravity into water and oil, part of the oil flows out of the hydrophobic body along the second filter holes of the hydrophobic body, the remaining part of the oil continues to flow along the gap after the second filter holes in the hydrophobic fitting part reach the gap, and then flows out of the hydrophobic fitting part from top to bottom along the second filter holes, the water flows along the top surface of the hydrophobic filter part towards the fitting area, and flows out of the hydrophilic filter part via the gap and by means of the first filter holes in the hydrophilic fitting part in the fitting area.

2. The gravity-driven oil-water automatic separator according to claim 1, wherein the top surface of the hydrophilic filter part is inclined towards the center of the fitting area, the top surface of the hydrophobic filter part is also inclined towards the center of the fitting area.

3. The gravity-driven oil-water automatic separator according to claim 2, wherein the hydrophilic fitting part is arranged in a hydrophilic zigzag structure, the hydrophobic fitting part is arranged in a hydrophobic zigzag structure, wherein the hydrophilic zigzag structure and the hydrophobic zigzag structure can be mutually fitted.

4. The gravity-driven oil-water automatic separator according to claim 3, wherein the hydrophilic zigzag structure comprises at least one hydrophilic zigzag part, the hydrophobic zigzag structure comprises at least one hydrophobic zigzag part.

5. The gravity-driven oil-water automatic separator according to claim 4, wherein the top surface of the hydrophilic body and the top surface of the first hydrophilic zigzag part are in the same plane to form the top surface of the hydrophilic filter part; the top surface of the hydrophobic body and the top surface of the first hydrophobic zigzag part are in the same plane to form the top surface of the hydrophobic filter part.

6. The gravity-driven oil-water automatic separator according to claim 1, wherein The oil-water automatic separator comprises a hollow cavity below the embedded area.

7. The gravity-driven oil-water automatic separator according to claim 6, wherein, The oil-water automatic separator further comprises a support and / or a cover barrel; The support is arranged in the hollow cavity and used for supporting the hydrophilic filter part and the hydrophobic filter part; The cover barrel is sleeved on the periphery of the whole structure formed by the mutual embedding of the hydrophilic filter part and the hydrophobic filter part, and used for preventing the hydrophilic filter part from separating from the hydrophobic embedded part.

8. The gravity-driven oil-water automatic separator according to claim 1, wherein, The hydrophilic filter part has a hydrophilic surface obtained by surface deposition of polypyrrole / silver; The hydrophobic filter part has a hydrophobic surface obtained by surface deposition of polypyrrole / silver / dodecanethiol.

9. A method of manufacturing a gravity-driven oil-water automatic separator according to any one of claims 1-8, characterized in that, The preparation method comprises the following steps: S1. Printing a hydrophilic filter part substrate and a hydrophobic filter part substrate by using a 3D printing technology; S2. sequentially performing alkali treatment, mixed solution treatment of pyrrole and FeCl3, and silver ammonia solution treatment on the hydrophilic filter part substrate to obtain a hydrophilic filter part, and then sequentially performing alkali treatment, mixed solution treatment of pyrrole and FeCl3, silver ammonia solution treatment, and alcohol aqueous solution treatment of dodecanethiol on the hydrophobic filter part substrate to obtain a hydrophobic filter part; S3. Embedding the hydrophilic filter part and the hydrophobic filter part together to form the oil-water automatic separator.

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