A membrane-scraping microchannel-based demulsification system and method thereof

Abstract

The application relates to the technical field of demulsification equipment, in particular to a demulsification system based on a scraped-film microchannel and a method thereof.The demulsification system comprises a scraped-film demulsification part, a filter part and the like.The scraped-film demulsification part comprises a demulsification inner cylinder and a demulsification outer cylinder, the demulsification outer cylinder is sleeved on the periphery of the demulsification inner cylinder, and the gap between the demulsification inner cylinder and the demulsification outer cylinder forms a microchannel; the outer wall of the demulsification outer cylinder is provided with a feeding port, an upper discharging port and a lower discharging port, the upper discharging port and the lower discharging port are arranged on the outer wall of one side of the demulsification outer cylinder, and the feeding port is arranged on the outer wall of the other side of the demulsification outer cylinder, so that the microchannel is divided into an oleophilic section and a hydrophilic section; the filter part comprises at least one group of hollow fiber membranes, one end of the hollow fiber membrane arranged in the microchannel abuts against the inner wall of the demulsification outer cylinder, and the other end of the hollow fiber membrane abuts against the outer wall of the demulsification inner cylinder; and the demulsification system can improve the demulsification effect of demulsification wastewater based on the scraped-film microchannel and the hollow fiber membrane.

Description

Technical Field

[0001] This application relates to the field of demulsification equipment technology, and in particular to a demulsification system and method based on a scraped microchannel. Background Technology

[0002] Currently, emulsion wastewater accounts for a large proportion of organic wastewater, and demulsification is the most critical process for treating emulsion wastewater. Commonly used demulsification processes include pH adjustment, microwave treatment, heat treatment, centrifugal sedimentation, chemical treatment, and electropolymerization. However, these technologies have disadvantages such as low demulsification efficiency, large equipment size, and secondary pollution. At present, emerging demulsification methods are represented by microchannel technology. Generally, microchannel demulsification technology uses small reaction devices, which gives it advantages such as high specific surface area, low reagent requirements, micron-level size, and special micro-flow characteristics. This gives microchannel demulsification advantages such as short reaction time and low energy consumption.

[0003] Most current microchannel demulsification devices can only target emulsion materials with a particle size >10μm. Although a small number of microchannel devices can demulsify emulsion materials with a particle size <10μm, small-sized oil-in-water or water-in-oil microspheres in emulsion wastewater are difficult to demulsify with existing-sized microchannel devices. Undemulsified oil-in-water or water-in-oil microspheres will randomly flow out of the microchannel demulsification device, thus failing to achieve effective demulsification of emulsion wastewater. Summary of the Invention

[0004] This application provides a demulsification system and method based on a scraped-film microchannel to solve the following technical problem: how to improve the demulsification effect of emulsion wastewater.

[0005] In a first aspect, this application provides a demulsification system based on a scraped-film microchannel, the demulsification system comprising: The film-scraping demulsifier includes an inner demulsifier cylinder and an outer demulsifier cylinder. The outer demulsifier cylinder is sleeved around the inner demulsifier cylinder, and the gap between the inner and outer demulsifier cylinders forms a microchannel. The outer wall of the outer demulsifier cylinder is provided with an inlet, an upper outlet, and a lower outlet. The upper outlet and the lower outlet are respectively located on one side of the outer wall of the outer demulsifier cylinder, and the inlet is located on the other side of the outer wall of the outer demulsifier cylinder, so as to divide the microchannel into an oleophilic section and a hydrophilic section. The filtration section includes at least one set of hollow fiber membranes, wherein one end of the hollow fiber membranes is disposed within the microchannel and abuts against the inner wall of the demulsifying outer cylinder, and the other end of the hollow fiber membranes abuts against the outer wall of the demulsifying inner cylinder.

[0006] Optionally, taking the horizontal plane where the lower end of the feed inlet is located as the reference plane, the materials of the demulsifying inner cylinder and the demulsifying outer cylinder above the reference plane are hydrophobic materials, and the materials of the demulsifying inner cylinder and the demulsifying outer cylinder below the reference plane are hydrophilic materials.

[0007] Optionally, the hollow fiber membrane is disposed between the feed inlet and the discharge outlet, and the hollow fiber membrane is made of a hydrophilic material.

[0008] Optionally, the hollow fiber membrane is further disposed between the feed inlet and the upper discharge outlet, and the hollow fiber membrane is made of a hydrophobic material.

[0009] Optionally, the pore size of the hollow fiber membrane is 1 nm to 10 nm.

[0010] Optionally, the thickness of the hollow fiber membrane is 2 mm to 5 mm.

[0011] Optionally, the preset distance is 2μm to 10μm.

[0012] Optionally, the spacing between the microchannels is 10mm to 20mm.

[0013] Secondly, this application provides a demulsification method based on a scraped microchannel, the demulsification method being adapted to the demulsification system described in the first aspect, the demulsification method comprising: Emulsion wastewater was demulsified using a rotary microchannel method to obtain a crude oil phase and a crude aqueous phase, respectively. The demulsified oil phase and the demulsified water phase were filtered using hollow fiber membranes to obtain the demulsified oil phase and the demulsified water phase, respectively.

[0014] Optionally, the rotational speed of the rotary microchannel demulsifier is 300 rpm to 600 rpm.

[0015] The technical solutions provided in this application have the following advantages compared with the prior art: This application provides a demulsification system based on a scraped-film microchannel. The demulsification system includes: a scraped-film demulsification section, comprising an inner demulsification cylinder and an outer demulsification cylinder, the outer demulsification cylinder being sleeved around the inner demulsification cylinder, and the gap between the inner and outer demulsification cylinders forming a microchannel; the outer wall of the outer demulsification cylinder is provided with an inlet, an upper outlet, and a lower outlet, the upper outlet and the lower outlet being respectively located on one side of the outer wall of the outer demulsification cylinder, and the inlet being located on the other side of the outer wall of the outer demulsification cylinder, so as to divide the microchannel into an oleophilic section and a hydrophilic section; and a filtration section, comprising at least one set of hollow fiber membranes, the at least one set of hollow fiber membranes being disposed within the microchannel, one end of the hollow fiber membrane abutting against the inner wall of the outer demulsification cylinder, and the other end of the hollow fiber membrane abutting against the outer wall of the inner demulsification cylinder. Rotary microchannels can not only demulsify demulsified wastewater, but also separate the oil and water phases of the wastewater based on the centrifugal force of rotation. By introducing a hollow fiber membrane into the traditional rotary microchannel, the hollow fiber membrane can also block the water-in-oil microspheres in the oil phase and the oil-in-water microspheres in the water phase during the rotation of the rotary microchannel. This can promote further demulsification of the water-in-oil microspheres or the oil-in-water microspheres in the water phase, or allow them to remain in the rotary microchannel, so as to obtain a pure oil phase or water phase. Thus, the demulsification effect of demulsified wastewater can be improved by using a scraped membrane microchannel and a hollow fiber membrane. Attached Figure Description

[0016] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A schematic diagram of a demulsification system based on a scraped microchannel provided in this application embodiment; Figure 2 A schematic diagram of a demulsification method based on a scraped microchannel provided in this application embodiment; Among them, 1-demulsifying inner cylinder, 2-demulsifying outer cylinder, 21-feed inlet, 22-upper outlet, 23-lower outlet, 3-hollow fiber membrane. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0020] Various embodiments of this application may exist in the form of a range; it should be understood that the description in the form of a range is merely for convenience and brevity and should not be construed as a hard limitation on the scope of this application; therefore, it should be considered that the range description has specifically disclosed all possible sub-ranges and single numerical values ​​within that range; for example, it should be considered that the range description from 1 to 6 has specifically disclosed sub-ranges such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., and single numbers within the range such as 1, 2, 3, 4, 5, and 6, regardless of the range; in addition, whenever a numerical range is indicated herein, it means including any referenced number (fraction or integer) within the indicated range.

[0021] In this document, terms such as “comprising” mean “including but not limited to”. Relational terms such as “first” and “second” are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. “And / or” describes the relationship between related objects, indicating that there can be three relationships, for example, A and / or B can mean: A alone, A and B simultaneously, or B alone; where A and B can be singular or plural. “At least one” means one or more, “more” means two or more; “at least one,” “at least one of the following,” or similar expressions refer to any combination of these items, including any combination of single or plural items; for example, “at least one of a, b, or c,” or “at least one of a, b, and c,” can both mean: a, b, c, ab (i.e., a and b), ac, bc, or abc, where a, b, and c can be single or multiple. Unless otherwise specified, all raw materials, reagents, instruments and equipment used in this application can be purchased from the market or prepared by existing methods.

[0022] Figure 1 An exemplary schematic diagram of a demulsification system based on a scraped microchannel provided in an embodiment of this application is shown; like Figure 1As shown, this application provides a demulsification system based on a scraped-film microchannel, the demulsification system comprising: The film-scraping demulsifier includes an inner demulsifier cylinder and an outer demulsifier cylinder. The outer demulsifier cylinder is sleeved around the inner demulsifier cylinder, and the gap between the inner and outer demulsifier cylinders forms a microchannel. The outer wall of the outer demulsifier cylinder is provided with an inlet, an upper outlet, and a lower outlet. The upper outlet and the lower outlet are respectively located on one side of the outer wall of the outer demulsifier cylinder, and the inlet is located on the other side of the outer wall of the outer demulsifier cylinder, so as to divide the microchannel into an oleophilic section and a hydrophilic section. The filtration section includes at least one set of hollow fiber membranes, wherein one end of the hollow fiber membranes is disposed within the microchannel and abuts against the inner wall of the demulsifying outer cylinder, and the other end of the hollow fiber membranes abuts against the outer wall of the demulsifying inner cylinder.

[0023] It should be noted that the rotating demulsifier typically rotates the inner demulsifier cylinder while the outer demulsifier cylinder remains fixed, thus enabling the microchannels to rotate continuously.

[0024] It should be noted that the rotating demulsifier can be rotated in a vertical plane by means of a rotating shaft. For the specific structure, please refer to the structure shown in CN201911329743.2.

[0025] In some optional embodiments, the horizontal plane at the lower end of the feed inlet is used as the reference plane. The materials of the demulsifying inner cylinder and the demulsifying outer cylinder above the reference plane are hydrophobic materials, and the materials of the demulsifying inner cylinder and the demulsifying outer cylinder below the reference plane are hydrophilic materials. In these embodiments, the horizontal plane at the lower end of the feed inlet is used as the reference plane, and the materials of the demulsifying inner cylinder and the demulsifying outer cylinder are set to be hydrophobic and hydrophilic materials respectively. Based on the characteristic that the density of the oil phase is less than that of the water phase, the oil phase and the water phase can be made to be compatible with the corresponding materials respectively, so as to further improve the demulsification effect of the emulsion wastewater.

[0026] It should be noted that the hydrophobic material can be polytetrafluoroethylene (PTFE), and the hydrophilic material can be polymethyl methacrylate (PMMA).

[0027] In some optional embodiments, the hollow fiber membrane is disposed between the feed inlet and the lower discharge outlet, and the hollow fiber membrane is made of a hydrophilic material; In some optional embodiments, the hollow fiber membrane is further disposed between the feed inlet and the upper discharge outlet, and the hollow fiber membrane is made of a hydrophobic material; In these embodiments, hollow fiber membranes of different materials are used for different parts, which can be combined with the rotation characteristics of the rotary microchannel to effectively block and filter the corresponding oil-in-water microspheres or water-in-oil microspheres in the demulsified wastewater, thereby improving the demulsification effect of the rotary microchannel.

[0028] In some optional embodiments, the pore size of the hollow fiber membrane is 1 nm to 10 nm; In these embodiments, the pore size of the hollow fiber membrane can be 1 nm to 10 nm, which can ensure that the hollow fiber membrane has sufficient pore size. Hollow fibers with sufficient pore size can effectively block and filter water-in-oil microspheres or oil-in-water microspheres in demulsified wastewater, thereby improving the demulsification effect of the rotating microchannel.

[0029] The pore size of the hollow fiber membrane can be 1nm, 2nm, 3nm, 4nm, 5nm, 6nm, 7nm, 8nm, 9nm or 10nm.

[0030] In some optional embodiments, the thickness of the hollow fiber membrane is 2 mm to 5 mm; In these embodiments, the thickness of the hollow fiber membrane can be 2 mm to 5 mm, which can ensure that the hollow fiber membrane has sufficient thickness. The hollow fiber with sufficient thickness can effectively block and filter the oil-in-water microspheres or water-in-oil microspheres in the demulsified wastewater, thereby improving the demulsification effect of the rotating microchannel.

[0031] The thickness of the hollow fiber membrane can be 2mm, 3mm, 4mm or 5mm.

[0032] In some optional implementations, the preset distance is 2μm to 10μm; In these embodiments, the preset distance can be 2μm to 10μm, which can prevent the hollow fiber membrane from contacting the demulsification inner cylinder and also prevent the demulsification wastewater from flowing directly out from the pores between the hollow fiber membrane and the demulsification inner cylinder. This can effectively block and filter the oil-in-water microspheres or water-in-oil microspheres in the demulsification wastewater, thereby improving the demulsification effect of the rotating microchannel.

[0033] The preset distance can be 2μm, 3μm, 4μm, 5μm, 6μm, 7μm, 8μm, 9μm or 10μm.

[0034] In some optional embodiments, the spacing between the microchannels is 10mm to 20mm; In these embodiments, the spacing between the microchannels can be 10mm to 20mm, which allows the microchannels to have a sufficiently small space. The microchannels with a sufficiently small space can improve the demulsification effect of the demulsifying wastewater.

[0035] The spacing of the microchannels can be 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm or 20mm.

[0036] Figure 2 An exemplary schematic diagram of a demulsification method based on a scraped microchannel provided in an embodiment of this application is shown. Based on a general inventive concept, such as Figure 2 As shown, this application provides a demulsification method based on a scraped microchannel, the demulsification method being adapted to the demulsification system, the demulsification method comprising: S1. Rotary microchannel demulsification is performed on emulsion wastewater to obtain demulsified crude oil phase and demulsified crude aqueous phase, respectively; S2. The demulsified oil crude phase and the demulsified water crude phase are filtered using hollow fiber membranes to obtain the demulsified oil phase and the demulsified water phase, respectively.

[0037] This demulsification method is based on the demulsification system described above. The specific structure of the demulsification system can be referred to in the above embodiments. Since this demulsification method adopts some or all of the technical solutions of the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated here.

[0038] In some alternative embodiments, the rotational speed of the rotary microchannel demulsifier is 300 rpm to 600 rpm; In these embodiments, the rotation speed of the rotary microchannel demulsifier can be 300 rpm to 600 rpm, which can ensure that the rotary microchannel has a sufficient rotation speed. The rotary microchannel with a sufficient rotation speed can effectively improve the separation effect of the oil phase and the water phase in the demulsified wastewater, so as to cooperate with the blocking and filtering effect of the hollow fiber membrane to remove the water-in-oil microspheres in the separated oil phase and the oil-in-water microspheres in the water phase.

[0039] The present application is further illustrated below with reference to specific embodiments. Experimental methods in the following embodiments that do not specify specific conditions are generally determined according to industry standards; if no corresponding industry standard exists, they are performed according to general international standards, conventional conditions, or conditions recommended by the manufacturer. Example 1

[0040] like Figure 1 As shown, a demulsification system based on a scraped-film microchannel includes: The film-scraping demulsifier includes an inner demulsifier cylinder and an outer demulsifier cylinder. The outer demulsifier cylinder is sleeved around the inner demulsifier cylinder, and the gap between the inner and outer demulsifier cylinders forms a microchannel. The outer wall of the outer demulsifier cylinder is provided with an inlet, an upper outlet, and a lower outlet. The upper outlet and the lower outlet are respectively located on one side of the outer wall of the outer demulsifier cylinder, and the inlet is located on the other side of the outer wall of the outer demulsifier cylinder, so as to divide the microchannel into an oleophilic section and a hydrophilic section. The filtration section includes at least one set of hollow fiber membranes, wherein one end of the hollow fiber membrane abuts against the inner wall of the demulsifying outer cylinder and the other end of the hollow fiber membrane abuts against the outer wall of the demulsifying inner cylinder.

[0041] Using the horizontal plane at the lower end of the feed inlet as the reference plane, the materials of the inner and outer demulsifying cylinders above the reference plane are hydrophobic, while the materials of the inner and outer demulsifying cylinders below the reference plane are hydrophilic.

[0042] The hollow fiber membrane is located between the inlet and the outlet, and the hollow fiber membrane is made of a hydrophilic material.

[0043] The hollow fiber membrane is also located between the feed inlet and the upper discharge outlet. The hollow fiber membrane is made of hydrophobic material.

[0044] The hollow fiber membrane has a pore size of 5 nm.

[0045] The thickness of the hollow fiber membrane is 3 mm.

[0046] The preset distance is 5μm.

[0047] The spacing between the microchannels is 15mm.

[0048] like Figure 2 As shown, a demulsification method based on a scraped-film microchannel is described. This demulsification method is adapted to a demulsification system and includes: S1. Rotary microchannel demulsification is performed on emulsion wastewater to obtain demulsified crude oil phase and demulsified crude aqueous phase, respectively; S2. Use hollow fiber membranes to filter the demulsified oil phase and the demulsified water phase respectively to obtain the demulsified oil phase and the demulsified water phase respectively.

[0049] The rotation speed of the rotary microchannel demulsifier is 500 rpm. Example 2

[0050] Based on the content disclosed in Example 1, the following modifications are made: The hollow fiber membrane has a pore size of 10 nm. Example 3

[0051] Based on the content disclosed in Example 1, the following modifications are made: The hollow fiber membrane has a pore size of 1 nm. Example 4

[0052] Based on the content disclosed in Example 1, the following modifications are made: The thickness of the hollow fiber membrane is 2 mm. Example 5

[0053] Based on the content disclosed in Example 1, the following modifications are made: The thickness of the hollow fiber membrane is 5 mm. Example 6

[0054] Based on the content disclosed in Example 1, the following modifications are made: The preset distance is 2μm. Example 7

[0055] Based on the content disclosed in Example 1, the following modifications are made: The preset distance is 10μm. Example 8

[0056] Based on the content disclosed in Example 1, the following modifications are made: The spacing between the microchannels is 10 mm.

[0057] The rotation speed of the rotary microchannel demulsifier is 600 rpm. Example 9

[0058] Based on the content disclosed in Example 1, the following modifications are made: The spacing between the microchannels is 20mm.

[0059] The rotation speed of the rotary microchannel demulsifier is 300 rpm.

[0060] Comparative Example 1 Based on the content disclosed in Example 1, the following modifications are made: Hollow fiber membranes are not used.

[0061] Comparative Example 2 Based on the content disclosed in Example 1, the following modifications are made: The hollow fiber membrane has a pore size of 20 nm.

[0062] Comparative Example 3 Based on the content disclosed in Example 1, the following modifications are made: The thickness of the hollow fiber membrane is 10 mm.

[0063] Comparative Example 4 Based on the content disclosed in Example 1, the following modifications are made: The preset distance is 20μm.

[0064] Comparative Example 5 Based on the content disclosed in Example 1, the following modifications are made: The spacing between the microchannels is 8mm.

[0065] Comparative Example 6 Based on the content disclosed in Example 1, the following modifications are made: The spacing between the microchannels is 30mm.

[0066] Comparative Example 7 Based on the content disclosed in Example 1, the following modifications are made: The rotation speed of the rotary microchannel demulsifier is 200 rpm.

[0067] Comparative Example 8 Based on the content disclosed in Example 1, the following modifications are made: The rotation speed of the rotary microchannel demulsifier is 800 rpm.

[0068] Relevant experimental and effect data: The demulsification efficiency, oil content of water-in-oil microspheres in the oil phase after demulsification, and water content of oil-in-water microspheres in the aqueous phase after demulsification were statistically analyzed for each embodiment and comparative example. The results are shown in Table 1. Table 1. Demulsification efficiency, water-in-oil microsphere content, and oil-in-water microsphere content of demulsification wastewater in various embodiments and comparative examples.

[0069] As shown in Table 1, the demulsification system based on a scraped microchannel provided in this application introduces a hollow fiber membrane into a traditional rotating microchannel. During the rotation phase of the rotating microchannel, the hollow fiber membrane can also block the water-in-oil microspheres in the oil phase and the oil-in-water microspheres in the aqueous phase, respectively. This can promote further demulsification of the water-in-oil microspheres or the oil-in-water microspheres in the scraped microchannel or allow them to remain directly in the scraped microchannel. As a result, an oil phase and an aqueous phase with an oil content of less than 85% and a water content of less than 50% can be obtained from the water-in-oil microspheres. In addition, the demulsification efficiency of the demulsification wastewater can be increased to more than 98%.

[0070] Although Comparative Example 5 achieved a demulsification efficiency of up to 99.5% for demulsified wastewater, the overall demulsification time was relatively long due to the small spacing of the microchannels.

[0071] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. 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 this application. Therefore, this application 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 claimed in this application.

Claims

1. A demulsification system based on a scraped-film microchannel, characterized in that, The demulsifying system includes: The film-scraping demulsifier includes an inner demulsifying cylinder and an outer demulsifying cylinder. The outer demulsifying cylinder is sleeved around the inner demulsifying cylinder, and the gap between the inner and outer cylinders forms a microchannel. The outer wall of the outer cylinder is provided with an inlet, an upper outlet, and a lower outlet. The upper and lower outlets are respectively located on one side of the outer wall of the outer cylinder, and the inlet is located on the other side of the outer wall, thereby dividing the microchannel into an oleophilic section and a hydrophilic section. The inner demulsifying cylinder is rotated while the outer cylinder remains stationary, thereby achieving continuous rotation of the microchannel. The filtration section includes a first hollow fiber membrane and a second hollow fiber membrane. Both the first hollow fiber membrane and the second hollow fiber membrane are disposed in the microchannel. One end of the first hollow fiber membrane and the second hollow fiber membrane respectively abuts against the inner wall of the demulsifying outer cylinder, and the other end of the first hollow fiber membrane and the second hollow fiber membrane are respectively separated from the outer wall of the demulsifying inner cylinder by a preset distance. The preset distance is 2μm to 10μm; the pore size of the first hollow fiber membrane and the second hollow fiber membrane is 1nm to 10nm; The first hollow fiber membrane is disposed between the feed inlet and the lower discharge outlet, and the material of the first hollow fiber membrane is a hydrophilic material; The second hollow fiber membrane is disposed between the feed inlet and the upper discharge outlet, and the material of the second hollow fiber membrane is a hydrophobic material.

2. The demulsification system according to claim 1, characterized in that, With the horizontal plane at the lower end of the feed inlet as the reference plane, the materials of the demulsifying inner cylinder and the demulsifying outer cylinder above the reference plane are hydrophobic materials, and the materials of the demulsifying inner cylinder and the demulsifying outer cylinder below the reference plane are hydrophilic materials.

3. The demulsification system according to claim 1, characterized in that, The thickness of the hollow fiber membrane is 2mm to 5mm.

4. The demulsification system according to claim 1, characterized in that, The spacing between the microchannels is 10mm to 20mm.

5. A demulsification method based on a scraped-film microchannel, characterized in that, The demulsification method is adapted to the demulsification system as described in any one of claims 1 to 4, and the demulsification method includes: Emulsion wastewater was demulsified using a rotary microchannel method to obtain a crude oil phase and a crude aqueous phase, respectively. The demulsified crude oil phase and the demulsified crude aqueous phase were filtered using hollow fiber membranes to obtain the demulsified oil phase and the demulsified aqueous phase, respectively.

6. The demulsification method according to claim 5, characterized in that, The rotation speed of the rotary microchannel demulsifier is 300 rpm to 600 rpm.

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