A demulsifying filter material for oil-water separation and preparation method thereof

Abstract

The present invention introduces a demulsification filter material for oil-water separation, which includes a support layer, a coalescence layer and a separation layer, wherein the coalescence layer and the separation layer are alternately distributed in the support layer; the coalescence layer includes a coalescence filling layer and a hydrophilic-lipophilic modified filter cloth; the coalescence filling layer is located between two hydrophilic-lipophilic modified filter cloths; the coalescence filling layer includes hydrophilic-lipophilic modified glass microbeads, active manganese oxide powder and carbon nanotubes modified by manganese zinc oxide coating; the separation layer includes a separation filling layer and a hydrophobic-lipophilic modified filter cloth; the separation filling layer is located between two hydrophobic-lipophilic modified filter cloths; the separation filling layer includes hydrophobic-lipophilic modified glass microbeads, vacant manganese oxide powder and carbon nanotubes modified by manganese zinc oxide coating. The coalescence layer designed in the present application allows water droplets to enter for coalescence, first captures small water droplets in the coalescence layer, then combines to form larger water droplets, and then separates and releases them in the separation layer, thereby achieving the demulsification effect of oil-water separation.

Description

Technical Field

[0001] The invention belongs to the field of oil-water separation filter material preparation, and specifically relates to a demulsified filter material for oil-water separation and a preparation method thereof. Background Art

[0002] With the rapid development of industry and the continuous improvement of people's living standards, the demand for petrochemical products is increasing. A large amount of oily wastewater will inevitably be generated during the production process of petrochemical products, the process of oil extraction and transportation, and the use of petrochemical products. Due to the poor biodegradability of these wastewaters, it is difficult to achieve effective treatment and discharge in compliance with standards. Moreover, these untreated oily wastewaters directly enter natural water bodies, causing serious pollution to the environment and posing a serious threat to the ecology and human health and survival.

[0003] Common methods for treating oily wastewater include: gravity separation, centrifugal separation, electrochemical method, flocculation, flotation, adsorption, activated sludge, biofilm, etc. These traditional treatment methods generally have the disadvantages of complex operation, low separation efficiency, high energy consumption, difficulty in treating wastewater containing surfactants and emulsified oil, and easy to produce secondary pollution. In recent years, with the continuous development of membrane separation technology, the application of membrane separation in the field of oil-water separation has attracted more and more attention from researchers. Compared with traditional oil-water separation methods, membrane separation has the advantages of simple operation, high separation efficiency, high energy utilization, effective treatment of wastewater containing surfactants and emulsified oil, and demulsification without the need for an external electric field or chemical agents. It is considered to be a more promising method for oil-water separation.

[0004] Chinese patent CN103073091B discloses an oil-water separation device for thin oil film separation and recovery, which includes a box body, an inlet is provided at the front of the box body, an outlet is provided at the rear, and at least one layer of flow blocking device composed of flow blocking separation plates and comb column arrays is provided at the lower part of the box body; a box cover is sealed and connected to the top of the box body, which gradually rises from the back to the front and from the left to the middle to form a conical structure; an oil collecting well is vertically provided at the highest point of the conical structure on the outer wall of the box cover, and the oil collecting well is connected to the inside of the box body and the external atmosphere, an oil level detector is provided in the oil collecting well, and a connecting side pipe is provided on the pipe wall of the oil collecting well, and a solenoid valve is provided on the connecting side pipe; the oil-water separation device invented by the invention is a left-right symmetrical structure about the center line of the box body. The oil-water separation device invented by the invention for thin oil film separation and recovery is particularly suitable for oil-water separation and recovery of micron-level thin oil films.

[0005] Chinese patent CN214087973U discloses a novel oil-water separation PVDF membrane device, which aims to solve the technical problems of inconvenient cleaning and inconvenient oil film replacement. In order to solve the above technical problems, it provides a novel oil-water separation PVDF membrane device, which takes the novel oil-water separation PVDF membrane as the core, and is mainly composed of a filter tube, a rotating mechanism and a removal mechanism. By using the hinge and the connecting block in the rotating mechanism, the first arc plate can be turned out and hung down, thereby facilitating the cleaning and replacement of the filter screen, thereby reducing the cleaning steps; by using the iron rope and the spring in the removal mechanism, the second arc plate can be easily pulled out and put back, thereby achieving the effect of removing the oil-water separation membrane on the second arc plate, thereby facilitating the replacement of the second arc plate.

[0006] However, when using membranes to separate oil-water emulsions containing surfactants, during long-term continuous operation, serious membrane contamination problems will occur due to the adhesion of oil droplets, adsorption of surfactants, failure of surface wettability / anti-wetting properties, and destruction of micro-nano structures. Membrane contamination will lead to a rapid decrease in membrane flux, a gradual decline in separation efficiency, and a rapid reduction in membrane life. At the same time, the preparation technology of oil membranes is extremely complicated and cumbersome due to the characteristics of oil membranes, and is not suitable for large-scale production in factories. Summary of the invention

[0007] In order to solve the above problems, in order to achieve the treatment of oil-water emulsified waste liquid and the simplification of the oil film filter material preparation method, while avoiding the low separation efficiency caused by membrane pollution problems; thereby achieving the effect of strengthening demulsification and oil-water separation; in order to achieve the above effects, the present invention designs a demulsification filter material for oil-water separation, and designs a preparation method thereof.

[0008] A demulsifying filter material for oil-water separation, comprising a support layer, a coalescing layer and a separation layer, wherein the coalescing layer and the separation layer are alternately combined and distributed in the support layer;

[0009] The coalescing layer comprises a coalescing filling layer and a hydrophilic-lipophilic modified filter cloth; the coalescing filling layer is located between two hydrophilic-lipophilic modified filter cloths;

[0010] The separation layer comprises a separation filling layer and a hydrophobic and lipophilic modified filter cloth; the separation filling layer is located between two hydrophobic and lipophilic modified filter cloths.

[0011] Preferably, the agglomerated filling layer comprises hydrophilic-lipophilic modified glass microspheres, active manganese oxide powder and carbon nanotubes modified with a manganese zinc oxide coating;

[0012] The weight ratio of the hydrophilic-lipophilic modified glass microspheres is between 60% and 90%, the weight ratio of the active manganese oxide powder is between 5% and 20%, and the weight ratio of the carbon nanotubes modified by the manganese zinc oxide coating is between 5% and 20%.

[0013] Preferably, the separation filling layer comprises hydrophobic and oleophilic modified glass microbeads, vacancy manganese oxide powder and carbon nanotubes modified with manganese zinc oxide coating;

[0014] The weight ratio of the hydrophobic and lipophilic modified glass microspheres is between 80% and 90%, the weight ratio of the missing manganese oxide powder is between 5% and 10%, and the weight ratio of the carbon nanotubes modified by the manganese zinc oxide coating is between 5% and 10%.

[0015] Preferably, the diameter of the hydrophilic-lipophilic modified glass microspheres is 30-50 um.

[0016] Preferably, the diameter of the hydrophobic-lipophilic modified glass microspheres is 30-50 um.

[0017] Preferably, the filtration pore size of the hydrophilic-lipophilic modified filter cloth is 5 to 15 um.

[0018] Preferably, the filtration pore size of the hydrophobic and oleophilic modified filter cloth is 5 to 15 um.

[0019] Preferably, a PP melt-blown non-woven fabric is further arranged between the coalescence filling layer and the hydrophilic-oleophilic modified filter cloth; and a PP melt-blown non-woven fabric is further arranged between the separation filling layer and the hydrophobic-oleophilic modified filter cloth.

[0020] Preferably, short fibers are also added to the coalescence filling layer and the separation filling layer, and the volume mixing ratio of the short fibers to other materials in the coalescence filling layer or the separation filling layer is 5:1 to 10:1;

[0021] The short fibers are carbon fibers or other synthetic fibers;

[0022] The length of the short fibers is 0.2 to 0.5 mm, and the diameter is 5 to 10 um.

[0023] Preferably, a method for preparing a demulsified filter material for oil-water separation comprises:

[0024] S101, mixing hydrophilic and lipophilic modified glass microspheres, active manganese oxide powder and carbon nanotubes modified by manganese zinc oxide coating in proportion to form an agglomerated filling layer, and adding short fibers as needed;

[0025] S102, placing a coalescing filling layer between two hydrophilic and lipophilic modified filter cloths to form a coalescing layer, and arranging a PP melt-blown non-woven fabric between the coalescing filling layer and the hydrophilic and lipophilic modified filter cloths as needed;

[0026] S103, mixing hydrophobic and lipophilic modified glass microbeads, vacancy manganese oxide powder and carbon nanotubes modified with manganese zinc oxide coating in proportion to form a separation filling layer, and adding short fibers as needed;

[0027] S104, placing a separation filling layer between two hydrophobic and oleophilic modified filter cloths to form a separation layer, and arranging a PP melt-blown non-woven fabric between the separation filling layer and the hydrophobic and oleophilic modified filter cloths as needed;

[0028] S105, the coalescence layer and the separation layer are alternately combined and distributed, and placed in the support layer to form a demulsified filter material for oil-water separation.

[0029] The advantages and effects of this application are as follows:

[0030] 1. The coalescence layer used in this application allows water droplets to enter for coalescence. Small water droplets are first captured in the coalescence layer, then combined to form larger water droplets, and then separated and released in the separation layer, thereby achieving the technical effect of oil-water separation.

[0031] 2. The present application adopts the repetition of the coalescence-separation unit, specifically, the use of an alternating combination of coalescence layers and separation layers to achieve the effect of enhancing oil-water separation.

[0032] 3. The present application adopts filter materials of different properties, specifically hydrophilic-lipophilic modified glass microbeads, hydrophobic-lipophilic modified glass microbeads, activated manganese oxide powder, vacancy manganese oxide powder and carbon nanotubes modified with manganese zinc oxide coating, to achieve the purpose of multi-stage separation; it can avoid the low separation efficiency caused by the single-layer membrane contamination problem, and achieve the technical effect of ensuring the stable operation of the device.

[0033] 4. This application uses filter materials of different forms, including a combination of short fibers and powders, and corresponding surface modifications to further enhance the effects of demulsification and oil-water separation; through specific structures and preparation methods, filter material products that can meet practical applications are formed.

[0034] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application so that it can be implemented in accordance with the contents of the specification, and to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the following is a detailed description of the preferred embodiments of the present application in conjunction with the accompanying drawings as follows.

[0035] Based on the detailed description of the specific embodiments of the present application in combination with the accompanying drawings below, those skilled in the art will become more aware of the above and other objects, advantages and features of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can also be obtained based on these drawings without creative work. In all drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual scale.

[0037] Figure 1 A multilayer structure of a demulsified filter material for oil-water separation provided by the present invention;

[0038] Figure 2 This is a diagram showing the structure of the agglomeration layer of a demulsifier filter material for oil-water separation provided by the present invention;

[0039] Figure 3 A separation layer structure diagram of a demulsified filter material for oil-water separation provided by the present invention;

[0040] Figure numerals: 1. support layer; 2. coalescence layer; 3. separation layer; 4. hydrophilic-oleophilic modified filter cloth; 5. coalescence filling layer; 6. hydrophobic-oleophilic modified filter cloth; 7. separation filling layer. DETAILED DESCRIPTION

[0041] To make the purpose, technical scheme and advantages of the embodiment of the present application clearer, the technical scheme in the embodiment of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiment of the present application. Obviously, the described embodiment is a part of the embodiment of the present application, rather than all of the embodiments. In the following description, specific details such as specific configuration and components are provided only to help fully understand the embodiments of the present application. Therefore, it should be clear to those skilled in the art that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present application. In addition, for clarity and brevity, the description of known functions and structures is omitted in the embodiment.

[0042] It should be understood that the references to "one embodiment" or "this embodiment" throughout the specification mean that the specific features, structures, or characteristics associated with the embodiment are included in at least one embodiment of the present application. Therefore, the references to "one embodiment" or "this embodiment" appearing throughout the specification do not necessarily refer to the same embodiment. In addition, these specific features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0043] In addition, the present application may repeat reference numerals and / or letters in different examples. This repetition is for the purpose of simplicity and clarity, and does not in itself indicate the relationship between the various embodiments and / or settings discussed.

[0044] The term "and / or" in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, B exists alone, and A and B exist at the same time. The term " / and" in this article describes another type of association object relationship, indicating that there can be two relationships. For example, A / and B can mean: A exists alone, and A and B exist alone. In addition, the character " / " in this article generally indicates that the previous and next associated objects are in an "or" relationship.

[0045] The term "at least one" in this article is merely a description of the association relationship of associated objects, indicating that there may be three relationships. For example, at least one of A and B can mean: A exists alone, A and B exist at the same time, and B exists alone.

[0046] It should also be noted that, in this article, relational terms such as first and second, etc. are only used 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. Moreover, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusions.

[0047] Example 1

[0048] This example mainly introduces the composition of a demulsifier filter material for oil-water separation. Figure 1-3 , Figure 1 A multilayer structure of a demulsified filter material for oil-water separation provided by the present invention; Figure 2 This is a diagram showing the structure of the agglomeration layer of a demulsifier filter material for oil-water separation provided by the present invention; Figure 3 This is a structural diagram of the separation layer of a demulsified filter material for oil-water separation provided by the present invention.

[0049] A demulsifying filter material for oil-water separation, comprising a support layer 1, a coalescing layer 2 and a separation layer 3, wherein the coalescing layer 2 and the separation layer 3 are alternately combined and distributed in the support layer 1;

[0050] The coalescing layer 2 includes a coalescing filling layer 5 and a hydrophilic-lipophilic modified filter cloth 4; the coalescing filling layer 5 is located between two hydrophilic-lipophilic modified filter cloths 4;

[0051] The separation layer 3 includes a separation filling layer 7 and a hydrophobic and oleophilic modified filter cloth 6 ; the separation filling layer 7 is located between two hydrophobic and oleophilic modified filter cloths 6 .

[0052] Further, the agglomerated filling layer 5 includes hydrophilic and lipophilic modified glass microspheres, active manganese oxide powder and carbon nanotubes modified with a manganese zinc oxide coating;

[0053] The weight ratio of the hydrophilic-lipophilic modified glass microspheres is between 60% and 90%, the weight ratio of the active manganese oxide powder is between 5% and 20%, and the weight ratio of the carbon nanotubes modified by the manganese zinc oxide coating is between 5% and 20%.

[0054] Further, the separation filling layer 7 includes hydrophobic and oleophilic modified glass microbeads, vacancy manganese oxide powder and carbon nanotubes modified with manganese zinc oxide coating;

[0055] The weight ratio of the hydrophobic and lipophilic modified glass microspheres is between 80% and 90%, the weight ratio of the missing manganese oxide powder is between 5% and 10%, and the weight ratio of the carbon nanotubes modified by the manganese zinc oxide coating is between 5% and 10%.

[0056] Furthermore, the diameter of the hydrophilic-lipophilic modified glass microspheres is 30 to 50 um.

[0057] Furthermore, the diameter of the hydrophobic and lipophilic modified glass microspheres is 30 to 50 um.

[0058] Furthermore, the filtration pore size of the hydrophilic-lipophilic modified filter cloth 4 is 5 to 15 um.

[0059] Furthermore, the filtration pore size of the hydrophobic and oleophilic modified filter cloth 6 is 5 to 15 um.

[0060] Furthermore, a PP melt-blown non-woven fabric is provided between the coalescence filling layer 5 and the hydrophilic-oleophilic modified filter cloth 4 ; and a PP melt-blown non-woven fabric is provided between the separation filling layer 7 and the hydrophobic-oleophilic modified filter cloth 6 .

[0061] Furthermore, short fibers are added to the coalescence filling layer 5 and the separation filling layer 7, and the volume mixing ratio of the short fibers to other materials in the coalescence filling layer 5 or the separation filling layer 7 is 5:1 to 10:1;

[0062] The short fibers are carbon fibers or other synthetic fibers;

[0063] The length of the short fibers is 0.2 to 0.5 mm, and the diameter is 5 to 10 um.

[0064] The coalescence layer used in the present application allows water droplets to enter for coalescence, where small water droplets are first captured and then combined to form larger water droplets, which are then separated and released in the separation layer, thus achieving the technical effect of oil-water separation.

[0065] The present application adopts the repetition of the coalescence-separation unit, specifically the use of an alternating combination of coalescence layers and separation layers, thereby achieving the effect of enhancing oil-water separation.

[0066] The present application adopts filter materials of different properties, specifically hydrophilic-lipophilic modified glass microbeads, hydrophobic-lipophilic modified glass microbeads, activated manganese oxide powder, vacancy manganese oxide powder and carbon nanotubes modified with manganese zinc oxide coating; the purpose of multi-stage separation can be achieved, and the low separation efficiency caused by the single-layer membrane contamination problem can be avoided, thereby achieving the technical effect of ensuring the stable operation of the device.

[0067] This application uses filter materials of different forms, including a combination of short fibers and powders, and corresponding surface modifications to further enhance the effects of demulsification and oil-water separation; through specific structures and preparation methods, filter material products that can meet practical applications are formed.

[0068] Example 2

[0069] Based on the above-mentioned Example 1, this example mainly introduces the source of materials used in a demulsified filter material for oil-water separation.

[0070] The hydrophilic and lipophilic modified filter cloth 4 refers to a modified filter cloth having hydrophilic and lipophilic properties prepared by modifying a conventional polymer filter cloth by low-temperature plasma; the filter cloth material may be other modified filter cloths such as terylene, polypropylene, and polyester.

[0071] The hydrophobic and oleophilic modified filter cloth 6 refers to a modified filter cloth having hydrophobic and oleophilic properties prepared by modifying a conventional polymer filter cloth by low-temperature plasma; the filter cloth material may be other modified filter cloths such as terylene, polypropylene, and polyester.

[0072] The hydrophilic-lipophilic modified glass microspheres refer to glass microspheres with hydrophilic and lipophilic properties prepared by modifying glass microspheres with low-temperature plasma; the diameter of the hydrophilic-lipophilic modified glass microspheres is between 30 and 50 um.

[0073] The hydrophobic and oleophilic modified glass microspheres refer to glass microspheres with hydrophobic and oleophilic properties prepared by modifying glass microspheres with low temperature plasma; the diameter of the hydrophobic and oleophilic modified glass microspheres is between 30 and 50 um.

[0074] The active manganese oxide powder refers to a fine and highly active manganese oxide powder prepared by thermal decomposition and hydrogen reduction using manganese carbonate as a raw material; wherein the particle size of the active manganese oxide powder is between 30 and 50 um.

[0075] The carbon nanotube modified with active zinc-manganese oxide coating refers to a composite material in which an active zinc-manganese oxide coating is deposited on the surface of the carbon nanotube using CVD thermal deposition technology; the length of the modified carbon nanotube is 50-100um and the diameter is between 50-200nm.

[0076] The present application provides different glass microbead diameters, particle sizes of active manganese oxide powder and specifications of modified carbon nanotubes, which is convenient for actual production.

[0077] Example 3

[0078] Based on the above-mentioned embodiments 1-2, this embodiment mainly introduces a method for preparing a demulsified filter material for oil-water separation.

[0079] S101, mixing hydrophilic and lipophilic modified glass microspheres, active manganese oxide powder and carbon nanotubes modified by manganese zinc oxide coating in proportion to form an agglomerated filling layer 5, and adding short fibers as needed;

[0080] S102, placing the coalescing filling layer 5 between two hydrophilic and lipophilic modified filter cloths 4 to form a coalescing layer 2, and arranging a PP melt-blown nonwoven fabric between the coalescing filling layer 5 and the hydrophilic and lipophilic modified filter cloths 4 as needed;

[0081] S103, mixing the hydrophobic and lipophilic modified glass microbeads, the vacancy manganese oxide powder and the carbon nanotubes modified by the manganese zinc oxide coating in proportion to form a separation filling layer 7, and adding short fibers as needed;

[0082] S104, placing the separation filling layer 7 between two hydrophobic and oleophilic modified filter cloths 6 to form a separation layer 3, and arranging a PP melt-blown non-woven fabric between the separation filling layer 7 and the hydrophobic and oleophilic modified filter cloths 6 as needed;

[0083] S105, the coalescing layer 2 and the separation layer 3 are alternately combined and distributed to form a demulsified filter material for oil-water separation.

[0084] Furthermore, the multi-layer combined demulsification filter material is assembled and hot pressed in sections, and the filter cloths are pressed every 10 to 20 mm along the length direction of the filter material to fix the mixture of filling powder and short fibers in the local space, maintain its dense state, and avoid it from loosening during use.

[0085] The preparation method of the present application is simple, the raw materials are widely available, and the materials are easy to obtain and prepare. In addition, the present application can add short fibers and PP melt-blown non-woven fabrics as needed to provide different technical solutions in actual engineering production so as to be suitable for a variety of different environments.

[0086] Example 4

[0087] Based on the above-mentioned embodiments 1-3, this embodiment mainly introduces the effect of a demulsification filter material for oil-water separation on the treatment of oil chemical wastewater containing fusel alcohol and oil.

[0088] A demulsifying filter material for oil-water separation comprises 5 layers;

[0089] The first layer is a hydrophilic and lipophilic modified polyester filter cloth with a filtration pore size of 10um and a gram weight of 100g;

[0090] The second layer is a coalesced filling layer 5, in which the weight ratio of hydrophilic modified glass microspheres is 90%, the weight ratio of active manganese oxide powder is 5%, and the weight ratio of carbon nanotubes modified by active zinc manganese oxide coating is 5%; the thickness of the coalesced filling layer 5 is 2 mm;

[0091] The third layer is a hydrophobic and oleophilic modified polyester filter cloth with a filtration pore size of 10um and a gram weight of 100g;

[0092] The fourth layer is a separation filling layer 7, in which the weight ratio of hydrophobic and lipophilic modified glass microbeads is 90%, the weight ratio of active manganese oxide powder is 5%, and the weight ratio of carbon nanotubes modified by active zinc oxide manganese coating is 5%; the thickness of the separation filling layer 7 is 2 mm;

[0093] The fifth layer is a hydrophilic and lipophilic modified polyester filter cloth with a filtration pore size of 10um and a gram weight of 100g.

[0094] Petrochemical wastewater containing fusel alcohol and oil: Petrochemical wastewater with COD>12000.

[0095] After treatment, the result is that after one filtration, the COD value reaches 1890; it can be clearly concluded that the filtration ratio can reach 85%.

[0096] Example 5

[0097] Based on the above-mentioned embodiments 1-3, this embodiment mainly introduces the effect of a demulsified filter material for oil-water separation on the treatment of marine diesel dehydration raw materials.

[0098] A demulsifying filter material for oil-water separation comprises 5 layers;

[0099] The first layer is a hydrophilic and lipophilic modified polyester filter cloth with a filtration pore size of 10um and a gram weight of 100g;

[0100] The second layer is a coalesced filling layer 5, in which the weight ratio of hydrophilic modified glass microspheres is 85%, the weight ratio of active manganese oxide powder is 5%, and the weight ratio of carbon nanotubes modified by active zinc manganese oxide coating is 10%; the thickness of the coalesced filling layer 5 is 2 mm;

[0101] The third layer is a hydrophobic and oleophilic modified polyester filter cloth with a filtration pore size of 10um and a gram weight of 100g;

[0102] The fourth layer is a separation filling layer 7, in which the weight ratio of hydrophobic and lipophilic modified glass microbeads is 85%, the weight ratio of active manganese oxide powder is 5%, and the weight ratio of carbon nanotubes modified by active zinc oxide manganese coating is 10%; the thickness of the separation filling layer 7 is 2 mm;

[0103] The fifth layer is a hydrophilic and lipophilic modified polyester filter cloth with a filtration pore size of 10um and a gram weight of 100g.

[0104] Marine diesel dehydrated liquid: -10# diesel emulsion with a water content of 10%.

[0105] For the test results, please refer to Table 1;

[0106] Table 1 Filtration results of multiple filter media

[0107]

[0108]

[0109] It can be clearly concluded from Table 1 that the filter material of the present invention is in a leading position in oil-water separation effect under different environments compared with domestic filter materials and filter materials provided by PALL Company of the United States.

[0110] Example 6

[0111] Based on the above-mentioned embodiments 1-3, this embodiment mainly introduces the effect of a demulsified filter material for oil-water separation on the treatment of fracturing produced water in Daqing Oilfield.

[0112] A demulsifying filter material for oil-water separation comprises 7 layers;

[0113] The first layer is a hydrophilic and lipophilic modified polyester filter cloth with a filtration pore size of 10um and a gram weight of 100g;

[0114] The second layer is hydrophilic-lipophilic modified PP meltblown cloth with a filtration pore size of 5um and a gram weight of 40g;

[0115] The third layer is a coalesced filling layer 5, in which the weight ratio of hydrophilic modified glass microspheres is 80%, the weight ratio of active manganese oxide powder is 10%, and the weight ratio of carbon nanotubes modified by active zinc manganese oxide coating is 10%; the thickness of the coalesced filling layer 5 is 2 mm;

[0116] The fourth layer is a hydrophobic and oleophilic modified PP meltblown cloth with a filtration pore size of 5um and a gram weight of 40g;

[0117] The fifth layer is a separation filling layer 7, in which the weight ratio of hydrophobic and lipophilic modified glass microbeads is 90%, the weight ratio of active manganese oxide powder is 5%, and the weight ratio of carbon nanotubes modified by active zinc oxide manganese coating is 5%; the thickness of the separation filling layer 7 is 2 mm;

[0118] The sixth layer is hydrophobic and oleophilic modified PP meltblown cloth with a filtration pore size of 5um and a gram weight of 40g;

[0119] The seventh layer is a hydrophilic and lipophilic modified polyester filter cloth with a filtration pore size of 10um and a gram weight of 100g.

[0120] Original liquid: Daqing ZBC3516 level 2 fourth section release spray liquid.

[0121] Table 2 Comparison of produced water before and after treatment in Daqing Oilfield fracturing

[0122]

[0123]

[0124] It can be clearly concluded from Table 2 that the filter material of the present invention has an oil-water separation demulsification effect for different types of samples, which further proves that the effect of the present application is good and can be used in industrial production.

[0125] The above description is only the preferred embodiment of the present invention, which does not limit the protection scope of the present invention. For those skilled in the art, the present invention can be modified and varied in various ways. Within the spirit and principle of the present invention, any change, modification, replacement, integration and parameter change of these embodiments by conventional substitution or capable of achieving the same function without departing from the principle and spirit of the present invention shall fall within the protection scope of the present invention.

Claims

1. A demulsifying filter material for oil-water separation, characterized in that: It comprises a support layer (1), a coalescing layer (2) and a separation layer (3), wherein the coalescing layer (2) and the separation layer (3) are alternately distributed in the support layer (1); The coalescing layer (2) comprises a coalescing filling layer (5) and a hydrophilic-lipophilic modified filter cloth (4); the coalescing filling layer (5) is located between two hydrophilic-lipophilic modified filter cloths (4); The separation layer (3) comprises a separation filling layer (7) and a hydrophobic and lipophilic modified filter cloth (6); the separation filling layer (7) is located between two hydrophobic and lipophilic modified filter cloths (6); The agglomerated filling layer (5) comprises hydrophilic-lipophilic modified glass microspheres, active manganese oxide powder and carbon nanotubes modified by manganese oxide zinc coating; the weight ratio of the hydrophilic-lipophilic modified glass microspheres is between 60% and 90%, the weight ratio of the active manganese oxide powder is between 5% and 20%, and the weight ratio of the carbon nanotubes modified by manganese oxide zinc coating is between 5% and 20%; The separation filling layer (7) comprises hydrophobic and oleophilic modified glass microspheres, vacant manganese oxide powder and carbon nanotubes modified by a manganese zinc oxide coating; the weight ratio of the hydrophobic and oleophilic modified glass microspheres is between 80% and 90%, the weight ratio of the vacant manganese oxide powder is between 5% and 10%, and the weight ratio of the carbon nanotubes modified by a manganese zinc oxide coating is between 5% and 10%.

2. The demulsifying filter material for oil-water separation according to claim 1, characterized in that: The diameter of the hydrophilic-lipophilic modified glass microspheres is 30-50 μm.

3. The demulsifying filter material for oil-water separation according to claim 1, characterized in that: The diameter of the hydrophobic and lipophilic modified glass microspheres is 30 to 50 μm.

4. The demulsifying filter material for oil-water separation according to claim 1, characterized in that: The filtration pore size of the hydrophilic-lipophilic modified filter cloth (4) is 5 to 15 μm.

5. The demulsifying filter material for oil-water separation according to claim 1, characterized in that: The filtration pore size of the hydrophobic and oleophilic modified filter cloth (6) is 5 to 15 μm.

6. The demulsifying filter material for oil-water separation according to claim 1, characterized in that: A PP melt-blown non-woven fabric is also provided between the coalescence filling layer (5) and the hydrophilic-lipophilic modified filter cloth (4); and a PP melt-blown non-woven fabric is also provided between the separation filling layer (7) and the hydrophobic-lipophilic modified filter cloth (6).

7. The demulsifying filter material for oil-water separation according to claim 1, characterized in that: Short fibers are also added to the coalescence filling layer (5) and the separation filling layer (7), and the volume mixing ratio of the short fibers to other materials in the coalescence filling layer (5) or the separation filling layer (7) is 5:1 to 10:1; The short fibers are carbon fibers or other synthetic fibers; The length of the short fibers is 0.2 to 0.5 mm, and the diameter is 5 to 10 um.

8. A method for preparing a demulsified filter material for oil-water separation according to claims 1-7, characterized in that: These include; S101, mixing hydrophilic and lipophilic modified glass microspheres, active manganese oxide powder and carbon nanotubes modified with manganese zinc oxide coating in proportion to form an agglomerated filling layer (5), and adding short fibers as needed; S102, placing the coalescing filling layer (5) between two hydrophilic and lipophilic modified filter cloths (4) to form a coalescing layer (2), and arranging a PP meltblown nonwoven fabric between the coalescing filling layer (5) and the hydrophilic and lipophilic modified filter cloths (4) as required; S103, mixing the hydrophobic and oleophilic modified glass microbeads, the vacancy manganese oxide powder and the carbon nanotubes modified with the manganese zinc oxide coating in proportion to form a separation filling layer (7), and adding short fibers as needed; S104, placing the separation filling layer (7) between two hydrophobic and oleophilic modified filter cloths (6) to form a separation layer (3), and arranging a PP melt-blown non-woven fabric between the separation filling layer (7) and the hydrophobic and oleophilic modified filter cloths (6) as required; S105, the coalescing layer (2) and the separation layer (3) are alternately distributed and placed in the support layer to form a demulsified filter material for oil-water separation.

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