Equipment for online evaluation of nanofiltration membrane skin solid property

Abstract

The utility model provides equipment for evaluating the skin solid property of a nanofiltration membrane on line, and belongs to the technical field of nanofiltration membrane performance evaluation equipment. Comprising a water tank, first dye spraying equipment, first washing equipment, first online defect detection equipment, an extrusion module, second dye spraying equipment, second washing equipment and second online defect detection equipment which are arranged in sequence. According to the utility model, a method for evaluating the skin solid property of the nanofiltration membrane on line is used for producing the nanofiltration membrane, so that continuous and automatic production equipment can be provided, the cost can be saved and the process can be simplified by evaluating the skin solid property of the surface of the nanofiltration membrane on line, and meanwhile, continuous and stable amplification can be realized, and a flat nanofiltration membrane with stable performance can be prepared.

Description

Technical Field

[0001] The utility model relates to the technical field of nanofiltration membrane performance evaluation equipment, in particular to an online device for evaluating the nanofiltration membrane durability, which can quickly and accurately evaluate the membrane material durability and save production costs. Background Art

[0002] Membrane technology has become a new type of separation technology, and its demand in the water treatment industry is becoming increasingly urgent. Nanofiltration membrane is a low-pressure driven membrane between reverse osmosis and ultrafiltration, and was previously called loose reverse osmosis membrane. Its pore size range is 0.5-2nm, and its molecular weight cutoff (MWCO) is 100-2000Da. Nanofiltration membrane has a certain retention capacity for multivalent ions or small organic molecules, allowing monovalent ions or water molecules to pass through, thereby achieving separation between monovalent and multivalent ions and separation between different small organic molecules. Nanofiltration membrane is a separation process driven by the pressure difference on both sides of the membrane. Its separation mechanism is very complex and there is no clear theoretical explanation so far. At present, most researchers believe that the separation efficiency in the nanofiltration membrane separation process is mainly the result of the synergistic effect of steric hindrance and charge effect. Due to the advantages of low operating pressure, high permeability and selectivity of nanofiltration membrane, it has been widely used in high-quality water supply, lithium extraction from salt lakes, biomedical separation and purification, and zero discharge of industrial wastewater.

[0003] In recent years, the research and development of nanofiltration membranes has been very rapid. Given that most commercial nanofiltration membranes in the current market are rolled nanofiltration membranes, which are then cast by adding pure water and concentrated water flow cloth. During the production process of flat nanofiltration membranes, it is necessary to test the durability of the membrane as an important criterion for measuring the performance of the membrane. The traditional evaluation method is to remove the rolled membrane and then rub it by hand. This method is inefficient and cannot quickly feedback the production system. At the same time, it is difficult to accurately determine the durability of the membrane material due to different wiping strengths.

[0004] Commercial composite nanofiltration membranes mainly include non-woven fabrics, base membranes and separation layers. The strength of the separation layer and base membrane is a direct factor affecting the durability of the nanofiltration membrane. The existing durability evaluation method is to remove the membrane after winding and perform initial dyeing for one minute, and then hand-rub the dyeing for one minute. This evaluation method is not efficient and reliable, and has low production responsiveness. The durability and integrity of nanofiltration membranes and reverse osmosis membranes have a significant impact on the subsequent use of membrane materials. Given that the existing method for evaluating the durability of flat nanofiltration membranes is mainly based on hand-rubbing and dyeing the membrane after winding, online real-time evaluation is rare. Utility Model Content

[0005] The utility model aims to provide a device for online evaluation of nanofiltration membrane durability, so as to solve at least one technical problem existing in the above-mentioned background technology.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] The utility model provides a device for online evaluation of nanofiltration membrane skin toughness, comprising: the device for online evaluation of nanofiltration membrane skin toughness, comprising:

[0008] A water tank, a first dye spraying device, a first rinsing device, a first online defect detection device, an extrusion module, a second dye spraying device, a second rinsing device, and a second online defect detection device are sequentially arranged;

[0009] Wherein, the first dye spraying device and the second dye spraying device both comprise: a dye reserve box and a dye spraying pipe connected to the dye reserve box;

[0010] The first flushing device and the second flushing device both include: a water storage tank and a flushing pipe connected to the water storage tank;

[0011] The first online defect detection device and the second online defect detection device both include: a support frame, an online scanner arranged on the top of the support frame, and the online scanner is connected to a control cabinet.

[0012] Optionally, the extrusion module is a friction resistance testing machine ZJ-339-GSR II.

[0013] Optionally, the first online defect detection device and the second online defect detection device are both CX-Vision detection systems.

[0014] The beneficial effects of the utility model are as follows: the online evaluation method of nanofiltration membrane surface toughness is used in nanofiltration membrane production, which not only provides a continuous and automated production equipment, but also the online evaluation of the surface toughness of the nanofiltration membrane is conducive to cost saving and process simplification, and at the same time can achieve continuous and stable amplification to prepare a flat nanofiltration membrane with stable performance.

[0015] Additional aspects and advantages of the present invention will be partially given in the following description, which will become apparent from the following description or be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 This is a structural diagram of the equipment for online evaluation of nanofiltration membrane durability described in an embodiment of the utility model.

[0018] Figure 2This is a structural diagram of the online defect detection equipment described in an embodiment of the utility model.

[0019] Among them: 1-water tank; 2-first dye spraying equipment; 3-first flushing equipment; 4-first online defect detection equipment; 5-extrusion module; 6-second dye spraying equipment; 7-second flushing equipment; 8-second online defect detection equipment; 9-support frame; 10-online scanner; 11-control cabinet. DETAILED DESCRIPTION

[0020] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below by the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be interpreted as limiting the present invention.

[0021] Those skilled in the art will understand that, unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meaning as generally understood by those skilled in the art to which the present invention belongs.

[0022] It should also be understood that terms, such as those defined in commonly used dictionaries, should be understood to have a meaning consistent with that in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless as defined herein.

[0023] Those skilled in the art will appreciate that, unless otherwise stated, the singular forms "a", "an", "said" and "the" used herein may also include plural forms. It should be further understood that the term "comprising" used in the specification of the present utility model refers to the presence of the features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements and / or groups thereof.

[0024] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples, unless they are contradictory.

[0025] In the description of this specification, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0026] In the description of this specification, the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present technology and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present technology.

[0027] Unless otherwise clearly specified or limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense, for example, they can be fixedly connected or set, or detachably connected or set, or integrally connected or set. For ordinary technicians in this field, the specific meanings of the above terms in this technology can be understood according to specific circumstances.

[0028] To facilitate the understanding of the present invention, the present invention is further explained below with reference to specific embodiments in conjunction with the accompanying drawings, and the specific embodiments do not constitute a limitation on the embodiments of the present invention.

[0029] Those skilled in the art should understand that the drawings are merely schematic diagrams of embodiments, and the components in the drawings are not necessarily necessary for implementing the present invention.

[0030] Example

[0031] like Figure 1 to Figure 2 As shown, in this embodiment, an online device for evaluating the durability of a nanofiltration membrane is provided, comprising: a water tank 1, a first dye spraying device 2, a first flushing device 3, a first online defect detection device 4, an extrusion module 5, a second dye spraying device 6, a second flushing device 7 and a second online defect detection device 8 arranged in sequence; wherein, the first dye spraying device 2 and the second dye spraying device 6 both comprise: a dye storage box and a dye spraying pipe connected to the dye storage box; the first flushing device 3 and the second flushing device 7 both comprise: a water storage tank and a flushing pipe connected to the water storage tank; the first online defect detection device 4 and the second online defect detection device 8 both comprise: a support frame 9, an online scanner 10 arranged on the top of the support frame 9, and the online scanner 10 is connected to a control cabinet 11.

[0032] The equipment for online evaluation of nanofiltration membrane durability provided in this embodiment is mainly aimed at solving the problem of continuous production equipment and process of membrane materials and realizing online evaluation of nanofiltration membrane durability.

[0033] First, immerse the flat membrane in a water tank 1 for cleaning, then dye the membrane through the first dye spraying device 2, and rinse it with pure water after staying for a certain period of time with the first flushing device 3. The membrane is subsequently subjected to a preliminary defect detection by the first online defect detection device 4 to observe whether there are obvious defects on the surface of the membrane. After the first online defect detection device 4 detects that there are no obvious defects, the membrane passes through the extrusion module 5 (model: Zhijia Instrument Abrasion Tester, ZJ-339-GSR II) to remove residual dyes and moisture, and at the same time, the toughness of the membrane surface is investigated. By placing weights of different masses on the top of the extrusion roller to apply different forces to the surface of the membrane, and replacing materials of different roughness to adjust different reciprocating times and reciprocating speeds to squeeze the surface of the membrane to different degrees to simulate the degree of toughness of the membrane. In theory, the larger the weight, the rougher the material, the more reciprocating times, and the faster the reciprocating speed, the greater the friction on the surface of the membrane. Subsequently, the second dye spraying device 6 is used for dyeing and the second flushing device 7 is used for pure water flushing. At the same time, the second online defect detection device 8 is used to monitor the durability of the diaphragm online. The first online defect detection device 4 and the second online defect detection device 8 are both CX-Vision detection systems. In the first step, the system obtains the surface image of the diaphragm, and then divides the surface image of the diaphragm according to certain pixels. Then, by building an existing industry defect big data center in the cloud, the system can automatically classify and evaluate each defect according to image feature parameters such as defect size and shape. All detected defect data, such as defect images, size, registration and other defect information can be stored and displayed in the database, and data encryption is provided.

[0034] To summarize, the device for online evaluation of nanofiltration membrane durability described in the embodiment of the utility model is suitable for nanofiltration membrane production. Considering that most of the existing flat nanofiltration membranes on the market are rolled up and then manually rubbed and dyed for durability testing, this method has the problems of complicated process flow and high cost. The online evaluation method of nanofiltration membrane durability is used for nanofiltration membrane production. It can not only provide a continuous and automated production equipment, but also the online evaluation of nanofiltration membrane surface durability is conducive to cost saving and process simplification. At the same time, it can achieve continuous and stable amplification to prepare flat nanofiltration membranes with stable performance.

[0035] Although the above describes the specific implementation methods of the utility model in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the utility model. Technical personnel in the relevant field should understand that on the basis of the technical solution disclosed in the utility model, various modifications or deformations that can be made by technical personnel in this field without creative work should be included in the scope of protection of the utility model.

Claims

1. A device for online evaluation of nanofiltration membrane durability, characterized in that: include: A water tank (1), a first dye spraying device (2), a first rinsing device (3), a first online defect detection device (4), an extrusion module (5), a second dye spraying device (6), a second rinsing device (7) and a second online defect detection device (8) are arranged in sequence; Wherein, the first dye spraying device (2) and the second dye spraying device (6) both comprise: a dye storage box and a dye spraying pipe connected to the dye storage box; The first flushing device (3) and the second flushing device (7) both comprise: a water storage tank and a flushing pipe connected to the water storage tank; The first online defect detection device (4) and the second online defect detection device (8) both comprise: a support frame (9), an online scanner (10) arranged on the top of the support frame (9), and the online scanner (10) is connected to a control cabinet (11).

2. The device for online evaluation of nanofiltration membrane durability according to claim 1, characterized in that: The extrusion module (5) is a friction resistance testing machine ZJ-339-GSRII.

3. The device for online evaluation of nanofiltration membrane durability according to claim 1, characterized in that: The first online defect detection device (4) and the second online defect detection device (8) are both CX-Vision detection systems.

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