Nanofiltration roll type membrane component

Abstract

The utility model relates to a nanofiltration roll-type membrane component, which belongs to the technical field of solvent-resistant nanofiltration membranes and comprises a central tube, a liquid collecting hole is arranged on the central tube, a nanofiltration membrane structure surrounds the outer side of the central tube, a sealing end cover is arranged at the front end of the nanofiltration membrane structure, and a concentrated liquid outlet and a filtrate outlet are arranged at the rear end of the nanofiltration membrane structure. An open end cover integrally connected with the sealing end cover is arranged on the side surface of the nanofiltration membrane structure, and a liquid inlet is formed in the other side, opposite to the open end cover, of the nanofiltration membrane structure. The utility model aims to provide the nanofiltration roll-type membrane component which is capable of feeding liquid from the side surface and is large in solvent flux.

Description

Technical Field

[0001] The utility model relates to the technical field of solvent-resistant nanofiltration membranes, in particular to a nanofiltration roll-type membrane component. Background Art

[0002] Nanofiltration membranes can be widely used in the concentration, purification and separation of small organic molecules, such as amino acids, organic pollutants, pesticides, etc. Due to its rich surface charge, it can selectively separate ions and soften water. In addition, most nanofiltration membranes are made of organic polymers, which are not resistant to solvents. Therefore, in most cases, the industrial application of nanofiltration membranes is limited to aqueous solutions. Chemical pharmaceutical processes are usually carried out in organic solvent systems. The active ingredients of drugs need to be separated from the reaction system after organic synthesis. Traditional distillation methods consume a lot of energy and may inactivate the products during heating. Solvent-resistant nanofiltration membranes made of organic solvent-resistant materials have potential value in separating active molecules from solvents in the pharmaceutical industry. It can reduce energy consumption and the generation of solvent waste, while increasing the yield of active ingredients, and is likely to replace traditional distillation methods. At present, the common nanofiltration membrane device has liquid inlet at one end and liquid outlet at the other end, and the solvent flux is small.

[0003] CN208389792U discloses a utility model which provides a nanofiltration membrane device, including a central tube, a guide net, a plurality of water production nets and a plurality of membrane layer groups; the guide net surrounds and covers the outside of the central tube; the water production net surrounds and covers the outside of the central tube and is arranged between the guide net and the central tube; a membrane layer group is arranged between each two adjacent water production nets, and the membrane layer group surrounds and covers the outside of the central tube; the membrane layer group includes a nanofiltration membrane and a water inlet net, the nanofiltration membrane is folded in half along the axial direction of the central tube, and the water inlet net is arranged between the two folded surfaces of the nanofiltration membrane; the nanofiltration membrane is sealed and glued between the two sides of the adjacent water production net and the side away from the connecting part of the guide net and the central tube; the guide net is sealed and glued between the two sides of the adjacent water production net and the side away from the connecting part of the guide net and the central tube. It can fully filter and concentrate water, but there is a problem of small solvent flux.

[0004] Therefore, finding a nanofiltration roll membrane component with a large solvent flux is a problem that needs to be solved at present. Summary of the invention

[0005] The utility model aims to provide a nanofiltration roll-type membrane component with large solvent flux.

[0006] The above technical problems are solved by the following technical solutions: a nanofiltration roll membrane component, comprising a central tube, a liquid collecting hole is provided on the central tube, a nanofiltration membrane structure is surrounded on the outside of the central tube, a sealing end cover is provided at the front end of the nanofiltration membrane structure, a concentrated liquid outlet and a filtered liquid outlet are provided at the rear end of the nanofiltration membrane structure, an open end cover is provided on the side of the nanofiltration membrane structure which is integrally connected with the sealing end cover, and a liquid inlet is provided on the other side of the nanofiltration membrane structure opposite to the open end cover.

[0007] The solvent enters the nanofiltration membrane structure from the liquid inlet arranged on the side of the nanofiltration membrane structure, which increases the membrane surface area in contact with the solvent and the nanofiltration membrane. The nanofiltration membrane structure is rolled into a multi-layer structure around the central tube. The solvent is filtered through the multi-layer nanofiltration membrane structure, which enhances the filtration effect. The nanofiltration effect is good. The retained part of the solvent that has not passed through the nanofiltration membrane flows out through the gap between the two adjacent nanofiltration membranes. The substances that have not been intercepted by the solvent pass through the nanofiltration membrane into the area sealed by the two membranes and then enter the central tube through the liquid collecting hole and flow out from the concentrated liquid outlet.

[0008] Preferably, the liquid collecting holes are arranged equidistantly in the axial direction of the central tube.

[0009] Preferably, one end of the central tube is sealed with the sealing end cover, and the other end of the central tube is provided with the concentrated liquid outlet.

[0010] Preferably, one end of the nanofiltration membrane structure is connected to the central tube, and the other end of the nanofiltration membrane structure is provided with a sealing belt.

[0011] Preferably, the liquid collecting holes are circular holes with a diameter of 2-5 mm, and the distance between two adjacent liquid collecting holes is 10-30 mm.

[0012] Preferably, the nanofiltration membrane structure consists of two outer nanofiltration membranes and a guide cloth between the two nanofiltration membranes, and the guide cloth is in the same direction as the two nanofiltration membranes.

[0013] Preferably, a supporting spacer is provided on the upper surface of the nanofiltration membrane structure to solve the problem of the membrane's tolerance under strong force and high pressure, and the extended mesh hole spacing will not change due to pressure changes.

[0014] Preferably, the liquid collection hole is located between the connection between the two layers of the nanofiltration membrane and the central tube.

[0015] Preferably, the filtrate outlet is an interlayer gap formed by the nanofiltration membrane structure and away from the sealing end cover side.

[0016] Preferably, the pore size of the nanofiltration membrane is 0.9-2.0 nm, and the thickness of the nanofiltration membrane is 100-300 μm.

[0017] The beneficial effects of the utility model are:

[0018] The solvent enters the nanofiltration membrane structure from the liquid inlet arranged on the side of the nanofiltration membrane structure, which increases the membrane surface area where the solvent and the nanofiltration membrane are in contact. The nanofiltration membrane structure is rolled into a multi-layer structure around the central tube. The solvent is filtered through the multi-layer nanofiltration membrane structure, which enhances the filtration effect and has a good nanofiltration effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of a nanofiltration roll membrane structure.

[0020] Figure 2 It is a schematic diagram of the structure of a nanofiltration roll membrane component.

[0021] In the figure, 1. central tube, 2. nanofiltration membrane structure, 2-1. nanofiltration membrane, 2-2. flow guide cloth, 3. liquid collecting hole, 4. sealing end cover, 5. open end cover, 6. sealing belt, 7. liquid inlet, 8. concentrated liquid outlet, 9. filtered liquid outlet. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0023] Example 1

[0024] like Figure 1 A nanofiltration roll membrane component shown includes a central tube 1 and a nanofiltration membrane structure 2 surrounding the side of the central tube 1, the nanofiltration membrane structure 2 includes two outer nanofiltration membranes 2-1 and a guide cloth 2-2 arranged between the two nanofiltration membranes 2-1, the nanofiltration membrane 2-1 is made of a polypropylene (PP) / polyethylene (PE) blended solvent-resistant nanofiltration membrane, the PP / PE blended nanofiltration membrane has high mechanical strength and chemical corrosion resistance, so that it can cope with complex chemical environments, and the PP / PE blended nanofiltration membrane can effectively intercept pollutants, reduce pollutant content, and improve water quality. At the same time, due to its good permeability, it can efficiently treat a large amount of wastewater. The bottom surfaces of the support layers of the two nanofiltration membranes 2-1 are stacked with a relative offset of 2 cm, and the guide cloth 2-2 is arranged between the two nanofiltration membranes 2-1. The guide cloth 2-2 is placed parallel to the two nanofiltration membranes 2-1. The guide cloth 2-2 is made of PE material. The PE material has excellent low temperature resistance, good chemical stability, high rigidity and toughness, and good mechanical strength. The PE material is non-toxic, has good water resistance and chemical resistance, and has low water absorption. PE is used as a guide cloth material and is very suitable for applications in liquid filtration and conduction. The PE guide cloth can efficiently filter out impurities in the liquid, and due to its good permeability and conductivity, it can quickly transfer the liquid from the surface to the lower material to ensure uniform distribution and efficient absorption of the liquid. The pore size of the two nanofiltration membranes 2-1 is 0.9 nm, and the thickness of the nanofiltration membrane 2-1 is 150 microns.

[0025] The nanofiltration membrane 2-1 is connected to the central tube 1 on one side, and the nanofiltration membrane 2-1 is connected to the two ends of one side of the central tube 1. The two ends of the two nanofiltration membranes 2-1 are welded to the central tube 1 by ultrasonic welding. The central tube is provided with 8 equally spaced liquid collection holes 3, the liquid collection holes are circular holes with a diameter of 3 mm, and the distance between two adjacent liquid collection holes is 15 mm. The two nanofiltration membranes 2-1 are welded on both sides of the liquid collection holes by ultrasonic welding. A soluble polytetrafluoroethylene (PFA) spacer is placed in the nanofiltration membrane structure 2 as a nanofiltration membrane medium support to solve the tolerance problem of the nanofiltration membrane under strong force and high pressure, and its extended mesh hole spacing will not change due to pressure changes. It can be understood that one end of the nanofiltration membrane structure 2 is connected to the central tube 1, and the two nanofiltration membranes 2-2 are placed on both sides of the liquid collection holes 3 on the central tube 1. The nanofiltration membrane structure 2 is rolled around the central tube 1, and the nanofiltration membrane structure 2-2 is tightly rolled on the central tube 1. Two adjacent layers of the nanofiltration membrane structures 2-2 form a gap.

[0026] Example 2

[0027] like Figure 2 A nanofiltration roll membrane component is shown, comprising a central tube 1 and a nanofiltration membrane structure 2 surrounding the side of the central tube 1, wherein the nanofiltration membrane structure 2 comprises two outer nanofiltration membranes 2-1 and a guide cloth 2-2 arranged between the two nanofiltration membranes 2-1, wherein the nanofiltration membrane 2-1 is made of a PP / PE blended solvent-resistant nanofiltration membrane, which has high mechanical strength and chemical corrosion resistance, enabling it to cope with complex chemical environments, and the PP / PE blended nanofiltration membrane can effectively intercept pollutants, reduce the content of pollutants, and improve the quality of effluent. At the same time, due to its good permeability, it can efficiently treat a large amount of wastewater. The bottom surfaces of the support layers of the two nanofiltration membranes 2-1 are stacked with a relative offset of 2 cm, and the guide cloth 2-2 is arranged between the two nanofiltration membranes 2-1, and the guide cloth 2-2 is placed parallel to the two nanofiltration membranes 2-1, and the guide cloth 2-2 is made of PE material, which has excellent low temperature resistance, good chemical stability, high rigidity and toughness, and good mechanical strength. PE material is non-toxic, has good water and chemical resistance, and has low water absorption. PE is used as a guide cloth material and is very suitable for liquid filtration and conduction applications. PE guide cloth can efficiently filter out impurities in the liquid. At the same time, due to its good permeability and conductivity, it can quickly transfer the liquid from the surface to the underlying material to ensure uniform distribution and efficient absorption of the liquid. The pore size of the two nanofiltration membranes 2-1 is 1.5nm, and the thickness of the nanofiltration membrane 2-1 is 200 microns.

[0028] The nanofiltration membrane 2-1 is connected to the central tube 1 on one side, and the nanofiltration membrane 2-1 is connected to the two ends of one side of the central tube 1. The two ends of the two nanofiltration membranes 2-1 are welded to the central tube 1 by ultrasonic welding. The central tube is provided with 8 equally spaced liquid collection holes 3, the liquid collection holes are circular holes with a diameter of 4 mm, and the distance between two adjacent liquid collection holes is 20 mm. The two nanofiltration membranes 2-1 are welded on both sides of the liquid collection holes by ultrasonic welding. A soluble polytetrafluoroethylene (PFA) spacer is placed in the nanofiltration membrane structure 2 as a nanofiltration membrane medium support to solve the tolerance problem of the nanofiltration membrane under strong force and high pressure, and its extended mesh hole spacing will not change due to pressure changes. It can be understood that one end of the nanofiltration membrane structure 2 is connected to the central tube 1, and the two nanofiltration membranes 2-2 are placed on both sides of the liquid collection holes 3 on the central tube 1. The nanofiltration membrane structure 2 is rolled around the central tube 1, and the nanofiltration membrane structure 2-2 is tightly rolled on the central tube 1. Two adjacent layers of the nanofiltration membrane structures 2-2 form a gap.

[0029] The other side of the nanofiltration membrane 2 - 1 is connected to a sealing belt 6 , which plays a role in protecting the nanofiltration membrane and reversing the solvent. A sealing portion is provided at the edge of the sealing belt 6 .

[0030] The front end of the nanofiltration membrane structure 2 is connected to a sealing end cover 4, and the sealing end cover 4 seals the front end of the nanofiltration membrane structure 2-2. The sealing end cover 4 seals one end of the central tube 1. The side of the nanofiltration membrane structure is connected to an open end cover 5, and one end of the open end cover 5 is integrally connected to the sealing end cover 5. The open end cover 5 is semi-cylindrical, and the open end cover 5 completely covers one side of the nanofiltration membrane structure 2. The nanofiltration membrane structure 2 is provided with a liquid inlet 5 on the other side relative to the open end cover 5. A large amount of solvent can be introduced into the liquid inlet 5. Under the guiding effect of the sealing belt 6, the solvent enters the nanofiltration membrane structure 2. The other end of the nanofiltration membrane structure 2 is provided with a filtrate outlet 9, and the filtrate outlet 9 is composed of multiple layers of gaps of the nanofiltration membrane structure 2. The outlet of the end of the central tube 1 away from the sealing end cover 4 is a concentrated liquid outlet 8, and the concentrated liquid outlet 8 is located at the center of the filtrate outlet 9. The solvent is filtered through the multi-layer nanofiltration structure of the nanofiltration membrane structure 2, which enhances the filtering effect and has a good nanofiltration effect. The solvent does not pass through the retained part of the nanofiltration membrane structure 2 and flows out through the filtrate outlet 9. The substances not intercepted by the solvent pass through the nanofiltration membrane structure 2 into the area sealed by the two nanofiltration membranes and then enter the central tube 1 through the liquid collecting hole 3 for aggregation, and then flow out from the concentrated liquid outlet 8.

[0031] Example 3

[0032] A nanofiltration roll membrane component includes a central tube 1 and a nanofiltration membrane structure 2 surrounding the side of the central tube 1, the nanofiltration membrane structure 2 includes two outer nanofiltration membranes 2-1 and a guide cloth 2-2 arranged between the two nanofiltration membranes 2-1, the nanofiltration membrane 2-1 is made of a PP / PE blended solvent-resistant nanofiltration membrane, the PP / PE blended nanofiltration membrane has high mechanical strength and chemical corrosion resistance, so that it can cope with complex chemical environments, and the PP / PE blended nanofiltration membrane can effectively intercept pollutants, reduce the content of pollutants, and improve the quality of effluent. At the same time, due to its good permeability, it can efficiently treat a large amount of wastewater. A supporting spacer is provided on the upper surface of the nanofiltration membrane structure 2. The problem of the tolerance of the nanofiltration membrane under strong force and high pressure is solved, and the hole spacing of the extended mesh will not change due to pressure changes. The bottom surfaces of the support layers of the two nanofiltration membranes 2-1 are stacked with a relative offset of 2 cm, and the guide cloth 2-2 is arranged between the two nanofiltration membranes 2-1. The guide cloth 2-2 is placed parallel to the two nanofiltration membranes 2-1. The guide cloth 2-2 is made of PE material. The PE material has excellent low temperature resistance, good chemical stability, high rigidity and toughness, and good mechanical strength. PE material is non-toxic, has good water resistance and chemical resistance, and has low water absorption. PE is used as a guide cloth material and is very suitable for applications in liquid filtration and conduction. The PE guide cloth can efficiently filter out impurities in the liquid, and due to its good permeability and conductivity, it can quickly transfer the liquid from the surface to the lower material to ensure uniform distribution and efficient absorption of the liquid. The pore size of the two nanofiltration membranes 2-1 is 2.0 nm, and the thickness of the nanofiltration membrane 2-1 is 300 microns.

[0033] The nanofiltration membrane 2-1 is connected to the central tube 1 on one side, and the nanofiltration membrane 2-1 is connected to the two ends of one side of the central tube 1. The two ends of the two nanofiltration membranes 2-1 are welded to the central tube 1 by ultrasonic welding. The central tube is provided with 8 equally spaced liquid collection holes 3, the liquid collection holes are circular holes with a diameter of 5 mm, and the distance between two adjacent liquid collection holes is 30 mm. The two nanofiltration membranes 2-1 are welded on both sides of the liquid collection holes by ultrasonic welding. A soluble polytetrafluoroethylene (PFA) spacer is placed in the nanofiltration membrane structure 2 as a nanofiltration membrane medium support to solve the tolerance problem of the nanofiltration membrane under strong force and high pressure, and its extended mesh hole spacing will not change due to pressure changes. It can be understood that one end of the nanofiltration membrane structure 2 is connected to the central tube 1, and the two nanofiltration membranes 2-2 are placed on both sides of the liquid collection holes 3 on the central tube 1. The nanofiltration membrane structure 2 is rolled around the central tube 1, and the nanofiltration membrane structure 2-2 is tightly rolled on the central tube 1. Two adjacent layers of the nanofiltration membrane structures 2-2 form a gap.

[0034] The other side of the nanofiltration membrane 2 - 1 is connected to a sealing belt 6 , which plays a role in protecting the nanofiltration membrane and reversing the solvent. A sealing portion is provided at the edge of the sealing belt 6 .

[0035] The front end of the nanofiltration membrane structure 2 is connected to a sealing end cover 4, and the sealing end cover 4 seals the front end of the nanofiltration membrane structure 2-2. The sealing end cover 4 seals one end of the central tube 1. The side of the nanofiltration membrane structure is connected to an open end cover 5, and one end of the open end cover 5 is integrally connected to the sealing end cover 5. The open end cover 5 is semi-cylindrical, and the open end cover 5 completely covers one side of the nanofiltration membrane structure 2. The nanofiltration membrane structure 2 is provided with a liquid inlet 5 on the other side relative to the open end cover 5. A large amount of solvent can be introduced into the liquid inlet 5. Under the guiding effect of the sealing belt 6, the solvent enters the nanofiltration membrane structure 2. The other end of the nanofiltration membrane structure 2 is provided with a filtrate outlet 9, and the filtrate outlet 9 is composed of multiple layers of gaps of the nanofiltration membrane structure 2. The outlet of the end of the central tube 1 away from the sealing end cover 4 is a concentrated liquid outlet 8, and the concentrated liquid outlet 8 is located at the center of the filtrate outlet 9. The solvent is filtered through the multi-layer nanofiltration structure of the nanofiltration membrane structure 2, which enhances the filtering effect and has a good nanofiltration effect. The solvent does not pass through the retained part of the nanofiltration membrane structure 2 and flows out through the filtrate outlet 9. The substances not intercepted by the solvent pass through the nanofiltration membrane structure 2 into the area sealed by the two nanofiltration membranes and then enter the central tube 1 through the liquid collecting hole 3 for aggregation, and then flow out from the concentrated liquid outlet 8.

[0036] The nanofiltration roll membrane component of the utility model has the advantages of reasonable structure, stable performance, and easy operation. By adopting the solvent-resistant nanofiltration membrane of PP / PE blend and the guide cloth of PE material, the nanofiltration membrane element has excellent chemical corrosion resistance, high mechanical strength and good permeability. At the same time, by designing a unique nanofiltration membrane structure and supporting structure, the nanofiltration membrane element can still maintain stable operation under high pressure, forming a filtrate flow channel and an intercepted liquid flow channel, and realizing nanofiltration separation in the system. By adopting the side liquid inlet method, the surface area of ​​the nanofiltration membrane is increased and the solvent flux is improved. Therefore, the nanofiltration roll membrane component of the utility model has broad application prospects in the fields of chemical wastewater treatment, liquid separation and purification.

[0037] The above description is only a preferred embodiment of the present invention and does not constitute any limitation to the present invention. Any simple modification, change and equivalent transformation made to the above embodiments according to the technical essence of the present invention shall still fall within the protection scope of the technical solution of the present invention.

Claims

1. A nanofiltration rolled membrane component, characterized in that: It comprises a central tube, which is provided with a liquid collecting hole, a nanofiltration membrane structure surrounding the side of the central tube, a sealing end cover is provided at the front end of the nanofiltration membrane structure, a concentrated liquid outlet and a filtered liquid outlet are provided at the rear end of the nanofiltration membrane structure, an open end cover integrally connected to the sealing end cover is provided on the side of the nanofiltration membrane structure, and a liquid inlet is provided on the other side of the nanofiltration membrane structure opposite to the open end cover.

2. A nanofiltration rolled membrane component according to claim 1, characterized in that: The liquid collecting holes are arranged equidistantly in the axial direction of the central tube.

3. A nanofiltration rolled membrane component according to claim 1, characterized in that: One end of the central tube is sealed with the sealing end cover, and the other end of the central tube is provided with the concentrated liquid outlet.

4. The nanofiltration rolled membrane component according to claim 1, characterized in that: One end of the nanofiltration membrane structure is connected to the central tube, and the other end of the nanofiltration membrane structure is provided with a sealing belt.

5. A nanofiltration rolled membrane component according to claim 1 or 4, characterized in that: The liquid collecting holes are circular holes with a diameter of 2-5 mm, and the distance between two adjacent liquid collecting holes is 10-30 mm.

6. A nanofiltration rolled membrane component according to claim 1 or 4, characterized in that: The nanofiltration membrane structure is composed of two outer nanofiltration membranes and a guide cloth located between the two nanofiltration membranes, and the guide cloth is in the same direction as the two nanofiltration membranes.

7. A nanofiltration rolled membrane component according to claim 6, characterized in that: A supporting screen is arranged on the upper surface of the nanofiltration membrane structure.

8. The nanofiltration rolled membrane component according to claim 6, characterized in that: The liquid collecting hole is located between the connection between the two nanofiltration membranes and the central tube.

9. The nanofiltration rolled membrane component according to claim 1, characterized in that: The filtrate outlet is an interlayer gap formed by the nanofiltration membrane structure and away from the sealing end cover side.

10. The nanofiltration rolled membrane component according to claim 6, characterized in that: The pore size of the nanofiltration membrane is 0.9-2.0 nm, and the thickness of the nanofiltration membrane is 100-300 μm.

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