Filtering device for chemical digestion solution
By designing a filtration device combining a 0.15mm pore diameter polytetrafluoroethylene wire mesh filter membrane and a mesh diaphragm, the corrosion resistance and pore size problems of the digestive solution filter device in the chemical laboratory are solved, and a fast and safe filtration effect is achieved. And support the reuse of filter membrane.
Patent Information
- Application Number
- CN202420517086.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-18
- Publication Date
- 2024-12-13
- Estimated Expiration
- 2034-03-18
AI Technical Summary
The filter device used for digestion in chemical laboratories is highly corrosive, commonly used filter membranes cannot tolerate it, and the small pore size leads to clogging and spraying risks, affecting experimental safety and detection accuracy.
A filter device including the upper cylinder, the filter membrane and the lower cylinder is designed. The filter membrane is a 0.15mm pore diameter polytetrafluoroethylene wire mesh, located between the mesh upper diaphragm and the lower diaphragm, and is connected by threads to ensure high corrosion resistance. and appropriate aperture to prevent clogging.
The rapid and effective filtration of chemical digestion solution is achieved to prevent sample contamination and ejection, ensure the safety of the experiment, and the filter membrane can be detached and reused, reducing the risk to the experimenter.
Smart Images
Figure CN222151569U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of chemical laboratory equipment, and in particular relates to a filtering device for chemical digestion liquid. Background Art
[0002] The determination of inorganic elements in chemical laboratories requires sample digestion. Since many sample matrices have complex components, such as cosmetics and daily chemicals, the polymer materials and biological tissues they contain are difficult to completely decompose, resulting in unclear digestion solutions or insoluble matter being produced during dilution. When centrifugation is difficult to separate, filtration is required before determination. Otherwise, it is easy to cause blockage in the pipelines of precision detection equipment such as atomic absorption spectrophotometers or inductively coupled plasma mass spectrometers.
[0003] However, since strong acid is usually used for digestion, the digestion solution is extremely corrosive. Ordinary filter membranes and filter papers are not corrosion-resistant and cannot meet the requirements. Although pinhole polytetrafluoroethylene membranes are corrosion-resistant, the pore size of commonly used pinhole filter membranes is too small. Not only do they require syringe injection, but they are also prone to clogging. Due to the excessive internal pressure during the filtration process, it is easy to spray out, causing the risk of burns by strong acid to the experimenter. Utility Model Content
[0004] The utility model aims at the above-mentioned problems, makes up for the deficiencies of the prior art, and provides a filtering device for chemical digestion liquid; the utility model has high chemical stability and excellent chemical corrosion resistance, can withstand strong acids, prevent sample contamination, has low adsorption, ensures maximum sample recovery, and can quickly and effectively filter the digestion liquid.
[0005] To achieve the above purpose, the utility model adopts the following technical solutions.
[0006] The utility model provides a filtering device for chemical digestion liquid, comprising an upper cylinder, a filter membrane and a lower cylinder, characterized in that the upper cylinder is a cylindrical tube as a whole, a mesh upper diaphragm is arranged at the bottom end of the upper cylinder, the lower cylinder is a funnel-shaped as a whole, the upper part is a cylindrical tube, the lower part is closed and a guide tube is arranged, a mesh lower diaphragm is arranged in the lower cylinder, the upper cylinder is connected to the lower cylinder by threaded cooperation, the filter membrane is a circular polytetrafluoroethylene mesh, the mesh diameter of the filter membrane is 0.15mm, and the filter membrane is located between the mesh upper diaphragm and the mesh lower diaphragm.
[0007] Furthermore, the lower portion of the upper tube is provided with an external thread, and the upper portion of the lower tube is provided with an internal thread that matches the external thread of the upper tube.
[0008] Furthermore, the position of the mesh lower diaphragm in the lower cylinder is such that after the upper cylinder is connected to the lower cylinder, the mesh upper diaphragm is close to the mesh upper diaphragm, so that the mesh upper diaphragm and the mesh lower diaphragm can clamp the filter membrane.
[0009] Furthermore, the diameter of the filter membrane is the same as the diameter of the mesh lower diaphragm.
[0010] Furthermore, the upper tube and the lower tube are both transparent, and the side wall of the upper tube is provided with scales.
[0011] Furthermore, the upper tube and the lower tube are both made of polytetrafluoroethylene.
[0012] The beneficial effects of the utility model.
[0013] The utility model uses a polytetrafluoroethylene mesh with a pore size of 0.15mm as a filter membrane to filter the chemical digestion solution. The polytetrafluoroethylene mesh has a high chemical stability and excellent chemical corrosion resistance, can withstand strong acid, prevent sample contamination, has low adsorption, and ensures maximum sample recovery. The 0.15mm pore size is smaller than the inner diameter (0.4mm) of the limiting flow injection tube of the atomic absorption spectrophotometer or the inductively coupled plasma mass spectrometer atomizer, which is approximately equivalent to the pore size of the rapid quantitative filter paper, and can quickly and effectively filter the digestion solution. In addition, the polytetrafluoroethylene filter membrane can be disassembled, washed, and reused, and can also be replaced to prevent sample contamination or blockage that causes the digestion solution to spray out and cause harm to the experimenter. The upper and lower cylinders are threadedly connected, not easy to leak, and can be washed and reused. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] In order to make the technical problems, technical solutions and beneficial effects solved by the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be understood that the specific implementation methods described here are only used to explain the utility model and are not used to limit the utility model.
[0015] Figure 1 It is a schematic diagram of the overall exploded structure of the utility model.
[0016] Figure 2 It is a top view of the upper cylinder of the utility model.
[0017] Figure 3 It is a schematic diagram of the external structure of the utility model after overall assembly.
[0018] Markings in the figure: 1 is an upper cylinder, 2 is a filter membrane, 3 is a lower cylinder, 4 is a mesh upper diaphragm, 5 is a flow guide tube, 6 is a mesh lower diaphragm, 7 is an external thread, 8 is an internal thread, and 9 is a scale. DETAILED DESCRIPTION
[0019] As shown in the accompanying drawings, this embodiment provides a filtering device for chemical digestion liquid, including an upper cylinder 1, a filter membrane 2 and a lower cylinder 3.
[0020] The upper cylinder 1 is a transparent cylindrical tube as a whole and is made of polytetrafluoroethylene. The side wall of the upper cylinder 1 is provided with a scale 9 to facilitate observation and control of the volume of the outflowing liquid and to prevent the lower liquid receiving container from being replaced midway.
[0021] A mesh upper diaphragm 4 is arranged at the bottom end of the upper cylinder 1, and an external thread 7 is arranged at the lower part of the upper cylinder 1 for tightening with the lower cylinder 3 to clamp the filter membrane 2 in the middle.
[0022] The lower tube 3 is transparent funnel-shaped as a whole, made of polytetrafluoroethylene, and the upper part is a cylindrical tube, provided with an internal thread 8 matching the external thread 7 of the upper tube 1, for tightening with the upper tube 1. The lower part is closed and provided with a guide tube 5 to facilitate the outflow of the filtrate.
[0023] A mesh lower diaphragm 6 is provided in the lower cylinder 3 , and the position of the mesh lower diaphragm 6 in the lower cylinder 3 is such that after the upper cylinder 1 is connected to the lower cylinder 3 , it is close to the mesh upper diaphragm 4 , so that the mesh upper diaphragm 4 and the mesh lower diaphragm 6 can clamp the filter membrane 2 .
[0024] The filter membrane 2 is a circular polytetrafluoroethylene mesh, and its diameter is the same as that of the mesh lower diaphragm 6. The mesh diameter of the filter membrane 2 is 0.15 mm. The filter membrane 2 is located between the mesh upper diaphragm 4 and the mesh lower diaphragm 6, and is used to filter the chemical digestion solution, remove insoluble matter, and prevent clogging of the atomic absorption spectrophotometer or the inductively coupled plasma mass spectrometer nebulizer flow limiting injection tube. The filter membrane 2 is detachable and replaceable.
[0025] Here’s how to use it:
[0026] Before filtering, place the filter membrane 2 between the upper cylinder 1 and the lower cylinder 3, tighten the upper cylinder 1 and the lower cylinder 3, and place the device upright on the mouth of the test tube or centrifuge tube.
[0027] During filtration, the treated chemical digestion liquid is poured into the upper cylinder 1 and filtered naturally, and the filtrate flows along the lower guide pipe 5 into the lower external liquid receiving container.
[0028] After filtration, the upper cylinder 1 and the lower cylinder 3 can be loosened, the filter membrane 2 can be taken out, each part can be washed, soaked in acid overnight, and reused after being rinsed with purified water. If the filter membrane 2 is blocked or contaminated, the filter membrane 2 can be replaced to prevent sample contamination or damage to the experimenter caused by the spraying of the digestion solution due to blockage.
[0029] It can be understood that the above specific description of the utility model is only used to illustrate the utility model and is not limited to the technical solution described in the implementation mode of the utility model. Ordinary technicians in the field should understand that the utility model can still be modified or replaced by equivalents to achieve the same technical effect; as long as the use requirements are met, they are within the protection scope of the utility model.
Claims
1. A filtering device for chemical digestion liquid, comprising an upper cylinder (1), a filter membrane (2) and a lower cylinder (3), characterized in that: The upper cylinder (1) is in the shape of a cylindrical tube as a whole. A mesh upper diaphragm (4) is arranged at the bottom end of the upper cylinder (1). The lower cylinder (3) is in the shape of a funnel as a whole. The upper part is a cylindrical tube, and the lower part is closed and provided with a flow guide tube (5). A mesh lower diaphragm (6) is arranged in the lower cylinder (3). The upper cylinder (1) and the lower cylinder (3) are connected by threaded fitting. The filter membrane (2) is a circular polytetrafluoroethylene mesh. The mesh diameter of the filter membrane (2) is 0.15 mm. The filter membrane (2) is located between the mesh upper diaphragm (4) and the mesh lower diaphragm (6).
2. A filtering device for chemical digestion liquid according to claim 1, characterized in that: The lower portion of the upper cylinder (1) is provided with an external thread (7), and the upper portion of the lower cylinder (3) is provided with an internal thread (8) that matches the external thread (7) of the upper cylinder (1).
3. A filtering device for chemical digestion liquid according to claim 2, characterized in that: The position of the mesh lower diaphragm (6) in the lower cylinder (3) is such that after the upper cylinder (1) is connected to the lower cylinder (3), it is close to the mesh upper diaphragm (4), so that the mesh upper diaphragm (4) and the mesh lower diaphragm (6) can clamp the filter membrane (2).
4. A filtering device for chemical digestion liquid according to claim 3, characterized in that: The diameter of the filter membrane (2) is the same as the diameter of the mesh lower diaphragm (6).
5. A filtering device for chemical digestion solution according to claim 1, characterized in that: The upper cylinder (1) and the lower cylinder (3) are both transparent, and a scale (9) is provided on the side wall of the upper cylinder (1).
6. A filtering device for chemical digestion solution according to claim 1, characterized in that: The upper cylinder (1) and the lower cylinder (3) are both made of polytetrafluoroethylene.