Aqueous phase filtration membrane is one of the most commonly used membrane materials. A more serious problem is that the membrane dissolves during the filtration process. Since the membrane dissolves, it will cause pore size damage, pore changes, etc., which will cause filtrate contamination and affect the filtration efficiency and effect.

Why does the membrane dissolve? There are many factors that affect the integrity and stability of membrane materials, such as contact with chemicals incompatible with membrane materials, certain solvents, acids, bases or strong oxidants that degrade or dissolve membrane materials, causing them to decompose; high pH or low pH solutions, some membrane materials may swell when exposed to certain solvents, causing changes in the structure of the membrane and eventually dissolving, exposure to extreme temperatures will affect the integrity of the membrane material, high temperature will accelerate the chemical reaction of degrading the membrane, and low temperature will affect the flexibility and stability of the material, physical damage to the membrane (such as tearing, perforation or wear), low-quality or degraded membranes may be more easily dissolved, improper operation, etc.

What should be done if the membrane dissolves?
Through the above analysis, we can take targeted measures, such as selecting appropriate membrane materials, avoiding contact with incompatible chemicals, monitoring filtration conditions, and ensuring proper handling. This can be done in a few simple steps:
1. First, when the membrane dissolves during the filtration process, stop the filtration process immediately to prevent further contamination of the filtrate.
2. To handle the contaminated solution, membrane dissolution occurs, and the pore size and porosity of the membrane used have a great impact. In principle, the expected filtration effect cannot be achieved. Therefore, the solutions involved in the filtration process should be effectively distinguished to prevent any unexpected consequences or hazards.
3. Check the filtration device to determine the cause of the membrane dissolution, whether it is physical damage to the membrane caused by the machine itself, including pressure, tearing, impact, etc., and it may be due to incompatibility with the solvent, exposure to irritating chemicals, etc.
4. After confirming that the filtration device is completely normal, verify whether the appropriate membrane has been selected and whether the filtered solvent or solution is compatible with the filter membrane.
5. Check membrane compatibility to ensure that the selected filter membrane is chemically compatible with the solvent or solution to be filtered, the compliance and tolerance of the pH value, the rationality of the temperature, etc. It is necessary to consult the manufacturer's guidelines or technical specifications to verify compatibility.
6. After analyzing the cause of dissolution, you can make improvements item by item to optimize the filtration conditions and ensure that the filtration conditions (such as pressure, flow rate and temperature) are suitable for the selected filter membrane and the solution to be filtered.
7. Implement preventive measures. If irritating chemicals or solvents are used, take necessary precautions to protect the filter membrane from damage, including using protective equipment, adjusting filtration parameters or choosing a more chemically resistant membrane.
8. Monitor the filtration process. Monitor the filtration process regularly to ensure that the new filter membrane is operating effectively and there is no sign of degradation or dissolution.

The cause of aqueous membrane dissolution is a relatively complex process. By following these simple steps above, it may not be possible to completely solve the problem, but if we take necessary precautions to ensure the compatibility of the filter membrane with the filtered solution while avoiding some abnormal factors, we can prevent the occurrence of membrane dissolution problems to a certain extent and maintain the integrity of the filtration process.