Material Analysis
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PESU Membrane Material Solvent Selection
Problem Phenomenon
【Problem Phenomenon】In PESU ultrafiltration membrane preparation, traditional solvents face great environmental pressure, and the process needs upgrading
Cause Analysis
PESU/PSU are mainstream support materials for UF/MF membranes and NF/RO composite membranes, traditional solvents such as NMP have environmental toxicity problems; research has verified that water-soluble green solvents such as Rhodiasolv Polarclean can replace them
Solution
Evaluate green solvent substitution process routes; readjust the casting solution formulation according to the new solvent system; perform rejection rate and flux comparison verification for membrane performance; after adjustment, continuously sample to verify the effect, confirm stability before resuming mass production
Key Takeaway
Green solvent substitution for PESU membranes is now feasible, formulation readjustment plus performance verification; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar problems in the future
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