Poly Ether Imide Ultrafiltration Membranes Research Articles

Application of integrated membrane technology in purification of chlorogenic acid

Integrated membrane technology is a membrane separation system, which can overcome the disadvantage of single membrane, save the cost, and improve the product quality. Chlorogenic acid, which is an effective component of Chinese medicine and a heat-sensitive substance, is not stable at high operation temperature. Chlorogenic acid with molecular weight of 354 Da and good solubility in water can be treated by nanofiltration (NF) membrane. In this work, polyetherimide (PEI) ultrafiltration (UF) membrane with good chemical and thermal stability is used in the purification of chlorogenic acid solution. Positively charged HACC/PEI NF membrane with good antibacterial performance and hydrophilicity is used to concentrate chlorogenic acid solution. It is found that, the PEI UF membrane can separate chlorogenic acid with other components and improve the purity of chlorogenic acid. At the same time, the rejection to chlorogenic acid of the positively charged NF membrane is about 92% which is suitable for the concentration of chlorogenic acid solution. The integrated membrane technology is very useful in the production of chlorogenic acid.

Preparation of PEI Ultrafiltration Membrane with Excellent Thermal Resistance

Polyetherimide (PEI) with excellent solvent resistance and thermal resistance is a good membrane material which is studied in detail. PEI ultrafiltration membrane with low molecular weight cut-off is prepared by phase inversion method in this work. The membrane showed high resistance to PEG1000 which can be used in wastewater treatment with organic solvent.