Preparation and properties of composite nanofiltration membrane for fine separation of aromatic components from tobacco
PA/PMIA composite nanofiltration membranes were prepared for fine separation of aromatic components in tobacco extract,in which the polyamide(PA)layer was composited on the surface of poly(m-phenylene isophthalamide)(PMIA)ultrafiltration membranes through interfacial polymerization reaction.When the concentration of piperazine(PIP)in aqueous phase was 0.5％,the concentration of trimesoyl chloride(TMC)in oil phase was 0.15％,and the interfacial reaction time was controlled at 30s,the performance of PA/PMIA composite nanofiltration membrane prepared was optimal.It exhibited a pure water flux of up to 63.8 L/(m2·h),a glucose rejection rate of 91.52％,and a cutoff molecular weight of 180.The PA/PMIA composite nanofiltration membranes were used to filter and separate tobacco extract,and the concentration of nicotine and alkaloid in the filtrate was greatly reduced,achieving the separation and concentration of aroma components in tobacco.Additionally,the application of a two-stage filtration process combining ultrafiltration and nanofiltration allowed for a more precise separation of tobacco extracts,resulting in a greater variety of aroma components and higher concentrations of alkaloids and nicotine.
poly(m-phenylene isophthalamide)nanofiltration membraneinterfacial polymerizationmembrane based separation technologyseparation and concentration of aroma components from tobacco extracts
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