PAN/PDMS-GO混合基质膜用于大豆油生产中丙酮的回收OA

To recover acetone from soybean oil/acetone blend,PAN/PDMS-GO mixed-matrix membranes(MMMs)were prepared using polyacrylonitrile(PAN)membranes as the base membranes,polydimethylsiloxane(PDMS)as the separator layer and were doped with multilayer graphene oxide(GO).The effects of GO doping on the physic-ochemical properties and solvent recovery performance of the composite membranes were investigated experimen-tally.The results showed that GO doping not only reduced the water contact angle of the membranes and increased the solubility of acetone,but also increased the crosslink density of PDMS.This is due to the presence of a large number of hydroxyl and carboxyl groups on the surface of GO,which reacted with the silicon hydrogen bonding of the PDMS cross-linker in the presence of a platinum(Pt)catalyst.The mechanical properties and thermal stabil-ity of the PDMS layer were improved after GO doping,indicating that GO has excellent compatibility with PDMS.As the GO doping increased,the permeation flux of MMMs to acetone decreased while the oil retention increased.When the mass fraction of GO doped was 0.07%,the PAN/PDMS-GO MMMs exhibited the best separation per-formance at an operating pressure of 1.8 MPa,with a permeation flux of 3.87 kg/(m2·h)to acetone and an oil re-tention rate of 100%,demonstrating the potential for application in solvent recovery in industrial production of soybean oil.