The present invention relates to a method of filtering an oil, the method including the following steps (A) and (B): (A) allowing a hydrophobic gas to permeate through a porous membrane including a hydrophobic polymer as a main component; and (B) allowing an oil to permeate through the porous membrane, in which the step (B) is performed after the hydrophobic gas that has permeated through the porous membrane is confirmed to have a relative humidity of 0 to 60% in the step (A).

The present invention relates to a method of filtering an oil, the method including the following steps (A) and (B): (A) allowing a hydrophobic gas to permeate through a porous membrane including a hydrophobic polymer as a main component; and (B) allowing an oil to permeate through the porous membrane, in which the step (B) is performed after the hydrophobic gas that has permeated through the porous membrane is confirmed to have a relative humidity of 0 to 60% in the step (A).

Organic solvent nanofiltration membranes that include at least one polymer coated expanded polyparaxylylene (eP-PX) membrane are provided. A substrate/support layer may be positioned on one side of the ePPX membrane. In some embodiments, the substrate/support layer is sandwiched between ePPX membranes. Processes for manufacturing and using such organic solvent nanofiltration membranes are also provided. The organic solvent nanofiltration membranes are capable of separating and/or concentrating solutes from a solution comprising a lower molecular weight organic solvent with high permeability. The polymer coated ePPX membranes may also be resistant to chemical attack, resistant to gamma radiation, thermally stable, biocompatible, and strong.

Organic solvent nanofiltration membranes that include at least one polymer coated expanded polyparaxylylene (eP-PX) membrane are provided. A substrate/support layer may be positioned on one side of the ePPX membrane. In some embodiments, the substrate/support layer is sandwiched between ePPX membranes. Processes for manufacturing and using such organic solvent nanofiltration membranes are also provided. The organic solvent nanofiltration membranes are capable of separating and/or concentrating solutes from a solution comprising a lower molecular weight organic solvent with high permeability. The polymer coated ePPX membranes may also be resistant to chemical attack, resistant to gamma radiation, thermally stable, biocompatible, and strong.

The invention relates to the use of an uncoated cross-linked non-pyrolysed selective vinyl based halopolymer-membrane with a mwco of between 100 and 1000 Da, in the filtration of compounds from liquids comprising organic solvents and/or from liquids with a pH below 2 or above 12.

The invention relates to the use of an uncoated cross-linked non-pyrolysed selective vinyl based halopolymer-membrane with a mwco of between 100 and 1000 Da, in the filtration of compounds from liquids comprising organic solvents and/or from liquids with a pH below 2 or above 12.

A nanofiber membrane includes a polymer nanofiber; and an amphiphilic triblock copolymer bonded to the surface of the polymer nanofiber, the amphiphilic triblock copolymer includes a hydrophobic portion; hydrophilic portions positioned at both ends of the hydrophobic portion; and a low surface energy portion positioned at one end of each of the hydrophilic portions positioned at both ends of the hydrophobic portion, and the hydrophobic portion of the amphiphilic triblock copolymer is bonded to the surface of the polymer nanofiber and the hydrophilic portion and the low surface energy portion are exposed to the outside of the surface of the polymer nanofiber. The membrane simultaneously exhibits hydrophilicity, underwater oleophobicity, and low oil adhesion force, thus has surface segregation properties, and as a result, has an excellent oil permeate flux, exhibits antifouling properties, and can excellently separate oil in water.

A graft copolymer including zwitterionic repeat units and hydrophobic repeat units, in which the zwitterionic repeat units constitute 2-60 wt % of the graft copolymer and each of the hydrophobic repeat units is characterized in that a homopolymer formed thereof is miscible with polyvinylidene fluoride, polysulfone, poly ether sulfone, polyvinyl chloride, or polyacrylonitrile, each of the hydrophobic repeat units not being a repeat unit of polyvinylidene fluoride. Also disclosed is a filtration membrane containing such a graft copolymer or a statistical copolymer that includes the same composition of repeat units as the graft copolymer. Further disclosed are methods of preparing the graft copolymer and the filtration membrane.

The present invention relates to a comprehensive evaluation method for the performance of contaminated flat membranes, which relates to the field of sewage and waste resource technology. The present invention firstly analyzed the composition of the surface elements of the contaminated membrane by EDX to determine the type of membrane contamination, and then designed different cleaning schemes for organic or inorganic pollution to obtain a sample membrane. When the tensile strength of the contaminated membrane decreased more than 50% than that of the control membrane, it is a waste membrane; when the tensile strength decreased less than 50% and the membrane flux reduced more than 30%, it is a waste membrane; when tensile strength decreased less than 50%, membrane flux reduced less than 30% and the carbon footprint was more than 188 g, it is a waste membrane; otherwise was a old membrane. The comprehensive evaluation method of the present invention can quantitatively, quickly and comprehensively define the difference between the old membrane and the waste membrane, and provides the basis for the selection of the contaminated membrane and the process of the regeneration and reuse.

The present invention relates to a comprehensive evaluation method for the performance of contaminated flat membranes, which relates to the field of sewage and waste resource technology. The present invention firstly analyzed the composition of the surface elements of the contaminated membrane by EDX to determine the type of membrane contamination, and then designed different cleaning schemes for organic or inorganic pollution to obtain a sample membrane. When the tensile strength of the contaminated membrane decreased more than 50% than that of the control membrane, it is a waste membrane; when the tensile strength decreased less than 50% and the membrane flux reduced more than 30%, it is a waste membrane; when tensile strength decreased less than 50%, membrane flux reduced less than 30% and the carbon footprint was more than 188 g, it is a waste membrane; otherwise was a old membrane. The comprehensive evaluation method of the present invention can quantitatively, quickly and comprehensively define the difference between the old membrane and the waste membrane, and provides the basis for the selection of the contaminated membrane and the process of the regeneration and reuse.