Composite body and use thereof in organophilic nanofiltration

A method comprising:

• separating organic compounds from organic solvent-containing streams of matter in an organophilic nanofiltration process,
• wherein said organophilic nanofiltration process comprises a composite body or a separation unit containing the composite body wherein said composite body comprises:
• a porous substrate,
• a first porous layer comprising oxide particles bonded to one another and also partly bonded to the porous substrate, wherein the oxide particles of the first porous layer comprises at least one of Al2O3, ZrO2 and SiO2, wherein the first porous layer is positioned on the porous substrate and in interstices of the porous substrate which include fibers of an electrically nonconductive material;
• a second porous layer positioned on at least on one side of the porous substrate, said second porous layer comprising oxide particles bonded to one another and partly bonded to the first porous layer, wherein the oxide particles of said second porous layer include at least one of Al2O3, ZrO2 and SiO2,
• wherein the oxide particles present in the first porous layer have a greater median particle size than the oxide particles present in the second porous layer, and
• wherein the median particle size (d50) of the oxide particles in the first porous layer, is from 0.5 to 4 μm and the median particle size (d50) of the oxide particles in the second porous layer is from 0.015 to 0.15 um,
• wherein a polymer coating (PB) comprising one or more polysiloxanes is provide atop or above the second porous layer;
• wherein the porous substrate is a nonwoven fabric, knit or laid scrim,
• wherein said composite body can be wound around a cylinder having a diameter of 15 mm without being damaged, and
• wherein a flexible composite body is suitable as an organophile nanofiltration membrane.