Membrane separation of unconverted carbon fiber precursors...

Details Membrane separation of unconverted carbon fiber precursors... Membrane separation of unconverted carbon fiber precursors...

C - Chemistry, Metallurgy

10

C

196/39, 182/15.4

C10C 3/08 (2006.01) C10C 3/00 (2006.01) D01F 9/145 (2006.01) D01F 9/32 (2006.01)

Patent

CA 1240944

ABSTRACT OF THE DISCLOSURE Flux solvents and/or pitch neomesophase anti-solvents used in the generation of carbon fiber precursors from pitch are separated from mixtures of such solvent and unconverted carbon fiber precursors by contacting said mixtures with asymmetric hydrophobic membranes under conditions of reverse osmosis. The membranes used in this separation are asymmetric polyi- mide membranes and asymmetric polyvinylidene fluoride membranes. Separation conditions include a contacting pressure sufficient to overcome the osmotic pressure of the solvent. The pressure is typically about 300 to 1000 psi. Contacting temperature is about 0 to 100°C, preferably about 20 to 80°C. The membrane of choice is an asymmetric polyimide membrane.

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