Method of purifying partially carbonized pan material prior to c

Details Method of purifying partially carbonized pan material prior to c Method of purifying partially carbonized pan material prior to c

1983-05-09

1985-03-26

Meros, Edward J.

Chemistry of inorganic compounds

Carbon or compound thereof

Elemental carbon

264 292, 4234472, 4234476, 423449, D01F 922

Patent

active

045072728

ABSTRACT:
In a method of producing purified carbonized material from polyacrylonitrile precursor material, the precursor material is initially oxidized and partially carbonized prior to purification treatment to remove alkali and alkaline earth metal impurities. Following purification, the material is substantially completely carbonized. Purification is accomplished by weaving oxidized and partially carbonized tows of the polyacrylonitrile precursor material into a fabric and thereafter contacting the fabric with an aqueous acid solution at an elevated temperature followed by rinsing with a solvent which is substantially free of alkali and alkaline earth metal ions and which is at an elevated temperature. Purification of the tows after partial carbonization thereof limits the amount of tow weight loss and shrinkage occurring after the fabric is formed.

REFERENCES:
patent: 3413094 (1968-11-01), Gibson
patent: 4073869 (1978-02-01), Kalnin
patent: 4388289 (1983-06-01), Shepherd et al.

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