Low volatile binder pitch

Details Low volatile binder pitch Low volatile binder pitch

C - Chemistry, Metallurgy

10

C

196/42, 307/6

C10C 3/06 (2006.01) C10C 1/04 (2006.01)

Patent

CA 1236789

ABSTRACT LOW VOLATILE BINDER PITCH A low volatile binder pitch for making Soderberg electrodes having a softening point of 130 to 140 C as defined according to ASTM D-3104. This pitch which has low carcinogenic fume emission, has preferably a quinoline insoluble content of 10-14%, and an ash content of less than 0.3%. A method of preparing the pitch consists in vacuum distilling a coal tar material having less than 5% Q.I. and not more than 0.1% ash, to collect at first a distillate and maintain said distillation until the vapour temperature of the distillate to be collected is at least over 350°C, stopping said distillation and then collecting the residue of said distillation to produce the binder pitch having a softening point of 130° to 140°C.

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