Formation of Graphite by Hydrothermal Decomposition of Chlorinated Hydrocarbons

Abstract

Effects of the conditions of hydrofnermal decomposition (temperature, time, alkaline concentration, degree of filling and addition of Na₂Si0₃) on the formation of carbon from chlorinated organic materials were studied by using a microautoclave.
The carbon formed by dechlorinating decomposi tions of 1, 1, 1 -trichloroethane had spherical particles with uniform diameters (3-5 νm). Silicate ion had a large effect on carbonation of 1, 1, 1-trichloroethane under the alkaline hydrothermal conditions of 300°C, 300 kg/cm², 24reaction time. It was easy to form graphite structures. However, polychlorinated adamantanes did not transform to graphite tructure but only to the amorphous one with addition of Na₂SiO₃.
It was suggested that the silicate acts as a catalyzer of graphitization from organic materials and the graphite among silicate rocks may be formed at relatively mild conditions around the critical point.