http://www.inchem.org...ts/hsg/hsg/hsg108.htm
Quote...
4.7 Disposal
Small quantities of carbon tetrachloride may be disposed of by
evaporation in a fume cupboard or in a safe, open area. Incineration
is not recommended due to the non-flammability of carbon tetrachloride
and to the formation of phosgene, hydrogen chloride and other toxic
gases on heating.
Keep others away. Pour it out on a non-absorbent dry surface. Stay upwind. It will evaporate quickly.