Here is a more rationale temperature route extracted from the literature and presented at Atomistry.com. To quote:
"When calcium carbide and sulphur are heated together at 270° C. carbon disulphide in about 20 per cent, yield and considerable quantities of carbon
are produced. At higher temperatures the amount of carbon disulphide diminishes, only traces being detected at 500° C."
Link: http://sulphur.atomistry.com/carbon_disulphide.html
Accept the low yield, and just work with larger quantities! |