GB833562A - Process for preparation of carbon disulphide - Google Patents

Abstract

Carbon disulphide is prepared by passing a gas containing sulphur vapour through a bed of finely-divided electrically-conductive carbon particles to maintain the bed in a fluidized state, passing an electric current through the fluidized bed to maintain it at reaction temperature, e.g. 700-1500 DEG C., preferably 900-1200 DEG C., and recovering CS2 from the effluent gases. The contact time of S and C should be 0.5-10 secs. N2 entering at 21 carries S from heated reflux flask 15 through heated tube 17, superheater 18, and diffuzer 19 into fluidized bed 13 in glass or refractory tube 12. The bed 13 is petroleum coke produced in a fluidized bed-coking process and calcined, e.g. at 900 DEG C. for 2 hours to increase the conductivity. The bed 13 is heated by current supplied through <PICT:0833562/III/1> electrodes 1, 2 and a thermocouple well 20 is also provided, on all of which radiation shields are provided (Figs. 2, 3, not shown). Additional N2 is supplied through 5 and gas disperser 4 of graphite with a porous carbon top, the latter having thermal insulation, e.g. petroleum coke particles 7 below. The calcination of the petroleum coke may be in a separate fluidized bed reactor, or may be in situ by feeding small amounts of "green" coke to the bed 13 to replace that consumed. Effluent gases are withdrawn through trap 22 and filter 23, where sulphur is removed, to condenser 24, whence CS2 passes to receiver 25.