GB642557A - Improved manufacture of carbon bisulphide - Google Patents

Abstract

Carbon bisulphide is made by passing sulphur vapours, superheated to 600-800 DEG C. by passage in countercurrent to and in direct contact with a moving bed of hot small particles of a refractory material, into contact with reactive carbon, e.g. charcoal, in an insulated <PICT:0642557/III/1> reaction zone maintained at a temperature not materially exceeding 850 DEG C. solely by the heat of reaction. As shown, molten sulphur from kettle 1 is vaporized at 4 and the vapours passed to a superheater 6 consisting of three refractory lined chambers 8, 9, 10. Mullite pebbles, heated in chamber 8 by the combustion products of gas or oil burner 13, pass through chamber 9 wherein they heat the sulphur vapour and thence to chamber 10 from which they are returned to chamber 8 by an air lift, the air separated at 23 returning to a blower 25 via a dust separator 27. The heated vapours pass into an insulated reactor 28 to react with charcoal from a hopper 33. Ash is removed periodically through outlet 30 while exit gases are passed to condenser 40, liquid carbon bisulphide passing to receiver 42. Non-condensed gases pass to oil scrubber 44, hydrogen sulphide escaping through line 45. The wash oil passes to reboiler 47 and stripper 48 whence the separated vaporized carbon bisulphide is returned to the condenser 40. To start the reaction, the charcoal in chamber 29 is burned by air admitted through inlet 7 until a glowing zone is established, when the air is shut off and a flow of sulphur vapour started. To prevent gas leakage from chamber 8 to chamber 9 or vice versa, the static pressure in the two chambers is equalized by adjustment of valve 15 in vent stack 14 and valve 38 in exit pipe 37 of the reactor.