PROCESS FOR RECOVERING CARBON BLACK AND HYDROCARBONS FROM USED TIRES

摘要

The invention is a process for economically recovering carbon black, oil and duel gas from used tires. Used tires are physically sliced and fragmented. The fragments are pyrolized in an oxygenlimited, hydrocarbon vapor at subatmospheric pressure in a reactor while being refluxed with process char, preferably. An embodiment showing the reflux with process heavy oil is also shown, but this embodiment is not preferred and has deleterious effects on the process. Entrained char is separated from the vapor phase products of the pyrolysis, and the vapor phase products of the pyrolysis are then fractionated into oil and fuel gas. A preferred embodiment condenses reactor vapors in two stages at two temperature levels to produce a high temperature flash point heavy fuel oil and a light fuel oil essentially in the naptha boiling point range. The fuel gas can be compressed and burnt to provide process heat. The entrained char and some heavy oil is returned to the reactor. Solid phase pyrolysis products are stripped of trash and milled to carbon black in an air swept roller mill. Carbon black is mechanically separated from the effluent air stream of the roller mill and formed into pellets with added water and dried in a series multi-stage fluid bed dryer.