Method of making either a softener for rubber mixtures or a furnace fuel oil

Claim 1

A method of making either a softener for rubber mixtures or a furnace fuel oil, comprising the steps of: a. heating to a temperature of from 150° to 600° C. a hydrocarbonaceous solvent selected from the group consisting of oil fractions having boiling temperatures of 40° to 120° C., 50° to 250° C., 250° to 400° C. and 200° to 500° C., coke-chemical fractions having boiling temperatures of 320° to 535° C., and furnace fuel oils produced according to the presently claimed method; b. adding vulcanized or, olefinically unsaturated nonvulcanized waste rubber to said heated hydrocarbonaceous solvent under intensive stirring, wherein said waste rubber is added to said hydrocarbonaceous solvent in a ratio of 1:1 to 1:100 parts by mass; c. thermally decomposing said waste rubber at a pressure of 5·10 2 to 25·10 5 n/m 2 and at a temperature of 150° to 485° C. for 1 to 300 seconds, said hydrocarbonaceous solvent continuously circulating through the reaction mixture at a rate of 1 to 30 l/hr per 1 kg of the waste rubber; and d. separating the end product from the formed suspension by distillation at a temperature of 200° to 560° C. and at a pressure of 10 to 2·10 5 n/m 2 in the presence of an inert gaseous agent.