A method of regenerating vulcanized crumb rubber which comprises the steps of: a) introducing vulcanized crumb rubber and a lubricant into a first mixer, said lubricant being at room temperature; b) mixing said crumb rubber and lubricant at room temperature during an adequate period of time to form a mixture; c) transferring said mixture into a thermokinetic mixer (7, 20), said thermokinetic mixer comprising: an air tight stationary chamber for receiving the mixture, said chamber having an inner non-uniform surface and comprising: a cooling jacket outwardly surrounding the inner non-uniform surface, for cooling down a temperature of said inner non-uniform surface when the shaft and blades are rotating; and at least one cooling injection device adapted to inject water as a cooling agent into the chamber; and a rotor shaft co-axially extending into the chamber, said rotor shaft having blades extending from the shaft into the chamber and a controlled speed of the rotor shaft varying between 400 rpm and 1400 to 2000 rpm; d) raising the speed of the rotor shaft in order to increase a temperature of the mixture during a first period of time until a devulcanizing temperature is reached; e) reducing the temperature of the mixture reached in step d) to a lower temperature during a second period of time by lowering the rotational speed of the rotor shaft, said step e) comprising: injecting water as a cooling agent into the stationary chamber, the water vaporizing at the contact of the mixture, the vapour carrying out impurities and sulfur derivatives resulting from partial devulcanization occurring in step d); and f) recovering regenerated crumb rubber from the chamber. a) introducing vulcanized crumb rubber and a lubricant into a first mixer, said lubricant being at room temperature; b) mixing said crumb rubber and lubricant at room temperature during an adequate period of time to form a mixture; c) transferring said mixture into a thermokinetic mixer (7, 20), said thermokinetic mixer comprising: an air tight stationary chamber for receiving the mixture, said chamber having an inner non-uniform surface and comprising: a cooling jacket outwardly surrounding the inner non-uniform surface, for cooling down a temperature of said inner non-uniform surface when the shaft and blades are rotating; and at least one cooling injection device adapted to inject water as a cooling agent into the chamber; and a rotor shaft co-axially extending into the chamber, said rotor shaft having blades extending from the shaft into the chamber and a controlled speed of the rotor shaft varying between 400 rpm and 1400 to 2000 rpm; an air tight stationary chamber for receiving the mixture, said chamber having an inner non-uniform surface and comprising: a cooling jacket outwardly surrounding the inner non-uniform surface, for cooling down a temperature of said inner non-uniform surface when the shaft and blades are rotating; and at least one cooling injection device adapted to inject water as a cooling agent into the chamber; and a rotor shaft co-axially extending into the chamber, said rotor shaft having blades extending from the shaft into the chamber and a controlled speed of the rotor shaft varying between 400 rpm and 1400 to 2000 rpm; d) raising the speed of the rotor shaft in order to increase a temperature of the mixture during a first period of time until a devulcanizing temperature is reached; e) reducing the temperature of the mixture reached in step d) to a lower temperature during a second period of time by lowering the rotational speed of the rotor shaft, said step e) comprising: injecting water as a cooling agent into the stationary chamber, the water vaporizing at the contact of the mixture, the vapour carrying out impurities and sulfur derivatives resulting from partial devulcanization occurring in step d); and f) recovering regenerated crumb rubber from the chamber.