Genbrugsfremgangsmåde, apparat og produkt fremstillet ved denne fremgangsmåde, til fremstilling af e t extender/plastificeringsmiddel ud fra brugte automobilgummidæk

摘要

A preferred embodiment of the process and apparatus for recycling used automobile rubber tires is described in which small pieces of rubber tires are progressively fed into a vertical reactor of the counter-flow type in which the material progressively descends downward through the reactor with process gases passing upward through the downwardly decending material to decompose and volatilize the rubber material. At the lower portion of the vessel, oxygen-bearing gas is injected into the reactor to burn a portion of the rubber carbon to generate hot combustion gases that ascend upwardly to pyrolitically decompose the rubber pieces, and to volatilize such material. The amount of oxygen is controlled in an oxygen-deficient manner to maintain the temperature in the combustion zone at a temperature of less than 500 DEG F. The gases and volatilized rubber materials and oils are removed from the reactor at a temperature of approximately 350 DEG F. At an elevation below the top layer of the rubber pieces in a high velocity stream to maintain the oils entrained in the air stream. The air stream is directed into condensers for condensing the rubber process oils. The raw rubber process oils are subdivided to obtain a residue heavy fraction rubber oil material having a flash point of greater than 340 DEG F. and greater at one atmosphere and a boiling point of greater than 450 DEG F. at 20 mm Hg for use as an extender/plasticizing agent in rubber compounding in which such agent has shown to exhibit unusual and unexpected results. The oxygen-bearing gas is initially maintained at a temperature of between 40 DEG and 60 DEG F. and is then passed through the condenser as the cooling agent before it is passed into the reactor. Consequently, the air-bearing gas serves as the cooling agent in the condenser and also as the oxidizing agent for burning a portion of the carbon in the reactor to generate the desired temperatures.