Recovering liq. rubber during recycling - by thermally decomposing used rubber with crude oil distillate and converting into new prod. during thermal stabilisation

摘要

Recovery of liquid rubber during recycling comprises thermally decomposing uncomminuted used rubber prods. in a hermetic reaction vessel at 350-500 deg.C using a high-boiling crude oil distillate, mazut, as the decomposition liquid. After decomposition of the rubber and fracturing of the sulphur bonds, a mixt. of dissolved rubber components and synthetic cord is present which is converted into a new prod. by adding of an octaphosphorous or a chlorine-sulphonated polyethylene during thermal stabilisation at 120-180 deg.C. Also claimed is the appts. for the process comprising a preresolver connected to an oven via a vessel (5). Heating to the reaction temp. is carried out in the oven. The decomposition liquid is fed via a pumping system into a reaction tank connected to a container for rinsing liq. and to heat exchanger for condensing the exhaust gases. The condensate obtained is collected in a vessel via a separator and recycled. ADVANTAGE - This process requires min. energy expenditure. The prod. formed has better bonding properties that those of bitumecom