Obtaining a rubber-bitumen asphaltic concrete pavement binder by the thermocatalytic processing of petroleum residues in a mixture with rubber crumb in the presence of zeolites and organo-mineral activators

It has been ascertained that qualitative rubber-bitumen asphaltic concrete pavement binders can be obtained at one stage by the method of the catalytic thermolysis of residual oil in the mixture with rubber crumb of worn-out tires in the presence of synthetic or natural zeolites or pyroshale that adsorb coke besides catalyzing the process. The mineral part of pyroshale and zeolite powder with adsorbed coke and soot forming during the decomposition of rubber are a thin-disperse modifier of paving bitumens. The catalytic thermolysis of residual oil with adding 30–40% of rubber crumb proceeds under comparatively soft conditions (a temperature of 350–375° C, isothermal exposure with a duration of 10–30 min) in the presence of 1–3% of zeolite or pyroshale. The yield of a high-qualitative rubber-bitumen binder with the content of 18–20% of mineral and organic modifiers can reach 50–60 wt % of the used raw material. Rubber crumb is utilized completely. There are no foreign analogs of the suggested technology. An experimental-industrial installation with a capacity of 9000–10000 t of bitumen component/year was created in the city of Kudepsta in the Krasnodar Territory.