In the paper, structural changing of resin-asphaltene molecules in cracking process of oil sand bitumen are investigated. Cracking process to natural bitumen carried out in an open-to-air reactor, which extracted from oil sand by organic solvent. Reaction temperature was 450 °С and process duration was 60 min. The reactor was heated at a rate of 10 °C/min up to the desired temperature. Di-tert-butyl peroxide was used as radical formation additive. When limiting oxygen, it can be used catalyst molecule supplies as the oxidizer. The thermal destruction processes of heavy hydrocarbons with the catalyst make it possible to increase the yield of low boiling liquid products with the formation of coke and gas as by-products. High temperature leads to increase the oil content, and decrease the total resinasphaltene components in bitumen. Monte Carlo method used for construction the molecular structure of resin-asphaltene components. The calculations data determined the most stable conformation of resins and asphaltenes molecules, that the stability of the molecules affect structural characteristics such as the number of structural blocks, their size and spatial arrangement of atoms with respect to each other. Microscopic images showed that the asphaltenes have around 40‒50 nm of particle size, which large monolithic switching, weakly focused on a major surface, provided with amorphous carbon.

A literature review on the topic of the study has shown that there is not much work with the use of oily waste in the modification of bitumen. Many methods of bitumen modification include the oxidation of a heavy oil residue to obtain the target product and its further compounding with the finished bitumen. Old oil sludge from oil sludge storage tanks has been used as the oil residue. Oil sludge is prepared by dehydration, the water content should not exceed no more than 5 wt. % and separation of mechanical impurities up to a content of not more than 16.4 wt. %. Purpose of the work. The main objective of the study is to develop a technology for modifying oil bitumen with industrial waste for the disposal of oil sludge, and to show the possibility of improving the physical-chemical, rheological characteristics of modified bitumen. Results. In the process of bitumen modification, the physical-chemical characteristics of the modified bitumen have been studied. It has been established that the composition of oil sludge from the Uzen and Zhetybai oilfield of the Mangistau region contains a significant amount of heavy oil residues and a small amount of mechanical impurities. From the conducted laboratory esearch, it has been found that oil sludge can be used as a filler in the modification of bitumen. Conclusion. Used oil sludge can be used as a bituminous base modifier without removing the mechanical impurities. Polymer-bitumen compositions have been prepared and the optimal parameters for the process of preparing polymer-bitumen binders have been determined.