Structural changes in resins and asphaltenes in the course of their separate and combined cracking were studied. Cracking was carried out in a batch reactor at 450 degrees C for 2 h. Data on the mass balance of the cracking process and the composition of liquid products were obtained, and the structural-group analysis of resins and asphaltenes was carried out. It was found that condensation reactions dominated on the cracking of both resins and asphaltenes and their mixture; this was reflected in a high yield of solid condensation products. It was established that the direction of thermal transformations changed in the combined cracking of resins and asphaltenes, as evidenced by a lower yield of solid products and structural changes in the molecules of newly formed resins and asphaltenes.
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