The influence of the internal structure and dispersity to structural-mechanical properties of oil systems

Some oils and oil products are dispersed systems with composite internal or ganization. The dynamical model of dispersed particle, named complex struct ural unit (CSU), with complicated internal structure is suggested. A nucleu s surrounded by solvate shell contains high-molecular mass components of di fferent natures. Sizes of nuclei and solvate shells change in accordance wi th the magnitude of external influence. An optimal correlation between para meters of CSU and the value of external factor can be fixed for every techn ological process. The results of determination of the dispersity degree in oil systems are presented. Connection of nonmonotonous extremal dependence macroscopic parameters (viscosity, stability, etc.) and microscopic ones (p article sizes) with external influence value changing is shown. These regul arities are basic for the intensification of technological processes. Techn ology is tested in practice with good results. For managing structural-mech anical properties, the addition of heavy residue, containing significant am ount of resin-asphaltene substances (RAS), has been chosen together with th ermal treatment and regulation of speed of cooling. Speed of cooling determ ines sizes and number of interacting particles. Connections between particl es could be realized through the solvate shells formed from RAS or directly with each other. Finally, the structure of coalescence or condensation typ e is formed. These kinds of structures differ in their structural-mechanica l properties. Such oil compositions are basis for specific products, which are used in mining industry for dust depressing and preventing adherence of granular materials to the walls of transportation equipment. The optimal c ombination of influencing of external factors gives an opportunity to inclu de bigger amount of heavy residues for decreasing the cost. (C) 2000 Elsevi er Science B.V. All rights reserved.