GROUP-STRUCTURAL COMPOSITION OF THE ASPHALTENE-RESINOUS COMPONENTS OFRESIDUAL AND PRODUCED CRUDE OILS

Derivatographic analysis of specimens from a number of areas of Tatars tan oil fields has shown that in alcohol-benzene resins of residual an d produced oils there are no differences in the mass fraction of polyc yclic nuclei and peripheral substituents; asphaltenes of residual crud e oils differ from the asphaltenes of produced oils in a smaller size of the polyarene nucleus and its higher degree of substitution. On the basis of IR spectroscopy data it has been established that the total content of structural fragments characteristic of acids, ketones, amid es, phenols and sulphoxides in an average molecule decreases in the fo llowing order: alcohol-benzene resins of residual crude oils - alcohol -benzene resins of produced crude oils - asphaltenes of residual crude oils - asphaltenes of produced crude oils; the molecular weight incre ases mainly in the same order. Condensed structural blocks containing a small number of heterofunctional substituents are capable of forming three-dimensionally ordered pack macroparticles of asphaltenes throug h pi-pi interaction. This interaction is difficult in blocks containin g heterosubstituents in greater quantity, and they are therefore a com ponent part of alcohol-benzene resins, for which the formation of poly associates is characteristic.