Effect of the solvent nature on the formation of intra- and intermolecularly hydrogen-bonded associates in crude oil solutions

The effect of the solvent chemical nature on the formation of hydrogen-bonded associates in solutions of crude oil from the Usa field has been studied by means of IR spectroscopy. An increase in proportion of a solvent with a high exchange interaction potential (chloroform, toluene) leads to the breaking of intra- and intermolecular hydrogen bonds between the oil components and to the formation of new associates with the solvent. As the proportion of a low-polarity solvent (hexane, carbon tetrachloride) increases, the dissociation of intermolecular hydrogen bonds between the oil components is observed, whereas the formation of associates with the solvent is spectrally undetectable.