Composition of Petroleum Resins Inhibiting the Precipitate Formation in an Ultrasonically Treated Solution of Petroleum Wax in Decane

• Published in: Petroleum chemistry Vol. 62; no. 2; pp. 161 - 168
• Main Authors: Morozova, A. V., Volkova, G. I., Krivtsov, E. B.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01.02.2022; Springer; Springer Nature B.V
• Subjects: Alcohol; Alkanes; Aromatic compounds; Benzene; Carbon; Chemistry; Chemistry and Materials Science; Composition; Hydrocarbons; Industrial Chemistry/Chemical Engineering; Paraffins; Resins; Ultrasonic imaging; Waxes; (alcohol + benzene)-soluble resins; benzene-soluble resins; ultrasonic treatment; solution of petroleum wax in decane; structural-group analysis
• ISSN: 0965-5441; 1555-6239
• DOI: 10.1134/S0965544122060044

The effect of ultrasound and kind of petroleum resins on the composition of the dispersion medium (raffinates) recovered from a 6 wt % solution of petroleum wax in decane as a result of precipitate formation was studied. Irrespective of the kind of petroleum resins (benzene-soluble or (alcohol + benzene)-soluble) or of their combined action with ultrasound, the content of n -alkanes in the paraffin fraction of the raffinates decreases and that of isoalkanes increases relative to the initial sample; the major components of the paraffin fraction are n -alkanes up to С 29 Н 60 . Benzene-soluble and (alcohol + benzene)-soluble resins of lower molecular mass remain in the raffinate obtained after the precipitate separation from a solution of the petroleum wax in decane. The content of naphthene and aromatic rings in the benzene-soluble and (alcohol + benzene)-soluble resins isolated from the raffinates considerably decreases. The benzene-soluble resins isolated from the raffinates are characterized by higher content of paraffinic carbon and higher total content of heteroatoms compared to the initial resins. The (alcohol + benzene)-soluble resins remaining in the raffinate, on the contrary, have considerably lower content of paraffinic carbon atoms, and the total content of the heteroatoms does not noticeably change relative to the initial resins. The combined treatment does not noticeably affect the structural-group parameters of the resins remaining in the raffinate. Hypothetical structural formulas of benzene-soluble and (benzene + alcohol)-soluble resins were suggested on the basis of the structural-group analysis data.