Oxygen distribution and hydrogen bonding in Athabasca asphaltene

✍ Scribed by Teresa Ignasiak; Otto P. Strausz; Douglas S. Montgomery

• Publisher: Elsevier Science
• Year: 1977
• Tongue: English
• Weight: 803 KB
• Volume: 56
• Category: Article
• ISSN: 0016-2361
• DOI: 10.1016/0016-2361(77)90059-x

✦ Synopsis

The oxygen distribution in the Athabasca asphaltene has been investigated. On the average, 75% of the oxygen is present in the form of hydroxyl groups. 1.r. studies indicate that these hydroxyl groups exist almost entirely as hydrogen-bonded complexes which do not dissociate in carbon tetrachloride. The decrease in the molecular weight of the acetylated, methylated and silylated asphaltene suggests that the hydrogen bonding is intermolecular in character. The i.r. spectra of the asphaltene fractions extracted with polar solvents showed the presence of free OH, NH and carbonyl groups. The strong hydrogen-bonding properties of the Athabasca asphaltene were confirmed in i.r. measurements of the interaction with phenol, and molecular weight determinations of asphaltene 2,7naphthalenediol and 4,4'-dihydroxy-3,3'-dimethyldiphenyl mixtures.