International Journal of Chemical Engineering / 2019 / Article / Tab 4

Research Article

Chemical-Enhanced Oil Recovery Using N,N-Dimethylcyclohexylamine on a Colombian Crude Oil

Table 4

Kind of hydrogen and NMR intervals for crude oil characterization.

δ (ppm)NameChemical groupKind of hydrogen

9.0–12.0H1Aldehydic and carboxylic hydrogens.
7.2–9.0H2Aromatic hydrogens joined to di or polyromantic compounds.
6.0–7.2H3Aromatic hydrogens joined to monoaromatic compounds.
4.5–6.0H4Olephinic hydrogens.
2.0–4.5H5CH, CH2, and CH3, paraphinic and naphthenic hydrogens, joined to aromatics system in α position. Other groups in this region could be -OH and -SH.
1.5–2.0H6CH2 naphthenic hydrogens, β to aromatic systems.
1.0–1.5H7CH3 paraphinic hydrogens β to aromatic systems and alky termination.
0.1–1.0H8CH3 paraphinic hydrogens γ to aromatic systems.

Article of the Year Award: Outstanding research contributions of 2020, as selected by our Chief Editors. Read the winning articles.