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)	Name	Chemical group	Kind of hydrogen
9.0–12.0	H1		Aldehydic and carboxylic hydrogens.
7.2–9.0	H2		Aromatic hydrogens joined to di or polyromantic compounds.
6.0–7.2	H3		Aromatic hydrogens joined to monoaromatic compounds.
4.5–6.0	H4		Olephinic hydrogens.
2.0–4.5	H5		CH, CH2, and CH3, paraphinic and naphthenic hydrogens, joined to aromatics system in α position. Other groups in this region could be -OH and -SH.
1.5–2.0	H6		CH2 naphthenic hydrogens, β to aromatic systems.
1.0–1.5	H7		CH3 paraphinic hydrogens β to aromatic systems and alky termination.
0.1–1.0	H8		CH3 paraphinic hydrogens γ to aromatic systems.