The existence of imidazoline corrosion inhibitors
Spectroscopic methods, i.e., Fourier transform infrared (FT-IR), carbon-13 nuclear magnetic reasonance (/sup 13/C NMR), and ultraviolet (UV) spectroscopy, were used to investigate the actual chemical composition of oilfield corrosion inhibitors. Inhibitor formulations consisting of an amide or imidazoline reacted with a dimer-trimer acid, along with an ethoxylated surfactant and an aromatic solvent, were used for these studies. /sup 13/C NMR and FT-IR spectra of these inhibitors, as well as spectra of pure imidazolines, showed that the imidazoline functional group was fairly rapidly hydrolyzed to the amide form. For instance, in FT-IR studies, the imine functional group decreased in intensity as a function of time. Coincident with this was an increase in the intensities of the vibrational resonances attributed to the amide functionality. The relative molar ratio of imidazoline to amide in a corrosion inhibitor could be calculated via UV spectroscopy. Within a 20 day interval after inhibitor synthesis, this ratio decreased by a factor greater than 20. These results, as well as a discussion of their economic impact on oilfield corrosion inhibitor formulation, are presented in this paper.
- Research Organization:
- Texaco, Inc., Bellaire, TX
- OSTI ID:
- 5357222
- Journal Information:
- Corrosion (Houston); (United States), Vol. 41:5
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CORROSION INHIBITORS
CHEMICAL ANALYSIS
CHEMICAL COMPOSITION
AMIDES
CARBON 13
FIELD PRODUCTION EQUIPMENT
FOURIER TRANSFORMATION
IMIDAZOLES
INFRARED SPECTRA
NMR SPECTRA
OIL FIELDS
ULTRAVIOLET SPECTRA
AZOLES
CARBON ISOTOPES
EQUIPMENT
EVEN-ODD NUCLEI
GEOLOGIC DEPOSITS
HETEROCYCLIC COMPOUNDS
INTEGRAL TRANSFORMATIONS
ISOTOPES
LIGHT NUCLEI
MINERAL RESOURCES
NUCLEI
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PETROLEUM DEPOSITS
RESOURCES
SPECTRA
STABLE ISOTOPES
TRANSFORMATIONS
020300* - Petroleum- Drilling & Production