Author/Authors :
Afandiyev, Lala Institute of Petrochemical Processes - Azerbijan National Academy of Sciences (ANAS), AZERBIJAN , Abbasov, Vagif Institute of Petrochemical Processes - Azerbijan National Academy of Sciences (ANAS), AZERBIJAN , Aliyeva, Leylufer Institute of Petrochemical Processes - Azerbijan National Academy of Sciences (ANAS), AZERBIJAN , Ahmadbayo, Saida Institute of Petrochemical Processes - Azerbijan National Academy of Sciences (ANAS), AZERBIJAN , Azizbeyli, Emin Institute of Petrochemical Processes - Azerbijan National Academy of Sciences (ANAS), AZERBIJAN , Abd El-Lateef Department - College of Science - King Faisal University - Al Hufuf - 31982 Al Hassa, SAUDI ARABIA , Hany M. Department - College of Science - King Faisal University - Al Hufuf - 31982 Al Hassa, SAUDI ARABIA
Abstract :
The mixture of Synthetic Petroleum Acids (SPA) and oxyacids (OSPA) have been
synthesized on the basis of naphthenic-paraffinic hydrocarbons separated from 217-349°C fractions
of Azerbaijan oils in the presence of the salts of Natural Petroleum Acids (NPA). The acid number
of the obtained (SPA+OSPA) was 165 mgKOH/g, the yield was 40%. Imidazoline derivatives
have been synthesized based on the mixture of SPA+OSPA and polyethylene polyamine (PEPA) and
their complexes were prepared with CH3COOH and HCOOH. The inhibition action of these complexes
on steel corrosion in 1% NaCl solution saturated with CO2 has been studied at 50°C. The results
showed that all compounds are good inhibitors and the inhibition efficiencies in the presence of
imidazoline derivatives based on SPA+OSPA were 93% and 97% at 25 and 50 ppm, respectively.
The activation parameter study suggests the chemisorption for all inhibitors. The obtained values
for Gibbs free energy show that the compounds are spontaneously adsorbed on the metal surface
by chemisorptions. The image of the steel surface proved that the formed protective film
on the electrode surface was stable. The adsorption of the studied compounds on steel surface
follows the Langmuir adsorption isotherm.
Keywords :
Imidazoline derivatives , Inhibition , CO2 corrosion , oxy acids , Synthetic petroleum acids , Diesel fraction
