Synthesis of New Heterocyclic Compound Used as Corrosion Inhibitor for Crude Oil Pipelines

Abstract

This study comprises synthesis of new heterocyclic compound  through  one of the most powerful  methods in organic synthesis  and which comprises formation of several bonds in a single transformation and all interaction materials have been combined in one pot since beginning of interaction. This compound contains  on nitrogen, oxygen and sulfur atoms and is 3,5,12-trithia-1,7,14-triaza-tricycle [5.3.3.27,10] tetradeca-6(14),9-dien-8-one, and its structure has been  determined  by using several techniques such as, Nuclear magnetic resonance spectrophotometer for proton 1H-NMR and carbon13C- NMR, Infra-red spectroscopy FT-IR, and Mass spectroscopy MS. The last part  is the study and application of  compound as a inhibitor for  corrosion crude oil pipelines (N-80 type)  in saline water  as a corrosive medium and has been evaluated by using weight loss method, as well as has been evaluated through electrochemical techniques such as potentiodynamic polarization, electrochemical impedance spectroscopy EIS, and scanning electron microscopy- energy dispersive X-ray spectroscopy SEM/EDX. The effect of time and concentration on the corrosion rate  have been  studied and was observed that efficiency of inhibition  increased with increase  inhibitor concentration to attain a maximum values of 90.12%, 90.62%, 79.70%,  90.05%  to weight loss method, polarization technique, impedance technique and  energy dispersive X-ray technique respectively. Finally the prepared inhibitor was compared with some of disincentives commercial used in the south oil company such as, AS-101, WFT-9368, COIL GARD, HQI-85M and AL-600