THE SYNTHESIS OF BENZAMIDE THROUGH THE REARRANGEMENT OF AMINO(HYDROXY)(PHENYL)METHYL BENZIMIDATE AS CORROSION INHIBITOR TOWARDS CARBON STEEL IN ACETATE BUFFER ENVIRONMENT

• Main Author: Primabrian, Frizda
• Format: Final Project
• Language: Indonesia
• Subjects: Kimia
• Online Access: https://digilib.itb.ac.id/gdl/view/35143
• Institution: Institut Teknologi Bandung

Corrosion is the successive degradation of metal quality that happens in a corrosive environment. Corrosion cannot be prevented but can only be controlled. One of the most effective ways to protect the inner surface of steel pipes used to transfer crude oil and gas, is to inject the environmentally friendly inhibitor of organic compounds containing N, O, or S atoms. In this research benzamide has been successfully synthesized from the reaction between benzonitrile with propanaloxime by using Microwave Assisted Organic Synthesis (MAOS) method. The purity of the synthesized product was tested by TLC using ethylacetate and n-hexane with a ratio of 3:7 as eluents. The product is more polar than its precursors and has melting point range within 122-123oC. The FTIR spectrum shows the vibration peak of primary -NH2 group at 3172.90 cm-1 and 3367.71 cm-1. Mass spectra of the product, recorded using HRMS TOF ES+ [M+H+], revealed that the product has molecular mass of 121.0595 m/z. This result is in accordance with the molecular formula of C7H7NO and 1H-NMR and 13C-NMR spectrums, which confirm that the product is benzamide. Corrosion inhibition test of benzamide is analyzed electrochemically by using EIS and Tafel methods in acetate buffer solution at various suhue, concentration, and pH level conditions. The optimum corrosion inhibition efficiency of benzamide is 87.74% in the condition of 30oC, concentration of 40 ppm, and in pH 4 acetate buffer solution. The presence of benzamide in the system increased the activation energy from 33.32 kJ/mol in the uninhibited system to 61.15 kJ/mol. The ?Gads value of benzamide on carbon steel is -39.68 kJ/mol, which shows the semi-physical or semi-chemical type of benzamide adsorption on the carbon steel surface.