THE SYNTHESIS OF 4-(4,5-DIPHENYL-1H-IMIDAZOLE-2-YL)-N,N- DIMETHYLBENZENAMINE USING MICROWAVE ASSISTED ORGANIC SYNTHESIS METHOD (MAOS) AS CORROSION INHIBITOR ON CARBON STEEL IN 1% NACL SOLUTION

• Main Author: Asatyas, Syifa
• Format: Final Project
• Language: Indonesia
• Subjects: Kimia
• Online Access: https://digilib.itb.ac.id/gdl/view/34849
• Institution: Institut Teknologi Bandung

Imidazole derivatives are currently being developed as a corrosion inhibitor in oil and natural gas pipeline. The synthesis method of imidazole derivative 4-(4,5-diphenyl-1H-imidazole-2- yl)-N,N-dimethylbenzenamine was optimized in this study using Microwave Assisted Organic Synthesis (MAOS) method, the resulting compound was then applied as a corrosion inhibitor on carbon steel in corrosive environment 1% NaCl. There was some steps of synthesis in this study, i.e. benzoine condensation, benzoine oxidation to bibenzoil, and formation of imidazole ring. The imidazole ring formation in synthesis of 4-(4,5-diphenyl- 1H-imidazole-2-yl)-N,N-dimethylbenzenamine was caused by reaction between bibenzoil, 4- dimethylamino benzaldehyde, and ammonium acetate in the presence of microwave iradiation for 10 minutes. The resulting compound is a white solid with 61.92% yield, then was characterized by melting point determination, Infrared Spectrofotometry (IR), 1HNMR 13CNMR, and Mass Spectroscopy TOF MS ES . The melting point is 266-267 oC. Mass Spectroscopy analysis showed peak at 340,18 m/z, fits molecular formula of C23H22N3. The analysis of 1HNMR, 13CNMR, and IR spectra confirmed that the resulting compound was 4- (4,5-diphenyl-1H-imidazole-2-yl)-N,N-dimethylbenzenamine. Corrosion inhibition test on the resulting compound using Electrochemical Impedance Spectroscopy (EIS) Method showed the optimum inhibition efficiency was 74.32%, obtained at 40 oC and in the presence of 70 ppm inhibitor. The presence of (4,5-diphenyl-1H-imidazole-2-yl)-N,N- dimethylbenzenamine increased the activation energy from 27.02 kJ/mol to 29.47 kJ/mol.