Optimization of Reaction Time on The Conversion of Palm Oil Derivative Methyl Ester Into A Nitrogen Compound using Zeolite-A Catalyst and Its Activity Test As A Corrosion Inhibitor for Mild Steel In A Corrosive Medium Saturated With CO2
Ilim (a*), Laila Hidayah (b), Rifdah Kamilah (c), Kamisah Delilawati Pandiangan (a), and Wasinton Simanjuntak (a)

a) Department of Chemistry
*ilim[at]fmipa.unila.ac.id
b) Graduate Student of Department of Chemistry
c) Student of Department of Chemistry
Faculty of Mathematics and Natural Sciences, the University of Lampung, Jl. S. Brojonegoro No 1 Bandarlampung, 35145 Indonesia

Abstract

In this research, optimization of the conversion of palm oil derivative methyl esters into nitrogen compounds was carried out using a zeolite-A catalyst. The amidation reaction was carried out in an autoclave reactor at a constant temperature of 100 C with a reaction time of (24, 48, 72, 96) hours with a stirring time of 30 minutes. The use of zeolite-A and autoclave for the amidation reaction is a novelty in this study. The amidation product was characterized by FTIR and GCMS, then used as a corrosion inhibitor for mild steel in a corrosive medium saturated with CO2 using the wheel test method and the surface morphology of the steel samples was characterized by SEM. The FTIR spectra results show that the amidation products are different from methyl ester, the wave number 1744 cm-1 is the stretching of the C=O ester which has been converted into an amide group in the amidation product which is indicated by the presence of C=O amide vibrations at the wave number 1617 cm-1 and the presence of C-N vibrations at wave numbers 1118 cm-1 and 1051 cm-1. The resulting amidation product still contains diethanolamine compounds which have not finished reacting, as indicated by the presence of O-H vibrations at a wave number of 3298 cm-1. The results of GC-MS analysis show that the amidation product contains nitrogen compounds at time variations of 24, 48, 72, and 96 hours, namely 30.35%, 13.70%, 35.41%, and 47.03%, respectively. Testing the inhibitory activity of nitrogen compounds using a wheel test with 4 variations in reaction time obtained percentage protection of 89.34%, 90.44%, 92.77% and 95.17% respectively. This is also supported by the results of surface morphology analysis using SEM, the amidation product which was synthesized with a reaction time of 96 hours and a stirring time of 30 minutes and produced 47.03% nitrogen compounds with 95.17% protection had the smoothest surface. Based on the results obtained, it shows that nitrogen compounds derived from palm oil hav

Keywords: Palm oil methyl ester- zeolite-A- amidation- nitrogen compounds- corrosion inhibitors

Topic: Chemistry and Applied Chemistry