Ammonolysis of Fatty Acid Methyl Esters for Production of Fatty Acid Amides as Surfactant Precursors

Abstract

Fatty acid amides are important industrial compounds widely utilized as surfactant precursors, lubricants, corrosion inhibitors, and additives in cosmetic and polymer industries. This study investigates the ammonolysis of fatty acid methyl esters for the production of fatty acid amides under controlled reaction conditions with emphasis on conversion efficiency, product selectivity, and process optimization. Experimental analyses were conducted to evaluate the influence of reaction temperature, ammonia concentration, catalyst loading, reaction time, and molar ratio of reactants on amide yield and by-product formation. The ammonolysis reaction mechanism involves nucleophilic substitution of the methyl ester group by ammonia, leading to the formation of corresponding fatty acid amides and methanol as a secondary product. Results demonstrated that optimized operating conditions significantly improved ester conversion and enhanced selectivity toward desired amide products while minimizing side reactions such as hydrolysis and thermal degradation. Kinetic evaluation revealed that reaction temperature and ammonia availability strongly influence the reaction rate and equilibrium behavior. Catalyst-assisted ammonolysis further improved reaction efficiency by accelerating ester activation and facilitating amide bond formation. Product characterization confirmed the successful synthesis of high-purity fatty acid amides suitable for downstream surfactant and specialty chemical applications. Compared with conventional synthetic approaches, the proposed process offers advantages such as lower energy requirements, improved raw material utilization, and reduced environmental impact.