Dibutyl maleate is a perfumery ester used as an intermediate in the production of paints, adhesives, and copolymers. Esterification of maleic acid and butanol was studied in presence of acidic cation exchange resin as a catalyst. The objective of this work was to test the suitability and efficacy of heterogeneous catalystssuch as Indion 225H and Amberlyst-15 in the synthesis of dibutyl maleate. Various parameters deciding the conversion of reaction such as mole ratio, catalyst loading, molecular sieves, speed of agitation and effect of temperature were optimized for the maximum rate and conversion. The activation energy was calculated as 71.5 kcal/mol. Diffusivity value DAB (maleic acid in n-butanol) at 80◦C was calculated as 5.08 × 10 ⁻¹⁰ m ²/s and effective diffusivity (De-A) was calculated as 5.08 × 10 ⁻¹¹ m ²/s. Solid–liquid mass transfer coefficient(ksl-A) was calculated as 6.77 × 10 ⁻⁶ m/s for the particle size of Amberlyst-15 as 0.5 mm.
Volume 134, 2022
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