Autocatalyzed and Ion-Exchange-Resin-Catalyzed Esterification Kinetics of Lactic Acid with Methanol

Abstract

The esterification kinetics of lactic acid with methanol without addition of catalyst and catalyzed by ion-exchange resins are presented in this work. The effect of catalyst type, stirrer speed, catalyst size, catalyst loading, initial reactant ratio, and temperature on reaction kinetics was evaluated. Experimental reaction rates were correlated by some models based on homogeneous and heterogeneous (dual- and single-site mechanisms) approaches. Nonideality of the liquid phase was taken into account by using activities instead of mole fractions. Prediction of the activity coefficients was made by UNIFAC. Parameters of the different models were obtained by the simplex search method.

Methyl lactate synthesis using batch reactive distillation: Operational challenges and strategy for enhanced performance

“…Several investigators have explored only the kinetics of LA esterification with methanol in the past (Choi et al, 1996;Seo and Hong, 2000;Sanz et al, 2002;Kumar et al, 2006b;andJiang et al, 2010. Sanz et al (2004) A quasi-homogeneous (QH) activity (a i = γ i x i ) based on kinetic model is used and can be written as:…”

Reactive distillation with side draw

“…Lactic acid is a relatively strong acid (pK a = 3.85) and selfcatalyses its esterification. Similarly, traces of lactic acid present in the lactate-water mixture are known to catalytically trigger the hydrolysis [12]. In a conventional reactive distillation configuration, methyl lactate is expected to leave the column from the bottom.…”

Kinetics of Free Fatty Acid Esterification in Used Cooking Oil Using Hypercrosslinked Exchange Resin as Catalyst

“…lactic acid, myristic acid and palmitic acid) with different kinds of ion exchange resins. Reference [4] studied the kinetics of lactic acid esterification reaction with methanol (MeOH), catalysed by different acidic resins, such as Dowex 50W8x, Dowex 50W2x, Amberlyst 36 and Amberlyst 15 dry. They used three types of kinetic models, QH, ER and LHHW, to correlate the experimental data.…”