Theoretical elucidation of acetylating glycerol with acetic acid and acetic anhydride

“…Several heterogeneous solid catalysts for synthesis of triacetin from glycerol and acetic acid has been explored, such as aminosulphonate (Liu et al, 2007), phosphotungstic, mesoporous silica with sulfonic acid groups (Melero et al, 2007), SO 4 2-/ZrO 2-TiO 2 (Wu et al, 2007), Amberlist-15 15 (Zhou et al, 2013), K-10, Niobic acid, HZMS-5 and HUSY (Goncalves et al, 2008), Amberlyst-35 (Liao et al, 2010), ZrO 2 , TiO 2 -ZrO 2 , WOx/TiO 2 -ZrO 2 and MoOx/TiO 2 -ZrO 2 (Reddy et al, 2010). However, heterogeneous catalyst has complicated catalytically sites, i.e., chemically and geometrically for improving selectivity to a certain product.…”

Section: Catalyst For Reactionmentioning

confidence: 99%

Continuous Process of Reactive Distillation to Produce Bio-additive Triacetin From Glycerol

Mufrodi¹,

Rochmadi

Sutijan³

et al. 2013

MAS

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Glycerol as byproduct of biodiesel production is a very promising low-cost feedstock for producing a wide variety of special and fine chemicals. This great amount of glycerol needs to be converted into higher valuable products. One of glycerol's derivatives potential is triacetin, a good bio-additive as anti-knocking agent. In previous work triacetin synthesis from glycerol and acetic acid using sulfuric acid catalyst has been conducted in batch and continuous process. In this work, triacetin was synthesized using reactive distillation. The continuous process has 98.50% of glycerol conversion with 8.98% of triacetin selectivity.

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“…Thus, the parameters for the equilibrium correlations were estimated by the simulator from the molecular structures of these two species, which were fed to the software. Due to their molecular structures, the most favorable isomers to form during the reactions are 1-monoacetin and 1,3-diacetin [9], and thus these isomers were adopted to represent the monoacetin and diacetin in the simulations; 4) the NRTL-HOC thermodynamic model was adopted, because it can well represent aqueous electrolyte systems, and in addition, the Hayden-O'Connell model provides an adequate representation of the vapor phase behavior, since during the reaction gaseous species are generated, mainly due to acetic acid evaporation; the binary interaction parameters were the same ones adopted by Hung et al [3]; 5) The reaction rates were modeled according to the previously described kinetic model, with the kinetic parameters shown in Table II. As in the study by Galan et al [2], four times molar excess of acetic acid was adopted, so that 1 mol of glycerol to 12 mol of acetic acid was fed to the reactive distillation column.…”

Section: A Methodsmentioning

confidence: 99%

Glycerol Esterification with Acetic Acid by Reactive Distillation Using Hexane as an Entrainer

Souza¹,

Ferreira²,

Marin³

et al. 2017

IJCEA

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Abstract-A process design study was carried out, aimed at the design of a triacetin production process from glycerol, as a way to increase the feasibility of biodiesel production. Glycerol esterification with acetic acid involves three consecutive reversible acetylation reactions and in each step, water is produced, resulting in limited conversion and low selectivity [1]. One way to increase the triacetin selectivity is to continuously remove water from the reaction medium, in order to shift the equilibrium. The proposed process is based on the reaction system described by Galan et al.[2], consisting of the esterification of glycerol using excess acetic acid as catalyst. In the first step of the present study an evaluation of the kinetic parameters was carried out, based on published experimental data [2]. The reaction conditions were then evaluated in terms of glycerol conversion and selectivity for different reaction times and temperatures. Based on the results, the process was simulated in a reactive distillation column, and different configurations were studied by using the Aspen Plus® simulator. In the separation units the NRTL-HOC equilibrium model with binary interaction parameters proposed by Hung et al.[3] was adopted. Water removal from the top stream of the column was increased by feeding hexane as an entrainer in the reactive distillation column. Hexane is recovered in a separate unit and recycled to the process. The conceptual process specifications of an optimized industrial plant configuration were estimated for minimum specific energy consumption for production of 99.9 % molar purity triacetin with complete glycerol conversion.

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Theoretical elucidation of acetylating glycerol with acetic acid and acetic anhydride

Cited by 100 publications

References 28 publications

Esterification of High Free Fatty Acid Rice Bran Oil: Parametric and Kinetic Study

Esterification of High Free Fatty Acid Rice Bran Oil: Parametric and Kinetic Study

Continuous Process of Reactive Distillation to Produce Bio-additive Triacetin From Glycerol

Glycerol Esterification with Acetic Acid by Reactive Distillation Using Hexane as an Entrainer

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