Kinetics of the liquid phase synthesis and hydrolysis of butyl lactate catalysed by cation exchange resin

Uyar

Chemical Engineering Communications

2008

In the present study, the kinetics of esterification of acetic acid with isobutanol was studied by using Amberlite IR-122 as an acid catalyst. Experiments were carried out in a stirred batch reactor in dioxane at different temperatures (323 to 348 K) under atmospheric pressure. The equilibrium constant was found to be constant as 4 in the temperatures ranging from 323 to 367 K. The possible mechanism of reaction was mathematically treated using the theories of the Eley-Rideal model based on inhibition by water and isobutanol on the resins. The reaction rate constants and the adsorption coefficients for isobutanol and water were determined from the experimental data at the same temperature intervals. Furthermore, the activation energy of the esterification reaction was found to be 50.5 kJ=mol. The heat of adsorption for isobutanol and water was also calculated as À50.9 kJ=mol and À18.9 kJ=mol, respectively.

Section: Kinetic Modelmentioning

confidence: 88%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Determination of Adsorption and Kinetic Parameters for Synthesis of Isobutyl Acetate Catalyzed by Amberlite Ir-122

Uyar

Chemical Engineering Communications

2008

Separation and Purification Technology

“…Yadav et al (2000) and Toor et al (2011) studied the esterification of LA with isopropanol to synthesize isopropyl lactate. A number of researchers also discussed the reaction of LA with n-butanol to produce n-butyl lactate (Charles and Gabriel, 1928;Dassy et al, 1994;Kumar and Mahajani, 2007).…”

Section: Introductionmentioning

confidence: 99%

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

Aqar

Rahmanian

Mujtaba

2016

Link to original published version: http: //dx.doi.org/10.1016/j.seppur.2015.12.023 Citation: Aqar DY, Rahmanian N and Mujtaba IM (2016) Methyl lactate synthesis using batch reactive distillation: Operational challenges and strategy for enhanced performance. Separation and Purification . AbstractBatch reactive distillation is well known for improved conversion and separation of desired reaction products. However, for a number of reactions, the distillation can separate the reactants depending on their boiling points of them and thus not only reduces the benefit of the reactive distillation but also offers operational challenges for keeping the reactants together. Methyl lactate (ML) synthesis via the esterification of lactic acid (LA) with methanol in a reactive distillation falls into this category and perhaps that is why this process has not been explored in the past. The boiling points of the reactants (LA, methanol) are about 490 K and 337 K while those of the products (ML, water) are 417 K and 373 K respectively. Clearly in a conventional reactive distillation (batch or continuous) methanol will be separated from the LA and will reduce the conversion of LA to ML significantly.Here, first the limitations of the use of conventional batch distillation column (CBD) for the synthesis of ML is investigated in detail and a semi-batch reactive distillation (SBD) configuration is studied in detail where LA is the limiting reactant and methanol is continuously fed in excess in the reboiler allowing the reactants to be together for a longer period. However, this poses an operational challenge that the column has to be carefully controlled to avoid overflow of the reboiler at any time of the operation. In this work, the performance of SBD for the synthesis of ML is evaluated using model based optimization in which operational constraints are embedded. The results clearly demonstrate the viability of the system for the synthesis of ML.

“…Moreover, it is possible to obtain important enhancement over the equilibrium conversion of the reactor feed stream by selectively separating one or more reaction products across the membrane wall [7]. The function of the porous membrane during esterification reaction is to selectively remove water from the reaction mixture which will result in an equilibrium shift thus, driving the reaction towards completion [8,9]. Membranes different geometry and characteristics are generally made from a wide variety of chemically and thermally stable polymers.…”

Section: Introductionmentioning

confidence: 99%

Evaluation and Characterisation of Composite Mesoporous Membrane for Lactic Acid and Ethanol Esterification

Okon¹,

Shehu²

2016

J Adv Chem Eng