Kinetic Study for the Reactive System of Lactic Acid Esterification with Methanol:  Methyl Lactate Hydrolysis Reaction

Sanz, Marı́a Teresa; Murga, Ruth; Beltrán, Sagrario; Cabezas, José Luis; Coca, José

doi:10.1021/ie034031p

Cited by 91 publications

(67 citation statements)

References 19 publications

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“…The equilibrium constants based on activities 27 as shown in eq 1 were calculated for different temperatures (in the range of 293.15-323.15 K), at 6 atm, at a stoichiometric initial molar ratio of reactants butanol/acetaldehyde (r A/B ) 2.2); the total volume of the reactants was 530 mL and the mass of the catalyst 1.8 g. It was ensured that, for these conditions, the amounts of adsorbed species are negligible, and there was only one liquid phase in spite of the fact that water and n-butanol are only partially miscible; therefore, the equilibrium composition is only related to the thermodynamic reaction equilibrium. Moreover, it was not detected any byproduct.…”

Section: Thermodynamic Equilibrium Constantmentioning

confidence: 99%

Oxygenated Biofuels from Butanol for Diesel Blends: Synthesis of the Acetal 1,1-Dibutoxyethane Catalyzed by Amberlyst-15 Ion-Exchange Resin

Graça

Pais

Silva

et al. 2010

Ind. Eng. Chem. Res.

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The synthesis of 1,1-dibutoxyethane or acetaldehyde dibutylacetal was studied in a batch reactor by reacting butanol and acetaldehyde in a liquid phase, using Amberlyst-15 as the catalyst. The reaction equilibrium constant was experimentally determined in the temperature range 20-40°C at 6 atm, where K a ) 0.00959 exp[1755.3/T (K)]. The standard properties of the reaction at 298.15 K were estimated: ∆H°) -14.59 kJ mol -1 , ∆G°) -3.07 kJ mol -1 , and ∆S°) -38.64 J mol -1 K -1 . Kinetic experiments were performed in the temperature range 10-50°C at 6 atm. A two-parameter kinetic law based on a Langmuir-Hinshelwood rate expression, using activity coefficients from the UNIFAC method, was used. The kinetic parameters are k c ) 2.39 × 10 9 exp[-6200.9/T (K)] (mol g cat -1 min -1 ) and k s,D ) 2.25 × 10 -4 exp[3303.1/T (K)]. The activation energy of the reaction is 51.55 kJ mol -1 . This work is an important step for further implementation of an integrated reaction-separation process, such as a simulated moving-bed reactor.

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Section: Thermodynamic Equilibrium Constantmentioning

confidence: 99%

Oxygenated Biofuels from Butanol for Diesel Blends: Synthesis of the Acetal 1,1-Dibutoxyethane Catalyzed by Amberlyst-15 Ion-Exchange Resin

Graça

Pais

Silva

et al. 2010

Ind. Eng. Chem. Res.

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“…The use of solid-acid catalysts, such as sulfatated zirconia, clays, ion-exchange resins, zeolites, and zeotypes appears as a good alternative to the homogenous catalysis (10). Previous works report the use of ion-exchange resins for acetalization (11,12) and esterification reactions (13,14).…”

Section: Introductionmentioning

confidence: 99%

Dynamic Study of the Synthesis of 1,1-Dibutoxyethane in a Fixed-Bed Adsorptive Reactor

Graça

Pais

Silva

et al. 2011

Separation Science and Technology

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“…Reaction Scheme Reference LA + MEOH  ML+ H 2 O (Sanz et al, 2004) EL + MEOH  ML+ ETOH (Özen, 2004) AmL+ MEOH => ML+ AM (Filachione et al, 1945) AgL + CH 3 CL => ML + AgCL (Özen, 2004) GLA or DHA => HC => ML (West et al, 2010) The esterification process of LA (impure) with many alcohols to yield lactate ester is not new.…”

Section: Introductionmentioning

confidence: 99%

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

Aqar

Rahmanian

Mujtaba

2016

Separation and Purification Technology

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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.

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Kinetic Study for the Reactive System of Lactic Acid Esterification with Methanol: Methyl Lactate Hydrolysis Reaction

Cited by 91 publications

References 19 publications

Oxygenated Biofuels from Butanol for Diesel Blends: Synthesis of the Acetal 1,1-Dibutoxyethane Catalyzed by Amberlyst-15 Ion-Exchange Resin

Oxygenated Biofuels from Butanol for Diesel Blends: Synthesis of the Acetal 1,1-Dibutoxyethane Catalyzed by Amberlyst-15 Ion-Exchange Resin

Dynamic Study of the Synthesis of 1,1-Dibutoxyethane in a Fixed-Bed Adsorptive Reactor

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

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