Kinetic study for esterification of lactic acid with ethanol and hydrolysis of ethyl lactate using an ion-exchange resin catalyst

Delgado, Patricia; Sanz, Marı́a Teresa; Beltrán, Sagrario

doi:10.1016/j.cej.2006.09.004

Cited by 140 publications

(112 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The results of the studies of Delgado et al [9] and Altiokka et al [12] indicate that there is no significant error in using concentrations in model equations instead of activities. Therefore modeling was done in terms of measured concentration values directly instead of using activity coefficients which give mathematical complexity.…”

Section: 32mentioning

confidence: 53%

Section: 31mentioning

confidence: 99%

“…Therefore two species are accounted for sorption effects in ER models' kinetic expression. Literature shows that water and ethanol are more likely to be involved in sorption effects in this mechanism [9].Third kinetic model in the interest is the pseudo homogeneous model. This mechanism treats the catalyst particles holding positive charged sites, as large cations dissolved in the reaction mixture [10].…”

mentioning

confidence: 99%

See 2 more Smart Citations

Heterogeneous Kinetic Study for Esterification of Acetic Acid with Ethanol

2014

View full text Add to dashboard Cite

Abstract:The esterification of acetic acid with ethanol has been investigated in the presence of a low cost ion exchange resin mainly used in the water treatment industry namely Trilite SCR-B as a heterogeneous catalyst. Internal mass transfer limitations have proven to be negligible using analysis based on Thieles modulus. The results of the experimental runs done by varying stirrer speeds of the reactor showed the absence of external mass transfer limitations. The kinetic experimental results were correlated with the heterogeneous kinetic models Langmuir-Hinshelwood (LH), Eley-Rideal (ER) and pseudo homogeneous kinetic model. The LH model was found to be correlating the experimental results better than the other two models. Reaction and adsorption constants were further evaluated within the temperature range between 335K and 355K, with 1:1 ethanol to acetic moles ratio under a catalyst loading of 50g/L. The study results of adsorption of both water and ethanol on to the cation exchange resin surface were found to be exothermic under the tested conditions. Furthermore, effect of concentration of each reactant on the reaction rate was examined using initial reaction rate measurements. Keywords:Heterogeneous catalysis, esterification kinetics, cation exchange resin, IntroductionEthyl Acetate is a valuable organic ester which is highly applied in perfumery, paint and coating industry, pharmaceutical industry and flavours in food industry [1], [2]. The commercial process of manufacturing ethyl acetate is based on the reaction of esterification between ethanol and acetic acid under an acid catalyst.However, several drawbacks are met in using homogeneous acid catalysts for the above reaction. Corrosion problems driven by liquid catalyst, huge energy consumption for separation of product from catalyst, waste of catalyst and lack of purity in the product represent these drawbacks [3]. [5]. Their work has generated experimental results that obey the LH mechanism. Further, they have proven that the activation energies for the catalysts D002 and NKC under the tested conditions lie between 51kJ/mol and 53kJ/mol. The resins used in above studies are costly making it a significant issue in scaling up the findings of those studies. Further they are not available in the local market. However ion exchange resins used in the industrial water treatment are available at low costs. Performance data on the use of low cost ion exchange resins used in the water treatment industry as a catalyst in the esterification of acetic acid with ethanol are not available in literature. Therefore evaluation of the performance and kinetic data for low cost cation exchange resins has been a requirement. No. 01,, 2014 © The Institution of Engineers, Sri Lanka ENGINEER 9In the present study, esterification reaction between acetic acid and ethanol, under the locally available low cost cation exchange resin Trilite SCR-B which is commonly used in water purification is investigated. This resin which is commercially available in Na + form is treated t...

show abstract

Section: 32mentioning

confidence: 53%

Section: 31mentioning

confidence: 99%

mentioning

confidence: 99%

See 1 more Smart Citation

Heterogeneous Kinetic Study for Esterification of Acetic Acid with Ethanol

2014

View full text Add to dashboard Cite

show abstract

“…The studies done by Alqahtani et al (2005), and Delgado et al (2007), have also reported that when the agitation speed is changed from a speed above a certain level to higher speeds, the rate of reaction doesn't change significantly for a similar kind of reaction setup as used in this study with ion exchange resin catalyst. Based on these observations, the agitation in this research was maintained at a constant level in each run assuming that the external mass transfer resistance under this condition was negligible.…”

Section: Mass Transfer Resistancementioning

confidence: 77%

Performance of ion exchange resin as solid catalyst for the esterification of acetic acid with ethanol

Bamunusingha

Silva²,

Gunasekera

2016

J. Natn. Sci. Foundation Sri Lanka

View full text Add to dashboard Cite

Esterification of acetic acid with ethyl alcohol was carried out in the presence of a cation exchange resin. The resin used was Lewatit S1467, which is commercially available at a low cost and used commonly in the water treatment industry. The catalyst pretreated with HCl showed higher acetic acid conversions. The acidic cation exchange resin treated with HCl was examined for catalyst loading, reaction temperature and reusability. The highest acetic acid conversion of 58 % was observed for acetic acid to ethanol mole ratio of 1:1 at 335 K with a 5.4 % (w/w) catalyst loading. The experimental data were fitted with the pseudo homogeneous model, and the heterogeneous models Langmuir-Hinshelwood (LH) and EleyRideal (ER). LH model provided a better agreement with the experimental kinetic data, and the activation energy was found to be about 58 kJmol -1 .

show abstract

“…For example, studies on esterification reaction of LA with ethanol to form ethyl lactate (EL) were investigated by Zhang et al (2004) and Delgado et al (2007). Adams and Seider (2008) proposed a semi-batch reactive distillation (SBD) process for the production of EL from ethanol and LA.…”

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

View full text Add to dashboard Cite

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.

show abstract

Kinetic study for esterification of lactic acid with ethanol and hydrolysis of ethyl lactate using an ion-exchange resin catalyst

Cited by 140 publications

References 21 publications

Heterogeneous Kinetic Study for Esterification of Acetic Acid with Ethanol

Heterogeneous Kinetic Study for Esterification of Acetic Acid with Ethanol

Performance of ion exchange resin as solid catalyst for the esterification of acetic acid with ethanol

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

Contact Info

Product

Resources

About