Significant thermal energy reduction in lactic acid production process

Mujtaba, Iqbal M.; Edreder, E.A.; Emtir, M.

doi:10.1016/j.apenergy.2010.11.031

Cited by 33 publications

(17 citation statements)

References 10 publications

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“…although fungi and bacteria are the most widely employed microorganisms for lactic acid production, bacteria have been frequently selected for industrial lactic acid production [9,16]. lactic acid bacteria have the ability Abstract The by-products of bioethanol production such as thin stillage (Ts) and condensed distillers solubles (cDs) were used as a potential nitrogen source for economical production of lactic acid.…”

Section: Introductionmentioning

confidence: 99%

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Utilization of by-products derived from bioethanol production process for cost-effective production of lactic acid

Moon¹,

Wee

Choi³

2014

Journal of Industrial Microbiology and Biotechnology

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The by-products of bioethanol production such as thin stillage (TS) and condensed distillers solubles (CDS) were used as a potential nitrogen source for economical production of lactic acid. The effect of those by-products and their concentrations on lactic acid fermentation were investigated using Lactobacillus paracasei CHB2121. Approximately, 6.7 g/L of yeast extract at a carbon source to nitrogen source ratio of 15 was required to produce 90 g/L of lactic acid in the medium containing 100 g/L of glucose. Batch fermentation of TS medium resulted in 90 g/L of lactic acid after 48 h, and the medium containing 10 % CDS resulted in 95 g/L of lactic acid after 44 h. Therefore, TS and CDS could be considered as potential alternative fermentation medium for the economical production of lactic acid. Furthermore, lactic acid fermentation was performed using only cassava and CDS for commercial production of lactic acid. The volumetric productivity of lactic acid [2.94 g/(L·h)] was 37 % higher than the productivity obtained from the medium with glucose and CDS.

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Section: Introductionmentioning

confidence: 99%

“…annual world production of lactic acid is estimated to reach 259,000 metric tons by the year 2012 [12,16]. There are two optical isomers of lactic acid, l and d; however, industrial application of lactic acid usually requires the l isomer.…”

Section: Introductionmentioning

confidence: 99%

Utilization of by-products derived from bioethanol production process for cost-effective production of lactic acid

Moon¹,

Wee

Choi³

2014

Journal of Industrial Microbiology and Biotechnology

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“…With the above backdrop, it is attempted to focus again at the esterification step in detail with the objective of enhanced production and recovery of ML rather than focusing on the purification of LA which has already received quite a bit of attention in recent years (Edreder et al, 2011;Mujtaba et al, 2012). Here, first, the limitations of CBD column are explored for the synthesis of ML.…”

Section: Introductionmentioning

confidence: 99%

“…Mujtaba (2004) reported different modes to operate batch distillation column: (A) Constant vapor boil-up rate mode, (B) Constant reboiler duty mode and (c) Constant condenser vapor load rate mode. For each mode, Mujtaba et al (2012) suggested the following equations to calculate the total energy consumption in the column:…”

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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“…According to forecasts, its production should increase significantly over the coming years mainly to provide the polylactic acid manufacturing sites, and is expected to reach 259,000 metric tons in 2012 (Mujtaba, Iqbal, Edreder, & Emtir, 2012). The Global Industry Analyst Inc. announced in January 2011 that the global market for lactic acid is forecast to reach approximately 329,000 metric tons by the year 2015.…”

Section: Production Technologies and Purificationmentioning

confidence: 99%

Produção de bacteriocina por Bifidobacterium lactis a partir de soro de leite

Balciunas¹

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Significant thermal energy reduction in lactic acid production process

Cited by 33 publications

References 10 publications

Utilization of by-products derived from bioethanol production process for cost-effective production of lactic acid

Utilization of by-products derived from bioethanol production process for cost-effective production of lactic acid

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

Produção de bacteriocina por Bifidobacterium lactis a partir de soro de leite

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