Potential and assessment of lactic acid production and isolation - a review

Jantasee, Sasiradee; Kienberger, Marlene; Mungma, Nuttakul; Siebenhofer, Matthäus

doi:10.1002/jctb.5237

Cited by 46 publications

(36 citation statements)

References 70 publications

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“…Poly lactic acid production requires lactic acid with a purity >95% [3], which can be obtained by fermentation. Lactic acid is produced either by chemical synthesis or by fermentation of carbon-based resources.…”

Section: Introductionmentioning

confidence: 99%

Reactive Extraction of Lactic Acid, Formic Acid and Acetic Acid from Aqueous Solutions with Tri-n-octylamine/1-Octanol/n-Undecane

2019

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The present work develops the basics for the isolation of lactic acid, acetic acid and formic acid from a single as well as a mixed feed stream, as is present, for example, in fermentation broth for lactic acid production. Modelling of the phase equilibria data is performed using the law of mass action and shows that the acids are extracted according to their pka value, where formic acid is preferably extracted in comparison to lactic and acetic acid. Back-extraction was performed by 1 M NaHCO3 solution and shows the same tendency regarding the pka value. Based on lactic acid, the solvent phase composition, consisting of tri-n-octylamine/1-octanol/n-undecane, was optimized in terms of the distribution coefficient. The data clearly indicate that, compared to physical extraction, mass transfer can be massively enhanced by reactive extraction. With increasing tri-n-octylamine and 1-octanol concentration, the equilibrium constant increases. However, even when mass transfer increases, tri-n-octylamine concentrations above 40 wt%, lead to third phase formation, which needs to be prevented for technical application. The presented data are the basis for the transfer to liquid membrane permeation, which enables the handling of emulsion tending systems.

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Section: Introductionmentioning

confidence: 99%

Reactive Extraction of Lactic Acid, Formic Acid and Acetic Acid from Aqueous Solutions with Tri-n-octylamine/1-Octanol/n-Undecane

2019

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“…Moreover, preparation methods of LA include chemical synthesis and microbial fermentation. The sustainable production of LA makes it potential to replace some petrochemicals . Inspired by above researches, we expect that the esterification of SA with LA will also be a promising idea to regulate phase transition temperature so that the novel PCMs could be used in wide low‐temperature heat transfer systems.…”

Section: Introductionmentioning

confidence: 99%

Facile Preparation of Calcium Stearoyl Lactylate as Solid–Liquid Phase Change Materials with Improved Form Stability and Adjustable Phase Transition Temperature for Thermal Comfort

Jiang

Zhou

Liu

et al. 2019

Env Prog and Sustain Energy

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In this study, a homologous series of calcium stearoyl lactylates (CSLs) with adjustable phase transition temperature were synthesized as solid–liquid phase change materials (PCMs) by esterification between stearic acid (SA) and lactic acid (LA), combining with the self‐esterification of LA, and neutralization with calcium hydroxide (Ca(OH)2). The chemical structures of CSLs were confirmed by Fourier transform infrared spectroscopy (FT‐IR) and 1H nuclear magnetic resonance spectrum (1H NMR). X‐ray diffraction (XRD) was applied to study the crystalline structure of solid–liquid PCMs. Differential scanning calorimetry (DSC) and thermogravimetry analysis (TGA) were carried out to determine the phase change properties and thermal stability of prepared CSLs. Research results show that calcium ions (Ca2+) have positive effects on improving form stability of synthesized PCMs. The melting temperatures in the range of 40.45°C–25.47°C could be tailored by varying the molar ratio of SA to LA from 1:1 to 1:4. The thermal storage capabilities reach about 53% with the latent heat of fusion in the range of 84.5–55.50 J/g. The PCMs show acceptable thermal reliability and reusability after thermal cycles for 100 times. Suitable phase transition temperatures make CSLs potential for thermal comfort, and the mechanism of temperature regulation would provide reference for design of more PCMs used in different situations. © 2019 American Institute of Chemical Engineers Environ Prog, 38:e13136, 2019

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“…This continuous fermentation bioprocess is used for lactic acid production. The lactic acid has a variety of applications in the food industry, in the biochemical industry for cosmetic and textile production, and also in the production of new biodegradable and biocompatible polylactic products …”

Section: Introductionmentioning

confidence: 99%

“…The lactic acid has a variety of applications in the food industry, in the biochemical industry for cosmetic and textile production, and also in the production of new biodegradable and biocompatible polylactic products. [16][17][18][19][20][21][22] The control objective for the two-stage CSTRs structure is to adjust the plant's load to convert the glucose into lactic acid via fermentation. More precisely, the control goal is to maintain the process at certain operating points corresponding to maximum lactic production rate and minimum residual glucose concentration.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear robust adaptive control strategies for a lactic fermentation process

Petre

Selişteanu

Roman

2017

J of Chemical Tech & Biotech

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BACKGROUND This work addresses the design of robust adaptive control strategies for a lactic fermentation process carried out inside a continuous stirred tank reactor (CSTR). This bioprocess is widely used in bioindustry for lactic acid production, and it is characterized by strong nonlinearities and uncertainties. Under the realistic assumption that the reaction kinetics and the influent flow rates are unknown and time‐varying, but lower and upper bounds of the uncertainties are known, two innovative robust adaptive control structures are proposed. RESULTS The control strategies are designed by combining a linearizing control law with two novel parameter estimators able to estimate the unknown reaction rates. The first strategy uses a modified observer based estimator and the second one utilizes an interval parameter estimator. The control objective is to adjust the plant load so as to convert the glucose into lactic acid via fermentation, which is directly correlated with the economic aspects of lactic acid production. Numerical simulations are performed in order to validate the proposed solution. CONCLUSION By using the proposed control strategies the process is maintained at certain operating points that correspond to a maximum lactic production rate and a minimal residual glucose concentration. The simulations performed by considering various uncertainties and noisy measurement data show that the proposed novel robust adaptive controllers are suitable to control this kind of fermentation processes. © 2017 Society of Chemical Industry

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Potential and assessment of lactic acid production and isolation - a review

Cited by 46 publications

References 70 publications

Reactive Extraction of Lactic Acid, Formic Acid and Acetic Acid from Aqueous Solutions with Tri-n-octylamine/1-Octanol/n-Undecane

Reactive Extraction of Lactic Acid, Formic Acid and Acetic Acid from Aqueous Solutions with Tri-n-octylamine/1-Octanol/n-Undecane

Facile Preparation of Calcium Stearoyl Lactylate as Solid–Liquid Phase Change Materials with Improved Form Stability and Adjustable Phase Transition Temperature for Thermal Comfort

Nonlinear robust adaptive control strategies for a lactic fermentation process

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