Reactive extraction of citric acid using supercritical carbon dioxide

Djas, Małgorzata; Henczka, Marek

doi:10.1016/j.supflu.2016.05.005

Cited by 28 publications

(14 citation statements)

References 19 publications

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“…Dajs and Henczak investigated and reported on reactive extraction of citric acid from aqueous solutions using SC-CO 2 techniques involving tri- n -octylamine (TOA) as a reactant. The latter is utilized to form a complex with citric acid [170]. Citric acid as well as lactic acid can be determined spectrophotometrically via an acetic anhydride pyridine method, gas chromatography, HPLC and high-resolution NMR.…”

Section: Value-added Productsmentioning

confidence: 99%

Modern Extraction and Purification Techniques for Obtaining High Purity Food-Grade Bioactive Compounds and Value-Added Co-Products from Citrus Wastes

Mahato

Sinha

Sharma

et al. 2019

Foods

212

133

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Citrus contains a range of highly beneficial bioactive compounds, such as polyphenols, carotenoids, and vitamins that show antimicrobial and antioxidant properties and help in building the body’s immune system. On consumption or processing, approximately 50% of the fruit remains as inedible waste, which includes peels, seeds, pulp, and segment residues. This waste still consists of substantial quantities of bioactive compounds that cause environmental pollution and are harmful to the ecosystem because of their high biological oxygen demand. In recent years, citrus cultivation and the production of processed foods have become a major agricultural industry. In addition to being a substantial source of economy, it is an ideal and sustainable and renewable resource for obtaining bioactive compounds and co-products for food and pharmaceutical industries. In the present article, the various methods of extraction, conventional and modern, as well as separation and isolation of individual bioactive compounds from the extraction mixture and their determination have been reviewed. This article presents both aspects of extraction methods, i.e., on a small laboratory scale and on an industrial mass scale. These methods and techniques have been extensively and critically reviewed with anticipated future perspectives towards the maximum utilization of the citrus waste.

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Section: Value-added Productsmentioning

confidence: 99%

Modern Extraction and Purification Techniques for Obtaining High Purity Food-Grade Bioactive Compounds and Value-Added Co-Products from Citrus Wastes

Mahato

Sinha

Sharma

et al. 2019

Foods

212

133

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“…In the extraction of polar compounds using non-polar scCO 2 , the use of extractants forming complexes is required. The extractants additionally increase the solubility of the extracted compounds in supercritical fluid [65]. In many cases, the addition of diluents is necessary because of the extractant's high viscosity and caustic character.…”

Section: Supercritical Reactive Extractionmentioning

confidence: 99%

“…The comparison of semi-continuous and batch mode revealed that the first one leads to a higher efficiency of citric acid separation due to the avoidance of the effect of low trioctylamine solubility in scCO 2 . The factors such as pressure and temperature influenced the final reactive extraction efficiency, which was the best (96.9%) with high pressure (16 MPa) and low temperature (35 • C) using a flow of scCO 2 saturated with trioctylamine [65]. The supercritical extraction is a promising technique when reactive extraction is needed, with particular application to the extraction of carboxylic acids from fermentation broths [64,67].…”

Section: Supercritical Reactive Extractionmentioning

confidence: 99%

Innovative Approaches for Recovery of Phytoconstituents from Medicinal/Aromatic Plants and Biotechnological Production

Fierăscu

Orţan

et al. 2020

Molecules

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Continuously growing demand for plant derived therapeutic molecules obtained in a sustainable and eco-friendly manner favors biotechnological production and development of innovative extraction techniques to obtain phytoconstituents. What is more, improving and optimization of alternative techniques for the isolation of high value natural compounds are issues having both social and economic importance. In this critical review, the aspects regarding plant biotechnology and green downstream processing, leading to the production and extraction of increased levels of fine chemicals from both plant cell, tissue, and organ culture or fresh plant materials and the remaining by-products, are discussed.

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“…Thus, alternative processes for citric acid recovery and purification from fermented musts have been developed. In recent studies, involving the purification of citric acid, it is worth mentioning the use of a bipolar membrane electrodialysis [3] [4] and reactive extraction using a tertiary amine and supercritical carbon dioxide [5].…”

Section: Introductionmentioning

confidence: 99%

Solvent Extraction of Citric Acid with Different Organic Phases

Araújo¹,

Coelho²,

Balarini³

et al. 2017

ACES

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The present work aimed at the study of citric acid solvent extraction in order to establish the composition of the organic phase and to obtain thermodynamic and kinetic data for the chosen system. Discontinuous extraction experiments in a single stage were performed from a synthetic solution of citric acid, with the typical concentration (10% w/v) observed in industrial fermented musts. Exploratory experiments were carried out using different organic phases in order to select the most suitable solvent phase to further continuous extraction tests in a mechanically agitated column. The selected organic phase composition was: Alamine ® 336, Exxal ™ 13 tridecyl alcohol, and the aliphatic diluent Escaid TM 110. Next, the effects of the contact time and of the concentrations of extractant and modifier on the citric acid extraction were studied. Among the investigated conditions, the best one was 10 minutes of contact time, 30% w/v of Alamine ® 336, and 10% w/v of Exxal ™ 13 tridecyl alcohol. For this condition, the equilibrium isotherm (28˚C ± 2˚C) was determined, and the equilibrium constant was calculated ( ). It was considered that trioctylamine and citric acid complexation reaction occurs mainly with non-dissociated citric acid form, because the aqueous feed solutions' pH is lower than the citric acid pK a1 . It was found that 1.5 molecules of the extractant, on average, are required to react with one citric acid molecule, which can indicate that reactions with different extractant/citric acid ratios occur simultaneously. Next, the rate constants for the direct and inverse reactions, 2.10 (mol•L , respectively, were calculated. Coefficients of determination (R 2 ) values higher than 0.93 were found in these calculations, suggesting that the results obtained using a computer modeling would be very close to those results obtained experimentally. Therefore, the present work provides data required to future modelling, design, and simulation of citric acid solvent extraction processes.How to cite this paper: Araújo, E.M.R.,

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Reactive extraction of citric acid using supercritical carbon dioxide

Cited by 28 publications

References 19 publications

Modern Extraction and Purification Techniques for Obtaining High Purity Food-Grade Bioactive Compounds and Value-Added Co-Products from Citrus Wastes

Modern Extraction and Purification Techniques for Obtaining High Purity Food-Grade Bioactive Compounds and Value-Added Co-Products from Citrus Wastes

Innovative Approaches for Recovery of Phytoconstituents from Medicinal/Aromatic Plants and Biotechnological Production

Solvent Extraction of Citric Acid with Different Organic Phases

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