Extraction Equilibria of Formic and Acetic Acids from Aqueous Solution by Phosphate-Containing Extractants

Cai, Weibin; Zhu, Shenlin; Piao, Xianglan

doi:10.1021/je010117i

Cited by 64 publications

(44 citation statements)

References 7 publications

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“…This is the first report of the successful use of this extraction strategy on FA. Formic acid is the simplest carboxylic acid and used as preservative and anti-bacterial agent in food and pharmaceutical applications (Cai et al, 2001). Moreover, it is widely used in tanning, coloring and cleaning steps of leather and textile industries (Martı and Oflaz, 2013).…”

Section: Introductionmentioning

confidence: 99%

Recovery of Formic Acid by Reactive Extraction Using an Environmentally-Friendly Solvent

Martı¹

2017

Scitech

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Today many carboxylic acids are recovered from biological production media and industrial wastewaters. Reactive extraction is favored over other separation methods due to its high recovery efficiency, ease of operation, low energy demand and reduced cost. However, use of toxic organic diluents in the organic phases is the main disadvantage of the method. In this study, the appropriateness of an environmentally-friendly solvent, sunflower oil (SFO) to be used as organic phase diluent during the recovery of formic acid (FA) from aqueous solutions by reactive extraction was evaluated. Alamine-336 was used as the extractant and the results obtained with SFO were compared with those obtained using octanol. The separation process reached an equilibrium in 3 hours and the recovery efficiency increased with the increase in extractant percentages. The initial FA concentration positively influenced the recovery when SFO was used as the diluent. In the ranges of the parameters studied, the highest recovery values were 98.6% and 82.6% with octanol and SFO, respectively. This study shows that low molecular weight carboxylic acids, e.g. FA can be recovered from aqueous solutions by reactive extraction using environmentally-friendly solvents such as SFO. Key Words: Formic acid, Reactive extraction, Sunflower oil, Alamine-336, EquilibriumFormik Asidin Çevre Dostu Bir Çözücü Kullanılarak Tepkimeli Özütleme Yöntemi ile Geri Kazanımı ÖZ: Günümüzde pek çok karboksilik asit biyolojik üretim ortamlarından ve endüstriyel atık sulardan geri kazanılmaktadır. Tepkimeli özütleme, yüksek geri kazanım verimi, işlem basitliği, düşük enerji gereksinimi ve maliyeti nedeniyle diğer ayırma yöntemlerine tercih edilmiştir. Fakat organik fazlarda zehirli organik seyrelticilerin kullanımı yöntemin en önemli dezavantajıdır. Bu çalışmada çevre dostu bir çözücünün, ayçiçek yağının formik asidin sulu çözeltilerinden tepkimeli özütleme yöntemi ile geri kazanımı sırasında organik faz seyrelticisi olarak zehirli organik kimyasallar yerine kullanımı değerlendirilmiştir. Özütleyici olarak Alamine-336 kullanılmış ve ayçiçek yağı ile elde edilen sonuçlar oktanol ile elde edilen sonuçlarla karşılaştırılmıştır. Ayırma süreci 3 saatte dengeye ulaşmış ve geri kazanım verimi özütleyici yüzdesi ile birlikte artmıştır. Ayçiçek yağı seyreltici olarak kullanıldığında başlangıç asit derişimi geri kazanımı pozitif yönde etkilemiştir. Çalışılan değişken aralıklarında oktanol ve ayçiçek yağı ile en yüksek geri kazanım verimleri sırasıyla %98,6 ve %82,6'dır. Bu çalışma formik asit gibi düşük molekül ağırlıklı karboksilik asitlerin tepkimeli özütleme ile ayçiçek yağı gibi çevre dostu çözücüler kullanılarak sulu çözeltilerden geri kazanılabileceğini göstermiştir.

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Section: Introductionmentioning

confidence: 99%

Recovery of Formic Acid by Reactive Extraction Using an Environmentally-Friendly Solvent

Martı¹

2017

Scitech

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“…Vacuum membrane distillation has also been reported to decrease the concentration of acetic acid and furfural in the corn stover hydrolysate . Although liquid–liquid extraction is the most efficient approach and has a prior history of use including acetic acid from aqueous solutions; toxicity of the solvent itself can result in potential limitations . Amine and phosphine based solvents with different diluents and trioctylphosphine oxide (TOPO) are effective in extracting acetic acid from hydrolysates .…”

Section: Introductionmentioning

confidence: 99%

Acetic acid removal from corn stover hydrolysate using ethyl acetate and the impact on Saccharomyces cerevisiae bioethanol fermentation

Aghazadeh

Ladisch

Engelberth

2016

Biotechnology Progress

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Acetic acid is introduced into cellulose conversion processes as a consequence of composition of lignocellulose feedstocks, causing significant inhibition of adapted, genetically modified and wild-type S. cerevisiae in bioethanol fermentation. While adaptation or modification of yeast may reduce inhibition, the most effective approach is to remove the acetic acid prior to fermentation. This work addresses liquid-liquid extraction of acetic acid from biomass hydrolysate through a pathway that mitigates acetic acid inhibition while avoiding the negative effects of the extractant, which itself may exhibit inhibition. Candidate solvents were selected using simulation results from Aspen Plus™, based on their ability to extract acetic acid which was confirmed by experimentation. All solvents showed varying degrees of toxicity toward yeast, but the relative volatility of ethyl acetate enabled its use as simple vacuum evaporation could reduce small concentrations of aqueous ethyl acetate to minimally inhibitory levels. The toxicity threshold of ethyl acetate, in the presence of acetic acid, was found to be 10 g L(-1) . The fermentation was enhanced by extracting 90% of the acetic acid using ethyl acetate, followed by vacuum evaporation to remove 88% removal of residual ethyl acetate along with 10% of the broth. NRRL Y-1546 yeast was used to demonstrate a 13% increase in concentration, 14% in ethanol specific production rate, and 11% ethanol yield. This study demonstrated that extraction of acetic acid with ethyl acetate followed by evaporative removal of ethyl acetate from the raffinate phase has potential to significantly enhance ethanol fermentation in a corn stover bioethanol facility. © 2016 American Institute of Chemical Engineers Biotechnol. Prog., 32:929-937, 2016.

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“…Hence, electron-donating capability of phosphate-containing extractants was much greater than that of aliphatic alcohol. But for TBP and TRPO, with the alkoxy groups and alkyl groups (R = hexyl or R = octyl) linking to the phosphorus atom respectively, P O bond in TRPO became a much stronger electron donor through inductive effects [21]. Therefore, the sequence order of electron-donating capability of different extractants could be TRPO > TBP > 2-ethyl hexanol.…”

Section: Three-liquid-phase Extraction Profiles Of Ga and Lq With Difmentioning

confidence: 99%

Separation of glycyrrhizic acid and liquiritin from Glycyrrhiza uralensis Fisch extract by three-liquid-phase extraction systems

Shen

Chang

et al. 2007

Separation and Purification Technology

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Extraction Equilibria of Formic and Acetic Acids from Aqueous Solution by Phosphate-Containing Extractants

Cited by 64 publications

References 7 publications

Recovery of Formic Acid by Reactive Extraction Using an Environmentally-Friendly Solvent

Recovery of Formic Acid by Reactive Extraction Using an Environmentally-Friendly Solvent

Acetic acid removal from corn stover hydrolysate using ethyl acetate and the impact on Saccharomyces cerevisiae bioethanol fermentation

Separation of glycyrrhizic acid and liquiritin from Glycyrrhiza uralensis Fisch extract by three-liquid-phase extraction systems

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