Predicting the adsorption of second generation biofuels by polymeric resins with applications for in situ product recovery (ISPR)

Nielsen, David R.; Amarasiriwardena, Gihan S.; Prather, Kristala L. J.

doi:10.1016/j.biortech.2009.12.003

Cited by 52 publications

(59 citation statements)

References 45 publications

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“…In addition, Nielsen et al [23] found that the adsorption of organic acids onto GAC or weakly basic anionic resins like Amberlite ® IRA-67 is dominated at a pH below the pK a value of the acids, which was also observed for the RLX425 resin in this study (Figure 1b). RLX425 is a weakly-basic resin that has a pyridine functional group and the lone electron pair of the nitrogen atom allows it to form hydrogen bonds with the lactate ion [12].…”

Section: Effect Of Ph and Adsorbent Dose On The Lactic Acid Adsorptiosupporting

confidence: 58%

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Adsorption Behaviour of Lactic Acid on Granular Activated Carbon and Anionic Resins: Thermodynamics, Isotherms and Kinetic Studies

et al. 2017

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Solid-liquid extraction (adsorption or ion exchange) is a promising approach for the in situ separation of organic acids from fermentation broths. In this study, a diluted concentration of lactic acid (<10 g/L) separation from a model fermentation broth by granular activated carbon (GAC) as well as weak (Reillex ® 425 or RLX425) and strong (Amberlite ® IRA-400 or AMB400) base anion exchange resins under various operating conditions was experimentally investigated. Thermodynamic analysis showed that the best lactic acid adsorption performances were obtained at a pH below the pK a value of lactic acid (i.e., 3.86) for GAC and RLX425 by physical adsorption mechanism and above the pK a value for the AMB400 resin by an ion exchange mechanism, respectively. The adsorption capacity for GAC (38.2 mg/g) was the highest, followed by AMB400 (31.2 mg/g) and RLX425 (17.2 mg/g). As per the thermodynamic analysis, the lactic acid adsorbed onto GAC and RLX425 through a physical adsorption mechanism, whereas the lactic acid adsorbed onto AMB400 with an ion exchange mechanism. The Langmuir adsorption isotherm model (R 2 > 0.96) and the pseudo-second order kinetic model (R 2~1 ) fitted better to the experimental data than the other models tested. Postulating the conditions for the real fermentation broth (pH: 5.0-6.5 and temperature: 30-80 • C), the resin AMB400 represents an ideal candidate for the extraction of lactic acid during fermentation.

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Section: Effect Of Ph and Adsorbent Dose On The Lactic Acid Adsorptiosupporting

confidence: 58%

“…Most of the anionic resins are non-toxic to microorganisms and can thus be used directly in the fermenter [23]. Activated carbon has a wider application in the field of water and wastewater treatment due to its highly porous structure with a large surface area (~1100 m 2 /g).…”

Section: Introductionmentioning

confidence: 99%

Adsorption Behaviour of Lactic Acid on Granular Activated Carbon and Anionic Resins: Thermodynamics, Isotherms and Kinetic Studies

et al. 2017

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“…The best current practice claims a maximum concentration of ethanol in the reactor of 5% 26,47 . Due to this well known disadvantage, new systems are in development to adsorb ethanol from the water during the synthesis reducing the concentration so that the bacteria can produce more ethanol 48 . Thus, we have also analyzed the value of 15% as a critical maximum to evaluate the effect of future improvements in the field and the feasibility of the designs.…”

Section: Synthesismentioning

confidence: 99%

“…Ideally, the concentration of ethanol in the reactor should be above 15%. New technologies are in the development stage to capture the ethanol as it is produced so that the actual concentration in the liquid remains low (Nielsen and Prather, 2009). However, its applicability to industrial processes is still far into the future.…”

Section: Structural Decisions and Heat Integrationmentioning

confidence: 99%

Energy optimization of bioethanol production via gasification of switchgrass

2011

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Abstract.In this paper, we address the conceptual design of the bioethanol process from switchgrass via gasification. A superstructure is postulated for optimizing energy use that embeds direct or indirect gasification, followed by steam reforming or partial oxidation. Next, the gas composition is adjusted with membrane-PSA or water gas shift. Membrane separation, absorption with ethanol-amines and PSA are considered for the removal of sour gases. Finally, two synthetic paths are considered, high alcohols catalytic process with two possible distillation sequences, and syngas fermentation with distillation, corn grits, molecular sieves and pervaporation as alternative deshydration processes. The optimization of the superstructure is formulated as an MINLP problem using short-cut models, and solved through a special decomposition scheme that is followed by heat integration.The optimal process consists of direct gasification followed by steam reforming, removal of the excess of hydrogen and catalytic synthesis, yielding a potential operating cost of $0.41/gal

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“…[22] suggested adsorption to be a more viable separation method for biological products where polymeric resins were reported by [23] to be used for the ISPR of second-generation biofuels. Adsorption of p-cresol by different types of adsorbents in the applications of hemodialysis, wastewater treatment and as first-principle adsorption study was reported by various authors in Table 1.…”

Section: Introductionmentioning

confidence: 99%

In-situ Product Recovery as a Strategy to Increase Product Yield and Mitigate Product Toxicity

Ng¹,

Kuek²

2013

TOBIOTJ

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Product inhibition is often the cause limiting the maximum product concentration attainable in fermentation. This study showed the product yield of p-cresol could be improved by in-situ product recovery (ISPR). Escherichia coli transformed with the hpd BCA operon from Clostridium difficile was shown in this study to express phydroxyphenylacetate decarboxylase which converted p-hydroxyphenylacetate into p-cresol under anaerobic fermentation. Toxicity of p-cresol found at a concentration as low as 5 mM in a broth spiked with p-cresol was shown to have limited the maximum product concentration at 1 ± 0.1 mM after 30 hours of batch fermentation. Product yield was however shown to increase by 51% when activated carbon was used to remove p-cresol in-situ production. The activated carbon concentrated p-cresol on the solid adsorbent which was subsequently separated by sedimentation and p-cresol recovered by ultrasonic-assisted solvent extraction. Desorption of p-cresol from the spent activated carbon allowed the adsorbent to be regenerated for further product recovery. The ISPR strategy reported here was shown to improve the yield of a toxic product, was sustainable, and when adapted to a continuous process would increase productivity.

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Predicting the adsorption of second generation biofuels by polymeric resins with applications for in situ product recovery (ISPR)

Cited by 52 publications

References 45 publications

Adsorption Behaviour of Lactic Acid on Granular Activated Carbon and Anionic Resins: Thermodynamics, Isotherms and Kinetic Studies

Adsorption Behaviour of Lactic Acid on Granular Activated Carbon and Anionic Resins: Thermodynamics, Isotherms and Kinetic Studies

Energy optimization of bioethanol production via gasification of switchgrass

In-situ Product Recovery as a Strategy to Increase Product Yield and Mitigate Product Toxicity

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