Biomass conversion to hydrocarbon fuels using the MixAlco™ process at a pilot-plant scale

Taco-Vasquez, Sebastian; Dunkleman, John J.; Chaudhuri, Suhnrita; Bond, Austin; Holtzapple, Mark T.

doi:10.1016/j.biombioe.2014.01.005

Cited by 28 publications

(20 citation statements)

References 7 publications

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“…The process model for producing carboxylates by bacterial fermentation of sugarcane residues was taken as a pre‐defined process for the pre‐treatment and fermentation process, and applied for all downstream alternatives. The flowsheet for recovery as ketones considers one process that is well established in literature with pilot demonstrations, while the recovery of carboxylates as VFAs considers alternatives for the acidification and separation steps that are summarized in Table .…”

Section: Introductionmentioning

confidence: 99%

Comparison of recovery of volatile fatty acids and mixed ketones as alternative downstream processes for acetogenisis fermentation

Petersen

Franco

Görgens

2018

Biofuels Bioprod Bioref

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Carboxylates produced by the acetogenisis fermentation of pre‐treated lignocelluloses are precursors to bio‐based products that are alternatives to second‐generation biofuels for biomass valorization. This paper compares the techno‐economic indicators for recovering either mixed ketones or mixed volatile fatty acid (VFA) products from the carboxylates in a fermentation broth through process simulation and financial modeling. This study considers scenarios for (i) an efficient process for ketone production (K‐P) involving dehydration, thermal conversion, and condensation already established in the literature; (ii) VFA production (VFA‐P) with conventional methods of carboxylate acidification and separation; and (iii) advanced VFA acidification and separation methods. In conventional acidification, using mineral acids and calcium alkalis results in wastes; while in advanced acidification, the acids and bases are regenerated. Conventional separation relies on ethyl‐acetate extraction, while advanced separation relies on amine extraction. Scenarios are compared in terms of energy and chemical use, and the internal rates of return (IRR) determined with price ranges assumed for mixed VFAs and mixed ketones. Thus, with optimistic product prices, K‐P and VFA‐P with conventional acidification‐separation have indentical IRRs at 35%, but K‐P is favorable due to the chemical‐intensiveness and waste generation of the VFA‐P. Using advanced acidification and separation could possibly improve the IRR of VFA‐P to 39%, with a capital investment of 2% above that of K‐P, which was estimated at US$ 293 million. Otherwise, a previously patented scheme that integrated acidification and separation based on amine complexation could also produce a VFA process that is environmentally and economically feasible. © 2018 Society of Chemical Industry and John Wiley & Sons, Ltd

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Section: Introductionmentioning

confidence: 99%

Comparison of recovery of volatile fatty acids and mixed ketones as alternative downstream processes for acetogenisis fermentation

Petersen

Franco

Görgens

2018

Biofuels Bioprod Bioref

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“…The concentrations of monocarboxylic acids (acetic, propionic, butyric, valeric, hexanoic, heptanoic, and octanoic) in fermentation broths were determined using gas chromatography with a flame ionization detector (GC-FID) using a Shimazdu 2010 GC System (Shimazdu Co., Kyoto, Japan) equipped with an AOC-20i autosampler. The GC column was a high-performance capillary column with dimensions of 30 m × 0.53 mm × 1.00 μm (Zebron ZB-FFAP, Phenomenex, Torrance, CA) for underivatized acids and alcohols ( Vasquez et al, 2014 ; Chwialkowska et al, 2019 ). Samples were diluted with a dilute phosphoric acid solution prior to sampling.…”

Section: Methodsmentioning

confidence: 99%

Mixed Acid Fermentation of Carbohydrate-Rich Dairy Manure Hydrolysate

Ingle

Fortney

Walters

et al. 2021

Front. Bioeng. Biotechnol.

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Dairy manure (DM) is an abundant agricultural residue that is largely composed of lignocellulosic biomass. The aim of this study was to investigate if carbon derived from DM fibers can be recovered as medium-chain fatty acids (MCFAs), which are mixed culture fermentation products of economic interest. DM fibers were subjected to combinations of physical, enzymatic, chemical, and thermochemical pretreatments to evaluate the possibility of producing carbohydrate-rich hydrolysates suitable for microbial fermentation by mixed cultures. Among the pretreatments tested, decrystalization dilute acid pretreatment (DCDA) produced the highest concentrations of glucose and xylose, and was selected for further experiments. Bioreactors fed DCDA hydrolysate were operated. Acetic acid and butyric acid comprised the majority of end products during operation of the bioreactors. MCFAs were transiently produced at a maximum concentration of 0.17 mg CODMCFAs/mg CODTotal. Analyses of the microbial communities in the bioreactors suggest that lactic acid bacteria, Megasphaera, and Caproiciproducens were involved in MCFA and C4 production during DCDA hydrolysate metabolism.

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“…The main difference between the two digesters was that digester PPW-FR-1 responded quicker on VFA production and degradation. Although relative higher VFAs accumulation was observed in digesters at the end of reaction, these VFAs can be treated as useful chemical precursors for renewable fuels and biodegradable plastic polyhydroxyalkanoate production (Vasquez et al, 2014;Wei et al, 2014Wei et al, , 2015b. Table 3 gives the properties of three digesters (PPW-1, PPW-FR-1, and blank) at the beginning and the end of 40 days digestion.…”

Section: Digester Performancementioning

confidence: 98%