Production of Biodiesel at the Kinetic Limit in a Centrifugal Reactor/Separator

McFarlane, Joanna; Tsouris, Costas; Jr, Joseph F Birdwell; Schuh, D.; Jennings, Hal L; Boitrago, Amy M. Palmer; Terpstra, S.

doi:10.1021/ie901229x

Cited by 26 publications

(19 citation statements)

References 23 publications

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“…However, the creation of biomass flocs can jeopardize cell recycle and fermentation performance. Furthermore, other technologies such as mechanical coalescers (van Aken et al, 2003) or centrifugal contactor separator (McFarlane et al, 2010;Oh et al, 2012) could be implemented together with the addition of CaCl 2 to improve oil recovery from multiphasic fermentations.…”

Section: Comparison Of Three Enhancement Oil Recovery Methods When Using Flocculants During Fermentation At Lab Scalementioning

confidence: 99%

Impact of flocculant addition in oil recovery from multiphasic fermentations

Basto

Jiménez

Mudde

et al. 2020

Food and Bioproducts Processing

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Emulsion formation is a major concern when dealing with multiphasic fermentations. Flocculants can be used together with other demulsification techniques to improve oil recovery in multiphasic fermentations. In this paper, the impact of adding flocculants during a multiphasic fermentation with 10 wt% dodecane, to destabilize the broth emulsion, improve creaming formation and enhance oil recovery is studied. Flocculants, CaCl 2 and (NH 4 ) 2 SO 4 were shown to be the most promising flocculants. Flocculant addition, their time of addition, and its impact on multiphasic fermentations has been evaluated by comparing fermentation performance against reference fermentations and three oil recovery methods: gravity settling, gas enhanced oil recovery and centrifugation. When adding 75 mM of (NH 4 ) 2 SO 4 during fermentation, the creaming rate during gravity settling increased 3-fold and the oil recovery by gas enhanced oil recovery was 35%, without altering fermentation performance.Addition of CaCl 2 during fermentation resulted in 88% and 67% oil recovery for early and late addition, which is a 4 and 3-fold increase in comparison with the reference. Yet, CaCl 2 deviated from standard fermentation performance when added immediately after second phase addition. In conclusion, flocculant addition during multiphasic fermentation can be used to destabilize microbial emulsions and potentially improve in situ oil recovery.

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Section: Comparison Of Three Enhancement Oil Recovery Methods When Using Flocculants During Fermentation At Lab Scalementioning

confidence: 99%

Impact of flocculant addition in oil recovery from multiphasic fermentations

Basto

Jiménez

Mudde

et al. 2020

Food and Bioproducts Processing

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“…Effective phase separation, even for relatively small density differences, can be achieved by continuous-flow centrifuges. One such device is the centrifugal contactor (McFarlane et al, 2010), which combines a shear regime for intimate contact between two liquid phases to facilitate mass transfer and a phase separation regime where a centrifugal force is utilized to separate the two phases. Because it combines effective mixing of two liquids and phase separation, this device has been described in the literature (Kim et al, 2017) as a process intensification device.…”

Section: Density-based Separationsmentioning

confidence: 99%

Efficient Conversion of Aqueous-Waste-Carbon Compounds Into Electrons, Hydrogen, and Chemicals via Separations and Microbial Electrocatalysis

et al. 2018

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Valorization of waste streams is becoming increasingly important to improve resource recovery and economics of bioprocesses for the production of fuels. The pyrolysis process produces a significant portion of the biomass as an aqueous waste stream, called bio-oil aqueous phase (BOAP), which cannot be effectively converted into fuel. In this report, we detail the separation and utilization of this stream for the production of electrons, hydrogen, and chemicals, which can supplement fuel production improving economics of the biorefinery. Separation methods including physical separation via centrifugal separator, chemical separation via pH manipulation, and electrochemical separation via capacitive deionization are discussed. Bioelectrochemical systems (BES) including microbial fuel cells (MFCs), microbial electrolysis cells (MECs), and electrofermentation processes are reviewed for their potential to generate current, hydrogen, and chemicals from BOAP. Recent developments in MECs using complex waste streams and electro-active biocatalyst enrichment have resulted in advancement of the technology toward performance metrics closer to commercial requirements. Current densities above 10 A/m 2 have been reported using BOAP, which suggest further work to demonstrate the technology at pilot scale should be undertaken. The research on electro-fermentation is revealing potential to generate alcohols, diols, medium chain fatty acids, esters, etc. using electrode-based electrons. The ability to derive electrons and chemical building blocks from waste streams illustrate the advancement of the BES technology and potential to push the frontiers of bioenergy generation one step further toward development of a circular bioeconomy.

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“…Commercial processing of biodiesel through homogeneous catalysis suffers from high feedstock costs and batch processing that requires long residence times to achieve good conversion. Hence, ongoing research continues to explore methods how to best use low-quality feedstocks, and to reduce the reagent requirements, energy usage, processing time, and complexity [8]. Figure 1 shows results from simulation of a continuous process to make biodiesel, varying temperature (a) and methanol content (b) to determine conditions for the optimal production of high quality grade biodiesel.…”

Section: Fuelsmentioning

confidence: 99%