in the absence of oxygen. Three concepts of multistage cross-current
extraction were investigated and compared: conventional multistage
maceration, ultrasound-assisted maceration and a combination, to
assess the positive impact of using ultrasound on the seed oil extraction process. The study concludes that ultrasound-assisted extraction
of oil is likely to reduce both economic and ecological impacts of the
process in the fat and oil industry.
Energy requirements for wet solvent
extraction of lipids from microalgal biomass
Martin, G.J.O., Bioresour. Technol. 205: 40–47, 2016,
Biofuel production from microalgae requires energy efficient
processes for extracting and converting triacylglyceride lipids to
fuel, compatible with coproduction of protein feeds and nutraceuticals. Wet solvent extraction involves mechanical cell rupture, lipid
extraction via solvent contacting, physical phase separation, thermal
solvent recovery, and transesterification. A detailed analysis of the
effect of key process parameters on the parasitic energy demand of
this process was performed. On a well-to-pump basis, between 16%
and 320% of the resultant biodiesel energy was consumed depending
solely on the process parameters. Highly positive energy balances
can be achieved, but only if a correctly designed process is used. This
requires processing concentrated biomass (ca 25% w/w) with a high
triacylglyceride content (ca 30% w/w), and an efficient extraction
process employing a non-polar solvent, low solvent-to-paste ratio,
and efficient energy recovery. These requirements preclude many
laboratory scale processes and polar co-solvents as viable options for
large-scale biofuel production.
Microalgae from domestic wastewater
facility’s high rate algal pond:
lipids extraction, characterization
and biodiesel production
Drira, N., A. Piras, A. Rosa, S. Porcedda, and H. Dhaouad, Bioresour.
Technol. 206: 239–244, 2016,
In this study, the harvesting of a biomass from a high rate algal
pond (HRAP) of a real-scale domestic wastewater treatment facility
and its potential as a biomaterial for the production of biodiesel were
investigated. Increasing the medium pH to 12 induced high flocculation efficiency of up to 96% of the biomass through both sweep flocculation and charge neutralization. Lipids extracted by ultrasounds
from this biomass contained around 70% of fatty acids, with palmitic
and stearic acids being the most abundant. The extract obtained by
supercritical CO2 contained 86% of fatty acids. Both conventional
solvents extracts contained only around 10% of unsaturated fats,
whereas supercritical CO2 extract contained more than 40% of
unsaturated fatty acids. This same biomass was also subject to direct
extractive-transesterification in a microwave reactor to produce fatty
acid methyl esters, also known as, raw biodiesel.
Sowing the seeds of your success. When it comes to oilseed preparation, Bühler is the natural choice. The
company offers high-availability, low-downtime technology for the preparation of soy, rapeseed, sunflower and
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your total cost of ownership, maximize extraction yield and deliver success that is sustainable in the fullest sense.
Bühler Inc., PO Box 9497, Minneapolis, MN 55440, T 763-847-9900
The Flaking Mill delivers:
• Up to 500 t/day capacity.
• 3. 5 m2 less net plant area per installed flaker.
• 15% less power requirement.
• Flake thickness adjustment during operation.
• Integrated mixer and feeder for even product
• Oil loss reduction of 15 t/year.
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Visit us at the 107th AOCS Annual Meeting & Expo, May 1-4, 2016 in Salt Lake City, Utah.
Salt Palace Convention Center, Booth 304
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