Thermophysical behavior of three algal biodiesels over wide ranges of pressure and temperature

The knowledge of density and viscosity is important both for the optimization of diesel engines operation and the fuel quality specification. To this end, the present work focuses on the study of these thermophysical properties for three algal biodiesels. The samples were produced by transesterifica...

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Bibliographic Details
Published in:Fuel (Guildford) 2018-12, Vol.233, p.497-503
Main Authors: Bessières, D., Bazile, J.-P., Tanh, X. Nguyen Thi, García-Cuadra, F., Acien, F.G.
Format: Article
Language:English
Subjects:
Algae
Applied geology
Biodiesel
Biodiesel fuels
Biofuels
Chemical Physics
Compressibility
Cyanobacteria
Density
Diesel
Diesel engines
Earth Sciences
Engineering Sciences
Freshwater microorganisms
Geophysics
Internal combustion engines
Marine engines
Marine microorganisms
Marine propulsion
Mechanics
Microalgae
Microorganisms
Optimization
Oxidation
Oxidation process
Physics
Reproducibility
Sciences of the Universe
Shelf life
Specifications
Spirulina platensis
Stability analysis
Storage stability
Thermal expansion
Thermophysical properties
Transesterification
Viscosity
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Summary:The knowledge of density and viscosity is important both for the optimization of diesel engines operation and the fuel quality specification. To this end, the present work focuses on the study of these thermophysical properties for three algal biodiesels. The samples were produced by transesterification of dry biomass supplied from different microorganisms, the marine strain Nannochloropsis gaditana, the freshwater strain Scenedesmus almeriensis and the freshwater cyanobacteria Spirulina platensis. The protocol of production is detailed. The purity of biodiesels is low, ranging from 63,7% to 68,1% because the produced biodiesel was not purified in order to evaluate the characteristics of the crude biodiesel produced from microalgae. The relative new technique based on a simple process is attractive for an industrial point of view. The (FAMEs) profile of the biodiesels were characterized using a GC–MS technique. The density measurements were performed over expanded ranges of pressure [0,1–140 (MPa)] and temperatures [293,15 (K)–353,15 (K)] compatibles with their engines applications. The isothermal compressibility and the isobaric thermal expansion were estimated within the same experimental range by density differentiation. The cinematic viscosity was also measured for the three biodiesels at atmospheric pressure for temperatures ranging from 293.15 (K) to 353.15 (K). The storage stability of the biodiesels was assessed in terms of reproducibility of the measured properties. Spirulina biodiesel was not affected by oxidation process. Additionally, its density and viscosity values meet the standards specifications that support the use of this production process.
ISSN:0016-2361
1873-7153
DOI:10.1016/j.fuel.2018.06.091