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Số người truy cập: 106,765,864

 Thermophysical behavior of three algal biodiesels over wide ranges of pressure and temperature
Tác giả hoặc Nhóm tác giả: D. Bessières, J.-P. Bazile, X. Nguyen Thi Thanh, F. García-Cuadra, F.G. Acien
Nơi đăng: Fuel, Elsevier, ISSN 0016-2361; Số: 233;Từ->đến trang: 497-503;Năm: 2018
Lĩnh vực: Kỹ thuật; Loại: Bài báo khoa học; Thể loại: Quốc tế
TÓM TẮT

ABSTRACT
Theknowledgeofdensityandviscosityisimportantbothfortheoptimizationofdieselenginesoperationandthe 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 islow, rangingfrom63,7%to68,1% becausethe producedbiodiesel wasnotpurifiedinordertoevaluate 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 rangebydensitydifferentiation.Thecinematicviscosity wasalsomeasuredforthe threebiodieselsat 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 valuesmeet the standards specifications thatsupport the use of this production process.
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