Density of Cottonseed Oil and Biodiesel

Abstract

The cottonseed oil (CSO) extraction and processing areas including biodiesel (CSB) production created the need for density availability over wide ranges of temperature and pressure. In this work, densities of CSO and CSB were measured. The measurement of CSO density under pressure has never been reported in the literature. To address this limitation, this work reports new experimental data of densities of CSO measured at temperatures from 278 to 358 K and pressures from atmospheric up to 30 MPa using a vibrating tube densimeter. The measured densities of CSO were correlated with the Goharshadi−Morsali−Abbaspour equation of state (GMA EoS) with an absolute average relative deviation of 0.02%. The coefficients of GMA EoS for CSO and CSB were used to calculate the thermal expansivity and isothermal compressibility which influence power and fuel injection and they are rarely presented for vegetable oils and biodiesel, especially at high pressures. The group contribution method GCVOL, Halvorsen model, and Zong fragmentbased approach were used to evaluate the predictive abilities of CSO density data. Good predictions of oil densities were achieved with Halvorsen model for which absolute deviations are in the range of uncertainty of the measurements.

Viscosity of Cottonseed Oil and Biodiesel

“…Macovei measured the dynamic viscosity in the range 288.15 to 373.15 K. Eryilmaz et al . measured the kinematic viscosity of CSO in the range 298.15 to 373.15 K, and the dynamic viscosities were obtained from the densities calculated by GMA EoS, for which parameters were reported in our previous work . Rawitsch reported measurements in the range 303 K to 363 K and Boekenoogen from 303 K to 323 K. Wakeham and Magne studied the dynamic viscosity of deodorized cottonseed oil and hydrogenated cottonseed oils.…”

“… a Values considering the weight fraction of free fatty acids (FFA) reported in Table . The mean values of weight fractions of oleic and linoleic acids were considered in the calculations, and the normalization procedure was realized. b From gas chromatography …”

“…The application of eqs 12 to 14 need the knowledge of the triglyceride profile of the oil, and thus, MTGA, STGA, and PTGA approximations can be used in this context, as explained in our previous work. 24 3.2.2. Grunberg−Nissan.…”

“…The mean values of weight fractions of oleic and linoleic acids were considered in the calculations, and the normalization procedure was realized. b From gas chromatography 24. …”

Density Measurements and PC-SAFT Modeling for Beef Tallow Fatty Acid Methyl Esters (FAME Mixture) + Alkane up to 70 MPa

“…Ivanišet al 34 studied densities and derived the thermodynamic properties of sunflower oil (constituted by fatty acid alkyl esters) and lard (produced from transesterification with methanol) biodiesels at pressures up to 60 MPa. Talavera-Prieto et al 35 measured densities of cottonseed oil biodiesel at temperatures from 278 to 358 K and pressures up to 30 MPa. NguyenThi et al 36 determined densities of waste cooking oil biodiesel and blends with diesel over ranges of the pressure of 0.1−140 MPa and temperature 293.15−353.15 K. Bessieres et al 37 studied the density of three algal biodiesels at high temperatures and pressures.…”