Melt crystallization of binary mixture of fatty acids as model biofuel

Abstract

To account for both the growth of solid layer and solute distribution in melt crystallization, we proposed empirical equations involving heat and mass transfer at the solid‐liquid interface between the solid layer and melt. With the aim of separating saturated fatty acid as a solid phase from binary mixture of fatty acids as model biofuel, we performed melt crystallization by employing three different species of binary melts which contained triglyceride as unsaturated fatty acid, and myristic acid, palmitic acid, or stearic acid as saturated fatty acid, respectively. As a result, we confirmed the validity of the proposed equations under the varied crystallization conditions.

Effect of Taylor Vortex on Melt Crystallization of Fatty Acids

“…We studied the effects of the species and the concentration of a saturated FA on the solute distribution factor of the FAs at the S−L interface. By fitting the factor which we estimated based on the model to the experimental results, the validity of the proposed model was confirmed …”

“…All of the reagents were the GR grade and were purchased from Kanto Chemical Co. The melting point of pure palmitic acid is 336 K …”

“…After completing the formation of the solid formed on the inner cylinder, the weight and the size of the solid, respectively, were measured. The molar fraction of the saturated FA was also determined by measuring the refractive index of the melted solid employing an Abbe refractometer (Atago, Co. Ltd.) at 338 K in the same manner as previously reported . Then, the solute distribution factor, f eff , was calculated on the S−L interface according to the following equation: where x s and x ∞ indicate the molar fractions of the solute, that is, saturated FA, in a solid phase and in a melt phase, respectively.…”

Estudo da cristalização a partir do estado fundido de ácido graxo como material de mudança de fase.

“…A morfologia do cristal formado dependente fortemente das condições do processo de cristalização (YAMAMOTO et al, 2017). Segundo Swamy et al (1985) para longas cadeias orgânicas, como ácidos graxos e ésteres, a morfologia pode ser bem similar a de cadeias de hidrocarbonetos de estruturas simples como os n-alcanos.…”