Isobaric pseudo-binary cross section of mixtures (naphthalene + multiparaffinic wax)

Abstract The thermodynamic behaviour and structural evolution of 13 different mixtures of a multiparaffinic wax with a molar concentration distribution of the normal logarithmic type (Prolabo 52–54 °C) and (C 10 H 8 )—naphthalene were investigated at temperatures ranging from 288.15 to 373.15 K. The wax and (C 10 H 8 )—naphthalene are not miscible in the solid state but show co-solubility in the liquid state. The diagram representing the isobaric pseudo-binary (T,x) cross section of the system ((C 10 H 8 )—naphthalene+multiparaffinic wax) displays a curve of crystallization which resembles that of a binary eutectic solidification with an invariant temperature T E =312.25±0.7 K ; below this T E temperature the equilibrium state corresponds to a two-phase domain containing the solid phases of the two compounds ((C 10 H 8 )-naphtalene and multiparaffinic solid solution of wax) separately.