VAPOR-LIQUID CRITICAL-TEMPERATURES AND PRESSURES OF NORMAL-ALKANES WITH FROM 19 TO 36 CARBON-ATOMS, NAPHTHALENE AND M-TERPHENYL DETERMINED BY THE PULSE-HEATING TECHNIQUE

The paper presents the results of measuring the critical temperatures and the critical pressures of normal alkanes: nonadecane, eicosane, do cosane, tetracosane, hexacosane, octacosane, triacontane, hexatriacont ane, and also naphthalene and m-terphenyl. The pulse-heating method of a wire probe immersed in the liquid under investigation applicable to thermally unstable substances has been used. Equations of state of a polymeric fluid of the van der Waals and Redlich-Kwong type have been written in a 'self-consistent-fieId' approximation. Dependences of the critical constants of chain molecules on the number of links have bee n obtained. Equations for calculating the critical temperatures and pr essures of normal alkanes have been derived. The results of calculatio ns are compared with experimental data. (C) 1997 Elsevier Science B.V.