Boiling point of five new sulfur-free odorants for LPG, 1-pentyne, cyclopentene, 1-hexyne, 2-hexyne and 1,5-cyclooctadiene, and bubble point pressures of binaries with Propane5

Abstract

Boiling point and bubble point pressure in binaries with propane were measured for five compounds: 1-pentyne, cyclopentene, 1-hexyne, 2-hexyne, and 1,5-cyclooctadiene, new sulfur-free odorants for LPG. The boiling point was measured with an ebulliometer under atmospheric pressure. The experimental boiling points were 313.51 K, 313.76 K, 344.53 K, 357.59 K, and 424.02 K for 1-pentyne, cyclopentene, 1-hexyne, 2-hexyne, and 1,5-cyclopentadiene, respectively. The experimental boiling points were used for estimation of critical temperature, critical pressure, and acentric factor by Lydersen’s group contribution method to evaluate the two constants in the Peng-Robinson equation-of-state. The Peng-Robinson equation could correlate the bubble point pressure to the mole fraction of propane with absolute relative deviation of less than 2.556%. The data will be useful in the development of fuel cells with reformers for LPG.