Sanchez Ochoa, J.
and Ewing, M.
(2005),
Vapor pressures of n-heptane determined by comparative ebulliometry, Journal of Chemical and Engineering Data, [online], https://doi.org/10.1021/je049562e (Accessed May 8, 2026)
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Vapor pressures of n-heptane determined by comparative ebulliometry
Published
Author(s)
, Michael B. Ewing
Abstract
The vapor pressures of n-heptane have been measured using comparative ebulliometry with water as the reference substance. The measurements cover the temperature and pressure range 372 K and 102 kPa to 537 K and 2621 kPa and were correlated by a Wagner type equation with a standard deviation of 16 Pa in the vapor pressure. The critical pressure was treated as an adjustable parameter and the value pc = 2734 kPa was obtained using a selected critical temperature, Tc = 540.13 K. The calculated normal boiling temperature is Tb = 371.552 K and an extrapolation to the triple point pressure at Ttp = 182.59 K predicts a pressure, ptp = 0.178 Pa.Citation
Journal of Chemical and Engineering Data
Volume
50
Issue
5
Pub Type
Journals
Download Paper
Keywords
Comparative Ebulliometry, critical point, n-heptane, normal boiling point, triple point, Vapor Pressures, Wagner equations
Citation
Issues
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Created July 12, 2005, Updated October 12, 2021