| Summary: | 碩士 === 國立台灣工業技術學院 === 化學工程技術研究所 === 85 === The subjects of the present study include measurement of
vapor-liquid equilibria for the highly asymmetric polar
mixtures composed of helium and alkanols,and testing of various
equations of state for their applicability these mixtures.
Vapor-liquid equilibrium (VLE) data were measured for three
binary systems of helium+1-hexanol, helium+1-octanol, and
helium+1-decanol at temperatures from 353.45 K to 453.65 K and
pressures up to 100 bar by using a semi-flow type apparatus. The
solubility of helium in alkanol,as evidence by the experimental
results, increases with pressure and temperature, while the
saturated gas phase composition (mole fraction) of alkanol
component decreases with increasing pressure but increases with
increasing temperature. The magnitude ofthe alkanol compositions
in the saturated gas phase follows the order of 1-hexanol>1-
octanol>1-decanol at a fixed temperature. Henry's constants were
also determined from new isothermal VLE data for each binary
mixture. Three cubicequations of state (Soave , Peng-
Robinson and Patel-Teja) with different mixing rules were
applied to correlate tvapor-liquid equilibrium dataof binary
mixtures composed of helium with a diversity of heavier
compounds.The van derWaals one-fluid mixing rules, with
introduction of a second binary interaction constant (kbij) in
the mixing rule for equation parameter "b",improved
significantly the calculated results overall for any of
equationsof state. Howe ver,the study also found that the values
of the binary interaction constant kaij) were greater than 1,
only the cubic perturbed hard-chain (CPHC) equation of state,
which was developed from approximationo the molecular
simulations, yielded reasonable results.
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