MEASUREMENT OF VAPOR PRESSURE FROM
TERNARY MIXTURE OF
ISOOCTANE-ETHANOL-1-BUTANOL
BY EBULLIOMETER
Name
:
Department
Advisors
:
:
1. Yuliawan
(2306100005)
2. Samsul Arif
(2306100086)
Chemical Engineering FTI-ITS
1. Prof. Dr. Ir. Gede Wibawa, M.Eng
2. Dr. Ir. Kuswandi, DEA
ABSTRACT
Gasohol ( a mixture of ethanol with gasoline ) is
already commercial fuel in USA, Canada and France.
Utilization of ethanol as gasoline additive has several
advantageous: it is octane enhancers, it has significant
properties important for unleaded fuels, it can be produced
from renewable agricultural raw material instead of fossil
sources, and it can be reduce carbonmonoxide pollution from
vehicle exhaust. However, at ethanol concentration used in
gasoline alcohol mixtures, the mixture has higher vapor
pressure than the gasoline, thus raising concern about
evaporative hydrocarbon emissions from the fuel mixtures.
For rational design of gasohol fuel, vapor-liquid equilibrium
(VLE) data of gasoline-alcohols system are necessary. In this
work, ternary VLE data of ethanol-isooctane-1-butanol system
were measured using modified ebulliometer. Isooctane was
used to represent gasoline, since it is the main component of
gasoline. The reability of modified ebulliometer used in this
work was confirmed by comparing the measured VLE with the
literature data for pure isooctane, ethanol and 1-butanol. The
result showed that addition of 1-butanol into ethanol-isooctane
vii mixtures could decrease vapor pressure of the mixture
significantly. The experimental data were correlated with the
Wilson and UNIQUAC equations with average relative
deviation in pressure of 2.8 and 2.5 %, respectively. In
addition, the experimental data were compared with predicted
one using Wilson and UNIQUAC equations with binary
interaction parameters were obtained from pairs of binary
systems only.
Key words : ebulliometer, vapor pressure, UNIQUAC
equation, Wilson equation.
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