Page 77 - Characterization and Properties of Petroleum Fractions

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2. CHARACTERIZATION AND PROPERTIES OF PURE HYDROCARBONS 57
API Gravity

Kinematic Viscosity at 100°F , cSt Kinematic Viscosity at 210°F , cSt Molecular Weight
--`,```,`,``````,`,````,```,,-`-`,,`,,`,`,,`---

FIG. 2.5—Estimation of molecular weight from Eq. (2.52). Taken from Ref. [67] with per-
mission.

2.4.1.5 Goossens Correlation Eq. (2.38) but with a variable b and c =−1. Parameter b is
Most recently Goossens [61] correlated M to T b and d 20 in the considered as a function of T b , while SG in Eq. (2.38) is re-
20
20
◦
following form using the data on 40 pure hydrocarbons and placed by d 4 the specific gravity at 20/4 C(d 4 is the same
3
23 petroleum fractions: as d 20 in g/cm ). The data bank used to develop this equa-
tion covers the carbon range of C 5 –C 120 (M ∼ 70–1700, T b ∼
β
(2.55) M = 0.01077T /d 20 300–1000 K, and d ∼ 0.63–1.08). For the same 63 data points
b 4
used to obtain the constants of Eq. (2.55), the average error
where β = 1.52869 + 0.06486 ln[T b /(1078 − T b )]. Inspection was 2.1%. However, practical application of Eq. (2.55) is lim-
of this equation shows that it has the same structure as ited to much lower molecular weight fractions because heavy

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