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The New Jersey Institute of Technology's
Electronic Theses & Dissertations Project

Title: Absolute viscosity of the n-paraffin liquids
Author: Permutt, Gerald
View Online: njit-etd1960-001
(vii, 42 pages ~ 2.8 MB pdf)
Department: Department of Chemical Engineering
Degree: Master of Science
Program: Chemical Engineering
Document Type: Thesis
Advisory Committee: Kreps, Saul I. (Committee chair)
Mantell, C. L. (Committee member)
Keeffe, George C. (Committee member)
Date: 1960
Keywords: Paraffins
Viscosity
Availability: Unrestricted
Abstract:

The absolute viscosity of the normal paraffins C5H12 to C20H42 was studied to determine a relationship more useful in predicting liquid viscosities than existing correlations such as the methods of Andrade, Souders, Thomas, and Doolittle.

It was found that a function of corresponding liquid states could be designed which related viscosity to the number of carbon atoms. This function, here called liquidity, is defined as the extent to which a substance exists as a liquid with respect to temperature. This function can be expressed mathematically as:

Lc = (t - tm)/(tc - tm) or Lb = (t-tm)/(tb-tm);

where:
Lc = liquidity based on the critical temperature
Lb = liquidit based on the normal boiling temperature
t = any temperature, °C
tb = normal boiling temperature, °C
tc = critical temperature, °C
tm = normal melting temperature, °C

Once the basis for liquidity is determined, the denominator in the above expressions remain constant, and the % liquidity becomes a straight line function of the temperature.

It was further found that a plot of Lc vs. number of carbon atoms for the n - paraffins resulted in curves of iso - viscosity which, when fitted to straight lines, could be used for calculation, extrapolation, or interpolation of viscosity data. Thus, a method was developed for the viscosity prediction of the n - paraffins above C4H10 to apply at any temperature within the normal liquid range. Deviations from the experimental values of viscosity to those resulting from the designed liquidity function are within ± 10 per cent for the majority, and less than ± 20 per cent for the extreme cases. This approach to viscosity prediction is valid with or without the availability of experimental data.


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