#### Document Type

Thesis

#### Date of Award

Spring 5-31-1960

#### Degree Name

Master of Science in Chemical Engineering - (M.S.)

#### Department

Chemical Engineering

#### First Advisor

Saul I. Kreps

#### Second Advisor

C. L. Mantell

#### Third Advisor

George C. Keeffe

#### Abstract

The absolute viscosity of the normal paraffins C_{5}H_{12} to C_{20}H_{42} 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:

L_{c} = (t - t_{m})/(t_{c} - t_{m}) or L_{b} = (t-t_{m})/(t_{b}-t_{m});

where:

L_{c} = liquidity based on the critical temperature

L_{b} = liquidit based on the normal boiling temperature

t = any temperature, °C

t_{b} = normal boiling temperature, °C

t_{c} = critical temperature, °C

t_{m} = 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 L_{c} 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 C_{4}H_{10} 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.

#### Recommended Citation

Permutt, Gerald, "Absolute viscosity of the n-paraffin liquids" (1960). *Theses*. 1537.

https://digitalcommons.njit.edu/theses/1537