Energy & Fuels 1992,6, 870
870
Additions and Correc t ions H. P. Rlanningsen,' B. Bjlarndal, A. B. Hansen, and W. B. Pedersen: Wax Precipitation from North Sea Crude Oils. 1. Crystallization and Dissolution Temperatures, and Newtonian and Non-Newtonian Flow Properties 1991, 5,895-908.
The flow activation energies, E,, of some pure hydrocarbons, reported in Table IX, are not correct. They should be multiplied by In 10, i.e., 2.303. Besides, a few more data from the references cited in the paper have been included in the regression in order to arrive a t the flow activation energies given in the corrected version of Table IX below. The new figures are thus slightly different from the old figures multiplied by In 10. Table IX. Activation Energies of Newtonian Flow for Some P u r e Hydrocarbons. compd n-C7 n-Clo n-Clz n-Clr n-Clzd n-Cud toluene m-xylene
temp interval, OC 18-73 20-101 20-152 20-152 80-152 96-175 -20 to 110 0-140
E,,
kJmol-l 8.09 10.57 11.96 13.60 18.56 20.76 9.02 8.75
RSD,b % 0.32 0.61 0.90 1.8 1.8 3.0 0.81 0.66
RZC 0.9999 0.9999 0.9996 0.9994 0.9994 0.9983 0.9999 0.9999
ref 57 56 56 56 56 56 57 57
Calculated using viscosity-temperature data from the specified reference. * Relative standard error in the viscosity estimate. Correlation coefficientsquared. d Viscosities measured at 3 bar pressure; the other viscosities were measured at atmospheric pressure.
0887-0624/92/2506-0870$03.00/00 1992 American Chemical Society
