Conversion of heavy oil distillation data
Conversion of heavy oil distillation data from ASTM D-1160 TO ASTM D-5236
Abstract
The ASTM D-5236 method was proven to be the closest to true boiling point (TBP) of heavy oil
distillation data. That is why 60 heavy oils have been characterized for their distillation
charactersistics by ASTM D-5236 and ASTM D-1160 in the Research laboratory of LUKOIL
Neftochim Burgas and an attempt was made to find an accurate method to convert ASTM D-
۱۱۶۰ to ASTM D-5236. Six approaches were investigated to convert the heavy oil distillation
data from ASTM D-1160 to ASTM D-5236, such as the simple comparison of ASTM D-1160
and ASTM D-5236, the method of Edmister-Okamoto with original coefficients, as well as the
one with modified coefficients, Daubert, artificial neural networks and LNB methods. It was
found that the LNB method converts the heavy oil distillation data ASTM D-1160 to ASTM D-
۵۲۳۶ with the least error.
Application of a method developed at Lukoil Neftochim Bourgas (LNB) to convert
ASTM D-1160 to ASTM D-5236
Based on the data in Tables 1 and 2 and application of linear regression in the LNB Research
laboratory, following equations were established:
𝐷۵۲۳۶(۵%) = ۱۲۳,۸۱۹ + ۰,۶۴۷۲ ∗ (𝐷۱۱۶۰(۵%)) (۳۶)
𝐷۵۲۳۶(۱۰%) = ۷۶,۲۹۲ + ۰,۷۸۳۴ ∗ (𝐷۱۱۶۰(۱۰%)) (۳۷)
𝐷۵۲۳۶(۲۰%) = ۱۴,۷۵۱ + ۰,۹۵۰۷ ∗ (𝐷۱۱۶۰(۲۰%)) (۳۸)
𝐷۵۲۳۶(۳۰%) = −۰,۲۴۵۹ + ۰,۹۹۶۶ ∗ (𝐷۱۱۶۰(۳۰%)) (۳۹)
𝐷۵۲۳۶(۴۰%) = ۳۵,۹۵۹ + ۰,۹۲۷۲ ∗ (𝐷۱۱۶۰(۴۰%)) (۴۰)
𝐷۵۲۳۶(۵۰%) = −۰,۲۳۰۲ + ۱,۰۰۵۹ ∗ (𝐷۱۱۶۰(۵۰%)) (۴۱)
𝐷۵۲۳۶(۶۰%) = −۵,۱۷۶۰۵ + ۱,۰۱۵۶۵ ∗ (𝐷۱۱۶۰(۶۰%)) (۴۲)
𝐷۵۲۳۶(۷۰%) = −۱۱,۰۷۹۱ + ۱,۰۳۸۱۱ ∗ (𝐷۱۱۶۰(۷۰%)) (۴۳)
𝐷۵۲۳۶(۸۰%) = −۱۳,۹۰۲۳ + ۱,۰۵۰۸۶ ∗ (𝐷۱۱۶۰(۸۰%)) (۴۴)
Agreement between measured and estimated by equations 36-44 is depicted in Figure 5. It is evident from these
data that the LNB method achieves the lowest AAD (5.9°C) and almost the highest squared correlation coefficient
(R2 = 0.9893) among all studied in this work methods.
Table 1- Comparison of the accuracy of the investigated methods to convert ASTM D-1160 distillation data to ASTM D-5236
As can be seen from Table 1, the LNB method converts the heavy oil distillation data ASTM D-1160 to ASTM D-5236 with the least error exemplified by the lowest absolute average deviation (AAD) and the lowest standard deviation (SD).