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High Temperature Simulated Distillation (High Temp SIMDIS) is one of the most frequently used techniques to determine the boiling point range of whole crude oil. Accuracy of data for this analysis is pivotal in determining crude value and for decision-making when refining. In accepted High temp SIMDIS methods, one of the critical points of attention for analyzing whole crudes with light ends is the quenching effect of the solvent – usually CS2 – on the FID signal in the early portion of the chromatogram. This effect is well documented and understood, and is known to cause a lower analytical precision for that specific part of the boiling point data for whole crude when analyzed by High Temp SIMDIS.
To obtain better precision results, standardization committees are adopting or developing new methods that use a data merge of a separate DHA (Detailed Hydrocarbon) analysis with the high temperature SIMDIS analysis. IP601 and ASTM D7169 are examples describing this process. Data from DHA analysis up to C9 are merged by specific software with the >C9 data from High Temp SIMDIS analysis to obtain a single boiling point range determination for the whole crude oil with better precision. A case study is presented based on 15+ crude samples from different sources, comparing DHA/ High Temp SIMDIS Merge data with traditional High Temp SIMDIS data.
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