Analytical Instrumentation
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Illustration 2: The tests also showed a very high repeatability of micro distillation analysers for a typical gasoline sample. PAC’s micro distillation analysers, MicroDist and PMD110, have a very fast cycle time, and can measure sample to sample within 10 minutes.
Illustration 1: PAC measured five different gasoline samples at temperatures ranging from 25°C to 220°C. At every stage of the testing process, the results demonstrated excellent correlation between the online micro distillation analyser, MicroDist, to the laboratory distillation analyser, OptiDist. (R squared of 0.9999).
Test Details
During the testing period, five unique gasoline samples were run through each of the distillation analysers, demonstrating high levels of correlation between the two micro distillation analysers, MicroDist and PMD110, using the ASTM D7345 method, and the laboratory distillation analyser, OptiDist, which uses the ASTM D86 method.
Results
The test results demonstrated excellent correlation between ASTM D86 and ASTM D7345, as shown in the charts.
Conclusion
Analysers using both the ASTM D86 and ASTM D7345 methods have been shown to deliver reliable, highly correlated results. The best choice of analyser largely depends on the requirements of the refinery.
Laboratory distillation analysers using the D86 method, like OptiDist, are ideal for laboratory analysis when full compliance with all atmospheric distillation methods is required. The versatility of OptiDist makes it easy to adapt the instrument to many different applications. Micro distillation analysers like PMD110 and MicroDist are ideal for field analysis, especially for gasoline, diesel, and jet fuel applications. Now that ASTM specification for diesel (D975), jet fuel (D1655), and, most recently, gasoline (D4814), allow for analysis by alternate method D7345, the PMD110 and MicroDist can be used to release products to specification without the need for additional laboratory testing.
For additional information about monitoring the distillation of petroleum products and liquid fuels at atmospheric pressure, visit our website at
www.paclp.com.
Author Details Dan Airey & Thomas Herold, PAC LP • Email:
Daniel.Airey@
paclp.com • Email:
Thomas.Herold@paclp.com • Web:
www.paclp.com
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OCTOBER / NOVEMBER •
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