PAC’s Analytical Controls began shipping its CNS SIMDIS (simulated distillation) Analyzer for Crude Oil this month. Like the low-temperature CNS SIMDIS, which was introduced in 2011, the high-temperature model measures boiling point distribution of carbon, sulfur and nitrogen in one run, utilizing flame ionization and chemiluminescence detection. “We realized analyzing crude on the front end of the process in the refinery gives refiners a big benefit. We don’t have to run a full crude assay first; we just do the analysis right away on the raw product,” said PAC Chromatography Product Manager Rob de Jong. “There are different methods out there that will do the final product, but can’t do crude oils and deliver the amount of specific information required.”

Typically, crude assays are analyzed using physical distillation. “The crude assay physical distillation process takes up to three days,” said Mr. de Jong. “The whole exercise is costly and laborious and delivers less granular data.” The new system also works with heavier components, such as distillates and lubricants, with final boiling points of up to 700°C. It also analyzes components with initial boiling points down to 151°C, or lower with an optional Detailed Hydrocarbon Analysis Front End attachment, which can prevent loss of the carbon profile in fractions with low boiling points. The initial system is suited for components with final boiling points of less than 538°C, such as jet and diesel fuels.

ASTM plans to issue a standard for boiling range distribution of hydrocarbons and sulfur of petroleum distillates using chemiluminescence detection this year. Mr. de Jong expects that a standard for nitrogen will also be issued.