Presentation Profile
Total Nitrogen in LPG by Combustion and Chemiluminescence
Currently Scheduled: 1/18/2018 - 9:50 AM - 10:20 AM
Room: Room 372 D
Main Author
Aaron Mendez Ph.D. - Ayalytical Instruments and TSHR
- Arthur - TSHR
Abstract:
The quality specifications for hetero elements in crudes and products mention particularly and entirely sulfur, excluding nitrogen. All reasons of quality, pollution, corrosion, detrimental impact on the economy of catalyst conversion processes and the like, can also be attributed to nitrogen compounds. The N analysis is gaining attention because at normal concentrations N compounds compete with S in hydro desulfurization processes effecting process efficiencies.
Analytical methods for the quantitation of nitrogen are varied and all face some challenges because nitrogen compounds exhibit different chemical properties, other basic and many are amphoteric, posing a challenge on the calibration standard selection, on the experimental conditions and in method development. Combustion reduces all these species to a single NO that reacts with Ozone in a selective and fast chemiluminescence reaction giving limits of detection in the order of ppb. We have tested several calibration standards with different N compounds and results prove that the method is selective, sensitive with a high degree of repeatability and reproducibility. The LPG automatic inlet system can inject samples up to 100 loops, producing a linear, high dynamic range calibrations utilizing a single compressed gas calibration matrix.
