ASTM Petrochemical Method Chromatography Product Guide

Importance of the Topic

Accurate characterization of petrochemical streams is essential to ensure product quality compliance and process optimization. Standardized gas chromatographic methods enable reliable boiling range distributions, detailed hydrocarbon profiles, oxygenate quantitation, biodiesel analysis, natural gas composition and trace impurity detection. Integrating proven column chemistries with certified reference materials fosters reproducibility across laboratories.

Objectives and Overview of the Guide

This guide compiles Restek recommendations for selecting GC columns and reference standards aligned with ASTM and UOP test methods covering Simulated Distillation, Detailed Hydrocarbon Analysis, Finished Gasoline, Biodiesel, Natural Gas, Refinery Gas, Impurities and Sulfur determinations.

Methodology and Instrumentation

Gas chromatography is the core analytical technique. Key features include:

• Use of Siltek treated stainless steel columns for high thermal stability in high‐temperature distillation methods
• Long capillary columns with narrow internal diameters for high resolution in hydrocarbon profiling
• Micropacked and porous polymer columns for oxygenate separation
• Flame photometric detection for selective sulfur compound quantitation

Used Instrumentation

• Gas chromatographs capable of operating up to 735 °C column oven temperatures
• Hydrogen, helium or nitrogen carrier gas systems with precise flow control
• Thermal conductivity and flame ionization detectors
• Flame photometric detectors for sulfur analysis

Main Findings and Discussion

The guide organizes methods by application and suggests optimal column dimensions and stationary phases. For boiling range distribution methods (D2887 series, D7213, D6352, D7500, D7169, D7096) MXT‐1HT and Rtx‐2887 columns provide robust performance. Detailed hydrocarbon analysis methods (D5134, D6729, D6730, D6733) rely on Rtx‐DHA phases to achieve C4 to C10+ separation. Oxygenate and aromatic determinations in gasoline (D3606, D4815, D5580, D5501) employ mixed stationary phases in two‐column configurations. Biodiesel glycerin analysis (D6584) uses biodiesel‐specific stationary phases with retention gaps. Natural and refinery gas methods (D1945, D2163, UOP 539) combine molecular sieve and porous polymer columns. Impurity and sulfur methods (D2593, D2712, D6159, D5441, D6228, D5623) highlight specialized adsorbent and capillary columns for trace level detection.

Benefits and Practical Applications

Standardized column and standard selections reduce method development time, improve reproducibility and ensure compliance with regulatory specifications. Laboratories benefit from integrated solutions that streamline calibration and maintenance workflows, enhancing throughput in quality control, research and bulk petrochemical processing.

Future Trends and Possible Applications

Emerging trends include integration of mass spectrometric detection for enhanced compound identification, micro GC instruments for field analysis, and advanced column coatings to extend lifetime and reduce bleed at high temperatures. Automation and data analytics integration will further improve method robustness and throughput.

Conclusion

Restek integrated solutions support a broad range of petrochemical GC methods through recommended columns and reference standards. By following the guide, analysts can achieve reliable, reproducible results and maintain compliance with ASTM and UOP specifications across diverse hydrocarbon matrices.