Wasson Chromatography Corner 28

Significance of the Topic

The detailed characterization of hydrocarbon mixtures and rigorous sample integrity are cornerstones of modern petrochemical analysis. Methods such as Detailed Hydrocarbon Analysis (DHA) per ASTM D6730 and rapid variants thereof enable refiners and producers to optimize processing units, meet regulatory requirements, and improve profitability. Automated cleaning of sample cylinders further enhances data reliability by minimizing contamination and operator error.

Objectives and Study Overview

This newsletter issue outlines two primary developments from Wasson-ECE Instrumentation: a standard and accelerated detailed hydrocarbon analysis workflow, and a fully automated steam-based sample cylinder cleaning system. Additionally, practical guidance on carrier gas selection for gas chromatography is provided, along with updates on new application notes and upcoming industry events.

Methodology and Instrumentation Used

Detailed hydrocarbon analysis follows ASTM D6730, resolving dozens of individual hydrocarbons over a 175-minute GC run. To serve producers requiring rapid decision-making, Wasson-ECE configured a fast DHA method reducing analysis time to 30 minutes by adopting a specialized column and hydrogen carrier gas. Both methods run on the same gas chromatograph, switching between standard and fast protocols without hardware changes.

Automated Sample Cylinder Cleaner: The steam cleaner system accommodates twelve 300 cc cylinders in a vertical manifold. A touchscreen interface allows users to program pressurize-evacuate cycles that flush residual hydrocarbons and moisture, ensuring consistent decontamination without manual handling.

Main Results and Discussion

The integration of hydrogen carrier gas in fast DHA preserved resolution comparable to the standard helium-based method while cutting run times by >80%. This capability permits real-time adjustments in refinery operations. The steam-based cleaning module demonstrated uniform removal of residues, reducing inter-sample variability and labor requirements. Users reported improved reproducibility and a significant decrease in cylinder turnaround time.

Benefits and Practical Applications

• Enhanced Productivity: Fast DHA supports same-shift process optimization and minimizes throughput bottlenecks.
• Cost Efficiency: Dual-mode GC operation eliminates the need for separate instruments.
• Regulatory Compliance: Standard DHA meets federal and ASTM mandates for fuel and crude analyses.
• Improved Data Quality: Automated cylinder cleaning reduces cross-contamination and manual error.

Future Trends and Potential Applications

Emerging carrier gas generators and smart valves may further streamline GC workflows by providing on-demand hydrogen or nitrogen. Coupling rapid DHA with real-time data analytics and process control systems will drive adaptive refining strategies. Automated sample preparation technologies are poised to integrate robotics and LIMS connectivity, advancing laboratory efficiency and traceability.

Conclusion

Wasson-ECE's combined offering of detailed and fast hydrocarbon analysis methods, along with an automated sample cylinder cleaner, addresses the dual needs of high-accuracy profiling and operational agility in petroleum laboratories. These solutions deliver both regulatory compliance and actionable data for process optimization, setting the stage for smarter, faster refinery management.

Reference

ASTM International. ASTM D6730 – Standard Test Method for Determination of Individual Components in Spark Ignition Engine Fuels by Detailed Hydrocarbon Analysis.