Sharper Peak Shape and Better Efficiency through Uniform Glass Infusion™ Coating Technology

Significance of the Topic

Simulated distillation (SimDist) is a cornerstone technique in petroleum analysis, underpinning quality control and process optimization in refining and petrochemical industries. High-temperature performance, peak shape fidelity, and column robustness directly impact the accuracy of boiling point distributions from light hydrocarbons through heavy fractions, making advanced column technologies critical for reliable SimDist methods.

Objectives and Study Overview

This work evaluates a new metal GC column, Zebron ZB-1XT SimDist, featuring proprietary Glass Infusion™ coating and Engineered Self Cross-linking (ESC™) stationary phase. The aim is to compare its performance against non-infused columns and industry benchmarks for key metrics: peak symmetry, efficiency, lifetime, and reproducibility across ASTM methods (D2887, D6352, D7169).

Methodology and Instrumentation

Analyses employed both split and on-column injections with hydrogen or helium carrier gases under constant flow or pressure. Typical conditions:

• Injection: split 100:1 at 250 °C or on-column at 33–53 °C
• Carrier gas: hydrogen at 1.93 mL/min or helium at 7–34 mL/min
• Oven programs: isothermal 130 °C or ramps from 30–450 °C at 9–10 °C/min
• Detector: FID at 325–450 °C
• Columns: 5 m × 0.53 mm ID, film thickness 0.09–0.15 µm (with optional integrated guard)

The Glass Infusion™ process deposits a uniform glass layer on the internal metal surface, followed by bonding of the ESC™ polymer to ensure thermal stability and minimal active sites.

Main Results and Discussion

Zebron ZB-1XT columns exhibited:

• Up to 70% higher column efficiency compared to non-infused equivalents
• Excellent peak symmetry for early and late eluting hydrocarbons (e.g., C9–C12 asymmetry ≈ 1.0)
• Reduced sample adsorption and tailing, especially for polar or high-boiling analytes
• Consistent performance across individual columns, owing to per-column testing rather than batch testing
• Extended lifetime at temperatures up to 450 °C, with stable resolution of C50/C52 over prolonged sequences

Chromatograms of ASTM D7169 distillation fractions (C7–C100+) confirmed sharper peaks, improved signal-to-noise, and reliable elution of high-boiling compounds up to C120,
avoiding column fouling and analysis drift.

Benefits and Practical Applications

The uniform glass coating and robust polymer phase translate into:

• Enhanced reproducibility for regulatory and research laboratories
• Reduced retesting and downtime due to column variability
• Improved resolution in complex petroleum fractions, aiding fractionation and product yield optimization
• Lower maintenance costs by minimizing carryover and system contamination

This technology is well suited for petroleum fractions, vacuum distillates, gasoline and crude oil characterization, and any SimDist method requiring high-temperature endurance.

Future Trends and Opportunities

Upcoming directions include further extending the boiling point range beyond C120, integration of real-time monitoring sensors, and coupling with mass spectrometry for detailed compositional analysis. Advances in nanocoatings and hybrid materials may yield even greater inertness and thermal resistance, while automated column testing protocols will enhance reproducibility across global laboratories.

Conclusion

Zebron ZB-1XT SimDist columns, leveraging Glass Infusion™ and ESC™, deliver superior efficiency, peak shape, and thermal durability for simulated distillation. Individual testing ensures reliable reproducibility, making these columns a compelling choice for laboratories seeking robust, high-temperature performance in petroleum analysis.