Detailed Hydrocarbon Analysis of Naphtha Nexis GC-2030PONA2

Importance of Detailed Naphtha Hydrocarbon Analysis

Detailed hydrocarbon profiling of naphtha streams is essential for petrochemical industry applications, quality control, and process optimization. Accurate composition data informs blending strategies, regulatory compliance, and consistency in downstream processes.

Study Objectives and Overview

This work presents a standardized protocol for detailed hydrocarbon analysis (DHA) of naphtha using a Nexis GC-2030PONA2 gas chromatograph. The goal is to resolve and quantify C1–C10+ hydrocarbons, including structural isomers and aromatics, to support precise process monitoring and product specification.

Methodology and Used Instrumentation

The analysis uses a single SPL injector and a methyl silicone bonded-phase fused silica capillary column. Helium carrier gas transports vaporized samples through the column, where components separate by volatility and interaction with the stationary phase. An FID detects eluting peaks, which are identified by retention index matching against reference data and standard chromatograms. Concentrations are calculated by area normalization with response factors; species eluting after n-nonane are reported collectively as C10+.

• Gas chromatograph: Shimadzu Nexis GC-2030PONA2
• Injector: Single programmable split/splitless (SPL)
• Column: Methyl silicone bonded-phase capillary
• Detector: Flame ionization detector (FID)
• Carrier gas: Helium
• Software: Dragon DHA for PIONA reporting

Main Results and Discussion

Typical chromatograms exhibit baseline resolution of over 80 hydrocarbons, spanning light gases (methane, ethane) to heavier isomers and aromatics. The method demonstrates high repeatability and reliable quantification across the specified concentration range (≥100 ppm). Summation of late-eluting compounds simplifies reporting of higher-boiling fractions.

Benefits and Practical Applications

This approach provides robust separation of isomers, compliance with ASTM D5134, and efficient data processing. It is well suited for refinery quality assurance, feedstock evaluation in petrochemical plants, and environmental monitoring of hydrocarbon emissions.

Future Trends and Potential Applications

Emerging developments include coupling DHA with mass spectrometry to enhance compound identification, automation of sample preparation, and integration into real-time process control frameworks. Adaptation for renewable feedstocks and on-line monitoring systems promises broader industrial applicability.

Conclusion

The detailed hydrocarbon analysis method described offers comprehensive, repeatable quantification of naphtha constituents, aligning with industry standards and meeting the demands of modern analytical laboratories. Its streamlined workflow and reliable performance make it a valuable tool for quality control in refining and petrochemical operations.

References

• ASTM D5134 Standard Practice for PIONA Analysis of Hydrocarbon Gases and Light Hydrocarbon Liquids
• Dragon DHA Software, Envantage Inc. (registered trademark)
• Shimadzu Nexis GC-2030 Gas Chromatograph