GC Solution for the Sampling and Analysis of Liquefied Gases
Sep 19 2018 Read 326 Times
The analysis of impurities and contaminants in liquefied gases is an analytical challenge. Current test methods are labor intensive and present a safety risk due to the required evaporation of large volumes of liquefied gas. Da Vinci developed the Liquefied Gas Injector: an alternative and fast gas chromatographic method which features a direct injection of the liquefied gases and eliminates the need for sample evaporation.
The Liquefied Gas Injector (LGI) method has been standardised in ASTM D7756 and EN 16423 for the analysis of oily residues in liquefied petroleum gases by gas chromatography. The LPG specification standard D1835-16 lists the LGI method ASTM D7756 for the residue analysis.
Adapting the hardware setup allows to extend the analysis of oily residues in LPG to a wider application range.
Direct Injection Technique
The direct injection approach of the Liquefied Gas Injector includes the proven fuel direct injection technique used by the automotive industry to inject fuel into the automotive engine combustion chamber. The LGI (as shown in Figure 2) is connected to a standard GC injector needle, which is inserted into a GC injection port. Solenoid activation transfers the pressurised liquid sample directly onto the GC inlet.
To allow a representative sample injection a Pressure Station (as displayed in Figure 3) is used to maintain the liquid sample in a liquid phase under constant pressure during the injection. The sample cylinder is installed using quick connectors. For liquid samples the Pressure Station adds high pressure Nitrogen to the sample cylinder and controls the outlet pressure and flow.
Optionally the Pressure Station can also be configured for gas samples by including a vaporizer to control the sample evaporation after injection. The waste sample is vented to a central waste system to ensure laboratory safety.
Wide Application Range
Several case studies demonstrate an excellent and fast performance of the LGI. The case studies are described in the various application notes. Download the application notes to learn more on the various applications of the LGI:
- Oily residues and light contaminants in LPG (ASTM D7756, EN 16423)
- Hydrocarbon composition of LPG (ASTM D 2163, ISO 7941)
- Sulfur compounds in liquefied petroleum gases
- Elemental Sulfur in LPG’s
- Desulfurization additives in LPG: DIPA, MEA & DEA
- Inhibitors, additives and Dimers in Butadiene: ACN, ρTBC, Butadiene Dimer
- Nitrogen, carbon dioxide, hydrogen sulfide and C1-C36+ hydrocarbons in unstabilised gas condensate
Since its introduction in 2010 the LGI has been successfully used by a global installed base of leading oil refineries. Contact Da Vinci Laboratory Solutions for more information.
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