The setup of the Liquefied Gas Injector (LGI) solution consists of an Agilent gas chromatograph (GC) on which the LGI and its controller are installed. The Pressure Station is used for safe and accurate sample introduction of LPG.
The direct injection approach of the Liquefied Gas Injector (LGI) is a safe alternative technique to a liquid sampling valve or manual evaporation. The LGI uses a standard GC injector needle, which is inserted into a GC large volume on-column injection system. Solenoid activation transfers the pressurized sample through the needle directly on-column. A sliding device moves the needle downwards for the injection and upwards for purging.
The LGI directly injects the liquefied gas into the GC inlet to ensure the safety and the full transfer of the impurities onto the GC column. The chromatographic analysis after the sample introduction is based on boiling point separation of the impurities. The result is reported in mg/kg. The analysis of the impurities in LPG is completed within 20 minutes.
Benefits
Safe injection of liquefied gases: The direct injection approach of the LGI eliminates the need for evaporating large volumes of liquefied gas.
High repeatability: The direct liquid injection results in an excellent repeatability and it avoids discrimination of high boiling components as there is no transfer to an inlet.
Proven technology: Since its introduction in 2010 the LGI has been successfully used by a global installed base of leading oil refineries.
Wide application range: The LGI is a dedicated solution to the analysis of heavy components in light matrices such as LPG.
Accurate performance: Several case studies demonstrate an excellent performance. Detection limits of <0.1 mg/kg for individual impurities in liquefied gases are easily achieved.
Standardized method: The LGI is one of the innovations of Da Vinci and has been standardized as ASTM D7756 and EN 16423 for the analysis of oily residue in liquefied petroleum gases by GC.
