DVLS Liquefied Gas Injector

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One of our innovations is the Liquefied Gas Injector: a fast, safe and accurate solution for the Sampling & Analysis of impurities in Liquefied Gases. The technique is standardized in the ASTM D7756 and EN 16423 methods for the analysis of residue in LPG. Watch the video for an explanation of the system configuration followed by a demonstration of the Liquefied Gas Injector.

Sampling and analysis of liquefied gases

The setup of the Liquefied Gas Injector (LGI) solution consists of an Agilent gas chromatograph (GC) on which the Liquefied Gas Injector 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.

[LGI Applications]

Applications

The DVLS Liquefied Gas Injector offers laboratories a safe, reliable and efficient GC standard for the following applications:

Oily residues and light contaminants in LPG (ASTM D7756, EN 16423);
Amines in LPG;
Benzene and Toluene in LPG (ASTM D7756);
Elemental sulfur in LPG;
Nitrogen, carbon dioxide, hydrogen sulfide and hydrocarbons in (un)stabilized gas condensate;
Composition & impurities analysis in butadiene, crude C4 & raffinate (ASTM D2593, D4424, D2426);
Oxygenate traces in liquid hydrocarbon matrices (ASTM D7423, D7754);
Hydrocarbon composition of LPG (ASTM D 2163, ISO 7941).

[LGI Options]

Options

Pressure Station:

To allow a representative sample injection a Pressure Station is used to keep the sample in a liquid phase 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.

[LGI Benefits]

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 gas chromatography.

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