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Analytical Instrumentation
Safe GC Solution for the Sampling & Analysis of Liquefied Gases The sampling and analysis of impurities and contaminants in liquefied gases is a challenge. To eliminate the need for evaporation of the liquefied gas and to overcome the discrimination and adsorption effects Da Vinci Laboratory Solutions has developed the Liquefied Gas Injector ASTM D7756. This gas chromatographic (GC) method features a safe injection of the liquefied gas directly onto the GC column and a representative sampling through a pressure station. The direct injection approach of the Liquefied Gas Injector (LGI) includes the proven fuel direct injection technique used by the automotive industry to inject fuel into the automotive engine combustion chamber.
The LGI is connected to a standard GC injector needle, which is inserted into a GC large volume on-column injection system. Solenoid activation transfers the pressurised sample through the needle directly on-column. A sliding device moves the needle downwards for the injection and upwards for purging. Since its introduction in 2010 the LGI has been successfully used by a global installed base of leading oil refineries. 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 vapouriser to control the sample evaporation after injection. The waste sample is vented to a central waste system to ensure laboratory safety.
The DVLS Liquefied Gas Injector offers laboratories a proven GC standard for the following applications: Oily residues and light contaminants in LPG (ASTM D7756, EN 16423), hydrocarbon composition of LPG (ASTM D 2163, ISO 7941), sulphur compounds in liquefied petroleum gases, desulphurisation additives in LPG: DIPA, MEA & DEA, inhibitors, additives and Dimers in Butadiene: ACN, ρTBC, Butadiene Dimer, and nitrogen, carbon dioxide, hydrogen sulphide and hydrocarbons in unstabilised gas condensate. Several case studies demonstrate an excellent and fast performance of the LGI. The case studies are described in the various application notes. One of the application notes describes the use of the LGI-GC technique for the analysis of sulphur compounds in liquefied Propane and Butane samples and in a liquid Pentane sample. Using a FPD detector the limits of quantification (LOQs) range from 0.18 to 0.27 mg sulfur/kg and the limits of detection (LODs) from 0.05 to 0.08 mg sulphur/kg respectively. This demonstrates that the LGI-GC technique combined with a sulphur specific detector offers a powerful tool for sulphur control of liquefied petroleum gas samples and liquid pentane samples.
True Workflow-Oriented Software for Simulated Distillation
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After the pre-announcement made in December, PAC is excited to announce the launch of a next generation software suite for GC SIMDIS Analyzers that truly refocuses all operator efforts on workflow. PAC SIMDIS Software interfaces universally to all major Chromatography Data Systems in the market to produce accurate results; fast and in the format required.
Designed to be a real workhorse, PAC SIMDIS Software features a vast array of smart drag-and-drop operations, zoom functions, filters and onscreen-links to allow relevant information production through a bare minimum of mouse clicks and saving operator-time, without any compromise to output or quality. Flexible editable templates allow for both calculus and reporting for different test methods and products. This means that data from the same standardised analytical method can be handled and reported differently, depending on the needs for that particular sample.
PAC SIMDIS Software is extremely intuitive, simple and easy to use, so it does not require a highly-trained operator. For laboratories requiring full flexibility, customisable user profiles are included. “The new SIMDIS software is far easier, intuitive, and more flexible” says Rob de Jong, PAC’s Product Manager for Gas Chromatography and Elemental Analysis. “With this next generation software, it is easier for the end-user to read and learn, it is very clear to get result with less keystrokes” according to De Jong. The software can be set up in different languages, e.g. Chinese or Spanish to accommodate non-English users.
Data audit trail lists actions performed on sample and connected blank and calibration files for perfect data traceability. Built-in quality control reporting and customizable reference- and calibration samples further add to quality assurance of the newly launched software.
As can be expected all relevant methods are supported, such as D2887, D7213, D7500, D7169 (with or w/o DHA Merge), IP480, EN ISO 3924, IP406, ASTM D5307, ASTM D6352, EN 15199-1/2/3, DIN 51.435, IP 507, IP 545 and an array of specific correlations, such as D86, D1160, D6417, NOACK acc. DIN 51.581-2 and Flashpoint acc. ASTM D7215.
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How to Inject a Representative Amount of Liquids & Gases into a GC?
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Petroleum Testing Instrumentation ASTM International Member Flash Point • Tribology Viscosity • Penetration
New Automatic PMCC Flash Point Analyzer for ASTM D93
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To allow a representative sample injection of a liquid or gaseous hydrocarbon stream such as LPG or Propane Da Vinci Laboratory Solutions developed the DVLS Pressure Station. Next to the sample injection the station keeps the pressure at a constant level by adding high pressure Nitrogen to the sample cylinder and controlling the outlet pressure and flow. For gas samples a vapouriser is used to avoid condensation and to control the temperature and pressure in the sample loop. The sample cylinder is installed on the front side of the pressure station using the quick connectors. The waste sample is vented to a central waste system or to a waste line that leads the vapor directly outside the building to ensure the lab safety. This technology has been proven in several applications at sites of leading oil refineries that require a representative sample injection, such as Propane, LPG, Butadiene and Pentane. Select from the following flexible configuration options to fully meet your requirements: A configuration including a restrictor dedicated to the injection of liquid hydrocarbon samples, a model configured with a vapouriser to enable the injection of pressurised gases, a configuration with a vapouriser & restrictor for the injection of liquid & pressurised gas samples, a configuration including a back pressure regulator to control the pressure, various brands of quick connectors such as Swagelok, Walther and Staubli to enable the use of different cylinder sizes. The Pressure Station can be used standalone or combined with the DVLS Liquefied Gas Injector: a GC solution that is originally developed for the analysis of oily residue in LPG and has been approved as ASTM D7756/ EN 16423. The LGI solution consists of an injector, a pressure station, a controller box and a GC. The injector is configured on top of the GC inlet and consists of a high pressure injection valve connected to an injection needle, which allows a direct injection. The Pressure Station is installed next to the GC and ensures that the Injector is filled with the sample in liquid phase. The Controller box drives the injection cycling. The DVLS Liquefied Gas Injector combined with the Pressure Station offers laboratories a safe and proven GC standard for various applications: Oily residues and light contaminants in LPG (ASTM D7756, EN 16423), Hydrocarbon composition of LPG (ASTM D 2163, ISO 7941), Sulphur compounds in liquefied petroleum gases, Desulphurisation additives in LPG: DIPA, MEA & DEA, Inhibitors, additives and Dimers in Butadiene: ACN, TBC, Butadiene Dimer, Nitrogen, carbon dioxide, hydrogen sulfide and hydrocarbons in unstabilised gas condensate.
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ANNUAL BUYERS GUIDE 2017 •
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