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Protect LNG Sample Integrity and Prevent Sulfur Loss with Sulfinert® Sample Cylinders
By Silvia Martinez, Innovations Chemist, and Jan Pijpelink, Petrochemical Market Development Manager
Content previously published in Petro Industry News
Sulfur compounds in fuel streams can damage equipment and reduce BTU values, but accurate quantification is challenging due to adsorption in sample collection devices. Sulfinert® sample cylinders are significantly more inert than stainless steel cylinders and assure sample integrity during collection and storage.
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Faster DHA Analyses Using Helium or Hydrogen
 By Barry Burger, Jan Pijpelink, Gary Stidsen, and Jaap de Zeeuw* Restek Corporation, 110 Benner Circle, Bellefonte, PA, US *Restek Corporation, Weerhaan 9, Middelburg, The Netherlands
Accurate information about the concentrations of individual components in gasolines is critical for evaluating raw materials and controlling refinery processes. A high-resolution GC method for detailed hydrocarbon analysis (DHA) of gasolines is outlined in American Society of Testing and Materials (ASTM) Method D6730-01. ASTM D6730-01 is specific for the analysis of hydrocarbon components, plus oxygenated additives such as methanol, ethanol, tert-butanol, methyl tert-butyl ether (MTBE), and tert-amyl methyl ether (TAME) in spark-ignition engine fuels.
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Tighten Control of Distillation Processes with the New MXT®-1HT Sim Dist Column |
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Tighten Control of Distillation Processes with the New MXT®-1HT Sim Dist Column
By Barry Burger, Petroleum Chemist and Jan Pijpelink, Petrochemical Market Development Manager
Content previously published in Petro Industry News
High temperature crude oil simulated distillation using ASTM methods D6352 and ASTM D7500 presents many challenges to refineries and contract laboratories for the determination of petroleum distillates in the boiling range of 174°C to 720°C. Both the column construction and the polydimethylsiloxane polymer must be robust enough to withstand the high method temperatures without significant degradation. In addition, columns must yield a C50/C52 resolution value between 2 and 4, exhibit acceptable peak symmetry, and reliably produce accurate boiling point data. Accurate determination of the boiling range distribution of medium and heavy fractions using GC simulated distillation provides critical information regarding the composition of crude oil and other products related to refinery processes. While fused silica columns can be used, they are not the best option anymore for high temperature simulated distillation applications. Metal MXT®-1HT Sim Dist columns are a much better alternative. These new columns are more stable at 430°C than fused silica columns and easily meet all method criteria, even under accelerated conditions.
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Tighten Control of Distillation Processes with the New MXT®-1HT Sim Dist Column |
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Tighten Control of Distillation Processes with the New MXT®-1HT Sim Dist Column
By Barry Burger, Petroleum Chemist and Jan Pijpelink, Petrochemical Market Development Manager
Content previously published in Petro Industry News
High temperature crude oil simulated distillation using ASTM methods D6352 and ASTM D7500 presents many challenges to refineries and contract laboratories for the determination of petroleum distillates in the boiling range of 174°C to 720°C. Both the column construction and the polydimethylsiloxane polymer must be robust enough to withstand the high method temperatures without significant degradation. In addition, columns must yield a C50/C52 resolution value between 2 and 4, exhibit acceptable peak symmetry, and reliably produce accurate boiling point data. Accurate determination of the boiling range distribution of medium and heavy fractions using GC simulated distillation provides critical information regarding the composition of crude oil and other products related to refinery processes. While fused silica columns can be used, they are not the best option anymore for high temperature simulated distillation applications. Metal MXT®-1HT Sim Dist columns are a much better alternative. These new columns are more stable at 430°C than fused silica columns and easily meet all method criteria, even under accelerated conditions.
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Accurately Quantify Methanol and Ethanol in E85 Biofuel by D5501 with New Rtx®-DHA-150 Column
By Barry Burger, Petroleum Innovations Chemist, Jaap de Zeeuw, International GC Specialist, and Jan Pijpelink, Petrochemical Market Development Manager
Content previously published in Petro Industry News
Ethanol and methanol levels in biofuels must be accurately determined as they impact fuel performance and influence sales price. Since fuel ethanol must be denatured with gasoline to render it nonpotable prior to transport, analysis is complicated by the presence of gasoline hydrocarbons. Testing is usually done according to ASTM Method D5501, which recommends either a 100m or a 150m column. This method currently targets the determination of ethanol at 93-97% and methanol at 0.1-0.6%, based on mass percent in product; however, discussions have been initiated to expand the range to 20-99%. The main challenge in ASTM D5501 is getting clean elution of both ethanol and methanol, without the coelution of components from the gasoline denaturant. Coelution of methanol and isobutane is particularly problematic and may require time-consuming cryogenic conditions.
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