When analyzing hydrocarbon impurities in propylene by ASTM D2712, using an Rt-Alumina BOND Na2SO4 PLOT column instead of a packed column setup provides the greatest degree of resolution in the least amount of time. (PDF - 0kB)
Restek’s Rtx-Volatile Amine column is specifically designed for GC analysis of volatile amines in challenging matrices. The stable bonded phase is highly retentive and selective for volatile amines to ensure good chromatographic separations and peak shapes. In addition, the column is very robust and able to withstand repeated exposure to harsh sample matrices, such as water.
Volatile amines, such as monomethylamine, diethylamine, and triethylamine, are widely used in the petrochemical industry, but are prone to poor peak shape and difficult to analyze. Low levels of volatile amines can now be accurately reported using new Rtx®-Volatile Amine columns due to high column inertness.
Carrier gas changes for SimDist methods, such as ASTM Method D7213, can be easily implemented in your daily process. Using MXT®-1HT SimDist columns and EZGC® method translation software, helium-based SimDist methods can be easily translated to alternative carrier gases while maintaining ASTM Method D7213 requirements.
Accurate analysis of biodiesel FAME in jet fuel is critical for ensuring that contamination levels do not exceed allowable limits. Method IP 585 is commonly used for this analysis and here we perform the method using a Stabilwax column and GC-MS in SIM mode. Method calibration curve criteria were met and good recoveries of the total FAME content in jet fuel were obtained.
When testing for impurities in ethylene using ASTM D6159-97, the combination of an Rt-Alumina BOND column coupled to an Rtx-1 column provides the best resolution of the most common hydrocarbon contaminants. (PDF - 0kB)
Analysis of Trace Hydrocarbon Impurities in 1,3-Butadiene Using Optimized Rt®-Alumina BOND/MAPD PLOT Columns
Impurity analysis of 1,3-butadiene on an Rt®-Alumina BOND/MAPD column results in good separation of both light polar impurities (methyl acetylene, propadiene) and 4-vinylcyclohexene, a heavier contaminant that often requires testing on a second column.
We challenged our Rtx-Biodiesel column with analysis for glycerin in biodiesel according to method ASTM D-6584-00. Excellent linearity was established for glycerin, triolein, monolein, and diolein, with r2 values exceeding the method criteria for all compounds. Mono-, di-, and triglycerides resolved well from other compounds in B100 biodiesel oil. Column performance was strong at high temperatures, with low bleed even at 380°C. An Alumaseal connector and guard column were used to extend column life.
In process GC analyses, this material offers unique selectivity for the difficult-to-separate saturated and unsaturated C4 hydrocarbons, eluting cis-2-butene before
Analyze ppb Level Sulfur Compounds Using an Rt®-XLSulfur Micropacked GC Column or an Rtx®-1 Thick Film Capillary
Analyze Trace Polar Hydrocarbons More Accurately and Reliably With New Alumina BOND/MAPD PLOT Columns!
Rt- and MXT-Alumina BOND/MAPD PLOT columns outperform other MAPD columns for trace analysis of methyl acetylene, acetylene, propadiene, and other polar hydrocarbons. The new deactivation results in more predictable responses, increased capacity, and higher temperature stability. (PDF - 0kB)
Two methods are used to quantify individual alcohols and ethers in gasoline: a single column OFID method (e.g., ASTM Method D5599-94) and dual-column ASTM Method D4815-93. Restek offers columns, calibration mixtures, and inert capillary tubing for both approaches. 4-page note. (PDF - 0kB)
Restek is your ideal partner for integrated petrochemical solutions, and our ASTM method product guide will help you quickly pick the right GC columns and reference standards for SimDist, DHA, finished gasoline, and other common petroleum analyses.
The current helium shortage has severely impacted gas chromatographers who are finding that helium has become significantly more expensive and is not always available when needed. This article explores the benefits and considerations of replacing helium with hydrogen carrier gas.
Glycerin is a notoriously difficult challenge in GC, particularly at the levels involved in biodiesel oil analysis, but an Rtx-Biodiesel column provides a symmetric peak that makes quantification easier and more reliable. The column performs well at elevated temperatures: peaks for glycerin and glycerides exhibit minimal tailing, and bleed is low at 370°C, as specified in European method DIN EN14105.
This flyer includes data demonstrating the performance of recommended GC columns for the analysis of total glycerin, fatty acid methyl esters (FAMEs), and residual methanol in biodiesel. Features a comparison of metal and fused silica columns. (PDF - 0kB)
Rtx-DHA columns are ideal for Detailed Hydrocarbon Analaysis (DHA) methods and easily meet or exceed both ASTM D6730-01 and Canadian General Standards Board CAN/CGSB 3.0 No. 14.3-99 requirements. Every Rtx-DHA column is tested for retention, efficiency, stationary phase selectivity, and bleed—guaranteeing reproducible column-to-column performance. (PDF - 0kB)
Virtually unlimited in supply—but only available from Restek—new DiatoSorb-W diatomaceous earth offers a reliable alternative for packed column users. After years of dealing with supply shortages and inconsistent product quality, analysts who depend on diatomaceous earth columns now have a reliable new source. Restek now uses DiatoSorb-W as the exclusive replacement to the diatomaceous earth that was previously used in our standard and Silcoport W GC packed columns lines. All DiatoSorb-W material undergoes rigorous quality testing to ensure high purity and dependable performance. DiatoSorb-W material is available in acid-washed (WAW), non-acid washed (WNAW), and high-performance (WHP) varieties.
Using metal columns to analyze glycerides in biodiesel offer significant performance advantages compared to fused silica columns, as shown in this evaluation.
New metal MXT PLOT columns offer greater stability than conventional PLOT columns, making them a better choice for process GC analyzer applications. New bonding techniques result in highly reproducible flow characteristics, improved layer stability, and excellent separation efficiencies.
As biodiesel fuel continues to stimulate interest worldwide as an energy source, several gas chromatographic methods have been developed to determine the quality of B100 fuel. Here we show excellent peak symmetry, resolution, and reproducibility for determining the fatty acid methyl ester (FAME) and linolenic acid methyl ester content in B100 biodiesel fuel, using European standard method EN 14103 on a Stabilwax® fused silica GC column.
Rtx®-DHA columns are highly stable and can be run with helium or hydrogen under accelerated conditions. Restek has developed a new DHA method using Rtx®-DHA columns with hydrogen that can double refinery sample throughput.
Fingerprinting Crude Oils and Tarballs using Biomarkers and Comprehensive Two-Dimensional Gas Chromatography
Comprehensive two-dimensional gas chromatography time-of-flight mass spectrometry (GCxGC-TOFMS) was used to analyze petroleum biomarkers creating unique fingerprints of crude oil samples and tarballs collected after the Deepwater Horizon oil spill.
Ultra-low bleed and exceptional inertness assure complete separation of sulfur compounds (hydrogen sulfide, carbonyl sulfide, dimethyl sulfide, mercaptans) on our new column, with excellent peak shapes and reliable quantification at ppbv levels. A Sulfinert® treated sampling/transfer system assures no adsorption losses of these very reactive compounds.
Comprehensive 2D GC, also known as GCxGC, is a powerful technique with a great deal of potential for improving separations of complex petroleum and petrochemical samples that contain hundreds—or even thousands—of components. While GCxGC is still considered emerging technology and is used primarily in research and development labs, it has undergone significant growth in the past few years.
The high temperatures required for biodiesel analysis by gas chromatography present a considerable challenge to analytical columns. Fused silica columns, even those rated for high-temperature tolerance, breakdown relatively quickly. Restek’s new MXT®-Biodiesel columns are more stable up to 430°C and offer excellent chromatography for glycerides. These columns are available in two configurations: factory-coupled to a 0.53mm retention gap, or with a built-in, leak-proof Integra-Gap retention gap.
Improve Trace Analysis of Acetylene, Propadiene, and Methyl Acetylene Impurities With Higher Sample Capacity Alumina MAPD Columns
Rt-Alumina BOND/MAPD columns offer higher capacity than other MAPD columns and are ideal for analyzing acetylene, propadiene, and methyl acetylene in petroleum gases. Greater capacity improves data accuracy due to better peak symmetry and a wide linear range.
Restek has optimized molecular sieve 5A and 13X columns for trace analyses, including difficult analytes like oxygen and carbon monoxide. Example chromatograms in this 2-page note show sharp, symmetric peaks for permanent gases. (PDF - 0kB)
Rt-Alumina BOND/CFC columns provide high retention and high selectivity for volatile halogenated hydrocarbons, without the activity that is usually observed with alumina adsorbents. Chlorofluorocarbon analysis, in particular, can benefit from this new technology.
Restek's new D3606 column set outperforms TCEP columns for gasoline testing. The D3606 set has higher thermal stability and reliably resolves benzene from ethanol, resulting in more accurate quantitation.
Relative to helium as the GC carrier gas, hydrogen from a gas generator reduces gas costs, cuts analysis time by 50%, and reduces temperatures needed for eluting analytes which increases column lifetime. Parker ChromGas® hydrogen generators are safe, convenient, reliable, and easy to use.
Sulfur compounds in fuel streams can damage equipment and reduce BTU values. Sulfinert® sample cylinders are significantly more inert than stainless steel cylinders and assure sample integrity during collection, transportation, and storage.
This 2-column set for modified ASTM Method D3606-10 completely resolves benzene from ethanol in reformulated fuels containing ethanol. The aromatic compounds also are fully separated and can easily be quantified using sec-butanol as an internal standard. (PDF - 0kB)
Restek's PLOT column family is the benchmark for performance! Our innovative bonding process minimizes particle release, reducing column blockage and protecting instrument parts. More consistent flow means stable retention times in Deans and related flow switching techniques.And outstanding peak symmetry improves impurity analysis for gases, solvents, and hydrocarbons. (PDF - 0kB)
Rt-XLSulfur packed and micropacked columns combine a unique, efficient porous polymer packing material and true inertness toward active analytes, to ensure excellent and reliable results in trace-level analyses of hydrogen sulfide, sulfur dioxide, and other lightweight sulfur compounds. (PDF - 0kB)
Rt®-XLSulfur Packed GC Column for Analysis of Low-Level Sulfur Compounds in C1-C6 Hydrocarbon Streams
Rt®-XLSulfur columns resolve hydrocarbons from sulfur compounds in hydrocarbon process streams and exhibit excellent inertness with low ppbv levels of sulfurs.
Rtx-2887 / MXT-2887: Restek's Capillary GC Columns for Simulated Distillation of Petroleum Fractions
ASTM D2887-01a is used to monitor petroleum products, excluding gasoline, with final boiling points of less than 538°C. Metal MXT-2887 columns and fused silica Rtx-2887 columns offer lower bleed, faster analysis times, and longer column lifetimes. (PDF - 0kB)
A Restek PLOT column can be your best solution for difficult separations of gaseous analytes. Rt-Msieve 5A PLOT columns offer fast, efficient separation of argon/oxygen, hydrogen/helium, and other permanent gases, including permanent gases in refinery or natural gas. You can make difficult separations without subambient temperatures, e.g.: separate oxygen from argon to baseline in approximately 4 minutes.
ShinCarbon ST Micropacked GC Columns: Above-Ambient Analyses of Permanent Gases and Light Hydrocarbons
A ShinCarbon ST micropacked column will separate hydrogen, oxygen, nitrogen, carbon dioxide, carbon monoxide, and methane in 10 minutes, without cryogenic cooling. This 2-page note also shows separations of light hydrocarbon/permanent gas mixtures, natural gas components, and fluorocarbons. (PDF - 0kB)
Restek offers an expansive line of Sulfinert-treated sample cylinders, valves, and accessories. (PDF - 0kB)
Chromatograms, technical tips, and products developed specifically for petrochemical testing. Details recommendations for simulated distillation, PLOT column applications, DHA, D3606, biodiesel, permanent gases and hydrocarbons. (PDF - 0kB)
Refinery and natural gas samples often contain trace amounts of sulfur- and mercury-containing compounds, which can interfere with reactions, poison catalysts in petrochemical processes, and damage equipment. Because these compounds quickly react with stainless steel surfaces, accurate determination of these compounds is impossible when samples are collected and stored in untreated sample cylinders. Restek's Siltek® and Sulfinert® passivation techniques bond an inert layer into the surface of stainless steel, preventing active compounds from reacting with or adsorbing to the steel.
Recovery of a 17ppbv test standard of hydrogen sulfide exceeded 85% after 54 hours in a Sulfinert®-treated cylinder; recoveries of methyl mercaptan, ethyl mercaptan, carbonyl sulfide, and dimethyl disulfide exceeded 90%. A Sulfinert®-treated sampling/transfer system can assure accurate sulfur content data for natural gas, beverage-grade carbon dioxide, or other samples.
New MXT®-1HT SimDist GC columns outperform competitors, allowing more productive D6352 analyses. Here we demonstrate lower bleed levels and higher efficiency, improving resolution and assuring more samples can be run within method specifications.
ASTM Method D2887 now allows for alternate carrier gases, so hydrogen or nitrogen can replace helium carrier gas for simulated distillation. Here, we show that with an MXT-1HT SimDist column and Restek’s EZGC online method translator existing methods using helium can be easily converted to either hydrogen or nitrogen carrier gas. Because retention times are preserved with proper method translation, there are minimal changes to peak identification tables which significantly simplifies method validation.
Most analysts still use traditional packed columns for light hydrocarbon analysis, but many adsorbents are also available in micropacked column formats. Micropacked columns are a good alternative when both efficiency and sample loadability are desired.
Virtually Particle-Free Rt-Silica BOND Columns; Reliable PLOT Column Performance with Less Time Lost for Maintenance
Rt-Silica BOND PLOT columns from Restek are ideal for light hydrocarbon, permanent gas, and CFC analyses. We individually QC test every column with sensitive C4 probes to ensure consistent column-to-column selectivity. Our proprietary manufacturing process practically eliminates particle release, resulting in highly stable retention times. (PDF - 0kB)
Virtually Particle-Free Rt®-Silica BOND Columns Provide Reliable PLOT Column Performance With Less Time Lost for Maintenance
Get PLOT column performance and minimize maintenance by using Rt®-Silica BOND PLOT columns from Restek. These columns offer the retention and capacity needed for the analysis of light hydrocarbons, sulfur gases, halocarbons, and permanent gases, while providing nearly particle-free operation which results in less down time for maintenance and more stable retention times. Every column is QC tested with sensitive C4 probes to ensure consistent column-to-column selectivity.