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Usingmetal columns to analyze glycerides in biodiesel offer significant performance advantages
compared to fused silica columns, as shown in this evaluation.
Eliminate Column Breakage in High Temperature Biodiesel Analysis
Refinery and natural gas samples often contain trace amounts of sulfur- andmercury-containing
compounds, which can interferewith 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.
Stable Sulfur &Mercury Sampling in Refineries
When testing for impurities in ethylene using ASTMD6159-97, the combination of an Rt -Alumina
BOND column coupled to an Rtx -1 column provides the best resolution of themost common
hydrocarbon contaminants. (PDF - 175kB)
Analysis of Impurities in Ethylene by ASTMD6159-97
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 newMXT -Biodiesel columns aremore 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.
High Temp. Stability Problem Solved with NewMetal Columns
As biodiesel fuel continues to stimulate interest worldwide as an energy source, several gas
chromatographicmethods have been developed to determine the quality of B100 fuel. Herewe show
excellent peak symmetry, resolution, and reproducibility for determining the fatty acidmethyl ester
(FAME) and linolenic acidmethyl ester content in B100 biodiesel fuel, using European standardmethod
EN 14103 on a Stabilwax fused silicaGC column.
Fast, Accurate FAMEs Analyses of Biodiesel Fuel
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 Europeanmethod DIN EN14105.
Biodiesel Analysis by European Methodology
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 canmake difficult
separations without subambient temperatures, e.g.: separate oxygen from argon to baseline in
approximately 4minutes.
Separate Argon fromOxygen Above Ambient Temperatures
We challenged our Rtx -Biodiesel column with analysis for glycerin in biodiesel according tomethod
ASTMD-6584-00. Excellent linearitywas established for glycerin, triolein, monolein, and diolein, with r
values exceeding themethod criteria for all compounds. Mono-, di-, and triglycerides resolved well
from other compounds in B100 biodiesel oil. Column performancewas strong at high temperatures,
with low bleed even at 380°C. An Alumaseal™ connector and guard column were used to extend
column life.
Analyze Biodiesel Oil for Glycerin
We evaluated our 100meter x 0.25mm ID x 0.5df PONA column and equivalent columns from four
other vendors, following ASTMD-6730methodology (hydrogen carrier gas). Data and chromatograms
presented here show that only the Restek PONA column performed tomethod specifications admirably.
Column efficiency exceeded specification.
HowGood is Your PONA Column?
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.
Sulfinert -Treated Sample Cylinders
GC Analysis of Total Reduced Sulfurs at ppbv Levels
Petroleum&Petrochemical
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