packedcolumns
Applications
note
RestekCorporation • (800)356-1688 • (814)353-1300 •
#59165
packedcolumns
Rt-XLSulfur
™
PackedGCColumn forAnalysisof Low-Level Sulfur
Compounds inC1-C6HydrocarbonStreams
The analysis of sulfur compounds inC1-C6hydrocarbon streams
bygas chromatography (GC) is an important application in the
petrochemical field.Thepresenceof sulfur compounds in
petroleumproducts canaffect the longevityandperformanceof
catalystsused inhydrocarbonprocessing.As requirements for
sulfurdetectionbecomemore stringent, the importanceofgood
chromatographic separationof thehydrocarbons from the sulfur
compounds and the inertnessof theanalytical columns increases.
Detectorsused for sulfurdeterminationgenerallyare specific
(e.g., sulfurchemiluminescencedetection)andhelpeliminate
positive response fromchromatographic interferences.Unfortu-
nately,whenhigh levels of hydrocarbons elute through the
detector simultaneouslywith sulfur compounds, thesignal for
sulfur isquenchedandareacountsaredecreased.For a successful
analysis, theanalyticalcolumnmust resolve thehydrocarbons from
the sulfurs listed inFigure1.Apacked,micropacked, orPLOT
columncanbeused toachieve this requirement.
Figure1
TheRt-XLSulfur
™
micropacked column separates
hydrocarbons from sulfur compounds.
Figure2
TheRt-XLSulfur
™
column is sensitive enough for
50ppbv sulfur compounds.
1
2
3
4,5
6
1. hydrogen sulfide
2. carbonyl sulfide
3. methyl mercaptan
1mx0.75mm IDRt-XLSulfur
™
column (cat.#19806)
Sample conc.:
50ppb;
Oven temp.:
60°C to230°C@15°C/min.;
Carriergas:
helium;
Flowrate:
9mL/min.;
Detection:
SCD
5
10
Sulfurs
1. hydrogen sulfide
2. carbonyl sulfide
3. methyl mercaptan
4. ethyl mercaptan
5. dimethyl sulfide
6. dimethyl disulfide
AB
C
D
E
F
G
H
I
1
2
3
4/5
6
2
4
6
8
10
Hydrocarbons
A. methane
B. ethane
C. propylene
D. propane
E. isobutane
F. butane
G. isopentane
H. pentane
I. hexane
This is the second generation of packing material for the
analysis of sulfur compounds. The first packing material,
in the Rt-Sulfur
™
column, had inertness characteristics for
low ppmv levels of sulfur compounds. Now, with the second
generation, the Rt-XLSulfur
™
column, it is possible to
achieve low ppbv detection of sulfur compounds.
min.
min.
4. ethyl mercaptan
5. dimethyl sulfide
6. dimethyl disulfide
1mx0.75mm IDRt-XLSulfur
™
column (cat.#19806)
Oven temp.:
60°C to230°C@15°C/min.;
Carrier gas:
helium;
Flowrate:
9mL/min.;
Detection:
FID/SCD
