•
10
•
2005vol. 2
High-pressure sample cylinders are commonlyused for collectingand storing
refinery and natural gas samples containing trace amounts of sulfur com-
pounds.Thesehighlyactive compoundsdegradevery rapidly in stainless steel
sample cylinders,making accuratedeterminationof sulfur compounds virtu-
ally impossible. Restek’s exclusive Sulfinert® surface treatment eliminates the
reactivity of high-pressure sample cylinders and allows collection and stable
storage of sulfur compounds, even at ppb levels. Figure 1 shows the recovery
of 17ppbv hydrogen sulfide, carbonyl sulfide, methyl mercaptan, ethyl mer-
captan, anddimethyl disulfide after 60 hours of storage in a Sulfinert® treat-
ed sample cylinder. The data show that these active compounds were unaf-
fectedby long-term storage in the Sulfinert® treated cylinder.
In addition to Sulfinert® treated cylinders, we also offer Sulfinert® treated
valves, tubing, and sample loops to ensure the entire sample pathway is inert.
Custom treatment is available for awide range of items.
ImproveStorageStability forSulfurCompounds
UsingSulfinert®TreatedSampleCylinders
By Neil Mosesman, AirMonitoring Product MarketingManager
• Eliminate sample-surface reactions in sample cylinders, collect and storeactive compounds.
• Obtainaccuratedata for active sulfur compounds at ppb levels.
• Many treated system components available from stock.
Figure1
Active sulfur compoundsare
stable inSulfinert® treated samplecylinders.
■
Sulfinert
®
cylinder 3
●
Sulfinert
®
cylinder 2
▲
Sulfinert
®
cylinder 1
MethylMercaptan
120
100
80
0
0
10
20
30
40
50
60
●
▲
▲
■
■
time (hours)
recovery (%)
Carbonyl Sulfide
120
100
80
0
0
10
20
30
40
50
60
●
●
▲
▲
■
■
time (hours)
recovery (%)
HydrogenSulfide
120
100
80
0
10
20
30
40
50
60
●
●
▲
▲
■
time (hours)
recovery (%)
0
EthylMercaptan
120
100
80
0
0
10
20
30
40
50
60
▲
▲
■
time (hours)
recovery (%)
■
DimethylDisulfide
120
100
80
0
0
10
20
30
40
50
60
●
■
time (hours)
recovery (%)
▲
■
●
●
●
●
●
●
●
●
■
▲
●
for
more
info
Please request ApplicationsNote#59164B formore details
about storing sulfur compounds in Sulfinert
®
treated cylinders.
Sulfinert®-TreatedSampleCylinders
• Stable storageof lowconcentrationsof sulfur compounds.
• D.O.T. rated to1800psi at room temperature.
• 316 stainless steel,
1
/
4
" femaleNPT threads onboth ends.
Size
qty.
cat.#
price
75cc
ea.
24130
$200
150cc
ea.
24131
$225
300cc
ea.
24132
$230
500cc
ea.
24133
$255
1000cc
ea.
24134
$425
2250cc
ea.
21394
$820
Sulfinert®-TreatedSampleCylinderValvesandRuptureDiscs
• All “wetted”valve parts are Sulfinert®-treated.
• Maximumpressure rating, 5000psi.
Description
qty.
cat.#
price
1
/
4
" NPT Exit, Kel-F
®
StemTip
ea.
24127
$175
1
/
4
" Compression Exit, Kel-F
®
StemTip
ea.
24128
$175
1
/
4
" FemaleNPTOutlet (built-in rupture disc)
ea.
21395
$420
Sulfinert®-TreatedGasSampleLoops
• Ideal for samples containing low concentrations of sulfur compounds.
• Sizes from5µL to5cc.;
1
/
16
" fittings, for“WType”valves.
Size
qty.
cat.#
price
5µL
ea.
22840
$115
10µL
ea.
22841
$115
20µL
ea.
22842
$115
25µL
ea.
22843
$115
50µL
ea.
22844
$115
100µL
ea.
22845
$115
250µL
ea.
22846
$115
500µL
ea.
22847
$115
1cc
ea.
22848
$115
2cc
ea.
22849
$115
5cc
ea.
22850
$115
17ppbv each compound
