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2004 vol. 3

Above-Ambient GSC Analysis of Permanent

Gases and Light Hydrocarbons

Using ShinCarbon ST Micropacked Columns

by Barry Burger, Petroleum Chemist, and Gary Stidsen, GC Columns Marketing Manager

•Rapid separations, including CO/CO

, without cryogenics.

•Minimal baseline rise with GC/GSC detectors.

• Fast stabilization - ready to use in 30 minutes.

ShinCarbon ST, a high surface area carbon

molecular sieve (~1500 m

/g), is the GSC medi-

um of choice for gases and highly volatile com-

pounds. A 2-meter, 1mm ID ShinCarbon ST

micropacked column separates the permanent

gases in about 10 minutes, without cryogenic

cooling (Figure 1), and separates permanent gas

/ light hydrocarbon mixtures quickly and effec-

tively (Figure 1). Additional applications for

ShinCarbon ST include natural gas (Figure 2), sul-

fur dioxide, and Freon

fluorocarbons (Figure 3).*

ShinCarbon ST is highly stable. A 330ºC upper

temperature limit ensures minimal bleed and

baseline rise during temperature programming

and makes the material compatible with most

detection systems used for gas analysis, includ-

ing TCDs and HIDs. ShinCarbon ST columns are

conditioned in an oxygen/moisture free environ-

ment to minimize stabilization time (less than 30

minutes) when installing a new column.

ShinCarbon ST columns eliminate the tempera-

ture and bleed problems that can complicate

analyses of permanent gases, light hydrocar-

bons, and other highly volatile compounds, and

provide excellent resolution and analysis times

for these applications. Micropacked columns

and 2-meter, 2mm ID packed columns are avail-

able from stock; custom columns are available

on request.

ShinCarbon ST 100/120 Micropacked Columns

(Silcosteel®-treated stainless steel)

1-Meter

2-Meter

1.0mm

19809

$175

19808

$199

0.95mm

0.75mm

19810

$175

—

ShinCarbon ST 80/100 Packed Columns

(Silcosteel®-treated stainless steel)

2-Meter**

2.0mm

80486-

$249

Installation Kits for Micropacked

Columns

for 0.75mm ID col.

for 1mm ID col.

For valve applications 21062

$105

21065

$30

For split applications 21063

$15

—

For all Agilent GCs

21064

$15

—

For direct injections

—

21066

$45

Refer to our catalog

or website for

Scott gas standards for

permanent gases and

light hydrocarbons

5µL permanent gases mix

approx. 5 mol. percent each

Figure 1

Rapidly separate permanent gases or permanent gas / light hydrocarbon mixtures, without cryogenic

cooling, on a ShinCarbon ST micropacked column.

1. hydrogen

2. oxygen

3. nitrogen

4. carbon monoxide

5. methane

6. carbon dioxide

GC_PC00666

Conditions for both chromatograms:

ShinCarbon ST 100/120 mesh

2 meter x 1mm ID micropacked

(cat.# 19808)

Inj. temp.: 100°C

Carrier gas: helium

Flow rate: 10mL/min.

Oven temp.:

40°C (hold 3 min.)

to 250° @ 8°/min.

(hold 10 min.)

Det.

HID @ 200°C

1. oxygen

2. nitrogen

3. carbon monoxide

4. methane

5. carbon dioxide

6. acetylene

7. ethylene

8. ethane

GC_PC00665

ShinCarbon ST 100/120 mesh (cat.# 19809)

1 meter x 1mm ID micropacked

Sample:

C1-C6 hydrocarbons, 0.5-8.0% each

Inj. temp.:

200°C

Det.:

FID/250°C

Carrier gas:

helium (constant flow)

Linear velocity: 10mL/min.

Oven temp.:

125°C to 250°C @ 16°C/min.

1. methane

2. ethane

3. propane

4. isobutane

5. n-butane

6. isopentane

7. n-pentane

8. hexanes

Figure 2

Monitor components of natural gas on a

Shincarbon ST micropacked column.

*For a chromatogram of a sulfur dioxide analysis, visit our

website or request publication 59519A.

** Refer to our catalog or website for available configurations.

ShinCarbon ST 100/120 mesh (cat.# 19809)

1 meter x 1mm ID micropacked

Sample:

5µL, ~1-3% each

Inj. temp.:

200°C

Det.:

FID/250°C

Carrier gas:

helium

Linear velocity:

10mL/min.

Oven temp.:

125°C to 320°C @ 16°C/min.

1. Freon

134a/22

2. Freon

3. Freon

133a

4. Freon

114

GC_PC00673

GC_PC00672

Figure 3

Fluorocarbons separated in 11 minutes on a

ShinCarbon ST column.

5µL permanent gases

C1+C2 hydrocarbons, 1% each