Restek Corporation, 1-800-356-1688 or 1-814-353-1300 www.restek.com Petrochemical Applications Molecular Sieve 5A and 13X Packed GC Columns for Permanent Gas Separations Molecular sieves, synthetic forms of Zeolite packing, have been used since the 1950s for separating light gases (oxygen, nitrogen, methane, and carbon monoxide) and inert gases (helium, argon, neon, krypton, and xenon), yet there have been few changes or improvements in their basic composition or performance. Restek has designed the two most common molecular sieves—5A and 13X, as high-performance pack- ings that feature batch-to-batch inertness and consistency. These packings are used in a wide range of packed and PLOT column analyses. Molecular sieve 5A and 13X packings differ in pore size and composition, causing differences in retention and selectivity for many gases. The 5A packing provides greater retention, which improves the separation of argon, oxygen, and nitrogen, and is a better choice for analyzing the trace impurities in inert gases typ- ically used in the semiconductor industry. The 13X packing often is preferred for analysis of carbon monoxide, particularly at trace concentrations, because lower retention results in sharper chromato- graphic peaks and improved detection limits. Molecular Sieve 5A or 13X Packing in Silcosteel® Treated Tubing Exhibits Excellent Chromatography for Permanent Gas Analysis Figure 1 compares a gas mixture analyzed using a 1-meter high-performance Molecular Sieve 5A column and a 2-meter high-performance Molecular Sieve 13X column. Notice the excellent peak symmetry for carbon monoxide on each column, indicating that the packing and column tubing are extremely inert. Combining high-quality molecular sieves with Silcosteel® treated* tubing produces a packed column optimized for trace analysis of the difficult components oxygen and carbon monoxide. Figure 1 Permanent gases on Molecular Sieve 5A and Molecular Sieve 13X packed columns. Chromatography Products Molecular Sieve 5A: excellent resolution of oxygen, nitrogen, methane, and carbon monoxide. 1. oxygen 2. nitrogen 3. methane 4. carbon monoxide 10μL helium, 5–10% each component Oven temp.: 50°C Inj./det. temp.: 150°C/200°C Carrier gas: hydrogen Flow: 30mL/min., helium Detector: TCD 1 2 3 4 min.0 2 4 Molecular Sieve 13X: rapid analysis and excellent peak symmetry for carbon monoxide. GC_PC00166 1 2 3 4 min.0 2 4 Molecular Sieve 5A 80/100 mesh 1m x 1 /8" x 2mm ID (cat.# 80440) Molecular Sieve 13X 80/100 mesh 2m x 1 /8" x 2mm (ID) (cat.# 80439) *Silcosteel ® treatment is a proprietary surface treatment for passivating steel and stainless steel. U.S. Patent 6,511,760.
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Restek Corporation, 1-800-356-1688 or 1-814-353-1300 www.restek.com
Petrochemical Applications
Molecular Sieve 5A and 13XPacked GC Columns for Permanent Gas Separations
Molecular sieves, synthetic forms of Zeolite packing, have been used since the 1950s for separating lightgases (oxygen, nitrogen, methane, and carbon monoxide) and inert gases (helium, argon, neon, krypton,and xenon), yet there have been few changes or improvements in their basic composition or performance.Restek has designed the two most common molecular sieves—5A and 13X, as high-performance pack-ings that feature batch-to-batch inertness and consistency. These packings are used in a wide range ofpacked and PLOT column analyses.
Molecular sieve 5A and 13X packings differ in pore size and composition, causing differences in retentionand selectivity for many gases. The 5A packing provides greater retention, which improves the separationof argon, oxygen, and nitrogen, and is a better choice for analyzing the trace impurities in inert gases typ-ically used in the semiconductor industry. The 13X packing often is preferred for analysis of carbonmonoxide, particularly at trace concentrations, because lower retention results in sharper chromato-graphic peaks and improved detection limits.
Molecular Sieve 5A or 13X Packing in Silcosteel® Treated Tubing Exhibits Excellent Chromatographyfor Permanent Gas AnalysisFigure 1 compares a gas mixture analyzed using a 1-meter high-performance Molecular Sieve 5A columnand a 2-meter high-performance Molecular Sieve 13X column. Notice the excellent peak symmetry forcarbon monoxide on each column, indicating that the packing and column tubing are extremely inert.Combining high-quality molecular sieves with Silcosteel® treated* tubing produces a packed columnoptimized for trace analysis of the difficult components oxygen and carbon monoxide.
Figure 1 Permanent gases on Molecular Sieve 5A and Molecular Sieve 13X packedcolumns.
Chromatography Products
Molecular Sieve 5A: excellent resolution of oxygen, nitrogen,
PATENTS & TRADEMARKSRestek® patents and trademarks are the property of Restek Corporation. (See www.restek.com/Patents-Trademarks for full list.) Other trademarks appearing in Restek® literature or on its website are the property of their respective owners. The Restek® registered trademarks used here are registered in the United States and may also be registered in other countries.
Micropacked Columns• Increased efficiency over traditional packed columns.• Higher capacity than PLOT columns.• Made from inert, flexible Silcosteel® treated stainless steel tubing.• Silcosteel® treated, braided wire end plug keeps packing intact, even under intense pressure surges
during valve switching.
Mesh ID OD Temp. Range 1-Meter 2-MeterMolesieve 5A 80/100 0.75mm 0.95mm up to 300°C 19002 19003Molesieve 5A 80/100 1.00mm 1/16" up to 300°C 19000 19001Molesieve 13X 80/100 0.75mm 0.95mm up to 350°C 19006 19007Molesieve 13X 80/100 1.00mm 1/16" up to 350°C 19004 19005
ColumnC rations
GeneralConfigurationSuffix -800
Agilent 5880, 5890,5987, 6890:Suffix -810
Varian 3700,Vista Series,FID:Suffix -820
PE 900-3920Sigma 1,2,3:Suffix -830
83/4"
PE Auto System8300, 8400,8700 (Not On-Column):Suffix -840
6 1/2"
See our general catalog forcustom configurations
Note: Initial 2" of column willbe empty, to accommodate aneedle. For a completely filledcolumn add suffix -901.
Quality Testing Ensures ReproducibilityEach lot of Zeolite packing is purified to remove metals and other trace contaminants that can adsorbtrace gases, such as carbon monoxide. Then, every batch is carefully classified to precise mesh ranges,ensuring lot-to-lot reproducibility. Our thermal conditioning process is critical for establishing the rela-tive retention of methane/carbon monoxide, and for producing excellent peak symmetry for active com-pounds like carbon monoxide. As a result, each lot of molecular sieve is precisely produced, conditioned,and quality assurance tested for reproducible efficiency, column back pressure, peak symmetry, and rela-tive retention time, using a permanent gas performance mixture.