ID (mm) | df(µm) | Temperature limits (°C) |
---|---|---|
0.32 | 0.10 | to 330/380 |
(proprietary liquid crystalline phase)
The stationary phase of this column is specially designed for separation of isomeric polynuclear aromatic hydrocarbons. Specifically, it provides fast analysis of EPA Method 610 PAH mixture. The stationary phase is cross-linked and chemically bonded, which dramatically lowers the bleed at elevated temperatures, making the column compatible with MS detector.
ID (mm) | df(µm) | Temperature limits (°C) |
---|---|---|
0.25 | 1.40 | 80 to 285 |
(Optimalized 5% phenyl methyl phase)
ID (mm) | df(µm) | Temperature limits (°C) |
---|---|---|
0.25 | 0.10 | -60 to 330/360 |
(divinyl benzene 4-vinylpyridine)
Restek chemists have developed a new process for the manufacturing of porous polymer PLOT columns. The process incorporates the particles to the walls of the tubing, so there is virtually no particle generation. Because of the particle adhering to the walls of the tubing, there is reproducible performance from column to column, including selectivity and flow.
ID (mm) | df(µm) | Temperature limits (°C) |
---|---|---|
0.32 | 10.0 | to 250 |
0.53 | 20.0 | to 250 |
(Aluminium oxid deactivated by Na2SO4)
The selectivity of the Rt™-Alumina PLOT column is measured by the retention indices for acetylene and propadiene. These two components are extremely sensitive for a change in selectivity.
For saturates, retention is determined mainly by the volatility of the compound, with less volatile compounds retained longer than more volatile compounds. For example, isoparaffins are less retained than less volatile normal paraffins of similar carbon number.
For unsaturates, retention is strongly influenced by polarity or degree of unsaturation. In general, hydrocarbons having a higher degree of unsaturation are more polar. This polarity comes from the presence of π electrons; the more π electrons present in a compound, the more polar it behaves and the more strongly it is retained.
Proper deactivation is critical to minimize reactivity of the aluminum oxide stationary phase and maximize column sensitivity. Quantitation can be done only if the column exhibits linear response, which results from good stationary phase inertness. Rt™-Alumina PLOT columns are specially deactivated and provide high inertness for unsaturates and saturates. In fact, Rt™-Alumina PLOT columns are almost four times more sensitive for unsaturates than other brands on the market.
Each Rt™-Alumina PLOT column is tested with a hydrocarbon test mix to ensure proper phase thickness and deactivation (see figure). Pentane is used to calculate k (capacity factor), which is a measure of phase thickness. The ratio of isobutane to acetylene retention is measured to ensure proper deactivation of the alumina oxide layer. The plates per meter value is calculated to evaluate column efficiency.
Restek’s Rt™-Alumina PLOT columns offer fast and reproducible hydrocarbon stream and purity analyses. The 0.32mm ID Rt™-Alumina PLOT column provides fast and efficient analysis of C1 to C5 hydrocarbons. The higher capacity of the 0.53mm ID Rt™-Alumina PLOT column makes it ideal for purity analysis of many common petrochemicals, such as 1,3-butadiene, ethylene, and propylene.
ID (mm) | df(µm) | Temperature limits (°C) |
---|---|---|
0.32 | 3.00 | to 200 |
0.53 | 6.00 | to 200 |
(100% divinylbenzene)
Restek chemists have developed a new process for the manufacturing of porous polymer PLOT columns. The process incorporates the particles to the walls of the tubing, so there is virtually no particle generation. Because of the particle adhering to the walls of the tubing, there is reproducible performance from column to column, including selectivity and flow.
ID (mm) | df(µm) | Temperature limits (°C) |
---|---|---|
0.32 | 10.0 | to 320 |
0.53 | 20.0 | to 320 |
(porous divinyl benzene homopolymer)
Restek chemists have developed a new process for the manufacturing of porous polymer PLOT columns. The process incorporates the particles to the walls of the tubing, so there is virtually no particle generation. Because of the particle adhering to the walls of the tubing, there is reproducible performance from column to column, including selectivity and flow.
ID (mm) | df(µm) | Temperature limits (°C) |
---|---|---|
0.32 | 10.0 | to 250°C |
0.53 | 20.0 | to 250°C |
(Molecular sieve 5A)
Rt™-Msieve 5A PLOT columns are designed for efficient separation of Ar/O2 and other permanent gases, including CH5, C2H6, and CO. Special coating and deactivation procedures ensure chromatographic efficiency and the integrity of the porous layer coating. The high surface area of the Rt™-Msieve is generated by the pore structure present in the molecular sieve. Only compounds that can enter the pores will be exposed to this surface and will be retained. Molecular sieves have very high retention, allowing separations of permanent gases at temperatures above ambient. Additionally, Restek’s unique immobilization process guarantees that the uniform particles remain adhered to the tubing - even after continuous valve-cycling.
The deactivation technology also allows the CO peak to elute as a sharp peak. This is in contrast with other suppliers where CO often tails badly and cannot be quantified below % levels.
ID (mm) | df(µm) | Temperature limits (°C) |
---|---|---|
0.32 | 30.0 | to 300 |
0.53 | 50.0 | to 300 |
(divinylbenzene ethylene glycol/dimethylacrylate)
Restek chemists have developed a new process for the manufacturing of porous polymer PLOT columns. The process incorporates the particles to the walls of the tubing, so there is virtually no particle generation. Because of the particle adhering to the walls of the tubing, there is reproducible performance from column to column, including selectivity and flow.
ID (mm) | df(µm) | Temperature limits (°C) |
---|---|---|
0.32 | 10.0 | to 190 |
0.53 | 20.0 | to 190 |
(1,2,3-tris[2-kyanoetoxy]propan)
Most gasolines contain aliphatic hydrocarbons up to n-dodecane (C12). To improve identification of the aromatics and oxygenates, it is desirable to elute benzene after C11 and toluene after C12. The extremely polar Rt™-TCEP stationary phase provides a retention index for benzene greater than 1100 and permits the separation of alcohols and aromatics from the aliphatic constituents in gasoline.
Rt™-TCEP columns have the same high polarity as TCEP packed columns (precolumns in ASTM Method D4815 for the analysis of petroleum oxygenates), with the efficiency of a capillary column. The result is a column that can separate a wide variety of compounds with an elution pattern unattainable using other high polarity siloxanes.
The Rt™-TCEP column incorporates a nonbonded stationary phase coated on a surface specialized for enhanced polymer stability and extended column lifetime. Solvent rinsing should be avoided. Conditioning is necessary only if the column is to be used at temperatures near the maximum operating temperature.
ID (mm) | df(µm) | Temperature limits (°C) |
---|---|---|
0.25 | 0.40 | 0 to 135 |