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Gas purifiers are necessary because they help in providing a clean gas stream, which can guarantee the quality of the gas chromatographic analysis and the reliability of the outcomes. Further, such gas purifiers minimize detector noise and prolong the life span of the column. Gas purifiers are like plans to protect the instrumentation and other analytical columns from several types of contaminants. Still, the gas purifiers will never be able to convert low purity gases into high purity gases. Because of this important factor, it is necessary to select the proper grade of gases with different purity levels for proper used in gas chromatographic applications.

Selection of Right Gas Purifier to Suit Your Applications

Numerous kinds of gas purifiers are available in the market. While some gas purifiers remove just one single specific contaminant, other styles remove multiple contaminants simultaneously from the gas stream. You have to think about several factors during the selection process of gas purifiers, taking into consideration your unique applications. These factors includes the potential contaminants within the gas stream, the limitations on flow and pressure, levels of gas purity required, desired convenience in replacement of spent gas traps, and space availability.

Common Traps Used in Gas Purifiers

Oxygen, hydrocarbon, carbon dioxide, and moisture traps will be the most common purifiers used in most the gas chromatography (GC) applications. Oxygen traps are usually packed with metal catalysts. Oxygen is considered as the most detrimental contaminating gas in every analytical columns. headspace sampler is with the capacity of producing irreversible oxidation damage, especially to polar stationary phases. Hydrocarbon traps are usually filled with activated charcoal, which can absorb organic compounds that are bigger than methane. Still, the molecular weight and size of the organic contaminants will have a definite influence on the capability of the hydrocarbon trap to an excellent extent but it may also reflect on trap efficiency somewhat.

Activated charcoal possesses a higher capacity to trap larger hydrocarbons that are greater than C4, in comparison to smaller hydrocarbons, which are lesser than C4. Moisture traps are often packed with unique molecular sieves. When subjected to extensive heating, the crystalline structures are forced to lose their hydration or water content. This opens a cavity which gets filled readily with any compound that can fit the cavity. Water fits perfectly into this cavity but this trap will also be able to remove gases like skin tightening and, sulfur dioxide, hydrogen chloride, and chlorine or other gases which have effective diameters lesser than water.

Process of Contaminants Affecting Gas Stream

If you want to know how the contaminants affect the gas stream, you will need to follow the road that the carrier gas takes to find yourself in the gas chromatograph. This path does apply for detector fuel gases also. The gases begin from a gas tank or a special gas generator. The gas travels through long lengths of tubes, pressure gauges, valves, and various other fittings. Each one of these areas is a potential culprit to introduce contaminants into the gas stream. This leads not merely in degrading the results of chromatography but also shortens the life of the column of CG.

Major contaminants like oxygen, hydrocarbons, and moisture are capable of wreaking havoc with the columns and detectors of CG. The packed and capillary columns will get degraded easily when they face oxygen or moisture, especially at high temperatures. These contaminants will also compromise detector performance. Since the detectors actually ‘see’ these contaminants, the effect is baseline noises, spikes, and drifts.

You should install gas purifiers in a vertical position as wall mounted types to avoid channeling. Channeling occurs once you install the gas purifier in a horizontal position. Gas purifiers can be found as compact panels having multiple purifiers or single panel which has multi-absorbent capabilities.

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