Gas Purifiers, Dryers and Filters

Gas purifiers, dryers and filters are used to purify gases in a process stream. They are used to reduce or eliminate point-of-use impurities in gases such as helium, hydrogen, methane, nitrogen, and carbon dioxide. A gas purifier can remove moisture, hydrocarbons, oxygen and other impurities that can decrease yields or form oxides and hazes. Gas impurities can also cause distribution leaks, improper purging, and system breaches. Some gas purifiers, gas dryers and gas filters use a multiple bed format and special sorbents. Other gas purification products use adsorptive materials to capture and retain hydrocarbons and halocarbons. For applications with a single contaminant, high-capacity contaminant traps are a cost-effective solution. Suppliers of gas purifiers, gas dryers and gas filters can assist potential customers with product selection.

Gas fittings are used to connect gas purifiers, gas dryers and gas filters to gas lines. In general, better systems contain fewer fittings since each connection in a gas delivery system provides the potential for leaks. A manifold system features two compression fittings and an O-ring gas fitting for each cartridge. A contaminant trap has at least eight fittings before the gas supply reaches the gas chromatograph (GC). Typically, gas purifiers, gas dryers and gas filters are equipped to provide early warning signals when a gas stream has become contaminated. Gas purifiers, gas dryers and gas filters with automated valves allow for the ability to isolate or bypass the purifier if an abnormal amount of contamination is encountered.

There are many different types of gas purifiers, gas dryers and gas filters. Gas purifier types include helium and nitrogen purifiers, carbon dioxide gas purifiers, and devices for liquid carbon dioxide purification. A gas autoclave is a pressurized device that allows solutions such as liquid carbon dioxide to be heated to temperatures above the boiling point of water. A gas dryer is designed to remove water vapor from compressed natural gas. A gas filter is designed to remove contaminants with relatively large particle sizes.

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  Liquid entrainment in a gas stream can be a disturbance in many industrial processes. In natural-gas processing, higher-order hydrocarbons, water or impurities have to be separated from the main...
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