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For all five cases, the first unit operation of the gas treatment process is dehydration. The typical dehydration process used in natural gas processing is glycol dehydration, with the flowsheet shown in Figure 2.3. As mentioned previously, the goal of the glycol dehydration process is to remove thermodynamically bound water from the gas to permissible levels. Triethylene glycol (TEG) is the most commonly used solvent in industry for water removal. This process contains two loops, i.e. the contactor loop (where wet gas is contacted with TEG to remove water) and the regenerator loop (where water is removed from TEG in order to recycle the TEG back to the contactor).

Figure 2.3 Glycol dehydration process.