Minimum lean-TEG concentration

Lean TEG is used as a reflux to the contactor, and tire water dew point of the dehydrated gas depends on the concentration of tire lean TEG. With the increase in lean-TEG purity, tire equilibrium dew point of the dehydrated gas is reduced. The minimum TEG concentration required for a specified dehydration depends on the contactor temperature and equilibrium dew point. Achieving tire required lean-TEG concentration depends on the design of the regenerator. Normally, a 98.5 wt% lean-TEG concentration can be achieved if the regenerator reboiler is operated at 204°C. Generally, the following Figure 5.7 is used to establish the minimum lean-TEG concentration [3]. 

Figure 5.7 Minimum lean TEG concentration. (Courtesy Gas Processing Supplier Association.)...

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