About handbook and write notesNatural gas dehydration is normally performed by absorption in triethylene glycol. Regeneration bytraditional distillation achieves about 1 weight % water in regenerated glycol. Use of stripping gas withor without an extra column, Coldfinger, Drizo and the Read Cycle are processes that achieve less than1 % water in regenerated glycol. These processes are difficult to model because of special details, andconvergence is a traditional problem in regeneration calculations. Models for all the glycolregeneration processes have been developed in the process simulation program HYSYS with thePeng Robinson equation of state. The models can also be implemented in other process simulationprograms and with other vapour/liquid equilibrium models. Parameters in the models have beenadjusted to simulate actual regeneration plant performance. The models have also been used toevaluate alternative regeneration processes.