*Analysis of Efficiency of Natural Gas Absorption Process from Water Impurities DOI: http://dx.doi.org/10.5772/intechopen.100417*


#### **Table 1.**

*Gas composition.*


#### **Table 2.**

*Parameters of the initial wet gas and TEG.*

#### **Figure 1.**

*Gas dehydration process in Unisim.*

Unisim's simulation of a typical absorption gas dehydration process is shown in **Figure 1** and combines gas absorption and glycol recovery.

The drying process illustrated in **Figure 1** is explained below.

The wet gas is first directed to a valve that operates to reduce the gas pressure. The wet gas enters the absorber column from below and the lean TEG enters from the top, falling into the absorber when it comes into contact with the wet gas flowing upward. Wet gas enters the T100 contactor at a pressure of 3862 kPa. This column absorbs part of the water contained in the gas thanks to the presence of triethylene glycol.

The dried gas is directed to the valve and then leaves it at a pressure of 3462 kPa.

The rich TEG leaves the bottom through the level control, passes through a valve where it is depressurized, and exits at a pressure of 3080 kPa.

The TEG containing water and hydrocarbons is sent to a stripping column (T101). The regenerator distillation column includes a reboiler operating at 205°C to prevent degradation of the TEG. The outgoing gases are condensed by the condenser, so the water vapor is directed to the outlet. The regenerated TEG sent to the bottom of the column (Regen Bottom), passing through the heat exchanger, will be sent to the mixer and mixed with a quantity of glycol to compensate for the losses of glycol.
