**1. Introduction**

Absorption is known to be the most common drying method among the various gas drying processes.

During the absorption process, water vapor in the gas stream is absorbed in the liquid solvent stream. The liquid solvents used are glycols and the most commonly used are triethylene glycol and diethylene glycol.

The main technological parameters of the absorption process are temperature, pressure, the nature of the absorbent, the concentration of the regenerated absorbent, and the frequency of circulation of the absorbent.

However, according to several studies, TEG is the most used because of its ease of regeneration at concentrations from 98 to 99.9% as they approach properties that meet the criteria for commercial use [1, 2].

In general, the choice of the process mode and absorbent depends on the required depression of the gas dew point.

The depth of gas drying from moisture significantly depends on the concentration of glycol at the inlet to the absorber.

To deepen gas drying, vacuum desorption of moisture from glycol is used (at a pressure of 0.060–0.080 MPa and a temperature of about 205°C). The concentration of regenerated glycol, in this case, increases to 99.5%, and the dew point depression increases to 50–70°С [3].

The aim of this study is to dehydrate natural gas and evaluate the influence of the parameters involved in the absorption process in order to be able to optimize the absorption process using the most optimal parameters in accordance with the desired level of dehydration.

At present, di- and tri-ethylene glycol are used as absorbents for gas preparation [4].

The choice of solvent depends on the application. Typically, the solvent must meet the following criteria—high solubility of the solute to reduce the amount of solvent used; low volatility to reduce losses; does not cause corrosion; low viscosity for a high rate of mass transfer; safe; does not foam.

Glycols meet these criteria in the case of gas dehydration. The most popular glycol used for offshore gas processing is triethylene glycol (TEG).

The efficiency of natural gas dehydration by the absorption method depends on the nature of the absorbent, the concentration of the absorbent at the inlet to the absorber, the circulation rate of the absorbent, and the thermodynamic parameters of absorption [5].
