Simulation of the absorption tower of the gas dehydration unit and estimation of the BTEX solubility in TEG

One of the most important steps of gas processing is the gas dehydration. In this unit, water vapor from thenatural gas stream is removed by absorption into a solvent such as tri-ethylene glycol (TEG). From the environmentalpoint of view, a problem of this unit is the solubility of the aromatic compounds, mainly benzene, toluene,ethylbenzene, xylenes (BTEX) in TEG and then release of these compounds into the atmosphere. Accurate simulationof this units can be a great help to optimize the operating parameters and reduce the emission rate of this materials. Inthis work, the Peng-Robinson (PR) Equation of State (EOS) is used for estimating the BTEX solubility in TEG in theabsorber. Since the final emission rate is determined by the solubility in absorber, this work focuses on the simulationof absorber. The absorber is simulated using a customized code and no simulation software is used. At steadyconditions, the amount of absorption of BTEX into TEG determines the amount of BTEX emissions into atmosphere.

کلیدواژه ها:

Natural Gas ، Dehydration ، PR EOS ، TEG ، BTEX