Modeling of acid gases separation via ionic liquids and membrane and performance comparison between two different membrane

Subject Areas : Environmental pollutions (water, soil and air)

Behnam Beigi ¹ , Nadia Esfandiari ²

1 - MS, Department of Chemical Engineering, Marvdasht Branch, Islamic Azad University, Marvdasht, Iran.
2 - Assistant Professor, Department of Chemical Engineering, Marvdasht Branch, Islamic Azad University, Marvdasht, Iran.*(Corresponding Author)

Received: 2018-03-24 Accepted : 2018-06-13 Published : 2022-02-20

Keywords: Membrane, Carbon dioxide, Hydrogen sulfide, Ionic liquid, Separation,

Abstract :

Background and Objective: Natural gas produced from oil and gas wells often contains hydrogen sulfide and carbon dioxide, which are so-called “sour gasses”. Carbon dioxide (in large quantities) and hydrogen sulfide (even in small quantities) cause many problems during the transmission and consumption of natural gas. In this study, mathematical model for the separation of carbon dioxide and hydrogen sulfide from helium has been investigated with two different membrane species including a ceramic modulus and PEEK-L II and ionic liquids.Material and Methodology: The effect of material, diameter, pressure and temperature on separation efficiency has been investigated. The ionic liquid used in this study is [hemim] [BF4]. The ceramic and PEEK-L II was studied. The pressure and concentration during absorption is investigated. The concentration variations of carbon dioxide and hydrogen sulfide in ionic fluid were investigated in time.Findings: For a ceramic modulus, about 50 to 60% of the pressure drop occurs in the first 100 to 120 seconds. For the PEEK-L II modulus, in the first 30 seconds, about 50 to 60% of the pressure drop occurs due to gas absorption. The effect of temperature on the concentration of carbon dioxide and hydrogen sulfide at three temperatures of 25, 50 and 100 °C was investigated. As the temperature rises in the ceramic modulus, the amounts of carbon dioxide and hydrogen sulfide, passing through the membrane, increase.Discussion and Conclusion: As the time increases, the concentrations of carbon dioxide and hydrogen sulfide in the ionic fluid are increasing. With increasing temperature from 25 to 100 ° C, the amount of absorbed acidic gases into ionic liquid was increased. The PEEK-L II modules removed more acidic gases than the ceramic modules.

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