Absorption of CO2 Form Natural Gas via Gas-liquid PVDF Hollow Fiber Membrane Contactor and Potassium Glycinate as Solvent

Abstract

PVDF hollow fiber membranes were fabricated using Thermally Induced Phase Separation (TIPS) method. Gas-liquid interface is formed at the pore openings adjacent to the liquid. In the membrane contactor module, gas diffuses from the gas side across the membrane and reaches the gas liquid interface where gas is absorbed and then reacted in the presence of solvent such as aqueous sodium hydroxide or amine solutions. Nowadays, Monoethanol amine (MEA) and Diethanolamine (DEA) are the most commonly used solvents. In the present work potassium glycinate is used as an alternative liquid absorbent. A comprehensive two-dimensional mathematical model was developed for the transport of carbon dioxide-methane gas mixture through the in lab-made hollow fiber membrane contactor. Potassium glycinate is found to be a promising liquid absorbent. Model predictions were validated with experimental data. Results revealed that mass transfer rate generally increased with the absorbent concentration and that aqueous potassium glycinate solution performs better than MEA and DEA. The model equations were solved using COMSOL software package, model predictions were in good agreement with experimental data.

Removal of carbon dioxide by aqueous amino acid salts using hollow fiber membrane contactors

“…They concluded that the efficiency of the composite solution is evidently higher than that of the single glycine salt solution in coupling with hollow fiber membrane contactor. Ghasem et al [19] applied aqueous amino acid salts for CO 2 absorption. It was clearly seen from the results that the performance of CO 2 absorption using PG is always better than MEA and DEA under the identical operating circumstances.…”

Gas Separation Membrane Module Modeling: A Comprehensive Review

“…If a more sophisticated modeling approach is desired for analyzing in detail the mass, momentum, and heat-transfer effects inside the membrane module, 3D software tools such as COMSOL Multiphysics, ANSYS, and OpenFoam [56][57][58] can be used to account for actual module geometry and associated fluid contacting. However, 3D models can be computationally expensive, and therefore simulation times must be balanced with the level of accuracy wanted as the meshing requirements required for the solution to be mesh independent will lead to longer run times.…”