Modeling and Optimization on the Carbon  Dioxide Separation from Natural Gas Using  Hydrotalcite-Silica Membrane

Ahmed Daham Wiheeb

doi:10.24237/djes.2018.11307

Authors

Ahmed Daham Wiheeb
chahmed@tu.edu.iq
Department of Chemical Engineering, College of Engineering, Diyala University,Iraq

Keywords:

Hydrotalcite, porous membrane, carbon dioxide capture, response surface methodology

Abstract

The process modeling and optimization of carbon dioxide (CO₂) separation from carbon dioxide-methane (CH₄) binary gas mixture through hydrotalcite (HT)-silica membrane using statistical design of experiments (DoE) is reported in this study. The effect of three important process variables, pressure difference across the membrane (100-500 kPa), temperature (30-190^oC) and CO₂ feed concentration (10-50%) on the CO₂ separation performance of the membrane were investigated. The response surface methodology (RSM) coupled with central composite design (CCD) was used to build up two models to correlate the effect of process conditions to CO2 permeance and CO₂/CH₄ separation selectivity. The analysis of variance (ANOVA) of the quadratic model at 95% conﬁdence interval confirmed that the model was highly signiﬁcant. The CO₂ feed concentration with 43% showed the best performance with a CO₂ permeance of 6.0x10^-7 mol.m^-2.s^-1.Pa^-1 and a CO₂/CH₄ separation selectivity of 109 at 100 kPa pressure difference across the membrane and temperature of 30^oC

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