title: Thermodynamic and kinetic verification of tetra-n-butyl ammonium nitrate (TBANO3) as a promoter for the clathrate process applicable to precombustion carbon dioxide capture.
abstract: In this study, tetra-n-butyl ammonium nitrate (TBANO3) is evaluated as a promoter for precombustion capture of CO2 via hydrate formation. New hydrate phase equilibrium data for fuel gas (CO2/H2) mixture in presence of TBANO3 of various concentrations of 0.5, 1.0, 2.0, 3.0, and 3.7 mol % was determined and presented. Heat of hydrate dissociation was calculated using Clausius-Clapeyron equation and as the concentration of TBANO3 increases, the heat of hydrate dissociation also increases. Kinetic performance of TBANO3 as a promoter at different concentrations was evaluated at 6.0 MPa and 274.2 K. Based on induction time, gas uptake, separation factor, hydrate phase CO2 composition, and rate of hydrate growth, 1.0 mol % TBANO3 solution was found to be the optimum concentration at the experimental conditions of 6.0 MPa and 274.2 K for gas hydrate formation. A 93.0 mol % CO2 rich stream can be produced with a gas uptake of 0.0132 mol of gas/mol of water after one stage of hydrate formation in the presence of 1.0 mol % TBANO3 solution. Solubility measurements and microscopic images of kinetic measurements provide further insights to understand the reason for 1.0 mol % TBANO3 to be the optimum concentration.
authors: Department of Chemical and Biomolecular Engineering, National University of Singapore , Singapore, Singapore 117 576.
authors: Ponnivalavan
authors: P
authors: Babu
authors: Minghuang
authors: M
authors: Yao
authors: Stuti
authors: S
authors: Datta
authors: Rajnish
authors: R
authors: Kumar
authors: Praveen
authors: P
authors: Linga
mesh_terms: D002245:Carbon Dioxide / Q000737:chemistry* / Q000302:isolation & purification*; D052918:Environmental Restoration and Remediation; D005740:Gases / Q000737:chemistry; D007700:Kinetics; D000644:Quaternary Ammonium Compounds / Q000737:chemistry*; D013816:Thermodynamics; D014867:Water / Q000737:chemistry
chemical_list: D005740:Gases; D000644:Quaternary Ammonium Compounds; D014867:Water; D002245:Carbon Dioxide; C009405:tetrabutylammonium