Gas separation of flue gas by tetra-n-butylammonium bromide hydrates under moderate pressure conditions

Ionic clathrate hydrates are composed of water and ionic guest substance, which can selectively capture gas under moderate conditions. We performed gas separation experiments with tetra-n-butylammonium bromide (TBAB) widely-used for an ionic guest substance. The experiments in a closed system showed...

Full description

Saved in:
Bibliographic Details
Published in:Energy (Oxford) 2017-06, Vol.129, p.292-298
Main Authors: Hashimoto, Hidenori, Yamaguchi, Tsutomu, Kinoshita, Takahiro, Muromachi, Sanehiro
Format: Article
Language:English
Subjects:
Carbon dioxide
Carbon sequestration
CCS
Crystal growth
Flue gas
Gas flow
Gas hydrates
Gas separation
Gases
Hydrates
Ionic clathrate hydrate
Low pressure
Nitrogen
Pressure
Selectivity
Temperature effects
Tetra-n-butylammonium bromide
Tetrabutylammonium bromide
Tetrahydrofuran
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Ionic clathrate hydrates are composed of water and ionic guest substance, which can selectively capture gas under moderate conditions. We performed gas separation experiments with tetra-n-butylammonium bromide (TBAB) widely-used for an ionic guest substance. The experiments in a closed system showed good CO2 gas selectivity of the TBAB hydrates even under the mild conditions: 1 MPa and 282 K. We also performed the gas separation with tetrahydrofuran (THF) which is a guest substance forming the structure II clathrate hydrate. Comparison with THF clearly revealed the better CO2 selectivity of TBAB than that of the structure II clathrate hydrate. We further compared our data with the literature, and found that the condition of low pressure and dense TBAB concentration provided superior CO2 selectivity. Gas separation with continuous gas flow was demonstrated. The hydrate formation behavior was similar to the cases without gas flow. The results showed that controlling the crystal growth temperature is important to capture gases by the TBAB hydrates. •CO2 capture from CO2 + N2 mixed gas by TBAB hydrates under moderate pressure.•Experiments both with and without continuous gas flow.•TBAB hydrates captured sufficient CO2 at low pressure in a short period.•High CO2 Separation factor of TBAB hydrate: 21.9•TBAB hydrates have higher CO2 selectivity than THF hydrates.
ISSN:0360-5442
1873-6785
DOI:10.1016/j.energy.2017.04.074