Abstract
Development of covalent organic polymer (COP) is a potential new class of adsorbent for CO2 separation from natural gas mainly due to their good hydrothermal stability, chemical tuning flexibility and low cost. CO2 and methane adsorption on COP-1 was studied under atmospheric condition (101.3 kPa, 298 K). COP-1 was synthesized via catalyst-free polycondensation of cyanuric chloride and piperazine. The properties of COP-1 were characterized using several analytical methods such as Fourier Transform Infra-Red (FTIR), N2 adsorption and desorption measurement and Field Transmission Electron Microscopy in coupled of Energy Dispersive X-ray Spectroscopy (FESEM-EDS). Reversible CO2 adsorption isotherm on COP-1 reflects low heat of adsorption which is beneficial to energy minimization in adsorbent regeneration process. Furthermore, moderate specific surface area COP-1 (88.5 m2/g) shows about nine times CO2 uptake higher than methane. The highly selective adsorption performance provides a promising insight in application of COP adsorbent for CO2 removal in natural gas field.
Highlights
Removal of CO2 from gas reservoirs is highly important since the presence of CO2 can cause operational problem such as solid formation and top-line corrosion in wet-gas pipelines [1]
It is confirmed that the polycondensation reaction for covalent organic polymer (COP)-1 synthesis was fully completed in this study
Isotherm of COP-1 is plotted in Fig. 3 as the quantity adsorbed against the relative pressure
Summary
Removal of CO2 from gas reservoirs is highly important since the presence of CO2 can cause operational problem such as solid formation and top-line corrosion in wet-gas pipelines [1]. The common method for CO2 removal from natural gas is via chemical absorption process using alkanoamine This technology is subjected to operational drawbacks such as high rate of corrosion on equipment, degradation of solvent through oxidation, high energy consumption for regeneration and large absorber volume [3, 4]. This drives the research for alternative gas treating technologies for CO2 removal from natural gas reservoirs that is robust with higher removal efficiency and low operational problems. These materials are very flexible in terms of structure tuning and properties through rational chemical design
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