Journal
ENERGY
Volume 201, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.energy.2020.117605
Keywords
Separation; IGCC syngas; ZIF-8; Slurry; Dimethylacetamide; Absorption-adsorption hybrid method
Categories
Funding
- National Natural Science Foundation of China [21636009, 51676207, 51576209]
- National Key Research and Development Program of China [2016YFC0304003, 2017YFC0307302]
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An absorption-adsorption hybrid method for separating the integrated gasification combined cycle (IGCC) syngas using ZIF-8/dimethylacetamide (DMAC) slurry was proposed. The viscosity of ZIF-8/DMAC slurries and its sorption performance of pure CO2 were investigated and one optimized slurry with moderate viscosity and high sorption capacity was proposed. Parallel absorption experiments show that the apparent solubility of CO2 in the slurry was doubled compared with that in pure liquid DMAC or propylene carbonate; it even overcomes that in aqueous monoethanolamine solutions at middle to high pressure range. More importantly, the slurry exhibits higher CO2 capture speed compared with conventional absorbents, while its desorption heat is only similar to 16 kJ/mol. The equilibrium separation results on H-2/CO2 mixtures using ZIF-8/DMAC slurry show that the selectivity of CO2 over H-2 ranged from 22 to 119; it increases with decreasing temperature or pressure, increasing initial gas to slurry ratio or CO2 concentration in feed gas. Only 4 theoretical equilibrium stages are required to achieve a sufficient separation of IGCC syngas. Regeneration test shows that the crystal structure of recovered ZIF-8 remains intact after 6 sorption-desorption cycles. This work provides an efficient method for the separation of IGCC syngas at pressure of 2-5 MPa. (C) 2020 Elsevier Ltd. All rights reserved.
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