Impact of N-Methyl-2-pyrrolidone Erosion on Surface Functional Groups and Pore Evolution in Coals of Different Ranks
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View abstract on PubMed
Summary
This summary is machine-generated.N-methyl-2-pyrrolidone (NMP) enhances coalbed methane production by altering coal functional groups and pore structure. Its effectiveness decreases with increasing coal rank, with lignite and bituminous coal showing significant porosity improvements.
Area Of Science
- Geochemistry
- Petroleum Engineering
- Materials Science
Background
- Low-permeability coal reservoirs pose challenges for methane extraction.
- Organic solvents like N-methyl-2-pyrrolidone (NMP) show potential for improving coal properties.
- Mechanisms of NMP's effect on coal functional groups and pore structure require further elucidation.
Purpose Of The Study
- To investigate the impact of NMP treatment on the functional groups and pore structure of lignite, bituminous coal, and anthracite.
- To elucidate the mechanisms by which NMP alters coal properties.
- To assess the relationship between coal rank and NMP effectiveness.
Main Methods
- Fourier transform infrared spectroscopy (FTIR) was used to analyze changes in coal functional groups.
- Low-field nuclear magnetic resonance (LF-NMR) was employed to characterize pore structure modifications.
- Three coal ranks (lignite, bituminous, and anthracite) were subjected to a 6-hour NMP treatment.
Main Results
- NMP treatment increased oxygen-containing functional groups and aromaticity, particularly in lignite.
- Hydroxyl and aliphatic hydrocarbon content decreased after NMP exposure.
- Porosity increased significantly in lignite (84.82%) and bituminous coal (43.56%), but minimally in anthracite (3.04%).
Conclusions
- NMP selectively dissolves organic molecules, enhancing pore connectivity and promoting micro- to meso- and macropore development.
- NMP's effectiveness in modifying coal pore structure diminishes with increasing coal rank.
- NMP shows promise for enhancing coalbed methane production by improving coal reservoir properties.
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