Coals ranging from lignite to high rank bituminous coal were extracted with N -methyl-2-pyrrolidone (NMP), ethylenediamine (EDA), and NMP containing a small amount of EDA (e,N) under reflux conditions at atmospheric pressure. The extraction yield was maximum in the third case suggesting a synergistic effect of the system. The system was found to enhance the extraction yield in NMP. Stepwise successive extraction in NMP was also possible using this system. A possible explanation for the results obtained is given.
No takes yet. Share an insight, caveat, or question.
Pande et al. (2001) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: