Outstanding Paper Awards Subcommittee of Journal of Chemical Engineering of Japan has assessed the 132 papers published in volume 44 into 2011, and the editorial board finally selected the five papers for JCEJ Outstanding Paper Awards of 2011; those are the papers on "Application of Ionic Liquids to Extraction Separation of Rare Earth Metals with an Effective Diglycol Amic Acid Extractant," "Relationship between Applied Static Magnetic Field Strength and Thermal Conductivity Values of Molten Materials Measured Using the EML Technique," "Investigation of Combustion Possibility of Upgrade ECO Coal as a Blended Fuel of Bituminous Coal Fired Power Plant," "Extraction Equilibria of Palladium(II) and Platinum(IV) with N, N-Di(2-ethylhexyl)aminomethylquinoline from Hydrochloric Acid," and "Geometric Structure and Formation Condition of Corded Isolated-Mixing Region in Impeller Agitated Vessel."