Na2SO4 deactivation Acetylene and propadiene elute after butanes. Best separation for butene isomers (impurities in butene streams). Methyl acetylene elutes after 1,3-butadiene. Cyclopropane (impurity in propylene) elutes well before propylene. Similar phases: Rt-Alumina BOND/Na2SO4, GS-ALUMINA, CP-Al2O3/Na2SO4, Alumina sulfate PLOT, AT-Alumina Temp. Range: up to 200°C