Rt-alumina BOND/Na₂SO₄ columns (fused silica PLOT) are used for Na₂SO₄ deactivation.

• Acetylene and propadiene elute after butanes
• Ideal separation for butene isomers (impurities in butene streams)
• Methyl acetylene elutes after 1,3-butadiene
• Cyclopropane (impurity in propylene) elutes well before propylene
• Stable to 200 °C

Similar phases: GS-alumina,CP-Al₂O₃/Na₂SO₄, alumina-sulphate, AT-alumina.