Air Particle Selection for High Efficiency Packed Columns

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Abstract
High efficiency packed [gas chromatography] columns can be obtained by careful selection of solid support particles with respect to density and size. Use of hardened particles lessens attrition from handling to form fines after selection. The solid support material is washed with acid and base, and thorough washing with water eliminates most of the fines. The treated material is particle-selected by dropping through a horizontal air stream. The larger, denser particles are displaced least by the air stream, and the smaller and less dense particles are displaced to greater extents. The separated material ranges over a 2-fold difference in bulk density. The center cuts are carefully impregnated with stationary liquid and then re-selected. Thus, impregnated particles of narrow size and density are obtained. A simple device for particle selection is described. Packed columns with an average of about 500 theoretical plates per foot can be consistently obtained with such selected solid support. Less pressure drop is observed with this selected material than that observed with support material containing fines; therefore, packed columns which have 10,000 to 40,000 theoretical plates can be obtained and used with standard equipment.

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