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- W2331726586 abstract "The dependence of the capacity ratio (k′), the selectivity, and the height equivalent to a theoretical plate as a function of the average linear velocity (ū), the column length (L), and the pressure drop over the column (Δp) was studied for a model chromatographic system in supercritical fluid chromatography (SFC). The model system consisted of an 80:20 (v/v) mixture of CO2 and methanol as the mobile phase, unbonded silica gel in a packed column as the stationary phase, and a mixture of four polycyclic aromatic hydrocarbons as the analyte. Other conditions were a constant column temperature of 125°C and column exit pressures of 200, 250, and 300 bar. It was found that k′ depended to a significant extent on ū, L, and Δp, which is particularly obvious at the low pressure of 200 bar. Selectivity depended much less on these physical variables. The height equivalent to a theoretical plate was also little affected by ū, L, and Δp, considering the high velocity branch of the van Deemter curve; this branch is the important part of the curve for practical purposes. Within the range of velocity and column lengths investigated, as well as for the ranges of pressure drop and column end pressures, the finding of similar plate height equivalents for different column lengths leads to a column efficiency that is approximately proportional to column length. Therefore, efficiency in SFC can be greatly increased by increasing L, as is the case for gas and liquid chromatography." @default.
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- W2331726586 date "1994-10-01" @default.
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- W2331726586 title "Influence of Linear Velocity, Column Length, and Pressure Drop in SFC. I. Capacity Ratios, Selectivities, and Theoretical Plate Heights" @default.
- W2331726586 doi "https://doi.org/10.1093/chromsci/32.10.461" @default.
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