Abstract

This chapter discusses some simple considerations on the design of preparative columns. The design of the column is a very important aspect in preparative liquid chromatography (PLC). The decrease in column efficiency with increasing injected quantity is an important matter in PLC since a certain number of plates is required to obtain a given purity. Small particles are associated with shorter and bulkier columns than large particles, while at the same time giving less back pressure. Mass overload is a thermodynamic effect related to the nonlinearity of the distribution isotherm. Concentration overload is a more complex situation, and no accurate mathematical solution is yet available to describe the peak profiles. Mass overload is a very important problem in PLC because it is usually associated with much larger throughputs than volume overload.

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