Some Factors Affecting the Efficiency of Preparative Scale Gas Chromatography

Large-Scale, Preparative Paper Chromatography

Most of the techniques that have been described for large-scale, preparative paper c hromatograp hy depe nd on an i.ncrease in bulk through the use of many closely pressed layers of a thin paper [IJ.' So me of these methods require the tedious loading of each s hee t , and others tend to suffer from a lack of uniformity in the movement of compounds thro ughout the bulk. Th e latter disadvantage...

Some factors affecting sieving performance and efficiency

Factors affecting selection of mobile phase in gas Chromatography

Selection of mobile phases markedly affect separation efficiency of eluted probes in gas chromatography (GC), the mobile phases have a pronounced effect on the retention times and efficiency of natural gas separation. In solid chromatography, carrier gases which are adsorbed to any extent occupy more active adsorption sites, reducing the net heat of adsorption of the eluted zone. The efficiency...

assessment of the efficiency of s.p.g.c refineries using network dea

data envelopment analysis (dea) is a powerful tool for measuring relative efficiency of organizational units referred to as decision making units (dmus). in most cases dmus have network structures with internal linking activities. traditional dea models, however, consider dmus as black boxes with no regard to their linking activities and therefore do not provide decision makers with the reasons...

Preparative Supercritical Fluid Chromatography

Supercritical Suid chromatography (SFC) on a preparative scale is of interest because of its advantages over high performance liquid chromatography (HPLC). The high diffusivity and low viscosity of supercritical Suids allow rapid separation. The solvent strength can easily be controlled by changing pressure and/or temperature, so that mobile phases with a Rxed composition can be used to separat...