A modified spinning band column for low pressure fractionation
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A spinning band fractionating column is described for operation at pressures down to 0.5 mm. of mercury. A study has been made of various designs of rotor. One type consisting of flat blades of stainless steel interspaced with bearings at regular intervals, which centered it in the column, gave an H.E.T.P. of 2.07 cm. at atmospheric pressure. At low pressures (0.5 mm.) its efficiency was found to be small, and a more suitable rotor has been developed in which strips of stainless steel gauze are attached to the blades. These wipe the walls of the column and provide an even film of reflux. Sharp separations of fatty, acid methyl esters, fatty alcohols, and acetates have been made, using this rotor at pressures of 0.5–2.0 mm. On account of the low pressure drop (0.4 mm. mercury) it is possible to fractionate compounds with 30 or 32 carbon atoms without decomposition.
KeywordsColumn Efficiency Column Wall Sharp Separation Sodium Alkyl Sulphate Butyl Phthalate
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