Rotary Concentric-Tube Distilling Column

Structure and effective charge characterization of proteins by a mobility capillary electrophoresis based method

“…With the same ion velocity profile, similar derivation procedures as in TDA could be applied in the dispersion coefficient calculation in MCE experiments. Developed by Westhaver,62,63 Taylor,64 and Aris,65 the TDA approach was further studied by Datta and Kotamarthi (1990) to obtain the following electrokinetic dispersion coefficient ( K i ) expression54,55 for the general case involving both pressure driven and electroosmotic flows: K i = D + R c 2 ( v p 2 + ∂ 2 v p v eo + ∂ 3 v eo 2 )/(48 D )where D is the diffusion coefficient, v p and v eo are the area-averaged Poiseuille and electroosmotic flow velocities, respectively, and ∂ 2 and ∂ 3 are dimensionless constants related to the dimensionless capillary radius. When v eo = 0, eqn (3) reduces to the “Taylor–Aris” expression.…”

A modified spinning-band column for low pressure fractionation

“…As a similar effect of rotation on efficiency has been observed in a column with a cylindrical rotor [Willingham et a/. (6)], it is likely that the suggestion of Birch et al that the efficiency of the spinning band column is explained by the pressure drop between front and rear faces of the rotor blade, creating conditions of evaporation and condensation at the reflux surface, concerns only a second order effect.…”

High Temperature Distillation

“…The most noteworthy laboratory column has been that of the National Bureau of Standards described by Willingham et al (60) as a rotary concentric-tube distilling column. This column has a packed length of 58.4 cm.…”