Thermochromatographic columns temperature profile

Fig. 1.1 Schematic of an experimental setup for thermochromatographic separations. The carrier gases Cl2 or Cl2 + CCI4 also served as chlorination agents the 90 cm long quartz column was of 0.5 cm i.d. Processing lasted several hours. Except for the initial and ending segments of the column, over some 60 cm, the temperature profile was nearly exponential.

Based on a microscopic model of gas-solid thermochromatography in open columns by Zvara (1985), a Monte Carlo code has been made available (Tiirler 1996), which allows to generate thermochromatographic deposition zones as well as yield versus temperature curves as observed in isothermal chromatography. This model accommodates the influence of the carrier gas flow, the actual temperature profiles, and the different half-lives of the investigated species. For each isothermal temperature, the transport through the column is modeled for a large number of sample molecules. These calculations result in a curve of yield versus temperature for each value of the adsorption enthalpy The curve for the particular... 

Element distribution in a thermochromatographic column with 9 vol% hydrogen bromide as reactive additive to the carrier gas nitrogen, together with the temperature profile along the column. Quartz-powder column, 15 min exposure time (Reproduced with permission from Radiochimica Acta, Hickmann et al. 1993)... 

Thermochromatographic setup and typical profile of temperature along the column (Reproduced with permission from Radiochimica Acta, Hickmann et al. 1993)... 

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