The present paper analyzes the separative performance of a “cryogenic-wall” thermal diffusion column of which the cold-wall temperature is lower than 77.35 K. Because the value of thermal diffusion factor αT for H2-HT mixture decreases in lower temperature region and is probably negative under ∼70 K, an estimated enhancement of the separation factor is not so large: the total separation factor (αβ)max of the column with rh = 0.015 cm, rc = 1.5 cm, Z = 150 cm and ΔT = 1200 K increases from ∼3.3×103( Tc = 77.35 K, Popt = ∼0.04 MPa) to ∼6.0×103( Tc = 30 K, Popt = ∼0.027 MPa) when the column is operated under the feed rate of 10 cm3(converted to the value of 0.1 MPa and 288.15 K)/min and the cut θ is 0.1.

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