The chromatographic processes for preparation of isotope-free hydrogen

Based on the reviews of the chromatographic processes for hydrogen isotope separation, an expression has been obtained from the derivations concerning the moment analysis to calculate the hydrogen isotope separation factors for porous hydrogen-adsorbing materials. The combination of derivations with experiment data results in a design of the parametric pumping with intermetallic compounds as its absorbents and the organic solutions of hydrogen as its fluid phase for preparation of isotope-free hydrogen. The eigenvalue of the process in the optimized conditions for LaNi5/n-undecane/hydrogen system is in a range of 0.67 - 0.75, which is small enough to make the process a competitive one. In discussion of the factors that affect the separation process, the ratio of the hydrogen capacities of solid and liquid phase has been found to be of decisive importance besides the equilibrium separation factor. (author)