The Extent of Separation: Close Separations

Analogy between the depolymerization and separation processes. Application to the statistical evaluation of complex chromatograms

“…Another one has been called, by Rony, the extent of separation (18). Although also normalized between 0 and 1 and especially derived in the case of elution chromatography (19)(20)(21), it has, however, no similarity with the above 7 parameter, especially because it only applies to binary mixtures. The measurement of the entropy of separation has been suggested as a general separation criterion (22).…”

“…The two first moments of the distribution are given by mx = ( • )/ (16) i=l and m2 = ( ? )/ (17) i=l The polydispersity index, µ , is then, according to eq 12, equal to µ = p(Lo¡2)/(Zo¡)2 (18) If the relative peak areas, rit are known, with r¡ = ;/( ;) (19) then eq 18 becomes The desired values of the extent of separation and of the number of constituents are obtained by combination of eq 13-15, 18, and 20 7 = 2-[pCEO/CEoi)2] = 2 -[ ( 2)] (21) and…”

Gas chromatography

“…The resolution of a binary mixture was established on the basis of the theory of finite concentrations (407). The concept of the extent of separation has been extended and compared for 12 separation methods (796). The maximum number of solutes which can be resolved between the air peak and the last component is the peak capacity and Grushka (390) showed the influence of the experimental conditions on this efficiency factor.…”