Craig counter-current distribution tube

Figure 4.1 illustrates a Craig counter-current distribution tube. Chamber C [Figure 4.1(a)] in each such tube is filled with solvent Z that is heavier than the extracting solvent S. The volume of solvent Z is small enough so that when the... 

Figure 4.1 A Craige counter-current distribution tube...

Equation (4.6) enables a calculation of the mean in this Craig counter-current distribution and Eq. (4.5) yields an estimate of the standard deviation in the distribution among Craig tubes. For example, let us return to our two solutes, 1,2-DCA and EG. Earlier, we established values for p and q from a knowledge of D or, in the limit of purely molecular partitioning, Kj). Let us find /r and a for both compounds after 100 transfers (i.e., r = 100) have been performed ... 

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