Download Binary solutions of consolute liquids by Bancroft W.D., Davis H.L. PDF
By Bancroft W.D., Davis H.L.
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Extra resources for Binary solutions of consolute liquids
For diffuse waves the solute movement theory predicts that the zone spreading or band width is directly proportional to the distance traveled (see Figure 26B). Since linear chromatography theory predicts that zone spreading is proportional to V L , the diffuse wave effect is dominant. Thus the diffuse wave predictions shown in Figure 2- C Area Not Used Ottt Cp Area Used t MTZ FIGURE 2-22. t Breakthrough curve for step input. LUB approach. 6C are quite accurate except at the corners. At very low concentrations the Langmuir isotherm becomes linear and thus the solute movement theory underpredicts zone spreading.
For gas systems we may have us(Th) > us(Tc) and c(Tc) > c(Th). This is opposite to our intuition but does agree with some experimental results. If us(Th) > uth > us(Tc), Equation 2-45 predicts a negative concentration which is physically impossible. In this case the nonlinear mass balance Equation 2-44 must be solved. An alternate way to heat or cool the column is to use a jacket or heating coils. This is called the direct mode. Now the entire length of the column is heated or cooled simultaneously.
Comparison of these theories gives the Van Deemter equation, which has been modified by stochastic theories. This equation predicts the zone spreading effects in linear chromatography. Next, the theories will be used to predict the resolution of two components in linear chromatography, and finally superposition of these results onto the solute movement theory results will be discussed. A. Plate Theories In their classical paper on liquid-liquid chromatography, Martin and Synge695 developed a plate theory to explain zone spreading.