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Hydrogen bonding components

In certain circumstances, it may be necessary to distinguish between the different types of interactions. This can be performed in several ways (Barton, 1983 Van Krevelen, 1990). The most usual method is to make a distinction between dispersion (London), dipolar (Debye Keesom) and hydrogen-bonding components, each one being characterized by its contribution to CED and the corresponding solubility parameter, 8d, 8p, 8h, respectively, such that 8 = (8d + 8p + 8j )1/2. [Pg.302]

If water replaces dichloroacetic acid or trifluoroacetic acid as the hydrogen-bonding component in mixtures of decreasing polarity, then the helical content of disordered water-soluble polypeptide chains will increase continuously, as is, for example, the case with equimolar copoly-L-lysine-L-... [Pg.494]

Lo used the three-term solubility parameter (Barton, 1983) and a graphical procedure to identify solvents for liquid-liquid extraction. In a 2D space constructed from the polar component of the solubility parameter 6p and the hydrogen bonding component of the solubility parameter 6, the distribution coefficient of the solute B, mg, is given by... [Pg.299]

The total solubility parameter of our system is obtained from the square root of ced — Equation 2.44. The hydrogen bonding component of the solubility parameter is obtained from the equation ... [Pg.33]

Table 2.5 shows the calculated solubility parameters, 5, for hydrogen-bonded substances along with their hydrogen bonding component The nonhydrogen-bonding component, may be found from the equation ... [Pg.34]

The pressure dependence of solubility parameter and its hydrogen bonding component for this system, at T=31°C and at a 0.02 mole fraction of 1-propanol, are shown in Figure 2.11. As observed, the hydrogen bonding contribution, even at very low alkanol concentration, is significant in this system. [Pg.37]

The model used may evaluate the hydrogen bonding component of the solubility parameter directly and with no recourse to ambiguous concepts such as the homomorph concept. Apart from this, the model does not distinguish between the remaining polar and nonpolar contributions to 8. [Pg.37]

FIGURE 2.11 The effect of pressure on the solubility parameter and its hydrogen bonding component for the mixture CO2 + 1-propanol. [Pg.38]

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See also in sourсe #XX -- [ Pg.287 ]



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Hydrogen Components

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