Summary and Relationship to Chapters Which Follow

The object of this chapter is to provide the reader with a qualitative understanding of hydrate phase equilibrium. Such an understanding implies a historical overview, which also provides successive approximations to hydrate phase equilibrium in terms of accuracy. The accuracy of three-phase prediction is given below in the order of increasing accuracy  

For pure components, use semilogarithmic interpolation between quadruple points Qi and Q2. 

For pure components, use Antoine s equation with constants given in Table 4.1. 

For mixtures, use the Kvsi method, as the most accurate method of this chapter. 

In the following chapter, the most accurate method available is discussed for the determination of hydrate equilibrium—that of statistical thermodynamics. The consideration of this method ties the macroscopic phase equilibrium, such as has been discussed qualitatively in the present chapter, to the microscopic structure discussed in Chapter 2. 

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