Examples of Presynthesis

To illustrate the algorithm of presynthesis, we examine two examples of homogenous azeotropic mixtures. The first example is a four-component mixture 

The structural condition of trajectory tear-off determines the vertexes Regl I the segments at the edges Regr,f and the regions at the faces RegJ concentration tetrahedron from points of which the trajectory tear-ofnnto it is 

3(Reg ) (unstable nodes N ), Regr - segments at edge 1-2 (RegJ ) and at edge 

The next step of presynthesis is determination of possible product regions Reg g in those two-dimensional faces of concentration tetrahedron that contain trajectory tear-off regions (i.e., in face 1-2-3 for the top product and in face 2-3-4 for the bottom product). We have to find contours of these regions Reg[oL i,n,B at the edges of faces 1-2-3,2-3-4. 

In accordance with the described algorithm, we have to examine ternary mixtures composed of each edge of these faces and of the component that is absent at the face (in the given example, only one component is absent for face 1-2-3, it is component 4 for face 2-3-4, it is component 1). Therefore, for face 1-2-3, it 

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