Residue curve maps of 4-component systems. Singular point type determination for a 4-component azeotrope and the sets of feasible structures

Abstract

A method of singular point type determination for a 4-component azeotrope is proposed. The method deals with 2-dimensional structures known to be boundary surfaces of the residue curve map.

Keywords

• phase portrait of residue curve map
• singular point of a vector field formed by liquid-vapor equilibrium nodes<
• saddle point
• node poin
• azeotrope
• azeotropic relationship
• poincaré index sign