“…Data for the systems methyl isobutyl ketone and aqueous hydrochloric acid with sodium dichromate, vanadio acid, and sodium dichromate-vanadic acid mixtures were reported (267). Methods of predicting quaternary equilibria from ternary data were reviewed by Brancker (24,25), and graphical representations of quaternary (26,199,246), quinary (131), and polycomponent (192) equilibria were described. A system containing eight liquid phases in equilibrium was discovered (137).…”