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5.5 Phase diagrams of three-component systems ---ternary phase diagrams ( ) T or ( ) P ( ) T,P
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The Gibbs Triangle Equilateral triangle coordinates
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a'a' b'b' c'c' O, content point Content of A in the system Content of B in the system Content of A in the system Mass fraction
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22%B, 36%C, 42%A
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5.5.1 Composition characters for equilateral triangle coordinates d,e,f the mass fractions of A are equal Points on AD line, On line AD, D’ is closer to A than D, the mass fraction of A in D’ is more than that in D
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The level rule for three-component systems D+EO O must be on the line DE Tie line
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Sb S b The mass fraction of A decrease, m A of A is separated from S (Φ=2, L+A) m A of A is added into the system
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Centre-of-gravity rule of three-components system D + E + FH
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5.5.2 Partly miscible three-components liquid system a1-a4, b1-b4, a1-b1, a2-b2,a3-b3….. conjugate solution O: isothermal consolute point aob: binoal curve
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B: H2O:Butanol:CH3COOH=30%:30%:40%=A+C A: 43%:22%:35% C: 14%:63%:23% A:C = 23:18
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T - x 1 , x 2 Two phase Single phase There are one couple of partly miscible components
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Two couples of partly miscible components Vinyl cyanide(A) water(B) ethanol(C) Two-phase Single phase
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Two-phase Single phase L1 Single phase L2
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There are three couples of partly miscible components Vinyl cyanide(A) water(B) ether(C) Single phase Two-phase
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Φ=1 Φ=3 D,E, F
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Separation of liquid mixtures by extraction
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Extraction Column
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5.5.3 Ternary water-salts systems Φ=1 L Φ=2 B(s), L Φ=2 C(s), L Φ=3, B(s), C(s), F Φ=3, the saturation solution of B and C
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How to get pure B from mixtures of B and C Q-----R(L+B)
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T=298K T=373K Effect of temperature on phase diagram
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Purification of salt X(KNO 3 +NaNO 3 )…..D(298K)+KNO 3 …D(373K)…
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X’: W……D‘……y……D
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5.5.4 Three-component system containing three binary eutectic points
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T-x
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Pb-Sn-Bi trinary system Φ=1, L Φ=2, L+Pb Φ=2, L+Sn Φ=2, L+Bi Triple point Bi/Sn, Sn/Pb, Pb/Bi
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Φ=3, L+Bi(S)+Sn(S) Eutectic T decrease E4, L+Bi(S)+Sn(S)+Pb(S) Φ=3, L+Pb(S)+Sn(S)
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T decrease: A(Φ=1,L)… L+Bi(S) L+Bi(S)+Sn(S) L+Bi(S)+Sn(S)+Pb(S) Φ=4, f=0
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The composition variation path
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5.6 The surfactant/oil/water trinary system
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Homework Y: P188 39 Review the whole chapter
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