48695528 the-sulphur-system

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48695528 the-sulphur-system

  1. 1. The Sulphur System Presented By Hitesh Wagle
  2. 2. The Sulphur System <ul><li>Sulphur can exists in four possible phases: </li></ul><ul><li>Two solid polymorphic phases </li></ul><ul><ul><li>Rhombic Sulphur (S R ) (m.p. 114°C) </li></ul></ul><ul><ul><li>Monoclinic Sulphur (S M ) (m.p. 120°C) </li></ul></ul><ul><li>Sulphur Liquid </li></ul><ul><li>Sulphur Vapours </li></ul>
  3. 3. Components & Phase Rule <ul><li>All the four phases can be represented by the only chemical individual “SULPHUR” itself. </li></ul><ul><li>Hence an one component system. </li></ul><ul><li>Phase rule (F= C-P+2) becomes: </li></ul><ul><li>F= 3-P </li></ul>
  4. 4. Phase Diagram of Sulphur System
  5. 5. Solid Rhombic (S R ) Liquid (L) Vapour (V) 1 atm A B C D E G F Solid Monoclinic (S M ) 95.6 Pressure (atm) Temperature °C 114 120 444.6 B.P. S R /V S M /V L/V S M /L S R /S M S R /L 1290 atm 165
  6. 6. Curves In Phase Diagram <ul><li>Curve AB: Sublimation Curve of Rhombic Sulphur </li></ul><ul><li>Curve BC: Sublimation Curve of Monoclinic Sulphur </li></ul><ul><li>Curve CD: Vapour Pressure Curve of Liquid Sulphur </li></ul><ul><li>Curve CE: Fusion Curve of Monoclinic Sulphur </li></ul><ul><li>Curve BE: Transition Curve Solid Sulphur </li></ul><ul><li>Curve EG: Fusion Curve of Rhombic Sulphur </li></ul><ul><li>At any curve, phase rule becomes, F= 3-P = 3-2 = 1 (Monovarient) </li></ul>
  7. 7. Curve AB: Sublimation Curve of Rhombic Sulphur
  8. 8. Curve BC: Sublimation Curve of Monoclinic Sulphur
  9. 9. Curve CD: Vapour Pressure Curve of Liquid Sulphur
  10. 10. Curve CE: Fusion Curve of Monoclinic Sulphur
  11. 11. Curve BE: Transition Curve of Solid Sulphur
  12. 12. Curve EG: Fusion Curve of Rhombic Sulphur
  13. 13. Triple Points <ul><li>Triple Point B </li></ul><ul><li>Triple Point C </li></ul><ul><li>Triple Point E </li></ul><ul><li>At any Triple Point, phase rule becomes: F = 3-P = 3-3 = 0 (nonvarient) </li></ul>
  14. 14. Areas in Phase Diagram <ul><li>Area ABEG (Rhombic Sulphur) </li></ul><ul><li>Area BCEB (Monoclinic Sulphur) </li></ul><ul><li>Area DCEG (Sulphur Liquid) </li></ul><ul><li>Area ABCD (Sulphur Vapours) </li></ul><ul><li>In an area, Phase Rule becomes: F = 3-P= 3-1 = 2 (bivariant) </li></ul>
  15. 15. Metastable Equilibrium <ul><li>3 Dashed curve: </li></ul><ul><ul><li>curve BF (sublimation curve of metastable S R ) </li></ul></ul><ul><ul><li>curve CF (vapour press. Curve of supercooled liquid sulphur) </li></ul></ul><ul><ul><li>curve FE (fusion curve of metastable S R ) </li></ul></ul><ul><li>One triple point F </li></ul><ul><li>3 areas: Area ABFE (Metastable S R ) Area ABFCD (Sulphur vapours) Area DCFE (supercooled liquid sulphur) </li></ul>
  16. 16. Thank You

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