1 / 13

CHEN 4460 – Process Synthesis, Simulation and Optimization

Azeotropic Distillation. CHEN 4460 – Process Synthesis, Simulation and Optimization Dr. Mario Richard Eden Department of Chemical Engineering Auburn University Lab Lecture No. 3 – Sequencing of Azeotropic Distillation Columns October 2, 2012

Download Presentation

CHEN 4460 – Process Synthesis, Simulation and Optimization

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Azeotropic Distillation CHEN 4460 – Process Synthesis, Simulation and Optimization Dr. Mario Richard EdenDepartment of Chemical EngineeringAuburn University Lab Lecture No. 3 – Sequencing of Azeotropic Distillation Columns October 2, 2012 Contains Material Developed by Dr. Daniel R. Lewin, Technion, Israel

  2. Introduction • When two or more components differ in boiling by less than approximately 50C and form a nonideal liquid solution, the relative volatility may be below 1.10. • Then ordinary distillation may be uneconomic, and if an azeotrope forms even impossible. • In that event, the following separation techniques, referred as enhanced distillation by Stichlmair, Fair, and Bravo, should be explored: • Extractive distillation • Salt distillation • Pressure-swing distillation • Homogeneous azeotropic distillation • Heterogeneous azeotropic distillation • Reactive distillation

  3. Example 1 • Given that methyl acetate (1), which boils at 57.8C, methanol (2), which boils at 64.7C and n-hexane (3), which boils at 68.7C. • Sketch any boundaries across which the residue curves cannot traverse. • Sketch the residue curves for three feed compositions:

  4. Example 1 • Note the existence of four azeotropes, where compositions are in mol %:

  5. Example 1 – Solution • Plot pure components on vertices with Tb • Plot all azeotropes on diagram with Tb • Plot the residue curves connecting all azeotropes, azeotropes & vertices, and finally vertices & vertices with arrow heads pointing towards increasing boiling point temperatures

  6. Example 1 – Solution • Plot pure components on vertices with Tb • Plot all azeotropes on diagram with Tb • Plot the residue curves connecting all azeotropes, azeotropes & vertices, and finally vertices & vertices with arrow heads pointing towards increasing boiling point temperatures • Plot additional residue curves that “arch” towards intermediate temperatures on the way to the end point Feed I

  7. Example 1 – Solution • Plot pure components on vertices with Tb • Plot all azeotropes on diagram with Tb • Plot the residue curves connecting all azeotropes, azeotropes & vertices, and finally vertices & vertices with arrow heads pointing towards increasing boiling point temperatures • Plot additional residue curves that “arch” towards intermediate temperatures on the way to the end point Feed III Feed I

  8. Example 1 – Solution • Plot pure components on vertices with Tb • Plot all azeotropes on diagram with Tb • Plot the residue curves connecting all azeotropes, azeotropes & vertices, and finally vertices & vertices with arrow heads pointing towards increasing boiling point temperatures • Plot additional residue curves that “arch” towards intermediate temperatures on the way to the end point Feed II Feed III Feed I

  9. Example 1 – Solution • Plot pure components on vertices with Tb • Plot all azeotropes on diagram with Tb • Plot the residue curves connecting all azeotropes, azeotropes & vertices, and finally vertices & vertices with arrow heads pointing towards increasing boiling point temperatures • Plot additional residue curves that “arch” towards intermediate temperatures on the way to the end point

  10. Example 2 • A stream consisting of a mixture of A, an organic component, and water, B, which forms an azeotrope. A separation process is to be designed to obtain pure products A and B. The plant manager suggests that you investigate the possibility of using component C as MSA.

  11. Example 2 • Indicate the location of the azeotropes on a ternary diagram, as well as representative residue curves. • Suggest a process for the separation of A and B into pure products and show its operating lines on the ternary diagram. • Draw a PFD for your process. Indicate flow rates of all internal and external streams as multiples of the flow rate of F.

  12. III, 330 K I, 350 K IV, 315 K C II, 360 K Example 2 – Solution 360 K 370 K 400 K

  13. M1 F M2 B2 D1 M2 F S2 M1 S1 C B1 Example 2 – Solution S2 D2 D1 360 K S1 B2 B1 III, 330 K I, 350 K D2 IV, 315 K II, 360 K 370 K 400 K

More Related