Dividing wall column application

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Presentation transcript:

Dividing wall column application in heterogeneous azeotropic distillation (In collaboration with PERSTORP, SWEDEN) Supervisor: Sigurd Skogestad Student : LE Quang Khoa

INTRODUCTION Dividing wall column is an application of thermally coupled Petlyuk column arrangement. This technology allows a significant energy reduction for separation of multicomponent. Heterogeneous azeotropic distillation is used in industry to separate close boiling point mixture and azeotropes. The system: Cyclohexanone, Water, Acetic Acid and heavy organics. Cyclohexanone, Water and Acetic Acid build a two liquid phase system Objective of project : Design and simulate ternary hetero-azeotropic distillation column in combination with deviding wall column.

PROJECT CHRONOLOGY Step 1: Rebuild and simulate the conventional arrangement using Aspen Plus Step 2: Optimize the conventional arrangement Step 3: Design and simulate heterogeneous azeotropic distillation column via dividing wall column

Conventional arrangement Step 1: Rebuild and simulate the conventional arrangement Conventional arrangement AA is Acetic Acid, CH is Cyclohexanone, W is Water and HE is Heavy Organics

Step 1: Rebuild and simulate the conventional arrangement VAPOR LIQUID EQUILIBRIUM ANALYSIS NRTL-HOC is chosen as thermodynamic model for the given system Cyclohexanone1-acetic acid2 Acetic acid1-water2 Cyclohexanone1-water2 Origin Regression to data B12 1715.54 255.44 -164.59 B21 113.07 19.412 1568.59 Α 1.267 0.3 0.2 Equilibrium data for the ternary system cyclohexanone- acetic acid- water were carried out in Perstorp Caprolactone and heavies activities are predicted in UNIFAC

Step 1: Rebuild and simulate the conventional arrangement VLE of Water/acetic Acid system

Step 1: Rebuild and simulate the conventional arrangement VLE of Water/Cyclohexanone system

Step 1: Rebuild and simulate the conventional arrangement

Step 2: Optimization of the conventional arrangement AZEOTROPIC COLUMN Operation condition: Feed entering into the stage 25. Total number of stage is 50. The feed stage is fixed ratio of the total number of stage (0.5)

Step 2: Optimization of the conventional arrangement 1/ Feed stage : Stage No 25

Step 2: Optimization of the conventional arrangement 2/ Total number of stage : The feed stage is fixed ratio of the total number of stage (0.5) Total No of stage FEED STAGE TOT_REB 44 22 3147.464 45 3147.182 46 23 3146.942 47 3147.127 48 24 3147.106 50 25 3145.964 51 3145.966 53 27 3147.024 54 3146.999 “Optimum”

Step 2: Optimization of the conventional arrangement 3/ Water reflux ratio: ( 90% of water, 10% of Cyclohexanone):

Thank you for your attention