The vapor compositions predicted by the method of Mixon et al. are in excellent agreement with those predicted by the two-parameter activity coefficient models represented by the Margules model. For example, the calculated values of the vapor compositions by these two methods are given in Tables 6.26.8 for the chosen sets of data. Further, the vapor compositions predicted by the Margules model using the MLH method and the Genetic algorithm are given in Tables 6.9.a 6.9.g. for the chosen sets of data.

DESIGN OF COLUMN & INTERNALS OVER VIEWJawaharlal Nehru Technological University KakinadaPresented byProf. K. V. RaoAcademic Advisor / Visiting ProfessorPetroleum CoursesJNTUKIII Year B. Tech. Petrochemical Engineering II Sem.1Distillation -Definition

Distillation Operation

Distillation Design

Column Internals

Trays and Packing: Design aspects

ContentsBASIC OPERATION OF DISTILLATION COLUMN

Distillation is a process in which a liquid or vapour mixture of two or more substances is separated into its component fractions of desired purity, by the application and removal of heat.

It is a unit operation and the components to be separated depends on the differences in boiling points of the individual components. Also, depending on the concentrations of the components present .

Methods Of Distillation :

Differential or Simple DistillationFlash DistillationRectification or Fractionational Distillation

Distillation Operation

Distillation Operation

Distillation Operation

Distillation Operation

Distillation Operation

Distillation Operation

Distillation Operation

Distillation Operation

DISTILLATION - DESIGN13

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45Column Internals :The plates or trays are contacting devices and used to hold up the liquid to provide better contact between vapour and liquid, hence better separation .

1. Trays /Plates 2. Packings

Bubble Cap / Valve traysIn valve trays / Bubble Cap trays, perforations are covered by liftable caps. Vapour flows lifts the caps, thus self creating a flow area for the passage of vapour. The lifting cap directs the vapour to flow horizontally into the liquid, thus providing better mixing

Typical Flow of Vapors & Liquids Inside the Column Packings :

PALL RINGRASCHIG RINGINTALOX SADDLETypical Tray SectionOutlet WeirInlet WeirSeal PotDowncomerTraysClassification of Trays

Based on the Number of liquid paths

2. Two Pass3. Three Pass4. Four Pass1. Single PassCOLUMN REBOILERS

Merits & Demerits of Trays53

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Thank You61