c28420-lecture9-2009

c28420-lecture9-2009 - Course 28420 Lecture 9 28420 Topics...

This preview shows pages 1–7. Sign up to view the full content.

Course 28420: Lecture 9 Topics to be covered: Batch Distillation hapter 13) (Chapter 13) Rafiqul Gani 28420: Separation Process Principles - Lecture 9 (2009) 1

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
3 ) Batch or Differential Distillation odel Assumptions: (13-1) Rayleigh Equation Model Assumptions: Close-boiling mixture; K-value is independent of composition; y = K x (13-2) y = x /(1 + x ( - 1)) Eq. 4-8 (13-3) (13-4) (13-5) (13-6) Single-stage batch still 28420: Separation Process Principles - Lecture 9 (2009) 2
Example 13.1: Given – initial charge of liquid (W 0 =100 kmol); 50% benzene (x 0 = 0.5) & 50% Toluene; V = 10 kmol/h; B-T = 2.41 at P = 101.3 kPa (1 atm); t 0 = 0 Solution: Use Eq. 13-5 where x 0 , W 0 , B-T are given; select a step-size x = 0.05; therefore, x = x 0 - x ; solving Eq. 13-5 gives W Use the calculated value of W to find time t; note that, ince dW/dt = Since dW/dt -V, Time = t – t 0 = (W 0 –W)/V Create table of t, W, x & T 28420: Separation Process Principles - Lecture 9 (2009) 3

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Example 13.2 Solution Steps: or x = x - , se iven For x x 0 x, use given equilibrium relation to obtain corresponding y Calculate 1/(y – x) Plot 1/(y – x) versus x Find the area under x 0 to x k Calculate W k Set , x 0 = x k and repeat until x end is reached 28420: Separation Process Principles - Lecture 9 (2009) 4
Example 13.2: Solution 5 28420: Separation Process Principles - Lecture 9 (2009)

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Batch Rectification – Use batch distillation for separation Multi-component charge mixture needs to be separated into different products (cut 1, 2, ….) Figure 13.3 28420: Separation Process Principles - Lecture 9 (2009) 6
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

Page1 / 20

c28420-lecture9-2009 - Course 28420 Lecture 9 28420 Topics...

This preview shows document pages 1 - 7. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online