Docsity
Docsity
Prepare for your exams
Prepare for your exams

Study with the several resources on Docsity

Earn points to download
Earn points to download

Earn points by helping other students or get them with a premium plan

Guidelines and tips
Guidelines and tips
Sell on Docsity
Sell on Docsity
Docsity AI
Docsity AI
Log inSign up

Prepare for your exams

Study with the several resources on Docsity

Find documents

Prepare for your exams with the study notes shared by other students like you on Docsity

Search for your university

Find the specific documents for your university's exams

Docsity AINEW

Summarize your documents, ask them questions, convert them into quizzes and concept maps

Explore questions

Clear up your doubts by reading the answers to questions asked by your fellow students

Earn points to download

Earn points by helping other students or get them with a premium plan

Share documents
download point icon20 Points

For each uploaded document

Answer questions
download point icon5 Points

For each given answer (max 1 per day)

All the ways to get free points
Get points immediately

Choose a premium plan with all the points you need

Study Opportunities

Choose your next study program

Get in touch with the best universities in the world. Search through thousands of universities and official partners

Community

Ask the community

Ask the community for help and clear up your study doubts

Free resources

Our save-the-student-ebooks!

Download our free guides on studying techniques, anxiety management strategies, and thesis advice from Docsity tutors

Dew Points - Chemical Process Principles - Lecture Slides, Slides of Chemical Processes

Aligarh Muslim UniversityChemical Processes

Objectives of this course are: (1)Learn about what Chemical Engineers do (2) Learn about basic chemical process units (3) Learn to analyze and solve material balance and energy balance problems. This handout includes: Dew Points, Multicomponent Vapor-Liquid Equilibrium, Oil Refining, Distillation Column Trays, Distillation Column, Henry's Law, Vapor-Liquid Equilibrium, Flash Calculation, Multicomponent Logic Chart, Partial Condenser

Typology: Slides

2012/2013

Uploaded on 08/30/2013

baga.baber
baga.baber 🇮🇳

4.4

(38)

100 documents

1 / 3

Toggle sidebar

This page cannot be seen from the preview

Don't miss anything!

bg1
1
Class 20
Multicomponent Vapor-Liquid Equilibrium
• Why Multicomponent?
• Review Raoult’s Law
• Henry’s Law
• Dew Point Calculation
• Bubble Point Calculation
• Flash Calculation
alkylation
FCC
reforming
Hydro-
processing
gasoline
diesel fuel
heating oil
lubricants
coke
C2 –C
8
C5 –C
9
C10 –C
16
C14 –C
20
C∞
light alkanes
<400 ۫
◌°C
400-500 ۫
◌°
450-550 ۫
◌°
>550 ۫
◌°C
naphtha
gas oil
heavy oil
crude
oil
petrochemicals
C8 –C
12
gases Oil Refining
Distillation Column
Distillation Column Trays
• On each tray, mixing is
high enough to approach
vapor-liquid equilibrium
• Vapor is enriched in more
volatile component
• Liquid is enriched in less
volatile component
• Multiple trays used to
achieve greater
separation yields
http://www.britannica.com/eb/art/print?id=53785&articleTypeId=0
Trays in Distillation Column
pf3

Partial preview of the text

Download Dew Points - Chemical Process Principles - Lecture Slides and more Slides Chemical Processes in PDF only on Docsity!

Class 20

Multicomponent Vapor-Liquid Equilibrium

• Why Multicomponent?

• Review Raoult’s Law

• Henry’s Law

• Dew Point Calculation

• Bubble Point Calculation

• Flash Calculation

alkylation

FCC

reforming

Hydro- processing

gasoline

diesel fuel

heating oil

lubricants

coke

C 2 – C 8

C 5 – C 9

C 10 – C 16

C 14 – C 20

C∞

light alkanes <400◌ ۫°C

>550◌ ۫°C

naphtha

gas oil

heavy oil

crude oil

petrochemicals

C 8 – C 12

gases

Oil Refining

Distillation Column

Distillation Column Trays

  • On each tray, mixing is

high enough to approach

vapor-liquid equilibrium

  • Vapor is enriched in more

volatile component

  • Liquid is enriched in less

volatile component

  • Multiple trays used to

achieve greater

separation yields

http://www.britannica.com/eb/art/print?id=53785&articleTypeId=

Trays in Distillation Column

Henry’s Law

• Raoult’s Law when

xi  1

  • Pi = xi Pi*

• Henry’s Law used

when x i  0

  • Pi = xi H (^) i
  • H (^) i is Henry’s Law

constant

  • H (^) i = f (T)
  • Tables available, but

not in our book

(from Wikipedia)

Example

on whiteboard

Terms you should know

• VLE

  • Vapor-liquid equilibrium

• Bubble point calculation

  • Any VLE calculation where xi is known
  • T or P known, find yi and P or T

• Dew point calculation

  • Any VLE calculation where yi is known
  • T or P known, find xi and P or T

• Flash calculation

  • VLE calculation where feed composition (z (^) i) is known

along with T and P tot of output

  • Need to find xi’s, yi’s, and L and V

• x i known (bubble point calculation)

  • If Ptot given, guess T to satisfy Ptot = xiPi*
  • If T given, get Ptot = xiPi*
  • Then yi = xiPi*/Ptot

• yi known (dew point calculation)

  • Use relation: xi = 1
  • If Ptot given, guess T to satisfy
  • If T given, get
  • Then yi = xiPi*/Ptot

Multicomponent Vapor-Liquid

Equilibrium (VLE)

 * ^1

i

itot

P

yP

i

i

tot

P

y

P

Write in book!

Page 259

vapor F (known) zi (known)

V (unknown) yi (unknown)

L (unknown) xi (unknown)

P & T known

liquid

Flash Calculation

Or P known and yi known

Flash Calculation

• z i known, 2 species, P&T known

  • Raoult’s law for each species
    • y 1 P (^) tot = x 1 P 1 *
    • (1-y 1 )P (^) tot = (1-x 1 )P 2 *
    • Add these equations to get: P (^) tot = x 1 P 1 *+ (1-x 1 )P 2 *
    • Solve for x 1
    • Get y 1 = x 1 P 1 */P (^) tot
  • Mole balances
    • F = V + L
    • z 1 F = y 1 V + x 1 L
    • 2 equations, 2 unknowns (V & L)

• z i known, multiple species  complicated