Download presentation

Presentation is loading. Please wait.

Published byMatthew Ashwood Modified over 2 years ago

1
PETE 310 Lectures # 6 & # 7 Phase Behavior – Pure Substances (Lecture # 5) Two Component Mixtures Three & Multicomponent Mixtures

2
Learning Objectives After completing this chapter you will be able to: Understand pure component phase behavior as a function of pressure, temperature, and molecular size. Understand the behavior of binary and multicomponent mixtures Behavior understood through proper interpretation of phase diagrams

3
Phase Diagrams Types of phase diagrams for a single component (pure substance) (PT) (PV) or (P ) (TV) or (T

4
Phase Diagrams Single Component Phase Diagram

5
Phase Diagrams Vapor Pressure Curve Pressure Temperature Vapor Liquid Critical Point l v P c T c

6
Hydrocarbon Families Physical Properties One point in the Vapor Pressure Curve

7
Pressure vs Specific Volume Pure Substance TcTc 2-phase T Specific Volume (ft 3 / lbm) Pressure ( psia ) V v V L CP

8
Tabulated critical properties (McCain) Pure Component Properties

9
Heat Effects Accompanying Phase Changes of Pure Substances Heat Effects Accompanying Phase Changes of Pure Substances Lv = T V dP v dT With V = V Mg -V Ml Btu/lb-mol Clapeyron equation

10
Heat Effects Accompanying Phase Changes of Pure Substances Heat Effects Accompanying Phase Changes of Pure Substances Lv = T V dP v dT = Approximate relation (Clausius - Clapeyron Equation) dP v dT RT 2 P v Lv

11
Example of Heat Effects Accompanying Phase Changes Steam flooding Problem: Calculate how many BTU/day (just from the latent heat of steam) are provided to a reservoir by injecting 6000 bbl/day of steam at 80% quality and at a T=462 o F Calculate how many BTU/day (just from the latent heat of steam) are provided to a reservoir by injecting 6000 bbl/day of steam at 80% quality and at a T=462 o F

12
COX - Vapor Pressure Charts (normal paraffins) Pressure Temperature heavier Non-linear scale Log scale

13
Determination of Fluid Properties Temperature of Test Constant V t1 V t2 V t3 = V b V t5 V t4 liquid gas Hg P 1 >> P s P 2 > P s P 3 = P s P 4 = P s P 5 =P s 12345 Ps =saturation pressure

14
Vapor Pressure Determination Pressure P S Volume V L T2T2T2T2 T1T1T1T1

15
Binary Mixtures Relationships to analyze: P, T, molar or specific volume or (molar or mass density) - as for a pure component – + COMPOSITION – Molar Composition

16
Hydrocarbon Composition The hydrocarbon composition may be expressed on a weight basis or on a molar basis (most common) Recall

17
Hydrocarbon Composition By convention liquid compositions (mole fractions) are indicated with an x and gas compositions with a y.

18
Our Systems of Concern Gas system Oil system open

19
A separator z i (T 1,P 1 ) x i (T 1,P 2 ) y i (T 1,P 2 ) P 1 > P 2 T 1,P 2

20
with In general Mathematical Relationships

21
Key Concepts Fraction of vapor (fv) Mole fractions in vapor (or gas) phase yi Mole fractions in liquid (or oil) phase xi Overall mole fractions (zi) combining gas & liquid

22
Phase Diagrams for Binary Mixtures Types of phase diagrams for a two- component mixture Most common (PT) zi at a fixed composition (Pzi) T at a fixed T (Tzi P at a fixed P (PV) zi or (P ) zi

23
Pressure vs Temperature Diagram (PT) zi CB CT CP Bubble Curve Dew Curve Pressure Temperature Liquid Gas 2 Phases Zi = fixed

24
Pressure Composition Diagrams - Binary Systems

25
Temperature vs. Composition Diagrams – Binary Systems Temperature Pressure Bubble Curve Dew Curve 2-phases x 1, y 1 PaPa PaPa CP 1 CP 2 T1sT1s T2sT2s T2sT2s T1sT1s 0 1

26
Gas-Liquid Relations z 1 =overall mole fraction of [1],y 1 =vapor mole fraction of [1],x 1 =liquid mole fraction of [1]

27
Supercritical Conditions Binary Mixture

28
Quantitative Phase Equilibrium Exercise

30
Ternary Diagrams: Review

31
Pressure Effect C3C3 C3C3 nC 5 C3C3 C1C1 Gas p=14.7 psia C1C1 nC 5 Gas 2-phase Liquid p=380 psia C3C3 nC 5 C1C1 C3C3 Gas 2-phase Liquid p=500 psia C1C1 Gas 2-phase Liquid nC 5 p=1500 psia 2-phase Liquid C1C1 nC 5 Gas p=2000 psia C1C1 nC 5 C3C3 Liquid p=2350 psia

32
Dilution Lines Ternary Diagrams: Review

33
Quantitative Representation of Phase Equilibria - Tie (or equilibrium) lines Tie lines join equilibrium conditions of the gas and liquid at a given pressure and temperature. Dew point curve gives the gas composition. Bubble point curve gives the liquid composition.

34
Ternary Diagrams: Review Quantitative Representation of Phase Equilibria - Tie (or equilibrium) lines All mixtures whose overall composition (z i ) is along a tie line have the SAME equilibrium gas (y i ) and liquid composition (x i ), but the relative amounts on a molar basis of gas and liquid (f v and f l ) change linearly (0 – vapor at B.P., 1 – liquid at B.P.).

35
Illustration of Phase Envelope and Tie Lines

36
Uses of Ternary Diagrams Representation of Multi-Component Phase Behavior with a Pseudoternary Diagram Ternary diagrams may approximate phase behavior of multi-component mixtures by grouping them into 3 pseudocomponents heavy (C 7 + ) intermediate (C 2 -C 6 ) light (C 1, CO 2, N 2 - C 1, CO 2 -C 2,...)

37
Uses of Ternary Diagrams Miscible Recovery Processes Solvent1 oil Solvent2

38
Exercise Find overall composition of mixture made with 100 moles oil "O" + 10 moles of mixture "A". __________________________________________________________________________________________________________________________________

39
Practice Ternary Diagrams Pressure Effect T=180F P=14.7 psia Pressure Effect O T=180F P=200 psia C1-C3-C10 Pressure Effect O T=180F P=400 psia Pressure Effect O T=180F P=600 psia Pressure Effect O

40
Practice Ternary Diagrams Pressure Effect T=180F P=1000 psia Pressure Effect O T=180F P=1500 psia Pressure Effect O T=180F P=2000 psia O T=180F P=3000 psia O T=180F P=4000 psia O

41
Practice Ternary Diagrams Temperature Effect T=100F P=2000 psia Temperature Effect O T=150F P=2000 psia Temperature Effect O T=200F P=2000 psia Temperature Effect O T=300F P=2000 psia Temperature Effect O

42
Practice Ternary Diagrams Temperature Effect T=350F P=2000 psia Temperature Effect O T=400F P=2000 psia Temperature Effect O T=450F P=2000 psia Temperature Effect O

43
Pressure-Temperature Diagram for Multicomponent Systems

44
Changes During Production and Injection Temperature t 1 Pressure t 3 t 2 Gas Injection Production t t 3 2 Gas Injection Production

45
Homework See Syllabus please

Similar presentations

OK

Noorulnajwa Diyana Yaacob PPK Bioproses Universiti Malaysia Perlis MULTIPHASE SYSTEM.

Noorulnajwa Diyana Yaacob PPK Bioproses Universiti Malaysia Perlis MULTIPHASE SYSTEM.

© 2017 SlidePlayer.com Inc.

All rights reserved.

Ads by Google

Ppt on holographic technology videos Jit ppt on manufacturing news Ppt on acute coronary syndrome protocol One act play ppt on apple Ppt on indian airline industry Scrolling message display ppt online Ppt on acid-base titration video Ppt on great mathematician of india Ppt on team building process Ppt on first conditional activity