Collection and Analysis of Rate Data

Slides:

Advertisements

Similar presentations

Chemical Reaction Engineering (CRE) is the field that studies the rates and mechanisms of chemical reactions and the design of the reactors in which they.

Advertisements

Topics to be covered in this module

Chemical Reaction Engineering

Conversion and Reactor Sizing

© 2014 Carl Lund, all rights reserved A First Course on Kinetics and Reaction Engineering Class 15.

Chemical Reaction Engineering Asynchronous Video Series Chapter 5: Finding the Rate Law H. Scott Fogler, Ph.D.

Rate Laws Example: Determine the rate law for the following reaction given the data below. H 2 O 2 (aq) + 3 I - (aq) + 2H + (aq)  I 3 - (aq) + H 2 O (l)

Chemical Reaction Engineering (CRE) is the field that studies the rates and mechanisms of chemical reactions and the design of the reactors in which they.

Lecture 1 Chemical Reaction Engineering (CRE) is the field that studies the rates and mechanisms of chemical reactions and the design of the reactors.

Chemical Reaction Engineering (CRE) is the field that studies the rates and mechanisms of chemical reactions and the design of the reactors in which they.

Chemical Reaction Engineering (CRE) is the field that studies the rates and mechanisms of chemical reactions and the design of the reactors in which they.

Chemical Reaction Engineering (CRE) is the field that studies the rates and mechanisms of chemical reactions and the design of the reactors in which they.

Lecture 18 Chemical Reaction Engineering (CRE) is the field that studies the rates and mechanisms of chemical reactions and the design of the reactors.

Lecture 11 Thursday 2/7/08 Determining the Rate Law from Experimental Data Integral Method Graphical Method Nonlinear Least Regression Multiple Reactions.

Lecture18 Thursday 3/13/08 Solution to Tuesdays In-class Problem. User Friendly Energy Balance Derivations Adiabatic (Tuesday’s lecture). Heat Exchange.

Chemical Reaction Engineering (CRE) is the field that studies the rates and mechanisms of chemical reactions and the design of the reactors in which they.

Chemical Reaction Engineering (CRE) is the field that studies the rates and mechanisms of chemical reactions and the design of the reactors in which they.

General Mole Balance Equation Batch

Lecture 11 Chemical Reaction Engineering (CRE) is the field that studies the rates and mechanisms of chemical reactions and the design of the reactors.

Lecture 11 Chemical Reaction Engineering (CRE) is the field that studies the rates and mechanisms of chemical reactions and the design of the reactors.

Chemical Reaction Engineering (CRE) is the field that studies the rates and mechanisms of chemical reactions and the design of the reactors in which they.

ISOTHERMAL REACTOR DESIGN

Lecture 8 Chemical Reaction Engineering (CRE) is the field that studies the rates and mechanisms of chemical reactions and the design of the reactors.

Chemical Reaction Engineering (CRE) is the field that studies the rates and mechanisms of chemical reactions and the design of the reactors in which they.

Chemical Reaction Engineering Asynchronous Video Series Chapter 4, Part 1: Applying the Algorithm to a CSTR H. Scott Fogler, Ph.D.

L8-1 Slides courtesy of Prof M L Kraft, Chemical & Biomolecular Engr Dept, University of Illinois, Urbana-Champaign. Review: Pressure Drop in PBRs A →

ERT 316 R EACTION E NGINEERING C HAPTER 5: C OLLECTION AND A NALYSIS OF R ATE D ATA BY ANIS ATIKAH AHMAD.

Chemical Reaction Engineering Asynchronous Video Series Chapter 1: General Mole Balance Equation Applied to Batch Reactors, CSTRs, PFRs, and PBRs H. Scott.

Chemical Reaction Engineering Chapter 4, Part 3: Pressure Drop in a Packed Bed Reactor.

Collection and Analysis of Rate Data

Review: Logic of Isothermal Reactor Design

Chemical Reaction Engineering Lecture (1) Week 2.

Collection and Analysis of Rate Data Dr. A.K.M. Shafiqul Islam.

Chemical Reaction Engineering (CRE) is the field that studies the rates and mechanisms of chemical reactions and the design of the reactors in which they.

L15-1 Slides courtesy of Prof M L Kraft, Chemical & Biomolecular Engr Dept, University of Illinois, Urbana-Champaign. L15: Nonisothermal Reactor Example.

07 Oct 2011Prof. R. Shanthini1 Cellular kinetics and associated reactor design: Reactor Design for Cell Growth CP504 – Lecture 7.

Lecture 6 Chemical Reaction Engineering (CRE) is the field that studies the rates and mechanisms of chemical reactions and the design of the reactors.

Conversion and Reactor Sizing Lec 4 week 4. Definition of Conversion for the following reaction The reaction can be arranged as follows: how far the above.

Chemical Reaction Engineering (CRE) is the field that studies the rates and mechanisms of chemical reactions and the design of the reactors in which they.

Lecture 8 Chemical Reaction Engineering (CRE) is the field that studies the rates and mechanisms of chemical reactions and the design of the reactors.

Isothermal reactor design

ERT 316 R EACTION E NGINEERING C HAPTER 5: C OLLECTION AND A NALYSIS OF R ATE D ATA BY ANIS ATIKAH AHMAD.

T 1/2 : Half Life Chemical Kinetics-6. Can be derived from integrated rate law.

Chemical Reaction Engineering (CRE) is the field that studies the rates and mechanisms of chemical reactions and the design of the reactors in which they.

ChE 402: Chemical Reaction Engineering

Differential Equations

T1/2: Half Life Chemical Kinetics-6.

Lecture 11 Chemical Reaction Engineering (CRE) is the field that studies the rates and mechanisms of chemical reactions and the design of the reactors.

CSTR in series and in parallel

The Changes of Concentration with Time

Chemical Reaction Engineering

Lecture 5 Chemical Reaction Engineering (CRE) is the field that studies the rates and mechanisms of chemical reactions and the design of the reactors.

Lecture 5 Chemical Reaction Engineering (CRE) is the field that studies the rates and mechanisms of chemical reactions and the design of the reactors.

Lecture 11 Chemical Reaction Engineering (CRE) is the field that studies the rates and mechanisms of chemical reactions and the design of the reactors.

Lecture 4 Chemical Reaction Engineering (CRE) is the field that studies the rates and mechanisms of chemical reactions and the design of the reactors.

Lecture 7 Chemical Reaction Engineering (CRE) is the field that studies the rates and mechanisms of chemical reactions and the design of the reactors.

Lecture 13 Chemical Reaction Engineering (CRE) is the field that studies the rates and mechanisms of chemical reactions and the design of the reactors.

ISOTHERMAL REACTOR DESIGN

Lecture 7 Chemical Reaction Engineering (CRE) is the field that studies the rates and mechanisms of chemical reactions and the design of the reactors.

Lecture 5 Chemical Reaction Engineering (CRE) is the field that studies the rates and mechanisms of chemical reactions and the design of the reactors.

Calculation Session 1 Lecture 2:

CHAPTER Five: Collection & Analysis of Rate Data

Lecture 6 Chemical Reaction Engineering (CRE) is the field that studies the rates and mechanisms of chemical reactions and the design of the reactors.

Lecture 11 Chemical Reaction Engineering (CRE) is the field that studies the rates and mechanisms of chemical reactions and the design of the reactors.

Lecture 4 Chemical Reaction Engineering (CRE) is the field that studies the rates and mechanisms of chemical reactions and the design of the reactors.

Multiple Reactions Chapter 6.

Lecture 6 Chemical Reaction Engineering (CRE) is the field that studies the rates and mechanisms of chemical reactions and the design of the reactors.

Lecture 7 Chemical Reaction Engineering (CRE) is the field that studies the rates and mechanisms of chemical reactions and the design of the reactors.

Chemical Reaction Engineering

Presentation transcript:

Collection and Analysis of Rate Data

Determining the Rate Law Example: Reaction of triphenyl methyl chloride (trityl) (A) and methanol (B) A + B  C + D was carried out in a solution of bezene and pyridine at 25OC. Pyridine reacts with HCl that then precipitates as pyridine hydrochloride thereby making the reaction irreversible. The concentration-time data in Table was obtained as in a batch reactor At t=0, CA = 0.05M) Time (min 50 100 150 200 250 300 Concentration of A (mole/dm3) X 38 30.6 25.6 22.2 19.5 17.4

The initial concentration of methanol was 0.5 mole/dm3 Part (1): Determine the reaction with respect to triphenyll methyl chloride. Part (2): In a separate set of reaction the reaction order wrt methanol was found to be first order. Determine the specific reaction constant

Solution Part (1) Find the reaction order wrt trityl. Step 1 Postulate rate law Step 2 Process your data in terms of the measured variables, which in this case is CA Step 3 Look for simplification. Concentration of methanol is 10 times the initial concentration of triphenyl methyl chloride, its concentration is essentially constant. CB = CB0

Substituting CB in equation Where Step 4 Apply the CRE algorithm Mole balance Rate Law

V = V0 Stoichiometry: Liquid Combine: mole balance, rate law and stoichiometry Taking the natural log on both sides of equation

Slope of vs will yield reaction order a Slope of vs will yield reaction order a with respect to triphenyl methyl chloride (A). Step 5 Find as a function of CA from the concentration-time data.

could be find in three ways Graphical Method Finite Differential Method Polynomial Method

Graphical Method t (min) CAx103 (mol/dm3) (mol/dm3 - min) 50 3.0 2.40 50 3.0 2.40 38 1.86 1.48 100 30.6 1.20 1.00 150 25.6 0.80 0.68 200 22.2 0.50 0.54 250 19.5 0.47 0.42 300 17.4

Graphical Method The derivative –dCA/dt is determined by calculating and plotting (-DCA/Dt) as a function of time, t, and using differential technique (Appendix A.2) to determine (-dCA/dt) as a function of CA.

Graphical Method First calculate the ratio (-DCA/Dt) from the first two columns of the Table. The result is written the third column Next plot the third column as a function of first column. i.e., (-DCA/Dt) versus t. Using the equal-area differentiation, the value of (-dCA/dt) is read off the figure. The value is put in the fourth column of the Table.

Graphical Method

Graphical Method

Finite Difference Method

Summary Table Graphical Finite Difference t (min) (mol/dm3-min) (mol/dm3) 3.0 2.86 50 1.86 1.94 38 100 1.20 1.24 30.6 150 0.80 0.84 25.6 200 0.68 0.61 22.2 250 0.54 0.48 19.5 300 0.42 0.36 17.4

Plot column 2 and 3 ( ) as a function of column 4 (CA X 1,000) on log scale. We could substitute parameter values into Excel to find  and k’.

To evaluate k’ we can derivative and CAP=0.5X10-3 mol/dm3, which is Then

Excel Plot

Excel Plot Graphical method Slope = 2.05 Finite Difference Method The reaction is consider as Second order