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Residence time distibution

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Presentation Transcript
content page

CONTENT PAGE

Introduction

Background

Literature review

Apparatus

Experimental procedure

Results

Discussion

Error Analysis

Conclusion

Recommendations

introduction

INTRODUCTION

Task

Determine which reactor is most efficient to be used in Professor Van Steen research group project

AIM

Use tracer studies to determine the mixing characteristics of the reactors.

Use the Dispersion and Tank-In-Series model to describe how the reactors deviate from ideality.

Investigate the performance of PFR,PBR and CSTR using the given reaction data.

background

BACKGROUND

Flow reactors are typically designed under the assumption that the flow pattern within the reactor is ideal.

Residence time is the average time that the species spend in a reactor.

tracer selection
TRACER SELECTION
  • RTD is determined experimentally by injecting an inert chemical (Tracer) into the reactor.
  • The tracer should:
  • Nonreactive species that is easily detectable
  • Have physical properties similar to those of the reacting mixture
  • Be completely soluble in the mixture.
  • The most used methods of injection are pulse input and step input.
  • Tracer used in this practical is Potassium Chloride solution (KCl)
ideal behaviour

IDEAL BEHAVIOUR

CSTR

Normally operated at steady state and is assumed to be perfectly mixed

Every variable is the same at every point within the reactor.

In cases where mixing is highly non-ideal, the well-mixed model is inadequate.

PFR

Operated at steady and no back- mixing occurs within the reactor.

Concentration varies continuously in the axial direction through the reactor.

There is no radial variation in reaction rate.

PBR

Reaction occurs at the surface of the catalyst

non ideal behaviour

NON-IDEAL BEHAVIOUR

Dispersion model

The parameter used is the dispersion coefficient Da.

Dispersion coefficient 

Peclet number

2 tank in series model the parameter used in n i e the number of tanks
2. Tank-In-Series model

The parameter used in n, i.e. the number of tanks

apparatus

APPARATUS

A plug flow reactor

A packed bed reactor

Stirred tank reactor

Rotameter

Stop watch

Tracer (Potassium chloride solution)

Syringe

Conductivity meter coupled to PC