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Chemical Reaction Lab Report

This document describes a laboratory experiment using a tubular reactor to determine reaction conversion and rate constant under steady state conditions. The experiment involves reacting sodium hydroxide and ethyl acetate in a continuous stirred tank reactor maintained at 30°C. Samples are taken over time and conductivity is measured to calculate conversion. Once steady state is reached after 20 minutes, the conversion is calculated to be 51.2% and the rate constant is calculated to be 0.1739 dm3/mol.sec. The objective was to determine these values experimentally for a second order reaction under steady state conditions in a tubular reactor.

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62 views6 pages

Chemical Reaction Lab Report

This document describes a laboratory experiment using a tubular reactor to determine reaction conversion and rate constant under steady state conditions. The experiment involves reacting sodium hydroxide and ethyl acetate in a continuous stirred tank reactor maintained at 30°C. Samples are taken over time and conductivity is measured to calculate conversion. Once steady state is reached after 20 minutes, the conversion is calculated to be 51.2% and the rate constant is calculated to be 0.1739 dm3/mol.sec. The objective was to determine these values experimentally for a second order reaction under steady state conditions in a tubular reactor.

Uploaded by

عبدالحكيم حثول
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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CHE 322 Chemical Reaction Engineering Laboratory

KING KHALID UNIVERSITY


COLLEGE OF ENGINEERING
DEPARTMENT OF CHEMICAL ENGINEERING

Laboratory Report for

CHEMICAL REACTION ENGINEERING

EXPERIMENT NUMBER:4

TUBULAR REACTOR- STEADY STATE CONDITIONS

Submitted by

NAME OF THE STUDENT ABDULHAKEM AHMAD

UNIVERSITY ID NUMBER: 4 3 8 8 0 1 7 8 5

Student Signature

REMARKS: Instructor Signature


CHE 322 Chemical Reaction Engineering Laboratory

OBJECTIVE: To determine reaction conversion and specific rate constant using a tubular
reactor under steady state conditions.

EQUIPMENT NEEDED: Reactor service unit, tubular reactor

TEHORY :

The rate expression can be shown to be ra = k.a.b

Where if aµ is equal to bµ this simplies to ra = k. a2

In general case, the order of the reaction is not known and is shown by

ra = k . an

Ther reaction :

NaOH + CH3COOC2H5 → CH3COONa + C2H5OH

Can be considered equi-molar and first order with respect to both sodium hydroxide and ethyl
acetate i.e. second order overall, within the limits of concentration (0.1 M) and temperature ( 20-
40 oC) studied.

The reaction carried out in a continuous stirred tank reactor or Tubular reactor eventually reaches
steady state when a certain amount of conversion of starting reagents has taken place. The
steady-state conditions will vary depending on the concentration of reagents, flow rate, volume
of reactor and temperature of reaction
CHE 322 Chemical Reaction Engineering Laboratory
CHE 322 Chemical Reaction Engineering Laboratory

PROCEDURE :

1. Make 3.0 L batches of 0.1 M sodium hydroxide and 0.1 M ethyl acetate.
2. Adjust the set point temperature controller to 30 0C.
3. Use the calibration graph for each pumps, set the pump speed control to give 50 ml/min
flow rate for each reactant.
4. Set hot water circulator.
5. Collection of date will be until a steady state condition reached in the reactor.

OBSERVATION AND CALCULATION:

Volumetric feed rate of NaOH, Fa = 50 ml/min = 0.00083 dm3/s

Volumetric feed rate of CH3COOC2H5= 50 ml/min = ------ dm3/s

NaOH concentration in feed vessel, aμ = 0.1 M= mol/dm3

CH3COOC2H5 concentration in feed vessel bμ =0.1M = mol/dm3

Temperature of reactor = 30 0C

Volume of reactor V= 0.41 L

No. Time t(min) Conductivity Conversion, Rate Constant


Λt (mS) Xa k (dm3/mol.sec)

1 0 8.39

2 5 8.22

3 10 8.19

4 15 7.91

5 20 7.80

6 25 7.79 51.2% 0.1739

Calculate conversion XA and reaction rate constant k at steady state conditions


CHE 322 Chemical Reaction Engineering Laboratory

=0.05mol/
dm^3

=0.004394S

=0.01136S

=0.02437MOL/DM^3

=0.512 =51.2%

=0.1739DM^3/
MOL.S
CHE 322 Chemical Reaction Engineering Laboratory

RESULTS AND CONCLUSION:

The conversion XA and reaction rate constant k for the given reaction are 0.512 and 0.1739
dm3/mol.sec respectively.

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