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Mass transfer with or without chemical reaction
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CALCULATIONS

 

 

CASE 1: TO FIND THE ENHANCEMENT FACTOR WHEN BENZOIC ACID IS DISSOLVED IN 1.5 L of 0.5N NaOH FOR A DURATION OF 10 MINUTES .

 

BEFORE EXPERIMENT

 

Outer diameter of the benzoic acid cylinder = 3.4 cm

Length of the benzoic acid cylinder = 4.9 cm

 

AFTER EXPERIMENT

 

Outer diameter of the benzoic acid cylinder = 2.75 cm

Length of the benzoic acid cylinder = 4.01 cm

Normality of HCL used for titration (N1) = 0.5 N

Volume of 0.5 N HCL used (V1) = 9.4 ml

Volume of NaOH taken (V2) = 10 ml

Let the normality of unused NaOH in dissolution be N2

N1V1 = N2V2

 N2 =N1V1 /V2

  =0.47 N

 

The concentration of unused NaOH = 0.47 N

The rate of dissolution of benzoic acid = R

 

R = N2*Volume of NaOH soln in tank

=1.175 *10^(-6) kmol/sec

 

Let the average dimensions of benzoic acid cylinder be

Dav = (3.4 + 2.75 )/2

= 3.075 cm

Lav = (4.9 + 4.01)/2

= 4.455 cm

 

Let S.S rod diameter d = 0.78 cm

Average surface area (AS)

 

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= 56.9*10(-4) m2

 

Specific rate of dissolution R'

 

«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«msup»«mi mathvariant=¨bold¨»R«/mi»«mo»§apos;«/mo»«/msup»«mo»§nbsp;«/mo»«mo»=«/mo»«mo»§nbsp;«/mo»«mfenced»«mfrac»«mi mathvariant=¨bold¨»R«/mi»«msub»«mi mathvariant=¨bold¨»A«/mi»«mi mathvariant=¨bold¨»S«/mi»«/msub»«/mfrac»«/mfenced»«/math»

= 2.1* 10(-4) kmol/m2 - sec

 

 

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