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22che110-11 Diffusivity

The document presents data on the diffusivity of acetone, including Antoine coefficients for calculating vapor pressure and a formula for diffusivity in air. It provides experimental observations over time, detailing height changes and calculated diffusivity values. The average diffusivity of acetone in air is reported as 2.11E-04 m2/s, with additional parameters such as atmospheric pressure and temperature included.

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47 views4 pages

22che110-11 Diffusivity

The document presents data on the diffusivity of acetone, including Antoine coefficients for calculating vapor pressure and a formula for diffusivity in air. It provides experimental observations over time, detailing height changes and calculated diffusivity values. The average diffusivity of acetone in air is reported as 2.11E-04 m2/s, with additional parameters such as atmospheric pressure and temperature included.

Uploaded by

Parth
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as XLSX, PDF, TXT or read online on Scribd
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EXP-7 Diffusivity of acetone

Data:
Antoine coefficients for acetone: log10(Vapour pressure PA1) = A-B/(T+C)
A = 4.42448, B = 1312.253, C = -32.445 (Vapour pressure in bar, T in K)

𝑧(𝑡)2−𝑧02=2𝐷𝐴𝐵𝑃𝑀𝑊(𝑝𝐴1−𝑝𝐴2)𝑅𝑇𝑃𝐵𝐿𝑀𝜌𝑡
ρ= 784 kg/m3

𝑃𝐵𝐿𝑀 = (𝑃 − 𝑝𝐴2) − (𝑃 − 𝑝𝐴1)/𝑙𝑛 (𝑃 − 𝑝𝐴2/𝑃 − 𝑝𝐴1


MW= 5.81E-02 g/gmol
Patm=P= 101325 Pa
T= 298 K
From Literature, Diffusivity of Acetone in Air = 1.24E-05 m2/s

Observation Table:

Time(min) Height(m) zt2-z02(m2) DAB(m2/s) zt2-z02(m2) Time(min)


0 0.1105 0 0 0
5 0.111 0.00011075 1.67E-04 1.1075 5
10 0.111509 0.00022400708 0.0001686734 2.24007081 10
15 0.11251 0.0004482501 0.0002250164 4.482501 15
20 0.112651 0.0004799978 0.000180715 4.79997801 20
25 0.113568 0.00068744062 0.0002070523 6.87440624 25
30 0.114412 0.00087985574 0.0002208387 8.79855744 30
35 0.115014 0.0010179702 0.000219004 10.17970196 35
40 0.115516 0.00113369626 0.0002134134 11.33696256 40
45 0.116502 0.001362466 0.0002279807 13.62466004 45
50 0.117021 0.00148366444 0.0002234347 14.83664441 50
55 0.118026 0.00171988668 0.0002354627 17.19886676 55
60 0.119029 0.00195765284 0.0002456798 19.57652841 60
Davg = 2.11E-04

z(t)^2-z0^2 vs Time
25

20

15

10

0
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52

Time(min) Linear ( Time(min))


10

0
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52

Time(min) Linear ( Time(min))


pA1= 3.06E+04
PBLM= 8.38E+04
z0= 11.05

42 44 46 48 50 52 54 56 58 60 62

))
42 44 46 48 50 52 54 56 58 60 62

))

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