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Chemical Reaction Kinetics Tasks

1. The document contains instructions for homework assignments in chemical engineering. It lists 9 problems to solve relating to reaction kinetics, determining rate laws and constants, and deriving rate equations based on reaction mechanisms. 2. The homework is due on February 18th and 20th for two sections and should be completed before class. 3. The problems involve experimental data, proposed reaction mechanisms, determining rate laws and constants from data, and deriving rate equations from mechanisms.

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423 views9 pages

Chemical Reaction Kinetics Tasks

1. The document contains instructions for homework assignments in chemical engineering. It lists 9 problems to solve relating to reaction kinetics, determining rate laws and constants, and deriving rate equations based on reaction mechanisms. 2. The homework is due on February 18th and 20th for two sections and should be completed before class. 3. The problems involve experimental data, proposed reaction mechanisms, determining rate laws and constants from data, and deriving rate equations from mechanisms.

Uploaded by

Agitha
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Homework 1

Dikumpulkan pada:
CE-1: 18 Februari 2020
CE-2: 20 Februari 2020
Sebelum Perkuliahan dimulai
1. The following data were obtained at o
70 C for the equilibrium adsorption of n-hexane
on silica gel particles

Partial pressure of C6H14 adsorbed, g


C6H14 in gas, atm moles/(g gel)
0.002 10.5 x 10-5
0.004 16.0 x 10-5
0.008 27.2 x 10-5
0.0113 34.6 x 10-5
0.0156 43.0 x 10-5
0.0206 47.3 x 10-5

a) Determine weather the adsorption process follow molecular or dissociative


adsorption process
b) Determine the constants value by least square
2. A. Peloso et al. [Can. J. Chem. Eng. 57 (1979) 159] investigated the kinetics of the
following reaction over a CuO/Cr2O3/SiO2 catalyst at temperatures of 225 – 285 C:o

𝑃𝐴𝑑 𝑃𝐷𝐻
𝑘 𝑃𝐸𝑡 −
𝐾𝑒
A possible rate law to describe the data is: 𝑟= 2
1 + 𝐾𝐸𝑡 𝑃𝐸𝑡 + 𝐾𝐴𝑑 𝑃𝐴𝑑

Write a reaction mechanism that would give this rate expression.


3. Derive the rate law for below mechanism:

4. Derive the rate law for below mechanism:


5. The dehydration butanol of alumina is carried out over a silica-alumina catalyst at
680 K.

𝑘𝑃𝐵𝑢
The rate law is: −𝑟𝐵𝑢 ′ = 2
1 + 𝐾𝐵𝑢 𝑃𝐵𝑢

With k=0.053 mol/gcat.h.atm and KBu = 0.33 -1


atm .
Pure butanol enters a thin tubed,
packed bed reactor at a molar flow rate of 50 kmol/hr and a pressure of 10 atm.
a. What PBR catalyst weight is necessary to achieve 80% conversion in the
absence of pressure drop?
b. When there is pressure drop, with 𝛼 = 0.0006 kg-1. What catalyst weight is
necessary to achieve 70% conversion?
6. Develop kinetic rate equation based on LHHW dual-site surface reaction for the
dehydrogenation of methylcyclohexane
7.

𝒓𝒆𝒂𝒄𝒕𝒊𝒐𝒏 𝒓𝒂𝒕𝒆
Run PA (atm) PB (atm) PC (atm) 𝒎𝒐𝒍
𝒔. 𝒈 − 𝒄𝒂𝒕
1 1 1 2 0.115
2 1 10 2 1.142
3 10 1 2 0.181
4 1 20 2 2.272
5 1 20 10 0.927
6 20 1 2 0.185
7 0.1 1 2 0.0242

(d)
8.

𝒎𝒐𝒍 𝒕𝒐𝒍𝒖𝒆𝒏𝒆
PH2 (atm) PM (atm) 𝒓′𝑻
𝒔. 𝒌𝒈 − 𝒄𝒂𝒕
1 1 1.21
1.5 1 1.251
0.5 1 1.30
0.5 0.5 1.1
1 0.25 0.92
0.5 0.1 0.64
3 3 1.27
1 4 1.28
3 2 1.26
4 1 1.30
0.5 0.25 0.94
2 0.05 0.41
9.

𝒓𝒆𝒂𝒄𝒕𝒊𝒐𝒏 𝒓𝒂𝒕𝒆
Pcyclohexanol Pcyclohexene Pwater 𝒎𝒐𝒍
Run
(atm) (atm) (atm) 𝒙𝟏𝟎𝟓
𝒔. 𝒅𝒎𝟑
1 1 1 1 3.31
2 5 1 1 1.051
3 10 1 1 0.566
4 2 5 1 1.827
5 2 10 1 1.491
6 3 0 5 1.361
7 3 0 10 1.081
8 1 10 10 0.863
9 0 5 8 0
10 3 3 3 1.372

(c)

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