Tgas SOAL Trk 1 Ex 4-6

8/11/2019 Tgas SOAL Trk 1 Ex 4-6

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Tugas Teknik Reaksi

Kimia INama : Wahyu

Faiz

Jenial S

Afrielyanda H

Rafli

Juni Irwanda1


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Example 4-6

Approximately 7 billion pounds of ethylene oxide were produced

in he United States in 1997. The 1997 selling price was $0.58 a

pound, amounting to a commercial value of $4.0 billion. Over 60%of the ethylene oxide produced is used to make ethylene glycol.

The major end uses of ethylene oxide are antifreeze (30%).

Polyester (30%), surfactants (10%), and solvents (5%). We want to

calculate the catalyst weight necessary to achieve 60% conversion

when ethylene oxide is to be made by the vapor-phase catalytic

oxidation of ethylene with air

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Ethylene and oxygen are fed in stoichiometric proportions to a

packed-bed reactor operated isothermally at 260oC. Ethylene is fed

at a rate of 0.30 Ib mol /s at a pressure of 10 atm. It is proposed to

use 10 banks of 1 -in.-diameter schedule 40 tubes packed with

catalyst with 100 tubes per bank. Consequently, the molar flow

rate to each tube is to be 3 X 10-4mol/s. The properties of the

reacting fluid are to be considered identical to hose of air at this

temperature and pressure. The density of the -in.-catalyst

particles is 120 Ib/ft3

and the bed void fraction is 0.45. The ratelaw is

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3. Stoichiometry

Gas-phase, isotermal v = vo

(1+X)(Po

/P)

=

=

( )

+

=

+

Dimana =

=

=

( /)

+

Untuk stoikiometri umpan = =

=

( )

+

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Untuk kerja secara isotermal

4. Kombinasikan persamaan laju reaksi dan konsentrasi

Karena (1/2)2/3=0.63

Dan

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MakarAmenjadi :

Dimana

5. Parameter evaluation per tube

Etilen :

Oksigen :

Inert (I)=N2 :

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Menghasilkan :

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y = (1 )/

=1 (1 1.303/)

/

Maka,

Dimana,

-rA = FA0

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Orde reaksi

Dibutuhkan nilai o, Ac, c, dan Po

Acuntuk 1 in pipa schedule 40 = 0,01414 lb/h.ft2

Dp = 0,0208 ft = 0,45

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Dibutuhkan nilai G

mTOadalah laju alir masa total

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Jadi G =

Untuk udara pada 260oC dan 10 atm

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Nilai odikonversi menjadi :

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Setelah o di dapat, di tentukan nilai

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Jadi katalis yang dibutuhkan per tabung :

=

1 (1 1.303/)/

=

1 (1 1.303

0,0166.

1,08 .

0,0266

.

)/

0,0166

= 45,4 lb katalis /tabung

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Berat katalis per tabung tanpa

pressure drop

= 35,3 lb katalis per tabung

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Tgas SOAL Trk 1 Ex 4-6

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