Penguapan Pengembunan 5 2

8/20/2019 Penguapan Pengembunan 5 2

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Penguapan-pengembunan


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Kesetimbangan materi

• Komposisi ---------- tekanan parsial

• Diketahui tititk embun air dalam gas Tekanan parsial uap air

dalam gas

• Gas jenuh didinginkan pada tekanan tetap, fraksi mol uap air dan

gas tetap konstan sampai tercapai titik embun, pada pendinginan

selanjutnya semakin banyak air yang mengembun. Pada saatpendinginan dihentikan , gas tersebut masih jenuh dengan titik

embunnya yang baru

P!G"#!G

$D%"% &%'%(

K%)$ K"#!G

$D%"% P*+&%&

K%)$ &%'%(


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#nput output

• +assain . +olfraksiin % +assaout . +olfraksiout %

• +assain . Pi/P in % +assaout . Pi/P out %


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0ontoh-1

• %ir saturated 2ith 2ater 3apor at 4567 and 89:.5 mm (gabs. is passed through an air compressor and thenstored in a tank at ;:.5 psig and 4567.


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Step 5 'e3eral basis can be considered> 7 155 lb mol, P 155 lb mol,

< 155 lb mol, 7 89: lb mol, and so on, but 2e 2ill take

a tie component as a con3enient basis

&asis> 7 1.55 lb mol


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0ontoh-;

• Toluene is e3aporated into dry air. The

resulting mi?ture at 9560 and a pressure

of 151.@kPa has a percentage saturation

of :5A. #t is desired to condense 45A of

the toluene in the mi?ture by a process ofcooling and compressing. #f the

temperature is reduced to :60, determine

the pressure to 2hich gas must becompressed.


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0ontoh-@

• % constant-3olume 3essel contains dry air atBB67 and ;1.; psia. Cne pound of liuid 2ateris introduced into the 3essel. The 3essel isthen heated to a constant temperature of14567. %fter euilibrium is reached, the

pressure in the 3essel is @1.5 psia. The 3aporpressure of 2ater at 14567 is 8.:1 psia.• a. Did all of the 2ater e3aporate=• b. 0ompute the 3olume of the 3essel in cubic

feet.• c. 0ompute the humidity of the air in the3essel at the final conditions in pounds of2ater per pound of air.


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0ontoh-9

• % silica gel drier remo3es 1555 kg of 2ater

per hour. %ir is supplied at a temperature

of ::60 and a de2 point of ;B.:60. The air

lea3es the drier at a temperature of @;60

and a de2 point of 8.;60. The pressure in

the system is constant at 155.5 kPa.

0alculate the 3olume of the 2et air at theinitial conditions 2hich is supplied per

hour.


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?ercise

% 1555 kg batch of a pharmaceutical

po2der containing : A by 2t 2ater is

dried in a double cone drier. %fter drying

E5 A of the 2ater has been remo3ed.0alculate the final batch composition and

the 2eight of 2ater remo3ed.

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Penguapan Pengembunan 5 2