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T U TO R I A L 5 A S P E N T E A M X X I I I
Column
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Jenis-Jenis Kolom
1. DSTWU 5. Multifrac 2. Distil 6. SCFrac 3. Radfrac 7. PetroFrac 4. Extract 8. BatchSep
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Column
Shortcut
DSTWU Distl SCFrac
Rigorous
RadFrac Multifrac PetroFrac
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DSTWU
Ø Simple Column Ø Perhitungan Short-Cut Ø Terdiri dari 1 arus masuk & 2 arus keluar (top + bottom) Ø Asumsi yg digunakan :
§ Arus mol tetap § Relative volatility tetap
Ø Digunakan untuk kalkulasi R-min atau N (jumlah stage)-min Ø Metode yg dipakai : Winn-Underwood-Gilliland Ø DSTWU dapat memperkirakan
§ Jumlah refluks rasio dan jumlah stage teoritis yang dibutuhkan
§ Stage letak umpan dan kerja reboiler serta condenser
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DSTWU
Key Component Recovery
Light Key All material with lower boiling than the light key goes into the overheads
Mol light key in distilate / mol light key in feed
Haevy Key All material with higher boiling than the heavy key goes into the bottom
Mol heavy key in distilate / mol heavy key in feed
Input Output
Refluks ratio Number of stage
Number of stage Refluks ratio
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Example
Suatu campuran bahan yang terdiri dari : (satuan lb/hr) Propane 883 Iso-butane 2651 n-Butane 4418 iso-Pentane 3534 n-Pentane 6186
Ø Diinginkan n-Butane terambil sebagai hasil atas sebanyak 98% dan i-Pentane yang terbawa pada hasil atas hanya sebesar 4% dari jumlah feed
Ø Umpan masuk pada suhu 170 F dan tekanan 8,1 bar Ø Ada pressure drop sebesar 0,1 pada kondenser dan
reboiler
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Example
Jika refluks ratio sebesar 2,5 tentukan : Ø Jumlah stage minimum ? Ø Jumlah refluks minimum ? Ø Feed stage ? Ø Kerja boiler dan kondenser? Property-Method : PengRob
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Flowsheet
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Input
Next!
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Input Column Block
Next and Run!
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Pressure Drop pada Kolom
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Result
Reflux ratio Minimum
Jumlah stage minimum
Kerja boiler
Kerja condenser
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Reflux Ratio vs Jumlah Stage Teoritis
Input
Run!
Output
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Reflux Ratio Profile
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DISTL
� Shortcut simulasi distilasi multi komponen untuk mengetahui beban kondenser dan reboiler
� Terdiri dari : 1 arus umpan dan 2 produk � Spesifikasi yang dibutuhkan :
- Stage teoritis -Refluks rasio - Feed stage -Tekanan reboiler -Tekanan kondenser -Distilate to feed mole ratio
• Memakai pendekatan Edmister sebagai Approximate Group Method
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Flowsheet
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Result DSTWU → Input DISTL
Run!
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Result DISTL
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RAD-FRAC
� Rigorous model untuk simulasi multistage vapor-liquid fractionation
� Aplikasinya dapat digunakan untuk merancang : *Distilasi *Absorpsi *Reboiled Absorption *Stripping *Reboiled Stripping *Extractive Distilation *Azeotropic Distillation *Reactive Distillation
• Mampu menangani : Tiga fase Dua fase Sistem dengan daerah didih sempit dan luas Sistem dengan cairan sangat non-ideal
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RAD-FRAC
� Dapat mendeteksi adanya free-water phase � Menghandle padatan dalam stage � Memakai pump-around keluar dari suatu stage
dan mengembalikan ke stage yang sama atau lainnya
• Menghandle reaksi kimia : Konversi tetap Kesetimbangan Rate-controlled Elektrolitik
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RADFRAC
� Menghandle dua fase liquid dengan reaksi kimia yang berbeda pada tiap fase
� Menghandle presipitasi garam (pengendapan garam) � Kesetimbangan pada tiap plate
Murphree efisiensi Vaporisasi efisiensi
• Memakai tray atau packing (structured dan random packing)
• Jumlah arus masuk dapat bervariasi • Jumlah arus output dapat bervariasi (bisa terdapat
side stream)
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RAD-FRAC: Feed Stage
N-1
N
Liquid
Vapor
Above Stage
N-1
N
N+1
On Stage On Stage Liquid dan On Stage
Vapor • Seperti on-stage • Dipakai jika sudah tahu feed adalah 1 fase • Menghindari perhitungan flash yang tidak perlu
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Flowsheet
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Result DSTWU → Input RadFrac
Next!
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Input Pressure & Pressure Drop
Run!
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Result
Condenser Reboiler
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Profile Column
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Thank you J
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