Page 17 - Gas Purification 5E

Introduction 7

Table 1-3
Selection Guide for Gas-liquid Contactom

Staged Columns Rating of Column Internals
Perforated, Bubble Cap Merential Columns Pseudo-Equilibrium
Conditions or Valve or Tunnel Randomly Systematically Downcomer- Disc and
of Application Trays Trays Packed Paeked less Donut

Low pressure (e100 mm Hg) 2 1 2 3 0 1
Moderate pressure 3 2 2 1 1 1
High pressure
(>50% of critical) 3 2 2 0 2 0
High turndown ratio 2 3 1 2 0 1
Low liquid rates 1 3 1 2 0 0
Foaming systems 2 1 3 0 2 1
Internal tower cooliig 2 3 1 0 1 0
Solids present 2 1 1 0 3 1
Diay or polymerized solution 2 1 1 0 3 2
Multiple feeds and sidesixam 3 3 1 0 2 1
High liquid rates (scrubbing) 2 1 3 0 3 2
Small diameter columns 1 1 3 2 1 1
Columns with diametex 3-10 ft 3 2 2 2 2 1
Large diameter columns 3 1 2 1 2 1
Corrosive fluids 2 1 3 1 2 2
Viscous fluids 2 1 3 0 1 0
Low AP (efficiency
no concern) 1 0 2 2 0 3
Expanded column capacity 2 0 2 3 2 0
Low cost (performance
no concern) 2 1 2 1 3 3
Available design procedures 3 2 2 1 1 1
~~
Notes:
Rating key: 0 - Do not use
I - Evaluatecarefully
2 - Usuallyapplicable
3 - Bestselection
Staged columns: Trq columns with separate liquid and vapor flow paths.
Common types: Bubble cap, sieve, valve.
Proprietary f)pes: Angle, Uniflu, MOnQ, Linde, Thorman, Jet.
Diffiential columns: True countercurrentflow of gas and liquid.
Randomly packed: Rawhig rings, saddles, sloned rings, Tellerettes, Maspac.
Systematically packed: Flaipac. Goodloe, HyperjZ, Sulzer, Glitch Grid.
Pseudo-equilibrium stages: Countercutrent flow of gas and liquid with discrete trays.
Downcomerless trays: Pe$orated, Turbogrid, Ripple.
Low pressure drop trays: Disc and donut, shower deck
Special devices (not rated in table):
Venturi scrubber, turbulent contact absorber, marble bed absorber, horizontal spray chamber, cocurrent rotator.
Based on data of Frank 1977