# L20 - Lecture 20 Gas Film Coefficient Ky kg Hy...

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Lecture 20

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Gas Film Coefficient • Ky, kg, Hy. • Experimentally, NH 3 absorption in water; NH 3 is highly soluble in water; liquid phase mass resistance is small. • Hoy, Hy (Hy is 10% less than Hoy) •Hoy α Gy 0.3 to 0.4 »Ky α Gy 0.6 to 0.7 . • As Gx increases, Hoy decreases (liquid hold up ,Interfacial area , Hy )
•Hoy α Gx -0.7 to -0.4 • Fig 18.22 (Raschig-Ring Packing) Gx = 500 Lb/ft 2 h Gx = 1500 Lb/ft2 h Log Hoy (ft) Log Hy Log Gy (Lb/ft 2 h)

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• For gases other than NH 3 , use Hy = Hy, NH3 (N sc /0.66) 0.5 ¾ OTHER PACKING. fp = (Kya) any Packing = (Kya) 1-5” Raschig ring Packing = Hy, 1-5” Raschig R. Hy, any packing at Gx = 1000 Lb/ft2 h and Gy = 500 Lb/ft2 h (Listed in Table 18-1)
• Ceramic Intalox saddle packing fp ~ 2.27 for ½” ~ 0.64 for 3” As size of packing ,fp

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Log P Log Gy Gx Flooding Loading -Dry packing: p α Gy 1.8 (Argun Eq. Gy
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L20 - Lecture 20 Gas Film Coefficient Ky kg Hy...

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