Design Of Gas Absorption Systems

General Design Procedure 14-7

Selection of Solvent and Nature of Solvents 14-7

Selection of Solubility Data 14-8

Example 1: Gas Solubility 14-9

Calculation of Liquid-to-Gas Ratio 14-9

Selection of Equipment 14-9

Column Diameter and Pressure Drop 14-9

Computation of Tower Height 14-9

Selection of Stripper Operating Conditions 14-9

Design of Absorber-Stripper Systems 14-10

Importance of Design Diagrams 14-10

Packed-Tower Design 14-11

Use of Mass-Transfer-Rate Expression 14-11

Example 2: Packed Height Requirement 14-11

Use of Operating Curve 14-11

Calculation of Transfer Units 14-12

Stripping Equations 14-13

Example 3: Air Stripping of VOCs from Water 14-13

Use of HTU and Ka Data 14-13

Use of HETP Data for Absorber Design 14-13

Tray-Tower Design 14-14

Graphical Design Procedure 14-14

Algebraic Method for Dilute Gases 14-14

Algebraic Method for Concentrated Gases 14-14

Stripping Equations 14-14

Tray Efficiencies in Tray Absorbers and Strippers 14-15

Example 4: Actual Trays for Steam Stripping 14-15

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