文档介绍：CONCEPTUAL DESIGN OF
SIMPLE DISTILLATION COLUMNS
Goals:
u Determine feasibility of proposed separation
u Estimate tray and reflux requirements
u Estimate column diameter and height
9/27/99 Simple Distillation Design 1
DEFINITION OF SIMPLE DISTILLATION
u A distillation column with a single feed and no side
streams
u Vapor-liquid equilibrium
ð Ideal (Raoult’s Law)
ð Nearly ideal (modified Raoult’s Law)
ð No azeotropes
u Modest heat effects - no substantial variations in vapor
and liquid traffic above and below the feed
9/27/99 Simple Distillation Design 2
REQUIREMENTS FOR A FEASIBLE DESIGN
u Achieve product specifications
ð Purity
ð Fractional recovery
u Reboil and condense using availability utilities
u Column diameter and height should be within
fabricatable limits
ð Diameter < 7 m
ð Height < 35 m
9/27/99 Simple Distillation Design 3
Distillation Column Design Procedure
Determine
Calculate
Column Specs Modify
Minimum Reflux
and Constraints
Requirement
(Underwood)
Choose Reflux Rate Estimate Overall
Set Column
and Estimate Tray Efficiency
Operating Theoretical Tray
(O'Connell,
Pressure Requirement
(Gilliland) Murphree)
Calculate Vapor Calculate Actual
No
and Liquid Trays Required
OK?
Traffic and Column
VB, VT, LB, LT Height (HCOL)
Yes
Calculate Calculate Column
Mininum Tray Diameter No
Ab