C1j C2j C3

d Dc

Ez Cs

Pg Pi ug

Column cross-sectional area

Packing pressure drop Packing spreading factor Orifice flow coefficient Constants in pressure drop correlations Orifice diameter Column diameter Bed efficiency Vapour capacity factor, defined by

C = ug(Pg/(Pl — Pg))0'5 Gas density Liquid density Vapour velocity ft2

in in

ft s lbf"3 lbf"3 fts"1

G Gf


a a0


Qd Zb v

inches of liquid inches of liquid

Liquid head over distributor orifice Vapour pressure drop across liquid distributor

Vapour flow mass velocity lb ft~2 h_1 Vapour flow mass velocity lb ft"2 (in Robbins equation) Vapour flow Liquid mass flow Liquid mass flow Liquid mass flow at point i

Liquid average mass flow lb h lb ft lb ft gallons min"1 ft gallons min


Packing factor

HETP correlation factor

Number of measured points

(in distributor testing)

Height equivalent of a in theoretical plate

High of a transfer unit in

Liquid viscosity cP

Liquid specific gravity

Flow factor =

Vapour flow parameter. At flooding Y = Yf Flooding parameters, defined by eqns [10] and [11]

Packing surface area ft2 ft

Open area of one drip point Relative volatility Void fraction Surface tension Gravitational constant Number of theoretical stages

Reflux ratio Minimum reflux ratio Maldistribution originated % by the distributor design Total initial maldistribution% Effective bed %

maldistribution Liquid flow

Distributor quality Bed height Kinematic viscosity constant = ^l/Sg Ratio of the equilibrium curve slope to the operating line slope dynes cm 1 32.2 ft s"2

gallons min"1 %

See also: I/Distillation: Historical Development; Modelling and Simulation; Theory of Distillation; Tray Columns: Performance; Tray Columns: Performance; Vapour-Liquid Equilibrium; Correlation and Prediction; Vapour-Liquid Equilibrium: Theory.

Solar Panel Basics

Solar Panel Basics

Global warming is a huge problem which will significantly affect every country in the world. Many people all over the world are trying to do whatever they can to help combat the effects of global warming. One of the ways that people can fight global warming is to reduce their dependence on non-renewable energy sources like oil and petroleum based products.

Get My Free Ebook

Post a comment