Engineering Commons^™

Design Of Multipass Fractionating Trays, Paul W. Becker

Theses

Multipass fractionating trays are vapor-liquid contacting devices with high liquid handling capabilities which can be economically used in large fractionating towers. However, process design engineers in the chemical and petroleum industries seem to have an aversion to specifying multipass trays for their tower designs. This thesis presents the case for using multipass trays as well as methods for their design.

Because multipass trays are not symmetrical, as one and two pass trays are, the liquid and vapor need not split equally between the three or four passes. Equations are developed which enable the vapor and liquid flowrate for each pass …

Simulation Of A Single Feed Fractional Distillation Column Using The Thiele-Geddes Procedure, M. S. Abolahrari

Theses

This thesis constitutes a simulation model of a single feed frational distillation column consisting of a single phase distillate, liquid or vapor product, an equilibrium stage reboiler, and a cascade consisting of theoretical equilibrium stages. The model limitations in addition to the single feed and the single phase distillate are 20 identifiable components, and 100 theoretical equilibrium stages. The thermodynamic data required are vapor-liquid equilibrium data and vapor-liquid enthalpy data, both assumed to be correlatable as functions of temperature. Compositional dependence of the thermodynamic data is ignored, but minor pressure variations throughout the cascade can be incorporated into the vapor-liquid …

The Effect Of Column Diameter On The Efficiency Of Packed Fractioning Towers, William Lintner

Theses

The object of this work was to study the effect of packed column diameter on the fractionation efficiency so that a more reliable engineering approach could be employed in the scaling up of fractionating columns.

The height equivalent to a theoretical plate (HETP) was employed to compare column efficiencies in this study. The HETP was calculated for several gas mass velocities through columns of one-inch, two-inch and three-inch diameter, packed with one-quarter inch Berl saddles. All data were collected at total reflux conditions employing the standard n-heptane-methylcyclohexane binary.

The results indicated that the efficiencies of the one-inch and two-inch diameter …

The Analogy Between Heat And Mass Transfer In Packed Beds, Jasper Joseph Correnti

Theses

An operation which recurs in many branches of chemical engineering is that in which a fluid - gas or liquid - is passed through a bed of granular solids for the purpose of removing from, or adding something to the fluid (or both). In the oil and sugar industries, oils or syrups are passed through beds of adsorbents to remove impurities causing color and other undesireable effects. In the recovery of volatile solvents, air charged with solvent vapor is passed over solid adsorbents. In leaching, liquids are passed through beds of solids to remove some constituent of the solids. In …

Correlation Of The Number Of Theoretical Plates Vs. Reflux Ratio, George Ignatius Parisi

Theses

A correlation is presented from which the number of theoretical plates for a given separation by distillation can be estimated as a function of the reflux ratio. The effects of relative volatility and feed composition upon such a correlation are also studied. Smoker's (1) equation was used in calculating the data. The results were obtained by varying the several parameters which have to be given for any separa tion desired. These include feed compositions of 0.25, 0.50, and 0.75; relative volatilities of 1.1, 1.2, 1.5, and 2.0; and various reflux ratios. The overhead product and bottoms product compositions were kept …