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Articles 1 - 14 of 14
Full-Text Articles in Engineering
Continuous Interfacial Polycondensation Of Nylon 6-6, Chandrakant A. Patel
Continuous Interfacial Polycondensation Of Nylon 6-6, Chandrakant A. Patel
Theses
Nylon 6-6 has been prepared by continuous interfacial polycondensation from hexamethylene diamine and adipyl chloride in a stirred system. The effect of monomer concentration and stirring on the intrinsic viscosity of polyamide 6-6 solution in formic acid (90%) was determined.
As stirring rate and monomer ratio increased, the intrinsic viscosity and polymer yield went through a maximum. Diffusion coefficient (DAB) for hexamethylene diamine was calculated and from that JD and mass transfer coefficient /DAB were calculated. A relation between Reynolds number and JD factor was established by correlation curve.
Dielectric Properties Of Atactic And Isotactic Polystyrene, Thaddeus F. Kroplinski
Dielectric Properties Of Atactic And Isotactic Polystyrene, Thaddeus F. Kroplinski
Theses
The purpose of this investigation was to determine the dielectric constant and dissipation factor of atactic and isotactic polystyrene at 25°C and at frequencies of 0.1, 1.0, 10, and 100 kilocycles per second. In addition, the effects of molecular weight and crystallinity on the dielectric properties of polystyrene mos also studied.
Polystyrene slabs of uniform thickness mere prepared by molding the polymer under heat and pressure. The isotactic polystyrene slabs Imre annealed at 175°g for various lengths of time to achieve varying degrees of crystallinity.
The molded polystyrene slabs were fitted with circular aluminum foil electrodes to form a three …
The Oxidation Of Carbon Monoxide By Magnesium Aluminate, James A. Whelan
The Oxidation Of Carbon Monoxide By Magnesium Aluminate, James A. Whelan
Dissertations
In this research the catalytic oxidation of carbon monoxide was investigated on magnesium aluminate catalysts, MgO:xAl2O3, with five different compositions, x, ranging from 1.0 to 3.0. The reaction was run at temperatures ranging from 500 to 600 °C. with radioactive carbon monoxide as the tracer. An experimental technique has been devised for the analysis of unreacted CO which takes into account a correction for the solubility of CO in CO2.
Four mathematical models were postulated to explain the mechanism of reaction. The models were examined against experimental data by means of non-linear least squares …
A Simple Method For Liquid Enthalpy Departure Calculations, Ching-Lin Chien
A Simple Method For Liquid Enthalpy Departure Calculations, Ching-Lin Chien
Theses
The reduced equation of state for gases and liquids developed by Benson and Golding in 1951 is modified and used to calculate liquid enthalpy departures for saturated pure substances and mixtures. The temperature-independent coefficients in the modified equation are determined from critical properties and experimental liquid enthalpies at the boiling point and at the critical point. The results of the proposed method are compared with those predicted with the modified Redlich-Kwong equation of state by Joffe and Zudkevitch.
Agitation Of Dilatant Fluids, Vijay Jang Datta
Incineration Of Solid/Liquid Human Waste, Theodore Joseph Wayne
Incineration Of Solid/Liquid Human Waste, Theodore Joseph Wayne
Theses
This thesis encompasses the design criteria required to produce an effective incineration system for the disposal of solid/liquid human waste. Coupled with the overall design parameters is an investigation of the chemical decomposition of the waste during the incineration process, odor treatment and control, and the physiological effects on the human body due to the inhalation of the toxic gases given off during the combustion of human waste.
The variables involved in the combustion process are studied and equations presented that relate the combustion variables of flame temperature, residence time and air requirements. These equations are tested based upon published …
Computer Model For Reactor Design Of An Ethane Cracking Unit, Derek J. Lough
Computer Model For Reactor Design Of An Ethane Cracking Unit, Derek J. Lough
Theses
The purpose of this thesis is to develop a Fortran [sic] Computer Program to model the radiation section of a pyrolysis tube reactor designed for cracking 100 percent ethane feed. The model calculates the length of the tubular reactor required to obtain a specified ethane conversion or the ethane conversion for a specified reactor length. The resulting solution yields a conversion profile, a temperature profile, and the reactor residence time as a function of tube length. From this data it can be determined if the design is adequate and lies within the reactor model's constraints.
Prediction Of The Physical Properties Of Pure Gases And Liquids, James L. Filson
Prediction Of The Physical Properties Of Pure Gases And Liquids, James L. Filson
Theses
A computer programmed system for the estimation of physical properties of pure compounds from minimum data input on compound type and structure was developed for both gas and liquid phase conditions.
The properties of the gas phase which can be obtained include:
- gas volume
- compressibility
- normal boiling point
- volume at the normal boiling point
- critical temperature, pressure, volume compressibility
- vapor pressure
- Riedel factor
- acentric factor
- ideal heat capacity
- heat capacity at constant pressure
- heat capacity at constant volume
- dipole moment
- intermolecular distance
- hard sphere volume
- viscosity at low pressure
- viscosity at elevated pressure
- thermal conductivity at low pressure
- thermal conductivity …
A Nomograph For The Rapid Solution Of The Arrhenius Equation, Joseph John Lamont
A Nomograph For The Rapid Solution Of The Arrhenius Equation, Joseph John Lamont
Theses
There are presently no calculational aids for the rapid computation of the Arrhenius parameters of the chemical reaction rate equations.
Two nomographs for solving the Arrhenius equation for the relative reaction rate constants at different temperatures, and for computing activation energies and frequency factors are presented. Several graphs and tables of the relative reaction rate constant as a function of activation energy and temperature are also presented.
The nomographs, graphs and tables can be used, singly or combined, in lieu of numerical calculation for the solution for Arrhenius parameters, or the computation of rate constants.
A computer program included in …
A Simulation Model Capable Of Performing The Calculations Involved In Defining A Crude Preheat Train, Robert G. Parker
A Simulation Model Capable Of Performing The Calculations Involved In Defining A Crude Preheat Train, Robert G. Parker
Theses
A simulation model has been developed for a system of ex changers to preheat the feed to a crude distillation unit. In conjunction, a Fortran program for the performance of the model calculations by digital computer was written. Two types of preheat system were simulated, a single train system and a split (or parallel) train system. A number of features were included in the program for flexibility and versatility. A particular effort was made to have the model represent as economical a preheat system as possible.
The model program was used to obtain computer-calculated results for both single-train and split-train …
Local Mole Fraction Equations For The Excess Free Energy Of Mixing, Jose Mario Marina
Local Mole Fraction Equations For The Excess Free Energy Of Mixing, Jose Mario Marina
Dissertations
An extensive study of local mole fraction equations aimed at obtaining a two parameter expression for the Excess Free Energy of miscible and immiscible systems has been undertaken.
Initially our approach was to modify existing equations by substituting those parameters reflecting interaction between like molecules by the pure component energies of vaporization. This resulted in a one parameter modification of the three parameter Wilson equation, which correlates data poorly and a two parameter modification of the NRTL equation which correlates binary miscible data with fair accuracy. A modification of the Scatchard-Hildebrand equation, where mole fractions are substituted by local mole …
Stability Analysis Of A Continuous Stirred Tank Reactor With An Autocatalytic Reaction, David Elliot Rosenberg
Stability Analysis Of A Continuous Stirred Tank Reactor With An Autocatalytic Reaction, David Elliot Rosenberg
Theses
The basic principles of stability analysis are set forth, including the development of a mathematical model, steady state analysis, integration of the dynamic system equations, and predictions of transient responses. The equations for the mathematical model are developed for a continuous stirred tank reactor with a cooling jacket, containing an autocatalytic reaction, in unsteady state operation. These equations are numerically integrated to obtain a good picture of reactor dynamics about the steady state. State variable methods, including the classical linearization theorems and Lyapunov's Second Method, are utilized to predict bounds of stable reactor behavior. A discussion of the shortcomings of …
A Study Of Heat Transfer And Inlet Flow Behavior In Molten Polymer Systems, Min Ho Choi
A Study Of Heat Transfer And Inlet Flow Behavior In Molten Polymer Systems, Min Ho Choi
Theses
Two separate studies have been done in the present work: one to study the entrance effects in flow in molten polymer systems and the other to investigate the heat transfer to thermally softened flowing polymer.
The equipment for the entrance effect was designed to study the isothermal flow behavior of a polymer melt in the entrance region. The main object of this investigation was to find the entrance length for the melt to relax and to separate the pressure drop into viscous and elastic effect. Due to the failure in developing a proper pressure measuring device the experiment was not …
The Reaction Of O-Propylphenyl Azide With Di-N-Propylamine, Seyed Ziaeddin Razavi
The Reaction Of O-Propylphenyl Azide With Di-N-Propylamine, Seyed Ziaeddin Razavi
Theses
Nitration of n-propylbenzene resulted in O-nitro-n-propylbenzene. Reduction of this compound gave o-n-Propylphenyl azide was prepared by diazotization of o-n-propylaniline followed by treatment with sodium azide.
Photolysis of o-n-propylphenyl azide in di-n-propyl-amine yielded two new azepines, 2-di-n-propylamino-3n-propyl-3H azepine and 2-di-n-propylamino-7-n-propy1-7H-azepine. Their structures were assigned on the basis of their physical properties (i.e. I.R., U.V., N.M.R., N.S. and elemental analysis).
Photolysis of the azide at room temperature gave 26.9% o-n-propylaniline and 4.3% 2-di-n-propylamino-3-n-propy1-3H azepine, but when the photolysis was carried out in the presence of the triplet photosensitizer (xanthen-9-one) the yield of o-n-propylaniline was increased to 34.6% and the yield of 2-di-n-propylamino-3n-propy1-3H-azepine …