Effect of Random Errors and Bias of Isobaric Equilibrium x, y and t Data of LiquidVapour Binary Systemson the Calculated Number of Theoretical Plates of a Rectification Column

1994 ◽  
Vol 59 (4) ◽  
pp. 841-854
Author(s):  
Ján Dojčanský ◽  
Soňa Bafrncová ◽  
Július Surový
Keyword(s):  
Phase Composition ◽  
Binary Systems ◽  
Random Errors ◽  
Rectification Column ◽  
Relative Volatility ◽  
Composition Data ◽  
Calculated Number ◽  
Theoretical Plates

The effect of random errors and bias of temperature and phase composition data in the isobaric L-G equilibrium on the calculated number of theoretical plates of a continuously working rectification column at various reflux ratios was investigated. Five model binary systems exhibiting different behaviour and relative volatility were used.

Effect of Errors in Temperature Measurement on the Accuracy of Composition of the Liquid-Vapour Phases and Their Impact on the Calculated Number of Theoretical Stages of Rectification Columns

1992 ◽  
Vol 57 (9) ◽  
pp. 1867-1878
Author(s):  
Ján Dojčanský ◽  
Soňa Bafrncová ◽  
Július Surový
Keyword(s):  
Phase Composition ◽  
Binary Systems ◽  
Equilibrium Temperature ◽  
Systematic Errors ◽  
Operating Conditions ◽  
Rectification Column ◽  
Relative Volatility ◽  
The Impact ◽  
Calculated Number

The effect of random and systematic errors in the determination of the equilibrium temperature on the phase composition in isobaric L-G equilibria was simulated on five binary systems with different size and relative volatility. The impact of the inaccuracies on the calculated number of theoretical stages of a continuously operating rectification column is discussed with respect to the different operating conditions of the separatory process.

A Simulated Experiment for Examining the Effect of Errors in the Composition of the Equilibrium Liquid-Vapour Phases on the Calculated Number of Theoretical Stages of a Rectification Column

1993 ◽  
Vol 58 (3) ◽  
pp. 506-516
Author(s):  
Ján Dojčanský ◽  
Soňa Bafrncová ◽  
Július Surový
Keyword(s):  
Phase Composition ◽  
Binary Systems ◽  
Equilibrium Phase ◽  
Operating Conditions ◽  
Random Errors ◽  
Rectification Column ◽  
Simulated Experiment ◽  
Equilibrium Phase Composition ◽  
Calculated Number

Five model binary systems differing in the relative volatilities and their changes were used to simulate the effect of random errors and bias in the L-G equilibrium phase composition on the calculation of the number of theoretical stages of a continuously working rectification column in various operating conditions.

scholarly journals Isothermal vapour-liquid equilibria in cyclohexanone + dichloroalkane binary mixtures at temperatures from 298.15 to 318.15K

2011 ◽  
Vol 76 (2) ◽  
pp. 305-315 ◽  
Author(s):  
Dana Dragoescu ◽  
Alexandru Barhala ◽  
Mariana Teodorescu ◽  
Daniela Chiscan
Keyword(s):  
Phase Composition ◽  
Liquid Phase ◽  
Binary Mixtures ◽  
Activity Coefficients ◽  
Virial Coefficient ◽  
Vapour Phase ◽  
Composition Data ◽  
Gibbs Energies ◽  
Significant Difference ◽  
Liquid Phase Composition

The vapour pressures of binary mixtures of cyclohexanone + dichloroalkane (1,3-dichloropropane and 1,4-dichlorobutane) were measured at temperatures between 298.15 K and 318.15 K. The vapour pressures vs. liquid phase composition data were used to calculate the activity coefficients of the two components and the excess molar Gibbs energies GE for the mixtures, using the Barker method and the Redlich-Kister, Wilson, NRTL and UNIQUAC equations, taking into account the vapour phase imperfection in terms of the 2nd virial coefficient. No significant difference between the GE values obtained with these equations was observed.

scholarly journals Thermodynamic studies in the MgO – FeO – Al2O3 system

2020 ◽  
Vol 120 ◽  
pp. 115-119
Author(s):  
O. M. Borysenko ◽  
S. M. Logvinkov ◽  
G. M. Shabanova ◽  
A. M. Korohodska ◽  
I. A. Ostapenko ◽  
...  
Keyword(s):  
Phase Composition ◽  
Thermodynamic Stability ◽  
High Performance ◽  
Binary Systems ◽  
Complete Information ◽  
Phase Changes ◽  
Performance Characteristics ◽  
Refractory Materials ◽  
Component System ◽  
Thermodynamic Studies

Prediction of the phase composition is one of the most important tasks in the development of new refractory materials and their operation in thermal units. The most complete information on phase interactions and thermodynamic stability of phase combinations is contained in the phase diagrams. The article presents thermodynamic studies of the three - component system MgO – FeO – Al2O3, which is of great interest for the production of refractory materials with high performance characteristics. Based on the analysis of binary systems of this system, it was found that, the stable phases are MgO, FeO, Al2O3 and MgAl2O4, FeAl2O4. The results analysis of calculating the Gibbs energy for the reaction (FeO + MgAl2O4 = MgO + FeAl2O4) indicates the thermodynamic stability of the phases combination of MgO, FeAl2O4 to a temperature of 1141 K. Above the temperature of 1141 K FeO and MgAl2O4 are stable phases. Thus, in the system MgO – FeO – Al2O3 up to the temperature of 1141 K, the phases MgO – FeAl2O4 and MgAl2O4 – FeAl2O4 coexist, above this temperature — FeO – MgAl2O4 and MgAl2O4 – FeAl2O4. The data obtained make it possible to predict thermally stimulated phase changes that give the effect of thermoplasticity and will be important for obtaining refractory materials with high performance characteristics based on the MgO — FeO — Al2O3 system.

scholarly journals Electrodeposition and Electrooxidation of Bimetallic Systems Co–Ni and Cu–Ni

2015 ◽  
Vol 17 (3) ◽  
pp. 181 ◽  
Author(s):  
N.V. Ivanova ◽  
A.A. Kubylinskaya ◽  
Yu.A. Zakharov
Keyword(s):  
Phase Composition ◽  
Binary System ◽  
Metal Ions ◽  
Solid Solutions ◽  
Binary Systems ◽  
Graphite Electrode ◽  
Supporting Electrolyte ◽  
Oxidation Processes ◽  
Bimetallic Systems ◽  
Inert Substrate

By means voltammetry method the characteristics of the electrodeposition and anodic oxidation processes of Cu, Ni, Co and Cu–Ni, Co–Ni were investigated in ammoniacal buffer supporting electrolyte using graphite electrode. The quantity, maximum currents and potentials of anodic peaks on the voltammetric curves in the case of binary system are defined by the ratio of metal ions concentration and electrodeposition procedure. The changes in the peaks parameters were attributed to the formation of bimetallic solid solutions with various contents of the components. It was shown that the result of coelectrodeposition of two metals on an inert substrate is determined not only the nature of the components of binary systems Co–Ni and Cu–Ni, but also features of the phase composition of bimetal in nano-state.

Simulation and Optimization on the Process of Acetic Acid Dehydration via Extraction Combined with Azeotropic Distillation

2012 ◽  
Vol 548 ◽  
pp. 349-354
Author(s):  
Yi Feng Chen ◽  
Ji He Yang
Keyword(s):  
Acetic Acid ◽  
Acetic Acid Solution ◽  
Azeotropic Distillation ◽  
Weight Percent ◽  
Dilute Solution ◽  
Relative Volatility ◽  
Simple Distillation ◽  
Simulation And Optimization ◽  
Isopropyl Acetate ◽  
Theoretical Plates

Some azeotropic entrainers in the process of acetic acid dehydration could extract acetic acid from its dilute solution; this text would observe the ability of extraction about these entrainers mentioned in the literatures. By using the EXTRACT module in Aspen Plus, it is found that isopropyl acetate was the most effective extracting agent. The process of acetic acid dehydration via extraction combined with azeotropic distillation by using isopropyl acetate was established. Acetic acid was first extracted from its dilute solution and then was distilled in the azeotropic column, finally acetic acid having 99.8%(weight percent) purity was obtained. This process avoided evaporating a lot of water from the solution, and the entrainer’s existence effectively enhanced the relative volatility between acetic acid and water. The simulation result indicated that when dealing with the acetic acid solution used in this research, the total heat exhaustion was reduced from 11.73MW to 2.98MW and the number of theoretical plates needed in the distillation was also reduced from 65 to 34 compared with simple distillation.

Control Model of the Synthesis of Binary Systems under Loading Reactive Additives into the Mixture

2015 ◽  
Vol 1084 ◽  
pp. 647-651
Author(s):  
Dmitry G. Demyanyuk ◽  
Oleg Yu. Dolmatov ◽  
Dmitry S. Isachenko ◽  
Mikhail S. Kuznetsov ◽  
Andrew O. Semenov ◽  
...  
Keyword(s):  
Energy Source ◽  
Phase Composition ◽  
Comparative Analysis ◽  
Binary Systems ◽  
Control Model ◽  
Heat Energy ◽  
Nickel Aluminum ◽  
Temperature Synthesis ◽  
High Temperature Synthesis ◽  
Reactive Additives

It has been calculated that the introduction of nickel-aluminum additives leads to an increase in the heat effect and allows for the development of materials with the desired phase composition. A comparative analysis of the results of design and instrumentation experiments has shown a satisfactory agreement which allows us to speak about the correctness of the developed numerical model as well as the possibility of selecting optimal initial values ​​of the heat energy source as a factor which allows for controlling the reaction of self-propagating high-temperature synthesis and eventually the phase composition of the final product.

A robust new tool for online solution-phase sampling of crystallizations

2021 ◽  
Author(s):  
Andrew J Kukor ◽  
Mason A. Guy ◽  
Joel Hawkins ◽  
Jason E Hein
Keyword(s):  
Phase Composition ◽  
Real Time ◽  
Solid Phase ◽  
Solution Phase ◽  
Composition Data ◽  
Phase Sampling ◽  
Solid Phase Composition

Current PAT tools struggle to provide real time solid-phase composition data for crystallizations. HPLC offers a variety of benefits over other solution-phase PATs and can be used to infer solid-phase...

Sign in / Sign up

Export Citation Format

Share Document