CALCULATION OF PHASE EQUILIBRIUM OF SYSTEM VAPOR–LIQUID IN TERNARY MIXTURES ISOAMYLOL–ETHANOL–WATER AND ISOBUTANOL–ETHANOL–WATER AT HIGH CONCENTRATIONS OF HIGHER ALCOHOLS

2021 ◽  
Author(s):  
Т.Г. КОРОТКОВА ◽  
С.Ю. КСАНДОПУЛО ◽  
Т.А. УСТЮЖАНИНОВА ◽  
Н.В. СОЛОННИКОВА ◽  
М.О. КОЗЛОВА
Keyword(s):  
Phase Equilibrium ◽  
Atmospheric Pressure ◽  
Calculated Data ◽  
Liquid System ◽  
Ternary Mixtures ◽  
Binary Interaction ◽  
Higher Alcohols ◽  
Antoine Equation ◽  
High Concentrations ◽  
Vapor Liquid

Проведено сравнение экспериментальных и расчетных данных при описании фазового равновесия по методам группового вклада UNIQUAC и NRTL для трехкомпонентных смесей изоамилол–этанол–вода и изобутанол–этанол–вода системы пар–жидкость при атмосферном давлении и высоких концентрациях высших спиртов (10–20% мас.). При расчете упругости паров чистых компонентов использовано уравнение Антуана. Приведены константы Антуана и парные энергетические параметры бинарного взаимодействия исследованных компонентов методов UNIQUAC и NRTL. Оба метода хорошо описывают равновесие в этих системах. The experimental and calculated data are compared in the description of phase equilibrium by the methods of the group contribution of UNIQUAC and NRTL for three-component isoamylol-ethanol-water and isobutanol-ethanol-water mixtures of the vapor-liquid system at atmospheric pressure and high concentrations of higher alcohols (10-20% by weight). The Antoine equation was used for calculation of the elasticity of vapors of pure components. The Antoine constants and the pairwise energy parameters of the binary interaction of the investigated components of the UNIQUAC and NRTL methods are given. Both methods well describe balance in these systems.

COMPARISON OF EXPERIMENTAL AND CALCULATED DATA OF PHASE EQUILIBRIUM VAPOR–LIQUID MIXTURE IZOAMYL ALCOHOL–ISOBUTYL ALCOHOL AT LOW PRESSURE

2018 ◽  
Author(s):  
Т.Г. КОРОТКОВА ◽  
С.Ю. КСАНДОПУЛО ◽  
А.А. ГЛЫТЯН
Keyword(s):  
Phase Equilibrium ◽  
Vapor Phase ◽  
Boiling Point ◽  
Calculated Data ◽  
Isoamyl Alcohol ◽  
Quantitative Agreement ◽  
Liquid System ◽  
Isobutyl Alcohol ◽  
Low Pressures ◽  
Vapor Liquid

Проведено моделирование фазового изотермического равновесия в системе пар–жидкость бинарной смеси изобутиловый спирт–изоамиловый спирт при температурах 50, 60, 70, 80°С и низких давлениях и при рассмотрении паровой фазы как смеси идеальных газов. Для расчета коэффициентов активности использован метод NRTL. Изложен алгоритм расчета. В качестве исходных данных приняты состав жидкой фазы и температура кипения смеси. В результате итерационного расчета определены давление и состав паровой фазы. В виде подпрограммы использована стандартная методика расчета температуры кипения смеси. Получено хорошее качественное и количественное согласование между экспериментальными и расчетными данными по давлению и составу в паровой фазе в изотермических условиях. Установлено, что прогнозирование фазового равновесия в изотермических и изобарических условиях смеси изобутиловый спирт–изоамиловый спирт возможно с помощью метода NRTL при низких давлениях, включая атмосферное, в пределах которого осуществляются процессы разделения спиртовых смесей методом ректификации. The simulation of phase isothermal equilibrium in the vapor–liquid system of a binary mixture of isobutyl alcohol–isoamyl alcohol at temperatures of 50, 60, 70, 80°C at low pressures and considering the vapor phase as a mixture of ideal gases was carried out. The NRTL method was used to calculate the component activity coefficients. The algorithm of calculation is stated. As the initial data, the composition of the liquid phase and the boiling point of the mixture are taken. As a result of the iterative calculation, the pressure and composition of the vapor phase are determined. As a subprogram, the standard method of calculating the boiling point of the mixture was used. A good qualitative and quantitative agreement was obtained between the experimental and calculated data on pressure and composition in the vapor phase under isothermal conditions. It is concluded that the prediction of phase equilibrium, both in the isothermal and isobaric conditions of the mixture of isobutyl alcohol–isoamyl alcohol is possible using the NRTL method at low pressures, including atmospheric, within which the processes of separation of alcohol mixtures by distillation method are carried out.

Solid-Fluid Phase Equilibria Measurement for Mixtures of Methane, Carbon-Dioxide and N-Hexadecane

2021 ◽  
Author(s):  
Oluwakemi Victoria Eniolorunda ◽  
Antonin Chapoy ◽  
Rod Burgass
Keyword(s):  
Experimental Data ◽  
Carbon Dioxide ◽  
Equation Of State ◽  
Phase Equilibria ◽  
Activity Coefficients ◽  
Fluid Phase ◽  
Ternary Mixtures ◽  
Binary Interaction ◽  
Thermodynamic Models ◽  
Methane Carbon

Abstract In this study, new experimental data using a reliable approach are reported for solid-fluid phase equilibrium of ternary mixtures of Methane-Carbon-dioxide- n-Hexadecane for 30-73 mol% CO2 and pressures up to 24 MPa. The effect of varying CO2 composition on the overall phase transition of the systems were investigated. Three thermodynamic models were used to predict the liquid phase fugacity, this includes the Peng Robison equation of state (PR-EoS), Soave Redlich-Kwong equation of state (SRK-EoS) and the Cubic plus Association (CPA) equation of state with the classical mixing rule and a group contribution approach for calculating binary interaction parameters in all cases. To describe the wax (solid) phase, three activity coefficient models based on the solid solution theory were investigated: the predictive universal quasichemical activity coefficients (UNIQUAC), Universal quasi-chemical Functional Group activity coefficients (UNIFAC) and the predictive Wilson approach. The solid-fluid equilibria experimental data gathered in this experimental work including those from saturated and under-saturated conditions were used to check the reliability of the various phase equilibria thermodynamic models.

scholarly journals Recycling and Conversion of Yeasts into Organic Nitrogen Sources for Wine Fermentation: Effects on Molecular and Sensory Attributes

Fermentation ◽  
2021 ◽  
Vol 7 (4) ◽  
pp. 313
Author(s):  
Paula Rojas ◽  
Daniel Lopez ◽  
Francisco Ibañez ◽  
Camila Urbina ◽  
Wendy Franco ◽  
...  
Keyword(s):  
Organic Nitrogen ◽  
Protein Hydrolysate ◽  
Principal Component ◽  
Nitrogen Sources ◽  
Isoamyl Alcohol ◽  
Positive Influence ◽  
Higher Alcohols ◽  
Fermentation Performance ◽  
High Concentrations ◽  
Significant Positive Influence

Organic nitrogen plays a significant role in the fermentation performance and production of esters and higher alcohols. This study assessed the use of yeast protein hydrolysate (YPH) as a nitrogen source for grape must fermentation. In this study, we prepared an enzymatic protein hydrolysate using yeasts recovered from a previous fermentation of wine. Three treatments were performed. DAP supplementation was used as a control, while two YPH treatments were used. Low (LDH) and high degrees of hydrolysis (HDH), 3.5% and 10%, respectively, were chosen. Gas chromatography and principal component analysis indicated a significant positive influence of YPH-supplementations on the production of esters and higher alcohols. Significantly high concentrations of 3-methyl-1-penthanol, isoamyl alcohol, isobutanol, and 2-phenylethanol were observed. Significant odorant activity was obtained for 3-methyl-1-pentanol and ethyl-2-hexenoate. The use of YPH as nitrogen supplementation is justified as a recycling yeasts technique by the increase in volatile compounds.

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