Balance Equations for Molecular Distillation

Micov, Miroslav; Lutišan, Juraj; Cvengroš, Ján

doi:10.1080/01496399708000795

Cited by 42 publications

(20 citation statements)

References 4 publications

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“…Centrifugal and falling films are two basic types of molecular distillation units which use a short exposure of the distilled liquid to the evaporating cylinder. The high temperature exposure time in these stills is on the order of a few seconds to tenths of seconds as the liquid is spread evenly in the form of a film (Micov et al, 1997). These types of distillation units have been used successfully to demonstrate and compare the distillation of many different compounds, such as carotenoids from palm oil (Batistella & Marciel, 1998), cuphea fatty acids , and estolides (Isbell & Cermak, 2004).…”

Section: Distillationmentioning

confidence: 99%

Distillation of Natural Fatty Acids and Their Chemical Derivatives

Cermak¹,

Evangelista²,

Kenar³

2012

Distillation - Advances From Modeling to Applications

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Section: Distillationmentioning

confidence: 99%

Distillation of Natural Fatty Acids and Their Chemical Derivatives

Cermak¹,

Evangelista²,

Kenar³

2012

Distillation - Advances From Modeling to Applications

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“…The vapors generated on the surface of the liquid film are condensed upon reaching the surface of the condenser cylinder; thus, the new liquid phase descends and leaves the molecular distillation as a distillate rich in the more volatile components of the mixture. The initial thickness of the film is in the order of the tenth of a millimeter, while the cylinder radius is in the order of centimeters (Micov et al, 1997).…”

Section: Model Descriptionmentioning

confidence: 99%

“…At these pressures the relative volatility of the components increases and the operating temperature can be reduced to values lower than the conventional distillation temperature (Micov et al, 1997), allowing the separation of compounds that at higher temperatures are denatured or degraded.…”

Section: Introductionmentioning

confidence: 99%

Methodology for predicting oily mixture properties in the mathematical modeling of molecular distillation

2017

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SUMMARY:A methodology for predicting the thermodynamic and transport properties of a multi-component oily mixture, in which the different mixture components are grouped into a small number of pseudo components is shown. This prediction of properties is used in the mathematical modeling of molecular distillation, which consists of a system of differential equations in partial derivatives, according to the principles of the Transport Phenomena and is solved by an implicit finite difference method using a computer code. The mathematical model was validated with experimental data, specifically the molecular distillation of a deodorizer distillate (DD) of sunflower oil. The results obtained were satisfactory, with errors less than 10% with respect to the experimental data in a temperature range in which it is possible to apply the proposed method. KEYWORDS: Modeling; Molecular distillation; Oily mixtures; PropertiesRESUMEN: Metodología para la predicción de propiedades de mezclas oleosas en el modelado matemático de la destilación molecular. Se presenta una metodología para la predicción de las propiedades termodinámicas y de transporte de mezclas oleosas multicomponentes, en la cual se agrupan los diferentes componentes de la mezcla en un número reducido de pseudocomponentes. Esta predicción de propiedades se utiliza en el modelado matemático de la destilación molecular que consta de un sistema de ecuaciones diferenciales en derivadas parciales, según los principios de los fenómenos de transporte y se resuelve mediante un método implícito de diferencias finitas mediante un código computacional. El modelo matemático fue validado con datos experimentales, específicamente de la destilación molecular de un destilado de desodorización (DD) de aceite de girasol. Los resultados obtenidos fueron satisfactorios, con un error menor al 10% en un rango de temperaturas.

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“…Molecular distillation (MD) is a gentle method appropriate for the separation and purifi cation of thermally unstable materials as well as compounds with a low vapour pressure and high molecular weight, without the hazard of thermal decomposition (MICOV et al, 1997). This method is characterized by a short exposure of the distilled liquid to elevated temperatures, high vacuum in the distillation space, and small distance between the evaporator and the condenser (CVENGROS, 1995).…”

mentioning

confidence: 99%

Optimizing conditions for refining unsaturated fatty acids fromHippophae rhamnoidesL. seed oil by molecular distillation using response surface methodology

Zhang¹,

Li²,

Wang³

et al. 2015

Acta Alimentaria

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The refi nement of unsaturated fatty acids (UFA) from Hippophae rhamnoides L. seed oil was carried out by molecular distillation (MD) using response surface methodology (RSM). A central composite rotate design was used in order to optimize the experimental parameters: distilling temperature and feed fl ow. The optimal MD conditions were determined and the quadratic response surfaces were drawn from the mathematical models. The results suggested that the distilling temperature and feed fl ow signifi cantly affected both the UFA content and oil yield in the two models. The optimum conditions for refi ning UFA were: distilling temperature 107.5 °C and feed fl ow 1 ml min -1 . Optimal values predicted by RSM for the UFA content and oil yield were 82.38% and 62.59%, respectively. Close agreement between experimental and predicted values was obtained.

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Balance Equations for Molecular Distillation

Cited by 42 publications

References 4 publications

Distillation of Natural Fatty Acids and Their Chemical Derivatives

Distillation of Natural Fatty Acids and Their Chemical Derivatives

Methodology for predicting oily mixture properties in the mathematical modeling of molecular distillation

Optimizing conditions for refining unsaturated fatty acids fromHippophae rhamnoidesL. seed oil by molecular distillation using response surface methodology

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