Statistical parameters of separation processes

2020 ◽  
pp. 28-33
Author(s):  
E. M. Barsky ◽  
M. D. Barsky
Keyword(s):  
Statistical Approach ◽  
Solid Phase ◽  
Maximal Entropy ◽  
Statistical Parameters ◽  
Two Phase ◽  
Separation Processes ◽  
Statistical Process ◽  
Energy Characteristics ◽  
Phase Systems ◽  
Phase Mobility

The regime of two-phase ascending flow in which the solid phase can move in both directions is called critical. The analysis of such flows from the standpoint of statistical approach has allowed establishing main parameters characterizing this mass process. Chaotizing factor and solid phase mobility are among its energy characteristics. It is shown that two-phase systems that can exchange energy and particles, evolve towards an equilibrium state with maximal entropy. In this case, the ratio of mobility factors in all parts of the system to the chaotizing factor acquires the same value. The analysis of this ratio leads to a universal criterion of separation curves affinization. In this respect, the identity of this criterion for different size classes ensures their equal extractability. A correlation between principal parameters characterizing a two-phase flow as a statistical process is determined. Ill. 4. Ref. 4.

Lipase purification using ionic liquids as adjuvants in aqueous two-phase systems

2015 ◽  
Vol 17 (5) ◽  
pp. 3026-3034 ◽  
Author(s):  
Ranyere L. Souza ◽  
Sónia P. M. Ventura ◽  
Cleide M. F. Soares ◽  
João A. P. Coutinho ◽  
Álvaro S. Lima
Keyword(s):  
Ionic Liquids ◽  
Environmentally Friendly ◽  
Two Phase ◽  
Separation Processes ◽  
High Purification ◽  
Aqueous Two Phase Systems ◽  
Phase Systems ◽  
Lipase Purification

Ionic liquids as adjuvant in aqueous two-phase systems (ATPS) are efficient, environmentally friendly, and “biocompatible” separation processes, which allow the high purification of enzymes.

Aqueous two‐phase systems based on deep eutectic solvents and their application in green separation processes

2019 ◽  
Vol 43 (1) ◽  
pp. 348-359 ◽  
Author(s):  
Rong‐tao Zhao ◽  
Dong Pei ◽  
Pei‐liang Yu ◽  
Jan‐teng Wei ◽  
Ning‐li Wang ◽  
...  
Keyword(s):  
Deep Eutectic Solvents ◽  
Two Phase ◽  
Separation Processes ◽  
Aqueous Two Phase Systems ◽  
Phase Systems ◽  
Green Separation

Ionic liquid-based aqueous two-phase systems and their applications in green separation processes

2010 ◽  
Vol 29 (11) ◽  
pp. 1336-1346 ◽  
Author(s):  
Zhiyong Li ◽  
Yuanchao Pei ◽  
Huiyong Wang ◽  
Jing Fan ◽  
Jianji Wang
Keyword(s):  
Ionic Liquid ◽  
Two Phase ◽  
Separation Processes ◽  
Aqueous Two Phase Systems ◽  
Phase Systems ◽  
Green Separation

Nucleophilic degradation of diazinon in thermoreversible polymer–polymer aqueous biphasic systems

2021 ◽  
Vol 23 (7) ◽  
pp. 4133-4140
Author(s):  
Daniela Millan ◽  
Mafalda R. Almeida ◽  
Ana F. C. S. Rufino ◽  
João A. P. Coutinho ◽  
Mara G. Freire
Keyword(s):  
Reaction Products ◽  
Two Phase ◽  
Separation Processes ◽  
Aqueous Biphasic Systems ◽  
Aqueous Two Phase Systems ◽  
Phase Systems ◽  
Aqueous Biphasic ◽  
Biphasic Systems

Polymer–polymer aqueous two-phase systems involve thermoreversible reaction–separation processes in the nucleophilic degradation of diazinon and further separation of the reaction products.

Calculation of NaCl, KCl and LiCl Salts Activity Coefficients in Polyethylene Glycol (PEG4000)–Water System Using Modified PHSC Equation of State, Extended Debye–Hückel Model and Pitzer Model

2016 ◽  
Vol 41 (3) ◽  
Author(s):  
Azam Marjani
Keyword(s):  
Polyethylene Glycol ◽  
Equation Of State ◽  
Activity Coefficients ◽  
Salt Water ◽  
Water System ◽  
Pitzer Model ◽  
Biological Engineering ◽  
Statistical Parameters ◽  
Two Phase ◽  
Separation Processes

AbstractFor biomolecules and cell particles purification and separation in biological engineering, besides the chromatography as mostly applied process, aqueous two-phase systems (ATPS) are of the most favorable separation processes that are worth to be investigated in thermodynamic theoretically. In recent years, thermodynamic calculation of ATPS properties has attracted much attention due to their great applications in chemical industries such as separation processes. These phase calculations of ATPS have inherent complexity due to the presence of ions and polymers in aqueous solution. In this work, for target ternary systems of polyethylene glycol (PEG4000)–salt–water, thermodynamic investigation for constituent systems with three salts (NaCl, KCl and LiCl) has been carried out as PEG is the most favorable polymer in ATPS. The modified perturbed hard sphere chain (PHSC) equation of state (EOS), extended Debye–Hückel and Pitzer models were employed for calculation of activity coefficients for the considered systems. Four additional statistical parameters were considered to ensure the consistency of correlations and introduced as objective functions in the particle swarm optimization algorithm. The results showed desirable agreement to the available experimental data, and the order of recommendation of studied models is PHSC EOS > extended Debye–Hückel > Pitzer. The concluding remark is that the all the employed models are reliable in such calculations and can be used for thermodynamic correlation/predictions; however, by using an ion-based parameter calculation method, the PHSC EOS reveals both reliability and universality of applications.

scholarly journals Master Curve of Separation Processes

2004 ◽  
Vol 13 (1) ◽  
pp. 1-13
Author(s):  
E. Barsky ◽  
M. Barsky
Keyword(s):  
Solid Phase ◽  
Physical Phenomenon ◽  
Analytic Solutions ◽  
Solid Particles ◽  
Medium Size ◽  
Main Process ◽  
Two Phase ◽  
Separation Processes ◽  
Fraction Solid ◽  
Empirical Regularities

Processes of gravity classification involve complex two-phase flows with a multiple-fraction solid phase. Analytic solutions are still lacking for mass processes that comprise solid particles moving in different directions. Consequently, research on gravity classification has been restricted to the study of empirical regularities. This article presents the latest results in this area. Basic to these results is a new physical phenomenon that has been found to apply to the entire class of gravity separation processes – equivalency of the recoveries of the different particulate fractions. In the turbulent zone this regularity is invariant under the main technological factors of the process: flow velocity of the medium, size and density of the particles, density of the medium, concentration of the solid phase. A method has been found for transforming the main process parameters in the laminar and transitional zones to yield identical correlations. This points to the existence of an underlying law governing the process.

SYNTHESIS OF HYDROGEN IN ACOUSTOPLASMA DISCHARGE IN A LIQUID-PHASE STREAM

2019 ◽  
pp. 42-48 ◽  
Author(s):  
N. A. Bulychev
Keyword(s):  
Liquid Phase ◽  
Organic Compounds ◽  
Electrode Materials ◽  
Solid Phase ◽  
Plasma Discharge ◽  
Raw Material ◽  
Two Phase ◽  
Reduced Pressure ◽  
External Power Source ◽  
Phase Medium

In this paper, the plasma discharge in a high-pressure fluid stream in order to produce gaseous hydrogen was studied. Methods and equipment have been developed for the excitation of a plasma discharge in a stream of liquid medium. The fluid flow under excessive pressure is directed to a hydrodynamic emitter located at the reactor inlet where a supersonic two-phase vapor-liquid flow under reduced pressure is formed in the liquid due to the pressure drop and decrease in the flow enthalpy. Electrodes are located in the reactor where an electric field is created using an external power source (the strength of the field exceeds the breakdown threshold of this two-phase medium) leading to theinitiation of a low-temperature glow quasi-stationary plasma discharge.A theoretical estimation of the parameters of this type of discharge has been carried out. It is shown that the lowtemperature plasma initiated under the flow conditions of a liquid-phase medium in the discharge gap between the electrodes can effectively decompose the hydrogen-containing molecules of organic compounds in a liquid with the formation of gaseous products where the content of hydrogen is more than 90%. In the process simulation, theoretical calculations of the voltage and discharge current were also made which are in good agreement with the experimental data. The reaction unit used in the experiments was of a volume of 50 ml and reaction capacity appeared to be about 1.5 liters of hydrogen per minute when using a mixture of oxygen-containing organic compounds as a raw material. During their decomposition in plasma, solid-phase products are also formed in insignificant amounts: carbon nanoparticles and oxide nanoparticles of discharge electrode materials.

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