scholarly journals Phosphoric acid recovery from concentrated aqueous feeds by a mixture of di-isopropyl ether (DiPE) and tri-n-butylphosphate (TBP): extraction data and modelling

RSC Advances ◽  
2017 ◽  
Vol 7 (12) ◽  
pp. 6922-6930 ◽  
Author(s):  
M. Campos Assuncao ◽  
G. Cote ◽  
M. Andre ◽  
H. Halleux ◽  
A. Chagnes
Keyword(s):  
Experimental Data ◽  
Phosphoric Acid ◽  
Volume Ratio ◽  
Isopropyl Ether ◽  
Phase Volume ◽  
Phase Volume Ratio ◽  
Acid Recovery ◽  
C Distribution

This paper reports experimental data and modelling about the extraction of H3PO4 from concentrated aqueous feeds (3 to 14 M) by the mixture of DiPE and TBP at 25 °C: distribution ratios of H3PO4 and water, and associated change of phase volume ratio.

scholarly journals Partitioning of cerrena unicolor laccase activity in an aqueous two-phase system

2016 ◽  
Vol 37 (2) ◽  
pp. 269-280 ◽  
Author(s):  
Michał Blatkiewicz ◽  
Axel Prinz ◽  
Andrzej Górak ◽  
Stanisław Ledakowicz
Keyword(s):  
Volume Ratio ◽  
Line Length ◽  
Bottom Phase ◽  
Phase System ◽  
Phase Volume ◽  
Two Phase ◽  
Aqueous Two Phase System ◽  
Phase Volume Ratio ◽  
Cerrena Unicolor ◽  
Tie Line

Abstract Culture supernatant containing laccase produced by Cerrena unicolor strain was used to examine laccase partitioning between phases in an aqueous two-phase system. The investigated system consisted of polyethylene glycol 3000 and sodium phosphate buffer adjusted to pH = 7. Influence of several parameters on partitioning was measured, including phase forming components’ concentrations, tie line lengths, phase volume ratio, supernatant dilution, process temperature and halogen salt supplementation. Partitioning coefficients up to 78 in the bottom phase were achieved with yields of over 90%. Tie line length and phase volume ratio had significant effect on enzyme partitioning.

The Effect of Phase Volume Ratio on Emulsion Type*

1954 ◽  
Vol 43 (2) ◽  
pp. 117-119 ◽  
Author(s):  
Rupert Salisbury ◽  
E.E. Leuallen ◽  
L.T. Chavkin
Keyword(s):  
Volume Ratio ◽  
Phase Volume ◽  
Phase Volume Ratio

Method of computing hydraulic gradient for the case of a two-phase mixture flowing in sloping pipes

2019 ◽  
Author(s):  
A.S. Kondratiev ◽  
T.L. Nha
Keyword(s):  
Solid Phase ◽  
Slope Angle ◽  
Axisymmetric Flow ◽  
Volume Ratio ◽  
Hydraulic Gradient ◽  
Transitional Region ◽  
Phase Volume ◽  
Two Phase ◽  
Phase Volume Ratio ◽  
Phase Mixture

The paper investigates two-phase mixture flows in sloping pipes employing two computational methods in the transitional region of pipe slope angle. We used methods of computing two-mixture flows in horizontal and vertical pipes as the basis for our equations. When flowing downwards through a sloping pipe, the solid phase volume ratio distribution changes most significantly: an axisymmetric flow through a vertical pipe transforms into a flow featuring a markedly non-uniform distribution of the solid phase along the vertical plane in the sloping pipe. When flowing upwards, the solid phase volume ratio profile is inversely transformed. Comparison of the experimental and computational data showed that the datasets are in a sufficiently good agreement. The computational method developed is semi-empirical and may be recommended for calculating hydraulic gradient in sloping pipes.

Study of ionizable drugs transfer across the water/ 1,2-dichloroethane interface with phase volume ratio equal to unity using a three-electrode system

2003 ◽  
Vol 48 (12) ◽  
pp. 1234-1239
Author(s):  
Meiqin Zhang ◽  
Peng Sun ◽  
Yong Chen ◽  
Fei Li ◽  
Zhao Gao ◽  
...  
Keyword(s):  
Volume Ratio ◽  
Electrode System ◽  
Phase Volume ◽  
Phase Volume Ratio

THE EFFECT OF CONCENTRATION ON THE VISCOSITY OF STARCH PASTES AND OF LYOPHILIC SOLS

1936 ◽  
Vol 14b (11) ◽  
pp. 391-403 ◽  
Author(s):  
Wilfred Gallay
Keyword(s):  
Experimental Data ◽  
Critical Concentration ◽  
Volume Ratio ◽  
Dispersed Phase ◽  
Effective Volume ◽  
Phase Volume ◽  
Chain Molecules ◽  
Residual Structure ◽  
Potato Starches ◽  
Structural Flow

The critical concentration of a starch paste is the limiting concentration above which structural flow is apparent. The inverse of the critical concentration, termed the effective volume, is the minimum volume of solution per gram of starch below which structural flow is apparent. The critical concentrations and effective volumes have been measured for series of pastes of acid-modified corn and potato starches, and the effective volume has been shown to decrease with increasing degree of modification. The specific viscosities per unit concentration of these pastes, at concentrations below the critical, increases linearly with the effective volume, and the proportionality constants found are compared with those derived from the equations of Einstein and of Hatschek. The effects of phase-volume ratio and ease of deformation of the dispersed phase on the viscosity of a system are discussed, and previous relations applied to experimental data obtained in the present instance. Residual structure below the critical concentration is discussed. Above the critical concentration, the viscosity is dependent on the rate of shear, and the equation F = KPn expresses the experimental data well, where F is the flow, P is the pressure, K and n are constants. For two starches investigated, within the range of concentrations used n has been found to increase linearly with the concentration c, dn/dc being dependent on the elasticity or deformability of the granules.The form of lyophilic colloids in solution is discussed and agreement is expressed with the conception of Haller that the long-chain molecules, owing primarily to the free rotatability of the valence linkages, are irregularly bent and tangled in solution, as opposed to Staudinger's conception of straight rigid chains. These molecules occupy on the average a form approximating to the spherical, and solvation is due chiefly to immobilization. A dextrin in solution was found to have a [Formula: see text] ratio close to that of a pasted starch, and the forms of the two are probably similar. A lyophilic sol is considered heterogeneous and similar in many respects to an emulsion, with a very highly deformable discontinuous phase. The viscosity of such a system is due to phase-volume relations, modified by the ease of deformation of the dispersed phase, and the particular characteristics of these important sols admit of explanation on this basis.

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