Membrane extraction process parameters

Ho et al. - and Stroeve and Varanasi have developed sophisticated mathematical models of liquid-membrane transport. These models are of useful theoretical interest and provide some important insights into the most important parameters affecting the rate and efficiency of liquid-membrane extraction process. 

The influence of donating solution acidity on membrane extraction process efficiency is one of the important factors determining the possibility of extraction system application in manufacturing technologies. The influence of this parameter of membrane process with the presence of carriers 1, 2, and 4 under their concentration in membrane phase O.lmol L by the example ofNd transfer from solutions containing different HNO3 concentrations has been studied. 

The ideal aortic valve bioprosthesis would consist of a collagen-elastin matrix. Lack of success in achieving such a system has been attributed to factors such as calcification and degradation. Calcification may be due to the cell membrane and / or the glutaraldehyde treatment. It is important to be able to remove cellular remnants and maintain the structural integrity of this collagen-elastin matrix. To mimic the properties of the aortic valve, an extraction process was developed [40]. The authors [40] investigated the effect of sodium dodecyl sulphate (SDS) and Triton-X 100 and cholate on the structural parameters of this extracellular matrix. 

Mathematical modeling and determination of the characteristic parameters to predict the performance of membrane solvent extraction processes has been studied widely in the literature. The analysis of mass transfer in hollow fiber modules has been carried out using two different approaches. The first approach to the modeling of solvent extraction in hollow fiber modules consists of considering the velocity and concentration profiles developed along the hollow fibers by means of the mass conservation equation and the associated boundary conditions for the solute in the inner fluid. The second approach consists of considering that the mass flux of a solute can be related to a mass transfer coefficient that gathers both mass transport properties and hydrodynamic conditions of the systan (fluid flow and hydrodynamic characteristics of the manbrane module). 

With the assumptions mentioned above two main parameters will be necessary in the description of the separation-concentration process of one solute, that is, the membrane mass transport coefficient and the equilibrium parameter of the extraction interfacial reaction. 

Native soy protein isolate may be produced by ultrafiltration of an aqueous extract of defatted soy bean meal, Q), (5 ). The process layout is shown in Fig. 1. A careful selection of membrane parameters such as flow velocity, pressure drop, temperature, and of the type of membrane and modules is important in order to obtain a bean protein isolate by a direct ultrafiltration of the clarified extract ( 5). The protein isolate has a protein-dry matter ratio higher than 90% (N x 6.25), when using this process. 

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