Results 261 to 270 of about 106,957 (303)

Mass transfer modelling for solvent dehydration by pervaporation

Separation and Purification Technology, 2000
Abstract A set of equations for design and optimisation of solvent dehydration by pervaporation is developed based on a model of mass transport through membranes that permeate preferentially water. This model assumes a mechanism of sorption–diffusion–desorption and introduces a diffusion coefficient which is dependent on the membrane water ...
Jorge Miguel Neto, Maria Norberta Pinho
openaire   +1 more source

Membranes for the dehydration of solvents by pervaporation

Journal of Membrane Science, 2008
Abstract This review aims at summarizing the main research carried out up to 2007 in hydrophilic pervaporation. Both polymeric and inorganic membranes are examined and the dehydration of alcohols such as ethanol and isopropyl alcohol covered in depth. When considering polymeric membranes, the research has been categorised into sections based upon the
Peter D. Chapman, Teresa Oliveira, Andrew G. Livingston, K. Li   +3 more
openaire   +1 more source

Module arrangement for solvent dehydration with silica membranes

Desalination, 2004
Abstract This simulation study investigated the influence of operating parameters and module and system design on performance and cost of pervaporation modules. It was based on isopropanol dewatering measurements with silica membranes and different types of methods to calculate heat and mass transfer resistance. It was shown that conventional modules
Michael Schleger, Stefan Sommer, Thomas Melin   +2 more
openaire   +1 more source

Solvent effect in H-BEA catalyzed cyclohexanol dehydration reaction

The Journal of Chemical Physics
The solvent effect on H-BEA catalyzed cyclohexanol dehydration was investigated in water, dioxane, and cyclohexanol. The dynamic evolution of the Brønsted acid site of zeolite and its interaction with reactant molecules in different solvents were explored with ab initio molecular dynamics simulations, providing reliable configuration sampling to obtain
Sha Li, Huimin Chen
openaire   +2 more sources

Solvent-dehydrated dermal allograft (AXIS™) augmented cystocele repair: longitudinal results

International Urogynecology Journal, 2016
Surgical repair options for pelvic organ prolapse (POP) include native tissue, allograft, xenograft, and synthetic grafts. Solvent-dehydrated dermal allograft (SDDG) has an improved safety profile. We evaluated the long-term safety and efficacy of SDDG use for cystocele repair.A total of 184 patients completed a minimum follow-up of 12 months ...
Saad, Juma, Omer A, Raheem
openaire   +2 more sources

Development of soft-sensor for solvent dehydration tower

Fifth World Congress on Intelligent Control and Automation (IEEE Cat. No.04EX788), 2004
A soft-sensor using measurement of temperature distribution along the column to predict the compositions of the distillate and bottom products of the solvent dehydration tower is developed. With the distributed control system and offline measurement of the compositions, a recursive least-squares method is proposed to automatically correlate the ...
null Lingyu Zhu, null Xi Chen
openaire   +1 more source

Solvent-dehydrated fascia lata allograft for covering intraoral defects: Our experience

Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology, and Endodontology, 2007
Mucosal defects in the oral cavity as a result of tumors, preprosthetic surgical procedure, or trauma are always a concern for surgeons. The aim of this study is to present our experience and discuss the advantages and problems arising with the use of solvent-dried human fascia lata allografts in oral mucosal defects, thus evaluating its clinical ...
Veronica, Papakosta, Constantinos, Mourouzis, Constantinos, Komis, Theodosios, Saranteas, George, Rallis   +4 more
openaire   +4 more sources

Microwave-enhanced dehydration and solvent washing purification of penicillin G sulfoxide

International Journal of Pharmaceutics, 2001
In the present study, a new microwave-enhanced dehydration and solvent washing purification of penicillin G sulfoxide technique has been developed. The results show that microwave irradiation can dehydrate penicillin G sulfoxide from a water content of 14-26 to below 0.5% in 40-60 min in N2 or air.
X, Pan, H, Liu, Z, An, J, Wang, G, Niu
openaire   +2 more sources

Breakthrough in pervaporation membrane for dehydration of solvent streams [PDF]

NPT procestechnologie, 2008
After several years of development, researchers at the Universities of Twente and Amsterdam and the Energy research Centre of the Netherlands have succeeded in obtaining a membrane system which is hydrothermally stable under semi-industrial dehydrating conditions at elevated tempreature.
Elshof, J.E. ten, Brinkman, H.W.
openaire   +2 more sources

Solvent extraction of Fe(III) by dehydrated castor oil fatty acids

Talanta, 1990
The effect of temperature on the extraction of FE(III) by dehydrated castor oil fatty acids (DCOFA) has been studied in the temperature range 283-313 K at 1.0M constant ionic strength (NaClO(4)). The temperature dependence of the conditional constant of extraction is given in the form: ln K(ext)=31.95 - 12800(1/T).
O, Fatibello-Filho, M A, Bumba, J C, Trofino, E A, Neves   +3 more
openaire   +2 more sources