Results 241 to 250 of about 546,844 (290)

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

Pervaporative Dehydration of Organic Solvents

Separation Science and Technology, 1997
Pervaporative separation of acetone/water and isopropanol (IPA)/water systems has been studied in the water-lean range of composition of the feed mixtures. Poly(vinyl alcohol) (PVA) membranes crosslinked with citric acid, adipic acid, maleic acid, glutaraldehyde, and glyoxal were used for this purpose.
M. C. Burshe, S. A. Netke, S. B. Sawant, J. B. Joshi, V. G. Pangarkar   +4 more
openaire   +1 more source

The solvent-free thermal dehydration of tetritols on zeolites

Carbohydrate Research, 2000
A new alditol dehydration method at high temperatures, in the presence of molecular sieves without solvent in an argon atmosphere, is described. Investigations on tetritols have been carried out. Products arising after the intramolecular and intermolecular elimination of water, with retention or inversion of the configuration of asymmetric carbon atoms,
M, Kurszewska, E, Skorupa, R, Kasprzykowska, P, Sowiński, A, Wiśniewski   +4 more
openaire   +2 more sources

Densities of collagen dehydrated by some organic solvents

Experientia, 1966
Der Einfluss von organischen Losungsmitteln auf die Dichteveranderungen des Kollagens wurde gepruft. Methanol und Butanol fuhrt zur Strukturauflockerung, Aceton und Dioxan zur Strukturverdichtung.
V, Podrazký, V, Sedmerová
openaire   +2 more sources

Solvent-Dehydrated Calvarial Allografts in Craniofacial Surgery

Plastic and Reconstructive Surgery, 2004
Craniofacial surgery almost always requires the use of bone grafting. Although autografts are the standard procedure for bone grafting, it is sometimes not possible to harvest bone, and autografts have particular risks. The use of allograft bone provides a reasonable alternative to meet the need for graft material.
Vargel, I, Erk, Y, Benli, K, Ruacan, S, Cila, A, Mavili, E, Tuncbilek, G   +6 more
openaire   +3 more sources

The solvent-free thermal dehydration of hexitols on zeolites

Carbohydrate Research, 2002
Dehydration of galactitol, D-glucitol and D-mannitol at high temperature in the presence of molecular sieves without solvent under an argon atmosphere is described. Cyclodehydration products with retention or inversion of the configuration at asymmetric carbon atoms, were observed. Reaction of galactitol yielded racemic 1,4-anhydrogalactitol in a first
Maria, Kurszewska, Eugenia, Skorupowa, Janusz, Madaj, Antoni, Konitz, Wiesław, Wojnowski, Andrzej, Wiśniewski   +5 more
openaire   +2 more sources

Solvent Dehydration and Separation of Native Asphalt

Chemistry and Technology of Fuels and Oils, 2001
A combined process for dehydration, deasphalting, and acetone fractionation of Ashal'chinsk native asphalt was developed and investigated. Technology was proposed for combined solvent preparation and separation of natural asphalt and the basic characteristics of the process were determined.
A.Yu. Kopylov, V. G. Kozin, I. Sh. Khusnutdinov   +2 more
openaire   +1 more source

Solvent‐Free Thermal Dehydration of Pentitols on Zeolites

Journal of Carbohydrate Chemistry, 2004
Abstract Dehydration of D‐arabinitol, ribitol, and xylitol at high temperature in the presence of molecular sieves without solvent in an argon atmosphere is described. Products arising after the dehydration–cyclization (cyclodehydration) reaction with retention or inversion of the configuration of asymmetric carbon atoms, were observed.
Maria Kurszewska, Eugenia Skorupowa, Janusz Madaj, Andrzej Wiśniewski   +3 more
openaire   +2 more sources

Absorption-assisted pervaporation for solvent dehydration

Desalination, 2002
A novel process configuration for pervaporation and vapor permeation is presented. In this process the permeation driving force is realized by absorbing the permeate vapor into a suitable solution with a very low vapor pressure. The refrigeration needed for condensation in the conventional process can be overcome and cost savings could be achieved ...
Alaa Fahmy, Dieter Mewes, Klaus Ohlrogge
openaire   +1 more source

Solvent Dehydrated Costal Cartilage: Evaluation in a Rabbit Model

Journal of Craniofacial Surgery, 2005
An experimental study has been performed on 30 New Zealand rabbits to compare autogenous cartilage harvested from the rabbits' auricles, bone graft harvested from the iliac crest of the rabbits, and the commercially available solvent dehydrated human costal cartilage (SDHCC) grafts, each measuring 1 x 1 cm.
Sokmensuer, LK, Sokmensuer, C, Kankaya, Y, Arslan, C, Uysal, A, Kocer, U, Sungur, N   +6 more
openaire   +3 more sources