We present different models arising in chemical engineering and essentially related to isothermal gas chromatography. These models describe a fixed bed adsorption process of separation of a gaseous mixture: each compound can exist either in a mobile phase or a solid and static one, with a finite or infinite mass-exchange kinetics. Many authors, in the fields of chemical engineering and mathemat...

Differentiation between human and animal remains by means of analysis of volatile compounds released during decomposition is impossible since no volatile marker(s) specific for human decomposition has been established today. Hence, the identification of such a marker for human decomposition would represent great progression for the discovery of buried cadavers by analytical techniques. Cadaver ...

A novel complex of elfamycin-type antibiotics has been isolated from submerged fermentation of either Streptomyces violaceoniger AB 999F-80 or Streptomyces violaceoniger AB 1047T-33. Antibiotics were extracted from the fermentation broth with ethyl acetate and from the mycelia with acetone. Purification of individual components was achieved by a combination of solvent partitions, Sephadex LH-20...

Structural and surface properties of chromatographic porous silica, alumina, titania and zirconia were studied using thermogravimetry and nitrogen adsorption. The samples studied are mesoporous and exhibit relatively narrow pore size distributions in the range from 10 to 30 nm, making them suitable for chromatographic applications. Low-pressure nitrogen adsorption and thermogravimetry were used...

Pseudophase liquid chromatography was used to measure the thermodynamic parameters governing adsorption of organic molecules from the surfaces of carbonaceous particles into liposomal zwitterionic mobile phases. These mobile phases contain many of the important physicochemical parameters of alveolar surfactant. Results show that physical desorption into model surfactant will be dependent upon t...

Surfactants and their mixtures can drastically change the interfacial properties and hence are used in many industrial processes such as dispersion/flocculation, flotation, emulsification, corrosion inhibition, cosmetics, drug delivery, chemical mechanical polishing, enhanced oil recovery, and nanolithography. A review of studies on adsorption of single surfactant as well as mixtures of various...

Honeycomb rotor dehumidifiers have been used widely because of large surface area and rapid thermal response. Mass and heat transfer behavior for the performance evaluation is rather 10 complicated and a system of simultaneous partial differential equations of 8 variables must be solved under a cyclic initial condition for the complete simulation. With high efficienc...

a new category of hybrid organic-inorganic zirconium phosphonate, zr[(o3pch2)2nc6h4co2h].2h2o was synthesized and the applicability of the prepared sorbent as an ion-exchanger for removal of ni2+, cu2+ and zn2+ from aqueous solutions was evaluated. the characterization of the synthesis product was done using tg-dtg, sem, xrd, ft-ir techniques. study of the sorption isotherms and its kinetic par...