Poly (phenylene-ether-ether) sulfone membrane was fabricated and characterized by efficient glycerol/biodiesel separation produced from waste cooking oils trans-esterification. The membrane preparation was processed by phase inversion technique. The morphology, Physico-chemical properties and separation behavior of membranes were studied at various PPEES concentration. A uniform surface was...

an on-line uv-hplc / apci-ms (atmospheric pressure chemical ionization) tandem by a platinium c18 column with an isocratic solvent system after optimizing was applied to the separation and the identification of different carotenoids including astaxanthin, canthaxanthin, apocarotenoic ester, torularhodin and beta carotene. this method was used to identify particular carotenoids produced by newly...

background: chemical preservation has become an increasingly important practice in modern food technology and herbal medicinal products with the increase in production of processed and convenience products. objective: in the present study, a reversed-phased hplc method for simultaneous determination of the preservatives sodium benzoate (sb) and potassium sorbate (ps) is described. methods: the ...

in this research, some more applicable ferrofluids are produced and their mechanical specifications are measured, experimentally. also, their treatments in the ventilated cavity geometry are assessed numerically. the magnetite nanoparticles are produced by a chemical combination of fe2+ and fe3+ with nh3. in order to solve the nanoparticles in the new mediums, a proper coating is added to them....

this field study was conducted on 60 women who working in related centers of universities of medical sciences in tehran. data gathering tool was maternal separation anxiety questionnaire that designated by hock & et al. (1982).  findings revealed that majority of the research units (71.7%), have high degree of maternal separation anxiety. mean degree of maternal separation anxiety was (21.22±3....

The separation and quantification of glycosaminoglycan (GAG) chains with different levels of sulfation from cells and media, and prepared through chemoenzymatic synthesis or metabolic engineering, pose a major challenge in glycomics analysis. A method for microscale separation and quantification of heparin, heparan sulfate, and heparosan from cells is reported. This separation relies on a mini ...

Now that many scientific investigations focus on ionic liquids (IL) to establish their potential in different chemical processes, their application for the separation of various classes of compounds in capillary electrophoresis has also been recognized. ILs have been used as background electrolytes in aqueous and non-aqueous capillary electrophoresis for the separation of a number of different ...

Using the formalism of rigorous statistical mechanics, we study the phenomena of phase separation and freezing-point depression upon freezing of solutions. Specifically, we devise an Ising-based model of a solvent–solute system and show that, in the ensemble with a fixed amount of solute, a macroscopic phase separation occurs in an interval of values of the chemical potential of the solvent. Th...

The paper presents a new approach to chemical process synthesis, case-based reasoning (CBR). CBR is based on the reuse of proven process solutions, which are used for solving new problems. Examples are given to demonstrate the principles of conceptual reasoning of separation systems. The phases of reasoning in this application are: the search for specific separation methods for a single separat...