July 2011
Excess parameters of binary and ternary mixtures of {1-Butanol + hexylamine + n-heptane} at different temperatures and comparison with the Flory theory
In this work, we calculated (thermal expansion coefficients), (excess thermal expansion coefficients) and (isothermal coefficient of pressure excess molar enthalpy) for the binary and ternary mixtures of {1-butanol + hexylamine + n-heptane} from experimental densities (Djordjevic et al., 2010) at (288.15, 293.15, 298.15, 303.15, 308.15, 313.15, 318.15 and 323.15) K. The trends...
July 2011
A high yield synthesis of phenytoin and related compounds using microwave activation
A reaction system is described to synthesize phenytoin, a major antiepileptic drug, and structurally related compounds using a two-step approach. The first step involves the treatment of a benzil derivative by thiourea in dimethylsulfoxide (DMSO) in aqueous KOH under microwave activation. The resulting 2-thiohydantoin was then oxidized to the corresponding hydantoin using perhydrol in dimethylformamide (DMF) in acetic...
July 2011
Stabilization of manganese (Mn)-induced peroxide decomposition
Various ways were explored to reduce Mn-induced peroxide decomposition under conditions similar to industrial bleaching of mechanical pulps. It was found that hydrogen peroxide is more stable if Mn (II) or (III) are stabilized prior to peroxide addition. Sodium silicate/magnesium sulfate solution stabilized hydrogen peroxide in the presence of both Mn(II) and Mn(III), while diethylenetriamine pentaacetic acid (DTPA)...
July 2011
Identification of 3- deoxyanthocyanins from red sorghum (Sorghum bicolor) bran and its biological properties
Anthocyanins known as potent antioxidant provides attractive colours and used as an ingredient in food systems. This study aims to evaluate a potential anthocyanin extraction method from red sorghum bran and to investigate its antioxidant and cytotoxic properties. The anthocyanin content was found to be higher in acidified methanol and on separation was identified as apigeninidin and leuteolinidin, which obviously could...
July 2011
Classification of lubricants using neutron slowing-down technique
The neutron slowing down technique employing a facility based on a 1 Ci 241Am-Be neutron source base and 3He neutron detector has been used to classify lubricants. The facility utilizes the fast neutron slowing down technique in which the intensity of reflected thermalized neutrons is proportional to the hydrogen content of the sample exposed to it. A popular market product of different grades was analyzed in...
July 2011
Effect of presence of free fatty acids on the drying of oil/drying catalysts mixtures
Free fatty acids are usually generated spontaneously in oils either by action of enzymes inadvertently entrained during storage or mineral acids inherited from the refining process. The study investigated the effect of the presence of excess fatty acids on the drying/curing behaviour of drying oil admixed with drying catalysts. The oxygen absorption behaviours of Linseed oil (LSO) and rubber seed oil (RSO) on one hand,...
July 2011
Copolymerization of methylol urea with ethylol urea resin for emulsion paint formulation
In this work, copolymerization of urea formaldehyde (UF) and urea acetaldehyde (UA) was successfully carried out. Some physical properties such as gel time, viscosity, density, melting point, moisture uptake, refractive index and formaldehyde emission level were evaluated. The IR analysis of spectra from the pure amino resins and their copolymer (UF + UA) showed chemical interaction between urea formaldehyde and urea...
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