A comprehensive study on the effect of hydrotropes such as urea, citric acid, sodium salicylate, and nicotinamide on the separation of phenol from phenol/o-chlorophenol mixtures under a wide range of ...hydrotrope concentrations, (0 to 3.0) mol·L−1, and different system temperatures, (303 to 333) K, has been undertaken. The performance of hydrotropes toward separation of phenol was measured in terms of the Setschenow constant K S. A Minimum Hydrotrope Concentration (MHC) in the aqueous phase was found essential to initiate significant separation of phenol from the phenol/o-chlorophenol mixture. The maximum enhancement factor which is the ratio of the percentage extraction value in the presence and absence of a hydrotrope has been determined for each case.
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The use of nicotinamide ``3-pyridineamide'' as an iron corrosion inhibitor was tested in aerated aqueous solutions of NaCl and $Na_2SO_4$ for different pH values. Polarization resistance $(R_p)$ ...measurements, polarization curves and AC impedance spectroscopy techniques were used to obtain experimental data. Nicotinamide (ND) was found to exhibit a cationic-type inhibitor behaviour in acidic solution of NaCl (pH 3) and also a weak inhibitory effect in acidic sulphate solution (pH 3). The impedance spectra at open circuit potential showed that the corrosion process of the metal was characterized by two distinguishable capacitive loops. The charge transfer resistance $(R_t)$ and the polarization resistance $(R_p)$ values calculated from the interpretation of Nyquist plots were in agreement with the results of the other techniques.
Nicotinamide-acetylsalicylato complexes of Co(II), Ni(II), Cu(II), and Zn(II) were synthesised and their structural properties
were investigated by employing elemental analysis, magnetic ...susceptibilitiy, solid state UV-vis, direct injection
probe mass, FTIR and thermoanalytic TG-DTG methods. It was found that ratio of metal:ligand:ligand is 1:2:2 and the
decomposition of each complex starts with dehydration and follows by decomposition of the nicotinamide and acetylsalicylato,
respectively. The thermal dehydration of the complexes takes place in steps from one to two. The decomposition
mechanism and thermal stability of the investigated complexes are interpreted in terms of their structures. The
final decomposition products are found to be the respective metal oxides
