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Ni@diaza crown ether complex supported on magnetic nanoparticle was provided by grafting technique. The catalytic activity of Fe3O4@diaza crown ether@Ni was explored through one‐pot synthesis of 2,3‐dihydroquinazolin‐4(1H)‐ones and it was used as an efficient and recoverably constant nanocatalyst. FT‐IR, SEM, TEM, XRD, BET, ICP, EDS, and TGA techniques were employed to specify the nanocatalyst. This heterogeneous catalyst demonstrated acceptable recyclability and could be used again several times with no considerable loss of its catalytic activity.

Liquid-liquid equilibrium data of three systems containing surfactant polyoxyethylene cetyl ether (with abbreviation name Brij 58) and three salts, (NH 4 ) 2 HPO 4 , NH 4 H 2 PO 4 , and KH 2 PO 4 , were measured at 298.15 K. Then the binodal curves were described using two three-parameter equations and the tie lines were described using four two-parameter equations. The best equations to correlate the binodal curves and the tie lines for these systems have been reported. Additionally, the effects of the salt type on the phase diagrams have been discussed.

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