Reaction Of Magnesium Chloride Research Articles

The Kinetics of Magnesium Carbonate Crystallization for Traditional Salt Production Wastewater Recovery

The kinetics of crystallization of magnesium carbonate (nesquehonite) at room temperature (27°C) has been examined using an electrical conductivity method during process of nucleation. Magnesium carbonate hydrate from a reaction of magnesium chloride (MgCl2) and sodium carbonate (Na2CO3) in supersaturated condition was analyzed. Variations of batch reactor experimental are magnesium chloride initial concentration (500-3.000 mg/L) and operating pH (8-14). In this paper, we studied the crystallization kinetics of magnesium carbonate via an electrical conductivity method, a concentration monitoring method. By monitoring electrical conductivity during the solution reaction process, changes in [Mg2+] can be measured and an induction period of nucleation could be determined. Crystal has been formed was confirmed with powder X-ray Diffractometer (XRD) analyses. The results show that magnesium carbonate is formed during operating condition pH 10 with magnesium chloride initial concentration 3.000 mg/L. The nucleation process of magnesium carbonate crystallization can be represented by second-order reaction equation with R2 is 0.8. The induction period of magnesium carbonate crystallization is 50 second.

An isolable magnesium diphosphaethynolate complex.

The reaction of magnesium chloride with two equivalents of sodium phosphaethynolate, Na[OCP]·(dioxane)2.5 (1), yields a magnesium diphosphaethynolate complex, [(THF)4Mg(OCP)2] (3). The formation of compound 3 goes through a monosubstituted chloromagnesium phosphaethynolate Mg(OCP)Cl (2). The structure of 3 was determined via a single crystal X-ray diffraction study. For comparison, we also report the structure of a monomeric sodium phosphaethynolate complex, [Na(OCP)(dibenzo-18-crown-6)] (4).

Experimental study of the effect of zeolite 4A treated with magnesium hydroxide on the characteristics and gas‐permeation properties of polysulfone‐based mixed‐matrix membranes

ABSTRACTNowadays, new methods for gas‐separation processes are being quickly developed. The separation of CH4/CO2 and CH4/H2 is usually the subject of most related research studies, especially in the membrane gas‐separation process, because of their important role in industry. In this study, we attempted to improve the separation properties of a polysulfone/zeolite 4A mixed‐matrix membrane by modifying the zeolite particle surface. The method included a simple ion‐exchange reaction of magnesium chloride with ammonium hydroxide that yielded the formation and precipitation of magnesium hydroxide whiskers on the surface of the zeolites. The whiskers could omit most of the nonselective voids by interlocking the polymer chains through them and, consequently, improve the permeability, selectivity, and elastic modulus of the membranes. X‐ray diffraction, energy‐dispersive X‐ray spectroscopy, scanning electron microscopy (SEM), Fourier transform infrared spectroscopy, and dynamic mechanical analysis proved all the changes recorded after the particle and membrane treatments. SEM images showed the petal‐like morphology of the whiskers that formed on the surface of the particles after the reaction against the smooth surface of the untreated zeolite. At a 30 wt % loading of particles in the polymeric matrix, the selectivities for H2/CH4 and CO2/CH4 increased by 69 and 56%, respectively; in contrast, the H2 and CO2 permeabilities decreased by 2.5 and 10%, respectively. The modulus of elasticity for the treated membrane also increased by 14 and 30% compared to those of the pure and untreated membranes, respectively. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 44329.

Preparation and Luminescence Properties of Two Novel Magnesium Complex Materials

In order to prepare efficient luminescence material, two kinds of novel magnesium luminescence materials were synthesized by the reaction of magnesium chloride with 2-acetyl-1-naphthol-diethylenetriamine (1) and 2-acetyl-1-naphthol-triethylenetetramine (2), respectively. The luminescent properties of two novel magnesium luminescence materials were investigated in solid and in DMSO solutions. The results show that two magnesium luminescence materials have high blue. The DMSO solvent could enhance the luminescence of complex (1), and also quench the luminescence of complex (2).

Crystal structure of two cocrystallized complexes obtained from the reaction of magnesium chloride with 2,4-pentanedione

The crystal structures of two cocrystallized complexes of MgCl2 with 2,4-pentanedione have been determined. The conglomerate crystallizes in the monoclinic system, space groupP 21/c (No. 14);a=7.835(2),b=18.169(4),c=13.303(3) A, β=90.70(2)°,Z=4. The former complex is a dimer which consists of two octahedra sharing one edge by two chlorine bridges between the metal atoms. The chelate ring in the equatorial plane and two apical water molecules realize the coordination polyhedron around each Mg atom. In the latter complex the metal lies at the center of a slightly distorted octahedron formed by six oxygens, four from two chelate ligands and two from apical water molecules.