Preparation of MgOHCl by controlled dehydration of MgCl2·6H2O

Kinetics of MgO chlorination with HCl gas

“…[9] Thereafter, the MgOHCl that was produced was analyzed with X-ray diffraction (XRD) and the McGill speciation technique [10] to assure the quality of the produced material. The XRD spectrum of the present MgOHCl has been published elsewhere, [1] and the MgOHCl was found to contain less than 5 wt pct of other material that was mostly MgO.…”

“…overpredicts the conversion, which in practice may be due to the rapid outward evolution of H 2 O gas interfering with the inward transfer of the HCl arising from the fast chlorination of MgO at high temperature, Reaction [1]. In any event, despite the lack of fit during the transition period at the highest temperature, the model accurately fitted the conversion at the end of all the tests, which is the most important point in the design of an industrial anhydrous MgCl 2 production process.…”

“…[1] In the present work, the MgOHCl so produced was leached and washed with methanol to separate any residual soluble magnesium chloride or magnesium chloride hydrates from the insoluble MgOHCl that was formed. [9] Thereafter, the MgOHCl that was produced was analyzed with X-ray diffraction (XRD) and the McGill speciation technique [10] to assure the quality of the produced material.…”

“…If present, these oxides need to be chlorinated, and when the chlorinating agent is HCl gas, the chlorination reactions are as follows: [1] [2]…”

“…Recent work by authors [1] found that under certain conditions, MgOHCl can be the dominant oxide species produced during the dehydration of MgCl 2 и6H 2 O and that fine MgO can be formed by the thermal decomposition of MgOHCl 2 ; i.e., [3] MgOHCl ϭ MgO ϩ HCl The kinetics of the chlorination of MgO have been studied by a number of researchers. Ishii et al [3] studied the chlorination of MgO by Cl 2 gas in the presence of carbon in the temperature range from 25 °C to 970 °C.…”