Patent ID: 6569399
Filing Date: 2003-05-27
Classification: B01J,C01F,C01P,C04B,C07C

Abstract:
A process for producing high-purity magnesium hydroxide comprising reacting magnesium compounds metal and/or reactive magnesium compounds with at least one hydroxy reactant having the formula:R1â€”Aâ€”Râ€”OHâ€ƒâ€ƒ(I) optionally jointly together with up to 50 percent by weight of one or more alcohol reactants having the formula:R2â€”OHâ€ƒâ€ƒ(II) wherein(a) A represents an element of Group VIA or Group VA of the Periodic Table, wherein if A represents an element of Group VA, A contains additional substituents selected from the group consisting of R1 and hydrogen; (b) R and R1 represent a branched or unbranched, cyclic or acyclic, saturated, unsaturated, or aromatic hydrocarbon residue having from 1 to 10 carbon atoms, wherein R and R1 may be different from each other and R is twofold substituted; and (c) R2 represents a branched or unbranched, cyclic or acyclic, saturated, unsaturated, or aromatic hydrocarbon residue having from 1 to 10 carbon atoms to form dissolved magnesium alkoxides; separating less soluble impurities from said liquid and/or dissolved magnesium alkoxides prior to hydrolysis; and subsequently hydrolyzing said magnesium alkoxides in the substantial absence of solvents other than any remaining reactants to form magnesium hydroxides containing less than 50 ppm sodium, less than 50 ppm calcium, and having a uniform pore size distribution.