Abstract: A process for removing at least Ca2+ and Mg2+ from a lithium-containing brine. The process comprises (i) providing an aqueous lithium-containing brine feed comprising dissolved Ca2+ and Mg2+ impurities in a weight ratio of Li+:Ca2+ of about 4:1 to 50:1 wt/wt and in a weight ratio of Li+:Mg2+ of about 4:1 to 50:1; (ii) subjecting said brine feed to nanofiltration to produce a lithium-containing permeate from which Ca2+ and Mg2+ components are being removed concurrently; and (iii) conducting the nanofiltration so that a separation occurs and a retentate solution is formed with a total amount of Ca2+ and Mg2+ of at least 75% of the total amount of Ca2+ and Mg2+ in the original aqueous lithium-containing brine feed and forming an aqueous lithium-containing permeate solution in which the total content of dissolved Ca2+ and Mg2+ is decreased to 25% or less as compared to the original aqueous lithium-containing brine feed.

Abstract: This invention relates to a process for the production of tetrabromobisphenol-A by the bromination of bisphenol-A, which process features: (a) feeding to a reaction mass (i) bisphenol-A and (ii) a stream of gaseous bromine, the gaseous stream having a Reynold's No. .gtoreq.40,000; (b) the reaction mass containing from about 50 to about 20,000 ppm unreacted bromine and less than 20 wt % HBr; and (c) the reaction mass having precipitated therefrom tetrabromobisphenol-A, all of (a)(ii), (b) and (c) occurring during the bisphenol-A feed.