PROCESSES FOR CONJOINTLY PRODUCING BROMINE AND CALCIUM CHLORIDE

摘要

Processes are provided for conjointly producing Br₂ and a concentrated aqueous solution containing at least about 5 wt% CaCI₂, based on the weight of the concentrated aqueous solution, from an HBr-rich recycle stream and a feed brine dilute in CaCI₂. wherein the aqueous HBr-rich stream is produced from an HBr-rich recycle stream and a portion of the feed brine. Such processes can comprise feeding the HBr-rich recycle stream and a liquid comprising a portion of the feed brine, either together or separately to an HBr absorption tower; producing an aqueous HBr-rich stream in the HBr absorption tower; feeding the aqueous HBr-rich stream and, optionally, a portion of the feed brine to a bromine tower; oxidizing bromide moieties within the bromine tower with CI₂ to produce Br₂; recovering Br₂ from the bromine tower; removing a bromide- depleted bottoms from the bromine tower, such bottoms containing HCI; adding a Ca++ source to the bromide-depleted bottoms to convert substantially all of the HCI in the bottoms to CaCI₂, and, as necessary, removing water from the treated bottoms to produce the concentrated aqueous solution.