A batch process for co-producing anhydrous hydrogen bromide and a purified bisulfate
salt comprising: (a) charging a batch reactor with a bromide salt slurry, wherein
the slurry is more than 50% by weight bromide salt; (b) reacting the slurry with
sulfuric acid in a batch reaction wherein bromide salt is consumed to produce crude
aqueous hydrogen bromide and crude bisulfate salt, the crude bisulfate salt containing
bromine; (c) prior to or concurrently with step (b) adding hydrogen bromide to
the reactor; (d) purifying the crude hydrogen bromide to produce anhydrous hydrogen
bromide; and (e) removing bromine from the crude bisulfate salt to form a purified
bisulfate salt.