Solid Reactant
The Solid Reactant process is similar to the Temperature Swing Absorption process in most respects, but uses a proprietary material based on a doped metal oxide that is easily cycled between an oxide and bromide form to first capture HBr and subsequently regenerate bromine. In the Solid Reactant Process, at least two packed bed reactors containing the solid reactant operate in cyclic fashion with one reactor in the “Capture” mode and the second reactor in the “Regeneration” mode. In the capture mode reactor, the solid reactant in the oxide form, reacts with HBr converting the oxide to bromide. Simultaneously, air is delivered to the regeneration mode reactor, which contains the solid reactant in the bromide form, releasing bromine and converting the solid reactant bromide to the oxide. As the capture and regeneration reactions proceed, the composition of both of the reactors switches; that is, the solid reactant oxide in the capture reactor depletes as the oxide is converted to the bromide form. Concurrently, the solid reactant bromide in the regeneration reactor depletes as more of the reactant is converted to the oxide form. When depletion in both of the reactors is substantially complete, the feed to each reactor is switched, thereby switching the operation of the reactors from capture to regeneration mode and vice versa. The result of the capture and regeneration reactions occurring in cyclic fashion is the continuous capture of HBr and regeneration of bromine.