(450b) Molten Salt Chemical Looping Catalysis for Reactive Separation of HBr in a Halogen Based Natural Gas to Liquids Process
In contrast to solid-based chemical looping systems, the liquid bromide salt was found to be cycleable without attrition or deactivation. Further, selectivity to hydrogen bromide oxidation over hydrocarbon oxidation was very high when mixtures of olefins and hydrogen bromide were bubbled through the oxide-salt slurry. This was justified by the fact that hydrogen bromide is soluble in the melt whereas hydrocarbons did not dissolve.
In addition, a process model that makes use of reactive separation of hydrogen bromide from hydrocarbons using molten salt-based chemical looping is presented as a potentially lower cost alternative to a process model using conventional separations in bromine-base methane conversion. The heat exchange duties and separations in corrosive and non-corrosive environments were compared using the two models.