Abstract
The high temperature metathesis in combination with the well-proven alkali chloride electrolysis and the hydrogen chloride synthesis permits the production of concentrated sulfuric acid and caustic soda solution of commercial quality from sodium sulfate. The fundamental principles of the process have been elucidated and mathematically modeled to provide the basis for a process concept and for an estimation of the optimal operating conditions. The thermal energy can principally be met from the hydrogen chloride synthesis. Several questions concerning chemistry, process engineering, and material selection must still to be resolved, so that an economic evaluation of the process is not yet possible.
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