A process and apparatus for indirectly heating an endothermic reaction by combustion of reactants or products from the endothermic reaction using a plate heat exchange arrangement in a highly efficient manner. This invention is particularly suited for processes such as the production of styrene or synthesis...http://www.google.com.au/patents/US6180846?utm_source=gb-gplus-sharePatent US6180846 - Process and apparatus using plate arrangement for combustive reactant heating