Cyclic process for the removal of hydrogen sulfide from high temperature gaseous streams without reduction in temperature

Claim 1

A CYCLIC PROCESS FOR THE REMOVAL OF HYDROGEN SULFIDE FROM THE HIGH TEMPERATURE GASEOUS PRODUCT STREAM OF A HYDRODESULFURIZATION PROCESS PRIOR TO THE INTRODUCTION OF SUCH HIGH TEMPERATURE PRODUCT STREAM INTO A CATALYTIC REFORMING PROCESS IN WHICH PRODUCT STREAM THE HYDROGEN SULFIDE IS ESSENTIALLY THE ONLY ACIDIC COMPONENT FOLLOWED BY REGENERATION OF THE REAGENT USED FOR SUCH REMOVAL, WHICH COMPRISES CONTACTING THE GASEOUS STREAM AT A TEMPERATURE BETWEEN 600*F. AND 1000*F. WITH A SOLID REAGENT CONSISTING ESSENTIALLY OF PELLETS OF AN ALKALINE EARTH METAL HYDROXIDE TO PRODUCE PELLETS OF THE CORRESPONDING ALKALINE EARTH METAL SULFIDE AND A HYDROGEN SULFIDE-FREE GASEOUS STREAM, DISCONTINUING CONTACTING THE GASEOUS STREAM WITH THE SOLID REAGENT, CONVERTING THE PELLETS OF ALKALINE EARTH METAL SULFIDE BACK TO THE HYDROXIDE BY TREATING THE SULFIDE FORMED WITH AN OXYGEN-CONTAINING GAS AND AN AQUEOUS SOLUTION OF AN ALKALI METAL COMPOUND FROM THE GROUP CONSISTING OF ALKALI METAL HYDROXIDES AND ALKALI METAL SULFIDES, REMOVING THE AQUEOUS ALKALI METAL POLYSULFIDE THUS PRODUCED FROM THE PELLETS OF ALKALINE EARTH METAL HYDROXIDE AND REINTRODUCING THE GASEOUS STREAM TO THE BED OF SOLID REAGENT PELLETS.