Hydrogen halide recovery

Claim 1

IN APPARATUS FOR THE CONVERSION OF HALOGENATED ORGANIC COMPOUNDS INTO NORMALLY GASEOUS PRODUCTS COMPRISING CARBON DIOXIDE AND HYDROGEN HALIDE, SAID PRODUCTS HAVING SUBSTANTIALLY NO FREE CHLORINE, FREE CARBON AND ORGANIC COMPOUNDS, A HEAT-RECUPERATIVE FURNACE MEANS COMPRISING: AN OUTER CYCLINDRICAL FIREWALL VERTICALLY POSITIONED ON A FOUNDATION AT THE BOTTOM AND COVERED AT THE TOP AND HAVING FEED INLET MEANS IN THE SIDE THEREOF FOR INTRODUCING THE SAID COMPOUNDS, A HYDROGEN SOURCE TO SUPPLY THE HYDROGEN REQUIREMENTS AND AN OXYGEN SOURCE TO SUPPLY THE OXYGEN REQUIREMENTS; AND AN INNER CYLINDRICAL HEAT CONDUCTIVE FIREWALL CONCENTRICALLY ALIGNED WITH THE SAID OUTER FIREWALL TO FORM AN ANNULAR SPACE BETWEEN THE TWO SAID FIREWALLS, AND SAID INNER FIREWALL POSITIONED ON THE SAID FOUNDATION AND IN DIRECT COMMUNICATION WITH OUTLET MEANS AT THE BOTTOM, IN OPEN COMMUNICATION WITH THE TOP INNER SPACE OF THE SAID OUTER FIREWALL AND ADAPTED TO EXCHANGE HEAT AT THE INNER CYLINDRICAL SURFACE THROUGH ITS WALL TO THE OUTER ANNULAR SPACE; WHEREBY, WHILE THE FURNACE IS BEING MAINTAINED AT A TEMPERATURE ABOVE THAT REQUIRED TO CONVERT THE SAID MATERIALS, THE FURNACE INTERNALLY PREHEATS THE FEED MATERIALS AND COOLS DOWN THE EXITING REACTION PRODUCT GASES.