Apparatus for contacting fluidized solid particles with gas

Claim 1

A PLANT FOR USE IN A FLUIDISED SOLIDS PROCESS COMPRISING FIRST AND SECOND REACTION VESSELS EACH ADAPTED TO CONTAIN FLUIDISED SOLIDS, MEANS TO PASS ONE GAS THROUGH THE FIRST REACTION VESSEL AND ANOTHER GAS THROUGH THE SECOND REACTION VESSEL, MEANS FORMING A CLOSED CIRCUIT HAVING TWO PARALLEL BRANCHES FOR INERT GAS, SAID CLOSED CIRCUIT BEING INDEPENDENT OF SAID MEANS FOR PASSING GASES THROUGH THE REACTION VESSELS, FIRST AND SECOND TUBULAR VESSEL ONE IN EACH OF THE BRANCHES OF SAID CLOSED CIRCUIT FOR CONTAINING SOLID PARTICLES, MEANS TO CIRCULATE AN INERT GAS THROUGH SAID CLOSED CIRCUIT AND UPWARDLY THROUGH EACH OF SAID TUBULAR VESSELS TO FLUIDISE SOLID PARTICLES THEREIN, A FIRST CONNECTION FOR TRANSFERRING PARTICLES FROM THE FIRST REACTION VESSEL TO THE SECOND ONE, A SECOND CONNECTION FOR TRANSFERRING PARTICLES FROM THE SECOND REACTION VESSEL TO THE FIRST REACTION VESSEL, EACH SAID CONNECTION PASSING THROUGH A DIFFERENT ONE ONLY OF SAID TUBULAR VESSELS SO THAT THE FLUIDISED PARTICLES IN THE TUBULAR VESSELS FORM GAS SEALS TO PREVENT GAS FROM PASSING FROM ONE REACTION VESSEL TO THE OTHER.