Fluid coking-steam cracking combination process

Abstract

Abstract THIS INVENTION RELATES TO A FLUID COKING-STEAM CRACKING FURNACE PROCESS COMBINATION FOR PRODUCING COKE AND GASEOUS HYDROCARBONS FROM A HEAVY HYDROCARBON FEEDSTOCK WHEREIN THE HEAT REQUIREMENTS FROM THE ENDOTHERMICCRACKING REACTION IN THE FLUID COKING VESSEL ARE SUPPLIED DIRECTLY TO THE FLUIDIZED BED OF HOT CARBONACEOUS PARTICLES. IN ONE EMBODIMENT, STEAM IS HEATED IN A FURNACE, PREFERABLY A STEAM CRACKING FURNACE, AND IS THEREAFTER PASSED INTO THE FLUID BED TO SUPPLY ALL OR ESSENTIALLY ALL THE HEAT REQUIREMENTS FOR THE CRACKING, I.E. COKING REACTION IN THE FLUID BED. IN ANOTHER EMBODIMENT, STEAM IS FIRST HEATED IN A FURNACE, PREFERABLY A STEAM CRACKING FURNACE. THEREAFTER, SUITABLE OXYGEN-CONTAINING COMBUSTION GAS MIXTURES, E.G. HYDROGEN-OXYGEN ARE EMPLOYED TO SUPPLY THE REMAINING PORTION OF THE HEAT REQUIRED TO RAISE THE TEMPERATURE OF THE STEAM SUCH THAT THE STEAM, WHEN INTRODUCED DIRECTLY INTO THE BOTTOM OF THE FLUID BED, IN ADDITION TO FLUIDIZING THE BED, SUPPLIES THE HEAT REQUIREMENTS FOR THE COKING REACTION. IN STILL ANOTHER EMBODIMENT, THE COMBUSTION PRODUCTS FROM SUITABLE OXYGEN-CONTAINING COMBUSTION-GAS MIXTURE, IE.E NATURAL GAS AND OXYGEN, ARE INJECTED DIRECTLY INTO THE UPPER PORTION OF FLUID BED SUCH THAT THE INJECTION OF THE COMBUSTION PRODUCTS AND STEAM FROM A STEAM CRACKING FURNACE INTO THE FLUID BED SUPPLY THE HEAT REQUIREMENT FOR THE COKING REACTION DIRECTLY TO THE BED. ADDITIONALLY, THE INTRODUCTION OF STEAM DIRECTLY INTO THE FLUID BED PROVIDES THE CARRYING AND CRACKING MEDIUM FOR THE VAPORIZED HYDROCARBONS RECOVERED FROM THE FLUID BED COKING ZONE, WHICH VAPORIZED HYDROCARBONSTEAM MIXTURE IS THEN PASSED THROUGH A STEAM CRACKING FURNACE TO PRODUCE LOW MOLECULAR WEIGHT UNSATURATED PRODUCTS.

Inventors

• 👤 Guy B Wirth
• 👤 Charles E Jahnig

Bibliographic Details