METHOD FOR THE PRODUCTION OF PROPENE FROM PROPANE

THE INVENTION RELATES TO A PROCESS FOR PREPARING PROPENE FROM PROPANE, COMPRISING THE STEPS: A) A FEED GAS STREAM A COMPRISING PROPANE IS PROVIDED; B) THE FEED GAS STREAM A COMPRISING PROPANE AND AN OXYGENOUS GAS STREAM ARE FED INTO A DEHYDROGENATION ZONE AND PROPANE IS SUBJECTED TO A NONOXIDATIVE CATALYTIC, AUTOTHERMAL DEHYDROGENATION TO PROPENE TO OBTAIN A PRODUCT GAS STREAM B COMPRISING PROPANE, PROPENE, METHANE, ETHANE, ETHENE, NITROGEN, CARBON MONOXIDE, CARBON DIOXIDE, STEAM AND HYDROGEN; C) PRODUCT GAS STREAM B IS COOLED AND STEAM IS REMOVED BY CONDENSATION TO OBTAIN A STEAM-DEPLETED PRODUCT GAS STREAM C; D) UNCONDENSABLE OR LOW-BOILING GAS CONSTITUENTS ARE REMOVED BY CONTACTING PRODUCT GAS STREAM C WITH AN INERT ABSORBENT AND SUBSEQUENTLY DESORBING THE GASES DISSOLVED IN THE INERT ABSORBENT TO OBTAIN A C3 HYDROCARBON STREAM D1 AND AN OFFGAS STREAM D2 COMPRISING METHANE, ETHANE, ETHENE, NITROGEN, CARBON MONOXIDE, CARBON DIOXIDE AND HYDROGEN; E) THE C3 HYDROCARBON STREAM D1 IS COOLED AND COMPRESSED TO OBTAIN A LIQUID C3 HYDROCARBON STREAM E1; F) THE LIQUID C3- HYDROCARBON STREAM E1 IS FED INTO A FIRST DISTILLATION ZONE AND SEPARATED DISTILLATIVELY INTO A STREAM F1 COMPOSED OF PROPANE AND PROPENE AND A STREAM F2 COMPRISING ETHANE AND ETHENE; G) STREAM F1 IS FED INTO A (SECOND) DISTILLATION ZONE AND SEPARATED DISTILLATIVELY INTO A PRODUCT STREAM G1 COMPOSED OF PROPENE AND A STREAM G2 COMPOSED OF PROPANE, AND STREAM G2 IS RECYCLED AT LEAST PARTLY INTO THE DEHYDROGENATION ZONE.