Inhibiting polymer formation in the separation of butene-1 and butene-2 produced in the catalytic dehydrogenation of nu-butane

Claim 1

IN A PROCESS FOR PRODUCING BUTADIENE FROM N-BUTANE BY CATALYTIC DEHYDROGENATION OF N-BUTANE, THE IMPROVEMENT COMPRISING INTRODUCING THE EFFLUENT OF SAID CATALYTIC DEHYDROGENATION INTO A SEPARATION VESSEL UNDR A SUPERATMOSPHERIC PRESURE AND THERIN SEPARATING A LIQUID PHASE FROM A VAPOR PHASE, WITHEDRAWING SAID VAPOR PHASE AND IN AN ABSORPTION-STRIPPING OPERATION SEPARATING FROM SAID VAPOR PHASE A FUEL GAS COMPRISING C1 AND C2 HYDROCARBONS ARE ONE PRODUCT OF THE PROCESS AND A FLUID COMPRISING LPG, C3 AND C4 HYDROCARBONS, DEPROPANIZING SAID FLUID THEREBY PRODUCING AN LPG PRODUCT AS ANOTHER PRODUCT OF THE PROCESS AND A C4 HYDROCARBON STREAM, PRODUCING THE PRESSURE ON THE LIQUID PHASE FROM SAID SEPARATION VESSEL IN A FLASHING OPRATION THEREBY PRODUCING FLASH VAPOR AND RESIDUAL LQUID, INTRODUCING THE FLASH VAPOR INTO SAID SEPARATION VESSEL, COMBINING SAID C4 HYDROCARBON STEAM WITH THE RESIDUAL LIQUID OF SAID FLASHING OPERATION, AND SEPARATING THIS COMBINED STREAM BY DISTILLATION INTO AN OVEREAD PRODUCT COMPRISING BUTENE-1 AND A BOTTOMS PRODUCT COMPRISING BUTENE-2.