Processes for producing propylene from paraffins

摘要

Embodiments of processes for producing propylene from paraffins are provided. The process comprises the steps of combining an effluent that comprises propylene and propane from a paraffin dehydrogenation reactor with an offgas stream that comprises propane to form a combined effluent stream. The combined effluent stream is separated into a propylene product stream and a propane-rich recycle stream. The propane-rich recycle stream is introduced to the paraffin dehydrogenation reactor operating at dehydrogenation conditions to convert propane in the propane-rich recycle stream to propylene.

主权项

1. A process for producing propylene from paraffins, the process comprising the steps of:
combining an effluent comprising propylene and propane from a paraffin dehydrogenation reactor with an offgas stream from a butane isomerization process comprising propane and hydrogen to form a combined effluent stream; passing the combined effluent stream through a chloride treater and dryer unit to generate a treated combined effluent stream; separating the hydrogen from the treated combined effluent stream to form a hydrogen stream and passing the hydrogen stream to the paraffin dehydrogenation reactor; separating a remainder of the treated combined effluent stream into a propylene product stream and a propane-rich recycle stream; passing the propane-rich recycle stream to a separation unit to generate a propane rich-overhead stream, and a C4+ bottoms stream; passing the C4+ bottoms stream to a second separation unit to generate a C4 stream and a C5+ stream; passing the C4 stream to the butane isomerization process to generate the offgas stream from the butane isomerization process comprising hydrogen; and introducing the propane-rich overhead stream to the paraffin dehydrogenation reactor operating at effective dehydrogenation conditions to produce the effluent comprising propylene and propane.