Patent ID: 8563793

Claim:
An integrated method for propylene production and recovery, comprising: (a) processing, in a propylene recovery unit (PRU), a hydrocarbon feed comprising propylene-containing products of both a catalytic cracking process and a catalytic dehydrogenation process, to provide PRU products comprising a purified propylene fraction and a purified propane fraction wherein the PRU comprises multiple fractionation units, and includes a dewatering unit after a deethanizer and a dewatering unit after a propane/propylene splitter; (b) selectively hydrogenating diolefins and acetylenes in the purified propane fraction, thereby generating a purified propane fraction with reduced diolefins and acetylenes; (c) passing the purified propane fraction with reduced diolefins and acetylenes to the catalytic dehydrogenation process, thereby generating a liquid product stream comprised substantially of propylene and propane; and (d) passing the liquid product stream back to the PRU; wherein the overall conversion of propane in the product from the catalytic cracking process is at least about 90%.