Patent ID: 8273938
Filing Date: 2012-09-25
Classification: C07C,C10G

Abstract:
1. A process for producing a heavy olefin product stream, comprising: passing a hydrocarbon feedstream comprising paraffins in the C15-C28 range to an adsorption separation unit, thereby creating an extract stream, comprising normal and lightly branched paraffins in the C15-C28 range and a first desorbent and a raffinate stream, comprising non normal paraffins in the C15-C28 range and a first desorbent; mixing the extract stream with a diluent, thereby creating an intermediate extract stream; mixing the raffinate stream with a diluent, thereby creating an intermediate raffinate stream; passing the intermediate extract stream to a first separation column operated at first desorbent separation conditions, thereby creating first column overhead stream comprising the first desorbent, and a first column bottoms stream comprising the normal and lightly branched paraffins in the C15-C28 range and the diluent; passing the intermediate raffinate stream to a second separation column operated at first desorbent separation conditions, thereby creating a second column overhead stream comprising the first desorbent, and a second column bottoms stream comprising non-normal paraffins and the diluent; passing the first column bottoms stream to a third separation column operated at diluent separation conditions, thereby creating a third column overhead stream comprising the diluent, and a third column bottoms stream comprising the normal and lightly branched paraffins in the C15-C28 range; passing the second column bottoms stream to a fourth separation column operated at diluent separation conditions, thereby creating a fourth column overhead stream comprising diluent, and a fourth column bottoms stream comprising non-normal paraffins; passing the third column bottoms stream to a paraffin stream separation unit to create a first paraffin stream comprising C15 to C19 lightly branched paraffins, a second paraffin stream comprising C20 to C23 lightly branched paraffins, and a third paraffin stream comprising C24 to C28 branched paraffins; and passing the first paraffin stream to a dehydrogenation unit to generate a first effluent stream comprising C15 to C19 lightly branched olefins and unconverted paraffins; passing the second paraffin stream to the dehydrogenation unit to generate a second effluent stream comprising C20 to C23 lightly branched olefins and unconverted paraffins; and passing the third paraffin stream to the dehydrogenation unit to generate a third effluent stream comprising C24 to C28 lightly branched olefins and unconverted paraffins.