Heavy olefin production process

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.