Isorecycle is one of the products of refineries that feed industrial units such as lubrication (especially engine oil), paraffin making, cable jelly and making Vaseline.
The first step in making paraffin wax is to remove the oil (de-oiling or de-waxing) from the slack wax. The oil is separated by crystallization. Most commonly, the slack wax is heated, mixed with one or more solvents such as a ketone and then cooled. As it cools, wax crystallizes out of the solution, leaving only oil.