The Cynar Technology converts mixed Waste Plastics into synthetic fuels that are cleaner, low in sulphur and in the case of the diesel, a higher cetane than generic diesel fuel. The key elements of the Technology involve pyrolysis and distillation.
A full scale plant is already in operation in Ireland, and a second one has been awarded planning permission.
In a promotion of the plastic to diesel process, a light aircraft will fly from Sydney to London on diesel produced by Cynar. For more, see http://www.nytimes.com/2012/10/16/business/energy-environment/halfway-around-the-world-fueled-by-plastic-trash.html