Scientists have submitted polypropylene transformation technology to sufficiently pure gasoline and diesel fuel using supercritical water.
From polypropylene make about a quarter of all plastic products, ranging from toys and medical devices, ending with packages for chips. Every year, 75 million tons of such waste falls on landfills. However, chemists from the university Perdy found a way to turn these garbage mountains into fuel, which can be used to refuel cars.
Researchers used supercritical water, a special state of the substance at which the difference disappears between the liquid and gas phase. To do this, they heated H2O to a temperature of 380-500 ° C at a pressure of 23 MPa, which is approximately 230 times the normal atmospheric.
91% of purified polypropylene waste were placed in such conditions for 0.5-6 hours turn into oil. The duration of the transformation depends on temperature. For example, at 450 ° C required less than 60 minutes. In this case, 80-90% of the components of the resulting mass had the same range of boiling temperatures as naphtha, and their specific combustion heat was 48-49 MJ / kg. By-products of this process include gasoline, diesel oils and raw materials for other chemicals.
This method of transformation is suitable for utilization of 90% of the global waste of polypropylene into fuel, and compared with the combustion and mechanical processing, it is potentially more energy efficient and reduces greenhouse gas emissions. In addition to environmental benefits from reducing environmental pollution with plastic, you can earn money on sale. Therefore, chemists hope that the technology developed by them will soon be implemented on an industrial scale.
Previously, we also reported that researchers from the University of Pittsburgh