Everything that goes into Frank Pringle’s recycling machine—a piece of tire, a rock, a plastic cup—turns to oil and natural gas seconds later.
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The machine is a microwave emitter that extracts the petroleum and gas hidden inside everyday objects—or at least anything made with hydrocarbons, which, it turns out, is most of what’s around you. Every hour, the first commercial version will turn 10 tons of auto waste—tires, plastic, vinyl—into enough natural gas to produce 17 million BTUs of energy (it will use 956,000 of those BTUs to keep itself running).
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Or rather, he had extracted it. Petroleum is composed of strings of hydrocarbon molecules. When microwaves hit the tire, they crack the molecular chains and break it into its component parts: carbon black (an ash-like raw material) and hydrocarbon gases, which can be burned or condensed into liquid fuel. Pringle figured that some gases from his microwaved tire had lingered, and the cold air in the shop had condensed them into diesel. If the process worked on tires, he thought, it should work on anything with hydrocarbons. The trick was in finding the optimum microwave frequency for each material—out of 10 million possibilities.