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This invention describes a system of two or more deep underground reactors that use the natural pressure from the earth's depth to treat materials. These reactors are designed to share heat, allowing the waste heat from one process to fuel another. The claims specifically focus on using this system to dewater coal and then liquefy it, with the dewatering process providing heat for liquefaction.
Why it matters: Since 2009, global energy strategies have significantly shifted away from coal, which was the primary material for this invention. This change makes the economic viability of such a specialized coal processing system less certain.
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