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Research and process development to produce the ash-free coal (Hyper-coal, HPC) has been carrying out since 1999. A new cost-effective process (Hyper-coal process) by the application of the solvent de-ashing technology can be adopted for the Hyper-coal process. Coal extraction rate achieved almost 70 wt.%daf (based on dry and ash-free coal) from some kinds of coals using two-ring aromatics as the...
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