To carry out efficient cracking of a hydrocarbon resource, etc., by synthesizing formic acid from produced hydrogen and carbon dioxide and recycling the synthesized formic acid to a conversion process to perform the cracking.
The objective conversion method comprises a pretreating step 11 to preheat a mixture of a hydrocarbon resource, etc., with water and formic acid at 200-360°C under 7-35 MPa pressure, a cracking step 12 to crack the hydrocarbon resource, etc., by heating the mixture at 360-600°C under 7-35 MPa pressure and a separation step 13 to separate the product of the cracking step into an oil and water and further contains a gasification step 14 to gasify the oil separated by the separation step and a formic acid synthesizing step 16 to synthesize formic acid by heating a part of hydrogen and carbon dioxide generated by the gasification step at 20-250°C under 2-35 MPa pressure.
DEN TAKEYOSHI
NISHIMURA KENJI
TANAKA AKIRA
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