| CPC F02M 27/02 (2013.01) | 7 Claims |

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1. A reactor, comprising:
a first flow passage through which liquid and gas that reacts with the liquid flow; and
a second flow passage provided adjacent to the first flow passage and through which a heat medium flows, wherein
each of the first flow passage and the second flow passage is formed in a belt shape so as to extend in a length direction and a width direction orthogonal to the length direction, and is formed in a helical shape or a spiral shape around a vertical axis parallel to the width direction, wherein
the liquid is supplied to the first flow passage so as to flow in the length direction, wherein
the gas is supplied to the first flow passage so as to flow in the width direction.
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