Patent ID: 7147828

Claim:
A reactor, comprising: a reaction unit that contains a fluid including high temperature and high pressure water under target reaction temperature and reaction pressure condition, said reaction unit performing a reaction treatment to a reactant by the fluid; a first pipe portion connected to said reaction unit, through which said reactant is supplied to said reaction unit; a first partition means for partitioning between said first pipe portion and said reaction unit so as to prevent leakage of any one of said fluid, said reactant, and a reaction product from said reaction unit side to said first pipe portion side; a second pipe portion connected to the bottom part of said reaction unit, through which said fluid, said reactant, and said reaction product are discharged; a second partition means for partitioning between said second pipe portion and said reaction unit; a feed pipe through which reactant is supplied to said first pipe portion; a standby chamber between said feed pipe and said first pipe portion; a first valve between said feed pipe and said standby chamber; a second valve between said standby chamber and said first pipe portion; a discharge pipe following said second pipe portion; a pressure holding valve in-line with said discharge pipe; a pressure feedback line between said discharge pipe and said standby chamber; and a valve in said pressure feedback line, wherein, said high temperature is the same as or greater than the critical temperature for the fluid, and said high pressure is the same as or greater than the critical pressure for the fluid.