to the outside of the heat insulating package 20 is suppressed a little gas exists in the inner space of the heat insulating package 20 as the gas rare gases such as argon gas and helium gas which are inert in a temperature range of the high temperature reaction unit 11 and the low temperature reaction unit 12 are preferable but the gas is not to the rare gases as the material of the heat insulating package 20 for example metal plates such as stainless sus 304 can be used moreover in order to suppress the heat loss by the radiation from the reactor 10 a radiation prevention film is formed on the inner surface of the heat insulating package 20 for example gold au and the like can be used as the radiation prevention film as shown in fig2 in the reactor 10 the high temperature reaction unit 11 and the low temperature reaction unit 12 are provided in the state of being separated from each other in addition it is preferable that radiation prevention films similar to the one provided on the inner surface of the heat insulating package 20 are formed on the outer peripheral surfaces of the high temperature reaction unit 11 and the low temperature reaction unit 12 as shown in fig4 6 the low temperature reaction unit 12 includes three layers which are an upper layer metal substrate 52 provided with a vaporizing flow path 41 which is the vaporizer 13 an intermediate layer metal substrate 54 provided with a co removal flow path 43 which is the co remover 15.