Hydrocarbon production method
The hydrocarbon production method includes a first production step of producing carbon monoxide using carbon dioxide contained in source gas, and a second production step of producing hydrocarbon using hydrogen contained in source gas and carbon monoxide. The source gas contains at least one of carbon dioxide, carbon monoxide, and hydrogen not derived from fossil fuel.
1 . A hydrocarbon production method comprising:
a first production step of producing carbon monoxide using carbon dioxide contained in a source gas;
a second production step of producing hydrocarbon using hydrogen contained in the source gas and the carbon monoxide, wherein the source gas comprises at least one of carbon dioxide, carbon monoxide, and hydrogen that are not derived from fossil fuel;
a hydrocarbon gas separation step of separating a hydrocarbon gas having 4 or less carbon atoms from the hydrocarbon produced in the second production step;
a combustion step of combusting the hydrocarbon gas; and
a temperature raising step of sending to a preheater the combustion exhaust gas produced in the combustion step and raising the temperature of the source gas of the first production step and the second production step by the preheater with the combustion exhaust gas produced in the combustion step,
wherein the source gas used in the first production step and the second production step comprises carbon dioxide recovered from the combustion exhaust gas.
2 . The hydrocarbon production method according to claim 1 , wherein the source gas used in the first production step and the second production step comprises an unreacted gas generated in the first production step or the second production step.
3 . The hydrocarbon production method according to claim 1 , wherein the source gas used in the first production step and the second production step comprises hydrogen produced by electrolysis of water using renewable energy.
4 . The hydrocarbon production method according to claim 1 , wherein the source gas used in the first production step comprises carbon dioxide recovered from the atmosphere.
5 . The hydrocarbon production method according to claim 1 , wherein the source gas used in the first production step comprises carbon dioxide recovered from combustion exhaust gas.
6 . The hydrocarbon production method according to claim 1 , wherein the first production step produces carbon monoxide by reverse water gas shift reaction.
7 . The hydrocarbon production method according to claim 1 , wherein the first production step produces carbon monoxide by electrolytic reduction.
8 . The hydrocarbon production method according to claim 1 , wherein the second production step produces hydrocarbon by a reaction by FT process (Fischer-Tropsch process).
9 . The hydrocarbon production method according to claim 1 , further comprising:
a recycled gas separation step of separating at least one of carbon dioxide, carbon monoxide, and hydrogen contained in the gas discharged in the second production step as a recycled gas; and
a mixing step of mixing the separated recycled gas with the source gas used in the first production step.
10 . The hydrocarbon production method according to claim 9 , comprising a hydrocarbon gas separation step of separating a hydrocarbon gas having 4 or less carbon atoms from the hydrocarbon produced in the second production step,
wherein the hydrocarbon gas separation step separates the hydrocarbon gas by at least one method of membrane separation, pressure swing adsorption, and thermal swing adsorption, or
wherein the recycled gas separation step separates the recycled gas by at least one method of membrane separation, pressure swing adsorption, and thermal swing adsorption, or
wherein the hydrocarbon gas separation step and the recycled gas separation step each separate the hydrocarbon gas and the recycled gas, respectively, by at least one method of membrane separation, pressure swing adsorption, and thermal swing adsorption.
11 . The hydrocarbon production method according to claim 3 ,
wherein the first production step or the second production step includes a reaction that generates water, and
water generated by the reaction is used as a raw material for the electrolysis.
12 . The hydrocarbon production method according to claim 1 , comprising a recycled gas separation step of separating at least one of carbon dioxide, carbon monoxide, and hydrogen contained in the gas discharged in the second production step as a recycled gas,
wherein the hydrocarbon gas separation step and the recycle gas separation step are performed as one step.
13 . The hydrocarbon production method according to claim 6 , wherein the reverse shift reaction is carried out using a reverse shift catalyst containing a copper-based catalyst and zinc oxide.
14 . The hydrocarbon production method according to claim 13 , wherein when the entire amount of the copper element contained in the copper-based catalyst is converted into the amount of copper oxide, the ratio of the amount of zinc oxide is 10 to 70% by mass based on the total amount of copper oxide and zinc oxide.
15 . The hydrocarbon production method according to claim 13 , wherein the reverse shift catalyst further contains at least one metal selected from the group consisting of rhodium, platinum, or iron-chromium.
16 . The hydrocarbon production method according to claim 8 , wherein the reaction by FT process is carried out using an FT catalyst comprising an iron-based catalyst containing an iron component and at least one added metal selected from the group consisting of sodium, potassium, and cesium.
17 . The hydrocarbon production method according to claim 16 , wherein the content of the added metal in the iron-based catalyst is 0.2 to 40% by mass based on the amount of a portion other than the added metal in the iron-based catalyst.