JPH11116508A - Treatment for transforming carbon dioxide into organic material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a treating method for transforming carbon dioxide into an organic material, by which the carbon dioxide (CO2 ) is transformed into a reusable organic material by an industrially feasible method by reducing the carbon dioxide with hydrogen by a hydrothermal reaction by using an iron component as a catalyst, etc., and water as a hydrogen source under saturated steam pressure. SOLUTION: CO2 is supplied to a hopper 1 from a supplying line 2, and water of >=2 molar times as much as the number of moles of the CO2 is supplied from a water-supplying line 3. The supplied CO2 and water are formed into a aqueous solution state in a mixing line 4, and a pulverized slag consisting essentially of FeO, etc., is fed to the mixture in the aqueous solution state. The obtained mixture is kneaded by an agitator 9 to provide a slurry. The obtained slurry coming through a valve 10 is pressurized by a slurry pump 5 to 100-400 atm, and introduced into a reaction tube 7 at a temperature kept by a heater 6. A hydrothermal reaction of the slurry is carried out in the reaction tube 7 at about 300-400 deg.C under a saturated steam pressure to reduce the CO2 with hydrogen to provide an organic material such as methanol and propane.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to carbon dioxide (C) generated by burning fossil fuels for thermal power generation and the like.
O ₂ ) to organic matter, especially CO 2
₂ as a fuel.

[0002]

2. Description of the Related Art Conventionally, as a method of preventing global warming, C
The O ₂ was recovered, fixed or reused studies have been made to this. As a typical example, a method has been proposed in which the recovered CO ₂ is clathrated and fixed in the sea, or the CO ₂ is fixed by biomass utilizing algae or microorganisms to achieve recycling. CO ₂
There has been proposed a method of producing methane and hydrogen from a raw material using a catalyst and a catalyst.

[0003] However, these are just the beginning of research, and with regard to fixation by clathrating, the problem of the marine environment has been newly highlighted, and problems with economic efficiency such as energy consumption for clathrating. Has been pointed out. It has also been pointed out that there is a problem in mass production (processing) with respect to processing using biomass. Furthermore, the method of producing methane and hydrogen from CO ₂ by catalytic hydrogenation is currently the most promising, but the energy required for chemical conversion of CO ₂ may be high. Financially concerned,
At present, there is no specific plan for riding on an industrial basis.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method for converting CO ₂ into organic matter and reusing it as a resource by an industrially feasible method.

[0005]

SUMMARY OF THE INVENTION The present invention aims to solve the above-mentioned problems. The gist of the present invention is to use carbon dioxide as an iron component as a catalyst or a reactant, and a saturated steam pressure using water as a hydrogen source. An object of the present invention is to provide a method for organically converting carbon dioxide, which comprises performing hydrogen reduction by a hydrothermal reaction below to obtain an organic compound.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, CO ₂ is hydrogenated to be converted into an organic substance and CO ₂ is recycled. Therefore, under a saturated steam pressure using water as a hydrogen source, CO ₂ is hydrogen-reacted using an iron component as a catalyst or an adsorbent. As the iron component,
Fe ⁰ , FeO, and Fe ₃ O ₄ can be used. In this embodiment, for example, slag is used. Slag is FeO, Fe ₃
Although O ₄ is a main component, it is converted into hematite (Fe ₂ O ₃ ) by the above reaction. If hematite slag is returned to the blast furnace, it will be used as a raw material for steelmaking as it is, and will not be a resource loss. The slag is its F
The component e works as a catalyst. In performing hydrogen reduction,
Since water is used as a hydrogen source as it is, it is a much cheaper solvent than one using hydrogen or the like.

From the viewpoint of energy, it is only necessary to maintain an environment of a saturated steam pressure for hydrothermal reaction, and the reaction between CO ₂ and FeO / Fe ₃ O ₄ is an exothermic reaction. It is also advantageous in point. According to the present invention, energy loss and resource loss are reduced and CO ₂
Can be easily reused as an energy source.
It is possible to provide a more economical method than the conventional CO ₂ treatment method.

[0008] With reference to FIG. 1, when describing the present invention in detail, CO ₂ from the CO ₂ supply line 2 into the hopper 1
Is supplied from a water supply line 3, and C is supplied through a mixing line 4.
O ₂ is converted into an aqueous solution and sent to the hopper 1. Next, the pulverized slag mainly containing FeO and Fe ₂ O ₃ is fed into the hopper 1 and kneaded by a stirrer 9 to form a slurry. A slurry made of CO ₂ , water, and slag is pressurized by a slurry pump 5 through a valve 10 and enters a reaction tube 7 maintained at a temperature by a heater 6, where it is saturated with steam of about 300 ° C. to 400 ° C. Under pressure, a hydrothermal reaction takes place.

[0009] for that again, the number of moles of CO _2, water is 2
It is preferable that the pressure is increased to 100 to 400 atm in addition to the molar number twice or more. Thus, from 300 ° C. to 4
FeO, Fe ₃ O in water under saturated steam pressure of about 00 ° C
_When slag containing ₄ as a main component is mixed and CO ₂ is fed into the slag, CO ₂ is reduced by hydrogen by the catalytic action of Fe and the action of promoting the compounding reaction to hematite formation, and methanol (CH ₃ OH) And propane (CH ₃ CH ₂ CH ₃ )
And so on.

The above-mentioned hydrogen reduction is carried out, for example, by the following formula. CO ₂ + H ₂ O + Fex () y → CH ₃ OH,
CH ₃ OCH _3, etc. In the parentheses, Fe ⁰ , FeO, Fe ₃ O ₂ , Fe
It is a mixture of ₂ O ₃ . Fe ⁰ becomes Fe ³⁺ , three hydrogen atoms, Fe ²⁺ O two hydrogen atoms, and Fe ₃ O ₄ one hydrogen atom so as to reduce CO ₂ .

As described above, the slag has a function as a catalyst, and at the same time, has a function of promoting hematite to promote a compounding reaction, thereby reducing CO ₂ with hydrogen in water. FIG. 2 shows the result of the GC / MS analysis (mass analysis) at this time. The peak a is methanol, b is acetaldehyde, and c is propanol, indicating that an organic compound is produced. In addition, when the saturated steam pressure is changed within the range of 300 ° C. to 400 ° C., methane and the like can be generated. In the case of producing organic substances, particularly when it is desired to synthesize methanol, the vicinity of 350 ° C. is an effective reaction region.

The aqueous solution containing the organic matter reacted in this way is separated from the slag by the filter 8 and led to the next reaction line to a distillation tower or the like, where it is separated into predetermined organic matter and water. Since most tailings separated has been hematite reduction, or used as a mineral material in a blast furnace, or, H ₂ or C
It can be magnetized and reused by a hydrothermal reaction at about 200 ° C. with a water gas such as O. In this case, the reaction tube 7 can be replaced by a cartridge, and can be replaced.

[0013]

EXAMPLE Water, which is twice or more the number of moles of CO ₂ , was converted into an aqueous solution through a mixing line and supplied to a water hopper 1, and slag pulverized to a mesh of 200 mesh or less was added thereto. When the reaction was carried out at 100 to 400 atm at 400 ° C., CO ₂ was able to be made organic.

[0014]

According to the present invention, CO ₂ can be easily reused as an energy source while reducing energy loss and resource loss.

[Brief description of the drawings]

FIG. 1 is a flowchart of a processing method according to the present invention.

FIG. 2 is a diagram showing the results of GC / MC analysis based on the present invention.

[Explanation of symbols]

1 hopper 2 CO ₂ supply line 3 water supply line 4 mixing line 5 slurry pump 6 heater 7 reaction tube 8 filter 9 agitator 10 valve

Claims (1)

[Claims] 1. An organic substance of carbon dioxide, wherein hydrogen reduction is carried out by a hydrothermal reaction under a saturated steam pressure using water as a hydrogen source and carbon dioxide as an iron component as a catalyst or a reactant to obtain an organic compound. Treatment method.