A process for purifying and converting carbon dioxide using renewable energy.

Abstract

The present invention generally relates to processes and systems for purifying and converting CO2 into high-quality fuels and chemicals that are low or zero carbon using renewable energy. In one aspect, the present invention provides a method for producing a stream comprising at least 90 mol% CO2. In some cases, the CO2 stream is processed to produce low carbon fuels and chemicals. In this process, at least a portion of the CO2 is reacted with a stream comprising H2 in a reverse water gas shift (RWGS) reactor, thereby producing a product stream comprising CO.

Claims

1. A method for preparing a carbon dioxide stream for use in the production of renewable fuels and chemicals, a. CO ２ Contaminated CO2 containing pollutants ２ A step of providing a flow, wherein the contaminants are hydrocarbons, oxygenated hydrocarbons, SO2 ２ H ２ S, COS, N ２ A step comprising ammonia, an amine, or a combination thereof, b. The contaminated CO ２ A step of supplying a flow to an adsorbent bed, thereby generating an outlet flow, where the outlet flow of the adsorbent bed is SO ２ H ２ Step 1: The concentrations of S and COS are less than 20 ppb, and the concentrations of amine and ammonia are less than 100 ppb. c. A step of mixing the outlet stream of the adsorbent bed with a stream containing O ２ to thereby generate a combustor feed stream d. A step of supplying the combustor feed stream to a combustion reactor, wherein the contaminants are oxidized in the combustion reactor, thereby generating a combustor product stream. Methods that include...

2. The aforementioned O ２ However, H using renewable energy ２ The method according to claim 1, which is produced by the electrolysis of oxygen.

3. H using renewable energy ２ H produced from the electrolysis of O ２ However, the contaminated CO2 is added to the aforementioned contaminated CO2 stream and the contaminated CO2 is removed by hydrodesulfurization (HDS). ２ The method according to claim 1, used for purifying a flow.

4. O in the combustor supply stream ２ The molar flow rate is O ２ Using a fuel-to-combustible ratio sensor, the equivalent ratio of the combustor feedstream fuel to O2 is controlled to be less than 1.00, thereby providing a combustor product stream, where the molar amount of hydrocarbons in the combustor product stream is the amount of the contaminated CO2. ２ The method according to claim 1, wherein the amount of hydrocarbons in the flow is less than 5%.

5. The combustor product flow is heated CO ２ Flow and H ２ The heated CO2 is mixed with the flow. ２ Flow and H ２ H in exile ２ and CO ２ The method according to claim 1, wherein the molar ratio of is between 1.5 and 4.

0.

6. The aforementioned H ２ Flow and the CO ２ The method according to claim 5, wherein the flow is heated separately to between 900°F (482°C) and 1,250°F (677°C) before being mixed with the combustor product flow.

7. Each of the heated streams is further heated to 1750°F (954°C) before being introduced into the catalytic reverse water-gas shift (RWGS) reactor along with the combustor product stream, and the catalytic reverse water-gas shift (RWGS) reactor is H ２ H with a volume ratio (v / v) of CO between 1.0 and 4.0 ２ The method according to claim 6, which produces a synthesis gas stream containing a mixture of CO.

8. The method according to claim 7, wherein the synthesis gas is introduced into a liquid fuel production (LFP) reactor, the LFP reactor is heated using renewable energy, and a low-carbon fuel and chemicals are produced therefrom.

9. CO2 for use in the production of renewable fuels and chemicals ２ A system for adjusting flow, a. An adsorbent bed configured to convert a contaminated carbon dioxide flow into an outlet flow, wherein (i) the contaminated CO ２ Flow is CO ２ It contains and contaminants, the contaminants being hydrocarbons, oxygenated hydrocarbons, SO2 ２ H ２ S, COS, N ２ (ii) the outlet flow of the adsorbent bed is SO ２ H ２ An adsorbent bed in which the concentrations of S and COS are less than 20 ppb, and the concentrations of amine and ammonia are less than 100 ppb, b. H ２ O is electrolyzed, and as a result H ２ and O ２ An electrolytic device configured to generate, c. The outlet flow of the adsorbent bed and the O from the electrolytic device ２ A combustion reactor configured to convert a mixture of the following into a combustor product stream, wherein the contaminants are oxidized in the combustor product stream, and A system that includes this.

10. The outlet flow of the adsorbent bed and the O from the electrolytic device ２ O in a mixture of ２ The molar flow rate is O ２ Using a fuel-to-adsorbent ratio sensor, the equivalent ratio of the mixture of the adsorbent bed outlet flow and the oxygen-containing flow is controlled to be less than 1.00, thereby providing a combustor product flow, where the molar amount of hydrocarbons in the combustor product flow is the contaminated CO ２ The system according to claim 9, wherein the amount of hydrocarbons in the flow is less than 5% of the total moles.

11. The combustor product flow is heated CO ２ Flow and H ２ The heated CO2 is mixed with the flow. ２ Flow and H ２ H in exile ２ and CO ２ The system according to claim 9, wherein the molar ratio of is between 1.5 and 4.

0.

12. The aforementioned H ２ Flow and the CO ２ The system according to claim 11, wherein the flow is heated separately to between 900°F (482°C) and 1,250°F (677°C) before being mixed with the combustor product flow.

13. Each of the heated streams is further heated to 1750°F (954°C) before being introduced into the catalytic reverse water-gas shift (RWGS) reactor along with the combustor product stream, and the catalytic reverse water-gas shift (RWGS) reactor is H ２ H with a volume ratio (v / v) of CO between 1.0 and 4.0 ２ The system according to claim 12, which generates a synthesis gas flow containing a mixture of CO.

14. The system according to claim 13, wherein the synthesis gas is fed into a liquid fuel production (LFP) reactor, the LFP reactor is heated using renewable energy, and thereby low-carbon fuels and chemicals are produced.

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