The invention relates to processes for production of dimethyl ether from methane or natural gas comprising: a dry-reforming step, wherein methane and carbon dioxide are converted into carbon monoxide and hydrogen, and a DME synthesis step, wherein the carbon monoxide and hydrogen formed in the dry-r
The invention relates to processes for production of dimethyl ether from methane or natural gas comprising: a dry-reforming step, wherein methane and carbon dioxide are converted into carbon monoxide and hydrogen, and a DME synthesis step, wherein the carbon monoxide and hydrogen formed in the dry-reforming step are converted into dimethyl ether, wherein the dry-reforming step and the synthesis step are carried out at identical pressures or at pressures, which do not differ more than 3 bar, preferably not more than 1 bar.
대표청구항▼
1. A process for production of dimethyl ether from methane (11) comprising: a dry-reforming step (21), wherein methane (11) and carbon dioxide (12) are converted into carbon monoxide and hydrogen, anda synthesis step (22), wherein the carbon monoxide and hydrogen formed in the dry-reforming step (21
1. A process for production of dimethyl ether from methane (11) comprising: a dry-reforming step (21), wherein methane (11) and carbon dioxide (12) are converted into carbon monoxide and hydrogen, anda synthesis step (22), wherein the carbon monoxide and hydrogen formed in the dry-reforming step (21) are converted into a dimethyl ether (13) and carbon dioxide,wherein the dry-reforming step (21) and the synthesis step (22) are carried out at pressures which do not differ by more than 3 bar. 2. A process according to claim 1, wherein the process is carried out at a pressure of 20 bar to 50 bar. 3. A process according to claim 1, wherein a product gas generated by the dry-reforming step (21) and containing said carbon monoxide and said hydrogen is fed directly to the synthesis step (22). 4. A process according to claim 1, wherein the carbon monoxide and hydrogen formed in the dry-reforming step (21) are converted in the synthesis step (22) into dimethyl ether (13) and carbon dioxide until the dimethyl ether is present in a concentration amounting to not less than 60% of the equilibrium concentration of dimethyl ether. 5. A process according to claim 1, wherein the product of synthesis step (22) is separated into a predominantly dimethyl ether-, methanol- and water-containing product phase (13) and a predominantly hydrogen-, carbon monoxide-, carbon dioxide- and methane-containing residual gas (14). 6. A process according to claim 5, wherein the predominantly hydrogen-, carbon monoxide-, carbon dioxide- and methane-containing residual gas (14) is fed to the dry-reforming step (21). 7. A process according to claim 5, wherein the predominantly hydrogen-, carbon monoxide-, carbon dioxide- and methane-containing residual gas (14) is used for providing thermal energy for the dry-reforming step (21). 8. A process according to claim 1, wherein dimethyl ether is converted into a product containing olefins, wherein dimethyl ether is fed to a synthesis of olefins directly or only carbon dioxide is separated from the dimethyl ether before the dimethyl ether is fed to the synthesis of olefins. 9. A process according to claim 1, wherein the dry-reforming step (21) and the synthesis step (22) are carried out at pressures which do not differ by more than 1 bar. 10. A process according to claim 1, wherein the carbon monoxide and hydrogen formed in the dry-reforming step (21) are converted in the synthesis step (22) into dimethyl ether (13) and carbon dioxide until the dimethyl ether is present in a concentration amounting to not less than 70% of the equilibrium concentration of dimethyl ether. 11. A process according to claim 1, wherein the carbon monoxide and hydrogen formed in the dry-reforming step (21) are converted in the synthesis step (22) into dimethyl ether (13) and carbon dioxide until the dimethyl ether is present in a concentration amounting to not less than 80% of the equilibrium concentration of dimethyl ether. 12. A process according to claim 1, wherein the carbon monoxide and hydrogen formed in the dry-reforming step (21) are converted in the synthesis step (22) into dimethyl ether (13) and carbon dioxide until the dimethyl ether is present in a concentration amounting to not less than 90% of the equilibrium concentration of dimethyl ether. 13. A process according to claim 1, wherein dimethyl ether is converted into a product containing ethylene and/or propylene, wherein dimethyl ether is fed to a synthesis of ethylene and/or propylene directly or only carbon dioxide is separated from the dimethyl ether before the dimethyl ether is fed to the synthesis of ethylene and/or propylene. 14. A process according to claim 1, wherein the dry-reforming step (21) is carried out at a temperature of between 750° C. and 950° C. 15. A process according to claim 1, wherein the molar ratio of water to carbon in the feed to the dry-reforming step (21) is less than 2:1. 16. A process according to claim 1, wherein the dry-reforming step (21) and the synthesis step (22) are carried out at pressures which do not differ by more than 0.5 bar. 17. A process according to claim 1, wherein the dry-reforming step (21) and the synthesis step (22) are carried out at pressures which do not differ by more 0.3 bar. 18. A process according to claim 1, wherein the dry-reforming step (21) and the synthesis step (22) are carried out at pressures which do not differ by more than 0.2 bar. 19. A process according to claim 1, wherein the dry-reforming step (21) and the synthesis step (22) are carried out at pressures which do not differ by more than 0.1 bar. 20. A process for production of dimethyl ether from methane (11) comprising: a dry-reforming step (21), wherein methane (11) and carbon dioxide (12) are converted into carbon monoxide and hydrogen, anda synthesis step (22), wherein the carbon monoxide and hydrogen formed in the dry-reforming step (21) are converted into a dimethyl ether (13) and carbon dioxide,wherein no compression or expansion is performed between the dry-reforming step (21) and the synthesis step (22).
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이 특허에 인용된 특허 (3)
Olah, George A.; Prakash, G. K. Surya, Conversion of carbon dioxide to methanol and/or dimethyl ether using bi-reforming of methane or natural gas.
Baek,Young Soon; Cho,Won Ihl; Cho,Byoung Hak; Suh,Jung Chul; Kim,Dong Hyuk; Kim,Hyung Gyu; Lee,Seung Ho; Ju,Woo Sung, Process for the preparation of dimethylether from hydrocarbons.
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