SYSTEMS, METHODS, AND COMPOSITIONS FOR PRODUCTION OF SYNTHETIC HYDROCARBON COMPOUNDS
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Abstract
A process and system for producing hydrocarbon compounds or fuels that recycle products of hydrocarbon compound combustion—carbon dioxide or carbon monoxide, or both, and water. The energy for recycling is electricity derived from preferably not fossil based fuels, like from nuclear fuels or from renewable energy. The process comprises electrolysing water, and then using hydrogen to reduce externally supplied carbon dioxide to carbon monoxide, then using so produced carbon monoxide together with any externally supplied carbon monoxide and hydrogen in Fischer-Tropsch reactors, with upstream upgrading to desired specification fuels—for example, gasoline, jet fuel, kerosene, diesel fuel, and others. Energy released in some of these processes is used by other processes. Using adiabatic temperature changes and isothermal pressure changes for gas processing and separation, large amounts of required energy are internally recycled using electric and heat distribution lines. Phase conversion of working fluid is used in heat distribution lines for increased energy efficiency. The resulting use of electric energy is less than 1.4 times the amount of the high heating value of combustion of so produced hydrocarbon compounds when carbon dioxide is converted to carbon monoxide in the invention, and less than 0.84 when carbon monoxide is the source.
103 Citations
91 Claims
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1-80. -80. (canceled)
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81. A method for producing hydrocarbon compounds comprising,
a) generating hydrogen gas from water in an electrolyzer b) feeding carbon dioxide gas and at least a portion of said hydrogen gas to a reverse water gas shift reactor to generate a gaseous stream including at least water steam and syngas as a mixture of hydrogen gas and carbon monoxide gas, wherein b1) said reverse water gas shift reactor comprises serially connected reactors, b2) water steam is separated between said serially connected reactors, c) feeding a Fischer-Tropsch reactor with said syngas effluent from the reverse water gas reactor and, if given, residual carbon dioxide gas, to generate hydrocarbon compounds, and d) a temperature of a gas in the method is changed at least near adiabatically and/or a pressure of a gas in the method is changed at least near isothermally with the temperature being increased/decreased at least near adiabatically by compressing/expanding an incoming gas in a compressor/expander with using/generating electrical energy from/to an electric power line such that involved heat energy is less than 10% of the used/generated electrical energy and the pressure is increased/decreased at least near isothermally by compressing/expanding an incoming gas in a compressor/expander with using/generating electrical energy from/to an electric power line and cooling/heating to compressed/expanded gas with delivering heat to/taking heat from a heat distribution line such that the absolute temperature ° - K of the processed gas deviates less than 10% from the absolute temperature °
K of the incoming gas. - View Dependent Claims (82, 83, 84, 85)
- K of the processed gas deviates less than 10% from the absolute temperature °
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86. A system for producing hydrocarbon compounds comprising:
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a) an electrolyzer for generating hydrogen gas from water; b) a plurality of reverse water gas shift reactors, wherein each reverse water gas shift reactor generates a gaseous stream including at least water steam and syngas as a mixture of hydrogen gas and carbon monoxide gas, wherein a first reverse water gas shift reactor of the plurality of reverse water gas shift reactors is supplied with carbon dioxide gas and at least a portion of the hydrogen gas generated by the electrolyzer, wherein the plurality of reverse water gas shift reactors are serially connected, and wherein water steam is separated between serially connected reactors; c) a Fischer-Tropsch reactor for generating hydrocarbon compounds from the syngas effluent of at least one reverse water gas reactor; d) at least one compressor for compressing an incoming gas; and e) at least one expander for expanding an incoming gas, wherein a temperature of at least one gas of the system is changed at least near adiabatically, wherein the temperature is increased at least near adiabatically by compressing an incoming gas in the compressor using electrical energy from an electric power source such that involved heat energy is less than 10% of the used electrical energy, and wherein the temperature is decreased at least near adiabatically by expanding an incoming gas in the expander generating electrical energy, such that involved heat energy is less than 10% of the generated electrical energy. - View Dependent Claims (87, 88, 89, 90, 91)
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Specification