A process for producing methane or methanol includes combining a hydrogenation catalyst, hydrogen, and CO.sub.2 with a condensed phase solution comprising an amine under conditions effective to form methane or methanol, and water. A process for coproduction of methanol and a glycol includes combining an epoxide, a hydrogenation catalyst, hydrogen, and CO.sub.2 with a condensed phase solution comprising an amine under conditions effective to form methanol and a glycol.

A method of removing CO from a mixture of CO and saturated and unsaturated hydrocarbons CO to CO.sub.2 is provided. In one embodiment, the method is to contact feed stream with an oxygen transfer agent; and then oxidize at least a portion of the CO to CO.sub.2 to produce a stream enriched in CO.sub.2. The saturated and unsaturated hydrocarbons in the feed are not further oxidized during the oxidation. The oxygen transfer agent includes at least one of: i) water; ii) at least one reducible metal oxide; iii) at least one reducible chalcogen; or mixtures thereof. In another embodiment, the CO is converted to methane. The unsaturated hydrocarbons in the feed are not hydrogenated. In both of these alternatives, the CO.sub.2 or methane are then removed. Systems for removing the CO are also provided.

A method of removing CO from a mixture of CO and saturated and unsaturated hydrocarbons CO to CO.sub.2 is provided. In one embodiment, the method is to contact feed stream with an oxygen transfer agent; and then oxidize at least a portion of the CO to CO.sub.2 to produce a stream enriched in CO.sub.2. The saturated and unsaturated hydrocarbons in the feed are not further oxidized during the oxidation. The oxygen transfer agent includes at least one of: i) water; ii) at least one reducible metal oxide; iii) at least one reducible chalcogen; or mixtures thereof. In another embodiment, the CO is converted to methane. The unsaturated hydrocarbons in the feed are not hydrogenated. In both of these alternatives, the CO.sub.2 or methane are then removed. Systems for removing the CO are also provided.

A hydrocarbon-forming gas compression method comprising: a hydrate formation step in which water and hydrate-forming gas are mixed at a first pressure and a first temperature, resulting in the formation of hydrate; a decomposition step in which the hydrate is warmed, and the hydrate is decomposed to re-generate hydrate-forming gas at a second pressure higher than the first pressure.

A hydrocarbon-forming gas compression method comprising: a hydrate formation step in which water and hydrate-forming gas are mixed at a first pressure and a first temperature, resulting in the formation of hydrate; a decomposition step in which the hydrate is warmed, and the hydrate is decomposed to re-generate hydrate-forming gas at a second pressure higher than the first pressure.

Provided is a first step of causing hydrogen and carbon oxide to react with each other in a presence of a first catalyst to obtain a first fuel gas 2 that contains 2% to 10% hydrogen by volume after dehydration; and a second step of consuming the hydrogen in the first fuel gas 2 to obtain a second fuel gas 4 with a reduced hydrogen concentration. The first catalyst includes a methanation catalyst. The second step includes an exothermic reaction that generates heat of 60 kJ or more per mole of hydrogen, and the exothermic reaction is a reaction through which the hydrogen in the first fuel gas 2 and a predetermined reactant 3 are caused to react with each other in a presence of a second catalyst to generate water or a paraffin hydrocarbon with two to four carbon atoms.

Provided is a first step of causing hydrogen and carbon oxide to react with each other in a presence of a first catalyst to obtain a first fuel gas 2 that contains 2% to 10% hydrogen by volume after dehydration; and a second step of consuming the hydrogen in the first fuel gas 2 to obtain a second fuel gas 4 with a reduced hydrogen concentration. The first catalyst includes a methanation catalyst. The second step includes an exothermic reaction that generates heat of 60 kJ or more per mole of hydrogen, and the exothermic reaction is a reaction through which the hydrogen in the first fuel gas 2 and a predetermined reactant 3 are caused to react with each other in a presence of a second catalyst to generate water or a paraffin hydrocarbon with two to four carbon atoms.

Provided is a first step of causing hydrogen and carbon oxide to react with each other in a presence of a first catalyst to obtain a first fuel gas 2 that contains 2% to 10% hydrogen by volume after dehydration; and a second step of consuming the hydrogen in the first fuel gas 2 to obtain a second fuel gas 4 with a reduced hydrogen concentration. The first catalyst includes a methanation catalyst. The second step includes an exothermic reaction that generates heat of 60 kJ or more per mole of hydrogen, and the exothermic reaction is a reaction through which the hydrogen in the first fuel gas 2 and a predetermined reactant 3 are caused to react with each other in a presence of a second catalyst to generate water or a paraffin hydrocarbon with two to four carbon atoms.

A plasma carbon sequestration system and method are disclosed, wherein in the plasma carbon sequestration system, a first channel and a second channel of a plasma reactor are each provided with a flow controller, the plasma reactor is connected to a high voltage via a high voltage electrode and grounded via a ground electrode, water, or hydrogen, or methane is mixed with carbon dioxide respectively, to be introduced into the plasma reactor in a predetermined proportion under the control of the flow controllers, and a condenser is connected to the plasma reactor to condense a conversion product, and reactants which are not completely reacted from the plasma reactor, and is selectively used for circulation in the plasma reactor, thereby realizing environment-friendly treatment without a catalyst by a room temperature plasma technology.

A plasma carbon sequestration system and method are disclosed, wherein in the plasma carbon sequestration system, a first channel and a second channel of a plasma reactor are each provided with a flow controller, the plasma reactor is connected to a high voltage via a high voltage electrode and grounded via a ground electrode, water, or hydrogen, or methane is mixed with carbon dioxide respectively, to be introduced into the plasma reactor in a predetermined proportion under the control of the flow controllers, and a condenser is connected to the plasma reactor to condense a conversion product, and reactants which are not completely reacted from the plasma reactor, and is selectively used for circulation in the plasma reactor, thereby realizing environment-friendly treatment without a catalyst by a room temperature plasma technology.