Metallic based hydrocarbon pyrolysis
A reaction process includes introducing hydrocarbon reactants into a vessel, reacting the hydrocarbon reactants in contact with the gas phase catalyst in the vessel to produce reaction products comprising solid carbon and a gas phase product, separating the solid carbon from the gas phase products and the gas phase catalyst to produce a solid carbon product, condensing the gas phase catalyst to produce a condensed catalyst, and returning the condensed catalyst to the liquid catalyst reservoir. The vessel comprises a gas phase catalyst and a liquid catalyst reservoir containing a liquid catalyst.
1 . A reaction process comprising:
heating a liquid phase catalyst in a liquid catalyst section to produce a gas phase catalyst;
passing the gas phase catalyst into a reaction passage comprising one or more pipes or connections;
introducing a hydrocarbon reactant into the reaction passage in contact with the gas phase catalyst, wherein the hydrocarbon reactant is introduced via one or a plurality of injection points along an axial length of each of the one or more pipes or connections;
reacting the hydrocarbon reactant in contact with the gas phase catalyst in the reaction passage to produce a product gas comprising hydrogen, unreacted hydrocarbon reactant, and entrained solid carbon, wherein the hydrocarbon reactant does not contact liquid phase catalyst in the reaction passage or the liquid catalyst section;
removing the product gas comprising the entrained solid carbon from the reaction passage;
separating the entrained solid carbon from the product gas;
cooling the product gas after separating the solid carbon therefrom, whereby the gas phase catalyst in the product gas condenses and the condensed catalyst separates from the product gas; and
returning the condensed catalyst to the liquid catalyst section,
wherein the solid carbon is not wetted by the liquid phase catalyst.
2 . The reaction process of claim 1 , wherein introducing the hydrocarbon reactant comprises:
introducing the hydrocarbon reactant at a plurality of points along the axial length of each of the one or more pipes or connections of the reaction passage.
3 . The reaction process of claim 1 , further comprising:
heating the reaction passage during the reacting.
4 . The reaction process of claim 1 , wherein a portion of the solid carbon is present in the condensed catalyst, and further comprising:
separating the solid carbon from the condensed catalyst prior to returning the condensed catalyst to the liquid catalyst section.
5 . The reaction process of claim 1 , wherein the hydrocarbon reactants comprise natural gas components, biomass, polymers, and combinations thereof.
6 . The reaction process of claim 1 , wherein the catalyst is a metal comprising at least one of: lithium, sodium, potassium, rubidium, cesium, magnesium, calcium, aluminum, or mixtures thereof.
7 . The reaction process of claim 1 , wherein the liquid catalyst contains a diluent comprising at least one of: bismuth, tin, gallium, lead, indium, or mixtures thereof.
8 . The reaction process of claim 1 , wherein the reacting occurs within the reaction passage at a temperature between 600° C. and 1200° C., and at a pressure between 1 bar and 50 bar.
9 . The reaction process of claim 1 , wherein the solid carbon product is removed from the reaction passage by pneumatic conveyance in a gas stream.
10 . The reaction process of claim 1 , wherein the reaction passage comprises a plurality of pipes or connections.
11 . The reaction process of claim 1 , wherein heating the liquid phase catalyst to produce the gas phase catalyst is effected in a boiler configured to generate the gas phase catalyst from the liquid phase catalyst disposed in the boiler and pass the gas phase catalyst to the reaction passage.
12 . The reaction process of claim 11 , wherein condensing the gas phase catalyst to produce the condensed catalyst is effected in a condenser having an inlet fluidly connected with the reaction passage and an outlet fluidly connected via a recycle line with the boiler.
13 . The reaction process of claim 12 , wherein a portion of the solid carbon is present in the condensed catalyst, and wherein the process further comprises separating the solid carbon from condensed catalyst via a solid/liquid separator on the recycle line.
14 . The reaction process of claim 1 , further comprising heating the reaction passage to a temperature above the boiling point of the gas phase catalyst.
15 . The reaction process of claim 14 , wherein heating the reaction passage comprises externally heating the reaction passage to a temperature above a vaporization temperature of a metal of the liquid phase catalyst.
16 . The reaction process of claim 1 , wherein the hydrocarbon reactant is introduced via a plurality of injection points along the axial length of each of the one or more pipes or connections.