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A method to remove a metals impurity from a petroleum feedstock for use in a power generating process is provided. The method comprising the steps of mixing a heated feedstock with a heated water stream in a mixing device to produce a mixed stream; introducing the mixed stream to a supercritical wat

A method to remove a metals impurity from a petroleum feedstock for use in a power generating process is provided. The method comprising the steps of mixing a heated feedstock with a heated water stream in a mixing device to produce a mixed stream; introducing the mixed stream to a supercritical water reactor in the absence of externally provided hydrogen and externally provided oxidizing agent to produce a reactor effluent comprising a refined petroleum portion; cooling the reactor effluent to produce a cooled stream; feeding the cooled stream to a rejecter configured to separate a sludge fraction to produce a de-sludged stream; reducing the pressure of the de-sludged stream to produce a depressurized product; separating the depressurized product to produce a gas phase product and a liquid product; separating the liquid product to produce a petroleum product, having a reduced asphaltene content, reduced concentration of metals impurity, and reduced sulfur.

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1. A system to remove a metals impurity from a petroleum feedstock for use in a power generating process, the system comprising: a mixing device, the mixing device configured to produce a mixed stream from a heated feedstock and a heated water stream, the heated feedstock comprising the metals impur

1. A system to remove a metals impurity from a petroleum feedstock for use in a power generating process, the system comprising: a mixing device, the mixing device configured to produce a mixed stream from a heated feedstock and a heated water stream, the heated feedstock comprising the metals impurity,wherein the mixed stream comprises an asphaltene and resin portion, a hydrocarbon portion, and a supercritical water portion, wherein the mixed stream is at a temperature less than 400 deg C.;a supercritical water reactor, the supercritical water reactor fluidly connected to the mixing device, the supercritical water reactor in the absence of externally provided hydrogen and externally provided oxidizing agent and configured to produce a reactor effluent, the reactor effluent comprising a refined petroleum portion, converted metals, and an amount of solid coke,wherein demetallization reactions and a set of conversion reactions occur in the supercritical water reactor, wherein the demetallization reactions are operable to convert the metals impurity to converted metals, wherein the set of conversion reactions is operable to refine the hydrocarbon portion in the presence of the supercritical water portion to produce the refined petroleum portion;a cooling device, the cooling device fluidly connected to the supercritical water reactor, the cooling device configured to cooling the reactor effluent to produce a cooled stream, wherein the cooled stream is at a temperature below the critical temperature of water;a rejecter separator process vessel, the rejecter separator process vessel fluidly connected to the cooling device, the rejecter separator process vessel configured to separate a sludge fraction from the cooled stream to produce a de-sludged stream, the rejecter separator process vessel having a rejecter temperature, the sludge fraction comprising the asphaltene and resin portion and the converted metals;a depressurizing device, the depressurizing device fluidly connected to the rejecter separator process vessel, the depressurizing device configured to reduce the pressure of the de-sludged stream to produce a depressurized product;a gas-liquid separator, the gas-liquid separator fluidly connected to the depressurizing device, the depressurizing device configured to separate the depressurized product to produce a gas phase product and a liquid product;an oil-water separator, the oil-water separator fluidly connected to the gas-liquid separator, the oil-water separator configured to separate the liquid product to produce a petroleum product and a water product, the petroleum product having a liquid yield, the petroleum product having a reduced asphaltene content, reduced concentration of metals impurity, and reduced sulfur as compared to the petroleum feedstock. 2. The system of claim 1, wherein the petroleum feedstock is a petroleum-based hydrocarbon selected from the group consisting of whole range crude oil, reduced crude oil, fuel oil, refinery streams, residues from refinery streams, cracked product streams from crude oil refinery, atmospheric residue streams, vacuum residue streams, coal-derived hydrocarbons, liquefied coal, bitumen, biomass-derived hydrocarbons, and hydrocarbon streams from other petrochemical processes. 3. The system of claim 1, wherein the metals impurity is selected from the group consisting of vanadium, nickel, iron and combinations thereof. 4. The system of claim 1, wherein the metals impurity comprises a metal porphyrin. 5. The system of claim 1, wherein the set of conversion reactions is selected from the consisting of upgrading, desulfurization, denitrogenation, deoxygenation, cracking, isomerization, alkylation, condensation, dimerization, hydrolysis, hydration, and combinations thereof. 6. The system of claim 1, wherein the rejecter separator process vessel comprises a rejecter adsorbent. 7. The system of claim 1, wherein the rejecter separator process vessel comprises a rejecter solvent. 8. The system of claim 1, wherein the rejecter separator process vessel is selected from the group consisting of a cyclone-type vessel, a tubular-type vessel, a CSTR, and a centrifuge. 9. The system of claim 1, wherein the amount of solid coke in the reactor effluent is less than 1.5 wt % by petroleum feedstock. 10. The system of claim 1, wherein the concentration of metals impurity in the petroleum product is less than 2 ppm by wt. 11. The system of claim 1, wherein the liquid yield of the petroleum product is greater than 96%. 12. A system to remove a metals impurity from a petroleum feedstock for use in a power generating process, the system comprising: a mixing device, the mixing device configured to produce a mixed stream from a heated feedstock and a heated water stream, the heated feedstock comprising the metals impurity, wherein the mixed stream comprises an asphaltene and resin portion, a hydrocarbon portion, and a supercritical water portion, wherein the mixed stream is at a temperature less than 400 deg C.;a supercritical water reactor, the supercritical water reactor fluidly connected to the mixing device, the supercritical water reactor in the absence of externally provided hydrogen and externally provided oxidizing agent and configured to produce a reactor effluent, the reactor effluent comprising a refined petroleum portion, converted metals, and an amount of solid coke, wherein demetallization reactions and a set of conversion reactions occur in the supercritical water reactor, wherein the demetallization reactions are operable to convert the metals impurity to converted metals, wherein the set of conversion reactions is operable to refine the hydrocarbon portion in the presence of the supercritical water portion to produce the refined petroleum portion;a cooling device, the cooling device fluidly connected to the supercritical water reactor, the cooling device configured to cooling the reactor effluent to produce a cooled stream, wherein the cooled stream is at a temperature below the critical temperature of water;a depressurizing device, the depressurizing device fluidly connected to the cooling device, the depressurizing device configured to reduce the pressure of the cooled stream to produce a depressurized stream, wherein the depressurized stream comprises the refined petroleum portion, an asphaltene fraction, a water fraction, and a gas phase product fraction;a gas-liquid separator, the gas-liquid separator fluidly connected to the depressurizing device, the depressurizing device configured to separate the depressurized stream to produce a gas product and a liquid phase stream;an oil-water separator, the oil-water separator fluidly connected to the gas-liquid separator, the oil-water separator configured to separate the liquid phase stream to produce a liquid-phase petroleum stream and a water phase stream;a solvent extractor, the solvent extractor fluidly connected to the oil-water separator, the solvent extractor configured to extract a petroleum product from the liquid-phase petroleum stream to leave a metal-containing fraction, the petroleum product having reduced asphaltene content, reduced concentration of metals impurity, and reduced sulfur as compared to the petroleum feedstock. 13. The system of claim 12, wherein the petroleum feedstock is a petroleum-based hydrocarbon selected from the group consisting of whole range crude oil, reduced crude oil, fuel oil, refinery streams, residues from refinery streams, cracked product streams from crude oil refinery, atmospheric residue streams, vacuum residue streams, coal-derived hydrocarbons, liquefied coal, bitumen, biomass-derived hydrocarbons, and hydrocarbon streams from other petrochemical processes. 14. The system of claim 12, wherein the metals impurity is selected from the group consisting of vanadium, nickel, iron and combinations thereof. 15. The system of claim 12, wherein the metals impurity comprises a metal porphyrin. 16. The system of claim 12, wherein the set of conversion reactions is selected from the consisting of upgrading, desulfurization, denitrogenation, deoxygenation, cracking, isomerization, alkylation, condensation, dimerization, hydrolysis, hydration, and combinations thereof. 17. The system of claim 12, wherein the solvent extractor comprises a solvent deasphalting process. 18. The system of claim 12, wherein the amount of solid coke in the reactor effluent is less than 1.5 wt % by petroleum feedstock. 19. The system of claim 12, wherein the concentration of metals impurity in the petroleum product is less than 2 ppm by wt.