Carbonaceous feedstocks for forming carbon allotropes
AssigneesExxonMobil Upstream Research Company, Solid Carbon Products, LLC
InventorsRobert D. Denton, Dallas B. Noyes, Russell J. Koveal, JR., Terry A. Ring
Life of this patent
Estimating the term…
Abstract
Methods and systems are provided for forming carbon allotropes. An exemplary method includes treating a carbonaceous compound to form a feedstock that includes at least about 10 mol % oxygen, at least about 10 mol % carbon, and at least about 20 mol % hydrogen. Carbon allotropes are formed from the feedstock in a reactor in a Bosch reaction at a temperature of at least about 500° C. The carbon allotropes are separated from a reactor effluent stream.
Claims32
A method for forming carbon allotropes, comprising:
- treating a carbonaceous compound to form a feedstock comprising at least about 10 mol % oxygen, at least about 10 mol % carbon, and at least about 20 mol % hydrogen;
- forming carbon allotropes from the feedstock in a reactor in a Bosch reaction at a temperature of at least about 500° C.;
- and
- separating the carbon allotropes from a reactor effluent stream.
A system for the production of carbon allotropes, comprising:
- a carbonaceous compound, wherein the carbonaceous compound is treated to form a feedstock comprising at least about 10 mol % oxygen, at least about 10 mol % carbon, and at least about 20 mol % hydrogen;
- a feed gas heater configured to heat the feedstock with waste heat from a waste gas stream;
- a reactor configured to form carbon allotropes from the feedstock in a Bosch or Bosch like Reverse Gasification reaction;
- a separator configured to separate the carbon allotropes from a reactor effluent stream forming the waste gas stream;
- and
- a water removal system, comprising an ambient temperature heat exchanger and separator configured to separate the bulk of the water from the waste gas stream to form a dry waste gas stream.
A reaction system for forming carbon nanotubes, comprising:
- a treatment system configured to form a feedstock from a carbonaceous compound, wherein the feedstock comprises at least about 10 mol % oxygen, at least about 10 mol % carbon, and at least about 20 mol % hydrogen;
- a purification system configured to remove compounds comprising elements other than carbon, hydrogen, and oxygen from the feedstock;
- a feed heater upstream of the reactor, wherein the feed heater is configured to convert the feedstock to a gaseous stream and to heat the feedstock prior to injection into a reactor;
- a reactor configured to form carbon nanotubes from the gaseous stream using a Bosch or Bosch like Reverse Gasification reaction;
- a separation system downstream of the reactor, wherein the separation system is configured to remove carbon nanotubes from an effluent from the reactor;
- a feed heater downstream of the separation system, wherein the feed heater comprises a heat exchanger configured to heat a feed gas stream for a following reactor using waste heat from the effluent from the reactor;
- an ambient temperature heat exchanger downstream of the feed heater, wherein the ambient temperature heat exchanger is configured to remove water from the effluent, forming a waste stream;
- a compressor configured to increase the pressure of the waste stream;
- an ambient temperature heat exchanger downstream of the compressor, configured to remove water from the waste stream;
- a gas fractionation system configured to separate the waste stream into a methane enriched stream and a carbon dioxide enriched stream;
- and
- a mixer configured to blend the methane enriched stream or the carbon dioxide enriched stream into an initial feed stream.
Dependencies are inferred from the claim text.