Patents by Inventor Alkis S. Rappas

Alkis S. Rappas has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20150299588
    Abstract: Particulate compositions are described comprising an intimate mixture of a petroleum coke, coal and a gasification catalyst, where the gasification catalyst is loaded onto at least the coal for gasification in the presence of steam to yield a plurality of gases including methane and at least one or more of hydrogen, carbon monoxide, and other higher hydrocarbons are formed. Processes are also provided for the preparation of the particulate compositions and converting the particulate composition into a plurality of gaseous products.
    Type: Application
    Filed: June 30, 2015
    Publication date: October 22, 2015
    Inventors: Robert A. Spitz, Alkis S. Rappas
  • Patent number: 8734547
    Abstract: Processes are provided for preparing a substantially free-flowing alkali metal gasification catalyst-loaded carbonaceous particulate suitable for use as a feedstock for the production of gaseous products, and in particular methane, via the catalytic gasification of the catalyst-loaded carbonaceous particulate in the presence of steam.
    Type: Grant
    Filed: December 29, 2009
    Date of Patent: May 27, 2014
    Assignee: Greatpoint Energy, Inc.
    Inventors: Alkis S. Rappas, Robert A. Spitz
  • Patent number: 8734548
    Abstract: Processes are provided for preparing a substantially free-flowing alkali metal gasification catalyst-loaded coal particulate suitable for use as a feedstock for the production of gaseous products, and in particular methane, via the catalytic gasification of the catalyst-loaded coal particulate in the presence of steam.
    Type: Grant
    Filed: December 29, 2009
    Date of Patent: May 27, 2014
    Assignee: Greatpoint Energy, Inc.
    Inventors: Alkis S. Rappas, Robert A. Spitz, George Frederick Salem
  • Patent number: 8648121
    Abstract: The present invention relates to processes for hydromethanating a nickel-containing (and optionally vanadium-containing) carbonaceous feedstock while recovering at least a portion of the nickel content (and optionally vanadium content) originally present in the carbonaceous feedstock.
    Type: Grant
    Filed: February 22, 2012
    Date of Patent: February 11, 2014
    Assignee: Greatpoint Energy, Inc.
    Inventors: Alkis S. Rappas, Robert A. Spitz
  • Patent number: 8557878
    Abstract: The present invention relates to processes and apparatuses for hydromethanating a vanadium-containing carbonaceous feedstock while recovering at least a portion of the vanadium content originally present in the carbonaceous feedstock.
    Type: Grant
    Filed: April 26, 2011
    Date of Patent: October 15, 2013
    Assignee: Greatpoint Energy, Inc.
    Inventors: Alkis S. Rappas, Robert A. Spitz
  • Patent number: 8297542
    Abstract: Particulate compositions are described comprising an intimate mixture of a coal and a gasification catalyst in the presence of steam to yield a plurality of gases including methane and at least one or more of hydrogen, carbon monoxide, carbon dioxide, hydrogen sulfide, ammonia and other higher hydrocarbons are formed. Processes are also provided for the preparation of the particulate compositions and converting the particulate composition into a plurality of gaseous products.
    Type: Grant
    Filed: February 27, 2009
    Date of Patent: October 30, 2012
    Assignee: Greatpoint Energy, Inc.
    Inventors: Alkis S. Rappas, George Frederick Salem
  • Publication number: 20120271072
    Abstract: The present invention relates to processes for hydromethanating a carbonaceous feedstock to a methane-enriched synthesis gas and a char by-product, with catalyst recovery from the by-product char to generate a spent char, and with treatment of the spent char to generate a carbon rich portion which is ultimately recycled to the hydromethanation reactor to increase overall carbon utilization and increase yields of product gas (per unit of feedstock).
    Type: Application
    Filed: April 19, 2012
    Publication date: October 25, 2012
    Applicant: GREATPOINT ENERGY, INC.
    Inventors: Earl T. Robinson, Alkis S. Rappas
  • Patent number: 8286901
    Abstract: Particulate compositions are described comprising an intimate mixture of a coal and a gasification catalyst. The particulate compositions are gasified in the presence of steam to yield a plurality of gases including methane and at least one or more of hydrogen, carbon monoxide, carbon dioxide, hydrogen sulfide, ammonia and other higher hydrocarbons. Processes are also provided for the preparation of the particulate compositions and converting the particulate composition into a plurality of gaseous products.
    Type: Grant
    Filed: February 27, 2009
    Date of Patent: October 16, 2012
    Assignee: Greatpoint Energy, Inc.
    Inventors: Alkis S. Rappas, George Frederick Salem
  • Publication number: 20120213680
    Abstract: The present invention relates to processes for hydromethanating a nickel-containing (and optionally vanadium-containing) carbonaceous feedstock while recovering at least a portion of the nickel content (and optionally vanadium content) originally present in the carbonaceous feedstock.
    Type: Application
    Filed: February 22, 2012
    Publication date: August 23, 2012
    Applicant: GREATPOINT ENERGY, INC.
    Inventors: Alkis S. Rappas, Robert A. Spitz
  • Patent number: 8163048
    Abstract: The present invention relates to catalyst-loaded coal compositions having a moisture content of less than about 6 wt %, a process for the preparation of catalyst-loaded coal compositions, and an integrated process for the gasification of the catalyst-loaded coal compositions. The catalyst-loaded coal compositions can be prepared by a diffusive catalyst loading process that provides for a highly dispersed catalyst that is predominantly associated with the coal matrix, such as by ion-exchange.
    Type: Grant
    Filed: July 23, 2008
    Date of Patent: April 24, 2012
    Assignee: Greatpoint Energy, Inc.
    Inventors: Alkis S. Rappas, George Frederick Salem, Edwin J. Hippo
  • Publication number: 20110262323
    Abstract: The present invention relates to processes and apparatuses for hydromethanating a vanadium-containing carbonaceous feedstock while recovering at least a portion of the vanadium content originally present in the carbonaceous feedstock.
    Type: Application
    Filed: April 26, 2011
    Publication date: October 27, 2011
    Applicant: GREATPOINT ENERGY, INC.
    Inventors: Alkis S. Rappas, Robert A. Spitz
  • Patent number: 7901644
    Abstract: Processes are described for the extraction and recovery of alkali metal from the char that results from catalytic gasification of a carbonaceous material. Among other steps, the processes of the invention include a hydrothermal leaching step in which a slurry of insoluble particulate comprising insoluble alkali metal compounds is treated with carbon dioxide and steam at elevated temperatures and pressures to effect the conversion of insoluble alkali metal compounds to soluble alkali metal compounds. Further, processes are described for the catalytic gasification of a carbonaceous material where a substantial portion of alkali metal is extracted and recovered from the char that results from the catalytic gasification process.
    Type: Grant
    Filed: December 23, 2008
    Date of Patent: March 8, 2011
    Assignee: GreatPoint Energy, Inc.
    Inventors: Alkis S. Rappas, Robert A. Spitz
  • Patent number: 7897126
    Abstract: Processes are described for the extraction and recovery of alkali metal from the char that results from catalytic gasification of a carbonaceous material. Among other steps, the processes of the invention include a hydrothermal leaching step in which a slurry of insoluble particulate comprising insoluble alkali metal compounds is treated with carbon dioxide and steam at elevated temperatures and pressures to effect the conversion of insoluble alkali metal compounds to soluble alkali metal compounds. Further, processes are described for the catalytic gasification of a carbonaceous material where a substantial portion of alkali metal is extracted and recovered from the char that results from the catalytic gasification process.
    Type: Grant
    Filed: December 23, 2008
    Date of Patent: March 1, 2011
    Assignee: Greatpoint Energy, Inc.
    Inventors: Alkis S. Rappas, Robert A. Spitz
  • Publication number: 20100168495
    Abstract: Processes are provided for preparing a substantially free-flowing alkali metal gasification catalyst-loaded carbonaceous particulate suitable for use as a feedstock for the production of gaseous products, and in particular methane, via the catalytic gasification of the catalyst-loaded carbonaceous particulate in the presence of steam.
    Type: Application
    Filed: December 29, 2009
    Publication date: July 1, 2010
    Applicant: GREATPOINT ENERGY, INC.
    Inventors: Alkis S. Rappas, Robert A. Spitz
  • Publication number: 20100168494
    Abstract: Processes are provided for preparing a substantially free-flowing alkali metal gasification catalyst-loaded coal particulate suitable for use as a feedstock for the production of gaseous products, and in particular methane, via the catalytic gasification of the catalyst-loaded coal particulate in the presence of steam.
    Type: Application
    Filed: December 29, 2009
    Publication date: July 1, 2010
    Applicant: GREATPOINT ENERGY, INC.
    Inventors: Alkis S. Rappas, Robert A. Spitz, George Frederick Salem
  • Publication number: 20090217590
    Abstract: Particulate compositions are described comprising an intimate mixture of a coal and a gasification catalyst in the presence of steam to yield a plurality of gases including methane and at least one or more of hydrogen, carbon monoxide, carbon dioxide, hydrogen sulfide, ammonia and other higher hydrocarbons are formed. Processes are also provided for the preparation of the particulate compositions and converting the particulate composition into a plurality of gaseous products.
    Type: Application
    Filed: February 27, 2009
    Publication date: September 3, 2009
    Applicant: GREATPOINT ENERGY, INC.
    Inventors: Alkis S. Rappas, George Frederick Salem
  • Publication number: 20090217586
    Abstract: Particulate compositions are described comprising an intimate mixture of a coal and a gasification catalyst. The particulate compositions are gasified in the presence of steam to yield a plurality of gases including methane and at least one or more of hydrogen, carbon monoxide, carbon dioxide, hydrogen sulfide, ammonia and other higher hydrocarbons. Processes are also provided for the preparation of the particulate compositions and converting the particulate composition into a plurality of gaseous products.
    Type: Application
    Filed: February 27, 2009
    Publication date: September 3, 2009
    Applicant: GREATPOINT ENERGY, INC.
    Inventors: Alkis S. Rappas, George Frederick Salem
  • Publication number: 20090165383
    Abstract: Processes are described for the extraction and recovery of alkali metal from the char that results from catalytic gasification of a carbonaceous material. Among other steps, the processes of the invention include a hydrothermal leaching step in which a slurry of insoluble particulate comprising insoluble alkali metal compounds is treated with carbon dioxide and steam at elevated temperatures and pressures to effect the conversion of insoluble alkali metal compounds to soluble alkali metal compounds. Further, processes are described for the catalytic gasification of a carbonaceous material where a substantial portion of alkali metal is extracted and recovered from the char that results from the catalytic gasification process.
    Type: Application
    Filed: December 23, 2008
    Publication date: July 2, 2009
    Applicant: GreatPoint Energy, Inc.
    Inventors: Alkis S. Rappas, Robert A. Spitz
  • Publication number: 20090169448
    Abstract: Processes are described for the extraction and recovery of alkali metal from the char that results from catalytic gasification of a carbonaceous material. Among other steps, the processes of the invention include a hydrothermal leaching step in which a slurry of insoluble particulate comprising insoluble alkali metal compounds is treated with carbon dioxide and steam at elevated temperatures and pressures to effect the conversion of insoluble alkali metal compounds to soluble alkali metal compounds. Further, processes are described for the catalytic gasification of a carbonaceous material where a substantial portion of alkali metal is extracted and recovered from the char that results from the catalytic gasification process.
    Type: Application
    Filed: December 23, 2008
    Publication date: July 2, 2009
    Applicant: GREATPOINT ENERGY, INC.
    Inventors: Alkis S. Rappas, Robert A. Spitz
  • Publication number: 20090166588
    Abstract: Particulate compositions are described comprising an intimate mixture of a petroleum coke, coal and a gasification catalyst, where the gasification catalyst is loaded onto at least the coal for gasification in the presence of steam to yield a plurality of gases including methane and at least one or more of hydrogen, carbon monoxide, and other higher hydrocarbons are formed. Processes are also provided for the preparation of the particulate compositions and converting the particulate composition into a plurality of gaseous products.
    Type: Application
    Filed: December 23, 2008
    Publication date: July 2, 2009
    Applicant: GreatPoint Energy, Inc.
    Inventors: Robert A. Spitz, Alkis S. Rappas