Patents by Inventor Winnifred De Graaf

Winnifred De Graaf 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: 20090294103
    Abstract: Process to reduce the temperature of a hydrogen and carbon monoxide containing gas by contacting the gas with a metal alloy surface having a lower temperature than the temperature of the gas, wherein the metal alloy surface comprises between 0 and 20 wt % iron, between 0 and 5 wt % aluminium, between 0 and 5 wt % silicon, between 20 and 50 wt % chromium and at least 35 wt % nickel, wherein the metal alloy surface maintains it lower temperature than the temperature of the gas by making use of coolant water.
    Type: Application
    Filed: August 12, 2009
    Publication date: December 3, 2009
    Inventors: Franciscus Gerardus VAN DONGEN, Winnifred De Graaf, Thian Hoey Tio, Anthonij Wolfert
  • Patent number: 7597067
    Abstract: A process to reduce the temperature of a hydrogen and carbon monoxide containing gas by contacting the gas with a metal alloy surface having a lower temperature than the temperature of the gas, wherein the metal alloy surface has between 0 and 20 wt % iron, between 0 and 5 wt % aluminium, between 0 and 5 wt % silicon, between 20 and 50 wt % chromium and at least 35 wt % nickel, wherein the metal alloy surface maintains it lower temperature than the temperature of the gas by making use of coolant water.
    Type: Grant
    Filed: October 22, 2002
    Date of Patent: October 6, 2009
    Assignee: Shell Oil Company
    Inventors: Franciscus Gerardus Van Dongen, Winnifred De Graaf, Thian Hoey Tio, Anthonij Wolfert
  • Patent number: 7422706
    Abstract: A process for the preparation of hydrogen and carbon monoxide containing gas from a gaseous hydrocarbon feedstock by performing the following steps: (a) partial oxidation of part of the feedstock thereby obtaining a first gaseous mixture of hydrogen and carbon monoxide; and, (b) catalytic steam reforming of part of the gaseous feedstock in a Convective Steam Reformer having a tubular reactor provided with one or more tubes containing a reforming catalyst, wherein the exterior of the tubes of the tubular reactor is used to cool the hot gas as obtained in step (a) and wherein the exterior of the tubes is a metal alloy surface having between 0 wt % and 20 wt % iron.
    Type: Grant
    Filed: October 22, 2002
    Date of Patent: September 9, 2008
    Assignee: Shell Oil Company
    Inventors: Franciscus Gerardus Van Dongen, Winnifred De Graaf, Thian Hoey Tio, Anthonij Wolfert
  • Patent number: 6852762
    Abstract: The invention relates to a process for producing liquid hydrocarbons from a hydrocarbonaceous feedstock involving: (i) catalylically reforming at least part of the hydrocarbonaceous feedstock at elevated temperature and pressure with steam in at least one reforming zone; (ii) heating the reforming zone(s) by means of a carbon dioxide containing heating gas containing a product obtained by partial oxidation of the reformer product obtained in step (i) and carbon dioxide depleted light product obtained in step (vi) with an oxygen-containing gas in an oxidation zone; (iii) separating carbon dioxide from cooled down heating gas obtained in step (ii); (iv) catalytically converting at least part of the carbon dioxide depleted gas steam obtained in step (iii) at elevated temperature and pressure into normally liquid hydrocarbons; (v) separating product stream obtained in step (iv) into a light product having mainly unconverted synthesis gas, inerts and light hydrocarbons and a heavy product; having mainly normally
    Type: Grant
    Filed: June 24, 2002
    Date of Patent: February 8, 2005
    Assignee: Shell Oil Company
    Inventors: Winnifred De Graaf, Abdul Razak Mohamad Ali, Thian Hoey Tio
  • Publication number: 20040262579
    Abstract: A process to reduce the temperature of a hydrogen and carbon monoxide containing gas by contacting the gas with a metal alloy surface having a lower temperature than the temperature of the gas, wherein the metal alloy surface has between 0 and 20 wt % iron, between 0 and 5 wt % aluminium, between 0 and 5 wt % silicon, between 20 and 50 wt % chromium and at least 35 wt % nickel, wherein the metal alloy surface maintains it lower temperature than the temperature of the gas by making use of coolant water.
    Type: Application
    Filed: April 21, 2004
    Publication date: December 30, 2004
    Inventors: Franciscus Gerardus Van Dongen, Winnifred De Graaf, Thian Hoey Tio, Anthonij Wolfert
  • Publication number: 20040241086
    Abstract: A process for the preparation of hydrogen and carbon monoxide containing gas from a gaseous hydrocarbon feedstock by performing the following steps:
    Type: Application
    Filed: April 21, 2004
    Publication date: December 2, 2004
    Inventors: Franciscus Gerardus Van Dongen, Winnifred De Graaf, Thian Hoey Tio, Anthonij Wolfert
  • Publication number: 20040242707
    Abstract: The invention relates to a process for producing liquid hydrocarbons from a hydrocarbonaceous feedstock involving:
    Type: Application
    Filed: December 22, 2003
    Publication date: December 2, 2004
    Inventors: Winnifred De Graaf, Abdul Razak Mohamad Ali, Thian Hoey Tio
  • Publication number: 20040220443
    Abstract: A process for the preparation of liquid hydrocarbons and a clean gas stream suitable as feed and/or fuel gas from synthesis gas involving the following steps:
    Type: Application
    Filed: February 23, 2004
    Publication date: November 4, 2004
    Inventors: Johannes Didericus De Graaf, Winnifred De Graaf