Patents by Inventor Stewart Hlohloza

Stewart Hlohloza 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).

  • Removal of ultra-fine particles from a Fischer Tropsch Stream
    Publication number: 20100249485
    Abstract: This invention relates to processes for removing particles such as catalyst fines from hydrocarbon streams, such as a wax dried from a Fischer Tropsch reaction using centrifugation in combination with a treatment with an aqueous solution preferably containing an acid, or with an acid. According to an aspect of the invention, catalyst particles are removed from a wax derived from a Fischer Tropsch by pre-treating the hydrocarbon stream with an aqueous solution and forming a mixture comprising the hydrocarbon stream and 5-25% v/v organic acid solution; and introducing the mixture to a centrifuge and separating, from the mixture, a hydrocarbon stream, an aqueous solution and particles. The process may be a continuous and/or a batch process.
    Type: Application
    Filed: June 18, 2008
    Publication date: September 30, 2010
    Inventors: Masikana Millan Mdleleni, Cyril David Knottenbelt, Kgolole David Maripane, Nkululeko Stewart Hlohloza
  • Process for reducing the toxicity of hydrocarbons
    Patent number: 7429553
    Abstract: This invention relates to a method for reducing the toxicity of a mixture of hydrocarbons by means of fractional distillation, a distillate having a reduced toxicity and a composition including the distillate.
    Type: Grant
    Filed: May 15, 2007
    Date of Patent: September 30, 2008
    Assignee: Petroleum Oil and Gas Corporation of South Africa (Pty) Ltd.
    Inventors: Carl Dunlop, Stewart Hlohloza, Petrus Johannes Hoffmann, Cyril David Knottenbelt, Leon Walliser
  • Process for reducing the toxicity of hydrocarbons
    Patent number: 7326817
    Abstract: This invention relates to a method for reducing the toxicity of a mixture of hydrocarbons by means of fractional distillation, a distillate having a reduced toxicity and a composition including the distillate.
    Type: Grant
    Filed: October 27, 2004
    Date of Patent: February 5, 2008
    Assignee: Petroleum Oil and Gas Corporation of South Africa (Pty) Ltd.
    Inventors: Carl Dunlop, Stewart Hlohloza, Petrus Johannes Hoffmann, Cyril David Knottenbelt, Leon Walliser
  • PROCESS FOR REDUCING THE TOXICITY OF HYDROCARBONS
    Publication number: 20070213229
    Abstract: This invention relates to a method for reducing the toxicity of a mixture of hydrocarbons by means of fractional distillation, a distillate having a reduced toxicity and a composition including the distillate.
    Type: Application
    Filed: May 15, 2007
    Publication date: September 13, 2007
    Applicant: Petroleum Oil and Gas Corporation of South Africa (Pty) Ltd.
    Inventors: Carl Dunlop, Stewart Hlohloza, Petrus Hoffmann, Cyril Knottenbelt, Leon Walliser
  • Process for reducing the toxicity of hydrocarbons
    Publication number: 20050197256
    Abstract: This invention relates to a method for reducing the toxicity of a mixture of hydrocarbons by means of fractional distillation, a distillate having a reduced toxicity and a composition including the distillate.
    Type: Application
    Filed: October 27, 2004
    Publication date: September 8, 2005
    Inventors: Carl Dunlop, Stewart Hlohloza, Petrus Hoffmann, Cyril Knottenbelt, Leon Walliser