Patents by Inventor Roxana Vega-Rangel

Roxana Vega-Rangel 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).

  • Chemical process for recycling polyethylene terephthalate (PET) waste
    Patent number: 7893122
    Abstract: The present invention relates to a process for chemical recycling of PET waste that comprises, among other stages, a saponification reaction stage, wherein PET waste particles are reacted with stoichiometric or excessive amounts of a strong base metal in an alcoholic reaction media, the reaction being brought to the boiling temperature of the alcoholic reaction media, preferably at atmospheric pressure, thereby obtaining as reaction products a salt of terephthalic acid with the base metal and ethylene glycol, the latter being incorporated to the alcoholic reaction media. From this reaction it is possible to afford ethylene glycol, terephthalic acid and salts thereof, which are products with a high commercial value.
    Type: Grant
    Filed: January 27, 2004
    Date of Patent: February 22, 2011
    Inventors: Arturo Guadalupe Fregoso-Infante, Roxana Vega-Rangel, Maricruz Figueroa-Gomez-Crespo
  • Chemical Process For Recycling Polyethylene Terephtalate (Pet) Waste
    Publication number: 20070219339
    Abstract: The present invention relates to a process for chemical recycling of PET waste that comprises, among other stages, a saponification reaction stage, wherein PET waste particles are reacted with stoichiometric or excessive amounts of a strong base metal in an alcoholic reaction media, the reaction being brought to the boiling temperature of the alcoholic reaction media, preferably at atmospheric pressure, thereby obtaining as reaction products a salt of terephthalic acid with the base metal and ethylene glycol, the latter being incorporated to the alcoholic reaction media. From this reaction it is possible to afford ethylene glycol, terephthalic acid and salts thereof, which are products with a high commercial value.
    Type: Application
    Filed: January 1, 2004
    Publication date: September 20, 2007
    Inventors: Auturo Fregoso-Infante, Roxana Vega-Rangel, Maricruz Figueroa-Gomez-Crespo