Patents by Inventor Carmen M. Lopez

Carmen M. Lopez 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).

  • Method for recharging a spend fluid catalytic cracking process catalyst
    Patent number: 5360774
    Abstract: A zeolitic material with a crystalline structure of MFI type has a ratio of silica to alumina which is lower than 26, and is hydrothermally prepared without organic template reagents or seeding procedures. Crystalline structure is obtained by forming a mixture of a silicon dioxide source, an alkali metal hydroxide, an aluminum source and water, all reactants with the following molar ratios: ##EQU1## where M is an alkali metal, and reacting the mixture at a temperature from 160.degree. to 180.degree. C. for 40-80 hours. The material is characterized by X-ray diffraction, and has good cracking activity and improved selectivity for gasoline octanes.
    Type: Grant
    Filed: August 9, 1993
    Date of Patent: November 1, 1994
    Assignee: Intevep, S.A.
    Inventors: Nelson P. Martinez, Juan A. Lujano, Nieves Alvarez, Francisco Machado, Carmen M. Lopez
  • Zeolitic catalyst of MFI type, its preparation and use
    Patent number: 5254327
    Abstract: A zeolitic material with a crystalline structure of MFI type has a ratio of silica to alumina which is lower than 26, and is hydrothermally prepared without organic template reagents or seeding procedures. Crystalline structure is obtained by forming a mixture of a silicon dioxide source, an alkali metal hydroxide, an aluminum source and water, all reactants with the following molar ratios: ##EQU1## where M is an alkali metal, and reacting the mixture at a temperature from 160.degree. to 180.degree. C. for 40-80 hours. The material is characterized by X-ray diffraction, and has good cracking activity and improved selectivity for gasoline octanes.
    Type: Grant
    Filed: April 3, 1992
    Date of Patent: October 19, 1993
    Assignee: Intevep, S.A.
    Inventors: Nelson P. Martinez, Juan A. Lujano, Nieves Alvarez, Francisco Machado, Carmen M. Lopez