Patents by Inventor Nieves Alvarez

Nieves Alvarez 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).

  • Process for catalytic cracking of a hydrocarbon feed with a MFI aluminisilcate composition
    Patent number: 6726834
    Abstract: A process for catalytic cracking of a hydrocarbon feed, includes the steps of providing an initial hydrocarbon fraction; providing a catalyst comprising an aluminosilicate composition having an aluminosilicate composition having an aluminosilicate framework and containing at least one metal other than aluminum incorporated into the aluminosilicate framework; and exposing the hydrocarbon to the catalyst under catalytic cracking conditions so as to provide an upgraded hydrocarbon product.
    Type: Grant
    Filed: March 28, 2001
    Date of Patent: April 27, 2004
    Assignee: Intevep, S.A.
    Inventors: Andrés M. Quesada, Gerardo Vitale-Rojas, José Velásquez, María Nieves Alvarez
  • Aluminosilicate compositions, preparation and use
    Publication number: 20020056662
    Abstract: A process for catalytic cracking of a hydrocarbon feed, includes the steps of providing an initial hydrocarbon fraction; providing a catalyst comprising an aluminosilicate composition having an aluminosilicate composition having an aluminosilicate framework and containing at least one metal other than aluminum incorporated into the aluminosilicate framework; and exposing the hydrocarbon to the catalyst under catalytic cracking conditions so as to provide an upgraded hydrocarbon product.
    Type: Application
    Filed: March 28, 2001
    Publication date: May 16, 2002
    Inventors: Andres M. Quesada, Gerardo Vitale-Rojas, Jose Velasquez, Maria Nieves Alvarez
  • Antimony and tin containing compound, use of such a compound as a passivating agent, and process for preparing such a compound
    Patent number: 5401384
    Abstract: An antimony and tin containing compound for passivating contaminant metals to which a catalyst is exposed during fluid catalytic cracking of hydrocarbons containing said contaminant metals, said compound having a composition as follows (R*).sub.x Sb(OSn(R**).sub.3).sub.n wherein R* and R** are aryl compounds having between 6 to 13 carbon atoms, wherein n=1, 2 or 3 and x=4 when n=1, x=3 when n=2, and x=0 when n=3.
    Type: Grant
    Filed: December 17, 1993
    Date of Patent: March 28, 1995
    Assignees: Inteven, S.A., Universidad Simon Bolivar
    Inventors: Nelson Martinez, Juan Lujano, Nieves Alvarez, Jacek Lubinkowski, William McEwen
  • 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