Patents by Inventor Hernando Diaz-Arauzo

Hernando Diaz-Arauzo 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 of mitigating fouling and reducing viscosity in primary fractionators and quench sections of ethylene plants
    Patent number: 5985940
    Abstract: A method is disclosed for mitigating fouling and reducing viscosity in primary fractionators and quench sections of ethylene plants by adding to a hydrocarbon stream a mono and/or a polyalkyl-substituted phenol-formaldehyde resin having a weight average molecular weight of from about 1,000 to about 30,000 and at least one alkyl substituent containing from about 4 to about 24 carbon atoms, which alkyl substituent may be linear or branched.
    Type: Grant
    Filed: February 17, 1998
    Date of Patent: November 16, 1999
    Assignee: Nalco/Exxon Energy Chemicals, L.P.
    Inventors: Maria B. Manek, Chin Hai Chen, Roberto G. Presenti, Hernando Diaz-Arauzo
  • Oxyalkylated phenol/formaldehyde resin for desalter applications in the refinery Industry
    Patent number: 5525201
    Abstract: Certain base catalyzed oxyalkylated-cardanol-alkylphenol-aldehyde resins may be utilized in refinery demulsification operations. These materials find particular utility in breaking water-in-oil emulsions resulting from the water wash of crude oils. The materials may also be employed to break other water-in-oil refinery emulsions.
    Type: Grant
    Filed: February 22, 1994
    Date of Patent: June 11, 1996
    Assignee: Nalco Chemical Company
    Inventors: Hernando Diaz-Arauzo, Paul M. Lindemuth, Bryan T. O'Reilly
  • Phenolic resins and method for breaking crude oil emulsions
    Patent number: 5460750
    Abstract: A composition and method for breaking crude oil emulsions is disclosed. This composition is a branched, high-molecular weight condensation product of cardanol, an alkylphenol, and an aldehyde, which may be ethoxylated or otherwise derivatized using methods standard in the art. These compositions show good emulsion-breaking performance, especially when used in blends with other compositions.
    Type: Grant
    Filed: August 10, 1993
    Date of Patent: October 24, 1995
    Assignee: Nalco Chemical Company
    Inventor: Hernando Diaz-Arauzo