Patents by Inventor Renzo Penzo

Renzo Penzo 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 the extraction of the salts contained in the neutralized separated product obtained in the preparation of phenol by the oxidation of cumene
    Patent number: 6180834
    Abstract: Process for the extraction of the salts contained in the neutralized separated product obtained in the preparation of phenol by the oxidation of cumene, wherein the flow-rate of the aqueous stream of the separation section of cumene hydroperoxide is reduced by substituting the stream of fresh water used for washing the neutralized separated product, generally obtained by the demineralization of well or running water, with process water taken from another section of the production plant.
    Type: Grant
    Filed: April 8, 1999
    Date of Patent: January 30, 2001
    Assignee: Enichem S.p.A.
    Inventors: Vanni Alessi, Renzo Penzo
  • Process for the recovery of phenol from an aqueous stream containing NA.sub. SO.sub.4
    Patent number: 5811598
    Abstract: Phenol dissolved in an aqueous sulphatic stream discharged from a reactor in which cumene hydroperoxide is oxidized to phenol and acetone is recovered by extracting phenol present in said aqueous sulphatic stream containing phenol, Na.sub.2 SO.sub.4 and organic impurities, in a multi-step extractor with an organic solvent, thereby forming an extracted product organic phase and a refined aqueous product phase, the ratio of the extracted product phase to the refined product phase ranging from 0.1 to 1 v/v at a temperature ranging from 20.degree.-70.degree. C., and obtaining phenol by distillation or re-extraction of the recovered extracted product organic phase.
    Type: Grant
    Filed: December 4, 1995
    Date of Patent: September 22, 1998
    Assignee: Enichem S.p.A.
    Inventors: Vanni Alessi, Sabrina Astori, Francesco Celin, Cecilia Gradella, Renzo Penzo
  • Reduction of the COD of an aqueous stream containing hydroperoxides and other organic impurities
    Patent number: 5658437
    Abstract: A process for reducing the COD of an aqueous stream containing methylhydroperoxide, cumylhydroperoxide and other organic impurities characterized in that the reduction of COD is obtained by eliminating the peroxides from the aqueous stream by column distillation.
    Type: Grant
    Filed: December 22, 1995
    Date of Patent: August 19, 1997
    Assignee: Enichem S.p.A.
    Inventors: Vanni Alessi, Alessandro Franzoni, Vittorio Milanesi, Renzo Penzo
  • Process for recovering phenol from a rectification purge
    Patent number: 4973766
    Abstract: A process for recovering phenol from a rectification purge containing various organic foreign matters, which includes the steps of subjecting the purge to an extraction operation, using, as an extracting solvent, an aqueous solution of an alkali metal phenate.
    Type: Grant
    Filed: October 23, 1989
    Date of Patent: November 27, 1990
    Assignee: Montedipe S.r.l.
    Inventors: Renzo Penzo, Paolo Reggiani, Claudio Spaggiari