Patents by Inventor Nathalie Laurain

Nathalie Laurain 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).

  • Use of nitriles as polar aprotic solvents
    Publication number: 20040024238
    Abstract: The invention concerns the use of aliphatic nitriles with relatively high molecular weight, as polar aprotic solvents, in particular in nucleophilic substitution reactions of the aromatic type. Said nitriles have a molecular mass more 79, preferably more than 90. The invention is useful for synthesis of fluorinated aromatic compounds.
    Type: Application
    Filed: August 20, 2003
    Publication date: February 5, 2004
    Inventors: Nathalie Laurain, Samir Zard
  • Method for preparing lactam
    Patent number: 6262259
    Abstract: The present invention includes a process for the preparation of a lactam by vapor phase reaction of an aliphatic aminonitrile with water in the presence of a solid catalyst, wherein the catalyst is an alumina having a specific surface, measured by the BET method, greater than or equal to 10 m2/g. The alumina catalyst is further characterized by either: (a) a specific surface less than or equal to 280 m2/g, and a volume of pores with a diameter greater than 500 Å which is greater than or equal to 10 ml/100 g; or (b) a specific surface greater than or equal to 50 m2/g and less than or equal to 280 m2/g, and a volume of pores with a diameter greater than 70 Å which is greater than or equal to 30 m2/g.
    Type: Grant
    Filed: October 28, 1999
    Date of Patent: July 17, 2001
    Assignee: Rhoneapoulenc Fiber & Resin Intermediates
    Inventors: Marie-Christine Cotting, Laurent Gilbert, Nathalie Laurain, Christophe Nedez
  • Catalyst for the hydrogenation of nitriles to amines, preparation process thereof and hydrogenation process making use thereof
    Patent number: 5840989
    Abstract: The invention relates to a method of doping a Raney nickel catalyst doped with metals by the incorporation of the doping metals in the form of a complex into the alkaline attack medium. Also disclosed is a process for the hydrogenation of nitriles to amines using said catalyst.
    Type: Grant
    Filed: September 24, 1996
    Date of Patent: November 24, 1998
    Assignee: Rhone-Poulenc Chimie
    Inventors: Georges Cordier, Pierre Fouilloux, Nathalie Laurain
  • Process for the catalytic hydrogenation of nitriles to amines in the presence of a catalyst of doped raney nickel type
    Patent number: 5777166
    Abstract: The present invention relates to the field of the catalytic reduction of nitriles to amines by use of Raney catalysts doped with one or a number of additional metal elements chosen from the elements of group IVb of the periodic classification.More precisely, it relates to a process for the hydrogenation of nitriles to amines, characterized in that it essentially consists:in selecting a liquid reaction medium which dissolves the nitrile substrate to be hydrogenated,in using at least one inorganic alkali metal or alkaline-earth metal hydroxide base,and in adopting a catalyst whose doping element/Ni ratio by weight is between 0.05 and 10%.More specific application to the hydrogenation of dinitriles to diamines or to aminonitriles.
    Type: Grant
    Filed: November 25, 1996
    Date of Patent: July 7, 1998
    Assignee: Rhone-Poulenc Chimie
    Inventors: Georges Cordier, Pierre Fouilloux, Nathalie Laurain, Jean-Francis Spindler
  • Process for the preparation of lactams
    Patent number: 5723603
    Abstract: The present invention relates to a process for the preparation of lactams from dinitriles.It consists more precisely of a process for the preparation of lactam, linking two stages in series, one of hemihydrogenation of dinitrile to aminonitrile, the other of cyclizing hydrolysis of the aminonitrile after only one simple purification operation.Aliphatic lactams, such as especially epsilon-caprolactam, are base compounds for the preparation of polyamides (polyamide 6 from caprolactam).
    Type: Grant
    Filed: June 17, 1996
    Date of Patent: March 3, 1998
    Assignee: R.P. Fiber & Resin Intermediates
    Inventors: Laurent Gilbert, Nathalie Laurain, Philippe Leconte, Christophe Nedez