Patents by Inventor Eric B. Henriet

Eric B. Henriet 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 purifying adipic acid by crystallization
    Patent number: 6538156
    Abstract: The invention discloses a method for purifying adipic acid by crystallization or recrystallization in at least one carbolyxic acid. More precisely, it discloses an improvement in adipic acid crystallization or recrystallization, characterised in that the said crystallization or recrystallization is effected in at least one carboxylic acid with a melting point below 20° C. The presence of carbon monoxide during crystallization or recrystallization can have a favourable effect on the adipic acid purity, in particular by reducing the content of metal catalyst traces of the adipic acid. The adipic acid purity can also be improved when the crystallization or recrystallization is effected in presence of a strong proton acid.
    Type: Grant
    Filed: December 4, 1998
    Date of Patent: March 25, 2003
    Assignee: Rhodia Fiber & Resin Intermediates
    Inventors: Eric B. Henriet, Philippe Leconte, Carl Patois, Robert Perron
  • Pentenoic acid hydroxycarbonylation method
    Patent number: 6372942
    Abstract: The invention discloses pentenoic acid hydroxycarbonylation into adipic acid. More particularly, it concerns one pentenoic acid hydroxycarbonylation method involving reaction water and carbon monoxide, in the presence of a catalyst comprising at least rhodium and/or iridium and an iodinated or brominated catalytic promoter. In the method, the catalyst is derived at least in part from a previous pentenoic acid hydroxycarbonylation operation. The reaction is effected in the presence of an amount of branched carboxylic diacids having 6 carbon atoms not exceeding 200 grams per kilogram reaction mixture.
    Type: Grant
    Filed: March 17, 1999
    Date of Patent: April 16, 2002
    Assignee: Rhodia Fiber & Resin Intermediates
    Inventors: Jacques Brivet, Eric B. Henriet, Carl Patois, Robert Perron
  • Method for purifying adipic acid in water
    Patent number: 6222069
    Abstract: The invention discloses a method for purifying adipic acid in water. More precisely it discloses an improvement in adipic acid crystallization or recrystallization in water, characterised in that the said crystallization or recrystallization is effected in presence of a strong proton acid and/or in the presence of carbon monoxide. This crystallization or recrystallization particularly enables the content of metal catalyst traces in the adipic acid to be reduced.
    Type: Grant
    Filed: March 17, 1999
    Date of Patent: April 24, 2001
    Assignee: Rhodia Fiber and Resin Intermediates
    Inventors: Eric B. Henriet, Philippe Leconte, Carl Patois, Robert Perron
  • Ester syntheses and transesterifiable xanthate reactants therefor
    Patent number: 5977395
    Abstract: "Esters" are synthesized by reacting a nucleophile with a propargyl xanthate advantageously having the formula (I):R.sub.3 --C.tbd.C--CR.sub.1 R.sub.2 --S--CS--Y--R (I)in the presence of at least one acid, Bronsted or otherwise, and at a temperature ranging from 0.degree. to 300.degree. C.; the subject reaction is particularly applicable to a wide variety of chiral organic syntheses.
    Type: Grant
    Filed: March 18, 1997
    Date of Patent: November 2, 1999
    Assignee: Rhone-Poulenc Chimie
    Inventors: Jean Boivin, Eric B. Henriet, Samir Z. Zard
  • Ester syntheses and transesterifiable xanthate reactants therefor
    Patent number: 5637722
    Abstract: "Esters" are synthesized by reacting a nucleophile with a propargyl xanthate advantageously having the formula (I):R.sub.3 --C.tbd.C--CR.sub.1 R.sub.2 --S--CS--Y--R (I)in the presence of at least one acid, Bronsted or otherwise, and at a temperature ranging from 0.degree. to 300.degree. C.; the subject reaction is particularly applicable to a wide variety of chiral organic syntheses.
    Type: Grant
    Filed: May 30, 1995
    Date of Patent: June 10, 1997
    Assignee: Rhone-Poulenc Chimie
    Inventors: Jean Boivin, Eric B. Henriet, Samir Z. Zard