Patents by Inventor Norbert Richard

Norbert Richard 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 continuous manufacturing of dialkylaminoalkyl (METH) acrylates having a critical order of steps
    Patent number: 6437173
    Abstract: The present invention relates to the manufacture of a dialkylaminoalkyl (meth)acrylate by transesterification of methyl or ethyl (meth)acrylate with an amino alcohol. The transesterification catalyst is chosen from tetrabutyl, tetraethyl and tetra(2-ethylhexyl) titanates. The reaction is carried out in a stirred reactor at 90-120° C., after which the crude reaction mixture is sent to a tailing column (C1), the flow from the top of this column is sent to a topping column (C2) and the flow from the bottom of this column si then sent to a final rectification column (C3). A dialkylaminoalkyl (meth)acrylate of high purity is obtained in this way.
    Type: Grant
    Filed: April 21, 1999
    Date of Patent: August 20, 2002
    Assignee: Elf Atochem S.A.
    Inventors: Patrice Hurtel, Charles Hazan, Norbert Richard
  • Process for recovery of the light noble products present in the distillation residues from the processes for the manufacture of acrylic acid and of its esters
    Patent number: 5734075
    Abstract: To recover these noble products consisting of acrylic acid monomer, acrylic ester monomers and alcohols, a thermal cracking is performed in the absence of catalyst on a mixture of heavy distillation residues originating, on the one hand, from the manufacture of acrylic acid and, on the other hand, from the manufacture of the esters, the light fraction originating from the dissociation reactions is continuously vaporized during the cracking operation and this light fraction is distilled in order to recover, after condensation, the required products.
    Type: Grant
    Filed: December 12, 1995
    Date of Patent: March 31, 1998
    Assignee: Elf Atochem S.A.
    Inventors: Michel Fauconet, Norbert Richard, Patrick Delafin
  • Process for the production of alkyl (meth)acrylates by direct esterification
    Patent number: 5510514
    Abstract: An alkyl (meth)acrylate is prepared by a direct esterification (in 1) of (meth)acrylic acid by the corresponding alcohol, catalysed by H.sub.2 SO.sub.4. To the crude reaction mixture (C.sub.1) comprising the desired ester, alcohol, (meth)acrylic acid, alkyl hydrogen sulphate and traces of H.sub.2 SO.sub.4, there is added (in 3) a base to neutralize the acidic species, the resulting salts passing into the aqueous phase (A.sub.1), which is separated from the organic phase (O.sub.1) containing the desired ester. The light products (L.sub.1) containing the alcohol are recovered (in 4) from the aqueous phase, and the waste waters (W.sub.2) are expelled. A hydrolysis is carried out (in 8) of the alkyl hydrogen sulphate present in the aqueous phase (A.sub.1) obtained after the separation which is carried out after neutralization (in 3), to form the alcohol and H.sub.2 SO.sub.4 in this phase, the acidic species resulting from the hydrolysis are neutralized by introduction of a base .
    Type: Grant
    Filed: January 27, 1994
    Date of Patent: April 23, 1996
    Assignee: Elf Atochem S.A.
    Inventors: Michel Fauconet, Norbert Richard, Marc Esch, Nadine Colin