Patents by Inventor Raphaël DOUDIN

Raphaël DOUDIN 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 filtering 2-acrylamido-2-methylpropane sulfonic acid
    Patent number: 12145900
    Abstract: A continuous process for filtering a suspension of 2-acrylamido-2-methylpropane sulfonic acid crystals by means of a rotary pressure filter equipped with a drum, a surface of which is provided with cells covered with a filter medium, the drum rotating within a fixed concentric cylinder comprising at least three zones sealed from each other, respectively a filtration zone, a washing zone and a discharge zone, each zone opening onto the cells.
    Type: Grant
    Filed: May 7, 2020
    Date of Patent: November 19, 2024
    Inventors: Cédrick Favero, Raphaël Doudin, Johann Kieffer, Benoît Legras
  • Method for the purification of acrylamido-2-methyl-2-propanesulphonic acid
    Patent number: 11802109
    Abstract: The invention relates to a method for the purification of acrylamido-2-methyl-2-propanesulphonic acid comprising the following successive steps: 1) preparation of a suspension of acrylamido-2-methyl-2-propanesulphonic acid crystals by distillation of an aqueous solution of acrylamido-2-methyl-2-propanesulphonic acid in order to obtain a suspension of acrylamido-2-methyl-2-propanesulphonic acid crystals, 2) isolation of the acrylamido-2-methyl-2-propanesulphonic acid crystals generally by solid/liquid separation from said suspension in order to isolate said acrylamido-2-methyl-2-propanesulphonic acid crystals, characterised in that the distillation step is carried out continuously and at a pressure below atmospheric pressure.
    Type: Grant
    Filed: September 15, 2021
    Date of Patent: October 31, 2023
    Assignee: SNF GROUP
    Inventors: Cédrick Favero, Johann Kieffer, Benoît Legras, Raphaël Doudin
  • NOVEL PROCESS FOR FILTERING 2-ACRYLAMIDO-2-METHYLPROPANE SULFONIC ACID
    Publication number: 20220227704
    Abstract: A continuous process for filtering a suspension of 2-acrylamido-2-methylpropane sulfonic acid crystals by means of a rotary pressure filter equipped with a drum, a surface of which is provided with cells covered with a filter medium, the drum rotating within a fixed concentric cylinder comprising at least three zones sealed from each other, respectively a filtration zone, a washing zone and a discharge zone, each zone opening onto the cells.
    Type: Application
    Filed: May 7, 2020
    Publication date: July 21, 2022
    Inventors: Cédrick Favero, Raphaël Doudin, Johann Kieffer, Benoît Legras
  • METHOD FOR THE PURIFICATION OF ACRYLAMIDO-2-METHYL-2-PROPANESULPHONIC ACID
    Publication number: 20220089530
    Abstract: The invention relates to a method for the purification of acrylamido-2-methyl-2-propanesulphonic acid comprising the following successive steps: 1) preparation of a suspension of acrylamido-2-methyl-2-propanesulphonic acid crystals by distillation of an aqueous solution of acrylamido-2-methyl-2-propanesulphonic acid in order to obtain a suspension of acrylamido-2-methyl-2-propanesulphonic acid crystals, 2) isolation of the acrylamido-2-methyl-2-propanesulphonic acid crystals generally by solid/liquid separation from said suspension in order to isolate said acrylamido-2-methyl-2-propanesulphonic acid crystals, characterised in that the distillation step is carried out continuously and at a pressure below atmospheric pressure.
    Type: Application
    Filed: September 15, 2021
    Publication date: March 24, 2022
    Applicant: SPCM SA
    Inventors: Cédrick FAVERO, Johann KIEFFER, Benoît LEGRAS, Raphaël DOUDIN