Patents by Inventor Alain Maurel

Alain Maurel 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).

  • Polymerization catalyst
    Patent number: 6887954
    Abstract: The present invention is a process and an apparatus for the gas phase polymerization of olefin(s) using a fluidised-bed reactor (1) from which, at the top part, is withdrawn a recycling gas stream which comprises unreacted gas and entrained solid particles and which is moved by virtue of a compressor (4), which is cooled by passing into a heat exchanger (7) and which is reintroduced into the reactor at the bottom part (1a) of the latter. The heat exchanger (7) is a multitubular exchanger successively comprising an inlet chamber (6), a bundle of tubes (9) with a horizontal longitudinal axis and an outlet chamber (10) equipped with a discharge orifice (11).
    Type: Grant
    Filed: October 11, 2001
    Date of Patent: May 3, 2005
    Assignee: BP Chemicals Limited
    Inventor: Jean-Alain Maurel
  • Polymerisation catalyst
    Publication number: 20020048537
    Abstract: The present invention is a process and an apparatus for the gas phase polymerization of olefin(s) using a fluidised-bed reactor (1) from which, at the top part, is withdrawn a recycling gas stream which comprises unreacted gas and entrained solid particles and which is moved by virtue of a compressor (4), which is cooled by passing into a heat exchanger (7) and which is reintroduced into the reactor at the bottom part (1a) of the latter. The heat exchanger (7) is a multitubular exchanger successively comprising an inlet chamber (6), a bundle of tubes (9) with a horizontal longitudinal axis and an outlet chamber (10) equipped with a discharge orifice (11).
    Type: Application
    Filed: October 11, 2001
    Publication date: April 25, 2002
    Inventor: Jean-Alain Maurel
  • Process for separating sodium from aqueous effluents resulting from the reprocessing of spent nuclear fuel elements
    Patent number: 5925254
    Abstract: The invention relates to a process for separating sodium from aqueous effluents resulting from the reprocessing of spent nuclear fuel elements. According to the invention, the effluent (3) is introduced into a tangential filtration module (11), whose membranes are made from polyaramide, sulphonated polysulphone or perfluorinated ionomer, so as to collect a permeate P containing sodium, depleted in radioactive elements and a retentate R enriched in radioactive elements.
    Type: Grant
    Filed: March 8, 1996
    Date of Patent: July 20, 1999
    Assignees: Commissariat A l'Energie Atomique, Compagnie Generale des Matieres Nucleaires
    Inventors: Marc Lemaire, Jacques Foos, Alain Guy, Eric Gaubert, Colette Bardot, Rodolph Chomel, Jean-Jacques Radecky, Alain Maurel, Henri Barnier