Patents by Inventor Andre Duex

Andre Duex 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 PREPARING DIALKYL CARBONATES FROM ALKYLENE CARBONATES AND ALCOHOLS
    Publication number: 20110040117
    Abstract: The present invention relates to a continuous process for preparing lower dialkyl carbonates as main product and alkylene glycol as by-product by catalyzed transesterification of a cyclic alkylene carbonate (e.g. ethylene carbonate or propylene carbonate) with lower alcohols, where the reaction of the alkylene carbonate is carried out with an alcohol containing dialkyl carbonate in countercurrent, characterized in that introduction of a stream containing at least 99.5% by weight of alcohol takes place below the point of introduction for the alcohol containing dialkyl carbonate in a particular spacing ratio between the abovementioned points of introduction.
    Type: Application
    Filed: June 25, 2010
    Publication date: February 17, 2011
    Applicant: Bayer MaterialScience AG
    Inventors: Friedhelm Risse, Pieter Ooms, Andre Duex, Marcus Grünewald, Thomas Pancur, Arthur Susanto, Georg Ronge, Johan Vanden Eynde, Wim Wuytack