Patents by Inventor Xavier Rondeau

Xavier Rondeau 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 producing a fertilizer containing urea and ammonium sulphate
    Patent number: 7837758
    Abstract: Method for the production of solid urea ammonium sulphate (UAS) fertilizers from sulphuric acid, ammonia and urea, wherein free ammonia and/or as carbamate to be decomposed from urea production, is reacted with sulphuric acid without substantially decomposing urea in the process stream, where after urea and ammonium sulphate (AS) is mixed and particulated. The point of integration of the ammonium sulphate production in the urea production process is chosen according to the desired product composition. The reaction is carried out in a pipe reactor where the head of the reactor enhanced the chemical reaction between sulphuric acid and ammonia and the urea solution surrounds the ammonium sulphate formation.
    Type: Grant
    Filed: June 30, 2005
    Date of Patent: November 23, 2010
    Assignee: Yara International ASA
    Inventors: Rune Ingels, Xavier Rondeau, Francois Ledoux
  • Method for Producing a Fertilizer Containing Urea and Ammonium Sulphate
    Publication number: 20080092614
    Abstract: Method for the production of solid urea ammonium sulphate (UAS) fertilizers from sulphuric acid, ammonia and urea, wherein free ammonia and/or as carbamate to be decomposed from urea production, is reacted with sulphuric acid without substantially decomposing urea in the process stream, where after urea and ammonium sulphate (AS) is mixed and particulated. The point of integration of the ammonium sulphate production in the urea production process is chosen according to the desired product composition. The reaction is carried out in a pipe reactor where the head of the reactor enhanced the chemical reaction between sulphuric acid and ammonia and the urea solution surrounds the ammonium sulphate formation.
    Type: Application
    Filed: June 30, 2005
    Publication date: April 24, 2008
    Inventors: Rune Ingels, Xavier Rondeau, Francois Ledoux