Patents by Inventor Paulo C. W. De Albuquerque

Paulo C. W. De Albuquerque 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 phosphated or nitrophosphated fertilizers through solubilization of phosphate rock
    Patent number: 5211735
    Abstract: The invention aims at a process for preparing phosphated or nitrophosphated fertilizers through reaction of phosphate rock in aqueous pulp, with sulfuric and/or phosphoric acids, with addition, or not, of ammonia, so as to produce fertilizers of the types simple, double or triple superphosphates, nitrogen-bearing (or not) phosphated partially acidulated, and superphosphated ammoniated, the product being adequate for use as a fertilizer, either powdered or slurried.The invention allows for a more complete reaction due to the better contact between the liquid and solid reagents besides the complete utilization of the heat produced in the reaction as well as in the acid dilution in the aqueous medium, for the vaporization of the water present in the process.
    Type: Grant
    Filed: August 15, 1991
    Date of Patent: May 18, 1993
    Assignee: Petroleo Brasileiro S. A.
    Inventors: Fabio G. M. Costa, Alberto C. C. Da Silva, Paulo C. W. De Albuquerque, Alberto Laranjeira