Patents Assigned to Mallinckrodt Specialty Chemicals Co., Inc.
  • Process for preparing aromatic fluorides
    Patent number: 5107046
    Abstract: An improved process is disclosed for preparing aromatic fluorides by diazotization-fluorination in hydrogen fluoride. The improvement includes, prior to the decomposition of the diazonium fluoride, adding to the diazotizing reaction mixture, urea or a salt thereof in an amount sufficient to reduce the vapor pressure of hydrogen fluoride over the diazonium solution. Also disclosed is a process for reducing the vapor pressure over diazonium fluoride solutions.
    Type: Grant
    Filed: May 23, 1990
    Date of Patent: April 21, 1992
    Assignee: Mallinckrodt Specialty Chemicals Co., Inc.
    Inventor: Gary L. Cantrell