Patents Assigned to Kramer Aktiengesellschaft
  • Sulphonation products of naphthalene, processes for their preparation, and their use
    Patent number: 4600542
    Abstract: The invention concerns new sulfonation products of naphthalene, process for their preparation according to which naphthalene is sulfonated under special reaction conditions by sulfur trioxide in inert organic solvents. The new sulfonation products are used as intermediates e.g. for the production of naphthalene-1,5-disulfonic acid.
    Type: Grant
    Filed: February 9, 1981
    Date of Patent: July 15, 1986
    Assignee: Kramer Aktiengesellschaft
    Inventors: Otto Lindner, Heinrich Pelster, Guido Steffan, Arnd Stuwe