Patents by Inventor Rolf Schafer

Rolf Schafer 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 producing sodium chloride brines suitable for electrolysis
    Patent number: 4046865
    Abstract: Contacting rock salt containing at least one member of the group consisting of anhydrite and calcium sulfate as an impurity with an aqueous sodium chloride solution initially containing from about 200 to about 300 g/l of sodium chloride and having a calcium ion concentration of 0.01 to 0.5 g/l and a sulfate ion concentration of 0.1 to 15 g/l, the multiplication product of said calcium ion concentration and said sulfate ion concentration having a maximum value of 2, and discontinuing said contact after the sodium chloride brine has formed.
    Type: Grant
    Filed: November 22, 1976
    Date of Patent: September 6, 1977
    Assignee: Bayer Aktiengesellschaft
    Inventor: Rolf Schafer
  • Selective absorption of chloride from gases which contain chlorine and carbon dioxide
    Patent number: 3984523
    Abstract: In a process for the dechlorination of gas mixtures containing carbon dioxide and chlorine, wherein in several absorption stages the chlorine is converted with stoichiometric alkali metal hydroxide solution into a carbonate-free alkali metal chloride-alkali metal hypochlorite solution and wherein the required stoichiometric amount of alkali metal hydroxide is introduced countercurrent to the gas stream via the last absorption stage, the improvement which comprises operating the last absorption stage in such a manner that due to free alkali metal hydroxide no alkali metal hydrogen-carbonate is present in said stage.
    Type: Grant
    Filed: June 17, 1974
    Date of Patent: October 5, 1976
    Assignee: Bayer Aktiengesellschaft
    Inventors: Rolf Schafer, Hans Schifferdecker