Patents by Inventor Ulrich Roesnik

Ulrich Roesnik 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).

  • Purification of 1,2-dichloroethane recovered in the incomplete thermal cracking to vinyl chloride
    Patent number: 4257850
    Abstract: The invention relates to a process for purifying 1,2-dichloroethane which is recovered during incomplete thermal cracking to vinyl chloride and contains contaminants boiling at a temperature lower than 83.7.degree. C. under a pressure of 1011 millibars, briefly termed low boilers, and contaminants boiling at a temperature higher than 83.7.degree. C. under a pressure of 1011 millibars, briefly termed high boilers. More particularly, low boilers are distilled off overhead from contaminated 1,2-dichloroethane, in a first distilling zone; a portion of low boiler concentrate is continuously treated at 30.degree. to 85.degree. C.
    Type: Grant
    Filed: January 25, 1980
    Date of Patent: March 24, 1981
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Gerhard Rechmeier, Ulrich Roesnik, Harald Scholz