Patents by Inventor Holger Mohn

Holger Mohn 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 a particularly pure glycolic acid
    Patent number: 5723662
    Abstract: The present invention relates to a process for preparing a particularly pure glycolic acid by saponification with chloroacetic acid with an excess of alkali metal hydroxide, with the resulting alkali metal chloride being filtered off, and the 20 to 70% strength by weight glycolic acid solution being subsequently subjected to an electrodialysis at 20.degree. to 40.degree. C. and a cell voltage of 0.5 to 2.5 V per cell pair. The process of the invention permits optimum removal of sodium chloride and chloroacetic acid as necessary for preparing a particularly pure glycolic acid. Other organic acids, nitrogen compounds, aldehydes and salts are not produced in this process and thus do not affect the product quality.
    Type: Grant
    Filed: January 9, 1997
    Date of Patent: March 3, 1998
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Frank Ebmeyer, Harald Haberlein, deceased, by Hans Harald Haberlein, heir, by Jorg Thomas Haberlein, heir, by Mark Christian Haberlein, heir, Holger Mohn