Patents by Inventor Erdmann Hollborn

Erdmann Hollborn 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 tetrahydrofuran by distillation
    Patent number: 4912236
    Abstract: Crude water-containing tetrahydrofuran is purified by distillation by a process in which the crude tetrahydrofuran is passed through three distillation columns, water being removed from the bottom of the first column, water-containing tetrahydrofuran being recycled from the top of the second column into the first column, the top product of the third column being recycled to the first column, a distillate being removed at the top of the first column, and pure tetrahydrofuran being distilled off from the bottom product of the second column, in the third column, and the pure tetrahydrofuran being removed from the side take-off of the third column.
    Type: Grant
    Filed: August 12, 1988
    Date of Patent: March 27, 1990
    Assignee: BASF Aktiengesellschaft
    Inventors: Christof Palm, Otto H. Huchler, Ulrich-Dieter Pessel, Erdmann Hollborn, Dieter Schmitt