Patents by Inventor Hubert Puhl

Hubert Puhl 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).

  • Method for separating a C4-hydrocarbon mixture
    Patent number: 6337429
    Abstract: A C4-hydrocarbon mixture essentially containing 1,3-butadiene, butenes, butanes and other C4-hydrocarbons is separated into at least 4 fractions, a) the fraction (a) essentially comprising 1,3-butadiene, b) the fraction (b) essentially comprising butenes, c) the fraction (c) essentially comprising butanes and d) one or more fractions (d) essentially comprising 1,3-butadiene and the other C4-hydrocarbons, by extractive distillation by means of N-methyl-2-pyrrolidinone or an aqueous solution of N-methyl-2-pyrrolidinone (NMP).
    Type: Grant
    Filed: October 27, 2000
    Date of Patent: January 8, 2002
    Assignee: BASF Aktiengesellschaft
    Inventors: Klaus Kindler, Hubert Puhl