Patents by Inventor Frank K. Schweighardt

Frank K. Schweighardt 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 solvent refining of coal using a denitrogenated and dephenolated solvent
    Patent number: 4472263
    Abstract: A process is disclosed for the solvent refining of non-anthracitic coal at elevated temperatures and pressure in a hydrogen atmosphere using a hydrocarbon solvent which before being recycled in the solvent refining process is subjected to chemical treatment to extract substantially all nitrogenous and phenolic constituents from the solvent so as to improve the conversion of coal and the production of oil in the solvent refining process. The solvent refining process can be either thermal or catalytic. The extraction of nitrogenous compounds can be performed by acid contact such as hydrogen chloride or fluoride treatment, while phenolic extraction can be performed by caustic contact or contact with a mixture of silica and alumina.
    Type: Grant
    Filed: July 19, 1982
    Date of Patent: September 18, 1984
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Diwakar Garg, Edwin N. Givens, Frank K. Schweighardt