Patents by Inventor Dennis M. Nygaard

Dennis M. Nygaard 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).

  • Production of diethanolamine
    Patent number: 6063965
    Abstract: This invention concerns a process for preparation of alkanolamines such as diethanolamine (DEA) from ammonia and an alkylene oxide such as ethylene oxide. The yield of DEA may be increased by adding monoethanolamine (MEA) to the second feed in a split feed reactor scheme. The process can be conducted as a multistep process, such as by reacting a portion of the ethylene oxide followed by addition of a second charge of ethylene oxide after complete reaction of the first charge of ethylene oxide.
    Type: Grant
    Filed: September 8, 1998
    Date of Patent: May 16, 2000
    Assignee: Huntsman Petrochemical Corporation
    Inventors: Dennis M. Nygaard, Ralph M. Diguilio