Patents by Inventor William Pleasant Nelson

William Pleasant Nelson 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).

  • Use of paired reboilers in the purification of propylene oxide by extractive distillation
    Patent number: 5772854
    Abstract: In the purification of an aqueous acetone-contaminated propylene oxide feedstock in an extractive distillation column in the presence of an oxyalkylene glycol extractive distillation agent under distillation conditions selected to promote the formation and maintenance of an acetone buffer in the distillation column, a higher boiling (heavier) distillation fraction containing substantially all of the oxyalkylene glycols, water, and acetone introduced into the extractive distillation column is continuously withdrawn and the higher boiling (heavier) distillation fraction is partially vaporized in a first reboiler; the remaining liquid being partially vaporized in a second reboiler and the vapors being recycled to the extractive distillation column.
    Type: Grant
    Filed: August 17, 1995
    Date of Patent: June 30, 1998
    Assignee: Huntsman Specialty Chemicals Corporation
    Inventors: William Pleasant Nelson, Mark Elliott Taylor