Patents by Inventor Webb B. Blackman, Jr.

Webb B. Blackman, Jr. 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).

  • Recovery of caprolactam from nylon 6 oligomers
    Patent number: 4311642
    Abstract: This invention is the method to recover caprolactam from a concentrated nylon 6 chip wash water containing water, cyclic oligomer, and caprolactam. The method comprises feeding the concentrated wash water to a wiped-film evaporator operated at a temperature of from about 200.degree. C. to 300.degree. C. and a pressure from about 10 to about 250 Torr, thereby separating the wash water into (a) an overhead stream of water and caprolactam and (b) a bottom stream of caprolactam and cyclic oligomers, then recovering the caprolactam from the overhead stream. The caprolactam in the bottom stream can also be recovered, and the cyclic oligomers depolymerized to caprolactam for recovery.
    Type: Grant
    Filed: September 17, 1980
    Date of Patent: January 19, 1982
    Assignee: Allied Corporation
    Inventors: Lamberto Crescentini, Webb B. Blackman, Jr., Joseph D. DeCaprio, William B. Fisher, Roy J. Lilley, Jr., John W. Wagner