Patents by Inventor Leonard Singleton, Jr.

Leonard Singleton, 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).

  • Process for polymerization of polyvinyl chloride and VCM monomer removal
    Patent number: 4200734
    Abstract: The present invention relates to an improvement in a process for polymerization of polyvinyl chloride, particularly in a suspension polymerization process which provides for removal of residual vinyl chloride monomer, such as by employing a step in which the PVC suspension resin slurry is passed through a column in which it is subjected to a combination of stream and pressure/vacuum conditions. In the improved process of the present invention, the PVC suspension resin slurry feed to the stripping column is first passed through the cold feed side of a spiral hat exchanger, and the PVC suspension slurry outflow from the stripping column is passed through the hot feed side of the heat exchanger, whereby the feed stream to the stripping column acts as a cooling medium for the outlet stream from the stripping column, and the outlet stream from the stripping column serves as a preheating medium for the feed stream.
    Type: Grant
    Filed: November 21, 1977
    Date of Patent: April 29, 1980
    Assignee: Diamond Shamrock Corporation
    Inventors: Dale R. Muehlenbrock, John R. Prihoda, Leonard Singleton, Jr.