Patents by Inventor Rich John Stolz

Rich John Stolz 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).

  • Closed reactor transitions between metallocene catalysts
    Patent number: 10221254
    Abstract: A method for transitioning a gas phase polymerization reactor between metallocene catalysts is provided. The method comprises first reducing the superficial gas velocity and increasing the height of the fluidized bed within the reactor prior to stopping a feed comprising a first metallocene catalyst. The method further comprises introducing a first polymerization neutralizer to the reactor, wherein the first polymerization reactor does not comprise water, and then introducing a second polymerization neutralizer to the reactor, wherein the second polymerization neutralizer is different from the first polymerization neutralizer. After this, the method comprises purging the reactor with an inert gas and then introducing a feed comprising a second metallocene catalyst to the reactor.
    Type: Grant
    Filed: April 6, 2016
    Date of Patent: March 5, 2019
    Assignee: Univation Technologies, LLC
    Inventors: Brandon C. Locklear, R. Eric Pequeno, Richard B. Pannell, Fathi David Hussein, Rich John Stolz, William A. Matthews
  • CLOSED REACTOR TRANSITIONS BETWEEN METALLOCENE CATALYSTS
    Publication number: 20180079836
    Abstract: A method for transitioning a gas phase polymerization reactor between metallocene catalysts is provided. The method comprises first reducing the superficial gas velocity and increasing the height of the fluidized bed within the reactor prior to stopping a feed comprising a first metallocene catalyst. The method further comprises introducing a first polymerization neutralizer to the reactor, wherein the first polymerization reactor does not comprise water, and then introducing a second polymerization neutralizer to the reactor, wherein the second polymerization neutralizer is different from the first polymerization neutralizer. After this, the method comprises purging the reactor with an inert gas and then introducing a feed comprising a second metallocene catalyst to the reactor.
    Type: Application
    Filed: April 6, 2016
    Publication date: March 22, 2018
    Applicant: Univation Technologies, LLC
    Inventors: Brandon C. Locklear, R. Eric Pequeno, Richard B. Pannell, Fathi David Hussein, Rich John Stolz, William A. Matthews
  • Method for reducing off-grade product production during reaction transitions
    Patent number: 7343225
    Abstract: In some embodiments, a method for determining initial conditions for a transition from an initial reaction to a target reaction to minimize (or substantially minimize) the amount of off-grade material produced during the transition, and optionally also process control variables for implementing the transition. Some embodiments also include the steps of setting the reaction conditions to determined initial conditions and then implementing the transition.
    Type: Grant
    Filed: June 3, 2005
    Date of Patent: March 11, 2008
    Assignee: Univation Technologies, LLC
    Inventors: Ivan J. Hartley, John R. Parrish, Rich John Stolz