Patents by Inventor Nien-hwa L Wang

Nien-hwa L Wang 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).

  • Patent number: 10894870
    Abstract: Methods of recovery of pristine polymers and hydrocarbon mixtures from a sorted waste feedstock or mixtures of waste feedstock, which are with or without organic additives are disclosed. The methods include Sequential Selective Extraction and Adsorption (SSEA), Hydrothermal Processing (HTP), and a combination of SSEA and HTP. Exemplarily, SSEA includes selecting a first solvent (S1), inputting the S1 and a sorted feedstock free of organic additives into an extractor, heating, waiting, and separating insolubles forming a pristine polymer solution. Exemplarily, HTP includes inputting a hydrothermal solvent and a sorted feedstock free of organic additives into a reactor, heating to form subcritical or supercritical H2O, waiting, causing thermal depolymerization to produce a slurry, cooling, venting formed gases and separating the hydrocarbon mixture.
    Type: Grant
    Filed: April 19, 2019
    Date of Patent: January 19, 2021
    Assignee: Purdue Research Foundation
    Inventors: Wan-Ting Chen, Nien-hwa L Wang, Kai Jin
  • Publication number: 20190322832
    Abstract: Methods of recovery of pristine polymers and hydrocarbon mixtures from a sorted waste feedstock or mixtures of waste feedstock, which are with or without organic additives are disclosed. The methods include Sequential Selective Extraction and Adsorption (SSEA), Hydrothermal Processing (HTP), and a combination of SSEA and HTP. Exemplarily, SSEA includes selecting a first solvent (S1), inputting the S1 and a sorted feedstock free of organic additives into an extractor, heating, waiting, and separating insolubles forming a pristine polymer solution. Exemplarily, HTP includes inputting a hydrothermal solvent and a sorted feedstock free of organic additives into a reactor, heating to form subcritical or supercritical H2O, waiting, causing thermal depolymerization to produce a slurry, cooling, venting formed gases and separating the hydrocarbon mixture.
    Type: Application
    Filed: April 19, 2019
    Publication date: October 24, 2019
    Applicant: Purdue Research Foundation
    Inventors: Wan-Ting Chen, Nien-hwa L Wang, Kai Jin