Patents by Inventor Lee Sangjoo

Lee Sangjoo 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).

  • METHOD OF MAKING TEREPHTHALIC ACID
    Publication number: 20230094935
    Abstract: Disclosed is a process for producing terephthalic acid. The process includes contacting p-xylene with a gaseous stream containing oxygen (O2) in presence of a homogeneous catalyst solution, at a reaction temperature of 180° C. to 195° C. to oxidize at least a portion of the p-xylene and form a product stream containing terephthalic acid, said homogeneous catalyst solution contains 350 ppm to 450 ppm cobalt (Co), 170 ppm to 270 ppm manganese (Mn), and 410 ppm to 510 ppm bromine (Br), wherein a Br/(Co+Mn) wt. % ratio is 0.5:1 to 1:1, and a Co to Mn wt. % ratio is 1.5:1 to 2:1.
    Type: Application
    Filed: February 24, 2021
    Publication date: March 30, 2023
    Inventors: Syed Azhar Hashmi, Prasanna Kumar Pathath, Suman Kumar Jana, Vadlamani Chaitanya, Naveen Sathu, Lee Sangjoo, Debasish Das, Selvakumar Subramanian
  • Process using ion exchange resins for the treatment of wastewater emanating from purified terephthalic acid production
    Patent number: 10919787
    Abstract: A method for recovering water from purified terephthalic acid production wastewater includes: producing purified terephthalic acid comprising purified terephthalic acid feedstock and wastewater comprising impurities; separating the purified terephthalic acid feedstock from the wastewater comprising impurities; transferring the wastewater to a tank; adjusting the p H of the wastewater with a basic solution; adjusting the temperature of the wastewater; passing the wastewater to a column; contacting the wastewater with an ion exchange resin to remove the impurities; and recovering the water depleted of impurities.
    Type: Grant
    Filed: November 8, 2016
    Date of Patent: February 16, 2021
    Assignee: SABIC GLOBAL TECHNOLOGIES B.V.
    Inventors: Roy Van Lier, Syed Azhar Hashmi, Vadlamani Prasad Rao Chaitanya, Sandeep P. Mohandas, Muhammad Mosleh Al-Subhi, Lee Sangjoo, Hasan Mohammed Rashad Haneef
  • PROCESS USING ION EXCHANGE RESINS FOR THE TREATMENT OF WASTEWATER EMANATING FROM PURIFIED TEREPHTHALIC ACID PRODUCTION
    Publication number: 20180346350
    Abstract: A method for recovering water from purified terephthalic acid production wastewater includes: producing purified terephthalic acid comprising purified terephthalic acid feedstock and wastewater comprising impurities; separating the purified terephthalic acid feedstock from the wastewater comprising impurities; transferring the wastewater to a tank; adjusting the p H of the wastewater with a basic solution; adjusting the temperature of the wastewater; passing the wastewater to a column; contacting the wastewater with an ion exchange resin to remove the impurities; and recovering the water depleted of impurities.
    Type: Application
    Filed: November 8, 2016
    Publication date: December 6, 2018
    Inventors: Roy Van Lier, Syed Azhar Hashmi, Vadlamani Prasad Rao Chaitanya, Sandeep P. Mohandas, Muhammad Mosleh Al-Subhi, Lee Sangjoo, Hasan Mohammed Rashad Haneef