Patents by Inventor Seok Hyeon Cheong

Seok Hyeon Cheong 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).

  • Methods for producing a methanol precursor, methanol, and a methyl ester from methane in high purities
    Patent number: 11021429
    Abstract: A method for producing a methanol precursor, methyl trifluoroacetate, having high-purity includes the steps of (a) preparing methyl bisulfate by mixing a catalyst with an acid solution comprising a sulfur-containing acid to provide a first mixture and supplying methane gas to the first mixture to prepare the methyl bisulfate; and (b) preparing methyl trifluoroacetate (CF3CO2CH3) by adding trifluoroacetic acid (CF3CO2H) to the first mixture including the methyl bisulfate to provide a second mixture and distilling the second mixture under heating to prepare, separate and purify the methyl trifluoroacetate (CF3CO2CH3). Methanol may be produced by adding water to the methyl trifluoroacetate (CF3CO2CH3). A methyl ester represented by Formula 2 below may be produced by adding a carboxylic acid represented by Formula 1 below to the methyl trifluoroacetate (CF3CO2CH3): R1CO2H??(1), where R1 is selected from C1-C10 alkyl groups, R1CO2CH3??(2), where R1 is as defined in Formula 1.
    Type: Grant
    Filed: July 30, 2020
    Date of Patent: June 1, 2021
    Assignee: Korea Institute of Science and Technology
    Inventors: Hyun Joo Lee, Ung Lee, He Won Lee, Tran Huyen Dang, Seok Hyeon Cheong