Patents by Inventor HyoJin GWAK

HyoJin GWAK 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).

  • Recovery method of highly pure lactic acid and alkyl lactate
    Patent number: 9012685
    Abstract: A method for recovery of highly pure alkyl lactate and lactic acid is provided, which includes a step 1 for producing source liquid comprising lactic acid or ammonium lactate; a step 2 for dehydrating the source liquid product of step 1; a step 3 for producing liquid mixture by sequentially adding and stirring alcohol and acid solution to the dehydrated source liquid; a step 4 for separating and removing ammonium salt precipitation from the liquid mixture of step 3; a step 5 for producing alkyl lactate from ammonium salt-free liquid mixture by esterification reaction; and a step 6 for separating alcohol and alkyl lactate by distillation from the mixture of step 5.
    Type: Grant
    Filed: December 2, 2011
    Date of Patent: April 21, 2015
    Assignee: Korea Research Institute of Chemical Technology
    Inventors: Dong Won Hwang, Jong-San Chang, Young Kyu Hwang, U-Hwang Lee, HyoJin Gwak
  • RECOVERY METHOD OF HIGHLY PURE LACTIC ACID AND ALKYL LACTATE
    Publication number: 20120142945
    Abstract: A method for recovery of highly pure alkyl lactate and lactic acid is provided, which includes a step 1 for producing source liquid comprising lactic acid or ammonium lactate; a step 2 for dehydrating the source liquid product of step 1; a step 3 for producing liquid mixture by sequentially adding and stirring alcohol and acid solution to the dehydrated source liquid; a step 4 for separating and removing ammonium salt precipitation from the liquid mixture of step 3; a step 5 for producing alkyl lactate from ammonium salt-free liquid mixture by esterification reaction; and a step 6 for separating alcohol and alkyl lactate by distillation from the mixture of step 5.
    Type: Application
    Filed: December 2, 2011
    Publication date: June 7, 2012
    Applicant: KOREA RESEARCH INSTITUTE OF CHEMICAL TECHNOLOGY
    Inventors: Dong Won HWANG, Jong-San CHANG, Young Kyu HWANG, U-Hwang LEE, HyoJin GWAK