Patents by Inventor JOHN ENHOFFER

JOHN ENHOFFER 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).

  • Process for hydrogen sulfide scrubbing and method for ferric ion regeneration
    Patent number: 11198828
    Abstract: A process and method for removing hydrogen sulfide from a gas and regenerating ferric ions consumed in the hydrogen sulfide scrubbing process at low pH. A two-scrubber regenerative chemical scrubbing system for removing hydrogen sulfide from a gas that provides an economical system for removing hydrogen sulfide from a gas at low pH without the need for chelating agents. An oxide of manganese is used as a catalyst to enhance the regeneration of ferric ions in an aqueous solution under acidic conditions in the presence of oxygen. The process may further include contacting the aqueous solution with a second gas comprising air to replenish the dissolved oxygen in the aqueous solution. The regenerated solution comprising ferric ions can be reused to treat additional hydrogen sulfide containing gases.
    Type: Grant
    Filed: March 27, 2019
    Date of Patent: December 14, 2021
    Assignees: BIONOMIC INDUSTRIES INC., UNIVERSITY OF MASSACHUSETTS
    Inventors: Chen-Lu Yang, Kumari I. Kaushik, John Enhoffer
  • PROCESS FOR HYDROGEN SULFIDE SCRUBBING AND METHOD FOR FERRIC ION REGENERATION
    Publication number: 20210009913
    Abstract: A process and method for removing hydrogen sulfide from a gas and regenerating ferric ions consumed in the hydrogen sulfide scrubbing process at low pH. A two-scrubber regenerative chemical scrubbing system for removing hydrogen sulfide from a gas that provides an economical system for removing hydrogen sulfide from a gas at low pH without the need for chelating agents. An oxide of manganese is used as a catalyst to enhance the regeneration of ferric ions in an aqueous solution under acidic conditions in the presence of oxygen. The process may further include contacting the aqueous solution with a second gas comprising air to replenish the dissolved oxygen in the aqueous solution. The regenerated solution comprising ferric ions can be reused to treat additional hydrogen sulfide containing gases.
    Type: Application
    Filed: March 27, 2019
    Publication date: January 14, 2021
    Inventors: CHEN-LU YANG, KUMARI I. KAUSHIK, JOHN ENHOFFER