Patents by Inventor Junji Endoh

Junji Endoh 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 producing methacrylic acid from isobutylene by two step oxidation
    Patent number: 4124634
    Abstract: In a process for producing methacrylic acid by two step oxidation comprising a first oxidation step of producing methacrolein by reacting isobutylene with molecular oxygen in the presence of a diluent gas and a catalyst, and a second oxidation step of producing methacrylic acid by reacting methacrolein with molecular oxygen in the presence of a diluent gas and a catalyst, the improvement comprises using nitrogen as the diluent gas in the first oxidation step and nitrogen and steam as the diluent gas in the second oxidation step, mixing the reaction products obtained in the first and second oxidation steps, separating and recovering methacrolein and methacrylic acid from the mixture and feeding the recovered methacrolein back into the second oxidation step as a starting material.
    Type: Grant
    Filed: March 8, 1977
    Date of Patent: November 7, 1978
    Assignee: Asahi Glass Company, Ltd.
    Inventors: Isao Gotoh, Junji Endoh, Tohru Ueno