Patents by Inventor Jouko Kujala

Jouko Kujala 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 of selective desulfonation
    Patent number: 5741954
    Abstract: This invention relates to a process for the preparation of m-alkylphenols, particularly of 3-ethylphenol, from the mixture of alkylbenzenesulfonic acid isomers by selective desulfonation, removal of formed alkylbenzene and caustic fusion. In the present invention the inventive desulfonation is accomplished by addition of steam to the mixture of sulfonic acid in an excess in relation to the amount of evaporable water, simultaneously maintaining the temperature of the mixture above 160.degree. C. until the desired purity of isomers is obtained, and until the content of the sulfuric acid in the mixture is decreased below 40%.
    Type: Grant
    Filed: July 19, 1995
    Date of Patent: April 21, 1998
    Assignee: Kemira Agro Oy
    Inventors: Elias Suokas, Markku Niemi, Pekka Somersalo, Jouko Kujala