Patents by Inventor Cornelis B. De Gruijter

Cornelis B. De Gruijter 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 separating dimethylnaphthalene isomers with zeolite L agglomerates
    Patent number: 5146040
    Abstract: Zeolite L in very small crystalline form is prepared by a process in which an alkaline reaction mixture comprising water, a source of silicon (SiO.sub.2), a source of alkali metal (M) (KOH) and a source of aluminium (Al.sub.2 O.sub.3.3H.sub.2 O) or gallium is heated to a temperature of at least 80.degree. C. for a period of time long enough to form zeolite L, the composition of the reaction mixture having the following molar ratios (expressed as oxides):______________________________________ M.sub.2 O/SiO.sub.2 0.4 to 0.5 H.sub.2 O/M.sub.2 O 15 to 30 and SiO.sub.2 /Al.sub.2 O.sub.3 or Ga.sub.2 O.sub.3 5 to 11 ______________________________________where M is potassium or a mixture of potassium and one or more other alkali metals. Zeolite L made by this process can be used for separating isomers of dimethylnaphthalene from one another.
    Type: Grant
    Filed: May 10, 1991
    Date of Patent: September 8, 1992
    Assignee: Exxon Chemical Patents Inc.
    Inventors: Johannes P. Verduijn, Mechilium J. G. Janssen, Cornelis B. De Gruijter, Wicher T. Koetsier, Cornelis W. M. Van Oorschot
  • Zeolite L preparation
    Patent number: 5064630
    Abstract: Zeolite L in very small crystalline form is prepared by a process in which an alkaline reaction mixture comprising water, a source of silicon (SiO.sub.2), a source of alkali metal (M) (KOH) and a source of aluminium (Al.sub.2 O.sub.3.3H.sub.2 O) or gallium is heated to a temperature of at least 80.degree. C. for a period of time long enough to form zeolite L, the composition of the reaction mixture having the following molar ratios (expressed as oxides):______________________________________ M.sub.2 O/SiO.sub.2 0.4 to 0.5 H.sub.2 O/M.sub.2 O 15 to 30 and SiO.sub.2 /Al.sub.2 O.sub.3 or Ga.sub.2 O.sub.3 5 to 11 ______________________________________where M is potassium or a mixture of potassium and one or more other alkali metals.
    Type: Grant
    Filed: January 3, 1989
    Date of Patent: November 12, 1991
    Assignee: Exxon Chemical Patents Inc.
    Inventors: Johannes P. Verduijn, Mechilium Janssen, Cornelis B. De Gruijter, Wicher T. Koetsier, Cornelis W. M. Van Oorschot