Patents by Inventor Dae C. Park

Dae C. Park 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).

  • Patent number: 5625107
    Abstract: The present invention relates to a new catalyst for converting methane into ethane, preparation thereof, and process for manufacturing ethylene using said catalyst. The conversion reaction catalyst in the present invention is employed in converting directly methane or methane-containing gas in the presence of the above catalyst with the following general formula (1).Ma.Pc.D/S (1)Where,M is a metal cluster or metal complex compound selected from the group of VIII, VII and VI series;S is an inorganic carrier;P is a promoter of phosphorus compound;D is a cobalt compound.And "a" is weight percentage of metal cluster or metal complex compound in catalyst, having a value of 0.01 to 10, "c" is weight percentage of promoter in catalyst, ranging from 1.0 to 35.0.
    Type: Grant
    Filed: August 30, 1995
    Date of Patent: April 29, 1997
    Assignee: Korea Research Institute of Chemical Technology
    Inventors: Dae C. Park, Pyung K. Ahn
  • Patent number: 5371274
    Abstract: The present invention relates to the field of catalyst technology, and more particularly to the preparation of a supported catalyst and a method of producing ethylidene diacetate using that supported catalyst. The catalyst is represented by the formula M.sub.a X. Compound M includes a group VIII transition metal which catalyzes the formation of ethylidene diacetate, preferably a compound of rhodium or palladium. Carrier X is an organic carrier, preferably selected from the divinylbenzene-polystyrene copolymers, most preferably copolymers having about 1-20% crosslinking. The weight percent of metal M contained in the catalyst is represented by the latter a. The supported heterogenized catalyst results from covalent bonding of the transition metal compound to the organic polymer carrier. Ethylidene diacetate was produced by reacting methyl acetate, iodomethane, carbon monoxide and hydrogen in the presence of this supported catalyst and an accelerator at elevated temperature and pressure.
    Type: Grant
    Filed: July 19, 1993
    Date of Patent: December 6, 1994
    Assignee: Korean Research Institute of Chemical Technology
    Inventors: Dae C. Park, Sung Y. Cho, Woo S. Chang
  • Patent number: 5371275
    Abstract: The present invention relates to a process for preparing a catalyst useful in producing ethylidene diacetate and to a process for producing ethylidene diacetate by a continuous process using the catalyst prepared. In the preparation of ethylidene diacetate from carbon monoxide and hydrogen, the conventional preparation method using a homogeneous catalyst system comprising a transition metal catalyst is hampered by difficulty in separating the catalyst from the reaction product after completion of the reaction. The catalyst of the present invention is separated easily from the reaction product. The heterogeneous catalyst of the present invention is prepared by adding a compound of a group VIII metal, preferably rhodium or palladium, to a carrier, preferably .alpha.-alumina, kieselguhr or silica, together with an accelerator containing phosphorus or nitrogen, preferably triphenylphosphine. Using the improved catalyst of the present invention also resulted in increased yield of product over conventional methods.
    Type: Grant
    Filed: July 23, 1993
    Date of Patent: December 6, 1994
    Assignee: Korean Research Institute of Chemical Technology
    Inventors: Dae C. Park, Sung Y. Cho
  • Patent number: 5354886
    Abstract: The present invention relates to a catalyst, a process for preparing the catalyst and a process for using the catalyst to produce ethylidene diacetate. The conventional preparation methods of ethylidene diacetate suffer from difficulty in separating the catalyst from the product after completion of the reaction. The catalyst of the present invention is simply separated from the product by mere filtration following the completion of reaction. This is a result of using a heterogenized catalyst which is obtained by supporting a homogeneous catalyst in an inorganic carder. The catalyst of the present invention is of the general formula M.sub.a X where M is a compound of a group VIII transition metal, most preferably RhCl.sub.3 .multidot.xH.sub.2 O, and X is an inorganic carrier, preferably selected from the group consisting of kieselguhr, .gamma.-alumina, silica, TiO.sub.2, MgO, ZnO and activated charcoal.
    Type: Grant
    Filed: July 26, 1993
    Date of Patent: October 11, 1994
    Assignee: Korea Research Institute of Chemical Technology
    Inventors: Dae C. Park, Sung Y. Cho