Patents by Inventor Tatsumi Ichiki

Tatsumi Ichiki 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).

  • Catalyst for hydrogenating dicarboxylic acids
    Publication number: 20010021781
    Abstract: A catalyst for hydrogenating a dicarboxylic acid, a dicarboxylic acid anhydride, or an ester thereof, said catalyst comprising palladium and rhenium supported on a carrier, characterized in that not more than 20% of analyzed points have an intensity ratio of 2 or larger, wherein a catalyst particle is analyzed by electron probe microscope analysis (EPMA) for rhenium along a longest diameter in a largest cross-section of the catalyst particle, and a rhenium intensity at each analyzed point is divided by an average intensity of all of the analyzed points to give the intensity ration, and that the carrier at least one active carbon selected from the group consisting of coal-based active carbon, coconut-based active carbon and peat-based active carbon.
    Type: Application
    Filed: December 29, 2000
    Publication date: September 13, 2001
    Inventors: Nagato Hamashima, Takeshi Ishihara, Kenji Kobayashi, Tatsumi Ichiki
  • Process for the regeneration of a catalyst
    Patent number: 5854161
    Abstract: A process is provided for the regeneration of a vanadium-phosphorus oxide catalyst which has been used in a process for the preparation of maleic anhydride by oxidizing butane. The used catalyst particles are removed from the fluidized bed reactor and subjected to impact with each other and/or with structural surfaces such that the deteriorated layer is peeled away. Various forms of equipment may be employed such as pneumatic classifiers, jet mills and jetted fluidized beds.
    Type: Grant
    Filed: October 10, 1997
    Date of Patent: December 29, 1998
    Assignees: ABB Lummus Global Inc., Lonza Societa Per Azioni, Tonen Chemical Corporation
    Inventors: Tatsumi Ichiki, Nagato Hamashima, Teiji Nakamura, Masayuki Asami, Sadakatsu Suzuki, Hiroshi Ueno
  • Process for producing 1,4-butanediol and tetrahydrofuran
    Patent number: 5326889
    Abstract: There is disclosed a process for the production of 1,4-butanediol and tetrahydrofuran by the catalytic hydrogenation in the gas phase of .gamma.-butyrolactone using a solid catalyst comprising copper and silicon, copper, chromium, and manganese or copper, chromium, manganese and barium.
    Type: Grant
    Filed: November 4, 1992
    Date of Patent: July 5, 1994
    Assignee: Tonen Corporation
    Inventors: Sadakatsu Suzuki, Tatsumi Ichiki, Hiroshi Ueno
  • Process for the preparation of gamma-butyrolactone
    Patent number: 5210229
    Abstract: Gamma-butyrolactone is prepared by catalytic dehydrogenation of 1,4-butanediol in a gaseous phase in the presence of a catalyst comprising copper, chromium, and manganese and/or barium. Improvement is in that the catalyst further contains sodium and/or potassium, whereby formation of by-products is suppressed and high yield, high selectivity and prolonged catalyst life are attained.
    Type: Grant
    Filed: July 16, 1992
    Date of Patent: May 11, 1993
    Assignee: Tonen Chemical Corporation
    Inventors: Tatsumi Ichiki, Kaori Mori, Sadakatsu Suzuki, Hiroshi Ueno, Kenji Kobayashi
  • Process for producing 1,4-butanediol and tetrahydrofuran
    Patent number: 5099038
    Abstract: There is disclosed a process for the production of 1,4-butanediol and tetrahydrofuran by the catalytic hydrogenation in the gas phase of .gamma.-butyrolactone using a solid catalyst comprising copper and silicon, copper, chromium, and manganese or copper, chromium, manganese and barium.
    Type: Grant
    Filed: November 21, 1990
    Date of Patent: March 24, 1992
    Assignee: Tonen Corporation
    Inventors: Sadakatsu Suzuki, Tatsumi Ichiki, Hiroshi Ueno