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Duk-Ki
Duk-Ki Kim, Gwangju Metropolitan City KR
| Patent application number | Description | Published |
|---|---|---|
| 20100298601 | Catalyst System, Oxidation Reactor Containing The Same, And Preparation Method For Acrolein And Acrylic Acid Using The Same - The present invention relates to a catalyst system, an oxidation reactor comprising the same, and a method for producing an acrolein and an acrylic acid by using the same. By using the catalyst system according to the present invention, when acrolein and acrylic acid are produced, since heat accumulation in a catalyst layer may be effectively prevented, catalyst deterioration may be prevented, and the catalyst may be stably used for a long period of time. In addition, an acrolein and an acrylic acid may be produced at high selectivity and high yield. | 11-25-2010 |
Duk-Ki Kim, Gwangju KR
| Patent application number | Description | Published |
|---|---|---|
| 20090247787 | METHOD OF PRODUCING UNSATURATED ALDEHYDE AND/OR UNSATURATED ACID - Disclosed is a shell-and-tube reactor that may be used for fixed-bed catalytic partial oxidation, the reactor being characterized by including at least one reaction zone of a first-step reaction zone for mainly producing unsaturated aldehydes and a second-step reaction zone for mainly producing unsaturated acids, wherein at least one reaction zone of the above reaction zones comprises two or more catalytic layers; each of the catalytic layers is packed with a formed product of catalyst that is different in pore density and/or pore size in a catalytically active component; and the pore density and/or pore size is controlled in such a manner that specific surface area of the catalytically active component increases from the inlet of the reactor to the outlet of the reactor. A method for producing unsaturated aldehydes and/or unsaturated fatty acids from olefins using the same reactor is also disclosed. According to the present invention, it is possible to control the temperature efficiently at a hot spot, thereby permitting stable use of a catalyst, and to produce unsaturated aldehydes and/or unsaturated fatty acids with high yield. | 10-01-2009 |
| 20100184591 | METHOD OF PREPARING HETEROPOLY ACID CATALYST - The present invention relates to a method of preparing a heteropoly acid catalyst used for the production of methacrylic acid by gas phase oxidation of methacrolein, more precisely a method of preparing a heteropoly acid catalyst comprising the steps of preparing a slurry by adding metal precursors and ammonium salt to protonic acid Keggin-type heteropoly acid aqueous solution and stirring thereof; and drying, molding and firing the slurry to give a catalyst. The present invention provides a method of preparing a heteropoly acid catalyst exhibiting high methacrolein conversion rate and methacrylic acid selectivity without pre-firing process by using high purity protonic acid Keggin-type heteropoly acid and ammonium salt. | 07-22-2010 |
Duk-Ki Moon, Gimhae-Si KR
| Patent application number | Description | Published |
|---|---|---|
| 20090236808 | APPARATUS FOR OPERATING ROLLER IMBEDDED IN A SHOE UP AND DOWN - An apparatus for operating a roller up and down is provided, which includes a main body fixed to a bottom of a shoe, an operating body to which the roller is imbedded, which is slidably mounted within the main body, and an operating assembly to move the operating body within the main body between an operating position and a non-operating position, wherein the roller protrudes out from the main body in the operating position while the roller is retracted into the main body in the non-operating position. A wearer of a shoe is capable of shifting the shoe between an operating position in which the roller protrudes out from the bottom of the shoe and a non-operating position in which the roller is retracted into the bottom of the shoe, by a simple operation. Accordingly, the shoe can be used as a roller shoe when the roller is in the operating position, and used as a general walking shoe for everyday use when the roller is in the non-operating position. As a result, the wearer can conveniently use a roller shoe as well as a walking shoe with one shoe. | 09-24-2009 |