Japan Energy Corporation

Toru Saito

Chikanori Nakaoka

Hiroki Koyama

Katsuaki Ishida

Manabu Kobayashi

Yoshiki Iwata

Yoshikazu Kumahara

Hideaki Kumagai

Katsuya Kuboyama

Kaori Matsuzawa

A heavy oil is hydrorefined using a hydrorefining catalyst. A spent hydrorefining catalyst whose activity has decreased is heat treated (S) and pulverized to obtained a regenerated powder (S). This regenerated powder is fractionated according to its metal content (S), formed (S), dried (S), and calcined (S) to manufacture a regenerated catalyst whose volume of pores with a diameter of 50 to 2000 nm is at least 0.2 ml/g, and whose volume of pores with a diameter over 2000 nm is no more than 0.1 mL/g. Using this regenerated catalyst, a heavy oil containing at least 45 wt ppm vanadium and nickel as combined metal elements is hydrodemetalized, and the vanadium and nickel are recovered from the used regenerated catalyst (SS). Through hydrorefining, the metal components are recovered more efficiently, and the spent catalyst can be reused to manufacture a regenerated catalyst that exhibits high reaction, activity.

Method for manufacturing hydrorefining catalyst, and metal recovery method

A method for producing a hydrorefining catalyst is used to produce the hydrorefining catalyst which contains an inorganic oxide carrier and a hydrogenation-active metal and which has such a bimodal pore characteristic that pores having pore diameters of not more than 50 nm have a pore volume of not less than 0.4 cm/g, pores having pore diameters of not less than 50 nm have a pore volume of not less than 0.2 cm/g, and pores having pore diameters of not less than 1000 nm have a pore volume of not more than 0.1 cm/g. The method comprises the steps of mixing and forming a pseudo-boehmite powder having a dispersibility index of 0.13 to 0.28, and calcinating the formed pseudo-boehmite under a condition in which the pseudo-boehmite is converted into &#x3b3;-alumina. The hydrorefining catalyst, which has the bimodal pore characteristic, can be produced easily at low cost.

Method for preparing hydrogenation purification catalyst

A hydrorefining catalyst of a hydrogenation active metal component supported on a refractory porous carrier has a median pore diameter determined by the nitrogen adsorption method of 8 to 20 nm, a pore volume determined by the nitrogen adsorption method of 0.56 cm /g or greater, and a pore volume of pores with a pore diameter of 50 nm or larger determined by the mercury intrusion porosimetry method of 0.32 cm /g or greater. Both the demetallizing activity and metal deposition capacity of the catalyst in hydrogenation and demetallizing of heavy oil are high. The hydrorefining catalyst is obtained by kneading a porous starting powder principally composed of &ggr;-alumina and having a pore capacity of 0.75 m /g or larger and a mean pore diameter of 10 to 200 &mgr;m, molding and calcining, and supporting an active metal component on the product.

Catalyst for hydrofining and method for preparation thereof

A hydrocracking catalyst has a carrier that has particles of a compound oxide and a binder present between these particles, and at least one metal component selected from Group 6, Group 9 or Group 10 of the Periodic Table supported on the carrier. The catalyst has a median pore diameter of 40 to 100 &angst; and the volume of pores whose pore diameter falls within a range of 40 to 100 &angst; is at least 0.1 mL/g. Moreover, the volume of pores of the catalyst whose pore diameter falls within a range of 0.05 to 5 &mgr;m is 0.05 to 0.5 mL/g, and the volume of pores whose pore diameter is 0.5 to 10 &mgr;m is less than 0.05 mL/g. This catalyst is mechanically strong enough for practical use and has a high conversion rate and middle distillate selectivity in hydrocracking of hydrocarbon oils, particularly vacuum gas oil.

Hydrocracking catalyst, producing method thereof, and hydrocracking method

The present invention provides an ITO sputtering target and a method of cleaning the target. ITO ground powder which is deposited on a surface of the target requires removal to increase the cleanness of the target surface. This prevents the production of nodules caused by sputtering in order to restrain abnormal discharge and prevent the production of particles. Particles deposited on a sputtered surface of an ITO sintered target are removed by subjecting the sputtered surface to multiple-oscillation ultrasonic washing, or alternatively, by sticking an adhesive tape to the sputtered surface, sufficiently rubbing the tape against the surface, and then peeling the tape off the surface. Both methods result in 400 or fewer deposited particles of 0.2 .mu.m or more average particle diameter being present in a 100 .mu.m.times.100 .mu.m area of the sputtered surface.

Growing community of inventors

Toda, Japan

Toru Saito