Chiyoda Chemical Engineering Construction Co., Ltd.

Kabushiki Kaisha Toshiba

Chiyoda Chemical Engineering & Construction

Masatoshi Matsuda

Munekazu Nakamura

Masayoshi Inooka

Tatsuo Morimoto

Motoyoshi Wakabayashi

Masaaki Kasuya

Toshiji Makabe

Kenji Shimokawa

Osamu Togari

Shigeki Murai

Yoshihiro Ohguchi

Yoshihoro Ohguchi

The brushless motor driver includes a sample and hold circuit which samples and holds a first value of the first comparison signal in a first case in which a current is forced to flow from a first phase coil of the three-phase brushless motor to a second phase coil and no current is forced to flow to a third phase coil in a first period having a preset setting time and a second value of the first comparison signal in a second case in which a current is forced to flow from the second phase coil to the first phase coil and no current is forced to flow to the third phase coil in a second period having the preset setting time subsequent to the first period. The brushless motor driver includes an addition circuit which adds up the first value and the second value sampled and held by the sample and hold circuit and outputs an addition signal depending upon a result of the addition. The brushless motor driver includes a comparison output circuit which compares a value of the addition signal with a reference voltage and outputs a second comparison signal depending upon a result of the comparison. A position of a rotor in the three-phase brushless motor is discriminated on the basis of the second comparison signal.

Brushless motor driver and brushless motor system

A catalyst for hydrocracking heavy hydrocarbon oils includes a porous inorganic carrier composed mainly of alumina or titania, and two or more catalytic metal components composited with the carrier. The metals of the catalytic metal components are either (a) V and at least one element selected from Zn, Fe, Co, Ni, Cu, Ag, Sn and Pb or (b) Mo and at least one element selected from Zn, Cu, Ag, Sn, Pb and the lanthanum-series elements. The catalyst has at least 60% of its total pore volume in pores with a diameter of 200 .ANG. or more, at least 40% of its totalpore volume in pores with a diameter of 300 .ANG. or more and not more than 20% of its total pore volume in pores with a diameter of at least 1000 .ANG.. Disclosed also is a process for hydrocracking a heavy hydrocarbon oil in the presence of the above catalyst.

Process for hydrocracking heavy hydrocarbon oils and catalyst therefor

This invention relates to a catalyst for hydrotreatment of hydrocarbons comprising one or more of metals selected from the group consisting of transition metals and metals of group IIb of the periodic table supported on sepiolite. More particularly it relates to a catalyst effective in the selective demetallization treatment of hydrocarbons.

Catalysts for demetallization treatment of _hydrocarbons supported on

Demetallation of hydrocarbons with catalysts supported on sepiolite

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Yokohama, Japan

Masatoshi Matsuda